CN109707362B - Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir - Google Patents
Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir Download PDFInfo
- Publication number
- CN109707362B CN109707362B CN201910068976.5A CN201910068976A CN109707362B CN 109707362 B CN109707362 B CN 109707362B CN 201910068976 A CN201910068976 A CN 201910068976A CN 109707362 B CN109707362 B CN 109707362B
- Authority
- CN
- China
- Prior art keywords
- fracturing
- sand body
- reservoir
- residual oil
- old well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps: step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir; step 2) establishing a stress profile model of an old well reservoir, and determining the position and the number of layers of single sand body fixed-point fracturing; step 3) simulating the fracture form, determining the fracture parameters and the fracture arrangement direction, and determining the nozzle position and the nozzle number of the directional hydraulic jet fracturing drilling tool; step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation; step 5), a directional hydraulic jet fracturing drilling tool is put in, and the directional hydraulic jet fracturing drilling tool is butted with the positioning support device; step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil; and 7) sequentially completing the fracturing operation of the residual single sand body.
Description
Technical Field
The invention belongs to the technical field of fracturing of oil extraction engineering, and particularly relates to a fixed-point fracturing method for residual oil in a longitudinal single sand body of a reservoir of an excavating and submerging old well.
Background
The fracturing is an important way for modifying a reservoir of a low-permeability oil and gas reservoir and realizing benefit development, and the temporary plugging and steering fracturing technology can plug an original crack, realize crack steering and form a new crack, so that a complex crack network system is formed, the drainage area of a gas well is increased, and the purpose of increasing the yield of the gas well is realized.
The three-fold system reservoir of the Ordos basin belongs to a typical low-permeability, low-pressure and low-abundance oil reservoir, and in order to realize the effective development of the oil reservoir, the exploitation is generally carried out by adopting the modes of water injection, fracturing modification and the like. Taking a typical long X oil reservoir of an Ansai oil field as an example, the single-well yield can reach more than 3t/d after water injection and fracturing transformation at the initial production stage, but the oil reservoir production degree is continuously improved and the water content gradually rises along with the extension of the exploitation time, so that the single-well yield is continuously reduced. At present, the oil reservoir enters a medium-high water content development stage after water injection development for nearly 30 years, and the average single-well yield is reduced to below 1.0t/d, so that repeated reconstruction of an old well is urgently needed, residual oil in a submerged reservoir is excavated, and the single-well yield is improved.
In order to fully excavate the residual oil in the old oil field, the long X layer is further subdivided into 3-4 single sand bodies with the thickness of about 3-5 m by inspection well data and field outcrop comparison research and combining logging analysis. Tests and core analysis of the encryption well show that residual oil in a longitudinal single sand body of a reservoir is enriched, partial production fracturing transformation is not fully used, and the potential for excavation is realized.
Because the single sand body is thin, the interlayer does not develop longitudinally, and the stress difference of the storage interlayer is less than 2MPa, the conventional fracturing transformation is easy to cause the height of a crack to be out of control, and the layer jump phenomenon occurs in the fracturing process; meanwhile, the old oil field is subjected to water injection for many years, the oil-water relationship is complex, the purpose of directionally excavating and submerging residual oil is difficult to realize by conventional fracturing transformation, the water content is easy to rise after the fracturing, and the repeated transformation effect is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a fixed-point fracturing method for residual oil in a longitudinal single sand body of a mining and submerging old well reservoir, and overcomes the defects of the prior art that 1: conventional fracturing transformation easily causes crack joint height out of control, and the phenomenon of scurrying takes place among the fracturing process, 2: conventional fracturing transformation is difficult to realize the purpose of digging residual oil in a fixed direction, water content after the fracturing is easy to rise, and repeated transformation effect is influenced, 3: the prior art has no problems about repeated old well reconstruction, a method for submerging residual oil in a reservoir stratum and the like.
In order to solve the technical problem, the technical scheme of the invention is as follows: a fixed point fracturing method for residual oil in a single longitudinal sand body of a mining and submerging old well reservoir comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the layer number determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the directional hydraulic jet fracturing drilling tool;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Preferably, the determination of the distribution position and the orientation of the residual oil in the longitudinal single sand body of the old well reservoir in the step 1) is based on reservoir development geological dynamic analysis and a pulse neutron saturation logging method, and the determination of the enrichment position and the orientation of the residual oil in the reservoir is carried out according to the analysis and monitoring results.
Preferably, in the step 2), the old well reservoir stress is calculated according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, and an old well reservoir stress profile model is established, wherein the old well reservoir stress profile model has the following formula:
in the formula:
νp、νs: longitudinal and transverse wave speeds, m/s;
Ed: dynamic Young's modulus, MPa;
Vd: dynamic poisson ratio, no dimensional quantity;
wherein the horizontal minimum principal stress after long-term injection and production is as follows:
in the formula:
σh: horizontal minimum principal stress, MPa;
σv: vertical stress, MPa;
Εh: horizontal dynamic young's modulus, MPa;
Ev: vertical dynamic Young's modulus, MPa;
Vh: horizontal dynamic poisson ratio, no dimension;
VV: vertical dynamic Poisson's ratio, no dimensional quantity;
αh: horizontal biot elastic coefficient, dimensionless;
αv: vertical biot elastic coefficient, no dimensional quantity;
p: reservoir pore pressure, MPa.
Preferably, according to a stress profile model of an old well reservoir, combining the distribution position of the residual oil of the longitudinal single sand body of the old well reservoir, aiming at different jetting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the residual oil of the longitudinal single sand body of the old well reservoir, simulating and calculating by adopting Fracpro PT fracturing software, determining the position of fixed point fracturing and the number of layers of the single sand body, and when the stress difference value of a small longitudinal interlayer of the reservoir is less than 2MPa, adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil.
Preferably, in the step 3), according to the determined single sand body fixed point fracturing position and the determined number of layers, Fracpro PT fracturing software is adopted to simulate the fixed point fracturing fracture morphology, determine the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, calculate the nozzle throttling pressure difference and the nozzle spraying speed according to the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, and determine the nozzle position and the nozzle number of the directional hydraulic jet fracturing drilling tool.
Preferably, the specific operation steps of step 4) are as follows: the cable is used for carrying a magnetic locator, a dispenser and a locating and supporting device to enter a well, the dispensing position of the locating and supporting device is determined according to the depth of a casing coupling measured by the magnetic locator, gunpowder of the magnetic locator is ignited and detonated, a hydraulic cylinder of the magnetic locator is pushed to seat slips on the inner wall of the casing, and the dispenser is lifted out; and then, a cable is adopted to carry the gyroscope to go down the well, the guide groove of the gyroscope is butted with the orientation key on the positioning and supporting device, the orientation of the orientation key of the positioning and supporting device is measured, and the cable is lifted up to be lifted out of the gyroscope.
Preferably, the orientation key is a cuboid, the length of the orientation key is 50mm, the width of the orientation key is 10mm, and the height of the orientation key is 5 mm.
Preferably, in the step 5), the positions of a hydraulic ejector nozzle and a positioning guider guide groove in the directional hydraulic jet fracturing drilling tool are adjusted according to the direction and the direction obtained in the step 4), then the directional hydraulic jet fracturing drilling tool is put in, the drilling speed is reduced at a position 10m away from the upper part of the positioning support device, the surface hanging weight of the pressure gauge of the derrick is observed, the oil pipe is rotated according to the change of the hanging weight until the guide groove of the positioning guider at the lower part of the directional hydraulic jet fracturing drilling tool is accurately butted with a positioning key on the positioning support device, the surface hanging weight of the pressure gauge of the derrick is reduced to 0, and the directional hydraulic jet fracturing drilling tool is put in the designed position.
Preferably, the hydraulic ejector is a single-side ejector or a double-side ejector with 180 degrees of phase, wherein the nozzles of the double-side ejector are evenly distributed on two sides of the double-side ejector, the length of the hydraulic ejector body is 380mm, the outer diameter is 100mm, the inner diameter is 40mm, and the diameter of the nozzle is 6.3 mm.
Compared with the prior art, the invention has the advantages that:
(1) aiming at the middle and later stages of the development of low-permeability and high-water-content oil reservoirs, the overall oil-water relationship of the oil reservoirs is complex, in order to accurately excavate the residual oil of the longitudinal single sand body of the submerged oil reservoir and prevent the water content of the oil well from rising after pressing, a fixed-position hydraulic jet fracturing method with fixed position is utilized, the fixed-position fracturing operation of the fracturing integration is realized, the construction efficiency is improved, the fixed-position initiation of cracks is realized according to the residual oil distribution relationship, the azimuth of a waterline test and other data, the crack height is controlled, the residual oil of the longitudinal single sand body of the submerged oil reservoir is excavated, the water breakthrough of the oil well after pressing is avoided, and the oil reservoir has wide application prospect;
(2) the invention has the characteristics of low construction cost, simple site construction, reliable plugging, obvious effect after pressing and high controllability.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other embodiments disclosed herein are illustrative only and are not intended to limit the scope of the invention, which is defined by the claims, since the scope of the invention is not limited by the specific structures, proportions, and dimensions, or otherwise, unless otherwise specified, since various modifications, changes in the proportions and variations thereof, can be made by those skilled in the art without departing from the spirit and scope of the invention.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The positioning and supporting device, the gyroscope, the directional hydraulic jet fracturing drilling tool, the hydraulic ejector, the magnetic positioner and the dispenser are all in the prior art.
The reservoir development geological dynamic analysis, the pulse neutron saturation logging method, the reservoir logging data, the residual oil test result, the water injection line analysis data, the reservoir longitudinal wave data, the reservoir transverse wave data and the Fracpro PT fracturing software are all the prior art.
The directional hydraulic jet fracturing drilling tool comprises a directional guider (with a guide groove), a K344-112 packer, a check valve, a hydraulic ejector, a hydraulic safety joint and a hydraulic pressure joint 27/8"The connection position relation of the external thickened oil pipe to the wellhead is the common connection position relation in the prior art, and the invention is not repeated.
Example 1
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the number of layers determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the hydraulic ejector;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Example 2
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the number of layers determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the hydraulic ejector;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Preferably, the determination of the distribution position and the orientation of the residual oil in the longitudinal single sand body of the old well reservoir in the step 1) is based on reservoir development geological dynamic analysis and a pulse neutron saturation logging method, and the determination of the enrichment position and the orientation of the residual oil in the reservoir is carried out according to the analysis and monitoring results.
Example 3
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the number of layers determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the hydraulic ejector;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Preferably, the determination of the distribution position and the orientation of the residual oil in the longitudinal single sand body of the old well reservoir in the step 1) is based on reservoir development geological dynamic analysis and a pulse neutron saturation logging method, and the determination of the enrichment position and the orientation of the residual oil in the reservoir is carried out according to the analysis and monitoring results.
Preferably, in the step 2), the old well reservoir stress is calculated according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, and an old well reservoir stress profile model is established, wherein the old well reservoir stress profile model has the following formula:
in the formula:
νp、νs: longitudinal and transverse wave speeds, m/s;
Ed: dynamic Young's modulus, MPa;
Vd: dynamic poisson ratio, no dimensional quantity;
wherein the horizontal minimum principal stress after long-term injection and production is as follows:
in the formula:
σh: horizontal minimum principal stress, MPa;
σv: vertical stress, MPa;
Εh: horizontal dynamic young's modulus, MPa;
Ev: vertical dynamic Young's modulus, MPa;
Vh: horizontal dynamic poisson ratio, no dimension;
VV: vertical dynamic Poisson's ratio, no dimensional quantity;
αh: horizontal biot elastic coefficient, dimensionless;
αv: vertical biotElastic coefficient, no dimensional;
p: reservoir pore pressure, MPa.
Preferably, according to a stress profile model of an old well reservoir, combining the distribution position of the residual oil of the longitudinal single sand body of the old well reservoir, aiming at different jetting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the residual oil of the longitudinal single sand body of the old well reservoir, simulating and calculating by adopting Fracpro PT fracturing software, determining the position of fixed point fracturing and the number of layers of the single sand body, and when the stress difference value of a small longitudinal interlayer of the reservoir is less than 2MPa, adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil.
Preferably, in the step 3), according to the determined single sand body fixed point fracturing position and the determined number of layers, Fracpro PT fracturing software is adopted to simulate the fixed point fracturing fracture morphology, determine the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, calculate the nozzle throttling pressure difference and the nozzle spraying speed according to the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, and determine the nozzle position and the nozzle number of the hydraulic ejector.
The hydraulic ejector is a single-side ejector or a double-side ejector with the phase of 180 degrees, nozzles of the double-side ejector are evenly distributed on two sides of the double-side ejector, the length of the hydraulic ejector body is 380mm, the outer diameter is 100mm, the inner diameter is 40mm, and the diameter of each nozzle is 6.3 mm.
Example 4
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the number of layers determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the hydraulic ejector;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Preferably, the determination of the distribution position and the orientation of the residual oil in the longitudinal single sand body of the old well reservoir in the step 1) is based on reservoir development geological dynamic analysis and a pulse neutron saturation logging method, and the determination of the enrichment position and the orientation of the residual oil in the reservoir is carried out according to the analysis and monitoring results.
Preferably, in the step 2), the old well reservoir stress is calculated according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, and an old well reservoir stress profile model is established, wherein the old well reservoir stress profile model has the following formula:
in the formula:
νp、νs: longitudinal and transverse wave speeds, m/s;
Ed: dynamic Young's modulus, MPa;
Vd: dynamic poisson ratio, no dimensional quantity;
wherein the horizontal minimum principal stress after long-term injection and production is as follows:
in the formula:
σh: horizontal minimum principal stress, MPa;
σv: vertical stress, MPa;
Εh: horizontal dynamic young's modulus, MPa;
Ev: vertical dynamic Young's modulus, MPa;
Vh: horizontal dynamic poisson ratio, no dimension;
VV: vertical dynamic Poisson's ratio, no dimensional quantity;
αh: horizontal biot elastic coefficient, dimensionless;
αv: vertical biot elastic coefficient, no dimensional quantity;
p: reservoir pore pressure, MPa.
Preferably, according to a stress profile model of an old well reservoir, combining the distribution position of the residual oil of the longitudinal single sand body of the old well reservoir, aiming at different jetting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the residual oil of the longitudinal single sand body of the old well reservoir, simulating and calculating by adopting Fracpro PT fracturing software, determining the position of fixed point fracturing and the number of layers of the single sand body, and when the stress difference value of a small longitudinal interlayer of the reservoir is less than 2MPa, adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil.
Preferably, in the step 3), according to the determined single sand body fixed point fracturing position and the determined number of layers, Fracpro PT fracturing software is adopted to simulate the fixed point fracturing fracture morphology, determine the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, calculate the nozzle throttling pressure difference and the nozzle spraying speed according to the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, and determine the nozzle position and the nozzle number of the hydraulic ejector.
The hydraulic ejector is a single-side ejector or a double-side ejector with the phase of 180 degrees, nozzles of the double-side ejector are evenly distributed on two sides of the double-side ejector, the length of the hydraulic ejector body is 380mm, the outer diameter is 100mm, the inner diameter is 40mm, and the diameter of each nozzle is 6.3 mm.
Preferably, the specific operation steps of step 4) are as follows: the cable is used for carrying a magnetic locator, a dispenser and a locating and supporting device to enter a well, the dispensing position of the locating and supporting device is determined according to the depth of a casing coupling measured by the magnetic locator, gunpowder of the magnetic locator is ignited and detonated, a hydraulic cylinder of the magnetic locator is pushed to seat slips on the inner wall of the casing, and the dispenser is lifted out; and then, a cable is adopted to carry the gyroscope to go down the well, the guide groove of the gyroscope is butted with the orientation key on the positioning and supporting device, the orientation of the orientation key of the positioning and supporting device is measured, and the cable is lifted up to be lifted out of the gyroscope.
Preferably, the orientation key is a cuboid, the length of the orientation key is 50mm, the width of the orientation key is 10mm, and the height of the orientation key is 5 mm.
Example 5
The invention discloses a fixed-point fracturing method for residual oil in a longitudinal single sand body of an excavation and submergence old well reservoir, which comprises the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the number of layers determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the hydraulic ejector;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
Preferably, the determination of the distribution position and the orientation of the residual oil in the longitudinal single sand body of the old well reservoir in the step 1) is based on reservoir development geological dynamic analysis and a pulse neutron saturation logging method, and the determination of the enrichment position and the orientation of the residual oil in the reservoir is carried out according to the analysis and monitoring results.
Preferably, in the step 2), the old well reservoir stress is calculated according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, and an old well reservoir stress profile model is established, wherein the old well reservoir stress profile model has the following formula:
in the formula:
νp、νs: longitudinal and transverse wave speeds, m/s;
Ed: dynamic Young's modulus, MPa;
Vd: dynamic poisson ratio, no dimensional quantity;
wherein the horizontal minimum principal stress after long-term injection and production is as follows:
in the formula:
σh: horizontal minimum principal stress, MPa;
σv: vertical stress, MPa;
Εh: horizontal dynamic young's modulus, MPa;
Ev: vertical dynamic Young's modulus, MPa;
Vh: horizontal dynamic poisson ratio, no dimension;
VV: vertical dynamic Poisson's ratio, no dimensional quantity;
αh: horizontal biot elastic coefficient, dimensionless;
αv: vertical biot elastic coefficient, no dimensional quantity;
p: reservoir pore pressure, MPa.
The reservoir pore pressure P in the formula can be usually obtained through field test, and the rock Poisson ratio and the Biott coefficient can be obtained through indoor rock core test, so that a reservoir pressure test result is integrated, and a reservoir longitudinal ground stress calculation model under the long-term injection and production influence condition can be calculated through indoor rock mechanical parameters under the influence of reservoir heterogeneity and various heterogeneity.
Preferably, according to a stress profile model of an old well reservoir, combining the distribution position of the residual oil of the longitudinal single sand body of the old well reservoir, aiming at different jetting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the residual oil of the longitudinal single sand body of the old well reservoir, simulating and calculating by adopting Fracpro PT fracturing software, determining the position of fixed point fracturing and the number of layers of the single sand body, and when the stress difference value of a small longitudinal interlayer of the reservoir is less than 2MPa, adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil.
Preferably, in the step 3), according to the determined single sand body fixed point fracturing position and the determined number of layers, Fracpro PT fracturing software is adopted to simulate the fixed point fracturing fracture morphology, determine the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, calculate the nozzle throttling pressure difference and the nozzle spraying speed according to the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed point fracturing, and determine the nozzle position and the nozzle number of the hydraulic ejector.
The hydraulic ejector is a single-side ejector or a double-side ejector with 180-degree phase, nozzles of the double-side ejector are evenly distributed on two sides of the double-side ejector, the length of a hydraulic ejector body is 380mm, the outer diameter is 100mm, the inner diameter is 40mm, the diameter of each nozzle is 6.3mm, single-wing fracture fracturing or double-wing symmetric fracture fracturing can be performed on a reservoir stratum, and the hydraulic ejector can meet the requirement of being capable of plugging a jet hole on one side according to the distribution of residual oil and the water-meeting direction.
Preferably, the specific operation steps of step 4) are as follows: the cable is used for carrying a magnetic locator, a dispenser and a locating and supporting device to enter a well, the dispensing position of the locating and supporting device is determined according to the depth of a casing coupling measured by the magnetic locator, gunpowder of the magnetic locator is ignited and detonated, a hydraulic cylinder of the magnetic locator is pushed to seat slips on the inner wall of the casing, and the dispenser is lifted out; and then, a cable is adopted to carry the gyroscope to go down the well, the guide groove of the gyroscope is butted with the orientation key on the positioning and supporting device, the orientation of the orientation key of the positioning and supporting device is measured, and the cable is lifted up to be lifted out of the gyroscope.
Preferably, the orientation key is a cuboid, the length of the orientation key is 50mm, the width of the orientation key is 10mm, and the height of the orientation key is 5 mm.
Preferably, in the step 5), the positions of a hydraulic ejector nozzle and a positioning guider guide groove in the directional hydraulic jet fracturing drilling tool are adjusted according to the direction and the direction obtained in the step 4), then the directional hydraulic jet fracturing drilling tool is put in, the drilling speed is reduced at a position 10m away from the upper part of the positioning support device, the surface hanging weight of the pressure gauge of the derrick is observed, the oil pipe is rotated according to the change of the hanging weight until the guide groove of the positioning guider at the lower part of the directional hydraulic jet fracturing drilling tool is accurately butted with a positioning key on the positioning support device, the surface hanging weight of the pressure gauge of the derrick is reduced to 0, and the directional hydraulic jet fracturing drilling tool is put in the designed position.
Example 6
Step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir according to the geological dynamic analysis of reservoir development and a pulse neutron saturation logging method, selecting a long X compact reservoir in an Eldos basin to carry out a 2-well field test, and producing 1.41m of liquid in the day before fracturing3D, 0.6t/d of daily oil production and 49.6 percent of water;
step 2) designing and establishing a stress profile model (such as the model) of the old well reservoir according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, obtaining that the stress difference value between small longitudinal interlayers of the reservoir is less than 2MPa, and adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil; according to a stress profile model of an old well reservoir, combining the distribution position of the longitudinal single sand body residual oil of the old well reservoir, aiming at different shooting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the longitudinal single sand body residual oil of the old well reservoir, performing simulation calculation by adopting Fracpro PT fracturing software, and determining that the position of fixed-point fracturing is 40 meters underground and the number of single sand body layers is 4;
step 3) adopting Fracpro PT fracturing software to simulate the fracture morphology of the fixed point fracturing, and determining that the discharge capacity of the fixed point fracturing is 4.0m3Min, sand addition 18m3Liquid amount of 56m3Calculating the throttling pressure difference of 9-11 MPa and the jetting speed of 2m/s of the nozzles according to the discharge capacity, the sand adding amount, the liquid amount and the crack arrangement direction of the fixed point fracturing, and determining that the number of the nozzles on one side of the positions of the hydraulic ejectors is 6;
step 4) then, a cable is used for carrying a magnetic locator, a dispenser and a locating and supporting device to enter a well, the dispensing position of the locating and supporting device is determined according to the depth of a casing coupling measured by the magnetic locator, gunpowder of the magnetic locator is ignited and ignited, a hydraulic cylinder of the magnetic locator is pushed to seat slips on the inner wall of the casing, and the dispenser is lifted out; then, a cable is adopted to carry the gyroscope to go down the well, a guide groove of the gyroscope is butted with an orientation key on the positioning and supporting device, the orientation of the orientation key of the positioning and supporting device is measured, and the cable is lifted up to be taken out of the gyroscope;
and 5) adjusting the positions of a hydraulic ejector nozzle and a positioning guider guide groove in the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), then lowering the directional hydraulic jet fracturing drilling tool, reducing the lowering speed at a position 10m away from the upper part of the positioning support device, observing the apparent hanging weight of a derrick pressure gauge, rotating an oil pipe according to the change of the hanging weight until the guide groove of the positioning guider at the lower part of the directional hydraulic jet fracturing drilling tool is accurately butted with a positioning key on the positioning support device, and lowering the apparent hanging weight of the derrick pressure gauge to 0, namely lowering the directional hydraulic jet fracturing drilling tool to the designed position.
Step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and sequentially completing the fracturing operation of a third single sand body and a fourth single sand body.
The average daily production liquid of 2 wells of the Ordos basin long X tight oil reservoir after the fixed-point fracturing repeated reconstruction is carried out can be 3.1m by detection3And d, the daily oil yield is 1.62t/d, the water content is 38.7 percent, the daily oil increase is 1.02t/d on average, and the yield increasing effect is stable and is continuously effective. The water content of the oil well after fracturing is reduced by 10.9 percent compared with that of the oil well before the measure, which shows that the original reservoir which is not used is used for fixed-point fracturing; and simultaneously, the dipole acoustic wave test before and after the fracturing is carried out on two implementation wells, and the result shows that the difference of the anisotropies before and after the fixed-point fracturing section is obvious, the longitudinal movement degree is obviously improved, and the feasibility of the fixed-point fracturing method is verified.
The field tests of two wells show that the method for repeatedly modifying the fixed-point mining and submerging longitudinal residual oil has good pertinence to the residual enriched reservoir at the upper part of the directional old well perforation section of the multi-layer, thin and interbedded development oil reservoir.
Aiming at the middle and later stages of the development of low-permeability and high-water-content oil reservoirs, the overall oil-water relationship of the oil reservoirs is complex, in order to accurately excavate the residual oil of the longitudinal single sand body of the submerged oil reservoir and prevent the water content of the oil well from rising after pressing, a fixed-position hydraulic jet fracturing method with fixed position is utilized, the fixed-position fracturing operation of the fracturing integration is realized, the construction efficiency is improved, the fixed-position initiation of cracks is realized according to the residual oil distribution relationship, the azimuth of a waterline test and other data, the crack height is controlled, the residual oil of the longitudinal single sand body of the submerged oil reservoir is excavated, the water breakthrough of the oil well after pressing is avoided, and the oil reservoir has wide application prospect; the invention has the characteristics of low construction cost, simple site construction, reliable plugging, obvious effect after pressing and high controllability.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (9)
1. A fixed point fracturing method for residual oil in a single longitudinal sand body of a reservoir of an excavation and submergence old well is characterized by comprising the following steps:
step 1) determining the distribution position and the orientation of the residual oil of a longitudinal single sand body of an old well reservoir;
step 2) establishing a stress profile model of the old well reservoir according to the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), analyzing the fracturing feasibility of the longitudinal single sand body of the old well reservoir, and determining the position and the number of layers of the single sand body in fixed-point fracturing;
step 3) simulating the fracture morphology according to the single sand body fixed-point fracturing position and the layer number determined in the step 2), determining fracture parameters and fracture arrangement directions, and determining the nozzle positions and the nozzle number of the directional hydraulic jet fracturing drilling tool;
step 4), setting the positioning and supporting device into a well, setting, and then setting the gyroscope for positioning and orientation;
step 5) adjusting the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), and then putting the directional hydraulic jet fracturing drilling tool into the well to enable the directional hydraulic jet fracturing drilling tool to be in butt joint with the positioning and supporting device;
step 6) carrying out hydraulic sand blasting perforation and fracturing operation through the directional hydraulic jet fracturing drilling tool, carrying out fixed-point fracturing on a first longitudinal single sand body of the old well reservoir, and submerging residual oil;
and 7) after the first single sand body is fractured, lifting the directional hydraulic jet fracturing drilling tool to a second single sand body, performing hydraulic sand blasting perforation and fracturing operation, and completing the fracturing operation of the remaining single sand bodies in sequence.
2. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 1, is characterized in that: and (2) determining the distribution position and the orientation of the residual oil of the longitudinal single sand body of the old well reservoir in the step 1), based on the dynamic analysis of reservoir development geology and a pulse neutron saturation logging method, and determining the enrichment position and the orientation of the residual oil of the reservoir according to the analysis and monitoring results.
3. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 1, is characterized in that: in the step 2), according to the influence of longitudinal and transverse wave data, interlayer pressure difference and heterogeneity of the old well reservoir on the ground stress, calculating the old well reservoir stress, and establishing an old well reservoir stress profile model, wherein the old well reservoir stress profile model has the following formula:
in the formula:
νp、νs: longitudinal and transverse wave speeds, m/s;
Ed: dynamic Young's modulus, MPa;
Vd: dynamic poisson ratio, no dimensional quantity;
wherein the horizontal minimum principal stress after long-term injection and production is as follows:
in the formula:
σh: horizontal minimum principal stress, MPa;
σv: vertical stress, MPa;
Εh: horizontal dynamic young's modulus, MPa;
Ev: vertical dynamic Young's modulus, MPa;
Vh: horizontal dynamic poisson ratio, no dimension;
VV: vertical dynamic Poisson's ratio, no dimensional quantity;
αh: horizontal biot elastic coefficient, dimensionless;
αv: vertical biot elastic coefficient, no dimensional quantity;
p: reservoir pore pressure, MPa.
4. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 3, characterized in that: according to a stress profile model of an old well reservoir, combining the distribution position of the residual oil of the longitudinal single sand body of the old well reservoir, aiming at different shooting degrees, perforation positions, interlayer stress differences and weak surface thicknesses of the residual oil of the longitudinal single sand body of the old well reservoir, adopting Fracpro PT fracturing software to carry out simulation calculation, determining the position of fixed-point fracturing and the number of layers of the single sand body, and adopting a directional hydraulic jet fracturing drilling tool to dig the residual oil when the stress difference value of a small longitudinal interlayer of the reservoir is less than 2 MPa.
5. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 1, is characterized in that: and 3) simulating the shape of the fixed-point fracturing fracture by using Fracpro PT fracturing software according to the determined fixed-point fracturing position and the number of layers of the single sand body, determining the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed-point fracturing, calculating the throttling pressure difference and the jet speed of the jet nozzle according to the discharge capacity, the sand adding amount, the liquid amount and the fracture arrangement direction of the fixed-point fracturing, and determining the position and the number of the jet nozzles of the directional hydraulic jet fracturing drilling tool.
6. The fixed-point fracturing method for residual oil in single longitudinal sand body of an excavation old well reservoir stratum as claimed in claim 1, wherein the specific operation steps of the step 4) are as follows: the cable is used for carrying a magnetic locator, a dispenser and a locating and supporting device to enter a well, the dispensing position of the locating and supporting device is determined according to the depth of a casing coupling measured by the magnetic locator, gunpowder of the magnetic locator is ignited and detonated, a hydraulic cylinder of the magnetic locator is pushed to seat slips on the inner wall of the casing, and the dispenser is lifted out; and then, a cable is adopted to carry the gyroscope to go down the well, the guide groove of the gyroscope is butted with the orientation key on the positioning and supporting device, the orientation of the orientation key of the positioning and supporting device is measured, and the cable is lifted up to be lifted out of the gyroscope.
7. The method for fixed-point fracturing of residual oil in a single longitudinal sand body of an excavated old well reservoir as claimed in claim 6, wherein the orientation key is a cuboid with a length of 50mm, a width of 10mm and a height of 5 mm.
8. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 1, is characterized in that: and 5) adjusting the positions of a hydraulic ejector nozzle and a positioning guider guide groove in the directional hydraulic jet fracturing drilling tool according to the direction and the direction obtained in the step 4), then lowering the directional hydraulic jet fracturing drilling tool, reducing the drilling speed at a position 10m away from the upper part of the positioning support device, observing the apparent hanging weight of a derrick pressure gauge, rotating an oil pipe according to the change of the hanging weight until the guide groove of the positioning guider at the lower part of the directional hydraulic jet fracturing drilling tool is accurately butted with a positioning key on the positioning support device, and reducing the apparent hanging weight of the derrick pressure gauge to 0, namely lowering the directional hydraulic jet fracturing drilling tool to the designed position.
9. The fixed-point fracturing method for residual oil in single longitudinal sand body of the mining and submerging old well reservoir as claimed in claim 8, characterized in that: the hydraulic ejector is a single-side ejector or a double-side ejector with the phase of 180 degrees, nozzles of the double-side ejector are evenly distributed on two sides of the double-side ejector, the length of the hydraulic ejector body is 380mm, the outer diameter is 100mm, the inner diameter is 40mm, and the diameter of each nozzle is 6.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910068976.5A CN109707362B (en) | 2019-01-24 | 2019-01-24 | Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910068976.5A CN109707362B (en) | 2019-01-24 | 2019-01-24 | Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109707362A CN109707362A (en) | 2019-05-03 |
| CN109707362B true CN109707362B (en) | 2021-01-01 |
Family
ID=66262869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910068976.5A Active CN109707362B (en) | 2019-01-24 | 2019-01-24 | Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109707362B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943196A (en) * | 2021-01-23 | 2021-06-11 | 中国石油天然气股份有限公司 | Fixed-point multi-stage fracturing method for improving longitudinal transformation degree of dense thick layer |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4585063A (en) * | 1982-04-16 | 1986-04-29 | Standard Oil Company (Indiana) | Oil shale retorting and retort water purification process |
| WO2010020982A1 (en) * | 2008-08-19 | 2010-02-25 | Prowell Technologies Ltd | Method for impulse stimulation of oil and gas well production |
| CN103835691A (en) * | 2014-04-03 | 2014-06-04 | 北京捷贝通石油技术有限公司 | Natural selection sweet heart temporary plugging volume fracturing method |
| CN104213891A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer process tubular column for repeated oil well transformation |
| CN104373103A (en) * | 2014-12-08 | 2015-02-25 | 中国石油天然气股份有限公司 | Old well slot temporary blockage refracturing tubular column and method capable of achieving large-displacement construction |
| CN107191169A (en) * | 2017-06-26 | 2017-09-22 | 中国石油天然气股份有限公司 | Refracturing method for the poorly efficient OW of low yield |
| CN207315355U (en) * | 2017-10-24 | 2018-05-04 | 四川久天测控技术有限公司 | A kind of pulsed neutron saturation degree logging instrument underground TT＆C system |
| CN108086964A (en) * | 2017-12-04 | 2018-05-29 | 中煤科工集团西安研究院有限公司 | Coal bed gas horizontal well orients hydrajet tool string and construction method |
| CN108952664A (en) * | 2018-08-22 | 2018-12-07 | 中国石油集团渤海钻探工程有限公司 | A kind of oil/gas well straight well orientation water-jet multistage fracturing method |
-
2019
- 2019-01-24 CN CN201910068976.5A patent/CN109707362B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4585063A (en) * | 1982-04-16 | 1986-04-29 | Standard Oil Company (Indiana) | Oil shale retorting and retort water purification process |
| WO2010020982A1 (en) * | 2008-08-19 | 2010-02-25 | Prowell Technologies Ltd | Method for impulse stimulation of oil and gas well production |
| CN104213891A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer process tubular column for repeated oil well transformation |
| CN103835691A (en) * | 2014-04-03 | 2014-06-04 | 北京捷贝通石油技术有限公司 | Natural selection sweet heart temporary plugging volume fracturing method |
| CN104373103A (en) * | 2014-12-08 | 2015-02-25 | 中国石油天然气股份有限公司 | Old well slot temporary blockage refracturing tubular column and method capable of achieving large-displacement construction |
| CN107191169A (en) * | 2017-06-26 | 2017-09-22 | 中国石油天然气股份有限公司 | Refracturing method for the poorly efficient OW of low yield |
| CN207315355U (en) * | 2017-10-24 | 2018-05-04 | 四川久天测控技术有限公司 | A kind of pulsed neutron saturation degree logging instrument underground TT＆C system |
| CN108086964A (en) * | 2017-12-04 | 2018-05-29 | 中煤科工集团西安研究院有限公司 | Coal bed gas horizontal well orients hydrajet tool string and construction method |
| CN108952664A (en) * | 2018-08-22 | 2018-12-07 | 中国石油集团渤海钻探工程有限公司 | A kind of oil/gas well straight well orientation water-jet multistage fracturing method |
Non-Patent Citations (1)
| Title |
|---|
| 薄互层定点多级脉冲式压裂技术研究;杜现飞等;《钻采工艺》;20180131;第41卷(第1期);65-68 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109707362A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108868748B (en) | Method for calculating repeated fracturing fracture opening pressure of shale gas horizontal well | |
| Lu et al. | A new method of drilling long boreholes in low permeability coal by improving its permeability | |
| CN106285617B (en) | Gas water horizontal well completion method | |
| CN110397428B (en) | Displacement coalbed methane yield increasing method for coalbed methane jointly mined by vertical well and U-shaped butt well | |
| HAIMSON | The hydraulic fracturing method of stress measurement: theory and practice | |
| CN111119826B (en) | Coiled tubing staged fracturing string and string fracturing method | |
| Gensheng et al. | Multistage hydraulic jet acid fracturing technique for horizontal wells | |
| CN107620581B (en) | Construction method of one-well dual-purpose coal mine shaft inspection hole | |
| Huang et al. | Field investigation into directional hydraulic fracturing for hard roof in Tashan Coal Mine | |
| CN111365002B (en) | Ground pre-grouting method for small-section high wellbore in complex stratum | |
| CN108678672A (en) | Deep water superficial part complex lithology formation conduit is efficiently placed in and well head stability forecast method | |
| CN104391042A (en) | Method for detecting mine goaf top and floor deep rock stratum cracks through ultrasonic waves | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN114135265B (en) | Low-cost and high-efficiency transformation process method for low-permeability reservoir of offshore oil field | |
| Moayed et al. | In-situ stress measurements by hydraulic fracturing method at Gotvand Dam site, Iran | |
| CN109707362B (en) | Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir | |
| Miao et al. | Development status and prospect of staged fracturing technology in horizontal wells | |
| CN110714742B (en) | Method for improving recovery ratio of bottom water condensate gas reservoir | |
| CN108343431B (en) | Method for exploring flow network of bedrock fracture underground water system | |
| Liu et al. | A comparative study of hydraulic fracturing with various boreholes in coal seam | |
| CN116378760A (en) | North China type coal field collapse column exploration and evaluation method based on ground directional drilling technology | |
| CN116122774A (en) | Outburst prevention method for combined operation layer gas extraction area of ultra-close coal seam well up-down combination operation | |
| CN103048252A (en) | Testing method of plugging rate of repeated fracturing plugging agent | |
| CN114233369B (en) | Method for precisely eliminating coal and gas outburst by up-and-down combination | |
| RU2199646C1 (en) | Process opening productive pool with differential pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |