CN113669009B - Method and system for decontaminating a reverse condensation zone of a target well - Google Patents
Method and system for decontaminating a reverse condensation zone of a target well Download PDFInfo
- Publication number
- CN113669009B CN113669009B CN202010404390.4A CN202010404390A CN113669009B CN 113669009 B CN113669009 B CN 113669009B CN 202010404390 A CN202010404390 A CN 202010404390A CN 113669009 B CN113669009 B CN 113669009B
- Authority
- CN
- China
- Prior art keywords
- reverse
- condensate
- sidetracking
- fracturing
- target 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
- 238000009833 condensation Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000005494 condensation Effects 0.000 title claims abstract description 40
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000001223 reverse osmosis Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 3
- 239000002253 acid Substances 0.000 description 9
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of gas reservoir development, and discloses a method and a system for removing pollution of a reverse condensation area of a target well. The method comprises the following steps: carrying out window sidetracking on a sleeve of the target well and a reverse condensation area around an original artificial fracture along a preset direction of a target reservoir where the target well is located; fracturing the original artificial fracture to form a new artificial fracture with perforations; injecting a carrier fluid carrying a plugging material into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the maximum horizontal principal stress direction of the target reservoir; and fracturing the reverse condensate area which is drilled laterally to form a crack system in the reverse condensate area, so that the crack system is communicated with a new artificial crack after the plugging material is flowback along with the carrying liquid, and condensate oil in the reverse condensate area flows into the new artificial crack through the crack system. The invention can effectively remove the pollution of the whole anti-condensation area, and the effective period of the removal is long.
Description
Technical Field
The invention relates to the technical field of gas reservoir development, in particular to a method and a system for removing pollution of a reverse condensation area of a target well.
Background
At present, tight sandstone condensate reservoirs are usually developed by adopting fracturing reformation, and after failure type development, as the formation pressure drops below the dew point pressure, a reverse condensate region (or reverse condensate pollution (injury) zone) is formed near the well bore and the original artificial fracture. For compact sandstone condensate gas reservoirs for producing water, the gas carrying capacity is reduced along with the reduction of gas-phase permeability, formation water and condensate oil are gathered near a near well and an original artificial fracture to form a reverse condensate area (or a reverse condensate damage zone), and formation gas cannot pass through the damage zone, so that a gas well cannot be opened finally. For example, a certain condensate gas field is 1-10 wells, primary gas production is 5×10 4m3/d, ground exposure pressure difference is 2.17MPa, after the well is produced for 16 months, gas production is reduced to 0.02×10 4m3/d due to serious reverse condensate pollution, and finally the well is shut down.
At present, a plurality of methods such as circulating gas injection, methanol injection throughput and the like are applied to a gas well generating reverse condensation pollution, and the method is suitable for the early stage and the middle stage of the reverse condensation pollution. The gas or fluid is injected into the oil-gas dialysis channel to form mixed phase displacement with condensate, so that the flowing state of the condensate can be improved, and the condensate after mixed phase can be lifted out of the ground through air flow. For the reverse condensation pollution generated in the later production period of the fractured well, after circulation gas injection, gas can extend to the direction of the maximum horizontal principal stress along the artificial crack, then the interfacial tension of condensate gas in a reverse condensation pollution area near the artificial crack along the direction of the maximum horizontal principal stress is reduced, gas phase permeability and condensate flow state are improved, so that the reverse condensation damage can be effectively relieved, but the gas is difficult to communicate with a reservoir far from the direction of the maximum horizontal principal stress, the oil ring near the direction far from the direction of the maximum horizontal principal stress cannot be relieved, the overall reverse condensation relieving effect is greatly reduced, and the reverse condensation relieving effective period is shorter.
Disclosure of Invention
The invention aims to provide a method and a system for decontaminating a reverse condensation area of a target well, which can effectively decontaminate the whole reverse condensation area and has long effective period.
To achieve the above object, a first aspect of the present invention provides a method for decontaminating a reverse condensation zone of a target well, the method comprising: performing window sidetracking on a casing pipe of the target well and the anti-condensation area around an original artificial fracture along a preset direction of a target reservoir where the target well is located, wherein an included angle between the preset direction and a minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, and perforations are distributed on the edge of the original artificial fracture around the casing pipe; fracturing the original artificial fracture to form a new artificial fracture having the perforations; injecting a carrier fluid carrying a plugging material into the new artificial fracture to temporarily plug the perforations in a preset range of the new artificial fracture along the maximum horizontal main stress direction of the target reservoir; and fracturing the reverse condensate region which is sidetrack-drilled to form a fracture system in the reverse condensate region, so that the fracture system is communicated with the new artificial fracture after the plugging material is returned with the carrier liquid, and condensate oil in the reverse condensate region flows into the new artificial fracture through the fracture system.
Preferably, the sidetracking the casing of the target well and the anti-condensation zone around the original artificial fracture comprises: and (3) adopting a radial water jet process to open a window and sidetrack the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
Preferably, the drilling the casing and the reverse condensation region along the direction of the minimum horizontal principal stress by using a radial water jet process includes: and (3) carrying out window sidetracking on the casing pipe of the target well and the anti-condensation area along the minimum horizontal main stress direction by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area and/or until the longitudinal density of the drilled hole obtained by sidetracking is greater than or equal to a preset density.
Preferably, fracturing the original artificial fracture with perforations of the target well comprises: preprocessing the original artificial crack; carrying out first fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a first particle size propping agent; and performing secondary fracturing on the primary artificial fracture subjected to primary fracturing by adopting a second fracturing fluid carrying a second particle size propping agent, wherein the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
Preferably, before performing the step of sidetracking the casing of the target well and the anti-condensation zone around the original artificial fracture, the method further comprises: judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well; and executing the step of sidetracking the casing and the reverse condensate region of the target well when the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition.
Through the technical scheme, the invention creatively carries out window sidetracking on the sleeve and the anti-condensation area along the minimum stress direction; then, fracturing an original artificial crack, and injecting a carrying liquid carrying a plugging material into a new artificial crack formed after fracturing, so as to temporarily plug perforations on the new artificial crack within (or nearby) a preset range along the direction of the maximum horizontal main stress; finally, fracturing is carried out on the reverse condensate area which is drilled laterally, so that after a fracture system is formed in the condensate area, the fracture system is communicated with a new artificial fracture after carrying fluid is returned, and condensate in the reverse condensate area can flow into the new artificial fracture or a shaft through the fracture system. The invention can effectively remove the pollution of the whole anti-condensation area near the minimum main stress direction, and the effective period of the removal is long.
In a second aspect, the invention provides a system for decontaminating a target well from condensation, the system comprising: the sidetracking device is used for sidetracking a casing pipe of the target well and the anti-condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein an included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, and perforations are distributed on the edge of the original artificial fracture around the casing pipe; a first fracturing device for fracturing the original artificial fracture to form a new artificial fracture having the perforations; the injection device is used for injecting a carrying liquid carrying a plugging material into the new artificial fracture so as to temporarily plug the perforation on the new artificial fracture within a preset range along the maximum horizontal main stress direction of the target reservoir; and the second fracturing device is used for fracturing the reverse condensate area which is drilled laterally so as to form a crack system in the reverse condensate area, so that the crack system is communicated with the new artificial crack after the plugging material is returned with the carrier liquid, and condensate oil in the reverse condensate area flows into the new artificial crack through the crack system.
Details and benefits of the system for decontaminating a reverse osmosis zone of a target well provided by the present invention can be found in the above description of the method for decontaminating a reverse osmosis zone of a target well, and are not repeated here.
A third aspect of the invention provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the above-described method for decontaminating a reverse condensate region of a target well.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic illustration of a reverse condensate region of a target well provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method for decontaminating a reverse condensate region of a target well provided by an embodiment of the present invention;
FIG. 3 is a flow chart of fracturing an original artificial fracture provided by an embodiment of the present invention; and
FIG. 4 is a flow chart of a method for decontaminating a reverse condensate region of a target well provided by an embodiment of the present invention.
Description of the reference numerals
1. Wellbore 2 original artificial fracture
3. Anti-condensation zone 4 sleeve
10. First fracturing device of sidetracking device 20
30. Injection device 40 second fracturing device
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Before describing embodiments of the present invention, a brief description of the reverse condensate region of a target well will be provided. As shown in fig. 1, a reverse condensate region 3 is formed around a wellbore 1 (or casing 4) of the target well and an original artificial fracture 2. Wherein the original artificial crack 2 is located outside the casing 4 around the wellbore 1, and the edge of the original artificial crack 2 may be located at the outer wall of the casing 4 or may be located at a distance from the outer wall of the casing 4, as seen in the direction of the minimum horizontal main stress. And the original artificial fracture 2 is provided with perforations with a certain distribution rule.
The process provided by the invention for decontaminating the reverse osmosis zone of the target well is a repeated fracturing process for decontaminating the reverse osmosis zone for a fractured well (i.e., a target well in which an original artificial fracture has been formed), particularly for condensate reservoirs having a large difference in maximum and minimum level principal stresses (e.g., greater than 10 MPa).
FIG. 2 is a flow chart of a method for decontaminating a reverse condensate region of a target well provided in accordance with an embodiment of the present invention. As shown in fig. 2, the method may include the steps of: step S201, a casing pipe of the target well and the anti-condensation area around an original artificial fracture are laterally drilled along a preset direction of a target reservoir where the target well is located, wherein an included angle between the preset direction and a minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing pipe, and perforations are distributed on the edge of the original artificial fracture; step S202, fracturing the original artificial fracture to form a new artificial fracture with the perforation; step S203, injecting a carrier fluid carrying a plugging material into the new artificial fracture to temporarily plug the perforation on the new artificial fracture within a preset range along the maximum horizontal main stress direction of the target reservoir; and step S204, fracturing the reverse condensate area which is drilled laterally to form a crack system in the reverse condensate area, so that the crack system is communicated with the new artificial crack after the plugging material is returned with the carrier liquid, and condensate oil in the reverse condensate area flows into the new artificial crack through the crack system.
Before performing step S201, the method may further include: judging the compressibility of a target reservoir of the target well and the stability of the well wall of the target well; and executing the step of sidetracking the casing and the reverse condensate region of the target well when the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition.
First, the compressibility (or drillability) of a target reservoir of a target well may be evaluated using the Rickman brittleness index calculation method and the fracture toughness calculation method. Specifically, the expression of the fracking index FI is:
FI＝BIn*KIC_n (1)
in the formula (1): FI dimensionless; BIn is a forward normalized brittleness index, dimensionless; kic_n is the reverse normalized fracture toughness index, dimensionless. Wherein BIn and kic_n are determined by the following formulas (2) and (3), respectively.
BIn＝(BI-BImin)/(BImax-BImin) (2)
KIC_n＝(KIC_max-KIC)/(KIC_max-KIC_min) (3)
In the formulas (2) and (3): BImax and BImin are the maximum and minimum brittleness indices, dimensionless, of the target reservoir, respectively; KIC_max and KIC_min are the maximum and minimum fracture toughness indexes of the target reservoir, MPa.m 1/2, respectively; and BImax, BImin, KIC _max and KIC_min are constants, and the values of the BImax, BImin, KIC _max and KIC_min are determined according to the actual situation of a target reservoir.
Secondly, taking finite element calculation software (for example, software ABAQUS) as a platform, taking the rock mass flow-solid coupling effect and the stress concentration phenomenon caused by the vertical well section with initial stress and radial well rock mass drilling removal into consideration, establishing a 3D target well (the target well can be a radial horizontal well) borehole elastoplastic model, and researching the influence of ground stress difference, azimuth angle of the target well, radius of the target well, length of the target well, windowing position, rock Young modulus and Poisson ratio on the stability of the well wall of the target well. The windowing position is the position of the windowing sidetrack in the next step S201 (the preset direction of the target reservoir, the included angle between the preset direction and the minimum horizontal main stress direction is smaller than or equal to a preset angle (e.g., 10 degrees), for example, the minimum horizontal main stress direction). This step demonstrates, for example, the stability of the borehole wall in the direction of minimum horizontal principal stress, and whether the requirements for sidetracking are met.
And when the fracturing property index of the target reservoir is larger than or equal to a preset fracturing property index threshold value and the influence value on the stability of the well wall is smaller than the preset influence value, determining that the target reservoir meets the condition of windowing sidetracking in the next step.
Because the surrounding anti-condensation area of the original artificial fracture of the target well along the minimum horizontal main stress direction is not easy to form a complex fracture system when the target reservoir is repeatedly fractured in step S202, the casing and the anti-condensation area of the target well are windowed and sidetracked in the minimum horizontal main stress direction in step S201.
Specifically, the sidetracking the casing and the reverse condensation zone of the target well may include: and (3) adopting a radial water jet process to open a window and sidetrack the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress. As shown in fig. 1, the side drilling results show two holes (a hole and B hole) in 180 ° distribution from the horizontal section. In a preferred embodiment, the casing and the anti-condensation zone are sidetracked in a direction of minimum horizontal principal stress until the length of the drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation zone, at which point the oil ring of the anti-condensation contaminated zone is completely penetrated. The distribution range of the condensate ring (e.g., the radius of the condensate ring) can be determined by determining the pressure distribution from the distal end of the reservoir downhole to the wellbore using a numerical simulation method in combination with the bottom-hole flow pressure of the target reservoir, the original formation pressure, and the dew point pressure of the condensate reservoir.
In addition, in order to form a complex fracture system in the anti-condensation area, a radial water jet process can be adopted, and window sidetracking is carried out on the sleeve and the anti-condensation area along the longitudinal direction of the sleeve and along the direction of the minimum horizontal main stress until the longitudinal density of the drilled holes obtained by sidetracking is greater than or equal to the preset density. Wherein the preset density is 1 hole/m.
Because the time from the initial fracturing of the reservoir of the target well to obtain the original artificial fracture is longer, the diversion capacity of the original artificial fracture becomes worse, so after the windowing sidetrack step of the casing and the reverse condensate area is completed, the original artificial fracture needs to be fractured again to recover the diversion capacity.
Specifically, for step S202, fracturing the original artificial fracture may include the following steps, as shown in fig. 3.
Step S301, preprocessing the original artificial crack.
The reservoir near the original artificial fracture may be pretreated with acid to decontaminate wells located around the target well and reduce the fracture pressure of the reservoir for the target well. And for the sandstone reservoir, an acid liquor system of 7-15% (volume fraction) HCl+3-5% (volume fraction) HF is selected to treat reservoir injuries generated by long-term production and primary fracturing in artificial cracks of wells around the target well. In field implementation, experiments are required to be carried out to screen acid liquor formulas compatible with the reservoir, specifically, the mineral characteristics of the reservoir are fully considered in acid liquor selection, conventional hydrochloric acid or earth acid is adopted, and the acid liquor formulas are optimized for the acid-sensitive reservoir so as to prevent acid sensitivity; the acid liquid consumption can be comprehensively determined according to the fracturing fracture simulation and specific well conditions and fracturing process requirements.
Step S302, carrying out first fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a second particle size propping agent.
The low-viscosity fracturing fluid can be used for carrying the propping agent with small particle size, so that the original artificial fracture is preliminarily reformed. Specifically, the fracturing construction can be performed by using a first fracturing fluid carrying 70/140 mesh proppants (volume density of 1.5-1.8g/cm 3). The first fracturing fluid can be conventional guanidine gum fracturing fluid, the discharge capacity is 3.0-5.0m 3/min (the discharge capacity is not more than the discharge capacity of fracturing fluid adopted in the process of acquiring the original artificial fracture), and the viscosity is below 30 mPa.s.
And step S303, performing secondary fracturing on the primary artificial fracture subjected to the primary fracturing by adopting a second fracturing fluid carrying a second particle size propping agent. The second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
The high-viscosity fracturing fluid can be used for carrying the medium-grain-size propping agent, and further expanding and reforming are carried out on the artificial fracture subjected to the first fracturing so as to recover the diversion capability of the original artificial fracture. Specifically, the fracturing construction can be performed by using a second fracturing fluid carrying 30/50 mesh propping agent (volume density of 1.5-1.6g/cm 3). The second fracturing fluid can be conventional guanidine gum fracturing fluid with the discharge capacity of 4.0-6.0m 3/min (the discharge capacity of the second fracturing fluid can be optimized and adjusted according to the fracturing process requirement and the requirement of adding propping agent in the later stage of high sand ratio), and the viscosity is 120-150mPa.s.
After the new artificial fracture is restored to the diversion capability, since some perforations are distributed on the new artificial fracture (perforations with a certain distribution rule are artificially formed on the original artificial fracture after the original artificial fracture is formed), if the perforations near the direction of the maximum horizontal principal stress are not temporarily blocked in advance, in the process of fracturing the reverse condensation zone in step S204, the injected fracturing fluid almost entirely flows into the reverse condensation zone through the perforations near the direction of the maximum principal stress, so that only the reverse condensation zone near the direction of the maximum horizontal principal stress is concentrated and the reverse condensation zone near the direction of the minimum horizontal principal stress is hardly fractured, and thus a fracture system cannot be formed in the reverse condensation zone near the direction of the minimum horizontal principal stress, so that the perforations near the direction of the maximum horizontal principal stress need to be temporarily blocked in step S203 first, and then the reverse condensation zone needs to be fractured in step S204 to form the fracture system.
For step S203, a carrier fluid (e.g., a first fracturing fluid) that carries the cannon ball may be injected into the new artificial fracture. Taking the first fracturing fluid as an example, because the first fracturing fluid is subjected to the action of the maximum horizontal main stress, most of the first fracturing fluid flows to the vicinity of the maximum horizontal main stress direction, so that the cannon ball can temporarily plug the hole around the maximum horizontal main stress direction. During fracturing construction, the discharge capacity of the first fracturing fluid is 3.0-4.0m 3/min, and the number of the cannon eyeballs is 1.2-1.3 times of that of the original perforation.
For step S204, the reverse condensate zone that has been sidetracked may be retrofitted with a low viscosity fracturing fluid carrying small particle size proppants. Specifically, the fracturing construction can be performed by using a third fracturing fluid carrying 70/140 mesh propping agent (volume density is 1.5-1.8g/cm 3). The third fracturing fluid can be conventional guanidine gum fracturing fluid, the discharge capacity is 3.0-5.0m 3/min, and the viscosity is below 20mPa.s. Preferably, the viscosity of the third fracturing fluid is below 10 mpa.s; if the natural fracture of the reservoir is relatively developed, the viscosity can be increased appropriately according to the fluid loss test and the fracture simulation result, for example, the viscosity of the third fracturing fluid can be 10-20mPa.s.
Because the perforations along the vicinity of the direction of the maximum horizontal principal stress are temporarily plugged, the third fracturing fluid can flow into the reverse condensation area through the channel of the direction of the minimum horizontal principal stress obtained by sidetracking so as to fracture the reverse condensation area at the reverse condensation area, thereby forming a fracture system in the reverse condensation area along the direction of the minimum horizontal principal stress. And after the borehole ball is flowback along with the fracturing fluid, the fracture system is communicated with a new artificial fracture, and condensate generated by reverse condensation can flow to the new artificial fracture and the well shaft through the fracture system, so that the pollution of a reverse condensation area of the target well can be relieved, and the productivity of the target well can be recovered.
In summary, the invention creatively firstly drills the casing and the anti-condensation area along the preset direction near the minimum horizontal main stress direction; then, fracturing an original artificial crack, and injecting a carrying liquid carrying a plugging material into a new artificial crack formed after fracturing, so as to temporarily plug perforations on the new artificial crack within a preset range along the direction of the maximum horizontal main stress; finally, fracturing is carried out on the reverse condensate area which is drilled laterally, so that after a fracture system is formed in the condensate area, the fracture system is communicated with a new artificial fracture after carrying fluid is returned, and condensate in the reverse condensate area can flow into the new artificial fracture or a shaft through the fracture system. The invention can effectively remove the pollution of the whole anti-condensation area near the minimum main stress direction, and the effective period of the removal is long.
FIG. 4 is a block diagram of a system for decontaminating a target well provided in accordance with an embodiment of the present invention. As shown in fig. 4, the system may include: the sidetracking device 10 is configured to sidetrack a casing of the target well and the reverse condensation area around an original artificial fracture along a preset direction of a target reservoir where the target well is located, where an included angle between the preset direction and a minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, and the original artificial fracture is located around the casing and perforations are distributed on an edge of the original artificial fracture; a first fracturing means 20 for fracturing said original artificial fracture to form a new artificial fracture having said perforations; an injection device 30 for injecting a carrier fluid carrying a plugging material into the new artificial fracture to temporarily plug the perforations in the new artificial fracture within a predetermined range along the maximum horizontal principal stress direction of the target reservoir; and a second fracturing device 40 for fracturing the reverse condensate area which has been sidetracked to form a fracture system in the reverse condensate area, so that the fracture system is communicated with the new artificial fracture after the plugging material is returned with the carrier liquid, and condensate in the reverse condensate area flows into the new artificial fracture through the fracture system.
Preferably, the sidetracking device is used for sidetracking the casing of the target well and the anti-condensation area around the original artificial fracture, and comprises: and (3) adopting a radial water jet process to open a window and sidetrack the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
Preferably, the sidetracking device is configured to use a radial water jet process to sidetrack the casing and the reverse condensation region along the direction of the minimum horizontal principal stress, and includes: and (3) carrying out window sidetracking on the casing pipe of the target well and the anti-condensation area along the minimum horizontal main stress direction by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area and/or until the longitudinal density of the drilled hole obtained by sidetracking is greater than or equal to a preset density.
Preferably, the first fracturing device comprises: the pretreatment module is used for pretreating the original artificial crack; the first fracturing module is used for carrying out first fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a first particle size propping agent; and the second fracturing module is used for carrying out secondary fracturing on the primary artificial fracture subjected to primary fracturing by adopting a second fracturing fluid carrying a second particle size propping agent, wherein the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
Preferably, the system further comprises: and the judging device is used for judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well, and correspondingly, when the judging device judges that the compressibility of the target reservoir reaches a preset pressure-controllable condition and the stability of the well wall reaches a preset stability condition, the sidetracking device sidetracking the casing pipe of the target well and the anti-condensation area.
Details and benefits of the system for decontaminating a reverse osmosis zone of a target well provided by the present invention can be found in the above description of the method for decontaminating a reverse osmosis zone of a target well, and are not repeated here.
The present invention also provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the above-described method for decontaminating a reverse condensate region of a target well.
The machine-readable storage medium includes, but is not limited to, phase-change Memory (abbreviation for phase-change random access Memory, PHASE CHANGE Random Access Memory, PRAM, also known as RCM/PCRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash Memory (Flash Memory) or other Memory technology, compact disc read only Memory (CD-ROM), digital Versatile Disc (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, and the like.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (11)
1. A method for decontaminating an anti-condensation zone of a target well, the method comprising:
Carrying out window sidetracking on a sleeve of the target well and the reverse condensate area around an original artificial fracture along a preset direction of a target reservoir where the target well is located until the length of a drilled hole obtained by sidetracking is equal to the radius of a condensate ring in the reverse condensate area, wherein an included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the sleeve, and perforations are distributed on the edge of the original artificial fracture;
fracturing the original artificial fracture to form a new artificial fracture having the perforations;
Injecting a carrier fluid carrying a plugging material into the new artificial fracture to temporarily plug the perforations in a preset range of the new artificial fracture along the maximum horizontal main stress direction of the target reservoir; and
And fracturing the reverse condensate area which is drilled laterally to form a crack system in the reverse condensate area, so that the crack system is communicated with the new artificial crack after the plugging material is returned with the carrying liquid, and condensate oil in the reverse condensate area flows into the new artificial crack through the crack system.
2. The method for decontaminating the reverse condensate area of the target well according to claim 1, wherein the step of sidetracking the casing of the target well and the reverse condensate area around the original artificial fracture in the predetermined direction of the target reservoir where the target well is located until the length of the drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the reverse condensate area comprises:
and (3) carrying out window-opening sidetracking on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area.
3. The method for decontaminating the reverse condensation zone of the target well according to claim 2, wherein said employing a radial water jet process to window the casing and the reverse condensation zone in the direction of the minimum horizontal principal stress until the length of the drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the reverse condensation zone comprises:
and (3) carrying out window-opening sidetracking on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area and until the longitudinal density of the drilled hole obtained by sidetracking is greater than or equal to a preset density.
4. The method for decontaminating the reverse condensation zone of a target well of claim 1, wherein fracturing the original artificial fracture comprises:
preprocessing the original artificial crack;
Carrying out first fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a first particle size propping agent; and
Performing secondary fracturing on the primary artificial cracks subjected to primary fracturing by adopting a second fracturing fluid carrying a second particle size propping agent,
The second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
5. The method for decontaminating a reverse osmosis zone of a target well of claim 1, further comprising, prior to performing the step of window sidetracking the casing of the target well and the reverse osmosis zone around the original artificial fracture:
Judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well; and
And executing the step of sidetracking the casing pipe of the target well and the reverse condensation area when the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition.
6. A system for decontaminating an anti-condensation zone of a target well, the system comprising:
The sidetracking device is used for sidetracking a casing pipe of the target well and the reverse condensate area around the original artificial fracture along the preset direction of the target reservoir where the target well is located until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the reverse condensate area, wherein an included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing pipe, and perforations are distributed on the edge of the original artificial fracture;
a first fracturing device for fracturing the original artificial fracture to form a new artificial fracture having the perforations;
the injection device is used for injecting a carrying liquid carrying a plugging material into the new artificial fracture so as to temporarily plug the perforation on the new artificial fracture within a preset range along the maximum horizontal main stress direction of the target reservoir; and
The second fracturing device is used for fracturing the reverse condensate area which is drilled laterally so as to form a crack system in the reverse condensate area, so that the crack system is communicated with the new artificial crack after the plugging material is returned with the carrier liquid, and condensate oil in the reverse condensate area flows into the new artificial crack through the crack system.
7. The system for decontaminating the reverse condensate zone of a target well according to claim 6, wherein the sidetracking means is adapted to sidetrack the casing of the target well and the reverse condensate zone around the original artificial fracture in a predetermined direction along the target reservoir where the target well is located until the sidetracking results in a borehole length equal to the radius of the condensate ring within the reverse condensate zone comprising:
and (3) carrying out window-opening sidetracking on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area.
8. The system for decontaminating the reverse condensate zone of the target well of claim 7, wherein the sidetracking means for sidetracking the casing and the reverse condensate zone in the direction of the minimum horizontal principal stress using a radial water jet process until the sidetracking results in a borehole length equal to the radius of the condensate ring in the reverse condensate zone comprises:
and (3) carrying out window sidetracking on the sleeve of the target well and the anti-condensation area along the minimum horizontal main stress direction by adopting a radial water jet process until the length of a drilled hole obtained by sidetracking is equal to the radius of the condensate ring in the anti-condensation area and until the longitudinal density of the drilled hole obtained by sidetracking is greater than or equal to a preset density.
9. The system for decontaminating the reverse condensation zone of a target well of claim 6, wherein the first fracturing device comprises:
the pretreatment module is used for pretreating the original artificial crack;
The first fracturing module is used for carrying out first fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a first particle size propping agent; and
The second fracturing module is used for carrying out secondary fracturing on the original artificial cracks subjected to the primary fracturing by adopting a second fracturing fluid carrying a second particle size propping agent,
The second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
10. The system for decontaminating the reverse condensation zone of the target well according to claim 6, further comprising:
a judging device for judging the compressibility of the target reservoir of the target well and the stability of the wall of the target well,
Correspondingly, under the condition that the judging device judges that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition, the sidetracking device sidetracking the casing pipe of the target well and the reverse condensation area.
11. A machine-readable storage medium having instructions stored thereon for causing a machine to perform the method for decontaminating the anti-condensation zone of a target well of any of the preceding claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010404390.4A CN113669009B (en) | 2020-05-13 | 2020-05-13 | Method and system for decontaminating a reverse condensation zone of a target well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010404390.4A CN113669009B (en) | 2020-05-13 | 2020-05-13 | Method and system for decontaminating a reverse condensation zone of a target well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113669009A CN113669009A (en) | 2021-11-19 |
| CN113669009B true CN113669009B (en) | 2024-06-07 |
Family
ID=78537062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010404390.4A Active CN113669009B (en) | 2020-05-13 | 2020-05-13 | Method and system for decontaminating a reverse condensation zone of a target well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113669009B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653554A (en) * | 2022-08-17 | 2023-01-31 | 西南石油大学 | Micro-experiment method for removing retrograde condensation injury through gas injection based on micro-fluidic control |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690359A (en) * | 2004-04-26 | 2005-11-02 | 施蓝姆伯格技术公司 | Method and apparatus and program storage device for front tracking in hydraulic fracturing simulators |
| CN102312655A (en) * | 2011-09-02 | 2012-01-11 | 肇东华蓥油田钻采技术服务有限公司 | Radial hydraulic jetting drilling technology |
| WO2014206970A1 (en) * | 2013-06-27 | 2014-12-31 | Wintershall Holding GmbH | Method for extracting natural gas and natural gas condensate from an underground gas condensate deposit that contains a gas mixture having retrograde condensation behavior |
| CN105927197A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | Yield increasing method for temporary plugging volume fracturing repeated transformation of old well of low-permeability sandstone oil reservoir |
| CN107630692A (en) * | 2017-09-07 | 2018-01-26 | 北京泰坦通源天然气资源技术有限公司 | The temporary stall of man-made fracture is to fracturing process in a kind of layer of coal bed gas well |
| CN107956463A (en) * | 2016-10-18 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of ultra-low permeability reservoir straight well omnibearing stereo fracturing process |
| CN108119122A (en) * | 2017-12-05 | 2018-06-05 | 北京捷贝通石油技术股份有限公司 | It is a kind of to cover the well staged fracturing method that complicates |
| RU2660683C1 (en) * | 2017-06-22 | 2018-07-09 | Акционерное общество "Российская инновационная топливно-энергетическая компания (АО "РИТЭК") | Method of developing low-permeability oil fields based on the use of horizontal wells with longitudinal fractures of hydraulic fracturing |
| CN108518210A (en) * | 2018-03-29 | 2018-09-11 | 北京斯迪莱铂油气技术有限公司 | A kind of Condensate Gas Reservoir pressure break oil extraction gas production method |
| CN108612508A (en) * | 2018-04-24 | 2018-10-02 | 东方宝麟科技发展(北京)有限公司 | A kind of shale gas fractured horizontal well new method using high-strength degradable temporary plugging ball |
| CN110005392A (en) * | 2019-04-30 | 2019-07-12 | 东北大学 | Determine the method that segment length and new crack steering distance are blocked when shale crack tip temporarily blocks up pressure break |
| CN111042790A (en) * | 2019-12-24 | 2020-04-21 | 中国石油大学(北京) | Repeated fracturing method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945327B2 (en) * | 2003-02-11 | 2005-09-20 | Ely & Associates, Inc. | Method for reducing permeability restriction near wellbore |
| US9027641B2 (en) * | 2011-08-05 | 2015-05-12 | Schlumberger Technology Corporation | Method of fracturing multiple zones within a well using propellant pre-fracturing |
| US9121272B2 (en) * | 2011-08-05 | 2015-09-01 | Schlumberger Technology Corporation | Method of fracturing multiple zones within a well |
| US20140054050A1 (en) * | 2012-08-24 | 2014-02-27 | Halliburton Energy Services, Inc. | Gas Fracture Injection to Overcome Retrograde Condensation in Gas Wells |
-
2020
- 2020-05-13 CN CN202010404390.4A patent/CN113669009B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690359A (en) * | 2004-04-26 | 2005-11-02 | 施蓝姆伯格技术公司 | Method and apparatus and program storage device for front tracking in hydraulic fracturing simulators |
| CN102312655A (en) * | 2011-09-02 | 2012-01-11 | 肇东华蓥油田钻采技术服务有限公司 | Radial hydraulic jetting drilling technology |
| WO2014206970A1 (en) * | 2013-06-27 | 2014-12-31 | Wintershall Holding GmbH | Method for extracting natural gas and natural gas condensate from an underground gas condensate deposit that contains a gas mixture having retrograde condensation behavior |
| CN105927197A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | Yield increasing method for temporary plugging volume fracturing repeated transformation of old well of low-permeability sandstone oil reservoir |
| CN107956463A (en) * | 2016-10-18 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of ultra-low permeability reservoir straight well omnibearing stereo fracturing process |
| RU2660683C1 (en) * | 2017-06-22 | 2018-07-09 | Акционерное общество "Российская инновационная топливно-энергетическая компания (АО "РИТЭК") | Method of developing low-permeability oil fields based on the use of horizontal wells with longitudinal fractures of hydraulic fracturing |
| CN107630692A (en) * | 2017-09-07 | 2018-01-26 | 北京泰坦通源天然气资源技术有限公司 | The temporary stall of man-made fracture is to fracturing process in a kind of layer of coal bed gas well |
| CN108119122A (en) * | 2017-12-05 | 2018-06-05 | 北京捷贝通石油技术股份有限公司 | It is a kind of to cover the well staged fracturing method that complicates |
| CN108518210A (en) * | 2018-03-29 | 2018-09-11 | 北京斯迪莱铂油气技术有限公司 | A kind of Condensate Gas Reservoir pressure break oil extraction gas production method |
| CN108612508A (en) * | 2018-04-24 | 2018-10-02 | 东方宝麟科技发展(北京)有限公司 | A kind of shale gas fractured horizontal well new method using high-strength degradable temporary plugging ball |
| CN110005392A (en) * | 2019-04-30 | 2019-07-12 | 东北大学 | Determine the method that segment length and new crack steering distance are blocked when shale crack tip temporarily blocks up pressure break |
| CN111042790A (en) * | 2019-12-24 | 2020-04-21 | 中国石油大学(北京) | Repeated fracturing method and device |
Non-Patent Citations (6)
| Title |
|---|
| 丘东气田反凝析污染评价及解除方法研究;高建军;韩继凡;郝巍;仓辉;徐建红;;特种油气藏;第17卷(第02期);第85-87页 * |
| 低渗致密砂岩凝析气藏液锁损害机理及防治――以吐哈油田丘东气藏为例;舒勇;鄢捷年;熊春明;张建军;李志勇;蒋玉双;;石油勘探与开发(第05期);第628-634页 * |
| 八角场致密凝析气藏水平井二期井筒复合转向压裂工艺技术剖析;赵斌;潘用平;吴月先;刘威;尧君;段长春;钟水清;;钻采工艺(第05期);第55-57页 * |
| 平湖油气田八角亭构造BG1井低产分析及储层改造;马国新;;海洋石油(第02期);第40-43页 * |
| 桥-白深层凝析气藏有效开发技术研究及应用;陈锋;内蒙古石油化工;20140731;第10卷(第13期);90-92 * |
| 深层致密凝析气藏可动用性分析及开发技术对策;王乐之等;中国矿业;20130615;第22卷(第6期);78-81 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113669009A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109763804B (en) | Staged temporary plugging fracturing method for horizontal well | |
| CA2580590C (en) | Apparatus and method of fracturing | |
| US7036594B2 (en) | Controlling a pressure transient in a well | |
| US20150233226A1 (en) | Method for providing multiple fractures in a formation | |
| Vasquez et al. | Laboratory development and successful field application of a conformance polymer system for low-, medium-, and high-temperature applications | |
| McDaniel et al. | Overview of stimulation technology for horizontal completions without cemented casing in the lateral | |
| Mogensen et al. | A Comprehensive Model for Acid Stimulation of Lower Completions | |
| CN113669009B (en) | Method and system for decontaminating a reverse condensation zone of a target well | |
| CN104594869A (en) | reservoir reconstruction method | |
| CN114961673B (en) | Expansion method for salt cavern gas storage | |
| Stanley et al. | Global application of coiled-tubing acid tunneling yields effective carbonate stimulation | |
| Ellis et al. | Application of hydraulic fractures in openhole horizontal wells | |
| US5462118A (en) | Method for enhanced cleanup of horizontal wells | |
| US20190112902A1 (en) | Treatment isolation in restimulations with inner wellbore casing | |
| Vasquez et al. | Successful field implementation of a novel solids-free system to control fluid loss during overbalanced workover operations in Southern Argentina | |
| CN115081352B (en) | Design optimization method and device for deepwater high-temperature high-pressure loose sandstone end portion sand removal process | |
| Bist et al. | Diverting agents in the oil and gas industry: A comprehensive analysis of their origins, types, and applications | |
| Fawwaz et al. | First Successful Channel Fracturing Job, in the Middle East, Across Darcy-Permeability Sandstone Formation in Challenging Preperforated Liner Disposal Well Proves to be the Optimum Solution for Enhancing Injectivity | |
| Xiao et al. | Slurry acid fracturing was first ever proposed to unlock the production potential in low permeability carbonate reservoir in central Iraq | |
| Chacon et al. | Novel abrasive perforating with acid soluble material and subsequent hydrajet assisted stimulation provides outstanding results in carbonate gas well | |
| CN113638725A (en) | Acid fracturing method for solution reservoir | |
| US10040985B2 (en) | Compositons and methods for curing lost circulation | |
| CN104762070A (en) | Drilling liquid capable of passing through coal bed or carbonaceous mudstone for slant interval of horizontal well | |
| Alonso Perex et al. | Successful Offshore Application of Acid Tunneling Technology: Overcoming the Difficulties of High Depths, Temperatures, and Deviations | |
| CN114510757B (en) | Acid fracturing transformation process method for tracking and locating holes |
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 |