CN210068120U - 4-inch half-casing separate-layer fracturing string - Google Patents
4-inch half-casing separate-layer fracturing string Download PDFInfo
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- CN210068120U CN210068120U CN201920357075.3U CN201920357075U CN210068120U CN 210068120 U CN210068120 U CN 210068120U CN 201920357075 U CN201920357075 U CN 201920357075U CN 210068120 U CN210068120 U CN 210068120U
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Abstract
The utility model discloses a 4 cun half sleeve pipe layering fracturing string, including level pressure sliding sleeve, packing subassembly, hydraulic anchor, release packer and connecting pipe, wherein the packing subassembly is a plurality of, the connecting pipe includes first connecting pipe, second connecting pipe and third connecting pipe, and wherein the second connecting pipe is a plurality of, level pressure sliding sleeve upper end is connected the packing subassembly through first connecting pipe, and wherein loop through a plurality of second connecting pipes between a plurality of packing subassemblies and connect from bottom to top, be connected through the third connecting pipe between packing subassembly and the hydraulic anchor of upper end, wherein hydraulic anchor upper end is connected the release packer, level pressure sliding sleeve, packing subassembly, hydraulic anchor and release packer all are equipped with interior through-hole, and wherein the interior through-hole diameter of packing subassembly, hydraulic anchor and release packer all is greater than the interior through-hole diameter of level pressure sliding sleeve.
Description
Technical Field
The utility model belongs to the technical field of oil field exploration development borehole operation apparatus, especially, relate to a 4 cun half sleeve pipe layering fracturing tubular column for the extensive volume fracturing of 4 cun half cased holes of hyposmosis oil reservoir reforms transform, improves single well output.
Background
The existing oil field ultra-low permeability oil reservoir is influenced by poor physical properties, a displacement system is slowly established, the yield of a single well is low after conventional fracturing is put into production, the decrement is larger, in recent years, by taking the idea of 'volume fracturing', the mixed water fracturing measure developed by 'large discharge capacity, large sand volume and large liquid volume' is adopted, the yield is remarkably increased, and the yield stabilizing effect is better. Chinese patent documents with the authorization number of CN205445569U and the authorization date of 2016, 8 and 10 disclose a construction pipe column capable of realizing layering volume fracturing of a directional well, which relate to the technical field of oil field production and design a construction pipe column capable of realizing 5 days1/2"the standing string layering volume fracturing string structure under the light casing pipe condition, this utility model connects gradually high-pressure plug, Y341-114 lower seal packer, sliding sleeve safety joint, Y341-114 middle seal packer, sliding sleeve sand blaster, Y341-114 upper seal packer with 445 give up packer, solved 51/2"problem of two-layer stratified volume fracturing under optical casing conditions. The separate-layer fracturing string downhole tool represented by the patent documents is complex, has large unsealing difficulty and larger risk of downhole accidents, and cannot be applied to separate-layer fracturing of 4-inch semi-small casing completionA fractured oil well; the conventional separate-layer fracturing pipe column is limited by the existing well body structure, and the construction displacement cannot meet the requirement of large displacement. In order to meet the requirement of improving the yield of a single well by the volume fracturing of oil well layered mixed water of 4-inch half-casing well completion, a set of 4-inch half-casing layered fracturing pipe column and a fracturing method are developed in a targeted mode, the blank of a layered volume fracturing technology of a small casing well with the inner diameter of 101.6mm is filled, meanwhile, the construction period is shortened, and the fracturing pipe column and fracturing construction are simpler, safer and more reliable, and are very necessary.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a 4 cun half sleeve pipe layering fracturing string, overcome among the prior art 1: the underground tool of the separate-layer fracturing pipe column is complex, the deblocking difficulty is high, and the underground accident risk is large; 2: the existing fracturing string cannot be applied to a separate-layer fracturing oil well completed by a 4-inch semi-small casing; 3: the conventional separate-layer fracturing string is limited by the existing well structure, and the construction displacement cannot meet the requirement of large displacement.
In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a 4 cun half casing pipe separate layer fracturing string, includes level pressure sliding sleeve, seals and separates subassembly, hydraulic anchor, release packer and connecting pipe, wherein seals and separates the subassembly and be a plurality ofly, the connecting pipe includes first connecting pipe, second connecting pipe and third connecting pipe, and wherein the second connecting pipe is a plurality of, level pressure sliding sleeve upper end is connected through first connecting pipe and is sealed and separate the subassembly, and wherein loop through a plurality of second connecting pipes between a plurality of packing subassemblies and connect from bottom to top, be connected through the third connecting pipe between the packing subassembly of upper end and the hydraulic anchor, wherein hydraulic anchor upper end is connected the release packer, level pressure sliding sleeve, packing subassembly, hydraulic anchor and release packer all are equipped with the interior through-hole, and wherein the interior through-hole diameter that seals subassembly, hydraulic anchor and release packer all is greater than the interior through-hole diameter of level pressure sliding sleeve.
Preferably, pack apart the subassembly and include middle packer and fracturing sliding sleeve, wherein the fracturing sliding sleeve is connected in middle packer upper end, middle packer and fracturing sliding sleeve all are equipped with interior through-hole, and wherein the interior through-hole diameter of fracturing sliding sleeve is greater than or equal to the interior through-hole diameter of middle packer.
Preferably, the external diameter of constant pressure sliding sleeve is 89mm, wherein the external diameter of middle packer is 94mm, wherein the external diameter of fracturing sliding sleeve is 85mm, wherein the external diameter of hydraulic anchor is 94mm, wherein the external diameter of packer of giving up is 94mm, the inside bore diameter of packer of giving up is 31mm, the inside bore diameter of middle packer is 35mm ≦ d <42mm, wherein the inside bore diameter of a plurality of middle packers increases from bottom to top step by step.
Preferably, the diameter of the inner through hole before the constant-pressure sliding sleeve is pressed and opened is 25mm, and the diameter of the inner through hole after the constant-pressure sliding sleeve is pressed and opened is 35 mm.
Preferably, the middle packer is a Y341 packer, the releasing packer is a Y445 releasing packer, and the diameter of the inner through hole of the releasing packer after releasing is 42 mm.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model discloses an oil pipe puts down the fracturing string target zone perforation section position, the fracturing sliding sleeve switch is opened in grades to the soluble ball of appointed specification of pumping, realize the seat seal, open the passageway of pit shaft and reservoir, lose the fracturing string assigned position, the motionless fracturing string is process flows such as layering volume fracturing step by step, and lift through special fishing tool after fracturing, play the fracturing string, thereby furthest improves the measure well construction discharge capacity of 4 cun half sleeve pipe completions, the single-section discharge capacity can reach 4m3More than min;
(2) the utility model discloses the fracturing string can realize 4 cun half sleeve pipe layering volume fracturing of directional well, single section construction discharge capacity 4m3More than min, the optical casing volume fracturing and the layered fine fracturing are combined to be integrated into a fixed pipe column layered volume fracturing drilling tool, the process is strong in pertinence, and the problem of effective use of a thick oil layer which is developed by a 4-inch half-small casing completion and a separation interlayer is solved;
(3) the utility model discloses a 4 very little half sleeve pipe layering fracturing string simple structure, safe and reliable more has filled including the blank of the layering volume fracturing technique of footpath 101.6 mm's little cased well, has further shortened construction cycle.
Drawings
Figure 1, the utility model relates to a 4 cun half sleeve pipe layering fracturing tubular column structure sketch map.
Description of reference numerals:
1-constant pressure sliding sleeve, 2-middle packer, 3-fracturing sliding sleeve, 4-hydraulic anchor, 5-releasing packer, 6-first connecting pipe, 7-second connecting pipe and 8-third connecting pipe.
Detailed Description
The following description of the embodiments of the present invention is provided in connection with the following embodiments:
it should be noted that the structures, ratios, sizes, etc. illustrated in the present specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions that the present invention can be implemented, and any modifications of the structures, changes of the ratio relationships or adjustments of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the functions and the achievable purposes of the present invention.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Example 1
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
Example 2
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
Example 3
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
As shown in fig. 1, preferably, the outer diameter of the constant pressure sliding sleeve 1 is 89mm, wherein the outer diameter of the middle packer 2 is 94mm, wherein the outer diameter of the fracturing sliding sleeve 3 is 85mm, wherein the outer diameter of the hydraulic anchor 4 is 94mm, wherein the outer diameter of the releasing packer 5 is 94mm, the diameter of the inner through hole of the releasing packer 5 is 31mm, the diameter of the inner through hole of the middle packer 2 is 35mm < d <42mm, and wherein the diameters of the inner through holes of the plurality of middle packers 2 are gradually increased from bottom to top.
Example 4
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
As shown in fig. 1, preferably, the outer diameter of the constant pressure sliding sleeve 1 is 89mm, wherein the outer diameter of the intermediate packer 2 is 94mm, wherein the outer diameter of the fracturing sliding sleeve 3 is 85mm, wherein the outer diameter of the hydraulic anchor 4 is 94mm, wherein the outer diameter of the packer 5 is 94mm, the diameter of the inner through hole of the packer 5 is 31mm, the diameter of the inner through hole of the intermediate packer 2 is 35mm ≦ d <42mm, and wherein the diameters of the inner through holes of the intermediate packers 2 increase from bottom to top.
Preferably, the diameter of the inner through hole before the constant pressure sliding sleeve 1 is pressed and opened is 25mm, and the diameter of the inner through hole after the constant pressure sliding sleeve 1 is pressed and opened is 35 mm.
As shown in fig. 1, preferably, the intermediate packer 2 is a Y341 packer, and the releasing packer 5 is a Y445 releasing packer, wherein the diameter of the inner through hole of the releasing packer 5 after releasing is 42 mm.
Example 5
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
As shown in fig. 1, preferably, the outer diameter of the constant pressure sliding sleeve 1 is 89mm, wherein the outer diameter of the intermediate packer 2 is 94mm, wherein the outer diameter of the fracturing sliding sleeve 3 is 85mm, wherein the outer diameter of the hydraulic anchor 4 is 94mm, wherein the outer diameter of the packer 5 is 94mm, the diameter of the inner through hole of the packer 5 is 31mm, the diameter of the inner through hole of the intermediate packer 2 is 35mm ≦ d <42mm, and wherein the diameters of the inner through holes of the intermediate packers 2 increase from bottom to top.
Preferably, the diameter of the inner through hole before the constant pressure sliding sleeve 1 is pressed and opened is 25mm, and the diameter of the inner through hole after the constant pressure sliding sleeve 1 is pressed and opened is 35 mm.
As shown in fig. 1, preferably, the intermediate packer 2 is a Y341 packer, and the releasing packer 5 is a Y445 releasing packer, wherein the diameter of the inner through hole of the releasing packer 5 after releasing is 42 mm.
As shown in fig. 1, preferably, the fracturing method of the 4-inch half-casing separate zone fracturing string comprises the following steps:
step 1) determining the number of packing assemblies, wherein when the number of the separate-layer fracturing sections is N, the number of the packing assemblies is N-1, the diameters of through holes in the packing assemblies are gradually increased from bottom to top, and the packing assemblies, a constant-pressure sliding sleeve 1, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe are assembled into the fracturing string;
step 2) fracturing the pipe column: connecting the fracturing string with an oil pipe after flushing, then lowering the fracturing string to a preset position of a target reservoir, and primarily fixing the fracturing string by using a hydraulic anchor 4 through pressing the oil pipe on the ground; the pumping soluble ball is located on the constant-pressure sliding sleeve 1, a plurality of middle packers 2 and releasing packers 5 are pressed and set on the oil pipe through the ground, then the constant-pressure sliding sleeve 1 is continuously pressed and opened, and a lower-layer construction channel is opened;
step 3) dropping the soluble ball at the releasing packer 5 by pumping, continuously pressurizing and starting a releasing device of the releasing packer 5, then tripping out an oil pipe connected with a fracturing string and a releasing joint of the releasing packer 5, and then performing first-layer fracturing;
step 4), the pumping soluble ball is located at the lowest fracturing sliding sleeve 3, the fracturing sliding sleeve 3 is opened by pumping after the pumping is in place, a lower construction channel is blocked, the fracturing fluid is ensured to enter a second layer, and then the second layer fracturing is carried out;
step 5) repeating the step 4), and completing N-layer fracturing from bottom to top in sequence;
and 6) after the completion of the step 6), lifting and unsealing the lower fishing drilling tool, and taking out the fracturing string.
Example 6
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
As shown in fig. 1, preferably, the outer diameter of the constant pressure sliding sleeve 1 is 89mm, wherein the outer diameter of the intermediate packer 2 is 94mm, wherein the outer diameter of the fracturing sliding sleeve 3 is 85mm, wherein the outer diameter of the hydraulic anchor 4 is 94mm, wherein the outer diameter of the packer 5 is 94mm, the diameter of the inner through hole of the packer 5 is 31mm, the diameter of the inner through hole of the intermediate packer 2 is 35mm ≦ d <42mm, and wherein the diameters of the inner through holes of the intermediate packers 2 increase from bottom to top.
Preferably, the diameter of the inner through hole before the constant pressure sliding sleeve 1 is pressed and opened is 25mm, and the diameter of the inner through hole after the constant pressure sliding sleeve 1 is pressed and opened is 35 mm.
As shown in fig. 1, preferably, the intermediate packer 2 is a Y341 packer, and the releasing packer 5 is a Y445 releasing packer, wherein the diameter of the inner through hole of the releasing packer 5 after releasing is 42 mm.
As shown in fig. 1, preferably, the fracturing method of the 4-inch half-casing separate zone fracturing string comprises the following steps:
step 1) determining the number of packing assemblies, wherein when the number of the separate-layer fracturing sections is N, the number of the packing assemblies is N-1, the diameters of through holes in the packing assemblies are gradually increased from bottom to top, and the packing assemblies, a constant-pressure sliding sleeve 1, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe are assembled into the fracturing string;
step 2) fracturing the pipe column: connecting the fracturing string with an oil pipe after flushing, then lowering the fracturing string to a preset position of a target reservoir, and primarily fixing the fracturing string by using a hydraulic anchor 4 through pressing the oil pipe on the ground; the pumping soluble ball is located on the constant-pressure sliding sleeve 1, a plurality of middle packers 2 and releasing packers 5 are pressed and set on the oil pipe through the ground, then the constant-pressure sliding sleeve 1 is continuously pressed and opened, and a lower-layer construction channel is opened;
step 3) dropping the soluble ball at the releasing packer 5 by pumping, continuously pressurizing and starting a releasing device of the releasing packer 5, then tripping out an oil pipe connected with a fracturing string and a releasing joint of the releasing packer 5, and then performing first-layer fracturing;
step 4), the pumping soluble ball is located at the lowest fracturing sliding sleeve 3, the fracturing sliding sleeve 3 is opened by pumping after the pumping is in place, a lower construction channel is blocked, the fracturing fluid is ensured to enter a second layer, and then the second layer fracturing is carried out;
step 5) repeating the step 4), and completing N-layer fracturing from bottom to top in sequence;
and 6) after the completion of the step 6), lifting and unsealing the lower fishing drilling tool, and taking out the fracturing string.
Preferably, the step 2) is performed with fracturing the pipeThe oil pipe connected with the column is 27/8"flat P110 grade oil pipe; the diameter of the soluble ball adopted in the step 2) is 30mm, the pressure is 20MPa during seat sealing, and the pressure is continuously increased by 25MPa after the seat sealing is pressed until the pressure is released.
Example 7
As shown in figure 1, the utility model discloses a 4-inch half-casing separate-layer fracturing string, which comprises a constant-pressure sliding sleeve 1, a packing component, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe, wherein the packing components are multiple, the connecting pipes comprise a first connecting pipe 6, a second connecting pipe 7 and a third connecting pipe 8, wherein, a plurality of second connecting pipes 7 are provided, the upper end of the constant pressure sliding sleeve 1 is connected with the packing component through the first connecting pipe 6, wherein the plurality of packing components are sequentially connected from bottom to top through a plurality of second connecting pipes 7, the packing component at the uppermost end is connected with the hydraulic anchor 4 through a third connecting pipe 8, wherein the upper end of the hydraulic anchor 4 is connected with a releasing packer 5, the constant pressure sliding sleeve 1, the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor 4 and the releasing packer 5 are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve 1.
As shown in fig. 1, preferably, the packing assembly comprises a middle packer 2 and a fracturing sliding sleeve 3, wherein the fracturing sliding sleeve 3 is connected to the upper end of the middle packer 2, the middle packer 2 and the fracturing sliding sleeve 3 are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve 3 is greater than or equal to that of the inner through hole of the middle packer 2.
As shown in fig. 1, preferably, the outer diameter of the constant pressure sliding sleeve 1 is 89mm, wherein the outer diameter of the intermediate packer 2 is 94mm, wherein the outer diameter of the fracturing sliding sleeve 3 is 85mm, wherein the outer diameter of the hydraulic anchor 4 is 94mm, wherein the outer diameter of the packer 5 is 94mm, the diameter of the inner through hole of the packer 5 is 31mm, the diameter of the inner through hole of the intermediate packer 2 is 35mm ≦ d <42mm, and wherein the diameters of the inner through holes of the intermediate packers 2 increase from bottom to top.
Preferably, the diameter of the inner through hole before the constant pressure sliding sleeve 1 is pressed and opened is 25mm, and the diameter of the inner through hole after the constant pressure sliding sleeve 1 is pressed and opened is 35 mm.
As shown in fig. 1, preferably, the intermediate packer 2 is a Y341 packer, and the releasing packer 5 is a Y445 releasing packer, wherein the diameter of the inner through hole of the releasing packer 5 after releasing is 42 mm.
As shown in fig. 1, preferably, the fracturing method of the 4-inch half-casing separate zone fracturing string comprises the following steps:
step 1) determining the number of packing assemblies, wherein when the number of the separate-layer fracturing sections is N, the number of the packing assemblies is N-1, the diameters of through holes in the packing assemblies are gradually increased from bottom to top, and the packing assemblies, a constant-pressure sliding sleeve 1, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe are assembled into the fracturing string;
step 2) fracturing the pipe column: connecting the fracturing string with an oil pipe after flushing, then lowering the fracturing string to a preset position of a target reservoir, and primarily fixing the fracturing string by using a hydraulic anchor 4 through pressing the oil pipe on the ground; the pumping soluble ball is located on the constant-pressure sliding sleeve 1, a plurality of middle packers 2 and releasing packers 5 are pressed and set on the oil pipe through the ground, then the constant-pressure sliding sleeve 1 is continuously pressed and opened, and a lower-layer construction channel is opened;
step 3) dropping the soluble ball at the releasing packer 5 by pumping, continuously pressurizing and starting a releasing device of the releasing packer 5, then tripping out an oil pipe connected with a fracturing string and a releasing joint of the releasing packer 5, and then performing first-layer fracturing;
step 4), the pumping soluble ball is located at the lowest fracturing sliding sleeve 3, the fracturing sliding sleeve 3 is opened by pumping after the pumping is in place, a lower construction channel is blocked, the fracturing fluid is ensured to enter a second layer, and then the second layer fracturing is carried out;
step 5) repeating the step 4), and completing N-layer fracturing from bottom to top in sequence;
and 6) after the completion of the step 6), lifting and unsealing the lower fishing drilling tool, and taking out the fracturing string.
Preferably, the oil pipe connected with the fracturing string in the step 2) is 27/8"flat P110 grade oil pipe; the diameter of the soluble ball adopted in the step 2) is 30mm, the pressure is 20MPa during seat sealing, and the pressure is continuously increased by 25MPa after the seat sealing is pressed until the pressure is released.
It is preferable thatThe diameter of the soluble ball adopted in the step 3) is 35mm, wherein the diameter of the inner through hole of the releasing packer 5 after releasing is 42mm, and the discharge capacity of the fracturing construction of the first layer of fracturing is 4m3More than min.
Preferably, the diameter of the soluble ball adopted in the step 4) is 38mm, and the displacement of the soluble ball adopted by pumping is less than 1m3Min, wherein the displacement of the fracturing construction of the second layer fracturing is 4m3More than min.
Preferably, the step 5) repeats the step 4), wherein the diameter of the soluble ball is gradually increased from bottom to top according to the diameter of the inner through hole of the middle packer 2, and wherein the diameter of the soluble ball is larger than the diameter of the inner through hole of the middle packer 2.
And (3) lowering the fracturing string in the step 2) to a preset position of a target reservoir, and ensuring that the upper and lower packers clamp the upper perforation section while avoiding casing joint hoops.
The position between the two adjacent packers is determined according to the depth of a reservoir stratum, the packer is guaranteed to clamp a perforation section, the distance between the position of the Y341 packer and the depth of the lower part of the upper perforation section is less than or equal to 1m, and underground accidents caused by sand setting at the position of the packer are avoided.
Step 6) deblocking can realize hierarchical deblocking, and the deblocking stroke is forced to be started, and packer deblocking power is 4~6T, lifts the fracturing string and surpasses 15~20T, and the packer can be released, can carry out the secondary after releasing and salvage the operation.
Example 8
Will the utility model discloses fracturing string and fracturing method are applied to on-the-spot 4 cun half sleeves:
step 1) determining the number of packing assemblies, wherein the number of the separate fracturing stages is 4, the number of the packing assemblies is 3, the diameter of an inner through hole of each packing assembly is gradually increased from bottom to top, and 3 groups of packing assemblies, a constant pressure sliding sleeve 1, a hydraulic anchor 4, a releasing packer 5 and a connecting pipe are assembled into the fracturing string;
step 2) fracturing the pipe column: after well flushing, adopt 27/8The flat P110 steel grade oil pipe is connected with a fracturing pipe column, then the fracturing pipe column is lowered to a preset position of a target reservoir, and the fracturing pipe column is initially pressed by the oil pipe on the ground by using a hydraulic anchor 4Fixing; the soluble ball seat with the diameter of 30mm is placed at the position of the constant pressure sliding sleeve 1 by pumping, 3 middle packers 2 and the releasing packer 5 are set under the pressure of 20MPa for an oil pipe through the ground, then the constant pressure sliding sleeve 1 is opened under the continuous pressure of 25MPa, and a lower-layer construction channel is opened;
step 3) dropping the soluble ball with the diameter of 35mm at the releasing packer 5 by pumping, continuously pressurizing and starting a releasing device of the releasing packer 5, then pulling out an oil pipe connected with a fracturing string and a releasing joint of the releasing packer 5, and then performing first-layer fracturing;
step 4) at 0.6m3A/min displacement pump phi 38mm soluble ball is located at the lowest fracturing sliding sleeve 3, after the pump is in place, the fracturing sliding sleeve 3 is opened by pumping, a lower construction channel is blocked, fracturing fluid is ensured to enter a second layer, and then second layer fracturing is carried out;
step 5) at 0.6m3A/min displacement pump phi 39mm soluble ball is located at the penultimate fracturing sliding sleeve 3, after the pump is in place, the fracturing sliding sleeve 3 is pressed to open, a lower layer construction channel is sealed, fracturing fluid is ensured to enter a third layer, and then the third layer fracturing is carried out;
at 0.6m3A/min displacement pump phi 40mm soluble ball is located at the last but one third fracturing sliding sleeve 3, after the pump is in place, the fracturing sliding sleeve 3 is opened by pumping, a lower-layer construction channel is blocked, the fracturing fluid is ensured to enter a fourth layer, and then the fourth layer fracturing is carried out;
and step 6) closing the well and carrying out diffusion for 72h, controlling blowout by adopting a 4-8 mm nozzle, forcing the crack to be closed, lifting the lower special fishing drilling tool for 6T after blowout is finished, carrying out grouping and deblocking, and taking out the fracturing drilling tool.
The utility model discloses a level pressure sliding sleeve 1, Y341 packer 2, fracturing sliding sleeve 3, hydraulic anchor 4, packer 5 of giving up and connecting pipe are prior art.
The utility model discloses the theory of operation of fracturing string as follows:
the utility model discloses fracturing string level pressure sliding sleeve 1, packing subassembly, hydraulic anchor 4, release packer 5 and connecting pipe are constituteed, go into predetermined fracturing position with the fracturing string through oil pipe, beat the pressure through the ground for oil pipe and utilize hydraulic anchor 4 to fix the fracturing string for the first time, then the pump sending soluble ball is fallen in level pressure sliding sleeve 1 department, beat through the ground for oil pipe and sit and seal a plurality of middle packers 2 and release packer 5, then continuously beat and press and open level pressure sliding sleeve 1, open lower floor's construction passageway; the soluble ball is dropped on the releasing packer 5 by pumping, the releasing device of the releasing packer 5 is started by continuous pressure, then an oil pipe connected with a fracturing string and a releasing joint of the releasing packer 5 are lifted, then first-layer fracturing is carried out, the soluble ball is dropped on the lowest-layer fracturing sliding sleeve 3 by pumping, the fracturing sliding sleeve 3 is opened by pumping after the soluble ball is pumped in place, a lower-layer construction channel is blocked, fracturing fluid is ensured to enter a second layer, and then second-layer fracturing is carried out; and sequentially completing the multi-layer fracturing construction, lifting and unsealing the lower fishing drilling tool after the completion, and taking out the fracturing string.
The utility model discloses an oil pipe puts down the fracturing string target zone perforation section position, the fracturing sliding sleeve switch is opened in grades to the soluble ball of appointed specification of pumping, realize the seat seal, open the passageway of pit shaft and reservoir, lose the fracturing string assigned position, the motionless fracturing string is process flows such as layering volume fracturing step by step, and lift through fishing tool after the fracturing, play the fracturing string, thereby furthest improves the measure well construction discharge capacity of 4 cun half sleeve pipe completions, the single-section discharge capacity can reach 4m3More than min.
The utility model discloses the fracturing string can realize 4 cun half sleeve pipe layering volume fracturing of directional well, single section construction discharge capacity 4m3More than min, the optical casing volume fracturing and the layered fine fracturing are combined to be integrated into a fixed pipe column layered volume fracturing drilling tool, the process is strong in pertinence, and the problem of effective use of a thick oil layer which is developed by a 4-inch half-small casing completion and a separation interlayer is solved; the utility model discloses a 4 very little half sleeve pipe layering fracturing string simple structure, safe and reliable more has filled including the blank of the layering volume fracturing technique of footpath 101.6 mm's little cased well, has further shortened construction cycle.
Although 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, and that the scope of the invention is defined by the appended claims.
Claims (5)
1. The utility model provides a 4 cun half sleeve pipe layering fracturing string which characterized in that: comprises a constant pressure sliding sleeve (1), a packing assembly, a hydraulic anchor (4), a releasing packer (5) and a connecting pipe, wherein the number of the packing components is multiple, the connecting pipes comprise a first connecting pipe (6), a second connecting pipe (7) and a third connecting pipe (8), wherein a plurality of second connecting pipes (7) are arranged, the upper end of the constant pressure sliding sleeve (1) is connected with the packing component through a first connecting pipe (6), wherein the plurality of packing components are connected from bottom to top through a plurality of second connecting pipes (7) in sequence, the packing assembly at the uppermost end is connected with the hydraulic anchor (4) through a third connecting pipe (8), wherein the upper end of the hydraulic anchor (4) is connected with a releasing packer (5), the constant pressure sliding sleeve (1), the packing assembly, the hydraulic anchor (4) and the releasing packer (5) are all provided with inner through holes, wherein the diameters of the inner through holes of the packing assembly, the hydraulic anchor (4) and the releasing packer (5) are all larger than the diameter of the inner through hole of the constant pressure sliding sleeve (1).
2. The 4-inch half casing separate zone fracturing string of claim 1, wherein: the packer component comprises a middle packer (2) and a fracturing sliding sleeve (3), wherein the fracturing sliding sleeve (3) is connected to the upper end of the middle packer (2), the middle packer (2) and the fracturing sliding sleeve (3) are both provided with inner through holes, and the diameter of the inner through hole of the fracturing sliding sleeve (3) is larger than or equal to that of the inner through hole of the middle packer (2).
3. The 4-inch half casing separate zone fracturing string of claim 2, wherein: the external diameter of level pressure sliding sleeve (1) is 89mm, and wherein the external diameter of middle packer (2) is 94mm, and wherein the external diameter of fracturing sliding sleeve (3) is 85mm, and wherein the external diameter of hydraulic anchor (4) is 94mm, and wherein the external diameter of packer (5) is 94mm, the interior through-hole diameter of packer (5) is 31mm, the interior through-hole diameter of middle packer (2) is 35mm ≦ d <42mm, and wherein the interior through-hole diameter of a plurality of middle packers (2) increases from bottom to top step by step.
4. The 4-inch half casing separate zone fracturing string of claim 3, wherein: the diameter of the inner through hole before the constant pressure sliding sleeve (1) is pressed and opened is 25mm, and the diameter of the inner through hole after the constant pressure sliding sleeve is pressed and opened is 35 mm.
5. The 4-inch half casing separate zone fracturing string of claim 3, wherein: the middle packer (2) is a Y341 packer, the releasing packer (5) is a Y445 releasing packer, and the diameter of an inner through hole of the releasing packer (5) after releasing is 42 mm.
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| CN201920357075.3U CN210068120U (en) | 2019-03-20 | 2019-03-20 | 4-inch half-casing separate-layer fracturing string |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915097A (en) * | 2019-03-20 | 2019-06-21 | 中国石油天然气股份有限公司 | 4 cun of half-covering tube layered fracturing pipe strings of one kind and fracturing process |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915097A (en) * | 2019-03-20 | 2019-06-21 | 中国石油天然气股份有限公司 | 4 cun of half-covering tube layered fracturing pipe strings of one kind and fracturing process |
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