CN111810106B - Three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method - Google Patents

Three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method Download PDF

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Publication number
CN111810106B
CN111810106B CN202010777623.5A CN202010777623A CN111810106B CN 111810106 B CN111810106 B CN 111810106B CN 202010777623 A CN202010777623 A CN 202010777623A CN 111810106 B CN111810106 B CN 111810106B
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inch
pipe
tool
inch half
well
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CN111810106A (en
Inventor
常笃
齐银
苏良银
董奇
汪澜
刘兴银
任勇
赵广民
郑波
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/01Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for anchoring the tools or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/261Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation

Abstract

The invention discloses a three-inch half-slim hole sidetracking horizontal well efficient staged fracturing method, which comprises the following steps of: step 1), a three-inch half-liner suspension cementing assembly is put into a sidetrack horizontal borehole and cemented; step 2), inserting the upper three-inch and half-tool oil pipe into the upper end of the three-inch and half-tail pipe suspension well cementation assembly; step 3), carrying out first-stage perforation; step 4), taking the three-inch half full-bore diameter obtained in the step 2) as a fracturing string, and performing first-stage fracturing construction; step 5) setting a small-diameter soluble bridge plug without blowout and well washing after the first-stage fracturing construction; step 6), performing second-stage perforation by adopting a hydraulic pumping mode; step 7), putting a soluble ball to seal the small-diameter soluble bridge plug in the step 5); step 8), performing second-stage fracturing construction by using the three-inch half full-diameter upper part of the small-diameter soluble bridge plug as a fracturing string; step 9) repeating the step 5) -8), and completing all staged fracturing reconstruction; step 10), open-flow backwashing; and step 11) putting a pump down for production.

Description

Three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method
Technical Field
The invention belongs to the technical field of oilfield fracturing, and particularly relates to a three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method.
Background
The sidetracking horizontal well can effectively increase the single well control reserve, the proportion of the foreign sidetracking horizontal well is 65%, compared with a directional well, the sidetracking horizontal well has the advantages of large oil layer contact area, large modification volume, high single well yield and the like, and in order to further improve the yield of the sidetracking single well, promote the sidetracking comprehensive benefit, explore the feasibility of the sidetracking horizontal well for excavating the residual oil, perfect the oilfield sidetracking technical series and develop the technical test of the sidetracking horizontal well. In order to protect the old casing at the upper part of the sidetracking horizontal well, the conventional fracturing adopts a single upper seal and small-diameter soluble bridge plug fracturing process, taking 4 sections of fracturing as an example, the working procedures are as follows:
the method comprises the steps of well dredging and well washing → the first section of a tubing transmission perforation 1 → the first section of a lower fracturing string fracturing → well shut-in and blowout-off and backwashing → a tubing string sand washing to a manual well bottom → a tubing transmission soluble bridge plug to plug the first section 1 → the second section of the tubing transmission perforation → soluble ball throwing → lower single upper fracturing string → 2 fracturing string fracturing construction 2 → well shut-in, blowout-off and sand washing of the tubing string → tubing transmission soluble bridge plug to plug the second section of the tubing transmission perforation 3 → soluble ball throwing → lower single upper fracturing string → 3 fracturing construction 3 → well shut-in, blowout-off and sand washing of the tubing string → tubing transmission layer 3 → 4 tubing transmission perforation 4 → soluble ball throwing → lower single upper fracturing string → 4 fracturing string fracturing construction 4 fracturing string 24 hours later than well shut-in, blowout → sand washing of the tubing string, bridge plug position → suction and sand washing of the tubing string, and sand throwing.
Starting from the well cleaning, 32 drilling trips are required, the fracturing construction period is 15-20 days, if a fishable bridge plug is adopted, the working procedures are further increased, the construction efficiency of the existing fracturing method is low, the working procedures are complex, the cost is high, and the popularization and application of the sidetracking horizontal well are seriously influenced. Therefore, a new process and a new method for improving the staged fracturing construction efficiency of the sidetracking horizontal well are needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the high-efficiency staged fracturing method for the sidetracking horizontal well of the three-inch half-slim well, and solves the problems that in the prior art, the tripping times are large, the fracturing construction period is long, the fracturing method is low in construction efficiency, complex in process, high in cost, and the popularization and application of the sidetracking horizontal well are seriously influenced.
In order to solve the technical problem, the technical scheme of the invention is as follows: a three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method comprises the following steps:
step 1) putting a three-inch half-liner suspended well cementation assembly into a sidetrack horizontal borehole, and completing well cementation operation;
step 2), inserting the upper three-inch half tool oil pipe into the upper end of the three-inch half tail pipe suspension well cementation assembly, and anchoring and sealing the inserted upper three-inch half tool oil pipe to obtain a three-inch half full-bore tubular column in the shaft;
step 3) carrying out first-section perforation by adopting a one-inch nine-oil-pipe transmission perforating gun mode;
step 4), taking the three-inch half full-bore pipe column in the step 2) as a fracturing pipe column, and performing first-stage fracturing construction;
step 5) no spraying and well washing is carried out after the first-stage fracturing construction, and a small-diameter soluble bridge plug and a setting tool are lowered in a hydraulic pumping mode to set the small-diameter soluble bridge plug;
step 6) performing second-stage perforation by adopting a hydraulic pumping mode;
step 7) feeding a soluble ball to seal the small-diameter soluble bridge plug in the step 5), so as to realize interval sealing between the first section of perforation and the second section of perforation;
step 8), performing second-stage fracturing construction by using a three-inch half full-bore pipe column on the upper part of the small-diameter soluble bridge plug as a fracturing pipe column;
step 9) repeating the step 5) -8), and completing all staged fracturing reconstruction;
step 10), open-flow backwashing, and taking out a three-inch and half-tool oil pipe inserted into the upper part of a three-inch and half-tail pipe suspension well cementation assembly;
and step 11) putting a pump down for production.
Preferably, the three-inch half-liner suspended well cementation assembly in the step 1) comprises a fracturing type tieback hanger, a lower three-inch half-tool oil pipe and a lower circulating tool, wherein the lower end of the fracturing type tieback hanger is connected with the lower three-inch half-tool oil pipe, and the lower end of the lower three-inch half-tool oil pipe is connected with the lower circulating tool; and after the sidetrack horizontal well is formed, the three-inch half tail pipe suspension well cementation assembly is put into the well from the well shaft, and cement slurry is filled in a gap between the well wall and the three-inch half tail pipe suspension well cementation assembly after the lower circulating tool is put in place, so that well cementation operation is completed.
The fracturing type tieback hanger is formed by sequentially connecting a releasing joint, a tieback cylinder, a hanging slip and a short sleeve from top to bottom, wherein the lower end of the short sleeve is connected with the upper end of a lower three-inch half-tool oil pipe, the outer diameter of the tieback cylinder is 113mm, and the inner diameter of the tieback cylinder is 97 mm; connecting a release through an oil pipe, then enabling a three-inch half-tail-pipe suspension well cementation assembly to enter from a shaft through the release connection release joint, after a lower circulating tool is put in place, fixing the three-inch half-tail-pipe suspension well cementation assembly in the shaft through a suspension slip, then controlling the release joint to be separated from a tie-back cylinder, taking out the release joint, then filling cement slurry in a gap between a well wall and the three-inch half-tail-pipe suspension well cementation assembly, then putting a drill pipe rubber plug into the well cementation operation, and enabling the tie-back cylinder to be used for enabling the oil pipe of the upper three-inch half tool in the step 2) to be inserted into the tie-back cylinder.
Preferably, the lower circulating tool is formed by connecting a pressure holding ball seat, a first check valve, a second check valve, a circulating short section and a guide shoe from top to bottom in sequence, wherein the upper end of the pressure holding ball seat is connected with the lower end of the lower three-inch half tool oil pipe; during well cementation, a drill rod rubber plug enters a tieback cylinder through a well mouth and continues to descend, when the drill rod rubber plug and a hollow rubber plug in a short sleeve reach a suppressed ball seat, well cementation is finished, the first check valve and the second check valve are used for preventing cement outside the pipe column from flowing back into the pipe column, the circulation nipple is used for enabling the cement to enter a channel between a well wall and an annular space of the pipe column from the pipe column in the well cementation process, circular well washing can also be carried out when the pipe column is blocked in the process of drilling down, and the guide shoe is used for smooth running of a three-inch and half-tail-pipe suspension well cementation assembly.
Preferably, step 2) middle upper portion three cun half instrument oil pipe passes through the insert tube rotation and inserts in the tieback section of thick bamboo, and the internal diameter of insert tube is 76mm, three cun half instrument oil pipes in upper portion lock after inserting the tieback section of thick bamboo through the insert tube, and the tieback section of thick bamboo internal diameter is 76mm after the locking, three cun half instrument oil pipes in upper portion insert the tieback section of thick bamboo in form the half full latus rectum tubular column of three cun in the pit shaft, but three cun half full latus rectum tubular columns from lower supreme three cun half instrument oil pipes in lower part, the formula of fracturing tieback hanger, insert tube and the three cun half instrument oil pipes in upper portion to the well head in proper order, and the internal diameter of three cun half full latus rectum tubular columns is 76 mm.
Preferably, a hydraulic anchor is further connected between the upper three-inch half tool oil pipe and the insertion pipe, the hydraulic anchor anchors and seals the upper three-inch half tool oil pipe, and the inner diameter of the hydraulic anchor is 76 mm.
Preferably, the step 3) is specifically: and connecting a one-inch nine-tool oil pipe with a perforating gun, and perforating after the perforating gun is arranged at the first section of perforation to finish the first section of perforation, wherein the perforating gun is 60-gun 60-bullet.
Preferably, the step 5) is specifically: after the first section fracturing operation is finished, connecting a bridge plug tool combination, wherein the bridge plug tool combination is connected with a cable by a small-diameter soluble bridge plug, a setting tool and a small-diameter soluble bridge plug from bottom to top, wherein the cable is connected to a wellhead, and after the bridge plug tool combination is arranged in a shaft, the shaft is internally provided with 0.3-0.5 m 3 Injecting the small-diameter soluble bridge plug to the upper part of the first section of perforation by a displacement pump at the time of min, connecting an electric signal on the ground to complete the separation between the small-diameter soluble bridge plug and a setting tool, realizing the setting of the small-diameter soluble bridge plug and sealing the first section of perforation, and pulling out the setting tool after the setting of the small-diameter soluble bridge plug is completed, wherein the outer diameter of the small-diameter soluble bridge plug is 70mm, the inner diameter of the small-diameter soluble bridge plug is 25mm, the small-diameter soluble bridge plug begins to dissolve within 24 hours at the temperature of 60 ℃, and the pressure is 70 MPa.
Preferably, the step 7) is specifically: putting soluble balls at the well mouth of the three-inch half full-drift-diameter tubular column at the distance of 0.3-0.5 m 3 And injecting a soluble ball to the position of a central hole of the small-diameter soluble bridge plug by a displacement pump at/min to realize the interval sealing between the first section of perforation and the second section of perforation, wherein the outer diameter of the soluble ball is 35mm, and the soluble ball begins to dissolve in 8 hours at the temperature of 60 ℃.
Preferably, in the step 10), the upper three-inch half tool oil pipe inserted into the three-inch half liner suspended well cementation assembly is extracted in a rotating and lifting mode.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a high-efficiency staged fracturing method for a three-inch half-small well sidetracking horizontal well, which comprises the steps of putting a fracturing type tieback hanger into a lower three-inch half tool oil pipe when suspending a well cementation to finish the well cementation operation, inserting an upper three-inch half tool oil pipe into the fracturing type tieback hanger during fracturing, anchoring and sealing the inserted upper three-inch half tool oil pipe to realize three-inch half full-diameter of a whole well, performing staged fracturing construction by pumping a small-diameter bridge plug through hydraulic power, rotationally lifting and taking out the inserted upper three-inch half tool oil pipe after fracturing is finished, putting a pump into production, solving the problems that fracturing construction of the three-inch half-small well sidetracking horizontal well needs to repeatedly pull down a fracturing string, release back flushing after each stage of fracturing, repeatedly replacing a sand flushing string and the like to seriously affect the construction efficiency, and realizing the full-diameter high-pressure staged fracturing of the three-inch half-small well sidetracking horizontal well due to the fact that an old casing pipe at the upper part of a sidetracking well cannot bear pressure, in the operation process, the fracturing string is not pulled down, the well is not flushed, the drilling-out times are few, the construction efficiency is greatly improved, the fracturing period is shortened, the construction cost is reduced, and the labor intensity of personnel is reduced;
(2) the fracturing type tieback hanger is provided with a release joint, a tieback cylinder, a hanging slip and a short sleeve, wherein the release joint is connected with the release joint to enable the fracturing type tieback hanger to be put in, the tieback cylinder can be used for enabling an upper three-inch half tool oil pipe to be inserted into the tieback cylinder, the hanging slip fixes the fracturing type tieback hanger in a shaft, the short sleeve is connected with a lower three-inch half tool oil pipe, and the upper three-inch half tool oil pipe is connected with the lower three-inch half tool oil pipe through the increase of the fracturing type tieback hanger, so that a three-inch half full-diameter of a whole well is formed, the shaft is rebuilt, the bearing capacity is improved, and high-bearing continuous pressure segmented fracturing can be carried out;
(3) according to the invention, the upper three-inch half tool oil pipe is rotatably inserted into the tieback cylinder through the insertion pipe, the hydraulic anchor is connected between the upper three-inch half tool oil pipe and the insertion pipe, the insertion pipe enables the upper three-inch half tool oil pipe to be smoothly inserted into the tieback cylinder, and the hydraulic anchor can anchor and seal the upper three-inch half tool oil pipe, so that the three-inch half full-diameter connection of the whole well is fastened, the disconnection or the movement is avoided, and the construction efficiency of high-pressure continuous pressure staged fracturing is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a fracturing type tieback hanger of a three-inch half-slim hole sidetracking horizontal well efficient staged fracturing method of the invention;
FIG. 2 is a schematic structural diagram of a lower circulation tool of the three-inch half-slim hole sidetrack horizontal well high-efficiency staged fracturing method of the invention;
FIG. 3 is a schematic structural diagram of an insert pipe and a hydraulic anchor of the three-inch half-slim hole sidetracking horizontal well efficient staged fracturing method.
1. A fracturing type tieback hanger, 2, a lower circulating tool, 3, an insert pipe and 4-a hydraulic anchor;
1-1, a releasing joint, 1-2, a tieback cylinder, 1-3, a hanging slip, 1-4, a short sleeve, 1-5 and a drill rod rubber plug;
2-1 parts of a pressure building ball seat, 2-2 parts of a first check valve, 2-3 parts of a second check valve, 2-4 parts of a circulating short section, 2-5 parts of a guide shoe.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other embodiments disclosed herein are illustrative only and are not intended to limit the scope of the invention, which is defined by the claims, since the scope of the invention is not limited by the specific structures, proportions, and dimensions, or otherwise, unless otherwise specified, since various modifications, changes in the proportions and variations thereof, can be made by those skilled in the art without departing from the spirit and scope of the invention.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
The invention discloses a three-inch half-slim hole sidetracking horizontal well efficient staged fracturing method, which comprises the following steps of:
step 1) putting a three-inch half-liner suspended well cementation assembly into a sidetrack horizontal borehole, and completing well cementation operation;
step 2), inserting an upper three-inch half tool oil pipe into the upper end of the three-inch half tail pipe suspension well cementation assembly, and anchoring and sealing the inserted upper three-inch half tool oil pipe to obtain a three-inch half full-bore pipe column in the shaft;
step 3) carrying out first-stage perforation by adopting a one-inch nine-oil-pipe perforating gun transmission mode;
step 4), taking the three-inch half full-bore pipe column in the step 2) as a fracturing pipe column, and performing first-stage fracturing construction;
step 5) without blowout and well washing after the first-stage fracturing construction, a small-diameter soluble bridge plug and a setting tool are put in a hydraulic pumping mode, and the small-diameter soluble bridge plug is set;
step 6) performing second-stage perforation by adopting a hydraulic pumping mode;
step 7), putting a soluble ball to seal the small-diameter soluble bridge plug in the step 5), and realizing interval sealing between the first section of perforation and the second section of perforation;
step 8), performing second-stage fracturing construction by using a three-inch half full-bore pipe column on the upper part of the small-diameter soluble bridge plug as a fracturing pipe column;
step 9), repeating the step 5) -8), and completing all staged fracturing reconstruction;
step 10), open-flow backwashing, and taking out a three-inch and half-tool oil pipe inserted into the upper part of a three-inch and half-tail pipe suspension well cementation assembly;
and step 11) putting a pump down for production.
Example 2
Preferably, the three-inch half-liner suspended well cementation assembly in the step 1) comprises a fracturing type tieback hanger 1, a lower three-inch half-tool oil pipe and a lower circulating tool 2, wherein the lower end of the fracturing type tieback hanger 1 is connected with the lower three-inch half-tool oil pipe, and the lower end of the lower three-inch half-tool oil pipe is connected with the lower circulating tool 2; and after the sidetrack horizontal well is formed, the three-inch half-liner suspended well cementation assembly is put into the well from the shaft, and after the lower circulating tool 2 is put in place, cement slurry is filled in a gap between the well wall and the three-inch half-liner suspended well cementation assembly to finish well cementation operation.
Example 3
As shown in fig. 1, preferably, the fracturing type tieback hanger 1 is formed by connecting a releasing joint 1-1, a tieback cylinder 1-2, a hanging slip 1-3 and a short sleeve 1-4 from top to bottom in sequence, wherein the lower end of the short sleeve 1-4 is connected with the upper end of a three-inch and a half-inch lower tool oil pipe, the outer diameter of the tieback cylinder 1-2 is 113mm, and the inner diameter of the tieback cylinder is 97 mm; connecting a release through an oil pipe, then putting a three-inch half-tail-pipe suspension well cementation assembly into a shaft through the release connecting release joint 1-1, after a lower circulating tool 2 is put in place, fixing the three-inch half-tail-pipe suspension well cementation assembly into the shaft through a suspension slip 1-3, then controlling the release joint 1-1 to be separated from a tieback cylinder 1-2, taking out the release joint 1-1, then filling cement slurry in a gap between a well wall and the three-inch half-tail-pipe suspension well cementation assembly, then putting a drill pipe rubber plug 1-5 for well cementation, and enabling the tieback cylinder 1-2 to be used for enabling the oil pipe of the upper three-inch half tool in the step 2) to be inserted into the tieback cylinder.
Example 4
As shown in fig. 2, preferably, the lower circulation tool 2 is formed by connecting a pressure-holding ball seat 2-1, a first check valve 2-2, a second check valve 2-3, a circulation nipple 2-4 and a guide shoe 2-5 in sequence from top to bottom, wherein the upper end of the pressure-holding ball seat 2-1 is connected with the lower end of a lower three-inch half tool oil pipe, during well cementing operation, a drill rod rubber plug 1-5 is lowered into a return cylinder 1-2 through a well head and continues to descend, when the drill rod rubber plug 1-5 and a hollow rubber plug in a short sleeve 1-4 reach the pressure-holding check ball seat 2-1, well cementing is finished, the first check valve 2-2 and the second check valve 2-3 are used for preventing a cement nipple outside the pipe column from flowing back into the pipe column, the circulation 2-4 is used for enabling cement to enter a channel between the well wall and an annular space of the pipe column from the pipe column during the well cementing operation, and the guide shoe 2-5 is used for successfully running in a three-inch and half-tail-pipe suspended well cementation assembly.
Example 5
As shown in fig. 3, preferably, in step 2), the middle-upper three-inch half tool oil pipe is rotatably inserted into the tieback cylinder 1-2 through the insertion pipe 3, the inner diameter of the insertion pipe 3 is 76mm, the upper three-inch half tool oil pipe is inserted into the tieback cylinder 1-2 through the insertion pipe 3 and then locked, the inner diameter of the tieback cylinder 1-2 after locking is 76mm, the upper three-inch half tool oil pipe is inserted into the tieback cylinder 1-2 to form a three-inch half full-diameter tubular column in the wellbore, the three-inch half full-diameter tubular column sequentially comprises the lower three-inch half tool oil pipe, the fracturing type tieback hanger 1, the insertion pipe 3 and the upper three-inch half tool oil pipe from bottom to top to the wellhead, and the inner diameter of the three-inch half full-diameter tubular column is 76 mm.
The steel grade of the upper and lower three-inch half tool oil pipe is N80, preferably, the insert pipe can be formed by connecting a spiral slip and a sealing assembly, the anchoring adopts the spiral slip anchoring, the sealing adopts a plurality of groups of sealing assemblies for sealing, and the pressure in the pipe is 70MPaa after anchoring and sealing.
As shown in fig. 3, a hydraulic anchor 4 is preferably connected between the upper three-inch half tool pipe and the insertion pipe 3, the hydraulic anchor 4 anchors and seals the upper three-inch half tool pipe, and the inner diameter of the hydraulic anchor 4 is 76 mm.
Example 6
Preferably, the step 3) is specifically: and connecting a one-inch nine-tool oil pipe with a perforating gun, and perforating after the perforating gun is arranged at the first section of perforation to finish the first section of perforation, wherein the perforating gun is 60-gun 60-bullet.
Preferably, the step 5) is specifically: after the first section of fracturing operation, connecting a bridge plug tool combination, wherein the bridge plug tool combination is connected with a cable from bottom to top through a small-diameter soluble bridge plug, a setting tool and the cable, wherein the cable is connected to a wellhead, and after the bridge plug tool combination is arranged in a shaft, the shaft is internally provided with 0.3-0.5 m 3 Injecting a small-diameter soluble bridge plug to the upper part of the first section of perforation by a displacement pump at the time of min, connecting an electric signal on the ground to complete the separation between the small-diameter soluble bridge plug and a setting tool, realizing the setting of the small-diameter soluble bridge plug and sealing the first section of perforation, and pulling out the setting tool after the setting of the small-diameter soluble bridge plug is completedThe external diameter of the bridge plug is 70mm, the internal diameter is 25mm, the bridge plug begins to dissolve in 24 hours at the temperature of 60 ℃, and the pressure is 70 MPa.
Preferably, the step 7) specifically comprises: putting soluble balls into the well mouth of the three-inch half full-bore tubular column at the distance of 0.3-0.5 m 3 And injecting a soluble ball to the central hole position of the small-diameter soluble bridge plug by a displacement pump at/min to realize the interval sealing between the first section of perforation and the second section of perforation, wherein the outer diameter of the soluble ball is 35mm, and the soluble ball starts to dissolve after 8 hours at the temperature of 60 ℃.
Preferably, in the step 10), the upper three-inch half tool oil pipe inserted into the three-inch half liner suspended cementing assembly is extracted in a rotating and lifting manner.
Example 7
The embodiment provides a three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method, which takes four stages of fracturing as an example and comprises the following steps:
step 1) putting the three-inch half-liner suspended well cementation assembly into a sidetrack horizontal borehole, and completing well cementation operation.
After the sidetracking horizontal well hole is formed, sequentially descending from bottom to top in the well shaft: a lower circulating tool 2, a lower three-inch and half-tool oil pipe and a fracturing type tieback hanger 1; the method comprises the steps of connecting a release through a cable, then putting a three-inch half-tail-pipe suspension well cementation assembly into a shaft through a release connection release joint 1-1, fixing the three-inch half-tail-pipe suspension well cementation assembly into the shaft through a suspension slip 1-3 after a lower circulation tool 2 is put in place, then controlling the release joint 1-1 to be separated from a tieback cylinder 1-2, taking out the release joint 1-1, then filling cement slurry into a gap between the wall of the well and the three-inch half-tail-pipe suspension well cementation assembly, and then putting a drill pipe rubber plug 1-5 into the well cementation assembly to perform well cementation operation.
Step 2), inserting the upper three-inch half tool oil pipe into the upper end of the three-inch half tail pipe suspension well cementation assembly, and anchoring and sealing the inserted upper three-inch half tool oil pipe to realize a three-inch half full-bore tubular column in a shaft;
combining tie-back drilling tools from top to bottom: and (3) putting a tie-back drilling tool into the shaft, ensuring that the insert pipe is inserted into a tie-back barrel 1-2 of the fracturing type tie-back hanger in the shaft, clockwise rotating the tie-back drilling tool after the tie-back drilling tool is in place, and locking the tie-back barrel 1-2 after the upper three-inch half tool oil pipe is inserted into the tie-back barrel 1-2 through the insert pipe to ensure that the formed new well pipe columns have consistent inner diameters, wherein the pipe columns are used as subsequent fracturing pipe columns (three-inch half full-path pipe columns), and the three-inch half full-path pipe columns comprise a lower three-inch half tool oil pipe, a fracturing type tie-back hanger and an upper three-inch half tool oil pipe from bottom to top to a well head.
Step 3) carrying out first-section perforation by adopting a one-inch nine-oil-pipe transmission perforating gun mode;
combined perforating tool (from bottom to top): and (3) putting the perforating gun and a nine-inch tool oil pipe to a wellhead, and perforating after the perforating gun is put into the first section of perforation needing fracturing to complete the first section of perforation, wherein the perforating gun is 60-gun 60-bullet.
Step 4), taking the three-inch half full-bore pipe column in the step 2) as a fracturing pipe column, and performing first-stage fracturing construction;
taking a formed tubular column structure of a shaft as a fracturing tubular column (from bottom to top): and (4) connecting the lower three-inch and half tool oil pipe, the fracturing type tieback hanger and the upper three-inch and half tool oil pipe to a wellhead to perform first-stage fracturing.
Step 5) without blowout and well washing after the first-stage fracturing construction, a small-diameter soluble bridge plug and a special bridge plug setting tool are put in a hydraulic pumping mode to set the small-diameter soluble bridge plug;
after the first stage of fracturing operation is finished, connecting a bridge plug tool combination (from bottom to top): the small-diameter soluble bridge plug, the setting tool and the cable are conveyed to a wellhead, and after the bridge plug tool is combined into a well, the diameter of the shaft is 0.3-0.5 m 3 Injecting the bridge plug to the upper part of the first section of the perforation section by a displacement pump at the min, communicating an electric signal on the ground to complete the separation between the small-diameter soluble bridge plug and the setting tool, realizing the setting of the small-diameter soluble bridge plug and sealing the first section of the perforation section, and pulling out the setting tool after the setting of the small-diameter soluble bridge plug is completed, wherein the outer diameter of the small-diameter soluble bridge plug is 70mm, the inner diameter of the small-diameter soluble bridge plug is 25mm, the small-diameter soluble bridge plug starts to dissolve within 24 hours at the temperature of 60 ℃, and the pressure is 70 MPa.
Step 6) performing second-stage perforation by adopting a hydraulic pumping mode;
connection ofPerforating gun string tool combination (from bottom to top): the perforating gun string and the cable are conveyed to a wellhead, and after the perforating gun string tool is combined into a well, the inside of a shaft is 0.3-0.5 m 3 And (4) the displacement pump injection hole gun is connected to the second section, and an electric signal is communicated on the ground to complete the second section of underground perforation.
Step 7) casting a soluble ball to plug the bridge plug, and realizing the interval sealing between the 1 st perforation section and the 2 nd perforation section;
soluble balls with the diameter of 35mm are put into the shaft, and the interval sealing between the first section of perforation and the second section of perforation is realized.
Step 8), performing second-stage fracturing construction by using a three-inch half full-bore pipe column on the upper part of the small-diameter soluble bridge plug as a fracturing pipe column;
taking a formed tubular column structure of a shaft as a fracturing tubular column (from bottom to top): and the lower three-inch half tool oil pipe, the fracturing type tieback hanger and the upper three-inch half tool oil pipe are connected to the wellhead to perform second-section fracturing, and the subsequent 3 rd section and the subsequent 4 th section both adopt the existing shaft pipe column structure.
Step 9) repeating the steps 5, 6, 7 and 8 to complete all staged fracturing reconstruction;
after the second-stage fracturing is completed, repeating the step 5, and putting a bridge plug tool combination to the upper part of the second-stage perforation section and setting the bridge plug; repeating the step 6 to finish the third section of perforation; repeating the step 7 to finish the ball injection to seal the bridge plug, and realizing the packing between the third section and the second section; repeating step 8 can perform a third stage of fracturing;
and similarly, continuously repeating the steps 5, 6, 7 and 8 to finish the fourth stage of fracturing construction.
Step 10), open-flow backwashing, and taking out a three-inch and half-tool oil pipe inserted into the upper part of a three-inch and half-tail pipe suspension well cementation assembly;
and after the fourth stage of fracturing operation is completed, opening a well mouth for blowout, anticlockwise rotating the upper three-inch half tool oil pipe on the ground, lifting the oil pipe column, taking the tie-back drilling tool out of the fracturing type tie-back hanger 1 to the ground, and recovering the original sidetracking well barrel structure.
And step 11) putting a pump down for production.
The fracturing method only needs 2 trips and the construction period is 3-5 days, the existing fracturing method needs 32 trips and the fracturing construction period is 15-20 days.
The working principle of the invention is as follows:
the invention provides a high-efficiency staged fracturing method for a three-inch half-small well sidetracking horizontal well, which comprises the steps of putting a fracturing type tieback hanger into a lower three-inch half tool oil pipe when suspending a well cementation to finish the well cementation operation, inserting an upper three-inch half tool oil pipe into the fracturing type tieback hanger during fracturing, anchoring and sealing the inserted upper three-inch half tool oil pipe to realize three-inch half full-diameter of a whole well, performing staged fracturing construction by pumping a small-diameter bridge plug through hydraulic power, rotationally lifting and taking out the inserted upper three-inch half tool oil pipe after fracturing is finished, putting a pump into production, solving the problems that fracturing construction of the three-inch half-small well sidetracking horizontal well needs to repeatedly pull down a fracturing string, release back flushing after each stage of fracturing, repeatedly replacing a sand flushing string and the like to seriously affect the construction efficiency, and realizing the full-diameter high-pressure staged fracturing of the three-inch half-small well sidetracking horizontal well due to the fact that an old casing pipe at the upper part of a sidetracking well cannot bear pressure, the fracturing string is not pulled down in the operation process, the well is not flushed through open flow, the drilling pulling-down times are few, the construction efficiency is greatly improved, the fracturing period is shortened, the construction cost is reduced, and the labor intensity of personnel is reduced.
The fracturing type tieback hanger is provided with a release joint, a tieback cylinder, a hanging slip and a short sleeve, wherein the release joint is connected with the release joint to enable the fracturing type tieback hanger to be put in, the tieback cylinder can be used for enabling an upper three-inch half tool oil pipe to be inserted into the tieback cylinder, the hanging slip fixes the fracturing type tieback hanger in a shaft, the short sleeve is connected with a lower three-inch half tool oil pipe, and the upper three-inch half tool oil pipe is connected with the lower three-inch half tool oil pipe through the addition of the fracturing type tieback hanger, so that a three-inch half full-diameter of a whole well is formed, the shaft is rebuilt, the bearing capacity is improved, and high-bearing continuous pressure segmented fracturing can be carried out.
According to the invention, the upper three-inch half tool oil pipe is rotatably inserted into the tieback cylinder through the insertion pipe, the hydraulic anchor is connected between the upper three-inch half tool oil pipe and the insertion pipe, the insertion pipe enables the upper three-inch half tool oil pipe to be smoothly inserted into the tieback cylinder, and the hydraulic anchor can anchor and seal the upper three-inch half tool oil pipe, so that the three-inch half full-diameter connection of the whole well is fastened, the disconnection or the movement is avoided, and the construction efficiency of high-pressure continuous pressure staged fracturing is ensured.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims (8)

1. The high-efficiency staged fracturing method for the three-inch half-slim hole sidetrack horizontal well is characterized by comprising the following steps of:
step 1), a three-inch semi-tail pipe suspension well cementation assembly is put into a sidetrack horizontal well, and well cementation operation is completed;
step 2), inserting the upper three-inch half tool oil pipe into the upper end of the three-inch half tail pipe suspension well cementation assembly, and anchoring and sealing the inserted upper three-inch half tool oil pipe to obtain a three-inch half full-bore tubular column in the shaft;
step 3) carrying out first-section perforation by adopting a one-inch nine-oil-pipe transmission perforating gun mode;
step 4), taking the three-inch half full-bore pipe column in the step 2) as a fracturing pipe column, and performing first-stage fracturing construction;
step 5) without blowout and well washing after the first-stage fracturing construction, a small-diameter soluble bridge plug and a setting tool are put in a hydraulic pumping mode, and the small-diameter soluble bridge plug is set;
step 6) performing second-stage perforation by adopting a hydraulic pumping mode;
step 7) feeding a soluble ball to seal the small-diameter soluble bridge plug in the step 5), so as to realize interval sealing between the first section of perforation and the second section of perforation;
step 8), performing second-stage fracturing construction by using a three-inch half full-bore pipe column on the upper part of the small-diameter soluble bridge plug as a fracturing pipe column;
step 9), repeating the step 5) -8), and completing all staged fracturing reconstruction;
step 10), open-flow backwashing, and taking out a three-inch and half-tool oil pipe inserted into the upper part of a three-inch and half-tail pipe suspension well cementation assembly;
step 11), putting a pump down for production;
the three-inch half-liner suspended well cementation assembly in the step 1) comprises a fracturing type tieback hanger (1), a lower three-inch half-tool oil pipe and a lower circulating tool (2), wherein the lower end of the fracturing type tieback hanger (1) is connected with the lower three-inch half-tool oil pipe, and the lower end of the lower three-inch half-tool oil pipe is connected with the lower circulating tool (2); after a sidetrack horizontal well hole is formed, the three-inch half tail pipe suspension well cementation assembly is put into the well from the well shaft, and after the lower circulating tool (2) is put in place, cement slurry is filled in a gap between the well wall and the three-inch half tail pipe suspension well cementation assembly to complete well cementation operation;
the fracturing type tieback hanger (1) is formed by sequentially connecting a releasing joint (1-1), a tieback cylinder (1-2), a hanging slip (1-3) and a short sleeve (1-4) from top to bottom, the lower end of the short sleeve (1-4) is connected with the upper end of a three-inch and a half-inch tool oil pipe on the lower portion, the outer diameter of the tieback cylinder (1-2) is 113mm, and the inner diameter of the tieback cylinder is 97 mm; connecting a release through an oil pipe, then putting a three-inch half-tail-pipe suspension well cementation assembly into a shaft through the release connecting release joint (1-1), fixing the three-inch half-tail-pipe suspension well cementation assembly into the shaft by using a suspension slip (1-3) after a lower circulating tool (2) is put in place, then controlling the release joint (1-1) to be separated from a tieback cylinder (1-2), taking out the release joint (1-1), then filling cement slurry in a gap between the shaft wall and the three-inch half-tail-pipe suspension well cementation assembly, and then putting a drill pipe rubber plug (1-5) into the hole for well cementation, wherein the tieback cylinder (1-2) is used for inserting the oil pipe of the upper three-inch half tool in the step 2).
2. The efficient staged fracturing method for the three-inch half slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: the lower circulating tool (2) is formed by connecting a pressure-holding ball seat (2-1), a first check valve (2-2), a second check valve (2-3), a circulating short section (2-4) and a guide shoe (2-5) from top to bottom in sequence, wherein the upper end of the pressure-holding ball seat (2-1) is connected with the lower end of a lower three-inch half tool oil pipe; during well cementation, a drill rod rubber plug (1-5) is lowered into a tieback cylinder (1-2) through a well mouth and continues to descend, when the drill rod rubber plug (1-5) and a hollow rubber plug in a short sleeve (1-4) reach a pressure-holding ball seat (2-1), well cementation is finished, a first check valve (2-2) and a second check valve (2-3) are used for preventing cement outside a pipe column from flowing back into the pipe column, a circulating nipple (2-4) is used for enabling the cement to enter a channel between a well wall and an annular space of the pipe column from the inside of the pipe column in the well cementation process and also can be used for circularly washing a well when the pipe column is blocked in the well cementation process, and a guide shoe (2-5) is used for smoothly lowering a three-inch half-tail pipe suspension well cementation assembly.
3. The efficient staged fracturing method for the three-inch half slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: step 2) middle and upper three-inch half tool oil pipe is inserted into the tieback cylinder (1-2) through the inserting pipe (3) in a rotating mode, the inner diameter of the inserting pipe (3) is 76mm, the upper three-inch half tool oil pipe is locked after being inserted into the tieback cylinder (1-2) through the inserting pipe (3), the inner diameter of the tieback cylinder (1-2) is 76mm after being locked, the upper three-inch half tool oil pipe is inserted into the tieback cylinder (1-2) to form a three-inch half full-bore tubular column in a shaft, the three-inch half full-bore tubular column sequentially comprises a lower three-inch half tool oil pipe, a fracturing type tieback hanger (1), the inserting pipe (3) and the upper three-inch half tool oil pipe to a well head from bottom to top, and the inner diameter of the three-inch half full-bore tubular column is 76 mm.
4. The high-efficiency staged fracturing method for the three-inch half-slim borehole sidetrack horizontal well according to claim 3, characterized by comprising the following steps: and a hydraulic anchor (4) is further connected between the upper three-inch half tool oil pipe and the inserting pipe (3), the hydraulic anchor (4) anchors the upper three-inch half tool oil pipe in a sealing manner, and the inner diameter of the hydraulic anchor (4) is 76 mm.
5. The high-efficiency staged fracturing method for the three-inch half-slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: the step 3) is specifically as follows: and connecting a one-inch nine-tool oil pipe with a perforating gun, and perforating after the perforating gun is arranged at the first section of perforation to finish the first section of perforation, wherein the perforating gun is 60-gun 60-bullet.
6. The high-efficiency staged fracturing method for the three-inch half-slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: the step 5) is specifically as follows: after the first section fracturing operation is finished, connecting a bridge plug tool combination, wherein the bridge plug tool combination is connected with a cable by a small-diameter soluble bridge plug, a setting tool and a small-diameter soluble bridge plug from bottom to top, wherein the cable is connected to a wellhead, and after the bridge plug tool combination is arranged in a shaft, the shaft is internally provided with 0.3-0.5 m 3 Injecting the small-diameter soluble bridge plug to the upper part of the first section of perforation by a displacement pump at the time of min, connecting an electric signal on the ground to complete the separation between the small-diameter soluble bridge plug and a setting tool, realizing the setting of the small-diameter soluble bridge plug and sealing the first section of perforation, and pulling out the setting tool after the setting of the small-diameter soluble bridge plug is completed, wherein the outer diameter of the small-diameter soluble bridge plug is 70mm, the inner diameter of the small-diameter soluble bridge plug is 25mm, the small-diameter soluble bridge plug begins to dissolve within 24 hours at the temperature of 60 ℃, and the pressure is 70 MPa.
7. The high-efficiency staged fracturing method for the three-inch half-slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: the step 7) is specifically as follows: putting soluble balls at the well mouth of the three-inch half full-drift-diameter tubular column at the distance of 0.3-0.5 m 3 And injecting a soluble ball to the position of a central hole of the small-diameter soluble bridge plug by a displacement pump at/min to realize the interval sealing between the first section of perforation and the second section of perforation, wherein the outer diameter of the soluble ball is 35mm, and the soluble ball begins to dissolve in 8 hours at the temperature of 60 ℃.
8. The high-efficiency staged fracturing method for the three-inch half-slim borehole sidetrack horizontal well according to claim 1, characterized by comprising the following steps: in the step 10), a three-inch and half-tool oil pipe inserted into the three-inch and half-tail pipe suspension well cementation assembly is taken out in a rotating and lifting mode.
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