CN111706309B - Crack initiation method for cased well - Google Patents
Crack initiation method for cased well Download PDFInfo
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- CN111706309B CN111706309B CN202010602002.3A CN202010602002A CN111706309B CN 111706309 B CN111706309 B CN 111706309B CN 202010602002 A CN202010602002 A CN 202010602002A CN 111706309 B CN111706309 B CN 111706309B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention provides a fracture initiation method of a cased well, which comprises the following specific steps: manufacturing a short sleeve with a soluble inner wall, wherein the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve; the preparation method for manufacturing the short sleeve with the soluble inner wall comprises the following steps: firstly, selecting a short sleeve with the same inner diameter as the production sleeve, then processing the inner wall of the sleeve body of the short sleeve, thinning the wall thickness of the short sleeve, and then filling the wall thickness of the short sleeve with a soluble material through a mould to form the short sleeve with a soluble inner wall, so that the inner diameter of the short sleeve with the soluble inner wall is the same as the inner diameter of the production sleeve. According to the invention, the short sleeve with the soluble inner wall is arranged on the production sleeve and is put into the storage layer, and the wall thickness of the short sleeve with the soluble inner wall becomes weak after the short sleeve with the soluble inner wall is dissolved in water, so that the short sleeve with the soluble inner wall is easy to open to form a circulation channel, and a liquid inlet channel is provided for subsequent sand adding and fracturing. The invention has simple construction and effective crack initiation, and achieves the aims of cost reduction and efficiency improvement.
Description
Technical Field
The invention belongs to the technical field of low-permeability gas reservoir transformation of oil and gas fields, and particularly relates to a fracture initiation method of a cased well.
Background
A bridge plug staged fracturing process is mainly adopted in horizontal wells and vertical wells of the Suliger gas fields at present, a flow channel of a shaft and a stratum is established in the first stage of the bridge plug staged fracturing process and is connected to a reservoir stratum transformation position of a gas layer casing pipe through a constant pressure sliding sleeve or a toe end sliding sleeve, and after well cementation is finished, a pin is broken through well mouth pressurization to open the flow channel of the shaft and the stratum, so that first stage fracturing operation is carried out.
However, the recent crack monitoring results and long-term field construction pressure data show that the constant pressure sliding sleeve, the well cementation sliding sleeve or the toe end sliding sleeve of a part of wells have the problems of failure, incapability of opening, incomplete opening and the like. Therefore, when in-site fracturing construction, a perforating team needs to be reorganized for perforation solution, the construction period is at least increased by more than 2 days, and the construction cost is increased. The external diameter of the tool string of the constant pressure sliding sleeve, the well cementation sliding sleeve or the toe end sliding sleeve is larger, the internal structure of the sliding sleeve is complex, the operation is complex, the well entry risk is large, and the well cementation risk is large. The opening pressure of the constant pressure sliding sleeve during field construction is determined according to a plurality of factors such as stratum fracture pressure, well depth, cement slurry density, circulating pressure during well cementation, density of liquid in a well before fracturing and the like, the starting pressure of the blast valve is controlled by a plurality of factors, and actual operation is complex.
Disclosure of Invention
The invention provides a method for initiating cracks of a cased well, aiming at overcoming the problems of complex working procedures, high failure rate of various sliding sleeve tools, complex tool operation and large opening pressure. The invention omits the link of continuous oil pipe transmission perforation or continuous oil pipe hydraulic sand blasting perforation in the first section, and also avoids the problem that the constant pressure sliding sleeve or the toe end sliding sleeve cannot be opened. The invention has simple construction process and crack initiation, and effectively achieves the purposes of cost reduction and efficiency improvement.
The technical scheme adopted by the invention is as follows:
a fracture initiation method for a cased well comprises the following specific steps:
manufacturing a short sleeve with a soluble inner wall, wherein the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve; the preparation method for manufacturing the short sleeve with the soluble inner wall comprises the following steps: firstly, selecting a short sleeve with the same inner diameter as that of the production sleeve, then processing the inner wall of the sleeve body of the short sleeve to thin the wall thickness of the short sleeve, and then filling the wall thickness of the short sleeve with a soluble material through a mould to form the short sleeve with a soluble inner wall, so that the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve;
secondly, a short sleeve with a soluble inner wall is put into a well section of a gas layer to be modified;
step three, cementing wells, wherein the short sleeve with the soluble inner wall meets the requirement of collision pressure;
step four, the inner wall of the short sleeve with the soluble inner wall is dissolved in 10 days at most under the action of water or completion fluid;
and fifthly, pressing the well mouth, breaking the short sleeve with the soluble inner wall at the weak wall thickness, and judging that liquid can be absorbed by the stratum into the reservoir stratum to form a fracturing channel if the discharge capacity can be established.
In the first step, the short sleeve with the soluble inner wall is 1-3m long and 5-9cm thick.
In the first step, the thickness of the soluble material accounts for 30-50% of the wall thickness of the short sleeve with the soluble inner wall; the soluble material is sleeved in the sleeve body in a cylindrical shape.
The soluble material comprises the following components in parts by weight: 40 to 90 parts of modified polyurethane-polyalkyl ester material, 5 to 18 parts of plasticizer, 5 to 10 parts of nano reinforcing material, 0.1 to 0.3 part of antioxidant and 0.5 to 1 part of lubricant.
The modified polyurethane-polyalkyl ester material is prepared by copolymerizing and polymerizing polyglycolide, polyethylene glycol and polylactide through a triblock chain extender.
In the fourth step, the inner wall of the short sleeve with the soluble inner wall is dissolved after 10 days of water at most, wherein the mineralization degree of the water is more than or equal to 5000mg/l.
In the fourth step, the completion fluid is a potassium chloride aqueous solution.
In the third step, well cementation is carried out, and the short sleeve with the soluble inner wall meets the impact pressure requirement of more than 30 MPa.
The invention has the beneficial effects that:
the short sleeve with the soluble inner wall is arranged on the production sleeve and is arranged in the storage layer, and the short sleeve with the soluble inner wall is weak in wall thickness after being dissolved in water and is easy to open to form a circulation channel so as to provide a liquid inlet channel for subsequent sand fracturing. The invention saves the link of adopting a continuous oil pipe to transmit and perforate or adopting a continuous oil pipe to hydraulically sand blast and perforate in the first section, and also avoids the problem that the constant pressure sliding sleeve or the toe end sliding sleeve cannot be opened. The invention has simple construction process and crack initiation, and effectively achieves the purposes of cost reduction and efficiency improvement. The invention has full drift diameter of the fractured and transformed shaft, and is convenient for subsequent shaft operations such as production string running, well repair and the like.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a cross-sectional view of a short sleeve with a soluble inner wall.
FIG. 2 is a schematic view of a short sleeve structure in which the inner wall is soluble during dissolution.
Fig. 3 is a schematic diagram of a short sleeve structure with a soluble inner wall after dissolution.
Fig. 4 is a structural schematic diagram of a short sleeve with a soluble inner wall after dissolution and pressing.
In the figures, the reference numbers are: 1. a sleeve body; 2. a soluble material.
Detailed Description
Example 1:
in order to overcome the problems of complex working procedures, high failure rate of various sliding sleeve tools, complex tool operation and large opening pressure, the invention provides a method for initiating cracks of a cased well as shown in figures 1-4. The invention saves the link of adopting a continuous oil pipe to transmit and perforate or adopting a continuous oil pipe to hydraulically sand blast and perforate in the first section, and also avoids the problem that the constant pressure sliding sleeve or the toe end sliding sleeve cannot be opened. The invention has simple construction process and effective crack initiation, and achieves the purposes of cost reduction and efficiency improvement.
A fracture initiation method for a cased well comprises the following specific steps:
manufacturing a short sleeve with a soluble inner wall, wherein the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve; the preparation method for manufacturing the short sleeve with the soluble inner wall comprises the following steps: firstly, selecting a short sleeve with the same inner diameter as that of a production sleeve, then processing the inner wall of a sleeve body 1 of the short sleeve to thin the wall thickness of the short sleeve, and then filling the wall thickness of the short sleeve with a soluble material 2 through a mould to form the short sleeve with a soluble inner wall, so that the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve;
secondly, a short sleeve with a soluble inner wall is put into a well section of a gas layer to be modified;
step three, cementing wells, wherein the short sleeve with the soluble inner wall meets the requirement of collision pressure;
step four, the inner wall of the short sleeve with the soluble inner wall is dissolved in 10 days at most under the action of water or completion fluid;
and fifthly, pressing the well mouth, breaking the short sleeve with the soluble inner wall at the weak wall thickness, and judging that liquid can be absorbed by the stratum into the reservoir stratum to form a fracturing channel if the discharge capacity can be established.
In the invention, the prepared soluble material is introduced into the casing mould, so that the processed thinned wall thickness is filled by the soluble material 2, thus ensuring that the inner diameter of the final short casing with the soluble inner wall is the same as that of the production casing, ensuring the full drift diameter of the shaft and facilitating the subsequent shaft operation such as production pipe column running, well repair and the like. And (3) cooling the soluble material 2 entering the die with water and air to finally form a short sleeve with a soluble inner wall with the same inner diameter as the production sleeve.
When the casing pipe adopted by the invention is used, the collision pressure required by a well mouth is 30MPa, so that the flow channel of the casing pipe and a reservoir can be opened without too much pressure at the well mouth, and the construction efficiency and the safety performance are improved.
The soluble short sleeve on the inner wall can be completely dissolved in the aqueous solution with a certain mineralization within ten days after well cementation, the wall thickness of the soluble short sleeve on the inner wall is weak after the dissolution, the weak part is easy to break under wellhead pressure to form a liquid inlet channel, a circulation channel of the sleeve and a reservoir is established, and the construction effectiveness is high.
The invention is suitable for measure reconstruction of vertical wells, directional wells and horizontal wells, and is also suitable for measure reconstruction of newly built wells and old wells. Compare in level pressure sliding sleeve, well cementation sliding sleeve or toe end sliding sleeve, this instrument external diameter is unanimous with the sleeve pipe, and inner structure is uncomplicated, the processing ease. The invention omits the procedure of adopting a continuous oil pipe to transmit and perforate in the first section, also avoids the problem that the sliding sleeve cannot be opened when a constant pressure sliding sleeve, a well cementation sliding sleeve or a toe end sliding sleeve are applied, reduces the operation difficulty and the operation cost, and improves the construction efficiency. The invention has full drift diameter of the fractured and transformed shaft, and is convenient for subsequent shaft operations such as production string running, well repair and the like.
Example 2:
based on example 1, in this example, as shown in fig. 1 and fig. 2, in the first step, the short sleeve with soluble inner wall has a length of 1-3m and a wall thickness of 5-9cm.
Preferably, the thickness of the soluble material 2 in the first step occupies 30-50% of the wall thickness of the short sleeve with the soluble inner wall; the soluble material 2 is sleeved in the sleeve body 1 in a cylindrical shape.
Preferably, the soluble material 2 consists of the following components by weight: 40 to 90 portions of modified polyurethane-polyalkyl ester material, 5 to 18 portions of plasticizer, 5 to 10 portions of nano reinforcing material, 0.1 to 0.3 portion of antioxidant and 0.5 to 1 portion of lubricant.
Preferably, the modified polyurethane-polyalkyl ester material is prepared by copolymerization polymerization of polyglycolide, polyethylene glycol and polylactide through a triblock chain extender. Further, a triblock
The chain extender is toluene diisocyanate-ethylene glycol-toluene diisocyanate.
The modified polyurethane-polyalkyl ester material is prepared by the following method:
the method comprises the following steps: proportionally adding polyethylene glycol, polyglycolide and polylactide into a reaction kettle under the protection of catalyst stannous octoate nitrogen, keeping the interior of the kettle vacuumized and ensuring the interior of the kettle to be dry through nitrogen replacement for many times, then mixing and stirring for at least 2 hours at 90 ℃ until the materials are completely dissolved, and heating to a molten state for reaction for at least 18 hours to obtain the poly (glycolide-co-polyethylene).
Step two: adding triblock chain extender and catalyst triethylene diamine into the poly (lactide-co-ethylene glycol) according to a certain proportion under the protection of nitrogen, and continuously reacting for 12-20 hours under the protection of nitrogen to obtain the modified polyurethane-polyalkyl ester material.
Further, the plasticizer is one or more of polyhydroxy fatty acid, polyethylene glycol and polytrimethylene carbonate.
Further, the nano reinforcing material is one or more of nano calcium carbonate, nano white carbon black and nano talcum powder.
Further, the antioxidant is one or more of antioxidant 1010, antioxidant 164, antioxidant 264 and antioxidant CA.
Further, the lubricant is one or more of stearic acid, paraffin, OPE wax and silicone oil.
According to the invention, soluble materials 2 with various proportions are selected according to different reservoirs to manufacture the short sleeve with soluble inner wall. The length of the short sleeve with soluble inner wall varies from one to three meters according to the requirement.
The soluble material is dissolved after the soluble short sleeve pipe meets water for less than or equal to 10 days, the mineralization degree of the water is more than or equal to 5000mg/l, and new pollution is not generated on the stratum by dissolved matters. Effectively protecting the formation environment.
Preferably, in the fourth step, the inner wall of the short sleeve with the soluble inner wall is dissolved after 10 days at most when the short sleeve with the soluble inner wall is in water, wherein the mineralization degree of the water is greater than or equal to 5000mg/l.
Preferably, in the fourth step, the completion fluid is an aqueous solution of potassium chloride.
Preferably, in the third step, cementing is carried out, and the short casing with a soluble inner wall meets the impact pressure requirement of more than 30 MPa.
In the invention, the temperature of the stratum which can be resisted by the soluble material 2 is 60-120 degrees, as shown in figure 3 and figure 4, after the well is fixed for at most 10 days, the soluble material 2 is completely dissolved in aqueous solution or completion fluid, the wall thickness of the short casing with a soluble inner wall becomes weak, and under the condition of well head pressure, the weak part of the casing is broken, so that a liquid inlet channel is provided for subsequent sand fracturing.
Example 3:
based on example 1 or 2, the sux H1 well in this example is a horizontal well of a friger gas field, and 5 well sections are reformed by a bridge plug staged fracturing process. 2 short sleeves with 2 meters long and soluble inner walls are arranged at a first reconstruction section of a gas layer during well cementation, the inner walls of the short sleeves with the soluble inner walls are made of soluble materials 2, and the wall thickness of the soluble materials 2 accounts for 30% of that of the short sleeves with the soluble inner walls; wherein the soluble material consists of the following components in parts by weight: 40 parts of modified polyurethane-polyalkyl ester material, 18 parts of plasticizer, 10 parts of nano reinforcing material, 0.1 part of antioxidant and 0.5 part of lubricant.
After the well cementation is finished, injecting water solution into the well, dissolving soluble materials after 6 days, and building liquid injection discharge capacity to form a liquid inlet channel when wellhead pressure test is found. The first section of fracturing construction is started, the cable pumps the bridge plug and the perforation tool string → seals the bridge plug → perforation → ball injection → fracturing reconstruction of the second section → the bridge plug perforation combination and fracturing operation of all the reconstruction sections are completed in sequence → blowout and liquid discharge → production string under pressure → blowout and liquid discharge → test and production request.
Example 4:
based on example 1 or 2, the sux H2 well in this example is a horizontal well of a friger gas field, and 4 well sections are reformed by using a bridge plug staged fracturing process. 3 short sleeves with the length of 1 meter and soluble inner walls are arranged in a first reconstruction section of a gas layer during well cementation, the inner walls of the short sleeves with the soluble inner walls are made of soluble materials 2, and the wall thickness of the soluble materials 2 accounts for 50% of that of the short sleeves with the soluble inner walls; wherein the soluble material consists of the following components in parts by weight: 90 parts of modified polyurethane-polyalkyl ester material, 15 parts of plasticizer, 8 parts of nano reinforcing material, 0.3 part of antioxidant and 1 part of lubricant.
After the well cementation is finished, a KCL water solution with the mass concentration of 4-5% is injected into the well, the soluble material is dissolved after 4 days, and the pressure test at the wellhead finds that the injection discharge capacity of the liquid is established, so that a liquid inlet channel is formed. The first section of fracturing construction is started, the cable pumps the bridge plug and the perforation tool string → the bridge plug is sealed by a seat → perforation → ball injection → the second section of fracturing modification → the bridge plug perforation combination and fracturing operation of all the modified sections are completed in sequence → blowout and liquid discharge → production string under pressure → blowout and liquid discharge → test for production.
Example 5:
based on example 1 or 2, the scott star well in this example is a straight well in a suriger gas field, and 4 layers are reconstructed by using a bridge plug staged fracturing process. 3 short sleeves with soluble inner walls of 1 meter in length are arranged below a first reconstruction layer of a gas layer during well cementation, the inner walls of the short sleeves with soluble inner walls are made of soluble materials 2, and the wall thickness of the soluble materials 2 accounts for 40% of that of the short sleeves with soluble inner walls; wherein the soluble material 2 consists of the following components in parts by weight: 80 parts of modified polyurethane-polyalkyl ester material, 10 parts of plasticizer, 5 parts of nano reinforcing material, 0.2 part of antioxidant and 0.8 part of lubricant.
After the well cementation is finished, a KCL water solution with the mass concentration of 3-5% is injected into the well, the soluble material is dissolved after 4 days, and the pressure test at the wellhead finds that the liquid injection discharge capacity is established, so that a liquid inlet channel is formed. The first layer of fracturing construction is started, the cable pumps the bridge plug and the perforation tool string → the bridge plug is sealed by a seat → perforation → ball injection → the second layer of fracturing modification → the bridge plug perforation combination and fracturing operation of all the modified sections are completed in sequence → blowout and liquid discharge → production string under pressure → blowout and liquid discharge → test for production.
Example 6:
based on example 1 or 2, the scott × well in this example is one directional well of a perierg gas field, and 2 levels were reformed by a bridge plug staged fracturing process. 2 short sleeves with soluble inner walls of 1 meter in length are arranged below a first reconstruction layer of a gas layer during well cementation, the inner walls of the short sleeves with soluble inner walls are made of soluble materials 2, and the wall thickness of the soluble materials 2 accounts for 45% of that of the short sleeves with soluble inner walls; wherein the soluble material 2 consists of the following components in parts by weight: 50 parts of modified polyurethane-polyalkyl ester material, 15 parts of plasticizer, 10 parts of nano reinforcing material, 0.1 part of antioxidant and 0.5 part of lubricant.
After the well cementation is finished, a KCL water solution with the mass concentration of 3-5% is injected into the well, the soluble material is dissolved after 3 days, and the pressure test at the wellhead finds that the liquid injection discharge capacity is established, so that a liquid inlet channel is formed. The first layer of fracturing construction is started, the cable pump bridge plug and the perforation tool string → the bridge plug is sealed, the perforation → the ball is thrown, the second layer of fracturing modification → the blowout and liquid discharge → the production string is pressed under pressure → the blowout and liquid discharge → the test is carried out for production.
Examples 3, 4, 5, and 6 show that the inner wall dissolvable short sleeves of the present invention can be completely dissolved in water or completion fluids within up to 10 days, after dissolution, the position of the inner wall dissolvable short sleeve forms a complete channel. The compatibility of the soluble material and the stratum used by the invention does not cause new damage to the reservoir.
The inner diameter of the short sleeve with the soluble inner wall is consistent with that of the production sleeve, so that the requirement of large-displacement modification of a reservoir is met; the short sleeve with the soluble inner wall can realize the full drift diameter of the shaft after the dissolving measure, thereby facilitating the subsequent shaft operation; the invention has uncomplicated internal structure and easy operation, and is suitable for measure reconstruction of directional wells and horizontal wells, newly built wells and repeatedly reconstructed wells.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (6)
1. A fracture initiation method for a cased well is characterized in that: the method comprises the following specific steps:
manufacturing a short sleeve with a soluble inner wall, wherein the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve; the preparation method for manufacturing the short sleeve with the soluble inner wall comprises the following steps: firstly, selecting a short sleeve with the same inner diameter as that of a production sleeve, then processing the inner wall of a sleeve body (1) of the short sleeve to thin the wall thickness of the short sleeve, and then filling the wall thickness of the short sleeve with a soluble material (2) through a mould to form the short sleeve with a soluble inner wall, so that the inner diameter of the short sleeve with the soluble inner wall is the same as that of the production sleeve; the soluble material (2) consists of the following components in parts by weight: 40 parts of modified polyurethane-polyalkyl ester material, 5-18 parts of plasticizer, 5-10 parts of nano reinforcing material, 0.1-0.3 part of antioxidant and 0.5-1 part of lubricant; the thickness of the soluble material (2) occupies 30-50% of the wall thickness of the short sleeve with the soluble inner wall; the soluble material (2) can resist the formation temperature of 60-120 degrees;
secondly, a short sleeve with a soluble inner wall is put into a well section of a gas layer to be modified;
step three, cementing the well, wherein the short sleeve with the soluble inner wall meets the collision pressure requirement of more than 30 MPa;
step four, the inner wall of the short sleeve with the soluble inner wall is dissolved in 10 days at most under the action of water or completion fluid, wherein the mineralization degree of the water is more than or equal to 5000mg/l;
and fifthly, pressing the well mouth, breaking the short sleeve with the soluble inner wall at the weak wall thickness, and if the discharge capacity can be established, judging that the liquid can be absorbed by the stratum and enter the reservoir stratum to form a fracturing channel.
2. A method of initiating a fracture in a cased well according to claim 1, wherein: in the first step, the short sleeve with the soluble inner wall is 1-3m long and the wall thickness is 5-9cm.
3. A method of initiating a fracture in a cased well according to claim 1, wherein: the soluble material (2) is sleeved in the sleeve body (1) in a cylindrical shape.
4. A method of initiating a fracture in a cased well according to claim 1, wherein: the modified polyurethane-polyalkyl ester material is prepared by copolymerizing and polymerizing polyglycolide, polyethylene glycol and polylactide through a triblock chain extender.
5. A method of initiating a fracture in a cased well according to claim 1, wherein: in the fourth step, the completion fluid is a potassium chloride aqueous solution.
6. A method of initiating a fracture in a cased well according to claim 1, wherein: the thickness of the soluble material (2) occupies 40% of the wall thickness of the short sleeve in which the inner wall is soluble.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4673039A (en) * | 1986-01-24 | 1987-06-16 | Mohaupt Henry H | Well completion technique |
| US4890675A (en) * | 1989-03-08 | 1990-01-02 | Dew Edward G | Horizontal drilling through casing window |
| US9428988B2 (en) * | 2011-06-17 | 2016-08-30 | Magnum Oil Tools International, Ltd. | Hydrocarbon well and technique for perforating casing toe |
| US8967276B2 (en) * | 2012-01-18 | 2015-03-03 | Baker Hughes Incorporated | Non-ballistic tubular perforating system and method |
| CN107629772A (en) * | 2017-08-24 | 2018-01-26 | 中国石油天然气股份有限公司 | A kind of water-soluble diversion agent of 90~120 DEG C of dissolvings and preparation method thereof |
| CN110439522B (en) * | 2019-08-16 | 2022-03-18 | 中国石油化工集团有限公司 | Controllable corrosion opening device for first-section fracturing channel and fracturing sectional operation construction process |
| CN111088973B (en) * | 2020-01-10 | 2023-07-07 | 新疆恒智伟业石油工程技术开发有限公司 | Multifunctional fracturing completion pipe string and process for high-temperature high-pressure oil-gas well |
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