CN109236228B - Gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing - Google Patents
Gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing Download PDFInfo
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- CN109236228B CN109236228B CN201810945587.1A CN201810945587A CN109236228B CN 109236228 B CN109236228 B CN 109236228B CN 201810945587 A CN201810945587 A CN 201810945587A CN 109236228 B CN109236228 B CN 109236228B
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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
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
Abstract
The invention provides a gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing, which comprises the following specific steps of: 1) is thrown at the well head and sent toA ball seat position; 2) using 0.6-1.2m3The displacement per min, the injection of the spacer fluid is 50 meters of the volume of the well bore; 3) by 0.6m3Discharging volume per minute, and injecting temporary plugging gel; 4) perforating, namely increasing the discharge capacity to the required requirement according to the fracturing construction design, and constructing; 5) and before the construction is finished, injecting a displacing liquid added with a gel breaker, wherein the gel breaker accounts for 0.35-0.45 percent of the total weight of the gel breaker and the displacing liquid by mass percent, preventing blowout after the construction is finished, and putting a sand washing pipe column until no sand exists in a well mouth for the next section of construction. The invention reduces the risk that the cable transmission bridge plug passes through the perforation section; the number of the modification sections of the horizontal reservoir is increased, and an oil layer section cannot be easily abandoned due to construction; the temporary plugging success rate is high, the gel breaking is easy, and troubles cannot be caused to later drilling and plugging; the raw materials are easy to obtain, and the preparation process is simple.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing.
Background
The dense oil and gas resources in China are rich and mainly distributed in basins such as Ordos, Sichuan, Songliao, Bohai Bay and Quascurel, and exploration and evaluation show that the total resource quantity of the dense oil only reaches 110-135 hundred million tons. In recent years, the hydraulic pumping speed drilling bridge plug volume fracturing technology is widely applied to the development of the shale gas and the compact oil in North America, and is a foreign compact reservoir horizontal well main body transformation process. The process has the characteristics of high operating efficiency, capability of realizing volume fracturing large-discharge injection, multi-cluster perforation and the like, and is widely applied to foreign shale gas reservoir and compact gas reservoir development as a novel horizontal well modification technology in recent years. Through field tests, compared with the conventional process, the number of construction sections of a single well is reduced by 30%, and the construction period is shortened by more than 50%; meanwhile, the localization of the key technology is realized, compared with the technology introduction, the cost is reduced by more than 50%, and the cost is greatly reduced; the average initial yield of the production well is more than 10t/d, the transformation effect is good, and the application prospect is good.
However, the popularization and application of the technology face one maximum technical difficulty: because the bridge plug quality is not good or the shaft is irregular, the bridge plug seat seal is not good, the ball is not pressed, and according to the technical requirement that the logging bridge plug can not pass through the perforation section, the oil layer of the section has to be abandoned, thereby causing the yield loss of the oil well.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the pressure-resistant temperature-resistant shielding temporary plugging gel suitable for the staged multi-cluster fracturing process of the bridge plug drilled at the speed of the horizontal well, and the gel shields temporary plugging of the modified reservoir with poor ball throwing pressure test of the bridge plug, so that the normal modification construction of the reservoir is ensured.
The invention provides a gel temporary plugging method suitable for bridge plug subsection multi-cluster fracturing, and aims to increase the success rate of a bridge plug reconstruction process and reduce the risk of a cable transmission bridge plug passing through a perforation section by the gel temporary plugging process suitable for the bridge plug subsection multi-cluster fracturing process.
The second purpose of the invention is that the gel temporary plugging process suitable for the bridge plug subsection multi-cluster fracturing process increases the number of the modification sections of the horizontal reservoir and can not easily abandon the oil layer section due to construction.
The invention also aims to provide a gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process, which has high temporary plugging success rate and easy gel breaking and can not cause troubles for later drilling and plugging.
The invention also aims to provide the raw materials used in the invention, which are easy to obtain and the preparation process is simple.
The technical scheme adopted by the invention is as follows:
a gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing comprises the following specific steps:
1) throwing balls at a wellhead and sending the balls to a ball seat position;
2) using 0.6-1.2m3The displacement per min, the injection of the spacer fluid is 50 meters of the volume of the well bore;
3) injecting temporary plugging gel;
4) perforating, namely increasing the discharge capacity to the required requirement according to the fracturing construction design, and constructing;
5) and before the construction is finished, injecting a displacing liquid added with a gel breaker, wherein the gel breaker accounts for 0.35-0.45 percent of the total mass of the gel breaker and the displacing liquid, preventing blowout after the construction is finished, and putting a sand washing pipe column until no sand exists in a well mouth for the next section of construction.
The isolating liquid in the step 2) consists of 00.2-0.4% of guar gum base liquid, 0.3-0.6% of fiber and the balance of water by mass ratio.
In the step 3), the preparation method of the temporary plugging gel comprises the following steps: 100 parts of water; 12-18 parts of a gelling agent; 10-20 parts of fibers; 3-5 parts of bentonite; 7-10 parts of 40/70-mesh quartz sand; 12-20 parts of 20/40-mesh quartz sand; 3-5 parts of pH regulator, and the components are added in sequence 1 hour before construction, and are continuously stirred for construction.
The synthesis method of the gelling agent comprises the following steps: mixing heteropolysaccharide and guar gum according to the proportion of 1: (1.1-1.8), and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20% -30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 15-17h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
The bentonite is sodium bentonite.
The pH regulator is one of citric acid and acetic acid.
The gel breaker in the step 5) is a mixture of sodium carbonate, sodium persulfate and potassium persulfate, wherein the mass ratio of the sodium carbonate to the sodium persulfate to the potassium persulfate is 1: (2.5-5.5): (11.5-15.5).
0.6m is used in step 3)3And (4) injecting temporary plugging gel at the displacement of/min, wherein the injection amount is the volume of a well bore from the position of the bridge plug of the last reconstruction layer or from the bottom of the well to the position of the original bridge plug of the layer.
The invention has the beneficial effects that:
1. the gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process increases the success rate of the bridge plug transformation process and reduces the risk of a cable transmitting the bridge plug to pass through the perforation segment.
2. The gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process increases the number of the modification sections of the horizontal reservoir, and an oil layer section cannot be easily abandoned due to construction.
3. The gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process has high temporary plugging success rate and easy gel breaking, and does not cause troubles for later drilling and plugging.
4. The raw materials used in the invention are easy to obtain, and the preparation process is simple.
Detailed Description
Example 1:
aiming at the problems in the prior art, the invention aims to provide the pressure-resistant temperature-resistant shielding temporary plugging gel suitable for the staged multi-cluster fracturing process of the bridge plug drilled at the speed of the horizontal well, and the gel shields temporary plugging of the modified reservoir with poor ball throwing pressure test of the bridge plug, so that the normal modification construction of the reservoir is ensured.
The invention provides a gel temporary plugging method suitable for bridge plug subsection multi-cluster fracturing, and aims to increase the success rate of a bridge plug reconstruction process and reduce the risk of a cable transmission bridge plug passing through a perforation section by the gel temporary plugging process suitable for the bridge plug subsection multi-cluster fracturing process.
The second purpose of the invention is that the gel temporary plugging process suitable for the bridge plug subsection multi-cluster fracturing process increases the number of the modification sections of the horizontal reservoir and can not easily abandon the oil layer section due to construction.
The invention also aims to provide a gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process, which has high temporary plugging success rate and easy gel breaking and can not cause troubles for later drilling and plugging.
The invention also aims to provide the raw materials used in the invention, which are easy to obtain and the preparation process is simple.
A gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing comprises the following specific steps:
1) throwing balls at a wellhead and sending the balls to a ball seat position;
2) using 0.6-1.2m3The displacement per min, the injection of the spacer fluid is 50 meters of the volume of the well bore;
3) injecting temporary plugging gel;
4) perforating, namely increasing the discharge capacity to the required requirement according to the fracturing construction design, and constructing;
5) and before the construction is finished, injecting a displacing liquid added with a gel breaker, wherein the gel breaker accounts for 0.35-0.45 percent of the total mass of the gel breaker and the displacing liquid, preventing blowout after the construction is finished, and putting a sand washing pipe column until no sand exists in a well mouth for the next section of construction.
The method is suitable for the conditions that when a horizontal well is transformed by adopting a rapid drilling bridge plug subsection multi-cluster fracturing process, the bridge plug cannot be seated, the pressure test cannot be carried out after ball throwing, the transformation of the section cannot be given up, and meanwhile, the stratum fracture pressure is less than 40 MPa.
The gel shielding temporary plugging process suitable for the staged multi-cluster fracturing process of the bridge plug for the fast drilling of the horizontal well increases the success rate of the bridge plug transformation process, and reduces the risk of a cable transmitting the bridge plug to pass through a perforation section; the number of the modification sections of the horizontal reservoir is increased, and an oil layer section cannot be easily abandoned due to construction; the temporary plugging success rate is high, the gel breaking is easy, and troubles cannot be caused to later drilling and plugging; the raw materials are easy to obtain, and the preparation process is simple.
Example 2:
based on the above embodiment, the spacer fluid in step 2) described in this embodiment is composed of 00.2% -0.4% of guar gum base fluid, 0.3% -0.6% of fiber and the balance of water by mass ratio.
In the step 3), the preparation method of the temporary plugging gel comprises the following steps: 100 parts of water; 12-18 parts of a gelling agent; 10-20 parts of fibers; 3-5 parts of bentonite; 7-10 parts of 40/70-mesh quartz sand; 12-20 parts of 20/40-mesh quartz sand; 3-5 parts of pH regulator, and the components are added in sequence 1 hour before construction, and are continuously stirred for construction.
The synthesis method of the gelling agent comprises the following steps: mixing heteropolysaccharide and guar gum according to the proportion of 1: (1.1-1.8), and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20% -30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 15-17h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
The bentonite is sodium bentonite.
The pH regulator is one of citric acid and acetic acid.
The gel breaker in the step 5) is a mixture of sodium carbonate, sodium persulfate and potassium persulfate, wherein the mass ratio of the sodium carbonate to the sodium persulfate to the potassium persulfate is 1: (2.5-5.5): (11.5-15.5).
0.6m is used in step 3)3And (4) injecting temporary plugging gel at the displacement of/min, wherein the injection amount is the volume of a well bore from the position of the bridge plug of the last reconstruction layer or from the bottom of the well to the position of the original bridge plug of the layer.
When a horizontal well is transformed by adopting a rapid drilling bridge plug subsection multi-cluster fracturing process, the gel temporary plugging process provided by the invention is adopted when the conditions that the bridge plug cannot be seated and the pressure test cannot be carried out after ball injection occur.
1. And (4) throwing balls at a wellhead and sending the balls to a ball seat position. If the non-soluble balls or soluble balls adopted in the first construction stage are not dissolved, the non-soluble balls or soluble balls are not needed.
2. Using 0.6-1.2m3The displacement per min, the injection spacer fluid, which is composed of 0.3% of guanidine gum base fluid and 0.5% of fiber, and the balance of water, the injection amount is 50 meters of the well bore volume.
3. By 0.6m3And (4) injecting temporary plugging gel into the well with the displacement of/min, wherein the injection amount is the volume of the well from the position of the bridge plug of the last reconstruction layer (or the bottom of the well) to the position of the original bridge plug of the layer.
4. And (5) perforating, carrying out displacement increasing construction, and adjusting a temporary plugging gel formula to carry out temporary plugging again if the temporary plugging is unsuccessful.
5. Before the construction is finished, adding a gel breaker into the displacement fluid, wherein the addition amount is 0.04 percent (mass fraction), the displacement fluid is used for completely squeezing the sand in the shaft into the stratum, and after the construction is finished, open-blowing and putting into a sand washing pipe column until no sand exists in the well mouth for the next section of construction.
According to the invention, the better bridging and plugging effects are provided by adopting two kinds of quartz sand with different particle sizes and bentonite, the bentonite is conventional sodium bentonite, and the fiber is YQ-1 type fiber produced by a Chinese petrochemical Sichuan vinylon factory; the heteropolysaccharide is SJ type heteropolysaccharide of Jiangsu Yangzhou oilfield chemical agent factory, and the reagents explained in detail in the invention are conventional reagents, and can be directly purchased in the market, and the invention is not explained one by one.
Example 3:
based on the above embodiments, in this embodiment, when a certain flat-a well is long and is reconstructed by a rapid drilling bridge plug staged multi-cluster fracturing process, the bridge plug in the third section cannot be seated, pressure testing cannot be performed after ball dropping, the reconstruction in the third section cannot be abandoned, and meanwhile, the formation fracture pressure is 35 MPa. And adopting gel shielding for temporary blocking.
Synthesizing a gelling agent: mixing heteropolysaccharide and guar gum according to the proportion of 1: 1.5, and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20-30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 16h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
Preparing temporary plugging gel:
100 parts of water; 18 parts of a gelling agent; 20 parts of fiber; 5 parts of bentonite; 10 parts of 40/70-mesh quartz sand; 20 parts of 20/40-mesh quartz sand; 5 parts of citric acid, and the components are sequentially added 1 hour before construction, and are continuously stirred for construction.
The construction process comprises the following steps:
1) throwing ball at well head and sending to ball seat position
2) By 0.6m3Row of/minMeasuring, injecting spacer fluid, wherein the spacer fluid consists of 0.3% of guanidine gum base fluid, 0.5% of fiber group and water, and the injection amount is 6m3。
3) By 0.6m3The discharge amount per minute is 8m, and temporary plugging gel is injected3。
4) And perforating, increasing the discharge capacity, successfully performing temporary plugging and smoothly constructing.
5) Before the construction is finished, adding sodium carbonate, sodium persulfate and potassium persulfate into the displacement fluid according to the mass ratio of 1: 4.5: 13.5.
and after the construction is finished, blowout prevention is carried out, and a sand washing pipe column is put in until no sand exists in the wellhead for the next section of construction.
Example 4:
based on the embodiments 1 and 2, in this embodiment, when a certain flat-B well is long and is reconstructed by a rapid drilling bridge plug staged multi-cluster fracturing process, the bridge plug cannot be seated in the eighth stage, pressure testing cannot be performed after ball throwing, the reconstruction in this stage cannot be abandoned, and meanwhile, the formation fracture pressure level is 37.6 MPa. And adopting gel shielding for temporary blocking.
Synthesizing a gelling agent: mixing heteropolysaccharide and guar gum according to the proportion of 1: 1.8, and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20-30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 16h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
Preparing temporary plugging gel:
100 parts of water; 15 parts of a gelling agent; 15 parts of fiber; 4 parts of bentonite; 8 parts of 40/70-mesh quartz sand; 15 parts of 20/40-mesh quartz sand; 4 parts of citric acid; the components are added in sequence 1 hour before construction, and the mixture is continuously stirred for construction.
The construction process comprises the following steps:
1) throwing ball at well head and sending to ball seat position
2) By 0.6m3The discharge amount per min, and the isolation liquid is injected, wherein the isolation liquid consists of 0.3 percent of guanidine gum base liquid, 0.5 percent of fiber group and water, and the injection amount is 5m3。
3) By 0.6m3The discharge amount per min is 7 m, and temporary plugging gel is injected3。
4) And perforating, increasing the discharge capacity, successfully performing temporary plugging and smoothly constructing.
5) Before the construction is finished, adding sodium carbonate, sodium persulfate and potassium persulfate into the displacement fluid according to the mass ratio of 1: 2.5: 11.5.
and after the construction is finished, blowout prevention is carried out, and a sand washing pipe column is put in until no sand exists in the wellhead for the next section of construction.
Example 5:
based on the embodiments 1 and 2, in this embodiment, when a certain flat-C well is long and is reconstructed by a rapid drilling bridge plug staged multi-cluster fracturing process, the bridge plug at the fifth stage cannot be seated, pressure testing cannot be performed after ball throwing, the reconstruction at this stage cannot be abandoned, and meanwhile, the formation fracture pressure is 36.9 MPa. And adopting gel shielding for temporary blocking.
Synthesizing a gelling agent: mixing heteropolysaccharide and guar gum according to the proportion of 1: 1.3, and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20-30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 16h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
Preparing temporary plugging gel:
100 parts of water; 12 parts of a gelling agent; 13 parts of fiber; 3 portions of bentonite
9 parts of 40/70-mesh quartz sand; 19 parts of 20/40-mesh quartz sand; acetic acid 3 parts
The components are added in sequence 1 hour before construction, and the mixture is continuously stirred for construction.
The construction process comprises the following steps:
1) throwing ball at well head and sending to ball seat position
2) By 0.8m3The discharge amount per min, and the isolation liquid is injected, wherein the isolation liquid consists of 0.3 percent of guanidine gum base liquid, 0.5 percent of fiber group and water, and the injection amount is 8m3。
3) By 0.6m3The discharge amount per minute is 8m, and temporary plugging gel is injected3。
4) And perforating, increasing the discharge capacity, successfully performing temporary plugging and smoothly constructing.
5) Before the construction is finished, adding sodium carbonate, sodium persulfate and potassium persulfate into the displacement fluid according to the mass ratio of 1: 5.5: 15.5.
and after the construction is finished, blowout prevention is carried out, and a sand washing pipe column is put in until no sand exists in the wellhead for the next section of construction.
The gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process increases the success rate of the bridge plug transformation process and reduces the risk of a cable transmitting the bridge plug to pass through the perforation segment. The gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process increases the number of the modification sections of the horizontal reservoir, and an oil layer section cannot be easily abandoned due to construction. The gel temporary plugging process suitable for the bridge plug segmented multi-cluster fracturing process has high temporary plugging success rate and easy gel breaking, and does not cause troubles for later drilling and plugging. The raw materials used in the invention are easy to obtain, and the preparation process is simple.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. The data and steps not described in detail in this embodiment are well known and commonly used in the industry, and are not described here.
Claims (8)
1. A gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing is characterized by comprising the following steps: the method comprises the following specific steps:
1) throwing balls at a wellhead and sending the balls to a ball seat position;
2) using 0.6-1.2m3The displacement per min, the injection of the spacer fluid is 50 meters of the volume of the well bore;
3) injecting temporary plugging gel;
4) perforating, namely increasing the discharge capacity to the required requirement according to the fracturing construction design, and constructing;
5) and before the construction is finished, injecting a displacing liquid added with a gel breaker, wherein the gel breaker accounts for 0.35-0.45 percent of the total mass of the gel breaker and the displacing liquid, preventing blowout after the construction is finished, and putting a sand washing pipe column until no sand exists in a well mouth for the next section of construction.
2. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 1, wherein: the isolating liquid in the step 2) consists of 0.2 to 0.4 mass percent of guanidine gum base liquid, 0.3 to 0.6 mass percent of fiber and the balance of water.
3. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 1, wherein: in the step 3), the preparation method of the temporary plugging gel comprises the following steps: 100 parts of water; 12-18 parts of a gelling agent; 10-20 parts of fibers; 3-5 parts of bentonite; 7-10 parts of 40/70-mesh quartz sand; 12-20 parts of 20/40-mesh quartz sand; 3-5 parts of pH regulator, and the components are added in sequence 1 hour before construction, and are continuously stirred for construction.
4. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 3, wherein: the synthesis method of the gelling agent comprises the following steps: mixing heteropolysaccharide and guar gum according to the proportion of 1: (1.1-1.8), and then adding the mixture into a polyethylene glycol solvent according to the mass concentration of 20% -30%; heating and stirring, and after the temperature reaches 65-75 ℃, sequentially dropwise adding glycol dimethyl ether, acetone, carbon tetrachloride and dodecyl trimethyl ammonium chloride solutions which account for 1-3%, 0.5-0.8% and 5-6% of the total mass of the solution; and carrying out reflux reaction for 15-17h, taking out a sample, and then cooling, carrying out suction filtration and drying to obtain a light brown powder sample.
5. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 3, wherein: the bentonite is sodium bentonite.
6. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 3, wherein: the pH regulator is one of citric acid and acetic acid.
7. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 1, wherein: the gel breaker in the step 5) is a mixture of sodium carbonate, sodium persulfate and potassium persulfate, wherein the mass ratio of the sodium carbonate to the sodium persulfate to the potassium persulfate is 1: (2.5-5.5): (11.5-15.5).
8. The gel temporary plugging method suitable for bridge plug staged multi-cluster fracturing as claimed in claim 1, wherein: the used amount of the catalyst in the step 3) is 0.6m3And (4) injecting temporary plugging gel at the displacement of/min, wherein the injection amount is the volume of a well bore from the position of the bridge plug of the last reconstruction layer or from the bottom of the well to the position of the original bridge plug of the layer.
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| CN112940699A (en) * | 2021-02-18 | 2021-06-11 | 维欧(天津)能源技术服务股份有限公司 | Preparation method of composite temporary plugging agent for temporary plugging diversion fracturing |
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| CN104531109B (en) * | 2014-12-23 | 2017-03-22 | 成都得道实业有限公司 | Organic synthetic plugging granules for well drilling, and preparation method and application thereof |
| CN104975838B (en) * | 2015-07-17 | 2017-11-14 | 中国石油大学(华东) | A kind of method for preventing high enegry gas fracturing existing crack from closing |
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