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Acid-soluble plugging agent, acid-soluble plugging fluid and preparation method therefor

A plugging agent and acid-soluble technology, which is applied in sealing/seal, chemical instruments and methods, earthwork drilling and mining, etc., can solve the problems of low compressive strength and low acid-soluble rate of plugging agents, and achieve strong anti-seepage ability, enhance the effect of the overall compressive strength

Pending Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide an acid-soluble plugging agent to solve the problems of low compressive strength and low acid-soluble rate of the plugging agent in the prior art

Method used

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  • Acid-soluble plugging agent, acid-soluble plugging fluid and preparation method therefor
  • Acid-soluble plugging agent, acid-soluble plugging fluid and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The acid-soluble sealing agent of the present embodiment comprises the following components by weight percentage: 25% cement, 25% shell silt, 15% calcium carbonate, 12% gypsum, 5% polyamide fiber (nylon 6) , 7.7% bentonite, 10% xerogel particles, 0.3% retarder sulfomethyl tannin; wherein the particle size of cement is 300 mesh, the particle size of shell silt is 300 mesh, and the particle size of xerogel particles The particle size is 50 mesh; the above-mentioned xerogel particles are pre-crosslinked gel particle powder, and the pre-crosslinked gel particle powder is obtained by drying the pre-crosslinked gel particles at 75°C for 48 hours and grinding to a particle size of 50 mesh to get. The expansion rate of the pre-crosslinked gel particle powder is less than 50% in 2 hours. The pre-crosslinked gel particles are prepared by polymerizing acrylamide, sodium acrylate and N-N methylenebisacrylamide.

[0029] The acid-soluble plugging fluid in this embodiment includes ...

Embodiment 2

[0033] The acid-soluble sealing agent of the present embodiment comprises the following components by weight: 30% cement, 20% shell silt, 19% calcium carbonate, 10% gypsum, 5% polyamide fiber (nylon 6) , 5.4% bentonite, 10% xerogel particles, 0.6% retarder sulfomethyl tannin; wherein the particle size of cement is 500 mesh, the particle size of shell silt is 300 mesh, and the particle size of xerogel particles The particle size is 50 mesh; the above-mentioned xerogel particles are pre-crosslinked gel particle powder, and the pre-crosslinked gel particle powder is obtained by drying the pre-crosslinked gel particles at 75°C for 48 hours and grinding to a particle size of 50 mesh to get. The expansion rate of the pre-crosslinked gel particle powder is less than 50% in 2 hours. The pre-crosslinked gel particles are prepared by polymerizing acrylamide, sodium acrylate and N-N methylenebisacrylamide.

[0034] The acid-soluble plugging fluid in this embodiment includes a plugging ...

Embodiment 3

[0038] The acid-soluble sealing agent of the present embodiment comprises the following components by weight: 20% cement, 30% shell silt, 20% calcium carbonate, 10% gypsum, 5% polyamide fiber (nylon 6) , 10% bentonite, 4.7% xerogel particles, 0.3% retarder sulfomethyl tannin; wherein the particle size of cement is 400 mesh, the particle size of shell silt is 300 mesh, and the particle size of xerogel particles The particle size is 50 mesh; the above-mentioned xerogel particles are pre-crosslinked gel particle powder, and the pre-crosslinked gel particle powder is obtained by drying the pre-crosslinked gel particles at 75°C for 48 hours and grinding to a particle size of 50 mesh to get. The expansion rate of the pre-crosslinked gel particle powder is less than 50% in 2 hours. The pre-crosslinked gel particles are prepared by polymerizing acrylamide, sodium acrylate and N-N methylenebisacrylamide.

[0039] The acid-soluble plugging fluid in this embodiment includes a plugging ...

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Abstract

The invention relates to an acid-soluble plugging agent, acid-soluble plugging fluid and a preparation method therefor and belongs to the technical field of oilfield chemistry. The acid-soluble plugging agent disclosed by the invention is prepared from the following ingredients in parts by weight: 20-30 parts of cement, 20-40 parts of shell silt, 14-25 parts of calcium carbonate, 10-15 parts of gypsum, 3-6 parts of polyamide fibers, 5-10 parts of bentonite, 0.3-0.6 part of setting retarder and 3-10 parts of xerogel particles. According to the acid-soluble plugging agent and the acid-soluble plugging fluid, disclosed by the invention, a variety of ingredients are compounded, the defects in the prior art that the pressure resisting level is relatively low, the plugging radius is small, the effective period of plugging is short, and the like are overcome, the pressure resistance reaches 25MPa or more, the plugging radius reaches 2.0 meters or more, and the acid-soluble rate reaches 70% ormore during unplugging.

Description

technical field [0001] The invention relates to an acid-soluble plugging agent, an acid-soluble plugging fluid and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] Many oilfields in China have entered the stage of high water cut development. With the implementation of "water injection into layers, fine injection and production", the division of layer series is becoming more and more finer, and the contradiction between layers is getting bigger and bigger. For some wells with poor conditions, mechanical injection cannot be implemented. The sealed reservoirs are generally sealed with inorganic chemicals. However, in the subsequent adjustment of the well pattern, when the plugging layer needs to be reused, chemical plugging removal is difficult to achieve, and secondary hole repair is usually used to remove plugging, and the success rate is low. Therefore, the use of acid-soluble inorganic plugging agent is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467E21B33/13C04B28/14
CPCC04B28/14C04B2201/50C09K8/467C09K2208/08E21B33/13C04B7/00C04B14/28C04B16/0691C04B14/104C04B2103/22C04B24/2688
Inventor 赵泽宗于鑫齐德山张凯陈山朱锰飞尚素芹李冰
Owner CHINA PETROLEUM & CHEM CORP
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