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Compound temporary plugging agent and compound temporary plugging method used in temporary blocking turnaround fracture

A temporary plugging agent and fracturing technology, applied in chemical instruments and methods, drilling compositions, earthwork drilling and production, etc., can solve the problem of bridging, enrichment, sealing and plugging, single temporary plugging agent or Temporary plugging agent mixture, difficult to form tight plugging layer and other problems, to achieve the effect of improving the use efficiency and refracturing success rate, efficient temporary plugging performance, and reducing the amount of use

Active Publication Date: 2017-01-25
北京斯迪莱铂油气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the above-mentioned existing technologies use a single temporary blocking agent or a mixture of temporary blocking agents to perform temporary blocking diversion
However, it has been found through experiments that when there is only one particle temporary plugging agent or fiber temporary plugging agent, it is difficult to play the role of bridging enrichment and forming a tight sealing layer at the same time
If only non-expandable particle temporary plugging agent is used, it is difficult to form a tight plugging layer; if only expandable particles are used, it is difficult to bridging and enriching because of its softness

Method used

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  • Compound temporary plugging agent and compound temporary plugging method used in temporary blocking turnaround fracture
  • Compound temporary plugging agent and compound temporary plugging method used in temporary blocking turnaround fracture
  • Compound temporary plugging agent and compound temporary plugging method used in temporary blocking turnaround fracture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Use soluble acrylic resin (Nanjing Shousu Special Engineering Plastic Products Co., Ltd.) as temporary plugging agent a, pulverize it, and sieve out 5-10 mesh particles; use partially hydrolyzed polyacrylamide (Beijing Xitao Technology Development Co., Ltd.) as Temporary plugging agent b is crushed to screen out 10-20 mesh particles, and the temporary plugging agent a and b constitute composite temporary plugging agent 1.

[0043] Put temporary blocking agent a and temporary blocking agent b into water respectively, temporary blocking agent a hardly expands within 2 hours, while temporary blocking agent b expands about 3.2 times.

[0044] Mix temporary blocking agent a and temporary blocking agent b at a weight ratio of 5:1 and put them into water containing 2wt% HCl at 40°C. After 2 hours, the dissolution rate reaches 96%. The water-insoluble content of the mixture of temporary blocking agent a and temporary blocking agent b with a weight ratio of 5:1 was determined to...

Embodiment 2

[0058] Use polyvinyl alcohol particles (Shanghai Kaidu International Trade Co., Ltd.) as temporary plugging agent a, pulverize it, and sieve out 5-10 mesh particles; use carboxymethyl cellulose and acrylamide copolymer (Shandong Dongda Polymer Material Co., Ltd.) is the temporary plugging agent b, which is pulverized and sieved to obtain 10-20 mesh particles; the temporary plugging agent a and b constitute the composite temporary plugging agent 2.

[0059] Put temporary blocking agent a and temporary blocking agent b into water, within 2 hours temporary blocking agent a expands very little, while temporary blocking agent b expands about 5 times.

[0060] Mix temporary blocking agent a and temporary blocking agent b at a weight ratio of 6:1 and put them into 80°C water containing 2wt% ammonium persulfate, and the dissolution rate reaches more than 95%. The water-insoluble content of the mixture of temporary blocking agent a and temporary blocking agent b with a weight ratio of ...

Embodiment 3

[0063] Use sulfonated asphalt (Shandong Yanggu Longquan Chemical Factory) as temporary plugging agent a, pulverize it, and sieve out 4-10 mesh particles; use carboxymethyl cellulose (Changzhou Guoyu Environmental Protection Technology Co., Ltd.) as temporary plugging agent a. Blocking agent b is pulverized and sieved to obtain 10-20 mesh particles; the temporary blocking agent a and b constitute composite temporary blocking agent 3.

[0064] Put temporary blocking agent a and temporary blocking agent b into water, temporary blocking agent a hardly expands within 2 hours, while temporary blocking agent b expands about 4 times.

[0065] Mix temporary blocking agent a and temporary blocking agent b at a weight ratio of 8:1 and put them into water containing 3% HCl at 60°C, and the dissolution rate reaches over 96%. The water-insoluble content of the mixture of temporary blocking agent a and temporary blocking agent b with a weight ratio of 8:1 was determined to be 5.2 wt%.

[00...

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Abstract

The invention provides a compound temporary plugging agent used in temporary blocking turnaround fracture. The compound temporary plugging agent comprises a temporary plugging agent a and a temporary plugging agent b, wherein the temporary plugging agent a is selected from a rigid temporary plugging agent, the temporary plugging agent b is selected from an expansion temporary plugging agent. The invention further provides a compound temporary plugging method used in turnaround fracture in an oil field, and the compound temporary plugging method comprises the step that the temporary plugging agent a and the temporary plugging agent b are injected into fractures of an oil well in sequence. According to the compound temporary plugging agent provided by the invention, the rigid temporary plugging agent and the expansion temporary plugging agent are selected and skillfully used in a matched manner, so that the using efficiency and the refracturing success rate of the temporary plugging agent are improved greatly.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and natural gas, in particular to a composite temporary plugging agent used in temporary plugging diversion fracturing, and a composite temporary plugging method. Background technique [0002] At present, the temporary plugging agents used in oil field fracturing mainly include water-soluble granular temporary plugging agents and fiber-type temporary plugging agents. Water-soluble granular temporary plugging agents are divided into expandable and non-expandable types. Except for some reports that granular temporary plugging agent and fiber type temporary plugging agent are used in combination, temporary plugging agent is mostly used alone. [0003] Chinese patent application CN103835691 proposes a multi-crack generation method. After the cracks are opened, a high-strength water-soluble granular temporary plugging agent is added to seal the cracks until the preset number of cra...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/13
CPCC09K8/508E21B33/13
Inventor 程兴生薛世杰张智勇谭建勇王永贤
Owner 北京斯迪莱铂油气技术有限公司
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