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High-strength resin plugging agent as well as preparation method and application of high-strength resin plugging agent

A high-strength, resin-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult post-processing, complicated on-site construction, poor pumpability, etc., achieve convenient post-processing, meet on-site construction, improve the effect of strength

Active Publication Date: 2018-10-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this enhanced gel plugging agent has good temperature resistance and long-term stability, it has high viscosity, poor pumpability, complicated on-site construction, and difficult post-processing.

Method used

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  • High-strength resin plugging agent as well as preparation method and application of high-strength resin plugging agent
  • High-strength resin plugging agent as well as preparation method and application of high-strength resin plugging agent
  • High-strength resin plugging agent as well as preparation method and application of high-strength resin plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 100g of unsaturated resin, 1g of methyl ethyl ketone peroxide, 1g of polymerization inhibitor (TEMP:TPC=2:1), 1g of vinylpyrrolidone into the beaker, stir well, make it fully mixed, then add 5g of microsilica powder, stir well , to obtain the unsaturated resin plugging agent of the present invention into a gel solution. Place it in a sample bottle, seal it, and place it in a constant temperature water bath at 60°C to observe that the gelation time is 8 hours, the volume shrinkage rate is less than 1%, and it has good adhesion.

[0053] Inspection of blocking ability:

[0054] The plugging ability of the resin provided in this example was examined. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm are filled with quartz sand to obtain high and low permeability simulated cores, which are recorded as 1# and 2#, and the original permeability is obtained after water flooding until the pressure is...

Embodiment 2

[0058] Add 100g of unsaturated resin, 0.5g of methyl ethyl ketone peroxide, 1g of polymerization inhibitor (TEMP:TPC=2:1), 1g of vinylpyrrolidone into the beaker, stir well, make it fully mixed, then add 5g of microsilica powder, stir Evenly, the unsaturated resin plugging agent of the present invention can be obtained. Place it in a sample bottle, seal it, and place it in a constant temperature water bath at 60°C to observe that the gelation time is 12 hours, the volume shrinkage rate is less than 1%, and it has good adhesion.

[0059] Inspection of blocking ability:

[0060] The plugging ability of the resin provided in this example was examined. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm are filled with quartz sand to obtain high and low permeability simulated cores, which are denoted as 3# and 4#, and the original permeability is obtained after water flooding until the pressure is stable ...

Embodiment 3

[0064] Add 100g of unsaturated resin, 0.5g of methyl ethyl ketone peroxide, 2g of polymerization inhibitor (TEMP:TPC=2:1), 1g of vinylpyrrolidone into the beaker, stir well, make it fully mixed, then add 5g of microsilica powder, stir Evenly, the unsaturated resin plugging agent of the present invention can be obtained. Place it in a sample bottle, seal it, and place it in a constant temperature water bath at 60°C to observe that the gelation time is 20 hours, the volume shrinkage rate is less than 1%, and it has good adhesion.

[0065] Inspection of blocking ability:

[0066] The plugging ability of the resin provided in this example was examined. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm are filled with quartz sand to produce high and low permeability simulated cores, which are recorded as 5# and 6#, and the original permeability is obtained after water flooding until the pressure is stable...

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Abstract

The invention relates to a high-strength resin plugging agent as well as a preparation method and application of the high-strength resin plugging agent. The high-strength resin plugging agent comprises the raw materials of unsaturated resin, a crosslinking agent and a polymerization inhibitor; the crosslinking agent is 0.5%-1% of the mass of the unsaturated resin; and the polymerization inhibitoris 0.75%-2% of the mass of the unsaturated resin. The high-strength resin plugging agent further comprises an additive being 5%-20% of the mass of the unsaturated resin. The gelation time of the high-strength resin plugging agent provided by the invention is adjustable within 3h-25h, and the high-strength resin plugging agent has the characteristics of high strength and long-term stability and issuitable for plugging large pores and fractured reservoirs for a long term.

Description

Technical field: [0001] The invention mainly relates to a high-strength resin plugging agent and its preparation method and application. The plugging agent is temperature-resistant and pressure-resistant and has long-term stability, and is applied in the technical field of oilfield chemistry. Background technique: [0002] In the process of oil field development, when the original energy of the oil layer begins to decrease, it is necessary to manually replenish energy to the formation, that is, to inject water into the oil reservoir to enhance oil recovery. However, due to the natural fractures, heterogeneity and difference in oil-water mobility ratio of the formation or improper production methods, the injected water will advance unevenly along the fracture seepage or high-permeability zone, resulting in premature water production from the oil well until it is flooded. At present, most oilfields developed by water flooding in my country have entered the stage of high water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 吴千慧葛际江孙翔宇仲宇欣宋龙飞潘逸平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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