Medium-deep well crosslinked polymer gel plugging agent and preparation method thereof

A technology of cross-linked polymer and plugging agent, applied in the field of oil drilling, can solve the problems of short validity period, prone to complex downhole, poor plugging efficiency, etc.

Active Publication Date: 2016-01-06
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the conventional plugging method has played a role in the plugging project of oil drilling, there are disadvantages or deficiencies at the same time, such as low high temperature resistance, short validity period, poor plugging efficiency, large consumption of plugging materials, long plugging time, and High-temperature deep wells and geothermal wells have a poor plugging safety factor, and downhole c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of cross-linked polymer gel plugging agent for middle and deep wells of the present invention, comprises the following steps successively:

[0024] ⑴ Prepare raw materials with the following components and weight content, refined cotton sodium salt solution: 120 parts, acrylamide: 75 parts, ammonium persulfate: 13 parts, cerium sulfate: 2 parts, β-D-mannuronic acid (M): 4 parts, ammonium dihydrogen phosphate: 1 part, composite portland cement slurry: 100 parts and hybrid microfiber: 150 parts; the water-cement ratio of the composite portland cement slurry is 0.44;

[0025] (2) Add acrylamide to the refined cotton sodium salt solution, stir at a high speed of 400r / min for 10 minutes to fully mix the two, then stir at a medium speed at a speed of 300r / min, heat to 60°C while stirring at a medium speed maintain a constant temperature;

[0026] (3) Continuously feed nitrogen gas into the reaction product of step (2) and the reaction vessel. Aft...

Embodiment 2

[0032] A kind of preparation method of cross-linked polymer gel plugging agent for middle and deep wells of the present invention, comprises the following steps successively:

[0033] ⑴ Prepare raw materials with the following components and weight content, refined cotton sodium salt solution: 120 parts, acrylamide: 80 parts, ammonium persulfate: 15 parts, cerium sulfate: 3 parts, β-D-mannuronic acid (M): 4 parts, ammonium dihydrogen phosphate: 1.2 parts, composite Portland cement slurry: 100 parts and hybrid microfiber: 180 parts; the water-cement ratio of the composite Portland cement slurry is 0.44;

[0034] (2) Add acrylamide to the refined cotton sodium salt solution, stir at a high speed of 400r / min for 10 minutes to fully mix the two, then stir at a medium speed at a speed of 300r / min, heat to 60°C while stirring at a medium speed maintain a constant temperature;

[0035] (3) Continuously feed nitrogen gas into the reaction product of step (2) and the reaction vessel. ...

Embodiment 3

[0041] A kind of preparation method of cross-linked polymer gel plugging agent for middle and deep wells of the present invention, comprises the following steps successively:

[0042] ⑴ Prepare raw materials for the following components and weight content, refined cotton sodium salt solution: 120 parts, acrylamide: 85 parts, ammonium persulfate: 17 parts, cerium sulfate: 5 parts, β-D-mannuronic acid (M): 4 parts, ammonium dihydrogen phosphate: 1.5 parts, composite Portland cement slurry: 100 parts and hybrid microfiber: 200 parts; the water-cement ratio of the composite Portland cement slurry is 0.44;

[0043] (2) Add acrylamide to the refined cotton sodium salt solution, stir at a high speed of 400r / min for 10 minutes to fully mix the two, then stir at a medium speed at a speed of 300r / min, heat to 60°C while stirring at a medium speed maintain a constant temperature;

[0044] (3) Continuously feed nitrogen gas into the reaction product of step (2) and the reaction vessel. A...

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PUM

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Abstract

The invention relates to a medium-deep well crosslinked polymer gel plugging agent and a preparation method thereof. The plugging agent comprises the raw materials of, by weight, 120 parts of a refined cotton sodium salt solution, 75-85 parts of acrylamide, 13-17 parts of ammonium persulfate, 2-5 parts of cerium sulfate, 4 parts of beta-D-mannuronic acid (M), 1-1.5 parts of ammonium dihydrogen phosphate, 100 parts of composite Portland cement slurry, and 150-200 parts of hybrid microfiber. The water-cement ratio of the composite Portland cement slurry is 0.44. According to the invention, acrylamide, ammonium persulfate and cerium sulfate particles are sequentially added into refined cotton sodium salt solution, such that crosslinked polymer gel is obtained; the beta-D-mannuronic acid (M) is added; the composite Portland cement slurry and the hybrid microfiber are added; the ammonium dihydrogen phosphate is added, and the mixture is well mixed, such that the medium-deep well crosslinked polymer gel plugging agent is obtained. The medium-deep well crosslinked polymer gel plugging agent has high high-temperature resistance and high compressive strength, and is reliable in plugging.

Description

technical field [0001] The invention relates to a crosslinked polymer gel plugging agent for medium and deep wells, and also relates to a preparation method for the crosslinked polymer gel plugging agent for medium and deep wells, belonging to the technical field of petroleum drilling. Background technique [0002] Lost circulation is a technical problem often encountered in the drilling process, especially high-temperature lost circulation will cause a large loss of drilling fluid, leading to an increase in drilling costs, and at the same time, it will cause changes in bottomhole pressure, induce wellbore instability, well collapse, The occurrence of complex accidents such as well kick and blowout seriously restricts the improvement of drilling speed. [0003] At present, when oil drilling encounters a high-temperature formation loss section, due to the lack of high-temperature resistant plugging technology, conventional plugging agents are generally used for plugging. In ...

Claims

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Application Information

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IPC IPC(8): C09K8/467C08F251/02C08F220/56
CPCC08F251/02C09K8/426C09K8/467C09K2208/18C08F220/56
Inventor 许春田汤燕丹于培志陈小元于澄李爱红贾丽君徐罗凤严沾张珑珑
Owner SINOPEC SSC
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