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Hydrophobic hydroexpanding body regulating-driving agent

A technology of swelling and hydrophobicity, which is applied in the direction of drilling compositions, chemical instruments and methods, to achieve the effects of avoiding clogging, improving gel strength, and prolonging water absorption and swelling time

Active Publication Date: 2007-02-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of hydrophobic water-swelling agent and preparation method thereof, to solve the following problems existing in the use of the existing water-swelling body:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw materials: 500Kg of distilled water, 300Kg of acrylamide, 50Kg of calcium-based bentonite, 50Kg of lauryl acrylate, 1Kg of sodium persulfate, and 1Kg of N,N-methylenebisacrylamide.

[0039] Follow the preparation method strictly. ① Mix all the above raw materials together in an open mixing tank; the mixing time is 40 minutes, and the mixing temperature is 30°C; ② Pump the mixed raw material mixture into the polymerization reactor and heat it to 75°C , while vacuuming for 20 minutes, and then passing nitrogen for 1 hour; after the material is polymerized, keep it warm at 75°C for 15 hours; ③Use an air compressor to inject compressed air from the top of the reactor, and squeeze out the polymerized large water swelling body from the reactor , and then use a rubber pulverizer to crush to the required particle size; ④Sieve and pack the crushed particles according to the user's needs.

[0040] The water-absorbing swelling time of the hydrophobic water-swelling body is mo...

Embodiment 2

[0042] Raw materials: 600Kg of distilled water, 400Kg of acrylamide, 50Kg of calcium-based bentonite from Anqiu, Shandong, 100Kg of myristyl acrylate, 1Kg of sodium persulfate, and 1Kg of N,N-methylenebisacrylamide.

[0043] Strictly follow the preparation method, ① Mix all the above-mentioned raw materials together in proportion in a common open mixing tank; the mixing time is 40 minutes, and the mixing temperature should be lower than 32°C; ② Pump the mixed raw material mixture sent to the polymerization reactor, heated to 78°C, vacuumed for 20 minutes at the same time, and then passed nitrogen for 1 hour; after the material was polymerized, it was kept at 78°C for 14 hours; ③Inject compressed air from the top of the reactor with an air compressor, and the The polymerized large water-swelling body is extruded from the reactor, and then crushed to the required particle size with a rubber pulverizer; ④Sieve and pack the crushed particles according to the needs of the user.

[...

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PUM

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Abstract

A water conditioning agent for water-injection well can increase water-drive effect characterizing that the mass ratio of the raw material composition is: 1, deionized water: 40-70%, 2, acrylamide: 20-50%, 3 calcium bentonite: 4-15%, 4, acrylic ester alkylide: 5-10 5, sodium persulfute 0.1-0.5%, 6 N, N-methy lenebis acrylamide: 0.1~0.5%. The preparation method includes: 1, mixing the raw materials for 30 minutes under 35deg.C 2, polymerization: heating them in a reaction kettle to 70-80deg.C to be vacuum pumped for 20 minutes and inlet with nitrogen for 1 hour, then to be heat-insulated for 12-18 hours under 70-80deg.C 3, extruding the hydroexpansioner from the kettle and crushing it 4, sieving and packaging it, which reduces the hydrophilic property of hydro- expansioners.

Description

Technical field [0001] The invention relates to an oilfield chemical treatment agent, in particular to a control and displacement agent for water injection wells. Background technique [0002] At present, most oil fields on land in China have entered the stage of water flooding development. That is, water is injected into the formation from one or more wells, oil is produced from another or more wells, and the water is used to drive the oil to flow to the production well. This process is called oil displacement. It is assumed that the injected water can flow evenly around, and it is possible to drive as much oil in the formation as possible to the production well. In fact, due to various reasons, the injected water often flows in a certain direction in the formation, but does not reach other directions, resulting in poor water flooding effect. If a certain substance is injected into the water injection well, this substance can change the original flow direction of the inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/06
Inventor 葛洪江刘希君雷齐玲胡成亮
Owner PETROCHINA CO LTD