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Delay water absorption expansion leakage blocking agent and preparation method thereof

A water-absorbing expansion and plugging agent technology, which is applied in the field of plugging aids, can solve the problems of reduced swelling performance and achieve the effects of delaying expansion, enhancing plugging strength, and improving pressure bearing capacity

Inactive Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that conventional expansive materials rapidly expand in the wellbore and the expansion performance decreases after entering the lost zone, and the development of a plugging agent with a certain time-delayed expansion performance can make the plugging material play the best role in the lost channel Improve the practical application effect of plugging materials

Method used

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  • Delay water absorption expansion leakage blocking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First weigh 40g of acrylamide, 20g of 2-acrylamido-2-methylpropanesulfonic acid, 0.08g of N,N-methylenebisacrylamide and 0.04g of initiator ammonium persulfate into the reactor, add 300g of distilled water, Stir in an ice-water bath until completely dissolved, pass N 2 Protection; when the temperature drops to about 2°C, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.04g) dropwise; after dropping, continue to stir for 15min, stop stirring, slowly raise the temperature to 50°C, and statically react for 3h to obtain an elastic gel body; it was taken out, vacuum-dried at 70°C, and sheared to obtain the No. 1 product of water-absorbing swelling plugging agent without hydrophobic modification.

Embodiment 2

[0022] First weigh 50g of acrylamide, 25g of 2-acrylamido-2-methylpropanesulfonic acid, 0.08g of N,N-methylenebisacrylamide and 0.04g of initiator ammonium persulfate into the reactor, add 350g of distilled water, Stir in an ice-water bath until completely dissolved; slowly add 6g of enhancer sodium bentonite and 5g of hydrophobic monomer 2-acrylamide sodium dodecylsulfonate, continue to stir at low temperature evenly, pass N 2 Protection; when the temperature drops to about 2°C, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.04g) dropwise; after dropping, continue to stir for 15min, stop stirring, slowly raise the temperature to 50°C, and statically react for 3h to obtain an elastic gel body; it was taken out, vacuum-dried at 70°C, and sheared to obtain the No. 2 product of delayed water-swelling plugging agent.

Embodiment 3

[0024] First weigh 40g of acrylamide, 25g of 2-acrylamido-2-methylpropanesulfonic acid, 0.06g of N,N-methylenebisacrylamide and 0.03g of initiator sodium persulfate into the reactor, add 350g of distilled water, Stir in an ice-water bath until completely dissolved; slowly add 3g of enhancer kaolin and 2g of hydrophobic monomer octadecyltrimethylammonium chloride, continue to stir at low temperature evenly, pass N 2 Protection; when the temperature drops to about 2°C, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.03g) dropwise; after dropping, continue to stir for 15min, stop stirring, slowly raise the temperature to 50°C, and statically react for 3h to obtain an elastic gel body; it was taken out, vacuum-dried at 70°C, and sheared to obtain the No. 3 product of delayed water-swelling plugging agent.

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Abstract

The invention relates to a preparation method of a leakage blocking auxiliary agent in the field of oil field well drilling. The method comprises the following steps of (1) firstly weighing a certainamount of acrylamide, 2-acrylamide-2-methallyl sulfonate, N,N-methylene bisacrylamide and initiators; putting the materials into a reactor; adding the corresponding amount of distilled water and ice water bath; performing stirring to complete dissolution; (2) slowly adding enhancing agents and hydrophobic monomers; performing low-temperature stirring; introducing N2 for protection; (3) lowering the temperature to 0 to 10 DEG C; dripping an initiator solution; (4) after the dripping completion, continuously performing stirring for 15min; raising the temperature to 50 DEG C; performing still state reaction for 2 to 5h to obtain an elastic gel body; (5) taking out the elastic gel body; performing vacuum drying at 60 to 90 DEG C and shearing to obtain a delay water absorption expansion leakageblocking agent product. The method has the advantages that the obvious delay expansion features are realized; the expansion in a shaft is slow; after reaching the leakage zone, the expansion can be continuously performed, so that the leakage zone can be effectively improved; the restoration effect is achieved.

Description

technical field [0001] The invention relates to a plugging aid used in the field of oilfield drilling, in particular, it can regulate the expansion time of the plugging material and improve the success rate of construction of the expansion plugging material. technical background [0002] Lost circulation is a complex problem in the process of drilling, cementing, logging, and workover. It causes drilling fluid to leak from the wellbore into the lost channel, which not only consumes a lot of mud and plugging materials, but also may cause well collapse and pipe sticking. , blowout, and even lead to major accidents such as wellbore scrapping, resulting in huge economic losses. Due to the high incidence of lost circulation, according to statistics, the incidence of lost circulation in the world accounts for 20% to 25% of the total number of drilling wells, and the treatment of lost circulation is a difficult point in oil drilling, especially the problem of complex lost circulati...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F2/44C09K8/44
CPCC08F2/44C08F220/56C09K8/426C09K8/44C08F220/585C08F222/385
Inventor 曾志强袁俊秀黄冬朱魁逯贵广靳志超
Owner CHINA PETROLEUM & CHEM CORP
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