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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] First weigh 40g acrylamide, 20g 2-acrylamido-2-methylpropanesulfonic acid, 0.08g N,N-methylenebisacrylamide and 0.04g initiator ammonium persulfate into the reactor, add 300g distilled water, Stir in ice water bath until completely dissolved, pass N 2 Protection; When the temperature drops to about 2℃, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.04g); after dripping, continue stirring for 15min, stop stirring, slowly warm up to 50℃, static reaction for 3h, get elastic gel Take it out, vacuum dry at 70°C, and shear to obtain the water-absorbing swelling plugging agent No. 1 product without hydrophobic modification.

Example Embodiment

[0021] Example 2

[0022] First weigh 50g acrylamide, 25g 2-acrylamido-2-methylpropanesulfonic acid, 0.08g N,N-methylenebisacrylamide and 0.04g initiator ammonium persulfate into the reactor, add 350g distilled water, Stir in an ice water bath until completely dissolved; slowly add 6g enhancer sodium bentonite and 5g hydrophobic monomer sodium 2-acrylamide dodecyl sulfonate, continue to stir evenly at low temperature, pass N 2 Protection; when the temperature drops to about 2℃, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.04g); after dripping, continue to stir for 15min, stop stirring, slowly warm up to 50℃, static reaction for 3h, get elastic gel Take it out, vacuum dry at 70°C, and shear to obtain No. 2 product of delayed water swelling plugging agent.

Example Embodiment

[0023] Example 3

[0024] First weigh 40g acrylamide, 25g 2-acrylamido-2-methylpropanesulfonic acid, 0.06g N,N-methylenebisacrylamide and 0.03g initiator sodium persulfate into the reactor, add 350g distilled water, Stir in an ice water bath until completely dissolved; slowly add 3g enhancer kaolin and 2g hydrophobic monomer octadecyltrimethylammonium chloride, continue to stir evenly at low temperature, pass N 2 Protection; when the temperature drops to about 2℃, slowly add 30g of initiator sodium sulfite solution (sodium sulfite 0.03g); after dripping, continue stirring for 15min, stop stirring, slowly warm up to 50℃, static reaction for 3h, get elastic gel Take it out, vacuum dry at 70°C, and shear to obtain 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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