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Novel slow-expansion plugging material and preparation method thereof

A plugging material and slow expansion technology, applied in the field of plugging materials, can solve problems such as failure to achieve a good plugging effect, loss of continuous expansion, etc.

Active Publication Date: 2021-09-14
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The technical problem to be solved by the present invention is that most of the expansive materials expand rapidly in the wellbore and lose the ability to continue to expand after entering the leakage layer, so they cannot play a good sealing role. Blocking effect

Method used

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  • Novel slow-expansion plugging material and preparation method thereof
  • Novel slow-expansion plugging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100g of distilled water, 10g of acrylamide, 10g of 2-acrylamido-2-methylpropanesulfonic acid, 0.04g of a mixture of sodium sulfite and ammonium persulfate, 0.004g of N,N-methylenebisacrylamide, and 11.912g of bentonite into the reactor , 5°C, high-speed stirring and mixing under nitrogen protection conditions, slowly warming up to 20°C, to obtain a viscous system, then pour it into a mixture of 8g methyl methacrylate and 2-acrylamido-2-methylpropane In a reactor containing a mixture of methyl sulfonate (mass ratio 2.5:1), 0.004g divinylbenzene, and 0.04g benzoyl peroxide, stir at a high speed of 5000 rpm for 60min, and slowly heat up to 50°C , stop stirring, and let it stand for 1 hour to react. After the product is dried and pulverized, it becomes slow-swelling plugging material 1#.

Embodiment 2

[0025] Add 100g of distilled water, 14g of acrylamide, 14g of acrylic acid, 0.2g of a mixture of sodium sulfite and ammonium persulfate, 0.12g of N,N-methylenebisacrylamide, and 9.36g of bentonite into the reactor, and stir and mix at a high speed under nitrogen protection at 3°C , slowly warming up to 20°C to obtain a viscous system, which was then poured into a mixture containing 2g of methyl methacrylate and 2-acrylamido-2-methylpropanesulfonate (mass ratio 2.5: 1) In a reactor containing 0.12g of divinylbenzene and 0.2g of benzoyl peroxide, stir at a high speed of 5000 rpm for 60 minutes, slowly raise the temperature to 50°C, stop stirring, and let it stand for 1 hour to react. After being dried and pulverized, it becomes slow-swelling plugging material 2#.

Embodiment 3

[0027] Add 100g of distilled water, 8g of acrylic acid, 8g of methacrylamide, 0.2g of a mixture of sodium sulfite and ammonium persulfate, 0.12g of N,N-methylenebisacrylamide, and 15.36g of kaolin into the reactor. Stir and mix, and slowly heat up to 20°C to obtain a viscous system, which is then poured into a mixture containing 8g of ethyl acrylate and 2-acrylamido-2-methylpropanesulfonate (mass ratio 2.5: 1) In a reactor containing 0.12g of divinylbenzene and 0.2g of benzoyl peroxide, stir at a high speed of 5000 rpm for 30 minutes, slowly raise the temperature to 60°C, stop stirring, and let it stand for 4 hours to react. After being dried and pulverized, it becomes slow-swelling plugging material 3#.

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Abstract

The invention relates to a slow-expansion plugging material used in the field of oilfield drilling. The preparation method comprises the following steps: sequentially adding distilled water, a water-soluble polymeric monomer, a water-soluble initiator, a water-soluble cross-linking agent and an inorganic reinforcing agent, stirring and mixing at a high speed at 0-5 DEG C under the protection of nitrogen, slowly heating until the system becomes viscous, pouring the viscous system into a prepared oil-engine system of an oil-soluble polymeric monomer, an oil-soluble initiator and an oil-soluble cross-linking agent, and carrying out heating reaction to prepare the slow-expansion plugging material. The product disclosed by the invention has an obvious expansion delaying effect, and the expansion retarding and plugging material still has relatively strong expansion capacity after 48 hours.

Description

technical field [0001] The invention relates to a plugging material used in the field of oil field drilling. The plugging material has the effect of slowly expanding when meeting water. Background technique [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. [0003] 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 circulation is particularly difficult. The loss of lost circulation acco...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467Y02P20/141
Inventor 曾志强袁俊秀黄冬王康魏开轩
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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