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High-temperature-resistant organic temporary plugging agent and preparation method thereof

A technology of high temperature resistance and temporary plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of difficulty in quality control and field application, complicated production process of temporary plugging agent, incomplete degradation, etc. Degradation and flowback, high success rate of temporary plugging, and short recovery period of oil wells

Inactive Publication Date: 2017-01-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temporary plugging agents reported in these patents generally have shortcomings such as complicated production process, low temperature resistance or incomplete degradation, which brings great difficulties to the quality control and field application of this type of product

Method used

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  • High-temperature-resistant organic temporary plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Add 20g of acrylic acid, 40g of acrylamide, 20g of 2-acrylamide-2-methylpropanesulfonic acid, and 2g of N,N-methylenebisacrylamide to 9.3g of water in sequence at room temperature, mix the solution evenly, and use Sodium carbonate neutralizes the solution to pH = 6.5-7.0, put the solution in an open container, add 0.084g of sodium bisulfite and 0.084g of ammonium persulfate and stir evenly, and wait for initiation. A solid polymer is obtained through the reaction, and the polymer is pulverized to obtain an anti-high temperature organic temporary plugging agent.

Embodiment 2

[0032] Example 2: Add 20g of acrylic acid, 40g of acrylamide, 20g of 2-acrylamide-2-methylpropanesulfonic acid, and 2g of N,N-methylenebisacrylamide to 9.3g of water in sequence at room temperature, mix the solution evenly, and use Sodium carbonate neutralizes the solution to pH = 6.5-7.0, put the solution in an open container, add 0.084g sodium bisulfite and 0.084g potassium persulfate, stir well, and wait for initiation. A solid polymer is obtained through the reaction, and the polymer is pulverized to obtain an anti-high temperature organic temporary plugging agent.

Embodiment 3

[0033] Example 3: Add 20g of acrylic acid, 40g of acrylamide, 20g of 2-acrylamide-2-methylpropanesulfonic acid, and 2g of N,N-methylenebisacrylamide to 9.3g of water in sequence at room temperature, mix the solution evenly, and use Sodium carbonate neutralizes the solution to pH = 6.5-7.0, put the solution in an open container, add 0.084g of ammonium bisulfite and 0.084g of sodium persulfate and stir evenly, and wait for initiation. A solid polymer is obtained through the reaction, and the polymer is pulverized to obtain an anti-high temperature organic temporary plugging agent.

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Abstract

The invention relates to a high-temperature-resistant organic temporary plugging agent and a preparation method thereof. The high-temperature-resistant organic temporary plugging agent comprises, by weight percentage, 10% of water, 30% of acrylamide, 15-45% of acrylic acid, 15-30% of 2-acrylamide-2-methyl propane sulfonic acid, 3-6% of N, N-methylene bisacrylamide, 0.1-0.5% of oxidizing agent and 0.1-0.5% of reducing agent. The preparation method includes: sequentially adding the water, the acrylic acid and the acrylamide into a container, starting stirring, adding the 2-acrylamide-2-methyl propane sulfonic acid and the N, N-methylene bisacrylamide, and stirring until complete dissolving is achieved; using sodium carbonate to regulate pH of the solution to 6.5-7.0; adding the oxidizing agent and the reducing agent, acquiring solid polymer after the reaction, and crushing to obtain the high-temperature-resistant organic temporary plugging agent. The high-temperature-resistant organic temporary plugging agent is simple in site construction process, high in temperature resistance, high in temporary plugging success rate, low in use amount, easy to degrade and flow back and short in oil well recovery cycle, and the temperature resistance of the high-temperature-resistant organic temporary plugging agent is not smaller than 140 DEG C.

Description

technical field [0001] The invention relates to a high-temperature resistant organic temporary plugging agent for workover fluid and a preparation method thereof, belonging to the technical field of drilling and completion fluids. Background technique [0002] During workover operations, a large amount of workover fluid is likely to leak into the reservoir, causing problems such as hydration expansion of reservoir clay, migration of clay particles, and oil-water emulsification, which makes the oil well production recovery time longer. In order to protect the oil-producing reservoirs from being polluted by external workover fluids, a temporary plugging agent can be injected under certain technological conditions to temporarily block the oil-producing reservoirs so that the workover fluid cannot invade the reservoirs. After a period of time, the temporary plugging agent Slowly break the gel, and flow out with the production fluid when the production capacity is restored. [0...

Claims

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Application Information

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IPC IPC(8): C09K8/508
CPCC09K8/5083C09K2208/18
Inventor 王仲广任奕权宝华任强杨凯王铁刚
Owner CHINA NAT OFFSHORE OIL CORP
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