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A kind of preparation method of water-absorbent resin plugging agent

A technology of water-absorbing resin and plugging agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient strength and poor high temperature resistance, and achieve the effects of simple operation, good viscoelasticity and simple process

Inactive Publication Date: 2011-12-28
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a method for preparing a high-temperature and high-strength water-absorbing resin plugging agent in order to overcome the shortcomings of insufficient strength and poor high-temperature resistance existing in the existing water-absorbing resin plugging technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Weigh 103.6g of 2-acrylamido-2-methylpropanesulfonic acid, adjust the pH of the system to neutral, add 3.10g of crosslinking agent N,N-methylenebisacrylamide, and initiator persulfuric acid Ammonium 0.23g and sodium bisulfite 0.26g, mixed with a suitable amount of water to make 500mL solution, add 300g of powdered inorganic filler silicon powder, stir and dissolve uniformly, react at room temperature to obtain block resin, cut the resin into small pieces spare. A 6mol / L acrylamide solution was prepared, in which 0.012mol / L initiator ammonium persulfate was dissolved, a small piece of resin was soaked in the solution, and the solution was taken out after the liquid was saturated, and heated to initiate polymerization to obtain a water-absorbent resin plugging agent.

Embodiment 2

[0019] Example 2: Weigh 71.08g of acrylamide, adjust the system pH to neutral, add 3.1g of crosslinking agent N,N-methylenebisacrylamide, initiator of ammonium persulfate 0.011g and sodium metabisulfite 0.010g, use appropriate amount Prepare 500mL of water into the solution, add 40g of powdery inorganic filler bentonite, stir and dissolve uniformly, react at room temperature to obtain a block resin, and cut the resin into small pieces for later use. Prepare a 2mol / L acrylic acid solution in which 0.02mol / L crosslinking agent N,N-methylenebisacrylamide and 0.0002mol / L initiator potassium persulfate are dissolved, and small pieces of resin are soaked in the solution After the liquid is saturated, it is taken out and heated to initiate polymerization to obtain a water-absorbent resin plugging agent.

Embodiment 3

[0020] Example 3: Weigh 24.78g of N,N-dimethylacrylamide, adjust the pH of the system to neutral, add 2.31g of crosslinking agent N,N-methylenebisacrylamide, initiator potassium persulfate 0.068g and Sodium bisulfite 0.026g, mixed with appropriate amount of water to make 500mL solution, add 25g of powdered inorganic filler vermiculite powder, stir and dissolve uniformly, react at room temperature to obtain block resin, cut the resin into small pieces for later use. Prepare a 4mol / L acrylamide solution in which 0.02mol / L crosslinking agent N,N-methylenebisacrylamide and 0.004mol / L initiator ammonium persulfate are dissolved, and a small piece of resin is in the solution Soak, take out after absorbing liquid saturation, heat to initiate polymerization to obtain water absorbing resin plugging agent.

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PUM

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Abstract

The invention relates to a preparation method of an absorbent resin plugging agent, belonging to the technical field of oilfield chemistry. The preparation method comprises the following steps: (1) dissolving a monomer A with water to obtain a solution with a certain concentration, regulating the pH of the solution to be neutral, adding a crosslinking agent, an initiator and a powdery inorganic filling material, evenly stirring and then standing, and reacting at room temperature so as to obtain a block resin; and (2) shearing the resin into small blocks, soaking the sheared resin blocks in the solution containing a monomer B, the initiator and the crosslinking agent, taking out the resin blocks after getting saturated, heating to initiate polymerization so as to obtain the absorbent resinplugging agent. The preparation method is simple in process and convenient to operate; the obtained product has extremely good viscoelasticity and flexibility, the compression strength of the obtained product reaches 20MPa and is more than then times or scores of times that of common absorbent resin plugging agents, the water absorption multiple of the obtained product is 3-30 times; and the absorbent resin plugging agent prepared by the method in the invention can bear a high temperature of 150 DEG C for a long term, and can be used for plugging operations of a deep well and a super-deep well in the petroleum drilling process.

Description

Technical field [0001] The invention relates to a preparation method of a water-absorbing resin plugging agent, which belongs to the technical field of oil field chemistry, in particular to a petroleum drilling plugging agent. Background technique [0002] Lost circulation is a common phenomenon in the process of drilling. The time spent dealing with lost circulation during drilling operations accounts for about 10% of the drilling time. The common method to prevent leakage is to add materials of different particle sizes in the drilling fluid to form a kind of bridge or cluster in the micro-cracks or pores to prevent the leakage of the drilling fluid. When leakage occurs during drilling, effective leak-stopping measures must be taken. Bridge plugging is one of the effective methods of plugging. The key to the success or failure of plugging lies in whether the size distribution of the plugging particles matches the diameter of the missing channel. The optimal size range is from 1...

Claims

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Application Information

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IPC IPC(8): C08F265/10C08F265/02C08K3/34C09K8/42
Inventor 赖小林郭建华周亚贤姜雪清李旭东刘文堂
Owner CHINA PETROCHEMICAL CORP
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