Hydrolysiable high elastic well remending liquid temperary blocking agent

A technology of workover fluid and temporary plugging agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc. It can solve the problems of easy leakage, high density of inorganic salt solution, and difficulty in brine sticking and plugging, and achieve less residue , easy to degrade and prevent leakage

Active Publication Date: 2006-11-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the density of the inorganic salt solution is relatively high, and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Raw materials (all are commercially available industrial products): 40% deionized water, 30% acrylic acid, 29.9% corn starch, 0.05% sodium persulfate, and 0.05% N,N-methylenebisacrylamide. Mix the above materials evenly and polymerize in a polymerization reactor for 14 to 18 hours to obtain a rubber-like high-elastic gel. Extrude the polymerized product from the polymerization reactor and process it into irregular strips and sheets with a single-screw plastic extruder. The hydrolyzable high-elastic workover fluid temporary plugging agent is obtained, and the hydrolyzable high-elastic workover fluid temporary plugging agent is mixed into 0.2% guar gum aqueous solution, and then injected into the well together with a cement truck. Layer dosage is 20-100Kg.

Embodiment 2

[0039] Raw materials (both commercially available industrial products): 50% deionized water, 30% acrylic acid, 19.9% ​​potato starch, 0.05% potassium persulfate, and 0.05% N,N-methylenebisacrylamide. Mix the above materials evenly and polymerize in the polymerization reactor for 10-18 hours to obtain a rubber-like high-elastic gel, extrude the polymerized product from the polymerization reactor, and process it into irregular strips and sheets with a single-screw plastic extruder The hydrolyzable high-elastic workover fluid temporary plugging agent is obtained. When applying, the hydrolyzable high-elastic workover fluid temporary plugging agent is mixed into 0.2% guar gum aqueous solution, and then injected into the well together with a cement truck, which can hydrolyze high The amount of elastic workover fluid temporary plugging agent per meter of lost layer is 20-50Kg.

Embodiment 3

[0041] Raw materials (all are commercially available industrial products): 60% deionized water, 20% acrylic acid, 19.8% corn starch, 0.1% sodium persulfate, and 0.1% N,N-methylenebisacrylamide. Mix the above materials evenly and polymerize in a polymerization reactor for 14 to 18 hours to obtain a rubber-like high-elastic gel. Extrude the polymerized product from the polymerization reactor and process it into irregular strips and sheets with a single-screw plastic extruder. The hydrolyzable high-elastic workover fluid temporary plugging agent is obtained, and the hydrolyzable high-elastic workover fluid temporary plugging agent is mixed into 0.2% guar gum aqueous solution, and then injected into the well together with a cement truck. Layer dosage is 20-80Kg.

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PUM

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Abstract

The invention relates to hydrolysable high elasticity well workover liquid temporary blocking agent used in oil field workover treatment. It is made up of 40-80% de-ionized water, 10-30% acrylic acid, 8-30% starch, 0.1-1.5% sodium per-sulfate, and 0.1-1.0% N,N-methylene-bisacrylamide. The water-bearing of the product is 40%-80%. It can be degraded easily in water, and can lose full strength in 24 hours below 60 centigrade degree. The degraded residue is little and has low system viscosity.

Description

technical field [0001] The invention relates to oilfield workover operations, in particular to a hydrolyzable high-elastic workover fluid temporary plugging agent. Background technique [0002] At present, most of my country's onshore oil fields have entered the middle and late stages of development, the pressure of oil and gas wells has been decreasing year by year, and workover fluid leakage often occurs. The leakage of workover fluid during the workover operation not only increases the amount of workover fluid, which makes the workover operation impossible, but also may cause oil layer (formation) pollution, affecting the output after workover operation. [0003] At present, there are mainly the following methods to solve this problem: [0004] (1) Add oil-soluble resin to the workover fluid. The principle of this method is to use oil-soluble resin to seal the formation to reduce leakage. After the workover operation, the oil-soluble resin is dissolved by the crude oil...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 葛红江刘希君雷齐玲
Owner PETROCHINA CO LTD
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