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Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent

A gel and deep technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of destroying the polymer gel network structure, reducing the crosslinking strength of the gel, and affecting the effect of field application, etc., to achieve the preparation Simplicity, small change in strength, and excellent heat resistance

Active Publication Date: 2014-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thermal degradation of polyacrylamide in high temperature environment, the crosslinking strength of jelly is reduced, and the field application effect is affected.
In recent years, the jelly developed with polyacrylamide polymer as the main agent mainly includes chromium jelly, zirconium jelly, phenolic resin jelly, polyethyleneimine jelly, etc. The disadvantage of these jelly is that when the temperature exceeds After 110°C, the high temperature will destroy the network structure of the polymer jelly, resulting in low strength and poor stability of the formed jelly, or even failure to freeze.
This composite jelly gel plugging agent is not suitable for plugging adjustment in oil reservoirs with a temperature exceeding 90°C

Method used

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  • Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent
  • Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent
  • Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent

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Experimental program
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Effect test

Embodiment 1

[0035] In 50 g of nonionic polyacrylamide aqueous solution with a mass fraction of 0.4%, add 0.3 g of urotropine solid powder while stirring, then add 0.3 g of hydroquinone solid powder, then add 0.015 g of temperature stabilizer sodium sulfite and stir until All the medicines are dissolved in the aqueous solution, and finally 0.06 g of sodium hydroxide solution (pH regulator) with a mass fraction of 10.0% is added to adjust the pH value of the system to 8.01, and the jelly forming gel of the present invention is obtained by stirring evenly. The jelly has a gelation time of 36 hours at 110° C. and a gelation time of 23 hours at 130° C.

Embodiment 2

[0037] In 50 g of nonionic polyacrylamide aqueous solution with a mass fraction of 0.5%, add 0.4 g of urotropine solid powder while stirring, then add 0.4 g of hydroquinone solid powder, then add 0.015 g of temperature stabilizer sodium sulfite and stir until All the medicines are dissolved in the aqueous solution, and finally 0.17 g of sodium hydroxide solution (pH regulator) with a mass fraction of 10.0% is added to adjust the pH value of the system to 8.48, and the jelly forming gel of the present invention is obtained by stirring evenly. The gelling time of the jelly was 25 hours at 110° C., and 11 hours at 130° C.

Embodiment 3

[0039] In 50 g of nonionic polyacrylamide aqueous solution with a mass fraction of 0.6%, add 0.5 g of urotropine solid powder while stirring, then add 0.5 g of hydroquinone solid powder, then add 0.015 g of temperature stabilizer sodium sulfite and stir until All the medicines are dissolved in the aqueous solution, and finally 0.4 g of sodium hydroxide solution (pH regulator) with a mass fraction of 10.0% is added to adjust the pH value of the system to 8.92, and the jelly forming gel of the present invention is obtained by stirring evenly. The jelly has a gelation time of 21 hours at 110° C., and a gelation time of 8 hours at 130° C.

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Abstract

The invention relates to a gel plugging agent for deep profile control of a higher temperature oil reservoir, and a preparation method of the gel plugging agent. The gel plugging agent comprises 0.3-0.8 percent of nonionic polyacrylamide, 0.6-1.3 percent of a cross-linking agent A, 0.45-1.44 percent of a cross-linking agent B, 0.02-0.04 percent of a temperature stabilizer and 0.01-0.08 percent of a pH value regulator, wherein the cross-linking agent A is methenamine; the cross-ling agent B is hydroquinone or resorcinol; the temperature stabilizer is sodium thiosulfate, sodium bisulfite or sodium sulfite; and the pH regulator is sodium hydroxide, potassium hydroxide, sodium carbonate or sodium bicarbonate. The gel plugging agent disclosed by the invention has strong temperature resisting performance and can be used for the profile control operation of the high temperature oil reservoir with 100-160DEG C; the gel plugging agent has the characteristics of high strength after being gelatinized, stronger plugging capability for the stratum and favorable thermal stability; and in addition, after the gel plugging agent is stood at the temperature of 130 DEG C for 90 days, the strength change is little and gel breaking and hydration are avoided.

Description

technical field [0001] The invention relates to an agent for water plugging and profile control of high-temperature oil reservoirs, in particular to a jelly-type plugging agent for deep water plugging and profile modification of high-temperature oil reservoirs and a preparation method thereof. technical background [0002] With the gradual exploitation of oil fields, the water output of oil wells is becoming more and more serious. At present, the average water content of oil wells has reached more than 80%. Therefore, the work of profile control and water plugging has been more and more widely used. Whether it is water plugging of oil wells or profile control of water injection wells, the most effective method at present is to use chemical agents to block the water-producing faults by chemical means. Due to the increasingly harsh oil production conditions, the development of water plugging and profile control agents under high temperature conditions has become an inevitable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42C08J3/24
Inventor 戴彩丽由庆刘学哲赵明伟汪卫东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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