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Polyethyleneimine jelly profile-control water-blocking agent

A technology of polyethyleneimine and profile control water blocking agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance and achieve good erosion resistance and gel base fluid Low viscosity and good thermal stability

Inactive Publication Date: 2014-03-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, polyethyleneimine jelly is a potential plugging agent in high-temperature and high-salt reservoir water plugging and profile control technology, but the temperature resistance of the plugging agent will deteriorate after a long period of storage

Method used

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  • Polyethyleneimine jelly profile-control water-blocking agent
  • Polyethyleneimine jelly profile-control water-blocking agent
  • Polyethyleneimine jelly profile-control water-blocking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Add 0.6 g of sodium sulfite and 0.7 g of anionic polyacrylamide with a molecular weight of 16 million to 100 g of NaCl aqueous solution with a salinity of 10,000 mg / L, stir at room temperature for 2-3 hours until the anionic polyacrylamide is completely dissolved, and then Add 0.3g of cross-linking agent polyethyleneimine with a molecular weight of 20000 and stir evenly to obtain polyethyleneimine gel profile control and water blocking agent. The profile control and water shutoff agent freezes for 16 hours at 110°C, and the jelly strength is 0.052MPa.

Embodiment 2

[0013] Example 2: Add 0.8 g of thiourea and 0.7 g of anionic polyacrylamide with a molecular weight of 14 million to 100 g of NaCl aqueous solution with a salinity of 20,000 mg / L, and stir at room temperature for 2-3 hours until the anionic polyacrylamide is completely dissolved. Then add 0.3 g of cross-linking agent polyethyleneimine PEI with a molecular weight of 10,000 and stir evenly to obtain polyethyleneimine gel profile control and water shutoff agent. The profile control water shutoff agent system freezes for 23 hours at 110°C, and the jelly strength is 0.064MPa.

Embodiment 3

[0014] Example 3: Add 0.6 g of sodium bisulfite and 0.8 g of anionic polyacrylamide with a molecular weight of 12 million to 100 g of NaCl aqueous solution with a salinity of 30,000 mg / L, and stir at room temperature for 2-3 hours until the polyacrylamide is completely dissolved. Then add 0.3 g of polyethyleneimine PEI, a cross-linking agent with a molecular weight of 10,000, and stir evenly to obtain the polyethyleneimine gel profile control and water blocking agent. The profile control and water shutoff system freezes for 26 hours at 110°C, and the jelly strength is 0.074MPa.

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Abstract

The invention provides a polyethyleneimine jelly profile-control water-blocking agent. The profile-control water-blocking agent is prepared by reacting partially-hydrolyzed polyacrylamide and a cross-linking agent polyethyleneimine. The profile-control water-blocking agent comprises following components by weight: 0.3-0.8% of the partially-hydrolyzed polyacrylamide, 0.2-0.5% of the cross-linking agent polyethyleneimine and 0.3-0.8% of an additive, with the balance being water, wherein the partially-hydrolyzed polyacrylamide adopts anionic polyacrylamide, and the additive is one compound selected from a group of sodium sulfite, sodium bisulfate, and sodium hyposulfite or thiourea, or is a mixture of several compounds selected from the group. The jelly forming time of the profile-control water-blocking agent is adjustable and the jelly has high strength. The profile-control water-blocking agent can block underground water having a temperature lower than 110 DEG C and a NaCl mineralization degree of 50000 mg / L. The profile-control water-blocking agent has good temperature toleration and cannot be dehydrated for 120 days.

Description

technical field [0001] The invention relates to a jelly profile control water shutoff agent for oil field profile control water shutoff and belongs to the technical field of oilfield oil layer profile control water shutoff. Background technique [0002] At present, profile control of water injection wells and water plugging of oil wells are important measures to enhance oil recovery in tertiary oil recovery. The research on plugging agent is an extremely important link related to the success of profile control and water plugging. For conventional oil reservoirs, plugging agents have been produced on a large scale, and breakthroughs have been made in enhancing oil recovery. However, due to the characteristics of high temperature and high salinity in high temperature and high salinity reservoirs, the stability of the plugging agent is poor, and eventually the plugging agent cannot achieve the proper plugging effect. The existing profile control and water shutoff agents usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C08G81/02
CPCC09K8/512C08G81/024C08G2210/00C09K8/5045C09K8/506
Inventor 周洪涛刘雪辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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