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Gel water plugging agent and preparation method thereof

A technology of water shutoff agent and gel, which is applied in the field of gel water shutoff agent and its preparation, which can solve the problems of rising failure rate of chemical water shutoff technology with immovable strings, inability to control and plug in deep formations, loss of deformability of products, etc. problems, to achieve the effect of reducing construction cost, good sealing performance and good thermal stability

Active Publication Date: 2021-12-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in view of the harsh geological conditions of the oilfield, most of the commonly used jelly-type water plugging agents are difficult to meet the requirements of high temperature resistance and high salinity. Problems with short spin cycles
[0004] At present, the commonly used chemical water blocking agents mainly composed of cross-linked polymer particles are made by adding phenolic resin cross-linking agent after acrylamide polymerization or polyacrylamide hydrolysis; under the condition of high temperature and high salinity, some The amide group will undergo hydrolysis and react with calcium and magnesium ions in the formation, resulting in dehydration or even hardening of the product and loss of deformability, which cannot play a role in profile control and plugging in deep formations, which in turn leads to a large failure rate of the chemical water plugging process without moving strings rise
[0005] Therefore, it is necessary to study a high-strength chemical water shutoff formula system that can satisfy high-temperature and high-salt formations at the same time, and ensure that the agent system has good injectability and excellent anti-shear and anti-adsorption performance. Provide chemical support for profile control and water plugging, and solve the problem of oil well water production that currently plagues high-temperature high-salt oilfields and high-temperature reservoirs

Method used

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  • Gel water plugging agent and preparation method thereof
  • Gel water plugging agent and preparation method thereof
  • Gel water plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a gel blocking agent SPG1, wherein the gel blocking agent is prepared by the following manner:

[0048] Step 1: Take 100ml to simulate saline (add 16 g of NaCl, 7 g of CaCl per 100ml of deionized water. 2 And 1G MGCL 2 The formulation is obtained, the total mineralization is 24 × 10 4 Mg / L) was placed in a beaker, and 0.2 g of an antic acid stabilizer hard glucan was added to the simulated saline under magnetic stirrer stirring conditions (stirring velocity was 800-900 rpm), and stirring was stirred until an anti-acid stabilizer The hard integral is completely dissolved to give the first solution;

[0049] Step 2: Take a portion of the first solution and stirred at a magnetic stirrer under a magnetic stirrer stirring (stirring speed of 200-300 rpm) to slowly add 0.6 g of non-ionic polyacrylamide (the average molecular weight of 700000-800000 Daltons) The hydrolysis is 70-75%) and continues to be stirred for 1-1.5 h to obtain a diabal nonionic poly...

Embodiment 2

[0056] This embodiment provides a gel blocking agent SPG2, wherein the gel blocking agent is prepared by the following manner:

[0057] Step 1: Take 100 ml of formation water (water sample is provided by the Tahe Oilfield, the mineralization is 220-240g / L), in the beaker, under the stirring conditions of magnetic stirrer (the stirring speed is 800-900 rpm) 0.2 g of an antic acid stabilizer hard glucan was added to the analog salt water, and stirred at 0.5 h until the antic acid stabilizer hard glucan was completely dissolved, and the first solution was obtained;

[0058] Step 2: Take a portion of the first solution and stirred at a magnetic stirrer under a magnetic stirrer stirring (stirring speed of 200-300 rpm) to slowly add 0.6 g of non-ionic polyacrylamide (the average molecular weight of 700000-800000 Daltons) The hydrolysis is 70-75%) and continues to be stirred for 1-1.5 h to obtain a diabal nonionic polyacrylamide solution;

[0059] Step 3: Take another portion of the fi...

experiment example 1

[0065] This experimental example provides a series of gel blockage properties test, wherein the difference between these gel blocking agents is only: 0%, 0.02%, 0.04%, respectively, of the addition of metal cationic stabilizers. 0.06%, 0.08%, 0.1%. The method of preparation of the gel includes:

[0066] Step 1: Take 100ml to simulate saline (add 16 g of NaCl, 7 g of CaCl per 100ml of deionized water. 2 And 1G MGCL 2 The formulation is obtained, the total mineralization is 24 × 10 4 Mg / L) was placed in a beaker, and 0.2 g of an antic acid stabilizer hard glucan was added to the simulated saline under magnetic stirrer stirring conditions (stirring velocity was 800-900 rpm), and stirring was stirred until an anti-acid stabilizer The hard integral is completely dissolved to give the first solution;

[0067] Step 2: Take 50 mL of the first solution and stirred at a magnetic stirrer in a magnetic stirrer stirring (stirring speed is 200-300 rpm) to slowly add 0.6 g of non-ionic polyacr...

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Abstract

The invention provides a gel water plugging agent and a preparation method thereof. Based on the mass of raw materials of the gel water plugging agent, the gel water plugging agent is prepared from the following raw materials: 0.5 to 0.7 percent of anionic and nonionic polyacrylamide, 0.5 to 0.7 percent of anionic polyacrylamide, 0.9 to 1.1 percent of cross-linking agent A, 0.9 to 1.1 percent of cross-linking agent B, 0.1 to 0.3 percent of anti-acid stabilizer, 0.1 to 0.3 percent of metal cation stabilizer, 0.1 to 0.3 percent of inorganic salt nano stabilizer, and water. The cross-linking agent A is one or a combination of two or more of an aldehyde cross-linking agent and an aldehyde derivative cross-linking agent; the cross-linking agent B is one or a combination of two or more of a plurality of phenol cross-linking agents; and the metal cation stabilizer is a nickel cation stabilizer.

Description

Technical field [0001] The present invention is in the field of enhanced oil recovery wells chemical plugging technique, particularly to a high temperature and high salt suitable for oilfield vug reservoir ultra-deep self-healing includes a pre-crosslinked gel shutoff resistant to high temperature performance of the ultra-salt agents. Background technique [0002] Currently, the major domestic and international onshore oil fields have entered the period of high water cut, water shutoff profile as an important measure to improve the water flooding effect, the increased emphasis on enhanced oil recovery, oil has become a high water tapping the potential to increase reserves one of the core technology. [0003] For example, a typical oil temperature as high salt type vug reservoir, the reservoir depth of burial (5000-7000 meters), a temperature ranging from 130-160 deg.] C, a temperature of up to ultra deep portion 170 ℃, formation water salinity greater than 200,000 ppm, comprising...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/512C09K8/516
CPCC09K8/5083C09K8/512C09K8/516
Inventor 侯吉瑞屈鸣吴伟鹏李亚凯张炜吴文明
Owner CHINA UNIV OF PETROLEUM (BEIJING)