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A temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerization water blocking gel

A temperature-resistant, salt-resistant, hydrogel technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of poor thermal salt stability, less profitable on-site operation, etc., and achieve low initial viscosity and pumpability Good, high gel strength effect

Active Publication Date: 2017-10-10
成都西南石大石油工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a heat-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerized water-blocking gel, which can spontaneously cross-link and polymerize at a high temperature of 120°C and above, without the need for an initiator, and has fewer components to facilitate On-site operation; the gelling time can be controlled within 2-28 hours, the final setting strength is high, and the hot-salt stability is good, which can overcome the problems of too fast gelation and poor hot-salt stability of the existing water blocking gel under high temperature conditions; A relatively long pumping time can be obtained under certain conditions, which can significantly increase the injection volume in high-temperature reservoirs, and can be used for profile control and water shutoff operations in various types of high-temperature reservoirs

Method used

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  • A temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerization water blocking gel
  • A temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerization water blocking gel
  • A temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerization water blocking gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The total mass concentration of monomer A (acrylamide) and monomer B (hydroxyethyl methacrylate + hydroxypropyl methacrylate, the mass ratio is 1:1) is 6%, and the mass ratio of A and B is 4: 1. The concentration of crosslinking agent (formaldehyde) is 1.5%, the concentration of initiator (ammonium persulfate) varies from 0 to 0.6%, and the rest is 20×10 4 mg / L NaCl brine. The gel formation is shown in Table 2. The gel formation time is between 4 and 23 hours, the final setting strength is Class I, and no syneresis occurs in 90 days.

[0038] Table 2 Gelation of the hydrogel in Example 1

[0039]

Embodiment 2

[0041] The total mass concentration of monomer A (acrylamide) and monomer B (hydroxyethyl methacrylate + hydroxypropyl methacrylate, mass ratio is 1:1) is 4%, and the mass ratio of A and B is 3: 1. The concentration of crosslinking agent (phenolic resin) is 1%, the concentration of initiator (ammonium persulfate) varies from 0 to 0.6%, and the rest is 20×10 4 mg / L NaCl brine. The gel formation is shown in Table 3. The gel formation time is between 23 and 28 hours, the final setting strength is Class I, and no syneresis occurs in 90 days.

[0042] Table 3 Gelling situation of Example 2 of plugging hydrogel

[0043]

Embodiment 3

[0045] The total mass concentration of monomer A (acrylamide) and monomer B (isooctyl methacrylate + hydroxypropyl methacrylate, the mass ratio is 1:5) is 6%, and the mass ratio of A and B is 4: 1. The concentration of crosslinking agent (formaldehyde) is 1.5%, the concentration of initiator (2,2'-azobis(2-methylpropionamidine) dihydrochloride) varies from 0 to 0.6%, and the rest is 20× 10 4 mg / L NaCl brine. The gel formation is shown in Table 4. The gel formation time is between 5 and 23 hours, the final setting strength is Class I, and no syneresis occurs in 90 days.

[0046] Table 4 Gelation of the hydrogel in Example 3

[0047]

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Abstract

The invention discloses a temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerized water blocking gel, which mainly consists of a main agent, a crosslinking agent and brine, and its mass percentage is: 4-6% of the main agent, 1% of the crosslinking agent ~2%, the rest is brine; the main agent is composed of monomer A and monomer B, monomer A is acrylamide, and monomer B is an ester; the crosslinking agent is formaldehyde, phenolic resin, resorcinol, six Methylenetetramine, paraformaldehyde, polyethyleneimine, one, two or a mixture of two or more. The present invention can spontaneously cross-link and polymerize under high temperature conditions without adding an initiator, and the gelation time at 120°C can be controlled within 2 to 28 hours. It can be directly prepared with high-salinity water, and the gel strength can reach the visual code I level. Syneresis did not occur for 90 days. The invention has the advantages of low initial viscosity, few components, good instant solubility, good pumping performance, high plugging strength, good hot-salt stability, and low cost, and has broad application in profile control and water plugging of high-temperature and high-salt reservoirs. Application prospect.

Description

Technical field [0001] The invention relates to a temperature-resistant, salt-resistant and high-temperature self-crosslinking in-situ polymerized hydrogel for plugging water in oil wells of high-temperature and high-salt oil reservoirs, and for near-well profile control of water injection wells to increase water injection pressure, and belongs to oil fields in tertiary oil recovery technology. Chemistry field. Background technique [0002] The use of chemical profile control and water shutoff technology to perform profile control of water injection wells or water shutoff of oil wells can achieve the purpose of "controlling water and stabilizing oil" and "controlling water and increasing oil" to a certain extent. The in-situ polymerized bulk gel formed by acrylamide, temperature-resistant and salt-resistant functional monomers, crosslinking agents, and other additives has been widely used in chemical profile control and water shutoff technology. [0003] For high-temperature and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C08F220/56C08F220/28C08F220/18C08F222/14
CPCC09K8/512C08F220/56C08F222/102C08F220/281C08F220/1808
Inventor 贾虎任强蒲万芬李勇明
Owner 成都西南石大石油工程技术有限公司
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