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Temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel

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

Active Publication Date: 2015-03-25
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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  • Temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel
  • Temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel
  • Temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel

Examples

Experimental program
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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 the crosslinking agent (formaldehyde) is 1.5%, the concentration of the initiator (ammonium persulfate) varies from 0 to 0.6%, and the rest is 20×10 4 mg / L NaCl saline. See Table 2 for the gelling conditions. The gelling time is between 4 and 23 hours, the final setting strength is grade I, and no syneresis occurs in 90 days.

[0038] Table 2 gelling situation of water blocking gel embodiment 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%, wherein the mass ratio of A and B is 3: 1. The concentration of the crosslinking agent (phenolic resin) is 1%, the concentration of the initiator (ammonium persulfate) varies from 0 to 0.6%, and the rest is 20×10 4 mg / L NaCl saline. See Table 3 for the gelling conditions. The gelling time is between 23 and 28 hours, the final setting strength is grade I, and no syneresis occurs in 90 days.

[0042] Table 3 gelation situation of water blocking gel embodiment 2

[0043]

Embodiment 3

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

[0046] Table 4 Hydroplugging Gel Example 3 Gel-forming Situation

[0047]

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Abstract

The invention discloses temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel which mainly consists of, by mass, main agent 4%-6%, cross-linking agent 1%-2% and the balance saline water. The main agent consists of a monomer A and a monomer B, wherein the monomer A is acrylamide, and the monomer B is ester matter. The cross-linking agent is one of or a mixture of two or more formaldehyde, phenolic resin, resorcinol, hexamethylene tetramine, paraformaldehyde and polyethyleneimine. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel spontaneously produces cross-linking polymerization under the condition of high temperature, an initiator is not added, the gelling time can be controlled to be 2 hours to 28 hours at the temperature of 120 DEG C, the water plugging gel can be directly prepared by high-salinity water, the gelling strength can be up to the visual inspection code level I, and synaeresis does not occur after 90 days. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel is low in initial viscosity, has the advantages of being few in components, good in instant solubility and pumping injection performance, high plugging strength, good in thermohaline stability, low in cost and the like and has wide application prospect on the aspect of high-temperature high-salinity oil reservoir profile control water plugging.

Description

technical field [0001] The invention relates to a temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerized water-plugging gel that can be used for water plugging in oil wells in high-temperature and high-salt reservoirs, profile control of water injection wells, and improvement of water injection pressure, and belongs to the oil field in the tertiary oil recovery technology chemical field. Background technique [0002] Using chemical profile control and water shutoff technology to carry out profile control of water injection wells or water shutoff of oil wells can achieve the goals of "controlling water and stabilizing oil" and "controlling water and increasing oil production" to a certain extent. The in-situ polymerization bulk gel formed by acrylamide and temperature-resistant and salt-resistant functional monomers plus cross-linking agents and other additives has been widely used in chemical profile control and water shutoff technology...

Claims

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Application Information

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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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