Gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs

A technology of hydrogel and high-temperature oil, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of too fast gel formation, poor thermal stability, etc., and achieve convenient liquid dispensing, good thermal stability, and sealing High blocking strength effect

Inactive Publication Date: 2012-03-21
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide an in-situ polymerized water blocking gel for delaying gelation in high-temperature oil reservoirs. The gelation time of the water blocking gel at a high temperature of 120°C can be controlled within 20-72 hours, and the final gelation strength is high. Good thermal stability, which can overcome the problems of the existing water plugging gels that gel too quickly or have poor thermal stability at high temperatures, and can obtain a relatively long pumping time at high temperatures, which can significantly improve the injection rate in high-temperature reservoir construction It can be widely used in various types of high temperature oil reservoir water shutoff operations

Method used

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  • Gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs
  • Gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs
  • Gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The total mass concentration of monomer A (acrylamide) and monomer B (butyl acetate) is 6%, wherein the mass ratio of A and B is 3:1, the concentration of crosslinking agent (phenolic resin) is 1%, and the solubilizer ( Methanol) concentration is 1.5%, initiator (ammonium persulfate) concentration variation range is 0.4~0.8%, and the rest is water. See Table 2 for the gelling conditions. The gelling time is between 30 and 40 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] Initiator(%)

Embodiment 2

[0041] The total mass concentration of monomer A (acrylamide) and monomer B (allyl acetate + butyl acrylate, mass ratio: 1:1) is 6%, where the mass ratio of A and B is 4:1, and the crosslinking agent (Formaldehyde) concentration is 1%, solubilizer (ethanol+glycerol, mass ratio: 1:1) concentration is 1.5%, initiator (azobisisobutyronitrile (AIBN)) concentration variation range is 0.2~0.8% , and the rest is water. See Table 3 for the gelling conditions. The gelling time is between 40 and 72 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 mass concentration of the monomer is 6%, and the mass ratio of A (acrylamide) and B (ethyl methacrylate + allyl heptanoate + allyl phenoxyacetate, mass ratio: 1:1:1) is 4 : 1, solubilizer (isopropanol+n-butanol+tert-amyl alcohol, mass ratio: 1:1:1) concentration is 1.5%, initiator (potassium persulfate and tertiary amine monomer N, N-dimethyl The concentration of ethyl methacrylate) is 0.1%, the concentration range of the crosslinking agent (hexamethylenetetramine) is 1-2%, and the rest is water. See Table 4 for the gelling conditions. The gelling time is about 40 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 relates to a gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs, which consists of 5 to 7 percent by weight of main agent, 1 to 2 percent by weight of solubilizer, 1 to 2 percent by weight of cross-linking agent, 0.1 to 0.8 percent by weight of initiator and the balance of water, the main agent consists of monomer A and monomer B, the mass ratio of the monomer A to the monomer B is 3:1 to 5:1, the monomer A is acrylamide, and the monomer B is ester. Under high temperature, the pumping time of the gel is relatively longer, the gelation time canbe controlled at 20 to 72 hours under 120 DEG C, the final set strength can reach visual observation code level I, the synaeresis of the gel does not take place in 90 days, and the gel can be used inwater shutoff operation for high-temperature reservoirs under 90 DEG C to 140 DEG C. Because the gel has the advantages of good pumping property, high plugging strength, long service life, simple construction process and the like, the gel has a broad application prospect in chemical profile modification and water shutoff for oil fields.

Description

technical field [0001] The invention relates to a water shutoff gel used for water shutoff of oil wells in high-temperature oil reservoirs and profile control of water injection wells to improve water injection pressure, and belongs to the field of oil field chemistry in tertiary oil recovery technology. Background technique [0002] Through water plugging of oil wells or profile control of water injection wells, "water control and oil increase" can be realized to a certain extent. Chemical profile control and water shutoff technology is an effective measure, which has been widely used in many oilfields at home and abroad, and has also brought good economic benefits. The polymer body gel formed by polyacrylamide or acrylamide copolymer plus cross-linking agent and other additives has been widely used in chemical profile control and water shutoff technology. [0003] For high-temperature oil reservoirs (>90°C), higher requirements are placed on the performance of polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F218/12C08F220/18C09K8/42
Inventor 蒲万芬贾虎孙琳
Owner SOUTHWEST PETROLEUM UNIV
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