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Intercalation delay in-situ polymerization water shutoff gel for high-temperature oil reservoir

A technology of intercalation compounding and high-temperature oil, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor long-term thermal stability and short gelation time, and achieve good long-term stability and liquid preparation The effect of convenience and simple construction process

Inactive Publication Date: 2016-03-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water plugging gel can overcome the problems of too short gelation time and poor long-term thermal stability of existing water plugging gels, and is suitable for water plugging operations in various types of high-temperature reservoirs

Method used

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  • Intercalation delay in-situ polymerization water shutoff gel for high-temperature oil reservoir
  • Intercalation delay in-situ polymerization water shutoff gel for high-temperature oil reservoir
  • Intercalation delay in-situ polymerization water shutoff gel for high-temperature oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The total mass concentration of organic monomer acrylamide is 8%, the concentration of crosslinking agent (formaldehyde) is 2%, the main agent of intercalation (modified montmorillonite) is 6%, the concentration of gelation regulator (ethanol) is 0.8%, The concentration of the initiator (2,2'-azobis(2-methylpropionamidine) dihydrochloride) varies from 0.06% to 0.1%, and the rest is water. See Table 2 for the gelling conditions. The gelling time is between 4 and 10 hours, the final setting strength is grade I, and no syneresis occurs in 90 days.

[0039] Table 2 embodiment 1 gelation situation

[0040] Initiator concentration (%)

[0041] 0.06

Embodiment 2

[0043] The total mass concentration of organic monomer acrylamide is 6%, the concentration of crosslinking agent (active phenolic resin) is 1%, the main agent of intercalation (kaolin) is 8%, the concentration of gelation regulator (methanol) is 1.5%, and the initiator (Ammonium persulfate) concentration ranges from 0.06% to 0.1%, and the rest is water. See Table 3 for the gelling conditions. The gelling time is between 16 and 24 hours, the final setting strength is grade I, and no syneresis occurs in 90 days.

[0044] Table 3 embodiment 2 gelation situation

[0045] Initiator concentration (%)

Embodiment 3

[0047] The total mass concentration of organic monomer acrylamide is 6%, the concentration of crosslinking agent (polyethyleneimine) is 1%, the main agent of intercalation (montmorillonite) is 8%, and the gelation regulator (methanol+ethylene glycol, The mass ratio (1:2) concentration is 2%, the initiator (ammonium persulfate) concentration ranges from 0.06% to 0.1%, and the rest is water. See Table 4 for the gelling conditions. The gelling time is between 20 and 30 hours, the final setting strength is grade I, and no syneresis occurs in 90 days.

[0048] Table 4 embodiment 3 gelation situation

[0049] Initiator concentration (%)

[0050] 0.1

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Abstract

The invention belongs to the field of oilfield chemistry related to the enhanced oil recovery technique, and particularly relates to intercalation delay in-situ polymerization water shutoff gel for a high-temperature oil reservoir. The intercalation delay in-situ polymerization water shutoff gel is prepared from, by mass, 6-8% of host agent, 1-2% of cross-linking agent, 2-8% of intercalation host agent, 0.06-0.1% of initiator, 0.01-2% of gelling regulating agent, and the balance water. The intercalation delay in-situ polymerization water shutoff gel has the advantages that the fast dissolving property of components in the gel system is good, and liquid dosing is convenient; the construction technology is simple, pumpability is high, and injectivity is high; gelling time can be controlled to be 4-30 h at 130 DEG C; long-term stability is high at high temperatures, and synaeresis and strength reduction does not occur on the gel within three months; influence on gelling performance is small, leak-off prevention can be well achieved, and the gel can be used for water shutoff of fractured reservoirs.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry in the technology of enhancing oil recovery, and in particular relates to an intercalation composite delayed in-situ polymerization water plugging gel for high-temperature oil reservoirs. Background technique [0002] The chemical profile control and water shutoff technology is a relatively mature technology in oilfields for "controlling water to stabilize oil production" and "controlling water to increase oil production", which can effectively improve the sweep coefficient of injected water and achieve the purpose of improving oil recovery. Among chemical profile control water shutoff agents, gel water shutoff agents have the advantages of strong plugging ability and selective water shutoff, and are widely used in profile control and water shutoff operations. However, under the condition of high reservoir temperature, conventional gel plugging agents cannot meet the technical requirements of pro...

Claims

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Application Information

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IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 蒲万芬王雷孙琳杨洋
Owner SOUTHWEST PETROLEUM UNIV
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