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Polyacrylamide nano microsphere profile control agent for oilfield chemical oil recovery

A polyacrylamide and chemical oil recovery technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low temperature resistance, poor salt resistance, etc., and achieve large particle size, good salt resistance, Small size effect

Active Publication Date: 2019-10-11
大庆紫源石油科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hydrolyzed polyacrylamide profile control and water shutoff agent widely used at home and abroad has the characteristics of low temperature resistance and poor salt resistance effect, so the existing polymer profile control agent can no longer meet the needs of later development and production of oilfields

Method used

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  • Polyacrylamide nano microsphere profile control agent for oilfield chemical oil recovery
  • Polyacrylamide nano microsphere profile control agent for oilfield chemical oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Polyacrylamide nano-microsphere profile control agent for chemical oil recovery in oil field, including the following raw materials in parts by weight: 15 parts of active auxiliary agent, 22 parts of reaction monomer, 43 parts of oil phase medium, 3 parts of crosslinking agent, 0.03 parts of initiator part, co-initiator 0.015 part, water 18 parts.

[0062] The reaction monomer is obtained by mixing acrylic acid, 2-acrylamide-2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide; the acrylic acid, 2-acrylamide- The molar ratio of sodium 2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide is 1:0.65:0.2.

[0063] The coagent is obtained by mixing sorbitan monooleate, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate, and ammonium substances. The sorbitan monooleate The weight ratio of acid ester, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate and ammonium substances is 1:0.6:0.8:0.35.

[0064] The r...

Embodiment 2

[0072] Polyacrylamide nano-microsphere profile control agent for chemical oil recovery in oil field, including the following raw materials in parts by weight: 14 parts of active auxiliary agent, 20 parts of reaction monomer, 40 parts of oil phase medium, 2 parts of crosslinking agent, 0.02 parts of initiator part, 0.01 part of co-initiator, and 15 parts of water.

[0073] The reaction monomer is obtained by mixing acrylic acid, 2-acrylamide-2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide; the acrylic acid, 2-acrylamide- The molar ratio of sodium 2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide is 1:0.65:0.2.

[0074] The coagent is obtained by mixing sorbitan monooleate, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate, and ammonium substances. The sorbitan monooleate The weight ratio of acid ester, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate and ammonium substances is 1:0.6:0.8:0.35.

[00...

Embodiment 3

[0083] Polyacrylamide nano-microsphere profile control agent for chemical oil recovery in oil field, including the following raw materials in parts by weight: 16 parts of active auxiliary agent, 23 parts of reaction monomer, 46 parts of oil phase medium, 5 parts of crosslinking agent, 0.04 parts of initiator part, co-initiator 0.02 part, water 20 parts.

[0084] The reaction monomer is obtained by mixing acrylic acid, 2-acrylamide-2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide; the acrylic acid, 2-acrylamide- The molar ratio of sodium 2-methylpropanesulfonate and 2-vinyl-1,1-cyclopropanedicarboxamide is 1:0.65:0.2.

[0085] The coagent is obtained by mixing sorbitan monooleate, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate, and ammonium substances. The sorbitan monooleate The weight ratio of acid ester, sorbitan monooleate polyoxyethylene ether, polyethylene glycol laurate and ammonium substances is 1:0.6:0.8:0.35.

[0086] The ra...

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Abstract

The invention discloses a polyacrylamide nano microsphere profile control agent for oilfield chemical oil recovery, and belongs to the field of oilfield chemistry. The polyacrylamide nano microsphereprofile control agent for oilfield chemical oil recovery is prepared from an active aid, reaction monomers, an oil phase medium, a cross-linking agent, an initiator, a co-initiator and water. The profile control agent is prepared by means of an inverse emulsion polymerization method and is controllable in particle size, good in salt tolerance, high in water absorption ratio, capable of quickly expanding at normal temperature, large in particle size after swelling, high in strength, prone to elastic deformation and uneasy to break; the microsphere polymer has the advantages of being small in size, good in dispersibility in water, capable of easily entering the deep part of the stratum and expanding at the temperature of an oil reservoir in the presence of water; in the process of deep profile control and water blocking, the microsphere polymer is transferred in a pore throat, blocks the pore throat, deforms to pass through the pore throat, then is transferred in another pore throat andblocks the pore throat until the microsphere polymer reaches the deep part of the stratum, preferential migration passages for water channeling are blocked step by step to achieve the blockage of thedeep part, and the oil recovery rate is further increased.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, in particular, the invention relates to a polyacrylamide nanometer microsphere profile control agent for oilfield chemical oil recovery. Background technique [0002] my country's reserves of petroleum resources are relatively abundant, among which, the development of low-permeability oilfields accounts for 1 / 3, mainly distributed in some major sedimentary basins in China. With the improvement of oil exploration, the proportion of low-permeability resources in newly-added proven reserves is constantly increasing. With the continuous development of low-permeability oilfields, the porosity and permeability of old oil well reservoirs further deteriorate, the water content is higher, the formation heterogeneity is higher, and the contradictions are more prominent. During the development process, measures such as fracturing and repeated fracturing create artificial fractures, coupled with the natura...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/58C08F222/38C08F2/32C09K8/512C09K8/88
CPCC08F2/32C08F220/06C09K8/512C09K8/887
Inventor 肖扬李明洋
Owner 大庆紫源石油科技开发有限公司
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