Gel injection type profile control agent

A profile control agent and gel-type technology, which is applied in the field of injection gel-type profile control agent, can solve the problems of small profile control radius, influence on profile control effect, and short validity period of profile control, so as to expand the swept volume and improve recovery rate effect

Active Publication Date: 2014-03-26
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high initial viscosity of the profile control agent currently used, the profile control agent enters the non-profile control layer, and then pollutes the non-plugging part. Because the profile control agent enters the non-pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The content of acrylamide is 3.5g / L, then add 0.008g / L of potassium persulfate, 0.015g / L of N,N-methylenebisacrylamide, 40mg / L of 1,1-diphenyl-2 - Trinitrophenylhydrazine and 0.6g / L Tris-HCl buffer solution to obtain the injected gel type profile control agent. The solution was sampled and tested. The viscosity of the profile control agent solution was 200.3mPa.s at 24h, 2134mPa.s after 48h, and 3256mPa.s at 10d. The profile control agent gelled obviously and had good stability .

Embodiment 2

[0015] The content of acrylamide is 5g / L, then add 0.02g / L potassium persulfate, 0.03g / L N, N-methylenebisacrylamide, 20mg / L sodium hypophosphite and 0.5g / L Tris-HCl buffer solution to obtain the injected gel-type profile control agent. The solution was sampled and tested. The viscosity of the profile control agent solution was 350.6mPa.s at 24h, 3689mPa.s after 48h, and 3876mPa.s at 10d. The profile control agent gelled obviously and had good stability .

Embodiment 3

[0017] The content of acrylamide is 4g / L, then add 0.01g / L of sodium persulfate, 0.02g / L of N-methylolacrylamide, 0.5g / L of Tris-HCl buffer to obtain the injection gel type Profile control agent. The solution was sampled and tested. The viscosity of the profile control agent solution was 1600.6mPa.s at 24h, 2420mPa.s after 48h, and 3476mPa.s at 10d. The profile control agent gelled obviously and had good stability .

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PUM

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Abstract

The present invention provides a gel injection type profile control agent, which comprises: acrylamide, an initiator, a cross-linking agent, a retarder and a buffer agent, wherein the acrylamide concentration is 3.5-5 g/L, the initiator concentration is 0.008-0.02 g/L, the cross-linking agent concentration is 0.015-0.03 g/L, the retarder concentration is 0-40 mg/L, and the buffer agent concentration is 0-0.6 g/L. The gel injection type profile control agent has the ultra low initial viscosity, and can form the continuous gel with the adjustable cross-linking viscosity in the target stratum according to the design scheme under different stratum permeabilities, different stratum temperatures, different mineralization degrees, and different well completion manners, such that purposes of sweeping volume expansion and recovery efficiency increase can be achieved through adjusting the water absorption profile of the water well.

Description

technical field [0001] The invention belongs to the field of profile control agents for oil fields, in particular to an injection gel type profile control agent. Background technique [0002] In oilfield water flooding, after decades of water injection development, medium and high permeability layers appeared in some parts of the oil layer, resulting in a large amount of injected water ineffective circulation, reduced recovery, and poor water injection effect. Profile control is to inject the profile control agent into the high-permeability layer in the oil layer to reduce the water absorption capacity of the high-permeability layer, so that the water can be injected into the profile in a balanced manner. Due to the high initial viscosity of the profile control agent currently used, the profile control agent enters the non-profile control layer, and then pollutes the non-plugging part. Because the profile control agent enters the non-profile control layer in large quantities...

Claims

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Application Information

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IPC IPC(8): C09K8/512C08F220/56C08F222/38C08F220/58
CPCC08F220/56C09K8/512C08F222/385C08F220/58
Inventor 胡玉国梁海臣李靖张冠洲张有强肖劲松赵兴君
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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