Compound plug removal agent for tight sandstone oil reservoir

A technology of composite plugging remover and tight sandstone, which is applied in the field of composite plugging remover and oil well plugging remover, can solve the problems of secondary pollution of reservoirs, small mass fraction, and increase the effective permeability of reservoirs, etc., to achieve Improve single well production, improve pertinence and scientificity, and increase effective permeability

Active Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mass fraction of organic acids and inorganic acids is relatively small. Although it can achieve the effect of unblocking the near-wellbore area, it is not clear whether the effective permeability of the reservoir can be further increased after unblocking.
However, for the plugging removal me

Method used

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  • Compound plug removal agent for tight sandstone oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, the composite plugging agent used in tight sandstone reservoirs is composed of pre-fluid, main fluid and post-fluid according to the volume of 40m 3 、159m 3 and 40m 3 Composition; the pre-fluid is composed of the following components in mass percentage: 8% hydrochloric acid, 0.8% potassium chloride, 0.6% ethylenediaminetetraacetic acid, 0.7% water-blocking agent SL-F, and 1.2% corrosion inhibitor BS-X , 0.4% ethylene glycol butyl ether, the balance is water; the main body liquid is composed of the following components in mass percentage: 7% fluorosilicic acid, 10% hydrochloric acid, 0.8% potassium chloride, 0.4% ethylenediaminetetraacetic acid, water lock Agent SL-F 0.9%, corrosion inhibitor BS-X 0.8%, ethylene glycol butyl ether 0.6%, the balance is water; the post liquid is composed of the following components in mass percentage: hydrochloric acid 12%, potassium chloride 1.2%, 0.4% ethylenediaminetetraacetic acid, SL-F 0.9% hydrolytic agent, 0.8% co...

Embodiment 2

[0024] In this example, the composite plugging agent used in tight sandstone reservoirs is composed of pre-fluid, main fluid and post-fluid according to the volume of 45m 3 、155m 3 and 45m 3 Composition; the pre-fluid and the post-fluid are composed of the following components in mass percentages: 10% hydrochloric acid, 1% potassium chloride, 0.5% ethylenediaminetetraacetic acid, 0.8% hydrolytic lock agent SL-F, corrosion inhibitor BS -X1%, 0.5% ethylene glycol butyl ether, the balance is water; the main body liquid is composed of the following components in mass percentage: 6% fluorosilicic acid, 12% hydrochloric acid, 1% potassium chloride, 0.5 ethylenediaminetetraacetic acid %, water-blocking agent SL-F0.8%, corrosion inhibitor BS-X1%, butyl glycol ether 0.5%, and the balance is water. The preparation method of each treatment solution is the same, that is, mixing each component and then stirring evenly.

[0025] How to use: For HH12P130 oil well, use 0.25m 3 / min, 0.7m ...

Embodiment 3

[0027] In this example, the composite plugging agent used in tight sandstone reservoirs is composed of pre-fluid, main fluid and post-fluid according to the volume of 50m 3 、160m 3 and 50m 3 Composition; the pre-fluid is composed of the following components in mass percentage: 12% hydrochloric acid, 1.2% potassium chloride, 0.4% ethylenediaminetetraacetic acid, 0.9% water-blocking agent SL-F, and 0.8% corrosion inhibitor BS-X , 0.6% ethylene glycol butyl ether, the balance is water; the main body liquid is composed of the following components in mass percentages: 5% fluosilicic acid, 14% hydrochloric acid, 1.2% potassium chloride, 0.6% ethylenediaminetetraacetic acid, water lock Agent SL-F0.7%, corrosion inhibitor BS-X1.2%, ethylene glycol butyl ether 0.4%, and the balance is water; the post liquid is composed of the following components in mass percentage: hydrochloric acid 8%, potassium chloride 0.8%, 0.6% ethylenediaminetetraacetic acid, 0.7% hydrolytic lock agent SL-F, 1...

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Abstract

The invention discloses a compound plug removal agent for a tight sandstone oil reservoir, and belongs to the technical field of oilfield exploitation. The compound plug removal agent is composed of prepad fluid, main body fluid and post-pad fluid, wherein the prepad fluid and the post-pad fluid each contains hydrochloric acid, potassium chloride, ethylenediaminetetraacetic acid, water plug removal agents, corrosion inhibitor and ethylene glycol butyl ether, and the main body fluid contains fluosilicic acid, hydrochloric acid, potassium chloride, ethylenediaminetetraacetic acid, water plug removal agents, corrosion inhibitor and ethylene glycol butyl ether. According to pollution plugging which possibly occurs in the development process of the tight sandstone oil reservoir, corresponding treatment fluid in the compound plug removal agent is sequentially infused into the reservoir according to the three stages of front, middle and rear, and the purposes of removing reservoir plugging, increasing effective permeability of the reservoir, improving the plug removal effect and recovering per-well production can be achieved. The hydrochloric acid is matched with the fluosilicic acid to serve as the components of the main body fluid, plug removal is achieved, and meanwhile the reservoir is protected against secondary pollution.

Description

technical field [0001] The invention relates to an oil well plug-removing agent, in particular to a composite plug-removing agent for tight sandstone reservoirs, and belongs to the technical field of oil field exploitation. Background technique [0002] During the process of oil well drilling and completion to production, the contact of foreign fluid with reservoir rock and reservoir fluid may cause the clogging of the seepage channel of the reservoir. During the production process of old wells, changes in formation temperature, pressure and fluid properties may also cause blockage of reservoir seepage channels, reducing permeability. For the above situation, plugging removal by injecting plugging removal agent into the formation is an effective measure to restore and increase reservoir permeability. However, for tight sandstone reservoirs, due to their low porosity and permeability, and the long contact time between the reservoir and the drilling fluid during horizontal we...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 董光唐万举李嘉瑞陈付虎张永春何青王迁伟刘威姚昌宇
Owner CHINA PETROLEUM & CHEM CORP
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