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Gel breaking liquid based modifying and flooding agent and preparation method thereof

A technology of regulating and displacing agents and gel breaking, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of ineffective reduction of surface crude oil interfacial tension and complicated process, so as to improve utilization rate and use value, material Easy to get, the effect of improving recovery

Active Publication Date: 2015-04-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application number is CN200910159223.1, the publication number is 101629486A, and the patent application with the publication date of 2010.01.20 proposes a clean fracturing flowback fluid recovery oil flooding and plugging removal process, which discloses breaking the clean fracturing flowback fluid Add flocculant or slime stripping agent or bactericide after glue to deposit and sterilize suspended matter, and then add or compound chemical agents to make oil displacement agent after filtration and fine filtration, but this oil displacement agent cannot effectively reduce the contact with the ground Interfacial Tension of Crude Oil
Moreover, this method needs to add flocculants, slime stripping agents, fungicides and biological enzyme preparations, and the flowback liquid needs to be filtered through precision filters, so the process is relatively complicated

Method used

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  • Gel breaking liquid based modifying and flooding agent and preparation method thereof
  • Gel breaking liquid based modifying and flooding agent and preparation method thereof
  • Gel breaking liquid based modifying and flooding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the gel-breaking fluid-based control and flooding agent includes 0.1%-0.4% gel-breaking fluid and 0.004%-0.01% co-surfactant, and the rest is oilfield injection water.

[0021] The co-surfactant in the flood control agent has a synergistic effect with the thickened water cleaning fracturing fluid gel breaker, and has a low surface tension, which can reduce the interfacial tension between oil and water, greatly improve the oil washing efficiency, and increase the oil recovery rate.

Embodiment 2

[0022] Example 2, the gel-breaking fluid-based regulating and displacing agent, the main components include: 0.25% gel-breaking fluid, 0.006% co-surfactant, the rest is on-site injection water, co-surfactant is dodecylbenzenesulfonic acid sodium.

[0023] The co-surfactant can also be a kind of nonylphenol polyoxyethylene ether.

[0024] The co-surfactant can also be a combination of sodium dodecylbenzenesulfonate and sodium dodecylsulfate at a ratio of 1:1.

[0025] The co-surfactant can also be sodium lauryl sulfate and sodium lauryl sulfate, a combination of the two in a ratio of 1:1.

[0026] The co-surfactant of the flood control agent in this embodiment can produce a strong synergistic effect with the viscous water cleaning fracturing fluid gel-breaking fluid, and has good emulsification performance, temperature resistance and salt resistance performance. The co-surfactant is one or more of sodium dodecylbenzenesulfonate, sodium dodecylsulfate, sodium dodecylsulfonate ...

Embodiment 3

[0027] Example 3, the gel-breaking liquid-based regulating and displacing agent, the main components include: 0.1% gel-breaking liquid, 0.004% co-surfactant, the rest is injected water on site, and the co-surfactant is nonylphenol polyoxyethylene ether .

[0028] The co-surfactant can also be a combination of sodium dodecylbenzenesulfonate and sodium dodecylsulfate at a ratio of 1:1.

[0029] The co-surfactant can also be a combination of sodium lauryl sulfate and sodium lauryl sulfate in a ratio of 1:1.

[0030] The co-surfactant of the flooding agent in this example has a strong synergistic effect with the gel breaking fluid, which can effectively reduce the interfacial tension of oil and water, and has good emulsifying performance, temperature and salt resistance.

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Abstract

The invention discloses a gel breaking liquid based modifying and flooding agent, which mainly comprises the following raw materials in percentage by weight: 0.1-0.4% of thickened water / clean fracturing fluid / gel breaking liquid, 0.004%-0.01% of a co-surfactant, and the balance of oilfield injected water. The preparation method of the modifying and flooding agent comprises the following steps: preparing thickened water / clean fracturing fluid / gel breaking liquid, and adding a co-surfactant and oilfield injected water into the gel breaking liquid, so that the modifying and flooding agent is obtained. The prepared modifying and flooding agent can be directly injected into a water injection well, and then enters an oil well through the water injection well, so that the oil-water interfacial tension can be effectively reduced; an oleophyllic rock surface is converted into a weak hydrophilic surface, so that the capillary force is reduced; and remaining oil is activated, so that the oil recovery is greatly enhanced.

Description

technical field [0001] The invention relates to a gel-breaking fluid-based regulating and displacing agent; the invention also relates to a preparation method of the regulating and displacing agent. Background technique [0002] As a key technology for the efficient development of low-permeability oil and gas fields, fracturing technology has been popularized and applied in Changqing Oilfield and many domestic oilfields, meeting the needs of oil and gas fields for production enhancement and transformation. In recent years, clean fracturing fluid has been widely used due to its advantages of low friction and low damage, but it also produces a large amount of flowback fluid. Based on the requirements of environmental protection and economy, how to rationally and effectively utilize and treat the flowback liquid has become an urgent problem to be solved. [0003] The application number is CN200910159223.1, the publication number is 101629486A, and the patent application with t...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/58C09K8/508C09K8/506
CPCC09K8/506C09K8/5083C09K8/58C09K8/584C09K2208/26C09K2208/30
Inventor 李勇王所良王玉功尹虎琛汪小宇唐冬珠武龙周然杨发金娜陈迎花武月荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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