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Micro-emulsion completion fluid and application of the micro-emulsion completion fluid

A completion fluid and microemulsion technology, which is applied in the field of drilling auxiliary agents, can solve the problems of secondary damage and inability to effectively remove water lock damage, and achieve the effects of eliminating blockage damage, eliminating water lock damage, and ultra-low interfacial tension

Active Publication Date: 2015-06-24
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical removal of filter cake often causes secondary damage, even the mildest enzymatic treatment cannot effectively remove water lock damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Based on 100 parts by weight, take 40 parts of water, dissolve 2 parts of sodium chloride salt in water, take 40 parts of white oil, 3 parts of sodium dodecylbenzenesulfonate, 10 parts of n-butanol, and 3 parts of magnesium peroxide. Mix evenly in a beaker and stir at low speed for 5 minutes to form a microemulsion. After testing: the filter cake removal efficiency is 6.82, and the water lock release efficiency is 0.35.

Embodiment 2

[0026] Based on 100 parts by weight, take 30 parts of water, dissolve 2 parts of sodium chloride salt in water, take 30 parts of white oil, 14 parts of sodium lauryl sulfate, 20 parts of n-butanol, and 4 parts of magnesium peroxide, and put them in a beaker Mix evenly in medium and stir at low speed for 5 minutes to form a microemulsion. After testing: the filter cake removal efficiency is 6.35, and the water lock release efficiency is 0.26.

Embodiment 3

[0028] Based on 100 parts by weight, take 32 parts of water, dissolve 2 parts of sodium formate in water, take 50 parts of white oil, 3 parts of sodium dodecylbenzenesulfonate, 3 parts of Tween60, 6 parts of polyethylene glycol PEG600, magnesium peroxide 4 parts, put in a beaker and mix evenly, stir at low speed for 5 minutes to form a microemulsion. After testing: the filter cake removal efficiency is 7.53, and the water lock release efficiency is 0.28.

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PUM

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Abstract

The invention discloses a micro-emulsion completion fluid. The micro-emulsion completion fluid comprises the following components: an oil phase, a water phase, a surfactant, an auxiliary surfactant, a salt and a cleaning agent, wherein the cleaning agent is selected from an oxidant and a biological enzyme. The completion fluid provided by the invention has good comprehensive performance and facilitates cleaning of the formation damages caused by the drilling fluids, especially by the water-base drilling fluids; and the micro-emulsion completion fluid is capable of increasing crude oil yield when the well is put into operation. The completion fluid provided by the invention has wide application prospect.

Description

technical field [0001] The invention relates to the field of drilling aids, in particular to a completion fluid for oil fields. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with its multiple functions in the process of oil and gas drilling. Drilling fluid is the "blood" of drilling and plays a very important role in drilling operations. The main functions of drilling fluid are: ①carrying and suspending cuttings; ②stabilizing the well wall and balancing formation pressure; ③cooling and lubricating drill bits and drilling tools; ④transmitting hydraulic power. During the drilling process, the drilling fluid must form a dense inner and outer filter cake to effectively prevent the solid and liquid phases from invading the reservoir, and the formed filter cake can be released through perforation. However, for non-perforated completions, the filter cake cannot be penetrated by perforation, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/524
CPCC09K8/524C09K8/58
Inventor 张敬辉李公让乔军于雷蓝强李海斌武学芹张虹王莉萍
Owner CHINA PETROCHEMICAL CORP
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