Liquid sustained-release acid breaker

A slow-release acid gel breaker and liquid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of oil well scrapping, large impact on construction effect, poor operability, etc., and achieve small impact on colloid performance, Improvement of construction operability and effectiveness, slow release effect

Inactive Publication Date: 2009-08-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a liquid slow-release acid breaker to overcome the problems of the existing breakers, such as poor operability, great influence on the construction effect, and serious oil well scrapping.

Method used

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  • Liquid sustained-release acid breaker
  • Liquid sustained-release acid breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1, a liquid slow-release acid breaker, is prepared by putting 100 g of dimethyl malonate and 400 g of petroleum ether into a 1000 mL flask at room temperature and stirring evenly. This product is added to 50 kg of water-based jelly fracturing fluid, stirred evenly, and pumped downhole together with the fracturing fluid.

[0013] Hydrolysis of ethyl formate, its chemical formula:

[0014] CHOOC 2 h 5 O+H 2 O→HCOOH+C 2 h 5 Oh

Embodiment 2

[0015] Embodiment 2, a kind of liquid sustained-release acid breaker, is at normal temperature, puts 100g of diethyl oxalate, 300g of butyl acetate into the flask of 1000mL and stirs uniformly to make. This product is added to 10 kg of water-based jelly fracturing fluid, stirred evenly, and pumped downhole together with the fracturing fluid.

[0016] Hydrolysis of diethyl oxalate, its chemical formula:

[0017]

Embodiment 3

[0018] Embodiment 3, a kind of liquid sustained-release acid breaker, is at normal temperature, puts 100g of ethyl formate, 500g of butyl acetate into the flask of 1000mL and stirs uniformly to make. This product is added to 30 kg of water-based jelly fracturing fluid, stirred evenly, and pumped downhole together with the fracturing fluid.

[0019] Dimethyl malonate is hydrolyzed, and its chemical formula is:

[0020]

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PUM

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Abstract

The invention belongs to the field of a preparation process of oilfield chemicals and relates to an oilfield gel breaking technique, in particular to a liquid slowly-releasing acid gel breaker which aims at overcoming the problems that the operability is bad, the influence to the contracture effect is larger and the oil well can disable seriously in the prior art. In order to solve the problems of the prior art, the invention provides the technical schemes that the liquid slowly-releasing acid gel breaker contains ester acid-supply components and organic solvent protective solute components according to the mass ratio of 1 to 1-7, wherein the ester is a single component or the combination of a plurality of components of methyl formate, ethyl formate, diethy-aceto oxalate, dimethyl malonate and/or ethyl malonate; and the organic solvent is alkane or liquid ester. As the product of the invention can be released slowly, the construction operability and the effectiveness can be greatly improved; after the fracturing operation is finished, the product can be finally released completely, the viscosity of the gel breaking product is low, and the aims of completely breaking gel and flowing back in time can be achieved.

Description

technical field [0001] The invention belongs to the field of oilfield chemical preparation technology, in particular to an oilfield gel breaking technology, in particular to a liquid slow-release acid gel breaker. Background technique [0002] In the middle and late stages of oilfield development, hydraulic fracturing of subsurface formations is a known method of increasing the permeability of subsurface formations while recovering petroleum product substances, and is one of the most effective production stimulation measures. Due to the low porosity and permeability of the rock formation, it cannot be put into production without fracturing. In this method, a viscous liquid fracturing fluid is poured into the wellbore and pressure is applied to cause the fracture. The proppant in the fluid keeps the fracture open . Gel breaker is one of the essential substances in fracturing construction. Before the fracturing gel is formed, the gel breaker and fracturing fluid are pumped do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60
Inventor 杨晓武沈一丁李培枝李刚辉
Owner SHAANXI UNIV OF SCI & TECH
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