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Composite acidizing and fracturing liquid and preparation method thereof

A kind of acid fracturing and composite technology, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problems of small formation voids, decreased fracturing and acidizing effect, milk plugging, etc.

Inactive Publication Date: 2014-04-02
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional fracturing and acidizing technology does not work on most oil layers, the main reason is that the fracturing fluid flowback is not complete, which reduces the effect of fracturing and acidizing and leads to secondary pollution
In addition, due to the small formation voids, low permeability, and poor fluidity, the squeezed fracturing fluid easily invades the oil layer, resulting in milk plugging, wax plugging, and clay swelling plugging, etc.
[0003] At present, the commonly used guar gum or hydroxypropyl guar gum fracturing fluids are mostly water-based fracturing fluids, which are suitable for offshore or desert oilfields where fresh water resources are scarce or high-pressure wells require high-salinity and high-density fracturing fluids. This fracturing fluid system is prone to shrinkage in seawater with high ionic strength, which reduces the viscosity of the fracturing fluid, thereby reducing the sand-carrying capacity of the fracturing fluid and reducing the use effect of the fracturing fluid. crack construction needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First prepare the thickened acid solution: mix the polyacrylamide solution with a mass fraction of 0.8% and the konjac glucomannan solution with a mass ratio of 1:1 and add it to hydrochloric acid with a concentration of 12%. The synergistic thickening effect of mannan increases the viscosity of thickened acid.

[0023] Next, a water-based fracturing fluid base fluid was prepared by mixing carboxymethyl cellulose with a mass fraction of 15%, 10% chromium sulfate, and 3% polyacrylamide to form a water-based fracturing fluid base fluid.

[0024] Then prepare the foam fracturing fluid base fluid, which is characterized in that 3% urea and 0.5% surfactant are mixed to form the foam fracturing fluid base fluid.

[0025] Then prepare additive, mixing mass fraction is the clay stabilizer of 0.5%, the bactericide of 0.01%, the drainage aid of 0.2%, forms additive;

[0026] Mix 30% water-based fracturing fluid base fluid, 20% foam fracturing fluid base fluid, 15% thickened acid...

Embodiment 2

[0031] First prepare the thickened acid solution: mix the polyacrylamide solution with a mass fraction of 0.8% and the konjac glucomannan solution with a mass ratio of 1:1 and add it to hydrochloric acid with a concentration of 12%. The synergistic thickening effect of mannan increases the viscosity of thickened acid.

[0032] Next, a water-based fracturing fluid base fluid was prepared by mixing carboxymethyl cellulose with a mass fraction of 15%, 10% chromium sulfate, and 3% polyacrylamide to form a water-based fracturing fluid base fluid.

[0033] Then prepare the foam fracturing fluid base fluid, which is characterized in that the mass fraction of 6% urea and 0.8% surfactant are mixed to form the foam fracturing fluid base fluid.

[0034] Then prepare additive, mixing mass fraction is 1% clay stabilizer, 0.1% bactericide, 0.6% drainage aid, forms additive;

[0035] Mix 30% water-based fracturing fluid base fluid, 30% foam fracturing fluid base fluid, 18% thickened acid fl...

Embodiment 3

[0040] First prepare the thickened acid solution: mix the polyacrylamide solution with a mass fraction of 0.8% and the konjac glucomannan solution with a mass ratio of 1:1 and add it to hydrochloric acid with a concentration of 12%. The synergistic thickening effect of mannan increases the viscosity of thickened acid.

[0041] Next, a water-based fracturing fluid base fluid was prepared by mixing carboxymethyl cellulose with a mass fraction of 15%, 10% chromium sulfate, and 3% polyacrylamide to form a water-based fracturing fluid base fluid.

[0042] Then prepare the foam fracturing fluid base fluid, which is characterized in that 10% urea and 1% surfactant are mixed to form the foam fracturing fluid base fluid.

[0043] Then prepare additive, mixing mass fraction is 2% clay stabilizer, 0.2% bactericide, 1% drainage aid, forms additive;

[0044] Mix 30% water-based fracturing fluid base fluid, 35% foam fracturing fluid base fluid, 20% thickened acid fluid, and 5% additives to...

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PUM

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Abstract

The invention relates to composite acidizing and fracturing liquid and a preparation method thereof. The fracturing liquid disclosed by the invention is prepared through adding thickened acidizing fluid and additives based on water-based fracturing base liquid and foamed fracturing base liquid and crosslinking by a crosslinker, wherein the water-based fracturing base liquid comprises carboxymethyl cellulose, chromium sulfate and polyacrylamide; the foamed fracturing base liquid comprises urea and a surfactant; the additives comprise a clay stabilizer, a microbicide and a discharge aiding agent; the thickened acidizing fluid is 12% hydrochloric acid, and a mixed solution of polyacrylamide and konjac glucomannan is added into the thickened acidizing fluid, so that the viscosity of the acidizing fluid is improved, the fracture face diffusion capacity of the acidizing fluid is lowered, and meanwhile, a colloidal reticular structure is formed to prevent hydrogen ions from moving, thus a retarding effect is exerted; in addition, the acidizing and fracturing liquid further comprises the crosslinker and the balance of water. The composite acidizing and fracturing liquid has the characteristics of relatively good high-temperature resistance and shear resistance and low damage.

Description

technical field [0001] The invention relates to a composite acidified fracturing fluid and a preparation method thereof. Background technique [0002] At present, domestic oil fields adopt conventional fracturing and acidizing technology for the development and improvement of low-permeability and low-pressure oil fields. However, the conventional fracturing and acidizing technology does not work on most oil layers, mainly because the fracturing fluid flowback is not complete, which reduces the effect of fracturing and acidizing and leads to secondary pollution. In addition, due to the small formation voids, low permeability, and poor fluidity, the squeezed fracturing fluid easily invades the oil layer, resulting in milk plugging, wax plugging, and clay swelling plugging. [0003] At present, the commonly used guar gum or hydroxypropyl guar gum fracturing fluids are mostly water-based fracturing fluids, which are suitable for offshore or desert oilfields where fresh water re...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/605C09K8/607C09K8/725C09K8/74C09K8/882C09K8/887C09K8/90C09K8/94
Inventor 王树立李建敏周诗岽金雪松周莲王蕾
Owner CHANGZHOU UNIV
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