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A composite densifier fracturing fluid

A fracturing fluid and thickening agent technology, applied in the field of chemicals, can solve the problems of affecting the conductivity of propped fractures, hindering the production of formation fluids, affecting the productivity of oil and gas wells, etc. Excellent effect of joint performance, temperature resistance and shear resistance

Active Publication Date: 2016-03-02
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

High thickener residue content will seriously affect the conductivity of propped fractures, forming a thick and dense filter cake on the fracture wall, hindering the production of formation fluids, causing reservoir damage, and affecting the productivity of oil and gas wells

Method used

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  • A composite densifier fracturing fluid
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 950ml of water to the Wuyin mixer, add 5g of KCl and 1g of formaldehyde while stirring, weigh 1g of hydroxypropyl guar gum and 40g of modified starch, add them slowly to the water while stirring, and stir at high speed for 15min ; then add 1g sodium thiosulfate, 1g sodium carbonate and 1g cetyltrimethylammonium bromide; stir in a mixer for 10min to complete the preparation of the base liquid; take the above prepared base liquid 100ml, stir Add 0.3g of sodium tetraborate, continue to stir for 2 minutes, the base liquid and the crosslinking agent react completely to form a jelly, and complete the preparation of the jelly; add 0.3g of ammonium persulfate capsule breaker to the jelly under stirring, Maintain a constant temperature in a water bath at 50°C. After 2 hours, the jelly is completely broken and hydrated. The apparent viscosity of the base liquid measured by a six-speed rotational viscometer is 80mPa.s, and the pH is 10; the rheological properties of the jelly ...

Embodiment 2

[0033] Add 934ml of water to the Wuyin mixer, add 20g of KCl and 3g of formaldehyde under stirring, weigh 2g of hydroxypropyl guar gum and 30g of modified starch, add them slowly to the water under stirring, and stir at high speed for 15min ; then add 5g sodium thiosulfate, 3g sodium carbonate and 3g dodecyltrimethylammonium bromide; stir in a mixer for 10min to complete the preparation of the base liquid; get the above prepared base liquid 100ml, stir Add 0.6g organoboron-zirconium crosslinking agent, continue to stir for 2 minutes, the base liquid and the crosslinking agent completely react to form a jelly, and complete the preparation of the jelly solution; add 0.6g ammonium persulfate capsules to the jelly under stirring state to break For the gel, keep a constant temperature in a water bath at 50°C. After 2 hours, the gel will be completely broken and hydrated. The apparent viscosity of the base liquid measured by a six-speed rotational viscometer is 55mPa.s, and the pH i...

Embodiment 3

[0037] Add 930ml of water to the Wuyin mixer, add 20g of KCl and 3g of formaldehyde under stirring, weigh 3g of hydroxypropyl guar gum and 20g of modified starch, add them slowly to the water under stirring, and stir at high speed for 15min ; then add 3g sodium thiosulfate, 2g sodium carbonate and 2g cetyltrimethylammonium bromide; stir in a mixer for 10min to complete the preparation of the base liquid; get the above prepared base liquid 100ml, stir Add 1g of organoboron cross-linking agent, continue to stir for 2 minutes, the base liquid and the cross-linking agent completely react to form a jelly, and complete the preparation of the jelly solution; add 1g of ammonium persulfate capsule breaker to the jelly under stirring, Maintain a constant temperature in a water bath at 50°C. After 2 hours, the jelly is completely broken and hydrated. The apparent viscosity of the base liquid measured by a six-speed rotational viscometer was 45mPa.s, and the pH was 11; the rheological pro...

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Abstract

A composite densifier fracturing fluid is disclosed, and comprises 0.1-0.3% by weight of hydroxypropyl guar gum, 2-4% by weight of modified starch, 0.5-2% by weight of a clay stabilizer, 0.1-0.5% by weight of a temperature stabilizer, 0.1-1% by weight of a cleanup additive, 0.1-0.3% by weight of a bactericide and 0.1-0.3% by weight of a pH adjusting agent, with the balance being water. The modified starch is prepared by subjecting waxy starch to acetylization modification by adopting acetic anhydride, performing phosphorylation modification by adopting sodium trimetaphosphate or phosphorus oxychloride, subjecting the modified product to spray drying, and pre-gelatinizing. Defects in the prior art that contents of water insoluble substances and dregs after gel breaking are high, the cost is high, and the like in conventional guanidine gum fracturing fluid systems are overcome. The composite densifier fracturing fluid which is low in harm and low in cost is prepared.

Description

technical field [0001] The invention relates to a chemical used in the field of oil field stimulation improvement measures, in particular to a compound thickener fracturing fluid. Background technique [0002] The commonly used fracturing fluids at home and abroad are water-based fracturing fluids, among which the water-based fracturing fluids with natural polysaccharide plant gums as thickeners are the most widely used. However, since the natural polysaccharide vegetable gum contains 6% to 8% water-insoluble matter, the water-based fracturing fluid is not completely broken, resulting in more residues in the formation, causing damage to the formation and seriously affecting the quality of the reservoir. Transformation effect. Statistics show that the damage rate of water-based fracturing fluid to reservoir permeability reaches 30%-45% on average, the highest is over 60%, and the damage to fracture support zone reaches over 70%. [0003] The selection principle of the thick...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 邹鹏潘艳萍李诗仙张武任秋军
Owner BC P INC CHINA NAT PETROLEUM CORP
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