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Acidic visco-elastic fluid, its preparation method and application thereof

A viscoelastic and fluid technology, applied in the field of acid viscoelastic fluid and its preparation, can solve the problems of reducing formation permeability, incomplete gel breaking, residual microgel, etc., and achieves decontamination, seepage resistance, and good sand-carrying performance. , the effect of low interfacial tension

Inactive Publication Date: 2012-05-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of these fracturing fluid systems lies in the residues, which mainly come from two aspects: ① water-insoluble substances in the vegetable gum itself; ② microgels left after the gel is not completely broken
However, these polymers still produce a large amount of residue after breaking the gel and damage the formation
In addition, incomplete dissolution of the cross-linked polymer will form "fish eyes", which will reduce the permeability of the formation

Method used

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  • Acidic visco-elastic fluid, its preparation method and application thereof
  • Acidic visco-elastic fluid, its preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Prepare Agent A

[0049] Get 70g of eicosyltrimethylammonium chloride, 25g of methanol, and 5g of acetic acid. Thoroughly stir and dissolve the above substances, prepare a clear and transparent solution, and prepare Agent A with a viscosity of 10mPa·s.

[0050] (2) Preparation of agent B

[0051] Take 24g of cetyltrimethylammonium bromide, 15g of methanol, 36g of salicylic acid, and 10g of sodium hydroxide. Add the above substances into 15ml of water successively under stirring condition, fully stir and dissolve to form a reddish-brown clear liquid, and prepare agent B with a viscosity of 8mPa·s.

[0052] (3) Preparation of viscoelastic fluid

[0053] Take 24ml of analytically pure hydrochloric acid and dissolve 3g of KCL in 100ml of water. After fully dissolving, add a certain amount of corrosion inhibitor, add 6ml of agent A under stirring, and then add 1ml of agent B. The formed viscoelastic fluid has a viscosity of 160mPa·s, has good viscoelasticity and sand...

Embodiment 2

[0055] (1) Prepare Agent A

[0056] Take 70g of octadecyltrimethylammonium chloride, 17g of methanol, 8g of isopropanol, and 5g of acetic acid. Fully stir and dissolve the above substances, and prepare a clear and transparent solution with a viscosity of 8mPa·s Agent A.

[0057] (2) Preparation of Agent B

[0058] Get 24g of cetyltrimethylammonium chloride, 15g of methanol, 36g of salicylic acid, and 10g of sodium hydroxide. Add the above substances into 15ml of water sequentially under stirring condition, fully stir and dissolve to form reddish-brown clear liquid, agent B with a viscosity of 8mPa·s.

[0059] (3) Preparation of viscoelastic fluid

[0060] Take 24ml of analytically pure hydrochloric acid and dissolve 3g of KCL in 100ml of water. After fully dissolving, add a certain amount of corrosion inhibitor, add 6ml of agent A under stirring, and then add 1ml of agent B. The formed viscoelastic fluid has a viscosity of 165mPa·s, has good viscoelasticity and sand-carryi...

Embodiment 3

[0062] (1) Prepare Agent A

[0063] Get 70g of rapeseed oil-trimethylammonium chloride, 17g of methanol, and 8g of isopropanol. Fully stir and dissolve the above substances, and prepare a clear and transparent solution, A agent with a viscosity of 12mPa·s.

[0064] (2) Preparation of Agent B

[0065] Take 24g of tetradecyltrimethylammonium chloride, 15g of methanol, 36g of salicylic acid, and 10g of sodium hydroxide. Add the above substances into 15ml of water sequentially under stirring condition, fully stir and dissolve to form reddish-brown clear liquid, agent B with a viscosity of 8mPa·s.

[0066] (3) Preparation of viscoelastic fluid

[0067] Take 24ml of analytically pure hydrochloric acid and dissolve 3g of KCL in 100ml of water. After fully dissolving, add a certain amount of corrosion inhibitor, add 6ml of agent A under stirring, and then add 1ml of agent B. The formed viscoelastic fluid has a viscosity of 170mPa·s, has good viscoelasticity and sand-carrying perfo...

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Abstract

The invention relates to an acidic visco-elastic fluid, its preparation method and an application thereof. The fluid contains one or more cationic surfactants selected from a certain quaternary ammonium salt, a certain amine and a combination, one or more acids, one or more higher alcohols, one or more counter-ion salts, one or more corrosion inhibitors and water. The acidic visco-elastic fluid provided by the invention can be used for oilfield fracturing. On the application scene, each component is mixed and prepared into an aqueous solution of a certain mass percent; the aqueous solution isuniformly stirred and is punched together with a fracturing proppant into a well. The fracturing proppant in the fracturing fluid is uniformly dispersed and viscosity is broken completely.

Description

technical field [0001] The invention relates to an acidic viscoelastic fluid and its preparation method and application. The acidic viscoelastic fluid can be used for oil field fracturing and acidizing stimulation. Background technique [0002] Hydraulic fracturing refers to methods that induce the production of fluids, such as oil and natural gas, from subterranean rock formations. During hydraulic fracturing, a fracturing fluid is injected through the wellbore and against the formation at a pressure and flow rate at least sufficient to overcome the overburden pressure and trigger fractures in the formation and / or propagate fractures into the formation. The fracturing fluid is usually loaded with proppant, such as 20-40 mesh sand, alumina, glass beads, etc., suspended in the fracturing fluid and to be transported into the fracture. Proppants are used to prevent the formation from closing on itself when the pressure is relieved. The proppant-filled fractures form permeable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 张士诚张劲张艳李双明庄照锋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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