Foaming agent and acidic cross-linking foam breakdown fluid

A technology of foam fracturing fluid and foaming agent, which is applied in the fields of foaming agent for oil field fracturing and acidic cross-linked foam fracturing fluid. Liquid, affecting the foaming and foam stabilization performance of foam fracturing fluid, etc., to achieve the effect of less adsorption

Inactive Publication Date: 2004-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, water-based fracturing fluid is generally used in oil field fracturing stimulation, but it cannot meet the needs of low-pressure water-sensitive oil and gas reservoir fracturing
Regular N 2 Foam fracturing fluid cannot satisfy CO2 because it is a neutral or alkaline medium 2 Requirements for acidic medium system (pH=3~4), unable to form acidic cross-linked jelly
Generally, the foaming agents used in fracturing are mostly anionic or cationic systems. Anionic foaming agents cannot meet the needs of high-salinity fracturing fluids and formation water, while cationic foaming agents are severely adsorbed on sandstone formation rocks, which affects foam fracturing. Foaming and stabilizing properties of liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 500ml of water and place it in a mixer with a capacity of 1000ml, add 5g of potassium chloride, stir for 2 minutes to dissolve, then slowly add 3.0g of guar gum, stir for 5 minutes to dissolve and increase viscosity, add 4.0ml of foaming agent, stir evenly, and place for 4 ~ 6 hours, make the base liquid for later use. Zirconium oxychloride is formulated into a 30% aqueous solution, and then 1.5% ammonium persulfate is added to dissolve to form a crosslinking agent. Take 100ml of base liquid and add 1.5ml of cross-linking agent to form a cross-linked jelly. With a wide range of pH test paper, the pH value of the base fluid is 7.0, and the pH value of the cross-linked foam fracturing fluid is 4.0. Using the RV20 rotational viscometer at 170s -1 Under the shear rate, the measured viscosity of the base fluid is 96.0mPa.s, the viscosity of the acidic cross-linked jelly is 439mPa.s, and the CO 2 The viscosity of foam fracturing fluid is 324mPa.s.

Embodiment 2

[0020] Take 500ml of water and place it in a mixer with a capacity of 1000ml, add 10g of potassium chloride, stir for 2 minutes to dissolve, then slowly add 3.5g of hydroxypropyl guar gum, stir for 5 minutes to dissolve and increase viscosity, add 4.0ml of foaming agent, and stir evenly , placed for 4 to 6 hours, made into a base liquid for later use. Zirconium oxychloride is formulated into a 30% aqueous solution, and then 1.5% ammonium persulfate is added to dissolve to form a crosslinking agent. Take 100ml of base liquid and add 3ml of cross-linking agent to form a cross-linked jelly. Using a wide range of pH test paper, the pH value of the base fluid is 7.0, the pH value of the cross-linked foam fracturing fluid is 4.0, the viscosity of the base fluid is 99.0mPa.s, and the viscosity of the acidic cross-linked jelly is 458mPa.s. The loop test device measured CO 2 The viscosity of foam fracturing fluid is 344mPa.s.

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Abstract

The invention relates to a novel fracturing fluid of foaming agent and acidic cross bonding foams for fracturing, wherein the foaming agent comprises ampholytic surface active agent e.g. alkyl dimethyl acetate, anionic surface active agent e.g. alkyl sodium sulfonate and low molecular alcohol e.g. ethanol, it solves the problems of poor foamability and difficult acidic coupling of the single component foaming agent, thus is a foaming agent and fracturing fluid architecture suitable for oil field CO2 foam fracturing.

Description

[0001] Involved areas [0002] The invention relates to a foaming agent and acidic cross-linked foam fracturing fluid for oil field fracturing. Background technique [0003] At present, water-based fracturing fluid is generally used in oil field fracturing stimulation, but it cannot meet the needs of low-pressure water-sensitive oil and gas reservoir fracturing. Regular N 2 Foam fracturing fluid cannot satisfy CO2 because it is a neutral or alkaline medium 2 The requirement of acidic medium system (pH=3~4), cannot form acidic cross-linked jelly. Generally, the foaming agents used in fracturing are mostly anionic or cationic systems. Anionic foaming agents cannot meet the needs of high-salinity fracturing fluids and formation water, while cationic foaming agents are severely adsorbed on sandstone formation rocks, which affects foam fracturing. Foaming and foam stabilizing properties of the liquid. Contents of the invention [0004] The object of the present invention is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 卢拥军丁云宏舒玉华杜长虹陈彦东杨艳丽林英姬邱晓慧杨振周曾斌
Owner PETROCHINA CO LTD
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