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Gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid

A technology of oil-in-water and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems affecting the smooth flowback of fracturing fluid, and achieve good comprehensive performance of liquid, good anti-swelling effect, Ease of use

Inactive Publication Date: 2014-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, after the fracturing task is completed, the fracturing fluid needs to be returned to the ground as soon as possible. If the emulsion is not broken, the displacement pressure will reverse after fracturing, and flowback will also occur in the pore throats existing in the sand pack and the near-wellbore zone. Resistance, which affects the smooth flowback of fracturing fluid

Method used

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  • Gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid
  • Gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid
  • Gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0021] ① Formula of emulsified stock solution at 60°C: 0.5% HPGUR powder, 10% KCL, 0.5% XJHX-08, 1% ZJ-07 drainage aid, 0.3% KNF fungicide, 0.5% SP-80, 1% PR-1 and 0.02% sodium hydroxide.

[0022] ②Preparation method: Take 1000ml of water and place it in a 1000ml Wuyin mixer, add 100g of KCL, stir to dissolve, add 5.0g of hydroxypropyl guanidine gum powder, stir for 2 minutes to dissolve and increase viscosity, then add 2ml of XJHX-08, 10ml of ZJ -07 drainage aid, 3ml KNF bactericide, 5ml SP-80 emulsifier, 10ml PR-1 demulsifier, 0.2g sodium hydroxide, stir evenly, place in a 1000ml beaker and let it stand for 4 hours to make a base liquid for later use.

[0023] ③Crosslinking liquid formula: 1.5% YGB organic boron crosslinking agent + 0.6% sodium persulfate; take 100ml of water and put it in a 200ml beaker, add 1.5ml of YGB organic boron crosslinking agent, add 0.6g of sodium persulfate, stir Evenly, make a cross-linking solution for later use.

[0024] ④Cross-linking ratio:...

Embodiment 2

[0027] ① 70°C emulsified stock solution formula: 0.55% HPGUR powder + 10% KCL + 0.5% XJHX-08 + 1% ZJ-07 drainage aid + 0.3% KNF fungicide + 0.5% OP-10 + 1% WT-1 + 0.5% KXDT-1+0.024% sodium hydroxide

[0028] ②Preparation method: Take 1000ml of water and put it in a 1000ml Wuyin mixer, add 100g of KCL, stir to dissolve, add 5.5g of hydroxypropyl guanidine gum powder, stir for 2 minutes to dissolve and increase viscosity, then add 2ml of XJHX-08, 10ml of ZJ -07 drainage aid, 3ml KNF bactericide, 5ml OP-10, 10WT-1 emulsifier, 5ml KXDT-1 demulsifier, 0.24g sodium hydroxide, stir evenly, place in a 1000ml beaker and let it stand for 4 hours to make the base liquid for use.

[0029] ③Crosslinking liquid formula: 1.5% YGB organic boron crosslinking agent + 1% HT stabilizer + 0.25% sodium persulfate; take 100ml of water and put it in a 200ml beaker, add 1.5g of YGB organic boron crosslinking agent, add HT Stabilizer 1g, add sodium persulfate 0.25g, stir evenly, make cross-linking li...

Embodiment 3

[0033] ① 85°C emulsified stock solution formula: 0.65% HPGUR powder + 10% KCL + 0.5% XJHX-08 + 1% ZJ-07 drainage aid + 0.3% KNF fungicide + 1% OP-10 + 3% WT-1 + 1% KXDT-1+0.026% sodium hydroxide

[0034] ②Preparation method: Take 1000ml of water and place it in a 1000ml Wuyin mixer, add 100g of KCL, stir to dissolve, add 6.5g of hydroxypropyl guanidine gum powder, stir for 2 minutes to dissolve and increase viscosity, then add 2ml of XJHX-08, 10ml of ZJ -07 drainage aid, 3ml KNF bactericide, 10ml OP-10, 30WT-1 emulsifier, 10ml KXDT-1 demulsifier, 0.26g sodium hydroxide, stir evenly, place in a 1000ml beaker and let it stand for 4 hours to make the base liquid for use.

[0035] ③Crosslinking liquid formula: 2% YGB organic boron crosslinking agent + 2% HT stabilizer + 0.2% sodium persulfate; take 100ml of water and put it in a 200ml volume beaker, add 2g of YGB organic boron crosslinking agent, add HT to stabilize Add 2g of sodium persulfate, add 0.2g of sodium persulfate, sti...

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Abstract

The present invention relates to a gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid, which comprises, by mass, 0.5-0.65% of hydroxypropyl guar gum, 1-15% of KCl, 0.1-2% of OP-10, 0.5-3% of WT-1, 1% of a cleanup additive, 0.5-2% of an emulsion breaker, 0.5-2% of a clay stabilizer, 0.01-0.1% of a bactericidal agent, 0.01-0.03% of sodium hydroxide, 5-40% of diesel fuel, and the balance of water. With the gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid, a use effect of the fracturing fluid can be substantially increased, such that the fracturing fluid can be subjected to complete gel breaking, and emulsion breaking can be performed under the stratum condition.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing, and relates to a diesel emulsified water-based guar gum fracturing fluid system, and is especially suitable for fracturing reconstruction of crude oil reservoirs with strong water sensitivity, high fracture and high fluid loss. Background technique [0002] In the current oilfield exploration process, we often encounter oil reservoirs with special structures, many fault blocks, and many fractures. Most of them are characterized by complex reservoir types, large changes in lithology and physical properties in the vertical and horizontal directions, and more water sensitivity. strong. For example, the Xiaoguai fractured oil reservoir in Xinjiang and the Toutunhe oil reservoir in Fudong area. These reservoirs generally show good oil content, but they must undergo fracturing before they can be put into production. Due to the particularity of the reservoir, conventional water-based frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/665C09K8/602C09K8/605C09K8/685C09K8/885C09K2208/12C09K2208/26
Inventor 李彦林刘炜王瑛张永晖韩飞鹏孔丽娜任家萍
Owner PETROCHINA CO LTD
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