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Cross-linking agent composition, acidic pad fluid, and application of acidic pad fluid

A technology of pre-fluid and cross-linking agent, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as reducing the fracture-making performance of pre-fluid, and achieve obvious effect, high viscosity, and obvious filtration reduction. Effect

Active Publication Date: 2016-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current pre-fluid systems are neutral or slightly alkaline liquids. When encountering hydrochloric acid in the acidification transformation, the viscosity will be reduced quickly, which will reduce the performance of the pre-fluid.

Method used

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  • Cross-linking agent composition, acidic pad fluid, and application of acidic pad fluid
  • Cross-linking agent composition, acidic pad fluid, and application of acidic pad fluid
  • Cross-linking agent composition, acidic pad fluid, and application of acidic pad fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Measure 468mL of water and place it in a mixer, add 30.0g of methyl acetate and 3.0g of potassium chloride in sequence, stir for 1min to dissolve, then slowly add 2.75g of polyacrylamide thickener (molecular weight 4.30-4.8 million), and stir until Liquid thickening, add 2.0g drainage aid (mass percentage of drainage aid consists of 1.2% of FSN-100 fluorocarbon surfactant, 13% of ethanol, Pingping plus o-15 fatty alcohol polyoxyethylene ether surfactant 15.0 %, and the balance is water), stir for 30 minutes until uniform, leave for 1 to 2 hours, and prepare the pre-liquid base liquid for later use. Get 100mL of the prepared front liquid base liquid, add 0.02g potassium persulfate capsule gel breaker, 0.6g cross-linking agent composition successively (the mass percent of cross-linking agent composition is composed of: zirconium acetate 23.0%, aluminum chloride 8.0%, glycerol 15.0%, the balance is water), cross-linked to form jelly-like acidic pre-fluid, carry out followi...

Embodiment 2

[0036] Measure 437.5 mL of water and place it in a mixer, add 60.0 g of methyl acetate and 5.0 g of potassium chloride in sequence, stir for 1 min to dissolve, then slowly add 3.0 g of polyacrylamide thickener (molecular weight 360-4.1 million), and stir To liquid thickening, add 2.5g drainage aid (mass percentage of drainage aid consists of FSN-100 fluorocarbon surfactant 1.5%, ethylene glycol 12%, add o-15 fatty alcohol polyoxyethylene ether surface 16.0% active agent, the balance being water), stirring for 30 minutes until uniform, left for 1 to 2 hours, and prepared as a pre-liquid base liquid for later use. Take 100mL of the prepared front liquid base liquid, add 0.01g potassium persulfate capsule gel breaker, 0.7g cross-linking agent composition in sequence (the mass percentage of cross-linking agent composition is composed of: zirconium acetate 23.0%, aluminum chloride 6.0%, glycerol 15.0%, and the balance is water), cross-linked to form a jelly-like acidic pre-fluid, c...

Embodiment 3

[0038] Measure 457.5 mL of water and place it in a mixer, add 40.0 g of ethyl lactate and 2.5 g of potassium chloride in sequence, stir for 1 min to dissolve, then slowly add 2.75 g of polyacrylamide thickener (molecular weight 360-4.1 million), and stir To liquid viscosification, add 2.5g drainage aid (mass percentage of drainage aid consists of 1.2% of FSN-100 fluorocarbon surfactant, 15% of ethanol, plus o-15 fatty alcohol polyoxyethylene ether surfactant 16.0%, and the balance is water), stir for 30 minutes until uniform, leave for 1 to 2 hours, and prepare the pre-liquid base liquid for later use. Take 100mL of the prepared front liquid base liquid, add 0.05g of ammonium persulfate capsule gel breaker, 0.7g of crosslinking agent composition successively (the mass percentage of crosslinking agent composition is composed of: zirconium acetate 22.0%, aluminum chloride 9.0%, glycerol 16.0%, the balance is water), cross-linked to form jelly-like acidic pre-fluid, carry out fol...

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Abstract

The invention provides a cross-linking agent composition, an acidic pad fluid containing the cross-linking agent composition, and an application of the acidic pad fluid, and belongs to the fields of reservoir chemical yield increase reconstruction in petroleum and natural gas exploration. The acidic pad fluid comprises, by mass, 6.0-16.0% of organic acid ester, 0.5-0.7% of a densifier, 0.4-1.0% of the cross-linking agent composition, 0.3-1.0% of a cleanup additive, 0.5-1.0% of potassium chloride, 0.01-0.1% of a capsule breaker, and the balance of water, the densifier is polyacrylamide, and the cross-linking agent composition comprises, by mass, 20.0-30.0% of zinc acetate, 5.0-10.0% of aluminum chloride, 10.0-20.0% of glycerol, and balance of water. The acidic pad fluid keeps high viscosity in acidifying reconstruction, has multiple effects of fracture forming, filtration reducing and acidifying, and realizes high-temperature reservoir deep acid fracturing reconstruction.

Description

technical field [0001] The invention relates to the field of reservoir chemical stimulation and transformation in the exploration and development of petroleum and natural gas, in particular to an acid fracturing treatment fluid, in particular to a liquid system for acid fracturing transformation of high-temperature reservoirs. Background technique [0002] Acid fracturing is an important stimulation measure for carbonate reservoir stimulation, especially in high temperature (120-180°C), deep well (4000-7000m) and low-permeability reservoirs, it plays a decisive role in increasing reservoir production. The acid fracturing technology for high-temperature deep wells mainly has the following difficulties: ①Due to the deep burial of the construction well section, high construction friction, limited acidification drainage, high requirements for wellhead devices and construction equipment, an acid system with good resistance reduction performance must be used , in order to increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 张燕王道成刘友权向超吴文刚孙川熊颖
Owner PETROCHINA CO LTD
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