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Fracturing fluid capable of resisting high salinity water quality

A high-salinity, fracturing fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems that cannot meet the requirements of on-site construction, achieve good economic benefits, improve success rate, and resist gelling. High temperature and shear resistance

Active Publication Date: 2012-10-31
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of the jelly formed from the base liquid prepared with industrial water remained above 100mpa s after continuous shearing at 70°C for 60 minutes; while the jelly formed from the surface water in the well area of ​​Di 195-34 was continuously sheared by the rheometer. , after 7 minutes, the viscosity drops below 50mpa·s, which cannot meet the requirements of on-site construction

Method used

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  • Fracturing fluid capable of resisting high salinity water quality
  • Fracturing fluid capable of resisting high salinity water quality
  • Fracturing fluid capable of resisting high salinity water quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 (burial depth ≤ 1700m)

[0053] (1) Preparation of base liquid:

[0054] Proportion of base liquid:

[0055] 98.65kg of high salinity surface water, 0.1kg of chelating co-solvent, 0.3kg of thickener, 0.1kg of fungicide, 0.3kg of clay stabilizer, 0.5kg of demulsification and drainage aid, 0.05kg of chelating stabilizer;

[0056] The preparation process is as follows: in the case of pump circulation or agitator stirring, slowly add the above mass parts of chelating co-solvent, fungicide, thickener, clay stabilizer to the above mass parts of high salinity surface water , Demulsification aid and chelating stabilizer, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed, the thickener is fully swollen, and a uniform liquid is formed;

[0057] (2) Preparation of cross-linking solution:

[0058] Proportion of crosslinking liquid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;

[0059] The preparation process is as follow...

Embodiment 2

[0063] Example 2 (burial depth ≥ 2700m)

[0064] Basically the same as Example 1, the difference is: the proportioning of the base liquid: high salinity surface water 98.2kg, chelating cosolvent 0.15kg, thickener 0.4kg, bactericide 0.15kg, clay stabilizer 0.5kg , demulsification aid drainage agent 0.5kg, chelating stabilizer 0.1kg;

[0065] Proportion of crosslinking liquid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;

[0066] The proportion of fracturing fluid: base fluid 99.5kg, cross-linking fluid 0.8kg.

Embodiment 3

[0067] Example 3 (1700m≤burial depth≤2200m)

[0068] Basically the same as Example 1, the difference is: the proportioning of the base liquid: high salinity surface water 98.3kg, chelating cosolvent 0.15kg, thickener 0.35kg, bactericide 0.10kg, clay stabilizer 0.5kg , 0.5 parts of demulsification aid and drainage agent, 0.1 kg of chelating stabilizer;

[0069] Proportion of crosslinking liquid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;

[0070] Fracturing fluid ratio: base fluid 99.3kg, cross-linking fluid 0.6kg;

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Abstract

The invention relates to a fracturing fluid capable of resisting high salinity water quality. The fracturing fluid is characterized by being composed of a base fluid and a cross-linking fluid which are fully mixed in proportion. The base fluid contains a chelate cosolvent and a chelate stabilizer, wherein the chelate cosolvent can restrain high salinity of water quality and promote swelling of guanidine gum. The base fluid comprises 98.2-98.65 parts of high salinity surface water, 0.1-0.15 part of the chelate cosolvent,0.3-0.4 part of thickener, 0.1-0.15 part of bactericide, 0.3-0.5 part of clay stabilizer, 0.5 part of demulsifying cleanup agent and 0.05-0.1 part of the chelate stabilizer; the cross-linking fluid comprises 50 parts of water, 50 parts of organic cross-linking agents and 0.35 part of gel breaker; and the fracturing fluid comprises 99.2-99.5 parts of the base fluid and 0.5-0.8 part of the cross-linking fluid. By aid of the fracturing fluid, water resources can be saved effectively, and the success rate for fracturing construction can be improved.

Description

technical field [0001] The invention relates to a fracturing fluid used for oilfield fracturing construction, in particular to a high-salinity-resistant water quality fracturing fluid. It belongs to the field of oil and gas layer exploitation. Background technique [0002] In the prior art, the fracturing fluid used in the fracturing process of oil and gas fields is mainly water-based gel fracturing fluid. The conventional fracturing fluid formula used in the Jiyuan area has the following incompatibility: [0003] (1) The water-based jelly fracturing fluid currently used in the field is mainly plant glue, which has strict requirements on the pH value, salinity, impurity content, turbidity, and bacteria of the water quality of the mixed liquid, otherwise the liquid cannot be mixed , or cause fracturing fluid to degrade, deteriorate, and rot; [0004] (2) The construction water collected from the Jiyuan area is weakly acidic and slightly yellowish in color. The swelling sp...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 孙虎宁治军谢璇高光辉彭树禹高燕宁治新卫娟安琳
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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