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Low-temperature fracturing fluid

A fracturing fluid and low-temperature technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as residual polymers, contamination of support fractures, and impact on construction reliability, so as to avoid continuous viscosity reduction and stable Effect of Temperature Resistance and Shear Resistance

Inactive Publication Date: 2014-06-25
湖北菲特沃尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But even so, when the temperature is lower than 30°C, this method still cannot meet the requirements of fracturing fluid gel breaking
[0008] Moreover, persulfate is an acidic substance, increasing the dosage will have adverse effects on the cross-linking and viscosity of the fracturing fluid, and it will always decrease during the fracturing process. The viscosity of fracturing fluid affects the reliability of construction
In addition, for this fracturing fluid that relies on persulfate to break the gel, the filter cake formed in the low-temperature formation and the concentrate around it cannot break the gel or only partially breaks the gel, and polymers are likely to remain in the formation propped fractures. Severe pollution caused by support cracks

Method used

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  • Low-temperature fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 90m3 water into the container with a total capacity of 100m3 on site, start the vacuum jet pump circulation, slowly add 250Kg hybrid fenugreek powder through the suction port of the jet pump, and then add 50Kg crude oil demulsifier, 300Kg drainage aid, and 100Kg fungicide respectively , 500Kg clay stabilizer, and continue to circulate until the liquid is fully mixed to form a fracturing fluid base fluid L1 with a hybrid fenugreek powder concentration of 0.25%.

[0053] During fracturing construction, while pumping solution L1, mix 300Kg borate and base fluid L1 at the ratio of "base fluid L1: borate = 100Kg: 0.3Kg" to form fracturing fluid and use it for well temperature The oil layer at 25°C is subjected to fracturing stimulation.

Embodiment 2

[0055] Dissolve 30Kg of ammonium persulfate and 30Kg of sodium sulfite in 300K water, then mix with 300Kg of borate to form a cross-linking solution M.

[0056]Add 90m3 water into the container with a total capacity of 100m3 on site, start the vacuum jet pump circulation, slowly add 250Kg hybrid fenugreek powder through the suction port of the jet pump, and then add 50Kg crude oil demulsifier, 300Kg drainage aid, and 100Kg fungicide respectively , 500Kg clay stabilizer, and continue to circulate until the liquid is fully mixed to form a fracturing fluid base fluid L2 with a hybrid fenugreek powder concentration of 0.25%.

[0057] During fracturing construction, while pumping solution L2, mix crosslinking fluid M and base fluid L2 at the ratio of "base fluid L2: crosslinking fluid M = 100Kg: 0.6Kg" to form fracturing fluid and use it in wells Oil reservoirs with a temperature of 25°C are subjected to fracturing stimulation. the

Embodiment 3

[0059] Add 90 m3 of water to a container with a total capacity of 100 m3 on site, start the vacuum jet pump circulation, slowly add 300 Kg of hybrid fenugreek powder through the suction port of the jet pump, and then 500Kg of drainage aid, 100Kg of fungicide, and 500Kg of clay for stabilization agent, 500Kg foaming agent, and continue to circulate until the liquid is fully mixed to form a fracturing fluid base fluid L3 with a hybrid fenugreek rubber powder concentration of 0.3%.

[0060] During fracturing construction, while pumping solution L3, mix 400Kg of borate and base fluid L3 at the ratio of "base fluid L3: borate = 100Kg: 0.4Kg" to form fracturing fluid and use it for well temperature The natural gas wells at 30°C were fractured.

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Abstract

The invention relates to a low-temperature fracturing fluid which is prepared by the following steps: dissolving 0-0.2 part of peroxide and 0-0.5 part of reducing agent by less than or equal to 20 parts of clean water, then, adding 0.03-20.0 parts of borate, and uniformly mixing to prepare a crosslinking solution; preparing a basic solution by the rest of 99.82-70.5 parts of clean water for preparing the crosslinking agent, 0.15-0.8 part of hybrid fenugreed gum powder, 0-1.0 part of crude oil demulsifier, 0-2.0 parts of clean up additive, 0-2.0 parts of foaming agent, 0-1.0 part of bactericide and 0-2.0 parts of clay stabilizer; then, mixing the crosslinking solution with the basic solution in proportion to form the fracturing fluid.

Description

technical field [0001] The invention relates to a fracturing fluid used in low-temperature oil and gas wells (including shale gas and coalbed methane) fracturing stimulation process, specifically, hybrid fenugreek powder is used as thickener and boric acid ester as thickener. A low-temperature fracturing fluid with a cross-linking agent. [0002] Background technique [0003] In the fracturing process of oil and gas wells, the fracturing fluid used in the prior art is mainly a high-viscosity elastic fracturing fluid with high-molecular plant gum (such as guar gum and its derivatives) as a thickener, so that there is enough Excellent viscosity and good shear resistance to carry proppant into the formation and support fractures. After the fracturing operation is completed, the fracturing fluid must be broken into a low-viscosity liquid, so that the liquid can be smoothly flowed back to the ground to make way for the crude oil and natural gas in the formation. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/602C09K8/605C09K8/887C09K8/905
Inventor 吴新荣
Owner 湖北菲特沃尔科技有限公司
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