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Fracturing fluid prepared from simulated stratum produced water or stratum produced water

A technology for simulating formation and produced water, applied in the field of fracturing fluid, it can solve the problems of perishability and alkali-sensitive damage to the bottom layer, and achieve the effects of protecting the environment, saving water resources and energy, and preventing changes.

Active Publication Date: 2011-11-02
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

[0006] The purpose of the present invention is to provide a fracturing fluid prepared by simulating the produced water from the formation or directly using the produced water from the formation to overcome the problems of easy deterioration, alkali-sensitive damage to the bottom layer and hydration expansion of the currently used fracturing fluid. Achieve the purpose of saving resources and reducing damage to the formation

Method used

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  • Fracturing fluid prepared from simulated stratum produced water or stratum produced water
  • Fracturing fluid prepared from simulated stratum produced water or stratum produced water
  • Fracturing fluid prepared from simulated stratum produced water or stratum produced water

Examples

Experimental program
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Effect test

Embodiment １

[0034] 10m on site 3 Add 9560Kg of water to the container, and slowly add 25Kg of thickener while circulating with a pump or agitator, then add 400Kg of potassium chloride, 10Kg of crude oil demulsifier, and 5Kg of sodium lauryl sulfate, and continue to circulate or Stir for 30 minutes so that the liquid is fully mixed and the thickener is fully swollen to form a base liquid.

[0035] 5m on site 3 Add 4975Kg of water to the container, add 5Kg of zirconium oxychloride and 20Kg of ammonium persulfate while stirring with a pump or stirrer, continue to circulate or stir for 30 minutes, so that the zirconium oxychloride and ammonium persulfate are dissolved and mixed fully , to form a cross-linking solution containing a breaker with a content of 0.1% zirconium oxychloride.

[0036] During fracturing construction, while pumping the base fluid, mix the crosslinking fluid with the base fluid at a volume ratio of base fluid: crosslinking fluid = 100 liters: 1 liter to form a fracturi...

Embodiment 2

[0039] 10m on site 3 Add 9540Kg of water to the container, and slowly add 35Kg of thickener while circulating with a pump or stirrer, then add 400Kg of potassium chloride, 10Kg of crude oil demulsifier, and 15Kg of sodium lauryl sulfate, and continue to circulate or Stir for 30 minutes so that the liquid is fully mixed and the thickener is fully swollen to form a base liquid.

[0040] 2m on site 3 Add 980Kg of water to the container, and add 1000Kg of triethanolamine zirconate and 20Kg of ammonium persulfate while circulating with a pump or stirring with a stirrer, and continue to circulate or stir for 30 minutes, so that the triethanolamine zirconate and ammonium persulfate dissolve and Mix well to form a cross-linking solution.

[0041] During fracturing construction, while pumping the base fluid, mix the crosslinking fluid with the base fluid at a volume ratio of base fluid: crosslinking fluid = 100 liters: 0.2 liters to form a fracturing fluid.

[0042] The above fractu...

Embodiment 3

[0044] 10m on site 3 Add 9950Kg of formation produced water into the container, and slowly add 30Kg of thickener, then add 10Kg of crude oil demulsifier, 10Kg of sodium lauryl sulfate, and continue to circulate or stir for 30 minutes , so that the liquid is fully mixed and the thickener is fully swollen to form a base liquid.

[0045] 5m on site 3 Add 4975Kg of water to the container, add 5Kg of zirconium oxychloride and 20Kg of ammonium persulfate while stirring with a pump or stirrer, continue to circulate or stir for 30 minutes, so that the zirconium oxychloride and ammonium persulfate are dissolved and mixed fully , to form a cross-linking solution containing a breaker with a content of 0.1% zirconium oxychloride.

[0046] During fracturing construction, while pumping the base fluid, mix the crosslinking fluid with the base fluid at a volume ratio of base fluid: crosslinking fluid = 100 liters: 1 liter to form a fracturing fluid.

[0047] The above fracturing fluids are...

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Abstract

The invention relates to a fracturing fluid used in the technology of fracturing stimulation in oil wells or natural gas wells, and specifically relates to a fracturing fluid prepared from simulated stratum produced water or stratum produced water. The invention is characterized in that: the fracturing fluid comprises a base fluid and a crosslinked fluid, wherein the base fluid accounts for 60% to 99.99% of the total fracturing fluid and the crosslinked fluid accounts for 0.01% to 40.0% of the total fracturing fluid. The base fluid in preparation with simulated stratum produced water comprises: water 91% to 98.9% of the total base fluid, inorganic salt 1% to 8% of the base fracturing fluid, and a thickening agent 0.1% to 1.0% of the total base fluid. The base fluid in preparation with stratum produced water comprises: stratum produced water 99% to 99.9% of the total base fluid, and a thickening agent 0.1% to 1.0% of the total base fluid. The fracturing fluid provided in the invention overcomes the problems that conventional fracturing fluids are easy to deteriorate and cause alkali-sensitivity damage and hydration swelling to understrata, and achieves the purposes of saving resources and reducing damage to strata.

Description

technical field [0001] The invention relates to a fracturing fluid used in the fracturing stimulation process of an oil well or a natural gas well, in particular to a fracturing fluid prepared by simulating the produced water of the formation or directly using the produced water of the formation. Background technique [0002] The existing fracturing fluids used in the fracturing reconstruction of oil and gas fields are mainly water-based gel fracturing fluids. Water-based gel fracturing fluids generally have the following disadvantages: [0003] 1. More than 90% of the water-based jelly fracturing is mainly plant glue, and there are strict requirements on the pH value, salinity, and bacteria of the water quality of the liquid preparation, otherwise it will easily lead to degradation, deterioration or even corruption of the fracturing fluid ; [0004] 2. The formed fracturing fluid is generally in an alkaline cross-linking environment, which is likely to cause alkali-sensiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 孙虎刘国良张冕廖乐军韩文哲李婧赵文钢吕莉郭伟林
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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