Recovered fracturing fluid used in natural gas well

A fracturing fluid and natural gas technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in meeting construction scale, rapid gel breaking and flowback, formation pore throat and micro-fracture damage, and inability to flow back fluid. Reuse and other issues to achieve a good effect of increasing production, saving the cost of pollution prevention and control, and increasing the production of wellhead testing

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like many other water-based fracturing fluids, it has certain shortcomings: ① Difficult to meet the requirements of construction scale and rapid gel-breaking flowback
②The fracturing fluid tends to leave polymers in the formation, which will cause lasting damage to the pore throats and micro-cracks in the formation; a large amount of flowback fracturing residue will be generated during the fracturing stimulation construction, which will have a great impact on the environment
Moreover, the flowback fluid after the fracturing fluid breaks is not reusable. One-time use and post-treatment will lead to serious waste, discharge will pollute the environment, and the treatment cost is high, which is unaffordable for many enterprises.

Method used

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  • Recovered fracturing fluid used in natural gas well
  • Recovered fracturing fluid used in natural gas well
  • Recovered fracturing fluid used in natural gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 490ml of water and place it in a mixer with a volume of 1000ml, add 0.01g of fungicide D580 and 15g of potassium chloride in sequence, stir for 2 minutes to dissolve, then slowly add 2.1g of low-viscosity hydroxypropyl guar gum, stir until the liquid becomes thicker, and then Add 5.0g of drainage aid, stir evenly, and let it stand for 1-2 hours to make base liquid for later use. Take 100ml of base fluid, add 0.5g of cross-linking fluid, and record the time from adding the cross-linking fluid to forming a jelly as the cross-linking time of the fracturing fluid. The pH value of the base fluid was measured by a pH meter to be 7.8, the pH value of the crosslinked fracturing fluid was 10.2, and the crosslinking time was 67s. Using an M5500 rotational viscometer at a shear rate of 170s-1, the viscosity of the base fluid was measured to be 13.5mPa·s, and the viscosity of the cross-linked jelly reached 369mPa·s. Add 0.15 g of citric acid gel breaker to the prepared jelly,...

Embodiment 2

[0024] Take 490ml of water and place it in a mixer with a volume of 1000ml, add 0.01g of fungicide D580 and 15g of potassium chloride in sequence, stir for 2 minutes to dissolve, then slowly add 2.1g of low-viscosity hydroxypropyl guar gum, stir until the liquid becomes thicker, and then Add 5.0g of drainage aid, stir evenly, and let it stand for 1-2 hours to make base liquid for later use. Take 100ml of base fluid, add 0.45g of cross-linking fluid, and record the time from adding the cross-linking fluid to forming a jelly as the cross-linking time of the fracturing fluid. The pH value of the base fluid was measured by a pH meter to be 7.8, the pH value of the crosslinked fracturing fluid was 10.1, and the crosslinking time was 67s. Using a M5500 rotational viscometer at a shear rate of 170s-1, the viscosity of the base fluid was measured to be 13.5mPa·s, and the viscosity of the cross-linked jelly reached 389mPa·s. Add 0.1 g of hydrochloric acid breaker to the prepared jelly...

Embodiment 3

[0027] Take 490ml of water and place it in a mixer with a volume of 1000ml, add 0.01g of fungicide D580 and 12.5g of potassium chloride in sequence, stir for 2 minutes to dissolve, then slowly add 1.8g of low-viscosity hydroxypropyl guar gum, and stir until the liquid becomes thicker. Then add 5.0g of drainage aid, stir evenly, and let it stand for 1-2 hours to make base liquid for later use. Take 100ml of base fluid, add 0.4g of cross-linking fluid, and record the time from adding the cross-linking fluid to forming a jelly as the cross-linking time of the fracturing fluid. The pH value of the base fluid was measured by a pH meter to be 7.6, the pH value of the crosslinked fracturing fluid was 9.7, and the crosslinking time was 49s. Using a M5500 rotational viscometer at a shear rate of 170s-1, the viscosity of the base fluid was measured to be 10.5mPa·s, and the viscosity of the cross-linked jelly reached 246mPa·s. Add 0.12 g of citric acid gel breaker to the prepared jelly,...

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Abstract

The invention relates to recovered fracturing fluid used in a natural gas well. The fracturing fluid comprises components of, by weight: 0.25% to 0.45% of a natural plant gum thickener, 2.0% to 3.0% of potassium chloride, 0.01% to 0.02% of a bactericide, 0.40% to 1.20% of a cleanup additive, 0.3% to 0.7% of cross-linking liquid, 0.01% to 0.025% of a pH value regulator, 0.08% to 0.2% of a gel breaker, and balance of water. During on-site construction, the fracturing fluid is adopted in fracturing construction; the liquid discharged back from the stratum is settled, and filtered; silt and mechanical impurities are removed, and the liquid is stored in a tank. When fracturing construction is carried out again, the pH value regulator is added to the liquid, such that a gel is formed again, andthe gel can be used. With the recovered fracturing fluid provided by the invention, waste liquid discharging and processing can be reduced, a large amount of water can be saved, liquid blending time can be saved, and construction period can be shortened.

Description

technical field [0001] The invention relates to a recovered fracturing fluid applied to natural gas wells. Background technique [0002] At present, domestic oil and gas field fracturing construction basically adopts polymer fracturing fluid technology, that is, water-based polymer fracturing fluid, and guar gum and its derivatives are used. It has been used in the fracturing process for many years due to its low cost and good rheological control characteristics. This fracturing fluid has many advantages such as good shear resistance, good thermal stability, low content of water-insoluble matter and gel-breaking residue, and strong ability to control fluid loss. However, like many other water-based fracturing fluids, it has certain shortcomings: ① It is difficult to meet the requirements of construction scale and rapid gel breaking and flowback. ②The fracturing fluid tends to leave polymers in the formation, which will cause lasting damage to the pore throats and micro-cra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 张永国刘友权何冶张燕王小红石晓松陈鹏飞
Owner PETROCHINA CO LTD
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