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A preparing method of a high-strength high-temperature-resistance air foam fracturing fluid

A technology of air foam and high temperature resistance, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high stability and low temperature resistance, achieve super foam stability, save costs, and improve temperature resistance sexual effect

Inactive Publication Date: 2014-10-29
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although considerable progress has been made in foam fracturing fluid research, there are relatively few studies on high-stable and high-temperature-resistant foams. The existing foam systems can no longer meet the needs of high-salinity, high-temperature and harsh oil and gas reservoirs. How to further improve foam fracturing The main direction of the research and development of foam fracturing fluid is to further improve the sand-carrying ability of foam fracturing fluid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 2 g of hectorite into 300 mL of deionized water at 50°C, stir for 60 minutes, disperse evenly, then cool down to room temperature, and let it stand for 36 hours to obtain a hectorite aqueous dispersion. Add 0.8g of cetyltrimethylammonium bromide to the lithium soap dextrohydrin dispersion, stir evenly for 12h, let stand and age for 6h, add 0.6g of sodium lauryl alcohol polyoxyethylene ether sulfate, and then Stir at a speed of 5000rpm on a high-speed emulsifier for 6 minutes to obtain a high-strength and high-temperature-resistant air foam fracturing fluid. The apparent viscosity at room temperature is 200 mPa.s, the apparent viscosity at 90°C is 50 mPa.s, the foaming efficiency is 80%, the half-life is 100h, the settling time is 10h, and the water-breaking time is 30min. The apparent viscosity of cracking fluid is lower than 5mPa.s.

Embodiment 2

[0041] Add 9 g of hectorite into 300 mL of deionized water at 90°C, stir for 30 minutes, disperse evenly, then cool down to room temperature, and let it stand for 48 hours to obtain a hectorite aqueous dispersion. Add 3.6g of octadecyltrimethylammonium bromide to the lithium soap right water dispersion, stir evenly for 24h, let stand and age for 12h, add 1.5g of dodecylammonium sulfate, and then put it on the high-speed emulsifier at 10000rpm Stir for 3 minutes at a high speed to obtain a high-strength and high-temperature-resistant air foam fracturing fluid. The apparent viscosity at room temperature is 2000 mPa.s, the apparent viscosity at 90°C is 400 mPa.s, the foaming efficiency is 50%, the half-life is 768h, the settling time is 720h, and the water-breaking time is 60min. The apparent viscosity of cracking fluid is lower than 5mPa.s.

Embodiment 3

[0043] Add 3 g of laponite into 300 mL of deionized water at 60°C, stir for 50 minutes, disperse evenly, then cool down to room temperature, and leave to age for 38 hours to obtain a hectorite aqueous dispersion. Add 1.2g of cetyltriethylammonium bromide to the lithium soap right water dispersion, stir evenly for 16h, let stand and age for 8h, add 1.2g of sodium lauryl sulfate, and then put it on the high-speed emulsifier at 8000rpm Stir for 5 minutes at a high speed to obtain a high-strength and high-temperature-resistant air foam fracturing fluid. The apparent viscosity at room temperature is 400 mPa.s, the apparent viscosity at 90°C is 100 mPa.s, the foaming efficiency is 100%, the half-life is 236 hours, the settling time is 90 hours, the water-breaking time is 35 minutes, and the foam is fracturing after water-breaking Liquid apparent viscosity is lower than 5mPa.s.

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Abstract

The invention relates to a preparing method of a high-strength high-temperature-resistance air foam fracturing fluid. The preparing method includes following characteristic steps of: adding hectorite into deionized water having a temperature of 50-90 DEG C, stirring and dispersing uniformly, cooling to room temperature, allowing the mixture to stand and ageing for a certain period of time to obtain a hectorite aqueous dispersion, adding a certain amount of a cationic surfactant, uniformly stirring, allowing the mixture to stand and ageing, adding a foaming agent, and stirring at a high speed by a high-speed emulsifying machine to obtain the high-strength high-temperature-resistance air foam fracturing fluid. The half-life period of the prepared fracturing fluid is 768 h. The fracturing fluid has characteristics of super high foam stability, apparent viscosity reaching 2000 mPa.s, temperature resistance reaching 90 DEG C, high foam strength and temperature resistance, sedimentation time reaching 720 h, and high sand carrying capability, and is suitable for conventional and unconventional oil and gas resource (coal bed methane, shale gas, shale oil, and the like) exploration and development.

Description

technical field [0001] The invention relates to a method for preparing a high-strength and high-temperature-resistant air foam fracturing fluid. The high-strength and high-temperature-resistant air foam fracturing fluid prepared by the invention is suitable for conventional and unconventional oil and gas resources (coal bed methane, shale gas and shale gas) rock oil, etc.) exploration and development. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs, and fracturing fluid is an important part of fracturing technology. At present, the most commonly used fracturing fluid at home and abroad is water-based fracturing fluid, which can be roughly divided into three types: (1) natural vegetable gum fracturing fluid; (2) cellulose fracturing fluid; (3) synthetic Polymer fracturing fluid. With the advancement of hydraulic fracturing technology, high-viscosity cross-linked fract...

Claims

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Application Information

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IPC IPC(8): C09K8/70
CPCC09K8/703
Inventor 万涛邹矗张徐敏李蕊香程文忠
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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