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A kind of preparation method of air foam fracturing fluid

An air foam and fracturing fluid technology, applied in the field of preparation of air foam fracturing fluid, can solve the problems of high stability and low temperature resistance, and achieve the effects of improving temperature resistance, easy use and cost saving

Inactive Publication Date: 2017-03-29
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

[0043] Add 2 g of laponite to 300 mL of deionized water at 50° C., stir for 60 min, and disperse uniformly, then lower to room temperature, stand for 36 hours, and obtain an aqueous dispersion of laponite. Add 0.8g cetyltrimethylammonium bromide to the lithium soap right water dispersion, stir evenly for 12h, stand still for 6h, add 0.6g sodium lauryl alcohol polyoxyethylene ether sulfate, and then Stir on a high-speed emulsifier at 5000 rpm for 6 minutes to obtain an air foam fracturing fluid. The apparent viscosity at room temperature is 200mPa·s, the apparent viscosity at 90℃ is 50mPa·s, the foaming efficiency is 80%, the half-life is 100h, the settling time is 10h, the water gel breaking time is 30min, the foam fracturing fluid after water gel breaking The apparent viscosity is lower than 5mPa·s.

Embodiment 2

[0045] 9 g of laponite was added to 300 mL of deionized water at 90° C., stirred for 30 min, and dispersed uniformly, then lowered to room temperature, and allowed to stand and age for 48 hours to obtain an aqueous dispersion of laponite. Add 3.6g of octadecyltrimethylammonium bromide into the lithium soap right water dispersion, stir evenly for 24h, stand for 12h, add 1.5g of ammonium lauryl sulfate, and then use a high-speed emulsifier at 10000rpm Stir at the speed of 3min to obtain air foam fracturing fluid. The apparent viscosity at room temperature is 2000mPa·s, the apparent viscosity at 90°C is 400mPa·s, the foaming efficiency is 50%, the half-life is 768h, the settling time is 720h, the water gel breaking time is 60min, the foam fracturing fluid after water gel breaking The apparent viscosity is lower than 5mPa·s.

Embodiment 3

[0047] Add 3 g of laponite to 300 mL of deionized water at 60° C., stir for 50 min, and disperse uniformly, then lower to room temperature, and stand for aging for 38 hours to obtain an aqueous dispersion of laponite. Add 1.2g of cetyltriethylammonium bromide to the lithium soap right water dispersion, stir uniformly for 16h, stand for 8h, add 1.2g of sodium lauryl sulfate, and then use a high-speed emulsifier at 8000rpm Stir at the speed of 5min, then get the air foam fracturing fluid. The apparent viscosity at room temperature is 400mPa·s, the apparent viscosity at 90°C is 100mPa·s, the foaming efficiency is 100%, the half-life is 236h, the settling time is 90h, the water gel breaking time is 35min, the foam fracturing fluid after water gel breaking The 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

[0001] 1. Technical Field [0002] The invention relates to a preparation method of air foam fracturing fluid. The air foam fracturing fluid prepared by the invention is suitable for the exploration and development of conventional and unconventional oil and gas resources (coalbed methane, shale gas, shale oil, etc.). [0003] 2. Background technology [0004] Fracturing has been rapidly developed and widely used as the main increase in production and injection measures for oil and gas reservoirs. 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 fracturing fluids have been used in foreign countries since the late 1960s in o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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