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CN-122012064-A - Sophorolipid composition for slickwater fracturing fluid, and preparation method and application thereof

CN122012064ACN 122012064 ACN122012064 ACN 122012064ACN-122012064-A

Abstract

The invention discloses a sophorolipid composition for a slickwater fracturing fluid, and a preparation method and application thereof, and relates to the technical field of slickwater fracturing fluids. The sophorolipid composition for the slick water fracturing fluid mainly comprises sophorolipid obtained by fermentation production of candida bumblebee (Candida bombicola), and further comprises a thickening agent, a drag reducer and a clay stabilizer. The slickwater fracturing fluid disclosed by the invention is simple in preparation method and low in use cost, and the main active components are biological sources, and the drag reduction, temperature resistance and salt resistance, the emulsifying activity and the environmental protection requirements are considered, so that the drag reduction rate is improved, the recovery ratio is improved, and the slickwater fracturing fluid has a wide application prospect in hydraulic fracturing of oil fields.

Inventors

  • SU DONGLIANG
  • CHEN GUANG
  • Gong Qiuyu
  • TONY DAVID JAMES
  • AN SHI
  • MA HONGXUE
  • CHEN BINGZHU

Assignees

  • 伊明泰(山东)生物科技有限公司
  • 济南佰赛菲生物科技有限公司

Dates

Publication Date
20260512
Application Date
20260119

Claims (12)

  1. 1. A sophorolipid composition for a slick water fracturing fluid is characterized in that main active ingredients of the composition are sophorolipid, the concentration of the sophorolipid is more than or equal to 0.03wt%, the sophorolipid is a product obtained by fermentation production of bumblebee candida (Candida bombicola), the content of lactone type sophorolipid is more than or equal to 80 percent (the content of acid type sophorolipid is 16 percent and the content of internal fat type sophorolipid is 84 percent), and the sophorolipid composition also comprises a thickening agent, a drag reducer and a clay stabilizer.
  2. 2. The sophorolipid composition for slickwater fracturing fluid according to claim 1, which is characterized by comprising the following raw materials, by mass, 0.05-0.3% of sophorolipid, 0.05-0.25% of a thickening agent, 0.1-0.25% of a drag reducer, 0.5-2.0% of a clay stabilizer and the balance of water.
  3. 3. The sophorolipid composition for slickwater fracturing fluid according to claim 1, wherein the sophorolipid composition is in a liquid form and the pH value is adjusted to 7.5-9.5.
  4. 4. A sophorolipid composition for a slickwater fracturing fluid according to claim 1 to 3, wherein said composition is an aqueous solution containing sophorolipid, a thickener, a drag reducer and a clay stabilizer, or a liquid prepared by adding a thickener, a drag reducer and a clay stabilizer to a supernatant of sophorolipid fermentation, or a dilution of said liquid.
  5. 5. The sophorolipid composition for slickwater fracturing fluid according to claim 1-2, wherein the thickener is one or more of xanthan gum, sodium carboxymethylcellulose and sodium alginate.
  6. 6. The sophorolipid composition for slickwater fracturing fluid according to claim 1-2, wherein the drag reducer in the composition is one or more of sodium dodecyl benzene sulfonate, polyethylene oxide and tween 80.
  7. 7. The sophorolipid composition for slickwater fracturing fluid according to claim 1-2, wherein the clay stabilizer in the composition is one or two of potassium chloride and ammonium chloride.
  8. 8. A sophorolipid composition for slickwater fracturing fluid according to claim 2, wherein the surface tension of the composition is less than or equal to 30 mN/m and the interfacial tension is less than or equal to 3 mN/m.
  9. 9. The sophorolipid composition for slickwater fracturing fluid according to claim 2, wherein the viscosity of the composition is 15-50 mPa.s, and the kinematic viscosity is less than or equal to 10mm 2 /s.
  10. 10. The sophorolipid composition for slickwater fracturing fluid according to claim 2, wherein the resistivity of the composition is not less than 60%.
  11. 11. A method for preparing a sophorolipid composition for a slickwater fracturing fluid according to claim 1-4 is characterized by comprising the steps of (1) fermenting a bumblebee candida (Candida bombicola) to produce sophorolipid to obtain a sophorolipid-containing fermentation fluid, (2) removing insoluble substances such as thalli, residual grease and the like in the fermentation fluid to obtain a sophorolipid fermentation supernatant, or removing insoluble substances such as thalli, residual grease and the like in the fermentation fluid, further removing impurities through acid precipitation alkali dissolution treatment to obtain a sophorolipid extract, (3) diluting the fermentation supernatant with water to the required sophorolipid concentration, adding a thickener, a drag reducer and a clay stabilizer according to the amount, stirring, dissolving and mixing to obtain the sophorolipid composition, or weighing the sophorolipid extract, the thickener, the drag reducer and the clay stabilizer according to the amount, adding water, stirring, dissolving and mixing to obtain the sophorolipid composition.
  12. 12. Use of a sophorolipid composition according to claim 1 as a slickwater fracturing fluid in hydraulic fracturing of oil fields.

Description

Sophorolipid composition for slickwater fracturing fluid, and preparation method and application thereof Technical Field The invention relates to the technical field of slickwater fracturing fluid, in particular to a sophorolipid composition for the slickwater fracturing fluid, a preparation method and application thereof. Background The recoverable amount of ‌ traditional oil and gas resources is gradually reduced, and the recovery difficulty is also continuously increased. The unconventional oil gas resources represented by shale oil gas in China are rich. It is predicted that the unconventional oil gas becomes the most strategic and realistic oil gas succession resource in China after 2050. Along with the increase of energy demand, the development of reinforcing unconventional oil and gas resources has important significance for stabilizing energy supply basis and guaranteeing energy safety. Compared with the conventional oil reservoir, the unconventional oil and gas reservoir has the characteristics of low permeability, low porosity, complex geological structure and the like, and is difficult to be mined by effectively utilizing the conventional technical means. To enhance recovery, fracturing technology is one of the key technologies for unconventional oil and gas field development. The basic principle of the fracturing technology is that a fracturing fluid is injected into an oil-gas reservoir by utilizing high pressure, the oil-gas reservoir is transformed by fracturing, so that the reservoir rock is broken to form a fracture network, an oil-gas circulation channel is increased, the oil-gas seepage capability is improved, and the oil-gas resource exploitation efficiency is further improved. For fracturing construction, the fracturing fluid is a key to achieving fracturing. Water-based fracturing fluids predominate in fracturing fluid systems. At present, a guanidine gum fracturing fluid system is commonly used for hydraulic fracturing, and the guanidine gum system has the problems of complex construction process, long fluid preparation time, raw material waste, incomplete gel breaking and the like. Slickwater fracturing fluid (SLIPPERY WATER Fracturing Fluid) is a novel fracturing fluid system for hydraulic fracturing of unconventional oil and gas reservoirs at present. Slickwater fracturing fluids have lower viscosity than conventional fracturing fluids, which helps reduce frictional losses from fluid injection and reduces equipment wear, as well as facilitating efficient transfer of fluids. The slickwater fracturing fluid is large in fracturing construction scale, large in liquid amount and high in discharge capacity, and has low pumping friction resistance, low use cost and environment friendliness. More than 97% of the slick water fracturing fluid system is water, and the chemical additives mainly comprise a drag reducer (resistance reducing agent), a bactericide, a clay stabilizer, a surfactant and the like. The polyacrylamide becomes a main flow resistance reducing agent for domestic and foreign slickwater due to low price and good resistance reducing effect, but the salt tolerance of the polyacrylamide slickwater is poor, so that the fracturing performance is unstable, the better recovery efficiency is difficult to ensure, and in addition, the polyacrylamide has great harm to the environment and is unfavorable for the green development of oil fields. The use of biodegradable agents instead of or in addition to chemical additives can reduce the environmental impact of slickwater fracturing fluids. At present, the slick water fracturing fluid is limited by a plurality of factors such as drag reduction effect, temperature resistance and salt tolerance, economic benefit, environmental protection requirement and the like, and the slick water fracturing fluid which can take the drag reduction, the temperature resistance and salt tolerance and the economic environmental protection into consideration needs to be developed. Along with the progress of technology, the development of more environment-friendly and efficient additives is enhanced, and the economic benefit and the environmental benefit of the slickwater fracturing fluid are improved while the performance of the slickwater fracturing fluid is improved. The biosurfactant can change physical properties of the reservoir, reduce the interfacial tension of oil/water, emulsify crude oil and improve the mobility of the crude oil in the reservoir. The compound research of the biosurfactant and other fracturing agents is developed, the organic combination of the biosurfactant and the fracturing technology is explored, and the long-term stable yield and recovery ratio improvement of oil field development are hopeful to be realized. The sophorolipid is a glycolipid biosurfactant produced by fermenting saccharomycetes, and has high yield and relatively low production cost. Compared with the traditional chemical surfactant, the sophorolipid has the advant