Reutilization method of water-base fracturing flowback fluid

A fracturing flowback fluid and water-based fracturing technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as water quality reuse, improve recovery rate, expand Use range, effect of expanding the range of recycling

Inactive Publication Date: 2015-01-28
CHINA PETROCHEMICAL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the existing technology is only limited to the reuse of slick water fracturing flowback fluid, and at the same time solve t

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  • Reutilization method of water-base fracturing flowback fluid
  • Reutilization method of water-base fracturing flowback fluid

Examples

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Embodiment 1

[0025] Oil-water separation was performed on the flowback fluid of an unconventional oil well fracturing (fracturing stage 10) in a tight sandstone reservoir in Zhongyuan Oilfield, and 10m of the separated effluent was taken 3 , to analyze the nature of pollutants, the suspended matter is 1351mg / L, the oil content is 132mg / L, the total iron is 26.4mg / L, the COD is 2861.2mg / L, the hardness is 3624mg / L, and the boron content is 18.36mg / L. Adjust the pH of the water sample to 10 and then pump it into the ozone oxidation reactor. The ozone concentration is 30-40 mg / L. After 30 minutes of reaction, the wastewater is treated with flocculation and sedimentation; add 5 kg / m 3 Add the precipitating agent after dissolving completely (1.3 times of calcium ion stoichiometric reaction measure add sodium carbonate, magnesium ion stoichiometric reaction measure 1.0 times add sodium hydroxide) and stir evenly, white precipitate appears, add under slow speed stirring The polyacrylamide solutio...

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Abstract

The invention relates to a reutilization method of a water-base fracturing flowback fluid, and belongs to the field of cyclic utilization technologies for water-base fracturing flowback fluids generated in non-routine oil and gas reservoir resource exploitation, especially wastewater reuse processing technologies of oil and gas fields. A mixed waste liquid of the water-base fracturing flowback fluid is subjected to ozone oxidation, flocculation precipitation processing and filter adsorption processing for removing harmful compositions in the wastewater, and the discharged water can be used to prepare slick water normally used in unconventional oil and gas wells, linear glue and gelling fracturing fluids. The method is simple in technology, continuous in operation, rapid and efficient, and helps to realize repeated reuse of fracturing flowback fluids and save water resource.

Description

technical field [0001] The invention relates to a method for reusing water-based fracturing flowback fluid, which is a recycling technology for mixed waste liquid of water-based fracturing flowback fluid produced in the exploitation of unconventional oil and gas reservoir resources, and belongs to the reuse treatment of wastewater in oil and gas fields technology field. Background technique [0002] Fracturing is one of the important measures for oil and gas well stimulation. The fracturing fluids are generally divided into three categories: water-based, oil-based and multiphase fracturing fluids. Water-based fracturing fluids are the most commonly used. The fracturing of unconventional oil and gas reservoirs is quite different from the fracturing of conventional oil and gas wells. The main reason is that horizontal wells generally adopt a multi-stage segmented, high displacement and super large fluid volume fracturing mode, so single well fracturing flowback fluid The flui...

Claims

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Application Information

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IPC IPC(8): C02F9/04C09K8/68
CPCC02F1/28C02F1/52C02F1/78C02F9/00C09K8/68C09K8/685C09K8/882C09K2208/12
Inventor 张淑侠何焕杰吕宁超肖兵张晓刚张高群
Owner CHINA PETROCHEMICAL CORP
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