Cyclic utilization and treatment method of fracturing backflow liquid

A fracturing flowback fluid and treatment method technology, applied in mining wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. The effect of reducing dosage, eliminating adverse effects, and wide sterilization range

Inactive Publication Date: 2017-05-31
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: The residual cross-linking agent cannot be completely masked, and a small amount of cross-linking agent still exerts cross-linking effect; The masking agent will mask the cross-linking agent added during construction, reduce the cross-linking effect, and even cause construction failure

Method used

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  • Cyclic utilization and treatment method of fracturing backflow liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: 300m of flowback fluid in Block Su 59 3 , the water quality is black and smelly, 170s -1 The lower initial viscosity is 7mPa·s. Add 0.45% microorganisms and let stand for 3 days, 170s -1 The lower initial viscosity is 1.2mPa·s; Add 0.15% high-efficiency fungicide into the reaction tank and stir for 20 minutes; Add 0.1% metal ion remover and stir for 5 minutes until pH = 8; Add 0.1% oxygen scavenger and stir for 10 minutes; Add 60ppm of flocculant and stir for 10 minutes, flocculate and settle for 25 minutes, the supernatant liquid is transferred to the clean water tank, the lower layer of flocculant liquid enters the filter press for filtration, and the filtrate is transferred to the clean water tank; Add 0.01% pH adjuster to the supernatant to inhibit cross-linking.

[0037]The microorganisms are obtained by mixing 40-50% of the fracturing flowback fluid, 35-45% of the guar gum solution, and 5-25% of domestic sewage; Methyl benzyl ammonium chlor...

Embodiment 2

[0039] Example 2: 500m of flowback fluid in Tao 7 block 3 , the water quality is black and smelly, 170s -1 The lower initial viscosity is 6mPa·s. Add 0.8% microorganisms and let stand for 2 days, 170s -1 The lower initial viscosity is 1mPa·s; Add 0.12% high-efficiency fungicide into the reaction tank and stir for 25 minutes; Add 0.05% metal ion remover, stir for 5 minutes, until pH = 8.5; Add 0.1% oxygen scavenger and stir for 5 minutes; Add 10ppm flocculant and stir for 15 minutes, flocculate and settle for 30 minutes, the supernatant liquid is transferred to the clean water tank, the lower layer flocculant is filtered into the filter press, and the filtrate is transferred to the clean water tank; Add 0.02% pH adjuster to the supernatant to inhibit cross-linking.

[0040] The microorganisms are obtained by culturing the fracturing flowback fluid, and the high-efficiency fungicide is composed of hydrogen peroxide and dodecyldimethylbenzyl ammonium chloride; hydroge...

Embodiment 3

[0042] Example 3: 430m of flowback fluid in Block Su 5 3 , the water quality is black, smelly and turbid, 170s -1 The lower initial viscosity is 8mPa·s. Add 0.1% microorganisms and let stand for 5 days, 170s -1 The lower initial viscosity is 1.1mPa·s; Add 0.3% high-efficiency fungicide into the reaction tank and stir for 15 minutes; Add 0.5% metal ion remover and stir for 10 minutes until pH = 9; Add 0.2% oxygen scavenger and stir for 10 minutes; Add 100ppm flocculant and stir for 15 minutes, flocculate and settle for 25 minutes, the supernatant liquid is transferred to the clean water tank, the lower layer flocculated liquid enters the filter press for filtration, and the filtrate is transferred to the clean water tank; Add 0.03% pH adjuster to the supernatant to inhibit cross-linking.

[0043] Described microorganism is cultivated after mixing 50% of guar gum solution and 50% of river water, and described high-efficiency bactericide is made up of hydrogen peroxid...

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Abstract

The invention discloses a cyclic utilization and treatment method of fracturing backflow liquid, relates to the technical field of fracturing reformation of oil and gas reservoirs and in particular relates to the cyclic utilization and treatment method of the fracturing backflow liquid. The cyclic utilization and treatment method comprises the following steps: removing macromolecular organic matters by utilizing microorganisms, so as to reduced COD (Chemical Oxygen Demand); adding efficient fungicide and killing bacteria in the backflow liquid; adding a metal ion removing agent, and removing divalent and trivalent metal ions in the backflow liquid; adding a deoxidant to remove residual gel breaking agent in the backflow liquid; adding a flocculating agent and carrying out flocculation and sedimentation; transferring supernatant into a clean water tank and enabling lower-layer flocculating liquid to enter a pressure filter for filtering; transferring filtrate into the clean water tank; adding a pH (Potential of Hydrogen) regulator, and inhibiting cross-linking effect of residual cross-linking agent. The method has the advantages of simple process, convenience for operation, high treatment efficiency, low cost, high field applicability and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir fracturing reconstruction, and relates to a treatment method for fracturing flowback fluid, which is suitable for recycling and reuse of fracturing flowback fluid in oil and gas fields. Background technique [0002] Hydraulic fracturing is the main means of oil and gas reservoir reconstruction. The fracturing construction consumes a lot of clean water, and a large amount of flowback fluid will be produced after fracturing, which not only causes waste of water resources, but also causes serious environmental pollution. Therefore, the recycling of fracturing flowback fluid is of great significance and is imminent for green production and sustainable development. [0003] After the fracturing fluid breaks the gel, the molecular structure of the vegetable glue in it is destroyed, it cannot be sticky or cross-linked, and cannot be directly reused. Fracturing flowback fluid has the charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F1/50C02F1/5245C02F1/56C02F1/722C02F3/34C02F9/00C02F2103/10C02F2301/08C02F2305/06
Inventor 张晓虎管彬黄伟陈英李旭春李现东杨南鹏廖阔欧治林陈绍宁于世虎李倚云周怡李磬吴安林寇双锋
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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