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A treatment method and system for drilling and fracturing flowback fluid in oil and gas fields

A technology for fracturing flowback fluid and treatment methods, which is applied to chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to prolong the cleaning cycle, reduce the amount of gel breaker, and improve the breaking efficiency. The effect of glue efficiency

Active Publication Date: 2019-04-30
北京丰得源水务科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve some of the problems existing in the existing environmental protection sewage treatment technology, and to provide a treatment method and system for drilling and fracturing flowback fluid in oil and gas fields

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  • A treatment method and system for drilling and fracturing flowback fluid in oil and gas fields
  • A treatment method and system for drilling and fracturing flowback fluid in oil and gas fields

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Embodiment Construction

[0030] In order to better explain the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Such as figure 1 , 2 As shown, an oil and gas field drilling and fracturing flowback fluid processing method and system includes the following steps:

[0032] Step 1. Pre-acidified polyhydroxyl autooxidation: the fracturing flowback liquid is lifted by the material transfer pump 1 to the tubular reactor 2 and fully mixed with the acid liquid entering from the inlet 21. The fluid velocity in the tubular reactor 2 Gradient at 720s -1 At the end of the tubular reactor 2, an online pH meter 19 monitors the pH value of the waste fracturing flowback fluid, and feeds back the monitored signal to the acid supply pump 142 to control the flow rate. The pH-adjusted fracturing flowback fluid enters the polyhydroxy autoxidation react...

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Abstract

The invention provides a treatment method for well drilling backflow fracturing fluid of an oil and gas field. The treatment method comprises the following steps that firstly, waste backflow fracturing fluid is mixed with acid liquid in a tubular reactor, then, the mixture enters a polyhydroxy self-oxidation reaction pry to make contact with a polyhydroxy self-oxidation carrier; secondly, the waste backflow fracturing fluid discharged from the polyhydroxy self-oxidation reaction pry enters a coagulation gel breaking pry to be mixed with coagulant and gel breaker, then, a flocculating agent is added into the mixed liquid, and stirring continues to be carried out; thirdly, solid-liquid separation is carried out on the waste backflow fracturing fluid in the second step, and discharged sludge is subjected to solidification; fourthly, a micro-nano bubble generation pump is used for mixing the liquid in the third step and an ozone oxidizing agent and then feeding the mixture into a micro-nano ozone oxidation pry to be oxidized; fifthly, oxidized liquid enters ultrafiltration, ultrafiltration concentrated water is returned to the micro-nano ozone oxidation pry, filtrate is subjected to low-pressure reverse osmosis, concentrated water obtained after reverse osmosis is used as make-up water for sludge solidification, and clear water is discharged. By means of the treatment method, the process procedures are simplified, and the treatment expenditure is reduced.

Description

Technical field [0001] The invention relates to the technical field of treatment of drilling fracturing flowback fluid with environmentally friendly high salt and high polymer concentration, and in particular to a method and system for processing oil and gas field drilling fracturing flowback fluid. Background technique [0002] At present, with the development of oil and gas resources, huge pressure has been put on the local ecological environment. Not only are local groundwater resources used extensively, but also a large amount of untreated or untreated drilling fluids and drilling fluids are discharged during operation. The pollution caused by the discharge of debris, mud, and waste fracturing fluid into the surrounding environment will severely restrict the sustainable development of my country's drilling industry. The salient features of fracturing flowback fluid are high salt, high SS (suspended matter), high COD (chemical oxygen demand), and high concentration of organic m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张兆昌叶明
Owner 北京丰得源水务科技有限公司
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