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Method for centralized treatment and comprehensive utilization of foam drainage during gas production in oil-gas fields

A centralized treatment, oil and gas field technology, applied in mining wastewater treatment, degassed water/sewage treatment, water/sewage treatment, etc., can solve problems such as the inability to achieve effective operation of evaporation devices, and achieve stable discharge standards and comprehensive effects of pollutants

Pending Publication Date: 2018-11-30
PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the addition of foaming agent, bubble drainage has the stubbornness of foaming, and the content of COD, mineral oil, ammonia nitrogen, salinity, calcium and magnesium in bubble drainage is high, and due to foaming, the wastewater cannot realize the effective operation of the evaporation device

Method used

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  • Method for centralized treatment and comprehensive utilization of foam drainage during gas production in oil-gas fields

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment takes the application of air bubble drainage treatment in the exploration and development production of West Sichuan Gas Field of Sinopec Southwest Oil and Gas Branch Company as a specific example to specifically illustrate the method of the present invention for centralized treatment and comprehensive utilization of air bubble drainage in oil and gas field production.

[0037] In 2016, Sinopec Southwest Oil and Gas Company used this method to implement daily production of 400m in Sichuan Chuanxi Gas Field Exploration and Development Production Bubble Drainage 3 The specific operation steps of operation project, centralized processing and comprehensive utilization are as follows:

[0038] a. Centrally transport and collect the air bubble drainage produced in the single well gas production process to the receiving settlement oil trap, and recover the free oil obtained from the upper part by gravity separation into the 100m 3 Storage in the waste oil recov...

Embodiment 2

[0047] This embodiment takes the application of fracturing flowback fluid treatment by the downhole operation company of Sinopec Southwest Petroleum Engineering Company as a specific example to specifically illustrate the method of the present invention for centralized treatment and comprehensive utilization of air bubble drainage in oil and gas fields. The specific operation process is as follows:

[0048] a. Collect the fracturing flowback fluid generated during the acidizing and fracturing operation of drilling and collect it in the receiving and settling grease trap, and recover the free oil obtained from the upper part by gravity separation into the waste oil recovery tank for storage; after separation, the suspended solids settle The solid phase sludge is obtained at the bottom of the grease trap, and the solid sludge is sent to the sludge dewatering system through the sludge collection system and sludge pump for treatment; the initial degreasing and fracturing flowback f...

Embodiment 3

[0056] This example takes Sinopec Inner Mongolia Wushen Banner drilling waste press filter water treatment application as a specific example to specifically illustrate the method of the present invention for centralized treatment and comprehensive utilization of air bubble drainage in oil and gas fields. The specific operation process is as follows:

[0057]a. Collect the filter press water produced by the solid-liquid separation of drilling waste into the receiving settling tank for gravity separation. After separation, part of the suspended solids settles to the bottom of the settling tank to obtain solid phase sludge. The solid sludge passes through the sludge collection system and The sludge is pumped into the sludge dewatering system for treatment; after settling, the press-filtered water enters the coagulation air flotation device;

[0058] b. Lift the filtered water obtained in step a into the coagulation and air flotation device through the sewage pump, and add aluminu...

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Abstract

The invention discloses a method for centralized treatment and comprehensive utilization of foam drainage during gas production in oil-gas fields. The method comprises the steps: firstly, collecting the drainage into a grease trap for treatment so as to obtain solid sludge and preliminarily-treated drainage; and conveying the treated drainage to a coagulation air-floatation degreasing device, andperforming aeration and degreasing treatment so as to obtain solid sludge and secondarily-treated drainage; conveying the obtained drainage to an iron-carbon micro-electrolysis device, performing a micro-electrolysis reaction so as to obtain sludge after the reaction treatment is conducted, conveying the obtained drainage to a softening reaction sedimentation tank, performing softening hardness removal treatment, performing settlement to obtain sludge, conveying the obtained drainage to a water softening pool for softening treatment so as to obtain qualified softened water, and conveying the obtained qualified softened water into a water purification pool, wherein the obtained qualified water can be directly applied to re-injection or multi-effect evaporation treatment and is subjected toup-to-standard discharge; and performing centralized treatment and recovery on the sludge obtained in the steps. Grease and salts in the foam drainage wastewater during gas production can be recoveredfully, the foam drainage obtained after the centralized treatment is conducted can be introduced into an evaporation system for evaporation treatment, and the obtained drainage is subjected to up-to-standard discharge and can be utilized comprehensively as oilfield re-injection water, so that resource utilization is achieved.

Description

1. Technical field: [0001] The invention belongs to the technical field of centralized treatment and comprehensive utilization of air bubble drainage in oil and gas fields, and in particular relates to a process method for centralized treatment and comprehensive utilization of air bubble drainage in oil and gas fields. 2. Background technology: [0002] With the continuous development of gas fields and the improvement of reserves production, the water production of gas reservoirs and the number of water production wells are increasing, and problems such as fluid accumulation in wellbore and water production of gas wells affecting normal production have gradually emerged. Fluid accumulation in the wellbore will increase the back pressure on the gas layer and limit the production capacity of the well. If the fluid accumulation in the wellbore is too large, the gas well will stop blowing completely. In addition, the liquid column in the wellbore will damage the formation near t...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/10
CPCC02F1/001C02F1/048C02F1/20C02F1/24C02F1/40C02F1/46176C02F1/52C02F1/5245C02F1/66C02F5/02C02F5/06C02F9/00C02F11/121C02F11/14C02F2103/10C02F2301/046
Inventor 郭敏唐建郭学峰王晓红吴振峰鲁书成姬生伟李晔孙强杨静文田铭瑶陈琦
Owner PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD
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