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Fracturing backflow liquid finely-filtering device and method

A fracturing flowback fluid and fine filtration technology, which is applied in the direction of filtration separation, separation method, filtration circuit, etc., can solve the problems of high COD, high viscosity, impact on the environment, etc., and achieve high pollution holding capacity, short process flow, high efficiency effect

Inactive Publication Date: 2015-08-12
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fracturing flowback fluid contains a large amount of chemical agents and soluble salts (mainly fracturing additives, formation ions, etc.), as well as mechanical impurities, a small amount of oil, etc., resulting in high COD of the fracturing flowback gel-breaking waste fluid , high viscosity and high stability, direct efflux will affect the environment

Method used

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  • Fracturing backflow liquid finely-filtering device and method
  • Fracturing backflow liquid finely-filtering device and method
  • Fracturing backflow liquid finely-filtering device and method

Examples

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Embodiment 1

[0034] This embodiment provides a fine filtration device for fracturing flowback fluid, combining figure 1 , figure 2 and image 3 , including a liquid storage tank 1, a lifting pump 2, a primary filter 3, two secondary filters 4 arranged in parallel and a storage tank 5, the liquid storage tank 1 is connected with the suction pipe of the lifting pump 2, and the outlet of the lifting pump 2 The water pipe is connected to the water inlet pipe of the primary filter 3, the water outlet pipe of the primary filter 3 is respectively connected to the water inlet pipes of two secondary filters 4, and the water outlet pipe of the secondary filter 4 is connected to the storage tank 5;

[0035] The first-stage filter 3 adopts vertical installation, the water inlet pipe of the first-stage filter 3 is located at the upper part, and the water outlet pipe is located at the lower part; the second-stage filter 4 adopts horizontal installation.

[0036] After the fracturing flowback fluid is...

Embodiment 2

[0039] On the basis of Embodiment 1, this embodiment further includes that the primary filter screen 9 in the primary filter 3 adopts a metal cylindrical filter screen with a filtration accuracy of 100-200 μm.

[0040] Such as Figure 4 As shown, the first-stage filter 3 is a motor steel brush filter, and a stainless steel brush 6 is arranged in the filter screen 9 of the first-stage filter, and the stainless steel brush 6 is driven by the motor to rotate.

[0041] The primary filter 3 adopts metal filter screen, which has high mechanical strength and durability, and the filtration accuracy is 100-200 μm. It mainly removes the larger particles in the flowback liquid. The filter will start the self-cleaning process, the stainless steel brush 6 in the motor filter will rotate, and the filter cake on the primary filter screen 9 will be brushed off by the steel brush and discharged from the drain valve.

Embodiment 3

[0043] On the basis of Embodiment 1, in this embodiment, the secondary filter screen 10 in the secondary filter 4 adopts a metal cylindrical filter screen, and the filtration accuracy is 10-20 μm.

[0044] Such as Figure 5 As shown, the secondary filter 4 is a motor suction filter, the secondary filter screen 10 is provided with a suction scanner 7, the motor drives the suction scanner 7 to work, and the suction nozzle of the suction scanner 7 11 Suck suspended particles.

[0045] The secondary filter 4 also adopts a metal filter screen with a filtration accuracy of 10-20 μm, mainly to remove finer suspended particles in the flowback liquid, and adopts pressure difference to control the cleaning process, and the motor drives the sucking scanner 7 of the filter; The internal spiral movement of the secondary filter screen 10, the filter cake is sucked and discharged from the drain valve.

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Abstract

The invention relates to a fracturing backflow liquid finely-filtering device and method. The device comprises a liquid storage tank, a lifting pump, a primary filter, two parallelly-arranged secondary filters, and a storage tank; the liquid storage tank is connected to the water suction pipe of the lifting pump, the water discharge pipe of the lifting pump is connected to the water inlet pipe of the primary filter, the water discharge pipes of the primary filter are respectively connected to the water inlet pipes of two secondary filters, and the water discharge pipes of the secondary filters are connected to the storage tank. The primary filter is arranged vertically, the secondary filters are horizontally arranged, the water inlet pipe of the primary filter is arranged on the upper part, and the water discharge pipe is arranged on the lower part. The filter device is used to finely filter the recyclable fracturing liquid, after the fine filtration, the fracturing liquid can be reused and applied to liquid preparation; and the fracturing liquid which cannot be recycled, can be applied to a post treatment after the suspended impurities are removed by the fine filtration. The provided filter device and method have the advantages that the filter area is large, the processing efficiency is high, the operation is simple and convenient, the maintenance is convenient, and solved is the technical problem that the recovery is difficult due to the high content of suspended impurities in the fracturing backflow liquid.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field operation waste fluid treatment technology, and in particular relates to a fine filtration device and method for fracturing flowback fluid. Background technique [0002] Downhole operation is an important link in the process of oilfield development. In recent years, foreign tight oil and gas reservoirs have been effectively developed, in which the new fracturing stimulation technology has played a vital role. [0003] Volume fracturing is one of the key technologies for increasing production of tight oil reservoirs, and it has the characteristics of large fluid volume, and the volume of fluid entering the ground in a single layer can reach 1,000 to 1,500 , the amount of single-layer flowback liquid can reach 800-1200 . However, the fracturing flowback fluid contains a large amount of chemical agents and soluble salts (mainly fracturing additives, formation ions, etc.), as well as me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D36/02
Inventor 徐迎新杨博丽张冕姚兰陈文博马新东李启新杨德勇陈炜景志明
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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