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Two-stage fine filter device and two-stage fine filter method for fracturing flow-back fluid

A fracturing flowback fluid and fine filtration technology, which is applied in the direction of filtration circuit, filtration separation, separation device, etc., can solve the problems of high cost, complex process, difficult treatment, etc., and achieve convenient maintenance, short process flow and stable operation sex high effect

Inactive Publication Date: 2016-03-23
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

[0005] In order to overcome the existing problems of difficult treatment of fracturing flowback fluid, complex process and high cost, the present invention provides a fine filtration device and method for oil and gas well fracturing flowback fluid. For the recyclable fracturing fluid, after fine After filtration, the content of suspended solids can be effectively reduced, which can meet the water quality requirements for repeated configuration of fracturing fluid; for non-recyclable fracturing fluid, fine filtration can be used for follow-up treatment after removing suspended impurities

Method used

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  • Two-stage fine filter device and two-stage fine filter method for fracturing flow-back fluid
  • Two-stage fine filter device and two-stage fine filter method for fracturing flow-back fluid
  • Two-stage fine filter device and two-stage fine filter method for fracturing flow-back fluid

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Embodiment 1

[0030] In order to overcome the existing problems of difficult treatment of fracturing flowback fluid, complicated process and high cost, the present invention provides such as figure 1 , figure 2 , image 3 , Figure 4 The device and method for the fine filtration of oil and gas well fracturing flowback fluid are shown. For the recyclable fracturing fluid, after fine filtration, the content of suspended solids can be effectively reduced, and the water quality requirements for repeated configuration of fracturing fluid can be met; Fracturing fluid that cannot be recycled can be processed after fine filtration to remove suspended impurities.

[0031] A fine filtration device for fracturing flowback fluid, comprising a liquid storage tank 1, a lift pump 2, a primary filter 3, two secondary filters 4 arranged in parallel, and a storage tank 5, the liquid storage tank 1 and the lift pump 2 The water suction pipe of the lift pump 2 is connected to the water inlet pipe at the up...

Embodiment 2

[0035] On the basis of Embodiment 1, in the present embodiment, the primary filter 3 is provided with a primary filter screen 9, and the primary filter screen 9 adopts a metal cylindrical filter screen with a filtration accuracy of 50- 100 μm.

[0036] The primary filter 3 is a motor steel brush filter, and a stainless steel brush 6 is arranged in the filter screen 9 of the primary filter.

[0037] The secondary filter 4 is provided with a secondary filter screen 10 with a filtration accuracy of 0.5-20 μm.

[0038] The secondary filter 4 is a multi-bag filter, and filter bags 7 are arranged in the filter screen 10 of the secondary filter.

[0039] The filter bag 7 is a filter bag of polypropylene, polyester or PTFE polytetrafluoroethylene.

[0040] Both the primary filter 3 and the secondary filter 4 are installed vertically.

[0041] The first-stage filter is installed vertically, the water inlet pipe of the first-stage filter is located at the upper part, and the water ou...

Embodiment 3

[0047]Based on the above embodiments, in this embodiment, a method for finely filtering fracturing flowback fluid includes the following steps:

[0048] Step 1: After desanding, the fracturing flowback fluid enters the liquid storage tank 1, and the fracturing flowback fluid stored in the liquid storage tank 1 enters the primary filter 3 under the action of the lift pump 2;

[0049] Step 2: Preliminarily filter the fracturing flowback fluid through the primary filter 3 to filter out large particles in the water, and then enter the secondary filter 4 from the primary filter 3;

[0050] Step 3: Filter the fracturing flowback fluid again through the secondary filter 4 to remove suspended matter and colloids in the water, and then enter the storage tank 5 .

[0051] The large particulate matter in the step 2 refers to particles with a particle size greater than 50 μm; the suspended solids and colloids in the step 3 have a particle size greater than 0.5 μm.

[0052] The steps 2 an...

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Abstract

The invention provides a two-stage fine filter device for fracturing flow-back fluids. The device includes a liquid storage tank, a lifting pump, a primary filter, and two secondary filters arranged in parallel. The liquid storage tank is connected to a water suction pipe of the lifting pump. A water outlet pipe of the lifting pump is connected to a water inlet pipe of the primary filter. The water outlet pipe of the primary filter is respectively connected to the water inlet pipes of the two secondary filters. The water outlet pipes of the two secondary filters are connected to the liquid storage tank. When the fracturing flow-back fluid is subjected to filtration in two precision stages, suspension solids in the fracturing flow-back fluid are effectively removed. For recyclable fracturing fluids, when being finely filtered, the fracturing fluids can be regenerated and reuse. For non-recyclable fracturing fluids, when being subjected to fine filtration to remove the suspension solids, the fracturing fluids can be sent to subsequent treatment. The device is large in filtration area and high in treatment efficiency and filtering precision, is simple in operation, is convenient to repair, and solves the technical problem that the fracturing flow-back fluids are difficult to recycle since content of the suspension solids is high in the fracturing flow-back fluids.

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] The hydraulic fracturing process is an important technical process to improve the productivity of oil and gas wells. With the development of low-permeability tight reservoirs and unconventional gas reservoirs, the number of horizontal wells has increased year by year. It is getting bigger and bigger, which directly leads to an increase in the amount of flowback fracturing fluid after fracturing. Since the fracturing flowback fluid contains a large number of chemical components (such as various organic components, fungicides, drainage aids, cross-linking agents, gel breakers, etc.), direct discharge will affect the environment, and the treatment is difficult if it meets the discharge standard. Large, complicated process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D36/02C02F1/00C02F103/10
CPCB01D36/02B01D2221/04C02F1/001C02F2103/10C02F2301/08
Inventor 杨博丽徐迎新张冕陈文博姚兰景志明郭伟林马新东高银锁
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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