CN212076656U

CN212076656U - Flowing back processing apparatus is returned to portable fracturing

Info

Publication number: CN212076656U
Application number: CN202020239498.8U
Authority: CN
Inventors: 崔灏; 崔锡平
Original assignee: Jiangsu Haoyi Environmental Protection Technology Co ltd
Current assignee: Jiangsu Haoyi Environmental Protection Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-12-04
Anticipated expiration: 2030-03-03

Abstract

The movable fracturing flow-back fluid treatment device comprises a waste fluid tank, a water diversion device, a coagulation reactor, a primary pretreatment device, a secondary pretreatment device, an intermediate water tank, a primary fine filter, a secondary fine filter and a clear water tank; the waste liquid tank is communicated with a water diversion device through a water absorption pipeline, the water diversion device is connected with a coagulation reactor through a pipeline, and a raw water pressure pump and a pipeline mixer are sequentially arranged on the pipeline connecting the water diversion device and the coagulation reactor; the coagulation reactor is respectively connected with the primary pretreatment device and the secondary pretreatment device through pipelines; the primary pretreatment device and the secondary pretreatment device are respectively connected with the intermediate water tank through pipelines; the middle water tank is respectively communicated with the bottom of the first-stage fine filter and the bottom of the second-stage fine filter through pipelines, and a middle pressure pump is arranged on the pipeline of the middle water tank communicated with the first-stage fine filter and the second-stage fine filter; the upper part of the first-stage fine filter and the upper part of the second-stage fine filter are respectively communicated with a clear water tank through pipelines.

Description

Flowing back processing apparatus is returned to portable fracturing

Technical Field

The invention relates to the field of oil and gas field sewage treatment, in particular to a mobile fracturing flow-back fluid treatment device.

Background

The fracturing operation is a main means for developing low-permeability oil reservoirs and unconventional oil and gas reservoirs, the permeability of the oil and gas reservoirs can be improved and blockage can be removed through fracturing, and the fracturing technology plays an important role in oil well potential digging of old areas, oil testing of new wells, single well yield increasing, unconventional oil and gas development and shale gas development. The fracturing fluid is injected into the formation under high pressure to enlarge the fractures of the formation and create new fractures, and proppant is filled to improve the permeability of the formation. The function of the fracturing fluid is to transmit pressure, form formation fractures, and carry proppant into the fractures. The fracturing fluid is a heterogeneous unstable chemical system formed by a plurality of additives according to a certain proportion, and is divided into water-based fracturing fluid, oil-based fracturing fluid, emulsified fracturing fluid, foam fracturing fluid, surfactant micelle fracturing fluid and the like according to the chemical properties of a prepared material and the final properties of the system. Since one of the main functions of the fracturing fluid is to carry the proppant from the wellbore to the intended location in front of the fracture via the perforations, the suspending and carrying (sand fracturing, etc.) capability of the fracturing fluid is a fundamental requirement, and the fracturing fluid must have a relatively high viscosity.

The fracturing flow-back fluid is complex in composition and contains various pollutants, the fracturing flow-back fluid mainly refers to residual fracturing fluid which is discharged from an oil-gas well after fracturing construction, the components mainly comprise fracturing raw glue liquid and gel breaking flow-back fluid, and the fracturing flow-back fluid contains guanidine gum, formaldehyde, petroleum and other various additives and the like, and the fracturing flow-back fluid has the characteristics of complex pollutant components, high sand content, high viscosity, high COD concentration and the like. The compositions of different systems and different types of fracturing flowback fluids are greatly different and are multiphase mixtures, and the composition of high molecular weight (the molecular weight is from hundreds of thousands to millions) organic matters is complex, so the treatment difficulty is high.

If the fracturing flowback liquid is directly discharged, the peripheral soil, vegetation, surface water and underground water are affected to a certain extent, so that the fracturing flowback liquid needs to be effectively treated before being discharged. Due to the high viscosity characteristics of the frac flowback fluid, it does not degrade in high temperature, high pressure formations for extended periods of time. In the related technology, a large amount of strong acid agents are usually used for degrading the fracturing flow-back fluid to reduce the viscosity of the fracturing flow-back fluid, and the degradation mode is adopted, so that the production cost is increased; in the degradation process, a strong acid medicament is used, so that huge potential safety hazards are brought to production.

SUMMERY OF THE UTILITY MODEL

The invention aims to solve the problems in the prior art and provides a mobile fracturing flow-back fluid treatment device, which realizes low-cost standard-reaching discharge treatment of fracturing flow-back fluids of various complex oil and gas fields.

In order to solve the problems in the invention, the technical scheme is as follows: the movable fracturing flow-back fluid treatment device comprises a waste fluid tank, a water diversion device, a coagulation reactor, a primary pretreatment device, a secondary pretreatment device, an intermediate water tank, a primary fine filter, a secondary fine filter and a clear water tank; the waste liquid tank is communicated with a water diversion device through a water absorption pipeline, the water diversion device is connected with a coagulation reactor through a pipeline, and a raw water pressure pump and a pipeline mixer are sequentially arranged on the pipeline connecting the water diversion device and the coagulation reactor; the coagulation reactor is respectively connected with the primary pretreatment device and the secondary pretreatment device through pipelines; the primary pretreatment device and the secondary pretreatment device are respectively connected with the intermediate water tank through pipelines; the middle water tank is respectively communicated with the bottom of the first-stage fine filter and the bottom of the second-stage fine filter through pipelines, and a middle pressure pump is arranged on the pipeline of the middle water tank communicated with the first-stage fine filter and the second-stage fine filter; the upper part of the first-stage fine filter and the upper part of the second-stage fine filter are respectively communicated with a clear water tank through pipelines.

Preferably, one side of the water diversion device is connected with an alkali liquor adding and matching device.

Preferably, a vacuum pump is further connected between the raw water pressurizing pump and the pipeline mixer.

Preferably, the pipeline mixer is respectively communicated with the PAC dosing device and the PAM dosing device.

Preferably, a gas-liquid stirrer and a foam scraping machine are arranged in the primary pretreatment device, and the gas-liquid stirrer is further connected with a gas distributor arranged outside the primary pretreatment device.

Preferably, a disinfectant adding device is communicated with the secondary pretreatment device.

Preferably, the upper part of the middle water tank is provided with a decolorant feeding device.

Preferably, one side of the primary fine filter is provided with a coating groove, the bottom of the coating groove is respectively communicated with the lower part of the primary fine filter and the lower part of the secondary fine filter through cleaning pumps, the upper parts of the primary fine filter and the secondary fine filter are respectively communicated with the upper part of the coating groove through pipelines, and the lower part of the clean water tank is communicated with the upper part of the coating groove through pipelines.

Preferably, the upper part of the primary fine filter, the upper part of the secondary fine filter and the upper part of the coating groove are respectively communicated with a gas storage device.

Has the advantages that:

the fracturing flow-back fluid treatment device can effectively remove oil, suspended matters, COD, ammonia nitrogen and heavy metals in sewage, the treated water quality reaches the discharge standard, and two requirements of discharge and reuse can be met simultaneously.

Description of the drawings:

FIG. 1 is a schematic view of the flow structure of the present invention.

The specific implementation mode is as follows:

the invention will be further explained below with reference to the accompanying drawings:

the movable fracturing flow-back fluid treatment device comprises a waste fluid tank 1, a water diversion device 2, a coagulation reactor 3, a primary pretreatment device 4, a secondary pretreatment device 5, an intermediate water tank 6, a primary fine filter 7, a secondary fine filter 8 and a clear water tank 9; the waste liquid tank 1 is communicated with a water guider 2 through a water absorption pipeline 10, the water guider 2 is connected with a coagulation reactor 3 through a pipeline, and a raw water pressure pump 11 and a pipeline mixer 12 are sequentially arranged on the pipeline connecting the water guider 2 and the coagulation reactor 3; the coagulation reactor 3 is respectively connected with a primary pretreatment device 4 and a secondary pretreatment device 5 through pipelines; the primary pretreatment device 4 and the secondary pretreatment device 5 are respectively connected with an intermediate water tank 6 through pipelines; the middle water tank 6 is respectively communicated with the bottom of the primary fine filter 7 and the bottom of the secondary fine filter 8 through pipelines, and a middle pressure pump 23 is arranged on the pipeline of the middle water tank 6 communicated with the primary fine filter 7 and the secondary fine filter 8; the upper part of the first-stage fine filter 7 and the upper part of the second-stage fine filter 8 are respectively communicated with a clear water tank 9 through pipelines.

One side of the water diversion device 2 is connected with an alkali liquor adding and matching device; a vacuum pump 13 is also connected between the raw water pressurizing pump 11 and the pipeline mixer 12; the pipeline mixer 12 is respectively communicated with a PAC dosing device 14 and a PAM dosing device 15.

A gas-liquid stirrer 16 and a foam scraping machine 17 are arranged in the primary pretreatment device 4, and the gas-liquid stirrer 16 is also connected with a gas distributor 18 arranged outside the primary pretreatment device 4.

A disinfectant adding device 19 is communicated with the secondary pretreatment device 5; the upper part of the middle water tank 6 is provided with a decolorant adding device 20.

One side of the first-stage fine filter 7 is provided with a coating groove 21, the bottom of the coating groove 21 is respectively communicated with the lower part of the first-stage fine filter 7 and the lower part of the second-stage fine filter 8 through cleaning pumps 22, the upper part of the first-stage fine filter 7 and the upper part of the second-stage fine filter 8 are respectively communicated with the upper part of the coating groove 21 through pipelines, and the lower part of the clean water tank 9 is communicated with the upper part of the coating groove 21 through pipelines.

The upper part of the first-stage fine filter 7, the upper part of the second-stage fine filter 8 and the upper part of the coating groove 21 are respectively communicated with a gas storage device 24.

The design scheme is used for the water treatment device of the gas field gas well drilling fracturing flow-back fluid, and the main process flow is a primary vehicle-mounted pretreatment device and a secondary vehicle-mounted fine treatment device. The complete set of devices comprises three automobiles: two of the two are mobile engineering vehicles, the whole equipment is skid-mounted on a flat car, and the other one is an auxiliary dispensing and medicine conveying vehicle. When the air enters the well to start operation or after the operation, the engineering vehicle is driven to the well drilling site, the sludge inlet, outlet and discharge emptying pipelines are connected, and the vehicle-mounted water treatment device can be immediately put into water treatment operation. The power supply of the vehicle-mounted device is provided by a diesel generator on the vehicle.

The continuously running water treatment equipment is divided into two portions, one portion is pretreatment equipment, namely a skid-mounted flat car, the other portion is fine treatment equipment, the other portion is a skid-mounted flat car, the drilling hydraulic fracture firstly flows into an on-site waste water tank, and the drilling hydraulic fracture is pressurized into the pretreatment equipment to carry out dosing, mixing reaction, flocculation, sedimentation and separation. The effluent of the pretreatment device automatically flows into a middle water tank at the front stage of the fine treatment device. The outlet water of the intermediate water tank is lifted to the fine filter by the intermediate pressure pump for treatment, and the treated purified outlet water can be directly reused or discharged by users.

The final sludge discharge and the emptying water of the whole set of device are all stored in a movable steel box, the steel box is divided into two grids, the supernatant and the precipitated sludge are respectively divided into one grid, a matched pressure pump is used for pressurizing the sludge to a dewatering device to be processed into a sludge cake, and the supernatant sewage is transferred to a waste water tank on site for secondary processing.

The continuous treatment capacity of the drilling fracturing flow-back fluid treatment device is designed to be 25-50t/h, and the continuous working period is 5-24 hours. The quality of the outlet water meets the requirements of the user on the quality of the repeatedly crosslinked prepared liquid or the treatment of the non-crosslinked repeatedly utilized water quality.

The process flow of the invention is as follows:

the method comprises the steps of on-site waste liquid tank → water suction pipe → water diversion device → raw water pressure pump → pipeline mixer → raw water flow meter → coagulation reactor → primary pretreatment → secondary pretreatment → intermediate water tank → intermediate pressure pump → primary fine filter → secondary fine filter → water production flow meter → clean water tank or clean water tank → user liquid distribution for recycling or discharging.

Claims

1. The movable fracturing flow-back fluid treatment device is characterized by comprising a waste fluid tank (1), a water diversion device (2), a coagulation reactor (3), a primary pretreatment device (4), a secondary pretreatment device (5), an intermediate water tank (6), a primary fine filter (7), a secondary fine filter (8) and a clear water tank (9); the waste liquid tank (1) is communicated with the water diversion device (2) through a water absorption pipeline (10), the water diversion device (2) is connected with the coagulation reactor (3) through a pipeline, and a raw water pressure pump (11) and a pipeline mixer (12) are sequentially arranged on the pipeline connecting the water diversion device (2) and the coagulation reactor (3); the coagulation reactor (3) is respectively connected with a primary pretreatment device (4) and a secondary pretreatment device (5) through pipelines; the primary pretreatment device (4) and the secondary pretreatment device (5) are respectively connected with the intermediate water tank (6) through pipelines; the middle water tank (6) is respectively communicated with the bottom of the primary fine filter (7) and the bottom of the secondary fine filter (8) through pipelines, and a middle pressure pump (23) is arranged on the pipeline through which the middle water tank (6) is communicated with the primary fine filter (7) and the secondary fine filter (8); the upper part of the first-stage fine filter (7) and the upper part of the second-stage fine filter (8) are respectively communicated with a clear water tank (9) through pipelines.

2. The mobile fracturing flow-back fluid treatment device of claim 1, wherein one side of the water diversion device (2) is connected with an alkali liquor adding and matching device.

3. The mobile fracturing flow-back fluid treatment device according to claim 1, wherein a vacuum pump (13) is further connected between the raw water pressurizing pump (11) and the pipeline mixer (12).

4. The mobile frac flowback fluid treatment plant of claim 1, wherein the conduit mixer (12) communicates with a PAC dosing unit (14) and a PAM dosing unit (15), respectively.

5. The mobile fracturing flow-back fluid treatment device according to claim 1, wherein a gas-liquid stirrer (16) and a foam scraper (17) are arranged in the primary pretreatment device (4), and the gas-liquid stirrer (16) is further connected with a gas distributor (18) arranged outside the primary pretreatment device (4).

6. The mobile frac flowback fluid treatment plant of claim 1, wherein a disinfectant dosing device (19) is provided in communication with the secondary pretreatment device (5).

7. The mobile frac flowback fluid treatment plant of claim 1, wherein a decolorant dosing device (20) is provided at the upper part of the intermediate water tank (6).

8. The mobile fracturing flow-back fluid treatment device according to claim 1, wherein one side of the primary fine filter (7) is provided with a coating tank (21), the bottom of the coating tank (21) is respectively communicated with the lower part of the primary fine filter (7) and the lower part of the secondary fine filter (8) through a cleaning pump (22), the upper part of the primary fine filter (7) and the upper part of the secondary fine filter (8) are respectively communicated with the upper part of the coating tank (21) through pipelines, and the lower part of the clean water tank (9) is communicated with the upper part of the coating tank (21) through pipelines.

9. The mobile fracturing flow-back fluid treatment device of claim 1, wherein the upper part of the primary fine filter (7), the upper part of the secondary fine filter (8) and the upper part of the coating tank (21) are respectively communicated with a gas storage device (24).