A flowback well fluid online treatment system

Abstract

The invention discloses a kind of flowback well fluid online processing system, the system includes separating device and mixer, separating device and mixer are installed in processing device containing tank, processing device containing tank is fixed in sled frame;Separating device is fixed on overflow partition with overflow slot hole, single-flow valve is installed in main partition below overflow partition, and gas-liquid separation space is communicated with water treatment space;Flowback well fluid inlet pipeline is communicated with the outer cylinder of separating device in gas-liquid separation space, medicament adding pipeline is communicated with water treatment space with mixer, gas guide pipeline and gas safety valve are installed on the upper portion of the outer cylinder of separating device, and treatment fluid outlet pipeline is installed at the bottom of water treatment space with mixer.The invention significantly reduces the number of devices involved in the processing system, suitable for offshore oil platforms, to avoid using ships for flowback well fluid recovery construction Various defects, but also can be used for land acidification operation well.

Description

TECHNICAL FIELD

[0001] The present application relates to a device for treating well fluid returned from well operation in the oil industry, in particular to an online treatment system for well fluid returned from well operation, especially suitable for use in offshore oil platforms. BACKGROUND

[0002] In order to increase the production of oil and ensure that the production of oil can meet the needs of economic development in China, offshore oil fields are developed on a large scale year by year, and the level of exploration and development technology is improved year by year. In view of the problems in actual production such as high pressure and low permeability of the formation, and blockage of pore throats between particle diameters, a low-cost acidizing and plugging removal process is usually used for treatment. The acid-containing well fluid after acidizing construction has a great adverse effect on gathering and distribution due to the presence of chloride ions.

[0003] Therefore, the acid-containing well fluid after traditional acidizing construction on the offshore oil platform generally needs to be discharged to an oil tanker for transportation to Code Head and then transported to a waste liquid station for treatment. Due to the influence of many factors such as ocean currents, wind direction, anchor points, etc. on ship recovery construction, the discharge speed of the operation well and the recovery efficiency of the ship do not match, the discharge of the operation well lags behind, leading to secondary precipitation of the products after acidizing, resulting in poor acidizing construction effect and low oil well productivity. In addition to the above-mentioned defects, the use of ship recovery construction has high safety risks, high ship costs and high costs for later waste liquid treatment, which seriously restricts the rhythm of increasing oil production on the sea.

[0004] Therefore, it is necessary to invent an online treatment device for well fluid returned from well operation to treat the well fluid after acidizing on site, so that the well fluid after acidizing can meet the requirements of directly entering the production process, and solve the problems and defects of the need for ship construction for the discharge of well fluid after existing acidizing construction.

[0005] There are many online acidizing treatment devices in the prior art, such as the following patent technologies, but there are few disclosures of acidizing online treatment equipment that can meet the needs of offshore oil platforms.

[0006] CN201510455194.9 discloses an online recycling treatment process for water well acidizing and discharge fluid. The specific steps of the process are as follows: the acidizing and discharge fluid is first subjected to degassing and sand removal by a three-phase separation device; the water discharged from the three-phase separation device is subjected to rapid neutralization and rapid oxidation to neutralize the residual acid in the discharge fluid and oxidize Fe2+ therein; the neutralized water is subjected to air flotation treatment after the addition of a flocculating agent and a coagulant aid to remove oil, iron ions and suspended solids in the discharge fluid; the water discharged from the air flotation is subjected to two-stage filtration treatment of multi-media filtration and fine filtration to remove suspended solids and reduce the particle size median of the suspended solids; and the filtered water is used as acidizing and discharge circulating water after passing through a buffer tank.

[0007] The above process technology requires many devices and large volume devices, high energy consumption, and needs more construction personnel to cooperate with construction, hoisting combination is more difficult, so it can not meet the online processing requirements of offshore oil platform after daily acidification.

[0008] CN201410220092.4 discloses an oil and gas well large-scale acid pressure backflow process residual acid online processing system and processing method, including detection branch, alkali discharge branch and control branch, the purpose of the invention is mainly to replace the manual throwing solid alkali neutralization operation mode.

[0009] The above patent technology can only neutralize the residual acid in the backflow process, and cannot process the backflow well fluid, so it cannot meet the online processing requirements of offshore daily acidification backflow well fluid.

[0010] CN201721635696.0 discloses a residual acid online processing system for acidification and acid pressure backflow operation, including a buffer tank, a pretreatment tank and a residual acid treatment tank connected in sequence, a dosing device one and a stirring device one are arranged in the pretreatment tank, the dosing device one is arranged above the stirring device one, a dosing device two, an online monitoring device and a stirring device two are arranged in the residual acid treatment tank, the dosing device two is arranged above the stirring device two, a controller is arranged outside the residual acid treatment tank, and the controller is connected with the online monitoring device and the dosing device two.

[0011] The above patent technology is directly connected with the backflow pipeline, which can harmless treatment of backflow fluid, the treated backflow fluid directly enters the oilfield produced fluid treatment system with the formation produced fluid, through this residual acid online processing method, the problems of acidification backflow fluid cannot be directly discharged, the need for professional processing place, long distance transportation risk, high investment and other problems are solved, the backflow fluid is not landed treatment, the economic benefit is remarkable, and the environment is not polluted.

[0012] But the above patent technology is also a system with many devices and too large volume, which is not suitable for offshore oil platform acidification construction. SUMMARY

[0013] The purpose of the present application is to provide a backflow well fluid online processing system, which is small in size, light in weight and designed as a sled, so that it becomes an online backflow fluid processing system capable of gas-liquid separation and neutralization treatment of the separated liquid. Reduce the number of devices involved in the treatment of the existing backflow acidification well fluid processing system, reduce the installation workload of the system devices. It can be applied to offshore oil platforms, improve construction efficiency, avoid the various defects of ship recovery construction, and can also be used for acidification operation wells on land.

[0014] The technical solution of the present application is: a flowback well fluid online treatment system, comprising a separation device and a stirrer, the stirrer is connected with a stirrer reducer box of a stirring motor, wherein: the separation device and the stirrer are both installed in a treatment device containing tank, the treatment device containing tank is fixed in a sled frame; the treatment device containing tank is divided into a gas-liquid separation space and a water treatment space by a main partition, the separation device is installed in the gas-liquid separation space, the stirrer is installed in the water treatment space, the centrifugal cylinder in the separation device is driven by a separation motor, and the stirrer is driven by the stirrer reducer box; the separation device is fixed on an overflow partition plate provided with an overflow slot hole, a one-way valve is installed in the main partition below the overflow partition plate, and the gas-liquid separation space and the water treatment space are communicated; a flowback well fluid inlet pipeline is communicated with an outer cylinder of the separation device in the gas-liquid separation space, a medicament adding pipeline is communicated with the water treatment space provided with the stirrer, a gas guide pipeline and a gas safety valve are installed on the outer cylinder of the separation device, and a treatment fluid outlet pipeline is installed at the bottom of the water treatment space provided with the stirrer.

[0015] Preferably, the sled frame is made of light high-strength alloy material and is provided with connecting rods, frame connecting shafts, an operation grid and a cable-stayed fastening cable, the connecting rods are connected with each other through the frame connecting shafts, the frame connecting shafts are fastened with each other through the cable-stayed fastening cable, and the operation grid is fixed on the connecting rods above the treatment device containing tank.

[0016] Preferably, the connecting rods are hollow rods, and the rod bodies at two ends are respectively provided with corresponding insertion grooves or insertion holes, and the connecting rods can be inserted through the insertion grooves or insertion holes.

[0017] Preferably, the frame connecting shafts are provided with connecting shaft fixing seats, ball press discs, fastening cable connecting rings and press rings, the fastening cable connecting rings are welded at the two ends of the frame connecting shafts, and the two ends of the frame connecting shafts are respectively the connecting shaft fixing seats and the ball press discs; the outer diameters of the connecting shaft fixing seats and the press rings are both greater than the widths or inner diameters of the insertion grooves or insertion holes of the connecting rod ends, the outer diameters of the rod bodies of the frame connecting shafts and the ball press discs are both smaller than the inner diameter of the connecting rod and the widths or inner diameters of the insertion grooves or insertion holes of the connecting rod ends; one end of the frame connecting shaft provided with the ball press disc can pass from the rod body at one end of the inserted connecting rod to the outside of the other end of the inserted port of the connecting rod and be clamped into the press ring outside the ball press disc.

[0018] Preferably, the cable-stayed fastening cable is provided with traction hooks with locking tongues at two ends and a locking adjusting mechanism at the middle part, the traction hooks at the two ends of the cable-stayed fastening cable can be connected with the fastening cable connecting rings fixed at the two ends of the frame connecting shafts; the locking adjusting mechanism comprises a screw sleeve and a bolt, the screw sleeve is fixed at one end of the middle part of the cable-stayed fastening cable and the bolt is fixed at the other end of the middle part, and the screw sleeve and the bolt are threadedly connected.

[0019] Preferably, the operation grid is a grid structure and its size is consistent with the inner size of the sled frame, the inside of the connecting rod above the tank is provided with a grid lap joint step, and the operation grid is fixed on the grid lap joint step by bolts; one side of the sled frame is provided with a ladder, which is composed of H-shaped plug-in sections of cross supports and vertical supports, and the plug-in sections are plugged into each other through the taper holes and taper rods at both ends of the vertical supports; the lowermost plug-in section of the ladder is fixed to the bottom of the connecting rod, and a hanging ring is fixed to the cross support of the uppermost plug-in section, which can be connected with a fall protector; the distance between the operation grid and the connecting rod at the top of the sled frame is set to be between 1.3m and 1.5m.

[0020] Preferably, the separation device is a two-phase separation device, and the outer cylinder and the centrifugal cylinder are both inverted conical, the cylinder wall of the centrifugal cylinder is provided with non-equal-diameter through holes, and a separation bearing seat is arranged between the bottom of the cylinder body and the overflow partition plate, and the rotating shaft at the bottom of the centrifugal cylinder is installed in the separation bearing seat; the bottom of the outer cylinder of the separation device is fixed on the overflow partition plate, and the annulus between the outer cylinder and the centrifugal cylinder of the separation device is communicated with the overflow partition plate.

[0021] Preferably, the separation motor of the separation device, the stirring motor of the stirrer and the stirring motor reducer are all fixed on the operation grid, and liquid level detector one and liquid level detector two are also arranged in the operation grid at positions corresponding to the gas-liquid separation space and the water treatment space in the tank of the treatment device, respectively, and the liquid level detection tubes of the liquid level detector one and the liquid level detector two fixed on the operation grid can extend into the gas-liquid separation space and the water treatment space in the tank of the treatment device; the liquid level detector one and the liquid level detector two are wireless liquid level detectors.

[0022] Preferably, a gas guide safety valve is installed at the top of the gas guide pipeline connected with the outer cylinder of the separation device, and the gas guide safety valve is connected with a standby gas guide pipeline, and a normal pressure gas guide pipeline is connected in parallel in the gas guide pipeline below the standby gas guide pipeline. When the separation motor rotates the centrifugal cylinder at high speed through the rotating shaft, the well fluid is thrown on the outer cylinder through the through holes under the action of centrifugal force, and the oil-soluble gas contained in the well fluid is separated from the well fluid, achieving two-phase separation.

[0023] Preferably, a stirring bearing seat is arranged between the bottom of the stirrer and the bottom plate of the tank of the treatment device, and the rotating shaft of the stirrer is installed in the stirring bearing seat; the stirring blades in the stirrer are spiral blades and at least two groups are installed, the outer diameters of the spiral blades are equal, but the widths of the spiral blades are not equal; when more than three groups of spiral blades are installed, the spiral blades with unequal widths are installed in an interval and the spiral directions are opposite.

[0024] Preferably, a manhole cover is arranged on one side of the bottom of the gas-liquid separation space of the separation device in the treatment device accommodating tank, a liquid level meter is arranged on the outer wall of the water treatment space of the agitator in the treatment device accommodating tank, and the medicament adding pipeline is connected to the upper outer wall of the water treatment space in the treatment device accommodating tank; the liquid level meter is a flap type liquid level meter and is arranged on the outer wall of the treatment device accommodating tank above the treatment liquid outlet pipeline.

[0025] Preferably, a spring is arranged between the valve ball and the ball seat of the single-way valve, one end of the spring is fixed to the ball seat and the other end is fixed to the valve ball, the ball seat of the single-way valve is arranged in the gas-liquid separation space in which the separation device is arranged, and one end of the valve ball of the single-way valve is arranged in the water treatment space in which the agitator is arranged.

[0026] Preferably, a supporting block is arranged between the bottom plate of the trailer frame and the tank bottom of the treatment device accommodating tank, the outer part of the supporting block is L-shaped and the inner angle is an arc shape corresponding to the outer edge of the tank bottom of the treatment device accommodating tank, the supporting block is provided with more than four blocks, and the bottom of the supporting block is fixed to the trailer frame; the treatment device accommodating tank is made of glass fiber reinforced plastic or acid-resistant stainless steel, and the supporting block is made of light composite material.

[0027] Preferably, the flowback well fluid inlet pipeline, the treatment liquid outlet pipeline, the medicament adding pipeline, the normal pressure gas guide pipeline and the standby gas guide pipeline are connected to external pipelines through high-pressure ball valves and high-pressure oil nipples; and the top of the trailer frame is provided with a lifting ring.

[0028] The significant use effect of the present application is that: 1. The system significantly reduces the number of devices involved in the treatment of the flowback acidizing well fluid treatment system, reduces the installation workload of the system devices, is suitable for offshore oil platforms and significantly improves the construction efficiency, avoids various defects of using ships for flowback well fluid recovery construction, and can also be used for acidizing operation wells on land.

[0029] 2. In the present system, the main partition plate and the single-way valve divide the treatment device accommodating tank into two relatively independent and timely connected treatment spaces, i.e. a gas-liquid separation space and a water treatment space, the separation device is arranged in the gas-liquid separation space and the agitator is arranged in the water treatment space, thereby greatly reducing the volume of the treatment system.

[0030] 3. The flowback well fluid in the operation well can be quickly and efficiently separated into gas and liquid, and after adding treatment medicaments, the well fluid can be quickly stirred to separate oil and water and perform acid-base neutralization, thereby meeting the requirements of being transported to a production process or being injected into a well.

[0031] 4. The treatment system has high automation degree, is convenient to use and safe to work, requires fewer construction personnel and has low construction labor intensity.

[0032] 5、The processing system has small volume, light weight, integrated functions, pry design, and is convenient to move, and is very suitable for use in the oil platform, has remarkable use effect and can produce good economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0034] Figure 1 is a structural schematic diagram of the present application.

[0035] Figure 2 is a working principle diagram of the present application.

[0036] Figure 3 is Figure 1 is a structural schematic diagram of the middle frame connecting shaft.

[0037] In the drawing: sled frame 1, frame connecting shaft 1-1, connecting shaft fixing seat 1-1-1, billiard ball pressing disc 1-1-2, fastening cable connecting ring 1-1-3, pressing ring 1-1-4, ladder 1-2, operation grating 1-3, hoisting ring 1-4, inclined cable fastening cable 1-5, processing device containing tank 2, supporting block 2-1, main partition plate 2-2, manhole cover plate 2-3, overflow partition plate 2-4, separation device 2-5, separation motor 2-5-1, centrifugal cylinder 2-5-2, separation bearing seat 2-5-3, single-flow valve 2-6, liquid level detector one 2-7, liquid level detector two 2-8, stirring motor reduction box 2-9, stirrer 2-10, liquid level meter 2-11, stirring bearing seat 2-12, flowback fluid inlet pipeline 3, processing fluid outlet pipeline 4, medicament adding pipeline 6, gas guide pipeline 5, normal pressure gas guide pipeline 5-1, standby gas guide pipeline 5-2, gas guide safety valve 5-3. DETAILED DESCRIPTION

[0038] The accompanying drawings are only for reference and illustration, and do not limit the protection scope of the present application. The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0039] In order to make the purpose, technical solutions and advantages of the present application more clear and obvious, the present application will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and do not limit the present application.

[0040] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0041] Referring to Figure 1 - Figure 3 A flowback fluid online treatment system comprises a separation device 2-5 and a stirrer 2-10 connected with a stirring motor reduction box 2-9 of a stirring motor, wherein: the separation device 2-5 and the stirrer 2-10 are both installed in a treatment device containing tank 2 fixed in a sled frame 1; the treatment device containing tank 2 is divided into a gas-liquid separation space and a water treatment space by a main partition plate 2-2, the separation device 2-5 is installed in the gas-liquid separation space, and the stirrer 2-10 is installed in the water treatment space, a centrifugal cylinder 2-5-2 in the separation device 2-5 is driven by a separation motor 2-5-1, and the stirrer 2-10 is driven by the stirring motor reduction box 2-9; the separation device 2-5 is fixed on an overflow partition plate 2-4 provided with an overflow groove hole, a single-flow valve 2-6 is installed in the main partition plate 2-2 below the overflow partition plate 2-4 to communicate the gas-liquid separation space with the water treatment space; a flowback fluid inlet pipeline 3 communicates with an outer cylinder of the separation device 2-5 in the gas-liquid separation space, a medicament adding pipeline 6 communicates with the water treatment space where the stirrer 2-10 is installed, a gas guide pipeline 5 and a gas safety valve 5-3 are installed on the upper part of the outer cylinder of the separation device 2-5, and a treatment liquid guide pipeline 4 is installed at the bottom of the water treatment space where the stirrer 2-10 is installed.

[0042] The present application uses a sled design, the devices involved in the treatment are few, the separation device 2-5 and the stirrer 2-10 are both installed in the treatment device containing tank 2, the whole treatment system has small volume and light weight, and is designed in a sled type, the gas-liquid separation can be carried out through the separation device 2-5, the liquid separated by the separation device 2-5 can be neutralized and treated through the stirrer 2-10 and the medicament added through the medicament adding pipeline 6, and then the treated liquid can be pumped into the production process or the injection well through the treatment liquid guide pipeline 4 and the liquid conveying pump; the gas separated by the separation device 2-5 can be discharged to the production process through the gas guide pipeline 5.

[0043] The present application reduces the number of devices involved in the treatment of the flowback well fluid in the online treatment system, reduces the installation workload of the system devices, and has a small footprint. The present application is very suitable for offshore oil platforms, and is also suitable for acidizing operation wells on land. When applied to offshore oil platforms, the present application can avoid the various defects of ship recovery construction, has a significant use effect, and can significantly reduce the treatment cost of the flowback well fluid, significantly improve the construction efficiency, and significantly reduce the production cost. When applied to acidizing operation wells on land, the present application also has the advantages of convenient transportation and installation.

[0044] On the basis of the above-mentioned embodiment one, the present application also has the following embodiments:

[0045] A preferred embodiment: the sled frame 1 is made of light high-strength alloy material and is provided with connecting rods, frame connecting shafts 1-1, operation grating 1-3 and inclined cable fastening cables 1-5, the connecting rods are connected through the frame connecting shafts 1-1, the frame connecting shafts 1-1 are fastened through the inclined cable fastening cables 1-5, and the operation grating 1-3 is fixed on the connecting rods above the treatment device containing tank 2. The light high-strength alloy material includes silicon carbide magnesium aluminum alloy, low alloy high-strength steel and high-strength PP alloy material.

[0046] A preferred embodiment: the connecting rod is a hollow rod, and a plug-in slot or a plug-in hole is arranged in each end of the rod body, and the connecting rods can be plugged through the plug-in slots or the plug-in holes.

[0047] A preferred embodiment: the frame connecting shaft 1-1 is provided with a connecting shaft fixing seat 1-1-1, a billiard ball pressing disc 1-1-2, a fastening cable connecting ring 1-1-3 and a pressing ring 1-1-4, the fastening cable connecting ring 1-1-3 is welded at both ends of the frame connecting shaft 1-1, and both ends of the frame connecting shaft 1-1 are the connecting shaft fixing seat 1-1-1 and the billiard ball pressing disc 1-1-2 respectively; the outer diameters of the connecting shaft fixing seat 1-1-1 and the pressing ring 1-1-4 are both greater than the width or the inner diameter of the plug-in slot or the plug-in hole at the end of the connecting rod, and the outer diameters of the rod body of the frame connecting shaft 1-1 and the billiard ball pressing disc 1-1-2 are both smaller than the inner diameter of the connecting rod and the width or the inner diameter of the plug-in slot or the plug-in hole at the end of the connecting rod; one end of the frame connecting shaft 1-1 provided with the billiard ball pressing disc 1-1-2 can pass from the rod body of one end of the plugged connecting rod to the outside of the other end of the plugged port of the connecting rod and be clamped into the pressing ring 1-1-4 outside the billiard ball pressing disc 1-1-2. The billiard balls in the billiard ball pressing disc 1-1-2 can prevent the pressing ring 1-1-4 from moving outward, so that the installed sled frame 1 has a self-locking function.

[0048] A preferred embodiment: the two ends of the cable 1-5 are fixed with traction hooks with lock latches, and the middle part is provided with a locking adjustment mechanism. The traction hooks at the two ends of the cable 1-5 can be connected with the fastening cable connecting ring 1-1-3 fixed at the two ends of the frame connecting shaft 1-1. The locking adjustment mechanism comprises a nut and a bolt. The nut is fixed at one end of the middle part of the cable 1-5, and the bolt is fixed at the other end of the middle part. The nut and the bolt are threadedly connected. The tension of the cable 1-5 can be adjusted. The structure of the traction hook with the lock latch is similar to that of a key hook or a backpack strap hook, which is convenient to take and connect. The body of the cable 1-5 can be made of lightweight Kevlar plastic material. The nut and the bolt arranged in the middle part can adjust the length of the cable 1-5.

[0049] A preferred embodiment: the operation grid 1-3 is a grid structure and its size is consistent with the size of the inside of the sled frame 1. The inside of the connecting rod above the processing device containing tank 2 is provided with a grid lap joint step. The operation grid 1-3 is fixed on the grid lap joint step arranged on the inside of the connecting rod by bolts. One side of the sled frame 1 is provided with a climbing ladder 1-2. The climbing ladder 1-2 is connected by H-shaped plug-in sections composed of horizontal supports and vertical supports. The plug-in sections of the H-shaped plug-in sections are plugged into each other through the taper holes and taper rods at the two ends of the vertical supports. The lowermost plug-in section of the climbing ladder 1-2 is fixed with the bottom of the connecting rod, and the horizontal support of the uppermost plug-in section is fixed with a hanging ring. The hanging ring can be connected with a fall arrestor. The fall arrestor is hung on the horizontal support through the hanging ring, which is safe and meets the safety regulations. The distance between the operation grid 1-3 and the connecting rod at the top of the sled frame 1 is set to be between 1.3m and 1.5m. The construction personnel above the operation grid 1-3 can be effectively protected.

[0050] A preferred embodiment: the separation device 2-5 is a two-phase separation device. The outer cylinder and the centrifugal cylinder 2-5-2 are both inverted conical. The cylinder wall of the centrifugal cylinder 2-5-2 is provided with non-equal-diameter through holes, and the bottom of the cylinder body is provided with a separation bearing seat 2-5-3 between the overflow partition plate 2-4. The rotating shaft at the bottom of the centrifugal cylinder 2-5-2 is installed in the separation bearing seat 2-5-3. The bottom of the outer cylinder of the separation device 2-5 is fixed on the overflow partition plate 2-4. The annulus between the outer cylinder of the separation device 2-5 and the centrifugal cylinder 2-5-2 is communicated with the overflow partition plate 2-4.

[0051] A preferred embodiment: the separation motor 2-5-1 of the separation device 2-5 and the stirring motor and stirring motor reduction box 2-9 of the stirrer 2-10 are fixed on the operation grid 1-3, and liquid level detector one 2-7 and liquid level detector two 2-8 are also respectively arranged in the corresponding positions of the gas-liquid separation space and water treatment space in the treatment device containing tank 2 in the operation grid 1-3, and the liquid level detection tubes of the liquid level detector one 2-7 and the liquid level detector two 2-8 fixed on the operation grid 1-3 can extend into the gas-liquid separation space and the water treatment space in the treatment device containing tank 2; the liquid level detector one 2-7 and the liquid level detector two 2-8 are wireless liquid level detectors. The liquid level detector one 2-7 and the liquid level detector two 2-8 can be wirelessly connected to the terminal downloaded in the computer or the mobile phone of the operator in the production monitoring room and the duty room, are directly powered by 18650 batteries, can emit ultrasonic waves and receive refracted return ultrasonic waves, calculate the liquid level height in the liquid level detection tube according to the refracted return ultrasonic waves, and when the liquid level height exceeds the initial set value, the liquid level detector one 2-7 and the liquid level detector two 2-8 can respectively connect the circuit to sound and light electrically alarm. The liquid level detector one 2-7 and the liquid level detector two 2-8 are commercially available.

[0052] A preferred embodiment: a gas guide safety valve 5-3 is installed at the top of the gas guide pipeline 5 connected to the outer cylinder of the separation device 2-5, and is connected to a standby gas guide pipeline 5-2 through the gas guide safety valve 5-3, and a normal pressure gas guide pipeline 5-1 is connected in parallel in the gas guide pipeline 5 below the standby gas guide pipeline 5-2. When the separation motor 2-5-1 rotates the centrifugal cylinder 2-5-2 at high speed through the rotating shaft, under the action of centrifugal force, the well fluid returns and is thrown on the outer cylinder through the through hole, and the oil-soluble gas contained in the well fluid returns is separated from the well fluid returns, achieving two-phase separation. The gas guide pipeline 5 installed at the top of the outer cylinder of the separation device 2-5 and the normal pressure gas guide pipeline 5-1 form a tee structure, and the oil-soluble gas separated can be output. The standby gas guide pipeline 5-2 is installed in parallel above the normal pressure gas guide pipeline 5-1. In order to ensure safety in construction, when the gas volume is large, the gas back pressure is too high, and exceeds the opening pressure value set by the gas guide safety valve 5-3, the gas guide safety valve 5-3 is opened, and the gas after pressure relief is transported to the production process through the standby gas guide pipeline 5-2.

[0053] A preferred embodiment: a stirring bearing seat 2-12 is arranged between the bottom of the stirrer 2-10 and the bottom plate of the treatment device containing tank 2, and the rotating shaft of the stirrer 2-10 is installed in the stirring bearing seat 2-12; the stirring blades in the stirrer 2-10 are spiral blades and at least two groups are installed, the outer diameters of the spiral blades are equal, but the widths of the spiral blades are not equal; when more than three groups of spiral blades are installed, the spiral blades with unequal widths are installed in a staggered manner and the spiral directions are opposite, which helps to improve the stirring effect and facilitate the generation of vortexes with different directions during rotation, so that the added medicament and well fluid can be fully mixed.

[0054] A preferred embodiment is that a manhole cover 2-3 is installed on one side of the bottom of the gas-liquid separation space of the separation device 2-5 in the treatment device containing tank 2, a water level meter 2-11 is installed on the outer wall of the water treatment space of the treatment device containing tank 2, and the medicament adding pipeline 6 is connected to the upper outer wall of the water treatment space in the treatment device containing tank 2. The water level meter 2-11 is a flap type water level meter and is installed on the outer wall of the treatment device containing tank 2 above the treatment liquid leading pipeline 4. A sealing gasket is installed between the manhole cover 2-3 and the treatment device containing tank 2, the manhole cover 2-3 and the treatment device containing tank 2 are connected by bolts, and the manhole in the treatment device containing tank 2 can be passed through by maintenance personnel.

[0055] A preferred embodiment is that a spring is installed between the valve ball and the ball seat of the one-way valve 2-6, one end of the spring is fixed to the ball seat and the other end is fixed to the valve ball, the ball seat of the one-way valve 2-6 is placed in the gas-liquid separation space where the separation device 2-5 is installed, and one end of the valve ball of the one-way valve 2-6 is placed in the water treatment space where the agitator 2-10 is installed.

[0056] A preferred embodiment is that a supporting block 2-1 is installed between the bottom plate of the dolly frame 1 and the tank bottom of the treatment device containing tank 2, the outer part of the supporting block 2-1 is L-shaped and the inner angle is an arc shape consistent with the outer edge of the tank bottom of the treatment device containing tank 2, the supporting block 2-1 is provided with more than four blocks, and the bottom of the supporting block 2-1 is fixed to the dolly frame 1. The treatment device containing tank 2 is made of glass fiber reinforced plastic or acid-resistant stainless steel, and the supporting block 2-1 is made of light composite material. The top of the supporting block 2-1 is of a size and structure consistent with the curvature of the outer edge of the tank bottom of the treatment device containing tank 2, which can ensure that it is closely combined with the treatment device containing tank 2 and can be fixed to the bottom of the dolly frame 1 by double public screws. The light composite material used in the supporting block 2-1 can be selected from composite glass fiber reinforced plastic, fiber reinforced plastic, and reinforced phenolic plastic. The acid-resistant stainless steel material used in the treatment device containing tank 2 includes 316L, 3Cr13, or 1Cr17Ni2.

[0057] A preferred embodiment is that the flowback fluid inlet pipeline 3, the treatment liquid leading pipeline 4, the medicament adding pipeline 6, the normal pressure gas guiding pipeline 5-1, and the standby gas guiding pipeline 5-2 are all connected to external pipelines through high-pressure ball valves and high-pressure oil nipples; and the top of the dolly frame 1 is provided with a lifting ring 1-4. The external pipelines include a flowback fluid inlet pipeline from the work well connected to the flowback fluid inlet pipeline 3, a conveying pipeline connected between the treatment liquid leading pipeline 4 and the liquid conveying pump, a medicament supply pipeline connected between the medicament adding pipeline 6 and the medicament pump, and pipelines connected to the normal pressure gas guiding pipeline 5-1 and the standby gas guiding pipeline 5-2 and entering the production process.

[0058] The method for using the system of the present application:

[0059] 1. The flowback fluid online treatment system is transported to the construction site, the flowback fluid inlet pipeline 3 from the working well is connected to the flowback fluid pipeline from the working well through a high-pressure oil valve, the treatment fluid outlet pipeline 4 is connected to the liquid delivery pump and the production process of the production well in sequence through the delivery pipeline, or connected to the reinjection valve of the reinjection well through the delivery pipeline, the atmospheric gas guide pipeline 5-1 and the standby gas guide pipeline 5-2 are connected to the casing gas pipeline and the standby wing production pipeline in the production process of the production well, respectively, and the medicament adding pipeline 6 is connected to the medicament pump through the medicament supply pipeline.

[0060] 2. The power supply lines of the separation motor 2-5-1 and the stirring motor reduction box 2-9 are connected to the distribution box, and the construction personnel climbs to the operating grating 1-3 from the ladder 1-2 to set the alarm liquid level values for the liquid level detector 1 and the liquid level detector 2.

[0061] After the flowback of the working well starts, the flowback fluid flows into the centrifugal cylinder 2-5-2 in the flowback fluid online treatment system through the flowback fluid inlet pipeline 3, and the separated gas rises and enters the production process through the atmospheric gas guide pipeline 5-1 and the standby gas guide pipeline 5-2 under the action of centrifugal force at high speed, and the separated liquid flows down along the outer cylinder of the separation device 2-5 by gravity and flows to the bottom of the vertically divided gas-liquid separation space of the main baffle 2-2 from the overflow baffle 2-4.

[0062] When the height of the collected well fluid is greater than the opening pressure of the single-flow valve 2-6, the well fluid flows to the water treatment space vertically divided by the main baffle 2-2 through the single-flow valve 2-6; the demulsifying agent and alkaline chemicals and other treatment chemicals are pumped into the water treatment space through the medicament adding pipeline 6, fully stirred by the stirrer 2-10, and neutralized by acid and alkali in the water treatment space, and the neutralized liquid, i.e. the treated liquid, enters the liquid inlet of the liquid delivery pump through the treatment liquid outlet pipeline 4 and is pumped into the production process or the reinjection well.

[0063] The above-described embodiments are only typical embodiments, but the present application is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teachings of the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and teachings of the present application shall be included in the protection scope of the present application. Therefore, the protection scope is not limited to the above description.

Claims

1. A flowback fluid online treatment system, comprising a separation device (2-5) and a mixer (2-10), the mixer (2-10) being connected with a mixer motor reduction box (2-9) of a mixer motor, characterized in that: The separation device (2-5) and the stirrer (2-10) are both installed in the treatment device containing tank (2) which is fixed in the sled frame (1); the treatment device containing tank (2) is divided into a gas-liquid separation space and a water treatment space by a main partition plate (2-2), the separation device (2-5) is installed in the gas-liquid separation space, and the stirrer (2-10) is installed in the water treatment space; the centrifugal cylinder (2-5-2) in the separation device (2-5) is driven by a separation motor (2-5-1), and the stirrer (2-10) is driven by a stirring motor reduction box (2-9); the separation device (2-5) is fixed on the overflow partition plate (2-4) which is provided with overflow groove holes, and a one-way valve (2-6) is installed in the main partition plate (2-2) below the overflow partition plate (2-4) to communicate the gas-liquid separation space with the water treatment space; a flow-back well fluid inlet pipeline (3) is communicated with the outer cylinder of the separation device (2-5) in the gas-liquid separation space, a medicament adding pipeline (6) is communicated with the water treatment space in which the stirrer (2-10) is installed, a gas guide pipeline (5) and a gas safety valve (5-3) are installed on the upper part of the outer cylinder of the separation device (2-5), and a treatment fluid outlet pipeline (4) is installed at the bottom of the water treatment space in which the stirrer (2-10) is installed; the separation device (2-5) is a two-phase separation device, and the outer cylinder and the centrifugal cylinder (2-5-2) are both inverted conical; the through holes with different diameters are distributed in the cylinder wall of the centrifugal cylinder (2-5-2), and a separation bearing seat (2-5-3) is installed between the bottom of the cylinder body and the overflow partition plate (2-4); the rotating shaft at the bottom of the centrifugal cylinder (2-5-2) is installed in the separation bearing seat (2-5-3); the bottom of the outer cylinder of the separation device (2-5) is fixed on the overflow partition plate (2-4), and the annulus between the outer cylinder of the separation device (2-5) and the centrifugal cylinder (2-5-2) is communicated with the overflow partition plate (2-4); the top of the gas guide pipeline (5) connected with the outer cylinder of the separation device (2-5) is provided with a gas safety valve (5-3) and connected with a standby gas guide pipeline (5-2) through the gas safety valve (5-3), and a normal-pressure gas guide pipeline (5-1) is connected in parallel in the gas guide pipeline (5) below the standby gas guide pipeline (5-2); when the separation motor (2-5-1) drives the centrifugal cylinder (2-5-2) to rotate at high speed through the rotating shaft, the flow-back well fluid is thrown on the outer cylinder through the through holes under the action of centrifugal force, and the oil-soluble gas contained in the flow-back well fluid is separated from the flow-back well fluid, so that the two-phase separation effect is achieved.

2. An online treatment system for flowback fluid as defined by claim 1, wherein, The sled frame (1) is made of light high-strength alloy material and is provided with connecting rods, frame connecting shafts (1-1), an operation grid (1-3) and inclined cable fastening cables (1-5); the connecting rods are connected with each other through the frame connecting shafts (1-1), and the frame connecting shafts (1-1) are fastened with each other through the inclined cable fastening cables (1-5); and the operation grid (1-3) is fixed on the connecting rods above the treatment device containing tank (2).

3. An online treatment system for flowback fluid as defined by claim 2, wherein, The connecting rods are hollow rods, and the rod bodies at both ends are respectively provided with corresponding insertion grooves or insertion holes, and the connecting rods can be inserted through the insertion grooves or insertion holes.

4. An online treatment system for flowback fluid as defined by claim 3, wherein, The frame connecting shaft (1-1) is provided with a connecting shaft fixing seat (1-1-1), a billiard ball pressing disc (1-1-2), a fastening cable connecting ring (1-1-3) and a pressing ring (1-1-4), the fastening cable connecting ring (1-1-3) is welded at both ends of the frame connecting shaft (1-1), and the two ends of the frame connecting shaft (1-1) are respectively the connecting shaft fixing seat (1-1-1) and the billiard ball pressing disc (1-1-2); the outer diameters of the connecting shaft fixing seat (1-1-1) and the pressing ring (1-1-4) are both greater than the width or inner diameter of the insertion slot or insertion hole at the end of the connecting rod, and the outer diameters of the rod body of the frame connecting shaft (1-1) and the billiard ball pressing disc (1-1-2) are both smaller than the inner diameter of the connecting rod and the width or inner diameter of the insertion slot or insertion hole at the end of the connecting rod; one end of the frame connecting shaft (1-1) provided with the billiard ball pressing disc (1-1-2) can pass from the rod body at one end of the inserted connecting rod to the outside of the other end port of the connecting rod and be clamped into the pressing ring (1-1-4) outside the billiard ball pressing disc (1-1-2).

5. An online treatment system for flowback fluid as defined in claim 4, wherein, The both ends of the cable (1-5) are provided with traction hooks with locking tongues, and the middle part is provided with a locking adjusting mechanism, the traction hooks at both ends of the cable (1-5) can be connected with the fastening cable connecting ring (1-1-3) fixed at both ends of the frame connecting shaft (1-1); the locking adjusting mechanism comprises a sleeve and a bolt, one end of the middle part of the cable (1-5) is fixed with the sleeve and the other end of the middle part is fixed with the bolt, and the sleeve is threadedly connected with the bolt.

6. An online treatment system for flowback fluid as defined by claim 2, wherein, The operation grid (1-3) is a grid structure and its size is consistent with the size of the inside of the sled frame (1), the inside of the connecting rod above the processing device containing tank (2) is provided with a grid lapping step, and the operation grid (1-3) is fixed on the grid lapping step provided on the inside of the connecting rod by bolts; one side of the sled frame (1) is provided with a crawling ladder (1-2), the crawling ladder (1-2) is connected by H-shaped insertion sections composed of cross supports and vertical supports, the insertion sections of the H-shaped insertion sections are inserted into each other through the taper holes and taper rods at both ends of the vertical supports; the lowermost insertion section of the crawling ladder (1-2) is fixed with the bottom of the connecting rod, and a hanging ring is fixed in the cross support of the uppermost insertion section, and the hanging ring can be connected with a fall arrester; the distance between the operation grid (1-3) and the connecting rod at the top of the sled frame (1) is set to be between 1.3m and 1.5m.

7. An online treatment system for flowback fluid as defined by claim 6, wherein, The separation motor (2-5-1) of the separation device (2-5) and the stirring motor and stirring motor reduction gearbox (2-9) of the stirrer (2-10) are all fixed on the operation grid (1-3), and liquid level detector one (2-7) and liquid level detector two (2-8) are also respectively arranged at the corresponding positions of the gas-liquid separation space and the water treatment space in the processing device containing tank (2) in the operation grid (1-3), the liquid level detection tubes of the liquid level detector one (2-7) and the liquid level detector two (2-8) fixed on the operation grid (1-3) can extend into the gas-liquid separation space and the water treatment space in the processing device containing tank (2); the liquid level detector one (2-7) and the liquid level detector two (2-8) are wireless liquid level detectors.

8. An online treatment system for flowback fluids as defined in claim 1, wherein, The bottom of the stirrer (2-10) is equipped with a stirring bearing seat (2-12) between the bottom plate of the treatment device containing tank (2), and the rotating shaft of the stirrer (2-10) is installed in the stirring bearing seat (2-12); the stirring blades in the stirrer (2-10) are spiral blades and at least two groups are installed, the outer diameters of the spiral blades are equal, but the widths of the spiral blades are not equal; when more than three groups of spiral blades are installed, the spiral blades with unequal widths are installed in an interval and the spiral directions are opposite.

9. An online treatment system for flowback fluids as defined in claim 1, wherein The gas-liquid separation space of the separation device (2-5) in the treatment device containing tank (2) is equipped with a manhole cover plate (2-3) on one side of the bottom, the outer wall of the water treatment space in the treatment device containing tank (2) is equipped with a liquid level meter (2-11), and the medicament adding pipeline (6) is connected to the upper outer wall of the water treatment space in the treatment device containing tank (2); the liquid level meter (2-11) is a flap type liquid level meter and is installed in the outer wall of the treatment device containing tank (2) above the treatment fluid discharge pipeline (4).

10. An online treatment system for flowback fluids as defined in claim 1, wherein, The single flow valve (2-6) is equipped with a spring between the valve ball and the ball seat, one end of the spring is fixed with the ball seat and the other end is fixed with the valve ball, the ball seat of the single flow valve (2-6) is placed in the gas-liquid separation space where the separation device (2-5) is installed, and one end of the valve ball of the single flow valve (2-6) is placed in the water treatment space where the stirrer (2-10) is installed.

11. An online treatment system for flowback fluid as defined by claim 2, wherein, The bottom plate of the sled frame (1) is equipped with a supporting block (2-1) between the tank bottom of the treatment device containing tank (2), the outer part of the supporting block (2-1) is L-shaped and the inner angle is an arc shape consistent with the outer edge of the tank bottom of the treatment device containing tank (2), the supporting block (2-1) is provided with more than four blocks, and the bottom of the supporting block (2-1) is fixed with the sled frame (1); the treatment device containing tank (2) is made of glass fiber reinforced plastic or acid-resistant stainless steel, and the supporting block (2-1) is made of light composite material.

12. An online treatment system for flowback fluids as defined in claim 1, wherein, The flowback fluid inlet pipeline (3), the treatment fluid discharge pipeline (4), the medicament adding pipeline (6), the normal pressure gas guide pipeline (5-1) and the standby gas guide pipeline (5-2) are connected with external pipelines through high-pressure ball valves and high-pressure oil nuts; the top of the sled frame (1) is equipped with a lifting ring (1-4).

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