CN211144466U - Multi-stage circulating degassing device - Google Patents

Abstract

The utility model belongs to the technical field of downhole operation of oil and gas wells, and discloses a multi-stage circulating degassing device, which comprises a buffer tank, one end of the buffer tank is provided with a liquid inlet pipe, and the upper part of the other end is provided with a main gas pipe, and further comprises a stirring tank, which is used for stirring The circulation inlet pipe and the circulation outlet pipe are connected between the tank and the buffer tank to realize the circulation of the fluid between the stirring tank and the buffer tank through the circulation inlet pipe and the circulation outlet pipe. The upper part of the stirring tank is also connected with the main gas pipe through pipelines. , a liquid discharge pipe is externally connected to the circulation outlet pipe, and a liquid discharge pump is also arranged on the liquid discharge pipe. The utility model includes two gas-liquid separation processes, one is the separation process of free gas in the buffer tank, the other is the stirring separation and vacuum separation process of bubbles in the liquid in the stirring tank, and the fluid after stirring and separation can be returned to the buffer tank. And it is sucked into the stirring tank again, and the process of multi-stage circulating exhaust is carried out, which improves the separation efficiency of the gas in the flowback liquid.

Description

Multi-stage circulating degassing device

technical field

The utility model belongs to the technical field of downhole operation of oil and gas wells, and is suitable for the degassing process in the process of processing waste gas produced by oil and gas wells, in particular to a multi-stage circulating degassing device.

Background technique

After the oil and gas well is perforated, due to sufficient formation energy, fluid will flow out of the formation and return to the surface; or after the acid fracturing operation, due to the opening of the formation diversion channel, the fluid will enter the wellbore and return to the surface. In this part of the fluid, some toxic and harmful gases such as VOCs, H ₂ S, or alkane flammable gases will be entrained. If it is directly discharged without treatment, it is easy to cause a flash explosion accident, resulting in casualties and property losses. Therefore, this part of the gas entrained in the fluid must be treated.

Gas-liquid separation is required prior to the treatment of harmful gases entrained in the fluid. At present, the method used in the field of oil and gas wells is to use a gas-liquid two-phase separator for separation. However, the device has a low gas separation efficiency, mainly for the free gas of the separation part, and cannot achieve a good separation effect for the bubbles mixed in the liquid. In the process of separating gas, in order to ensure that the free gas can be separated, the pressure in the separation tank needs to be controlled. Therefore, the device is a pressure vessel during the working process, and pressure detection is required. There is also a certain danger. Improper operation can easily lead to danger. ACCIDENT. In addition, the entire gas-liquid two-phase separator device is large, which brings great trouble to the work of dismantling, moving and installing, and in some cases is restricted by the transportation road conditions, which is not conducive to its application.

Therefore, there is an urgent need for a degassing device to improve the gas-liquid separation efficiency in the flowback fluid of oil and gas wells, thereby improving the treatment effect of toxic and harmful gases.

SUMMARY OF THE INVENTION

The purpose of this utility model is to solve the above technical problems and provide a multi-stage circulating degassing device with compact structure, efficient separation, small footprint and convenient transportation.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

A multi-stage circulating degassing device comprises a buffer tank, one end of the buffer tank is provided with a liquid inlet pipe, the upper part of the other end is provided with a main gas pipe, and a stirring tank is also included, and a circulating inlet pipe and a circulating outlet pipe are passed between the stirring tank and the buffer tank. The communication is set to realize the circulation of the fluid between the stirring tank and the buffer tank through the circulation inlet pipe and the circulation outlet pipe. The upper part of the stirring tank is also connected with the main gas pipe through pipelines, and a liquid discharge pipe is externally connected to the circulation outlet pipe. A liquid discharge pump is also provided on the liquid pipe. Further, the circulation inlet pipe is connected between the bottom of the stirring tank and the bottom of the buffer tank, and the circulation outlet pipe is connected between the middle part of the outer wall of the stirring tank and the middle and lower part of the buffer tank. Further, the multistage circulating degassing device also includes a vacuum pump and a pressure relief tank. One end of the vacuum pump is connected to the upper part of the stirring tank through a vacuum exhaust pipe, and the other end is connected to the pressure relief tank through a connecting gas pipe, and the pressure relief tank is connected to the pressure relief tank through an exhaust pipe. to the main trachea. Further, the buffer tank, the stirring tank, the drain pump, the vacuum pump and the pressure relief tank are integrated on the bracket.

Specifically, a multi-stage circulating degassing device includes a buffer tank, a stirring tank, a vacuum pump, a pressure relief tank, a liquid discharge pump, a liquid inlet pipe, a circulation inlet pipe, a circulation outlet pipe, a main gas pipe, a vacuum exhaust pipe, and a connecting gas pipe , exhaust pipe, drain pipe, stirring motor, vacuum pump motor, bracket, control cabinet.

The multi-stage circulating degassing device mainly includes two gas-liquid separation processes, one is the separation process of free gas in the buffer tank, and the other is the stirring separation and vacuum separation process of bubbles in the liquid in the stirring tank. One end of the buffer tank is connected with the liquid inlet pipe, the other end is connected with the main gas pipe, and the middle part is connected with the circulation inlet pipe and the circulation outlet pipe. The wellhead return fluid first enters the buffer tank. When the fluid enters the buffer tank, due to the increased space, the free gas automatically escapes and enters the main gas pipe.

The bottom of the mixing tank is connected to the buffer tank through the circulation inlet pipe and the side of the mixing tank is connected to the buffer tank respectively; the upper surface of the mixing tank is connected to the vacuum pump through the vacuum exhaust pipe; the vacuum pump is connected to the pressure relief tank through the connecting gas pipe; the exhaust pipe is connected by the pressure relief tank After extending, it is connected to the main gas pipe; the vacuum pump is driven by the vacuum pump motor, and the stirring tank is driven by the stirring motor. During the working process, the vacuum pump evacuates the stirring tube into a vacuum state through the vacuum exhaust pipe, thereby pumping the fluid in the buffer tank into the stirring tank; in the stirring tank, under the operation of the stirring motor, the fluid is stirred and dispersed, This is conducive to the overflow of bubbles, and because the stirring tank is in a vacuum state, it is conducive to the floating of bubbles; the separated gas enters the connecting gas pipe through the vacuum exhaust pipe, and then enters the connecting gas pipe through the vacuum pump, then enters the pressure relief tank, and finally merges through the exhaust pipe. Main gas pipe; the fluid stirred and separated in the stirring tank enters the buffer tank through the circulation outlet pipe, and is sucked into the stirring tank together with the fluid in the buffer tank again, and the process of multi-stage circulating exhaust is carried out.

The drain pump is connected to the circulation outlet pipe through the drain pipe; the control cabinet controls the start and stop of each motor through electrical signals. When the buffer tank is about to be fully filled, the drain pump is started, and the liquid is drained through the drain pipe and the circulation outlet pipe. At this time, the cycle degassing process of the whole device continues. When the liquid level in the buffer tank drops to a certain height, the drainage pump is closed to stop the drainage.

All components of the entire unit are integrated into the stand for easy transport and management.

The beneficial effects of the utility model are: the multi-stage circulating degassing device realizes two separations of gas through the free separation of the buffer tank, the stirring and separation of the stirring tank and the vacuum separation operations, and the circulation of the liquid in the buffer tank and the stirring tank is achieved. , to achieve multi-stage separation of gas, thereby improving the separation efficiency of gas in the flowback liquid, and the overall device is controlled by the electric control of the control cabinet, which is convenient for management, integrated into a unified support, easy to transport, and ensures the multi-stage circulating degassing device. Practicality and application effect in gas separation of oil and gas wells.

Description of drawings

Fig. 1 is the overall external view of the utility model;

Fig. 2 is the working principle diagram of the utility model;

3 is an external view of the other side of the utility model;

Fig. 4 is the front view of the utility model;

Fig. 5 is the top view of the utility model;

Figure 6 is a rear view of the utility model.

In the figure: 1. Buffer tank; 2. Stirring tank; 3. Vacuum pump; 4. Pressure relief tank; 5. Drain pump; 6. Liquid inlet pipe; 7. Circulation inlet pipe; 8. Circulation outlet pipe; 9. Main Air pipe; 10. Vacuum pumping pipe; 11. Connecting air pipe; 12. Exhaust pipe; 13. Drain pipe; 14. Stirring motor; 15. Vacuum pump motor; 16. Bracket; 17. Control cabinet.

Detailed ways

Below in conjunction with the accompanying drawings and specific embodiments, the present utility model is described in further detail:

1 to 6 , a multi-stage circulating degassing device provided by the present invention includes a buffer tank 1, a stirring tank 2, a vacuum pump 3, a pressure relief tank 4, a liquid discharge pump 5, a liquid inlet pipe 6, and a circulation inlet. Pipe 7, circulating outlet pipe 8, main gas pipe 9, vacuum exhaust pipe 10, connecting gas pipe 11, exhaust pipe 12, liquid drain pipe 13, stirring motor 14, vacuum pump motor 15, bracket 16, control cabinet 17. One end of the buffer tank 1 is connected with the liquid inlet pipe 6 , the other end is connected with the main gas pipe 9 , and the middle part is connected with the circulation inlet pipe 7 and the circulation outlet pipe 8 . The wellhead return liquid first enters the buffer tank 1 through the liquid inlet pipe 6 . The free gas escapes in the buffer tank 1 and enters the main gas pipe 9 . The bottom of the stirring tank 2 is connected with a circulation inlet pipe 7, and the side is connected with a circulation outlet pipe 8, and the connection with the buffer tank 1 is realized through these two pipelines. The upper surface of the stirring tank 2 is connected to the vacuum pump 3 through a vacuum exhaust pipe 10 . The vacuum pump 3 is connected to the pressure relief tank 4 through a connecting gas pipe 11 . The exhaust pipe 12 is extended from the pressure relief tank 4 and then connected to the main gas pipe 9 . The vacuum pump 3 is driven by the vacuum pump motor 15 to work, and the stirring tank 2 is driven by the stirring motor 14 to work. The drain pump 5 is connected to the circulation outlet pipe 8 through a drain pipe 13 .

During the working process, the gas in the buffer tank 1 escapes freely and enters the main gas pipe 9 . The vacuum pump 3 evacuates the stirring tank 2 into a vacuum state through the vacuum exhaust pipe 10 , and sucks the liquid in the buffer tank 1 into the stirring tank 2 through the circulation inlet pipe 7 . And the liquid is stirred under the driving of the stirring motor 14, so that the bubbles mixed in the liquid gather and overflow. And in the vacuum state, the bubbles float free from the surface of the liquid. The separated gas enters the vacuum pump 3 through the vacuum exhaust pipe 10 , enters the pressure relief tank 4 through the connecting gas pipe 11 , and then merges into the main gas pipe 9 through the exhaust pipe 12 . The liquid stirred and separated in the stirring tank 2 flows back into the buffer tank 1 through the circulation outlet pipe 8, and after mixing with the liquid in the buffer tank 1, it is sucked into the stirring tank 2 again for multi-stage circulating exhaust. process. When the buffer tank 1 is about to be fully filled, the liquid discharge pump 5 is started, and the liquid is discharged into the liquid storage tank through the liquid discharge pipe 13 . When the liquid level in the buffer tank 1 drops to a certain height, the liquid discharge pump 5 is turned off to stop the liquid discharge. During the whole working process, the control cabinet 17 controls the start and stop of each motor through electrical signals. The entire device is integrated into the bracket 16 for easy hoisting, transportation and management.

The above are only the most representative embodiments of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention shall belong to the scope of the present invention.

Claims (4)

1. a multi-stage circulating degassing device, comprising a buffer tank, one end of the buffer tank is provided with a liquid inlet pipe, and the upper part of the other end is provided with a main gas pipe, it is characterized in that, also comprises a stirring tank, between the stirring tank and the buffer tank, by circulating The inlet pipe and the circulation outlet pipe are connected and arranged to realize the circulation of the fluid between the stirring tank and the buffer tank through the circulation inlet pipe and the circulation outlet pipe. The upper part of the stirring tank is also connected with the main gas pipe through pipelines. The drain pipe is also provided with a drain pump. 2. The multistage circulating degassing device according to claim 1, wherein the circulating inlet pipe is connected between the bottom of the stirring tank and the bottom of the buffer tank, and the circulating outlet pipe is connected between the middle part of the outer wall of the stirring tank and the buffer tank. between the middle and lower parts of the tank. 3. multistage circulating degassing device according to claim 1, is characterized in that, also comprises vacuum pump and pressure relief tank, one end of vacuum pump is connected with the upper part of stirring tank by vacuum exhaust pipe, and the other end is connected with the pressure relief tank by connecting gas pipe Connect, the pressure relief tank is connected to the main gas pipe through the exhaust pipe. 4 . The multistage circulating degassing device according to claim 2 , wherein the buffer tank, the stirring tank, the drain pump, the vacuum pump and the pressure relief tank are integrated on the support. 5 .

Images