CN212079284U

CN212079284U - Novel gas-liquid-solid three-phase cyclone desanding device

Info

Publication number: CN212079284U
Application number: CN202020442487.XU
Authority: CN
Inventors: 符显峰; 孙悦; 程文利; 孙长亮; 付林丰; 张虎晨; 张倩; 刘锦伟
Original assignee: CNOOC Energy Development of Equipment and Technology Co Ltd
Current assignee: CNOOC Energy Development of Equipment and Technology Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-12-04
Anticipated expiration: 2030-03-31

Abstract

A novel gas-liquid-solid three-phase cyclone desanding device comprises a cyclone separator, wherein a vertical exhaust pipe and a horizontal liquid inlet pipe are arranged at the top end of the cyclone separator in a penetrating mode, a horizontal liquid discharge pipe is arranged in the middle of the cyclone separator in a penetrating mode, a bottom port of the cyclone separator is communicated with a sand storage tank through a shut-off valve, and a bypass pipe is arranged between the cyclone separator and the sand storage tank in a penetrating mode; a flow restrictor is arranged on the bypass pipe; a sand discharge valve is arranged at the bottom port of the sand storage tank, and a material level meter is fixedly arranged on the sand storage tank vertically. The utility model aims at providing a liquid water content in the reducible sediment outflow does not need the outside to provide extra sand washing water, can single carry out the whirl sand removing device of desanding operation in succession.

Description

Novel gas-liquid-solid three-phase cyclone desanding device

Technical Field

The utility model relates to a desanding technical field especially relates to a novel solid three-phase whirl desanding of gas-liquid device.

Background

Along with the continuous deep exploitation of natural gas fields in China, the problem of sand production of gas wells in partial areas, particularly high-yield gas wells, is getting more serious day by day, and great damage is caused to ground gathering, transportation and treatment systems. The sand remover is installed at the natural gas wellhead, so that gravel in the natural gas can be effectively removed, and downstream equipment can be well protected. However, because the pressure of the well head is high, the medium is complex, the fluid is variable, and the sand removal of the well head is more difficult than that of the gas gathering station, the metering station and the transfer station. The cyclone separation technology has the advantages of simple equipment structure, small occupied space, low cost, simple maintenance, low energy consumption, high efficiency and environmental protection, can flexibly, continuously and reliably complete separation tasks in the working process, has certain automaticity and stability and is widely applied. The traditional cyclone desander is only suitable for separating gas phase from solid phase from liquid phase, and when the desanding task of liquid-containing natural gas is processed, the sand discharge frequency is increased, so that the workload is increased, and the problem to be solved is the processing of a large amount of discharged liquid water. In addition, a single traditional cyclone desander can not carry out continuous desanding operation, and in order to ensure that the desanding operation is continuously carried out, two cyclone desanders are generally required to be connected in parallel, and when one cyclone desander is used for discharging sand, the other cyclone desander is started to carry out the desanding operation, so that the engineering construction cost is high. Meanwhile, the sand discharge starting time of the traditional cyclone sand remover needs to be calculated according to the water content and sand content of natural gas, the sand discharge starting time cannot be accurately controlled when the water content and sand content of the natural gas fluctuate greatly, external high-pressure water needs to be introduced to wash the sand storage tank in the sand discharge process, the sand discharge process needs manual operation, and after sand discharge is completed, air in the sand storage tank is mixed with natural gas injected in a follow-up separation process, so that potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the above-mentioned prior art, aim at providing a liquid water content in the reducible sediment outflow, do not need the outside to provide extra sand washing water, can singly carry out the whirl sand removing device of degritting operation in succession.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a novel gas-liquid-solid three-phase cyclone desanding device comprises a cyclone separator, wherein a vertical exhaust pipe and a horizontal liquid inlet pipe are arranged at the top end of the cyclone separator in a penetrating mode, a horizontal liquid discharge pipe is arranged in the middle of the cyclone separator in a penetrating mode, a bottom port of the cyclone separator is communicated with a sand storage tank through a shut-off valve, and a bypass pipe is arranged between the cyclone separator and the sand storage tank in a penetrating mode; a flow restrictor is arranged on the bypass pipe; a sand discharge valve is arranged at the bottom port of the sand storage tank, and a material level meter is fixedly arranged on the sand storage tank vertically.

Furthermore, the height of the cylindrical section of the cyclone separator is 2 times of that of the conical section.

Furthermore, the liquid discharge pipe penetrates through the axis position of the cyclone separator, and the pipe orifice of the insertion end is vertically downward.

Furthermore, the bypass pipe is horizontally inserted into the position of the axis at one end of the cyclone separator, is bent downwards by 90 degrees along the axis and is inserted into the conical section of the cyclone separator, and the length of the bent vertical pipe section is 2/3 of the height of the conical section of the cyclone separator.

Furthermore, the shutoff valve and the sand discharge valve are explosion-proof type electric control pneumatic ball valves.

Further, the flow restrictor is formed by a single-hole flow restricting orifice plate.

Further, the level meter is composed of a vibrating material density meter.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses can realize that the solid three-phase medium of gas-liquid separates simultaneously, when keeping conventional cyclone advanced performance, add the shutoff valve between cyclone and the sand storage pipe, can realize that the area is pressed and is arranged sand under the condition that single device does not stop production, reduces engineering construction cost. The device can realize continuous sand removal of the compact gas well under the conditions of no production stop and no pressure reduction.

2. The cyclone separator cylinder section is provided with the fluid-discharge tube, can in time discharge the liquid of separating outward, reduces the sand discharge frequency, and the fluid-discharge tube design that extends to cyclone separator axis department has reduced the content of solid sand grain in the liquid of discharge, ensures the desanding efficiency of whirl sand removal device, and liquid discharges in advance and makes the sand discharge liquid content reduce, reduces the emission and handles degree of difficulty and cost.

3. The bypass pipe is communicated between the cyclone separator and the sand storage pipe, when sand discharging operation is carried out, liquid stored in the cyclone separator is introduced to wash the sand storage tank, and the single-hole flow limiting pore plate is arranged on the bypass pipe and used for controlling the flow rate of introduced sand washing water, so that the device is ensured to run stably. The sand discharge process does not need to provide extra washing water outside, so that the engineering construction cost is reduced, and the working efficiency is improved. The sand removing process does not need manual operation, and the manual operation amount is reduced.

4. And a material level meter is arranged on the sand storage tank and used for detecting the material level of a medium in the sand storage tank and controlling the start and stop of the sand discharge process by matching with a control system. The sand discharge process always keeps the internal pressure of the device to be greater than atmospheric pressure, so that the external air cannot enter the cyclone sand removal device, and potential safety hazards are eliminated.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic top view of the present invention.

Description of reference numerals:

1-cyclone separator, 2-sand storage tank, 3-shutoff valve, 4-sand discharge valve, 5-bypass pipe, 6-current limiter, 7-level meter, 11-liquid inlet pipe, 12-gas outlet pipe and 13-liquid discharge pipe.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 and 2, a novel gas-liquid-solid three-phase cyclone desanding device comprises a cyclone separator 1, wherein a vertical exhaust pipe 12 and a horizontal liquid inlet pipe 11 are arranged at the top end of the cyclone separator 1 in a penetrating manner, a liquid outlet pipe 13 is arranged in the middle of the cyclone separator 1 in a horizontal penetrating manner and reaches the axial position of the cyclone separator 1, the liquid outlet pipe 13 is inserted into the end opening of the end and is vertically downward, the bottom port of the cyclone separator 1 is communicated with a sand storage tank 2 through a shut-off valve 3, a bypass pipe 5 is arranged between the cyclone separator 1 and the sand storage tank 2 in a penetrating manner, and the height of a cylindrical section of the cyclone separator 1 is 2 times that of a conical section; a flow restrictor 6 is arranged on the bypass pipe 5, the bypass pipe 5 is horizontally inserted into the position of an axis at one end of the cyclone separator 1, bends downwards along the axis for 90 degrees and is inserted into the conical section of the cyclone separator 1, and the length of the bent vertical pipe section is 2/3 of the height of the conical section of the cyclone separator 1; a sand discharge valve 4 is arranged at the bottom port of the sand storage tank 2, a material level meter 7 is vertically and fixedly arranged on the sand storage tank 2, and the material level meter 7 is composed of a vibrating material densimeter; the shutoff valve 3 and the sand discharge valve 4 are explosion-proof type electric control pneumatic ball valves; the flow restrictor 6 is formed by a single orifice restrictor orifice plate.

The process treatment steps of the liquid-containing natural gas of the utility model are as follows: opening shut-off valve 3, closing sand discharge valve 4, cyclone separator 1 and sand storage tank 2 are because inside UNICOM, and the pressure is unanimous, let pending contain liquid natural gas get into cyclone separator 1 from feed liquor pipe 11, make solid particle and liquid in cyclone separator 1, carry out the separation of gas-liquid-solid through centrifugal force and the effect of gravity, make solid and a small amount of liquid sink to sand storage tank 2 in by shut-off valve 3, make clean gaseous natural gas discharge by blast pipe 12 at cyclone separator 1 top, realized gaseous phase separation export outward. The settled solid and liquid are continuously accumulated in the sand storage tank 2, the solid phase is at the lower liquid phase, the liquid level is gradually raised to the liquid discharge pipe 13 in the middle of the cyclone separator 1, the liquid discharge pipe 13 continuously flows out of the liquid phase, and the split-phase external transportation of the liquid is realized. Meanwhile, the liquid discharge pipe 13 plays a role in liquid level limitation, so that the liquid level cannot continuously rise, the space of the cyclone flow field of the cyclone separator 1 on the upper part of the liquid discharge pipe 13 is ensured to be unoccupied, and the continuous cyclone separation condition is met.

The whole cyclone sand removing device can be controlled by a PLC system matched level meter 7, the conical section at the top of a sand storage tank 2 is arranged to be a high level, the conical section at the bottom of the sand storage tank 2 is arranged to be a low level, the automatic start and stop of the sand discharging process are realized by matching a PLC control system, a shut-off valve 3 is opened under the normal operation working condition, a bottom sand discharging valve 4 is closed, a cyclone separator 1 is communicated with the inside of the sand storage tank 2, the pressure is consistent, and the solid and liquid mixture which flows out in a cyclone manner is settled in the sand storage tank 2. When the solid material level of the sand storage tank 2 reaches a high set point, the on-line sand discharge working condition is started, the shut-off valve 3 is closed, the sand discharge valve 4 is opened, a small normal pressure storage tank is usually arranged at the downstream of the pipeline of the sand discharge valve 4, at the moment, because the sand storage tank 2 is under pressure and the back pressure is the atmospheric pressure, a pressure difference is formed, the sand-water mixture in the sand storage tank 2 is discharged downstream, and the split-phase output of the solid phase is realized. The pressure in the sand tank 2 decreases gradually as the mixture is discharged, and at this time, because the cyclone separator 1 is communicated with the sand tank 2 through the bypass pipe 5 with the flow restrictor 6, the cyclone separator 1 forms a continuous pressure difference with the sand tank 2, and because of the flow restriction of the flow restrictor 6, the continuous pressure difference can be formed. The liquid in the cyclone 1 can thus be continuously passed as flushing water through the bypass pipe 5 to the sand tank 2. When the solid material level of the sand storage tank 2 reaches a low set point, the online sand discharge working condition is completed, the shutoff valve 3 is automatically opened, the sand discharge valve 4 is automatically closed, and the equipment recovers to the normal working condition.

The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a novel solid three-phase cyclone sand removal of gas-liquid device, includes cyclone, vertical blast pipe and horizontally feed liquor pipe, its characterized in that are worn to be equipped with on cyclone's top: a horizontal liquid discharge pipe penetrates through the middle of the cyclone separator, a bottom port of the cyclone separator is communicated with the sand storage tank through a shut-off valve, and a bypass pipe penetrates through the cyclone separator and the sand storage tank; a flow restrictor is arranged on the bypass pipe; a sand discharge valve is arranged at the bottom port of the sand storage tank, and a material level meter is fixedly arranged on the sand storage tank vertically.

2. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the height of the cylindrical section of the cyclone separator is 2 times of that of the conical section.

3. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the liquid discharge pipe penetrates through the axis position of the cyclone separator, and the pipe orifice of the insertion end is vertically downward.

4. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the bypass pipe is horizontally inserted into the position of an axis at one end of the cyclone separator, bends downwards along the axis for 90 degrees and is inserted into the conical section of the cyclone separator, and the length of the bent vertical pipe section is 2/3 of the height of the conical section of the cyclone separator.

5. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the shutoff valve and the sand discharge valve are explosion-proof type electric control pneumatic ball valves.

6. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the current limiter is composed of a single-hole current limiting orifice plate.

7. The novel gas-liquid-solid three-phase cyclone desanding device of claim 1 is characterized in that: the level meter is composed of a vibrating material density meter.