Sulfur-separating well head sulfur-blocking preventing system
Technical Field
The invention relates to the technical field of sulfur blocking prevention of wellhead, in particular to a sulfur blocking prevention system of a sulfur precipitation wellhead.
Background
At present, after natural gas in high sulfur content gas production wells at home and abroad is produced through a gas production tree, sulfur deposition phenomenon often occurs in a ground gathering pipeline for conveying the natural gas and a corresponding treatment device, so that the situations of blocking the gathering pipeline, a throttle valve, a separator and the like by sulfur are easy to occur, and the normal production of the gas production well is directly affected.
In order to solve the problem of sulfur blockage, the conventional methods at the present stage are as follows: a steam car pyrolysis blocking method, a high-pressure gas blowing method, a sulfur solvent soaking method, a sulfur removal agent filling method and the like. The steam car thermal blocking removing method is mainly used for heating blocking parts to melt the blocking objects by utilizing the steam car to heat the blocking parts, has a good blocking removing effect, is easy to rust the pipelines and equipment, and has an unsatisfactory effect particularly in environments with lower air temperature and higher humidity in winter. The high-pressure gas purging method has the advantages that the production of the gas production well is stopped, the high-pressure gas at the rear part of the blocking position is utilized to purge the blocking position, and then the high-pressure gas purging method is matched with a steam car to blow out foreign matters at the blocking position, so that the time consumption is long, and the effect is poor. The sulfur solvent soaking method is mainly used for mechanically cleaning and soaking small detachable equipment, cannot be suitable for gathering and conveying pipelines and large equipment devices, and meanwhile, production stopping is required for a gas production well, so that the practicability is not strong. Although the sulfur removal agent filling method is researched in recent years only after the domestic research time is relatively late, the application of the sulfur removal agent filling process overcomes the defects of the methods, the method has the advantages of being capable of effectively removing the blockage of different blockage parts on the premise of not affecting production, wide in application range, small in influence on system production operation parameters and the like, so that the sulfur removal agent is a main sulfur removal blockage method, has certain corrosiveness and toxicity, is accompanied with pungent odor and has secondary pollution to the environment, the sulfur removal agent in the current stage is low in sulfur capacity and long in reaction time, simple sulfur can be effectively dissolved by long-time contact, and the addition amount and the addition period are increased.
Disclosure of Invention
In view of the problems existing in the background art, the invention aims to provide a sulfur separation wellhead sulfur blocking prevention system, which is characterized in that sulfur particles in natural gas containing sulfur particles are dispersed by adding a sulfur removal dispersing agent aqueous solution at the upstream of a throttle valve, so that the phenomenon of sulfur blocking at the throttle valve is avoided; the gas-liquid cyclone separation device and the liquid-solid cyclone separation device are combined to effectively separate gas, liquid and solid in the mixture of the natural gas containing sulfur particles and the sulfur removal dispersing agent aqueous solution, so that the separation effect is enhanced, the separation efficiency is improved, and the natural gas is conveyed beneficially.
In order to achieve the above object, the present invention provides a sulfur removal wellhead sulfur blocking prevention system, comprising: the device comprises a gas production tree, a throttle valve, a dispersing agent adding device, a gas-liquid cyclone separation device and a liquid-solid cyclone separation device.
The gas production tree is communicated with the gas production well and produces natural gas containing sulfur particles in the gas production well.
The throttle valve is arranged at the downstream of the gas production tree and is communicated with the gas production tree, and has a throttle valve inlet and a throttle valve outlet.
The dispersant adder accommodates a sulfur removal dispersant aqueous solution, is arranged between the gas production tree and the throttle valve and is communicated with the throttle valve inlet.
The gas-liquid cyclone separator is arranged at the downstream of the throttle valve and comprises: the inlet of the gas-liquid cyclone separation device is communicated with the outlet of the throttle valve; a gas outlet of the gas-liquid cyclone separation device; and a liquid outlet of the gas-liquid cyclone separation device.
The liquid-solid cyclone separator is arranged downstream of the gas-liquid cyclone separator and has: the inlet of the liquid-solid cyclone separation device is communicated with the liquid outlet of the gas-liquid cyclone separation device; a liquid outlet of the liquid-solid cyclone separator; and a solid outlet of the liquid-solid cyclone separation device.
The dispersant adder adds a sulfur removal dispersant aqueous solution between the gas production tree and the throttle valve, and natural gas containing sulfur particles in the gas production well is dispersed under the action of the sulfur removal dispersant aqueous solution after being produced by the gas production tree and flows into the gas-liquid cyclone separation device through the throttle valve and the inlet of the gas-liquid cyclone separation device.
In the gas-liquid cyclone separating device, the gas-liquid cyclone separating device carries out gas-liquid separation on the mixture of the sulfur removal dispersing agent aqueous solution and the natural gas containing sulfur particles, the separated natural gas is discharged through a gas outlet of the gas-liquid cyclone separating device, and the separated liquid containing sulfur particles flows into the gas-liquid cyclone separating device through a liquid outlet of the gas-liquid cyclone separating device and an inlet of the gas-liquid cyclone separating device.
In the liquid-solid cyclone separation device, the liquid-solid cyclone separation device performs liquid-solid separation on the liquid containing sulfur particles, the separated liquid is discharged through a liquid outlet of the liquid-solid cyclone separation device, and the separated sulfur particles are discharged through a solid outlet of the liquid-solid cyclone separation device.
The beneficial effects of the invention are as follows:
In the sulfur-separating wellhead sulfur blocking prevention system, the sulfur-removing dispersant aqueous solution is added between the gas production tree and the throttle valve through the dispersant adder, wherein the sulfur-removing dispersant in the sulfur-removing dispersant aqueous solution can reduce the surface tension of sulfur particles and disperse the sulfur particles into water, so that the aggregation of the sulfur particles is avoided, and meanwhile, the dispersion stability time of the sulfur particles is prolonged, and the phenomenon of sulfur blocking at the inlet of the throttle valve after the throttle valve is depressurized is avoided. And the sulfur removal dispersing agent aqueous solution and the natural gas containing sulfur particles are mixed between the gas production tree and the throttle valve and then enter the gas-liquid cyclone separation device together through the throttle valve, the gas-liquid cyclone separation device separates natural gas with different densities from liquid through cyclone action, and the dispersed sulfur particles are contained in the liquid and then separated out through the liquid-solid cyclone separation device, so that the separation effect is greatly enhanced, the separation efficiency is improved, and the natural gas conveying is facilitated. In addition, the gas-liquid cyclone separation device and the liquid-solid cyclone separation device can be miniaturized and skid-mounted, can be directly loaded and pulled, reduce the installation workload and can be reused.
Drawings
FIG. 1 is a schematic process flow diagram of a sulfur removal wellhead sulfur plug prevention system according to the present invention.
Wherein reference numerals are as follows:
1 gas production tree 5 liquid-solid cyclone separator
2 Throttle valve 51 liquid-solid cyclone separator inlet
21 Throttle valve inlet 52 liquid outlet of liquid-solid cyclone separator
22 Throttle valve outlet 53 solid outlet of liquid-solid cyclone separator
3 Dispersant adder 6 gas receiving device
4 Liquid receiving device of gas-liquid cyclone separator 7
41 Gas-liquid cyclone separator inlet 8 solid receiving device
Gas production well with gas outlet A of 42 gas-liquid cyclone separator
43 Gas-liquid cyclone separator liquid outlet
Detailed Description
The sulfur-removal wellhead sulfur-blocking prevention system according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a sulfur block prevention system for a sulfur separation wellhead according to the present invention includes: a gas production tree 1, a throttle valve 2, a dispersant adder 3, a gas-liquid cyclone separation device 4 and a liquid-solid cyclone separation device 5.
The gas production tree 1 is communicated with the gas production well A and produces natural gas containing sulfur particles in the gas production well A. The throttle valve 2 is provided downstream of the gas production tree 1 and communicates with the gas production tree 1, and has a throttle valve inlet 21 and a throttle valve outlet 22.
The dispersant adder 3 contains a sulfur removal dispersant aqueous solution, is provided between the gas production tree 1 and the throttle valve 2, and communicates with the throttle valve inlet 21.
The gas-liquid cyclone separator 4 is provided downstream of the throttle valve 2, and has: an inlet 41 of the gas-liquid cyclone separator is communicated with the throttle valve outlet 22; a gas outlet 42 of the gas-liquid cyclone separator; a liquid outlet 43 of the gas-liquid cyclone separation device.
The liquid-solid cyclone separator 5 is provided downstream of the gas-liquid cyclone separator 4, and includes: an inlet 51 of the liquid-solid cyclone separator, which is connected to the liquid outlet 43 of the gas-liquid cyclone separator; a liquid outlet 52 of the liquid-solid cyclone separator; a solid outlet 53 of the liquid-solid cyclone separator.
Wherein, the dispersant adder 3 adds the aqueous solution of the sulfur removal dispersant (namely, the solution formed by dissolving the sulfur removal dispersant into water) between the gas production tree 1 and the throttle valve 2, and after the natural gas containing sulfur particles in the gas production well A is produced by the gas production tree 1, the natural gas is dispersed and flows into the gas-liquid cyclone separation device 4 by the throttle valve 2 and the inlet 41 of the gas-liquid cyclone separation device.
In the gas-liquid cyclone separator 4, the gas-liquid cyclone separator 4 performs gas-liquid separation of a mixture of the sulfur removal dispersant aqueous solution and the natural gas containing sulfur particles, the separated natural gas is discharged through the gas outlet 42 of the gas-liquid cyclone separator, and the separated liquid containing sulfur particles flows into the liquid-solid cyclone separator 5 through the liquid outlet 43 of the gas-liquid cyclone separator and the inlet 51 of the liquid-solid cyclone separator.
In the liquid-solid cyclone separator 5, the liquid-solid cyclone separator 5 performs liquid-solid separation of the sulfur-containing particles, the separated liquid is discharged through the liquid outlet 52 of the liquid-solid cyclone separator, and the separated sulfur particles are discharged through the solid outlet 53 of the liquid-solid cyclone separator.
In the sulfur-separating wellhead sulfur blocking prevention system, a sulfur-removing dispersant aqueous solution is added between the gas production tree 1 and the throttle valve 2 through the dispersant adder 3, wherein the sulfur-removing dispersant in the sulfur-removing dispersant aqueous solution can reduce the surface tension of sulfur particles and disperse the sulfur particles into water, so that the aggregation of the sulfur particles is avoided, and meanwhile, the dispersion stability time of the sulfur particles is also prolonged, and the phenomenon of sulfur blocking at the throttle valve inlet 21 after the throttle valve 2 is depressurized is avoided. And, the sulfur removal dispersant aqueous solution and the natural gas containing sulfur particles are mixed between the gas production tree 1 and the throttle valve 2 and then enter the gas-liquid cyclone separation device 4 together through the throttle valve 2, the gas-liquid cyclone separation device 4 separates natural gas and liquid with different densities through the cyclone action, and the dispersed sulfur particles are contained in the liquid and then separated out through the liquid-solid cyclone separation device 5, so that the separation effect is greatly enhanced, the separation efficiency is improved, and the natural gas conveying is facilitated. In addition, the gas-liquid cyclone separation device 4 and the liquid-solid cyclone separation device 5 can be miniaturized and skid-mounted, can be directly loaded and pulled, reduce the installation workload and can be reused.
The dispersant adder 3 may be a pipeline pump that adds an aqueous solution of a sulfur removal dispersant to the sulfur-containing granular natural gas between the gas production tree 1 and the throttle valve 2. The aqueous solution of the sulfur removal dispersing agent can be an aqueous solution of sodium dodecyl sulfate, namely a solution formed by dissolving sodium dodecyl sulfate into water.
Referring to fig. 1, the gas outlet 42 of the gas-liquid cyclone separator may be located at the top of the gas-liquid cyclone separator 4, while the liquid outlet 43 of the gas-liquid cyclone separator is located at the bottom of the gas-liquid cyclone separator 4. The structural positional relationship between the gas outlet 42 of the gas-liquid cyclone separator and the liquid outlet 43 of the gas-liquid cyclone separator facilitates the discharge of the natural gas and the liquid containing sulfur particles from the gas-liquid cyclone separator 4, respectively. Referring to fig. 1, the liquid-solid cyclonic separating apparatus liquid outlet 52 may be located at the top of the liquid-solid cyclonic separating apparatus 5 and the liquid-solid cyclonic separating apparatus solid outlet 53 is located at the bottom of the liquid-solid cyclonic separating apparatus 5. The structural positional relationship between the liquid outlet 52 of the liquid-solid cyclone separator and the solid outlet 53 of the liquid-solid cyclone separator facilitates the discharge of liquid and sulfur particles from the liquid-solid cyclone separator 5, respectively.
Referring to fig. 1, the sulfur removal wellhead sulfur shutoff prevention system may further include: the gas receiving device 6 is communicated with the gas outlet 42 of the gas-liquid cyclone separation device to receive the natural gas separated by the gas-liquid cyclone separation device 4. The gas receiving means 6 may be any means by which the natural gas may be further processed.
Referring to fig. 1, the sulfur removal wellhead sulfur shutoff prevention system may further include: and the liquid receiving device 7 is communicated with the liquid outlet 52 of the liquid-solid cyclone separation device to receive the liquid separated by the liquid-solid cyclone separation device 5. The liquid receiving means 7 may be any means which can further treat the liquid separated by the liquid-solid cyclone separation means 5. Referring to fig. 1, the sulfur removal wellhead sulfur shutoff prevention system may further include: and the solid receiving device 8 is communicated with the solid outlet 53 of the liquid-solid cyclone separating device to receive the sulfur particles separated by the liquid-solid cyclone separating device 5. The sulfur particles separated by the liquid-solid cyclone separation device 5 can be comprehensively utilized.
Finally, the gas production tree 1, the throttle valve 2, the gas-liquid cyclone separation device 4 and the liquid-solid cyclone separation device 5 are communicated through corresponding connecting pipelines, the gas receiving device 6 is communicated with the gas outlet 42 of the gas-liquid cyclone separation device through a natural gas pipeline, the liquid receiving device 7 is communicated with the liquid outlet 52 of the liquid-solid cyclone separation device through a sewage pipeline, and all the connecting pipelines, the natural gas pipeline and the sewage pipeline form a ground gathering pipeline for conveying the natural gas. In the process of conveying the natural gas containing sulfur particles, the invention can also avoid the sulfur blocking phenomenon of the sulfur particles at any position in a ground gathering and conveying pipeline based on the combined action of the dispersant adder 3, the gas-liquid cyclone separation device 4 and the liquid-solid cyclone separation device 5, thereby being beneficial to the conveying of the natural gas.