Plant for preparation of petroleum associated gas or natural gas for transportation along pipeline and production of liquid hydrocarbons from said gas

FIELD: preparation and transportation of petroleum associated and natural gases.

SUBSTANCE: invention relates to preparation of gas for transportation along gas pipeline and separation of heavy fraction condensate from gas. Proposed plant for preparation of petroleum associated gas or natural gas for transportation along gas pipeline and obtaining of liquid hydrocarbons from gas intake line, device to increase and decrease pressure, gas flow line, liquid hydrocarbons extraction line, three-circuit heat exchanger, separator, expansion valve, two regulating valves and swirl pipe whose input is connected through pressure increasing and decreasing device from one side with inlet gas line through first regulating valve and through series-connected second regulating valve and first circuit of heat exchanger, and from other side, with output of expansion valve. Output of cold flow of swirl pipe is connected through second circuit of heat exchangers with gas flow line, output of hot flow of swirl pipe is connected through third circuit of heat exchanger with input of separator whose condensate output is connected with line to remove liquid hydrocarbons, and gas output, with input of expansion valve.

EFFECT: increased degree of separation of condensate of heavy fractions of hydrocarbons from petroleum associated gas or natural gas designed for transportation along gas pipeline.

1 dwg

 

The technical field to which the invention relates.

The invention relates to methods for moving gas through the pipeline and can be used in oil, chemical, gas, oil refining, gas processing industries for purification of oil and natural gas from condensation of heavy hydrocarbons (C5-C15and impurities emitting light fractions (C1-C4) at the initial stage of gas production and preparation for transportation through the pipeline.

The level of technology

Known device for the compression and transport of gas, comprising a device for increasing gas pressure (compressor), admission and discharge line, the bypass gas line connected with the discharge line of the compressor, locking elements, and installation combined with the pipeline device, an oil separator connected to the pipeline with the selection line of the compressor, and the other with the bypass gas line and oil and gas pipelines, and locking elements mounted on the secondary pipeline is connected through the pressure regulators with gauges suction line of the compressor (USSR Author's certificate No. 1735658, CL F 17 D 1/07, 1992).

The characteristics of the known device that matches the characteristics of the claimed technical solution is the existence of the device the VA to increase the gas pressure (compressor), the admissions and discharge lines, as well as locking elements.

The reason to obtain a technical result, which is provided by the claimed technical solution lies in the fact that the separation of heavy hydrocarbons from the gas at the expense of mass transfer processes in the gas and liquid flow in the receiving pipeline.

The closest analogue (prototype) is the installation for the preparation of oil or natural gas for transportation through the pipeline, including a device for raising or lowering the pressure of the gas admission and discharge gas lines, vortex the tube containing the cochlea and attached piping cold stream and at least one piping hot flow, cooling chamber, which is enclosed piping hot stream, and the condensing unit, which is connected by its input to an output pipe of the hot stream, one of its output - the output of condensate installation, while others go out of their way - with the cooling chamber, while the outlet pipe cold stream is connected with a gas flow line, the inlet chamber is connected with the admission of the gas line, the output of a cooling chamber connected to the inlet of the device to increase or decrease the pressure of the gas, the output of which is connected to the inlet of the vortex tube (Patent RU №2181459 C1, class F 17D 1/02, publication date: 2002.04.20).

The characteristics of the known device that matches the characteristics of the claimed technical solution is to have a device for raising or lowering the gas pressure, the admission and discharge gas line of the vortex tube and the separator (condensing unit).

The reason to obtain a technical result, which is provided by the claimed technical solution is that at the entrance of the vortex tube enters the gas having a relatively high temperature and the concentration of heavy hydrocarbons, which reduces the separation efficiency of the gas flow in the vortex tube.

Disclosure of inventions

The task, which directed the claimed technical solution is to increase the level of separation of condensate heavy fractions of hydrocarbons from petroleum or natural gas intended for transport by pipeline.

The technical result, the mediating solving this problem is the application of the regime of low temperature and concentrations of heavy fractions of hydrocarbons in the gas stream entering the inlet of the vortex tube.

Achieved technical result of the fact that the installation for the preparation of petroleum or natural gas for transportation through the pipeline and the production of liquid hydrocarbons from this g which contains for receiving a gas line, device for raising or lowering the pressure, flow gas line, drain line liquid hydrocarbons, three-circuit heat exchanger, separator, expander, two control valves and a vortex tube, the entrance of which is through the device to increase or decrease the pressure linked, on the one hand, with the admission of the gas line through the first control valve and connected in series through the second control valve and the first circuit heat exchanger, and on the other hand, output expander output of cold flow of the vortex tube through the second loop heat exchanger is connected with a gas flow line, the output of the hot stream of the vortex tube through the third circuit of the heat exchanger is connected with the inlet of the separator, condensate which is connected to the drain line liquid hydrocarbons, and the output of gas from the inlet of the expander.

New features of the claimed technical solution is that the system includes a three-circuit heat exchanger, separator and the expander, and the above relation between the elements of the installation.

The drawing shows a functional diagram of the installation for the preparation of petroleum or natural gas for transportation through the pipeline.

The implementation of the invention

Installation for the preparation of petroleum or natural gas for transportation through the pipeline and received the I liquid hydrocarbons from the gas includes receiving a gas line 1, at which is supplied a source of petroleum or natural gas, the device 2 to increase or decrease gas pressure (compressor or vacuum pump), gas flow line 3, which from the installation in the pipeline for further transportation arrives purified from heavy hydrocarbon fractions of petroleum or natural gas, line 4 removal of liquid hydrocarbons, three-circuit heat exchanger 5 with the first 51second 52and the third 53contours, the separator 6 to exit 61the condensate and the output 62gas expander 7, including a device for lowering the temperature of the gas due to its expansion, the first 8 and second 9 control valves, vortex tube 10, including the snail 101, which is the entrance of this vortex tube, the pipeline 102cold stream, which is the output of cold flow of the vortex tube, and the pipe 103hot flow, which is the output of the hot flow of the vortex tube.

Input 101the vortex tube 10 through the device 2 to increase or decrease the pressure linked, on the one hand, with the admission of the gas line 1 through the first control valve 8 and connected in series through the second control valve 9 and the first circuit 51the heat exchanger 5. On the other hand, the input 101the vortex tube 10 che is ez device 2 to increase or decrease the pressure connected to the output of the expander 7. Output 102cold flow of the vortex tube 10 through the second path 52the heat exchanger 5 is connected with a discharge gas line 3. The output of the hot stream 103the vortex tube 10 through the third circuit 53the heat exchanger 5 is connected to the input of the separator 6, 61the condensate which is connected to the line 4 drain the liquid hydrocarbons, and the output 62by gas from the inlet of the expander 7.

The operation is as follows.

Oil (or natural) gas from a gas source (not shown) in the suction line 1 through the control valves 8 and 9 and the first circuit 51the heat exchanger 5 is fed to the input device 2 to increase or decrease the pressure, where it is mixed with the incoming to the other input of the cleaned and cooled gas from the output of the expander 7. The mixture with the desired pressure is fed to the input 101the vortex tube 10.

In the vortex tube 10, the gas is subjected to vortex separation on a cold (102) and hot (103streams.

Cold stream (line 102contains a percentage more light fractions and has a relatively low temperature, so that it is suitable for use as a cooling agent in the heat exchanger 5 and further transportation through the pipeline to the consumer through the discharge pipe 3. Passing pin is ru 5 2the heat exchanger 5, cold flow, on the one hand, cools the pipeline circuit 52this heat exchanger through which passes the hot gas flow, thereby facilitating the allocation process (condensation) of this gas heavy fractions of hydrocarbons in the separator 6, and on the other hand, cools the pipeline circuit 51the specified heat exchanger through which passes the source gas (or part thereof). This is necessary to ensure that the gas entering the vortex tube 10, is guaranteed provided the lowest component of the T•ΔSR(where ΔSR- component of the entropy, T is the gas temperature at the inlet of the second vortex tube). For this purpose, by means of regulating valves 8 and 9, the source gas is either completely passed through the circuit 51the heat exchanger 5, either in part or send in violation of this circuit. It all depends on the temperature of the source gas supplied to the plant for receiving gas line 1.

Hot thread with output 103the vortex tube 10 contains a percentage more heavy fractions and impurities, the most convenient for condensation in the separator 6. This stream passes through the circuit 53the heat exchanger 5 where it is cooled to the temperature required to move heavy fractions of hydrocarbons in the liquid state, and is supplied to the separator 6, where the implementation of which is the allocation of these liquid hydrocarbons, who with his exit 61enter in a line of 4 removal of liquid hydrocarbons.

Remaining after this allocation of liquid hydrocarbons of the gas mentioned hot thread with release 62separator 6 to the input of the expander 7, in which due to the expansion gas is cooled. Cleared and the cooled gas from the output of the expander 7 is supplied to one of inputs of the device 2 where it is mixed with the gas flowing from the admissions gas line 1. Consequently, at the entrance of the vortex tube gas arrives with reduced (as specified within certain limits, provide valves 8 and 9) temperature and lower concentration of heavy fractions of hydrocarbons due to the dilution of the source gas supplied through the selection line 1 depleted in the heavy fractions of the gas flowing from the output of the expander 7.

Installation for the preparation of petroleum or natural gas for transportation through the pipeline and the production of liquid hydrocarbons from the gas containing the receiving gas line, a device for raising or lowering the pressure, flow gas line, drain line liquid hydrocarbons, three-circuit heat exchanger, separator, expander, two control valves and a vortex tube, the entrance of which is through the device to increase or decrease the pressure soy is inen, on the one hand, with the admission of the gas line through the first control valve and connected in series through the second control valve and the first circuit heat exchanger, and on the other hand, output expander output of cold flow of the vortex tube through the second loop heat exchanger is connected with a gas flow line, the output of the hot stream of the vortex tube through the third circuit of the heat exchanger is connected to the inlet of the separator, condensate which is connected to the drain line liquid hydrocarbons, and the output of gas from the inlet of the expander.



 

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