A shale gas metering and separation integrated skid and processing method

Abstract

The present invention relates to the technical field of shale gas production gas pretreatment, and specifically to a shale gas metering and separation integrated skid and a processing method, comprising a separator and a connecting assembly; the connecting assembly comprises an inlet pipe, a gas-liquid two-phase flowmeter, an air inlet pipe, a pressure measuring component, an outlet component and a pressure relief component; the inlet pipe is connected to the separator and is located on one side of the separator, the gas-liquid two-phase flowmeter is connected to the inlet pipe and is located on one side of the inlet pipe, the air inlet pipe is connected to the gas-liquid two-phase flowmeter and is connected to one side of the gas-liquid two-phase flowmeter, the pressure measuring component is connected to the inlet pipe, the outlet component is connected to the separator, and the pressure relief component is connected to the separator, so that the produced gas from multiple wellheads can share a set of metering and separation devices, which greatly saves equipment investment costs, enables skid-mounted centralized management, and significantly reduces labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of shale gas production pretreatment technology, and in particular to a shale gas metering and separation integrated skid and a treatment method. Background Art

[0002] The natural gas extracted from the shale wellhead needs to be pre-processed through processes such as collection, metering, and gas-liquid separation before being transported to a natural gas processing plant for further processing.

[0003] However, the above method generally requires a wellhead to be equipped with a gas-liquid separation device. After gas-liquid separation, the gas and liquid are measured separately. The gas volume produced at the wellhead is converted according to the gas volume after separation. The independent metering and separation units are complicated and inconvenient to manage. Summary of the Invention

[0004] The purpose of the present invention is to provide a shale gas metering and separation integrated skid and processing method, which can share a set of metering and separation devices for the produced gas from multiple wellheads, accurately measure the produced gas volume and the processed gas output volume of each wellhead, greatly saving equipment investment costs, and centralized skid management, and significantly reducing labor costs.

[0005] To achieve the above-mentioned object, the present invention provides a shale gas metering and separation integrated skid and processing method, comprising a separator and a connecting assembly;

[0006] The connecting assembly includes an inlet pipe, a gas-liquid two-phase flowmeter, an air intake pipe, a pressure measuring component, an outlet component and a pressure relief component; the inlet pipe is connected to the separator and is located on one side of the separator, the gas-liquid two-phase flowmeter is connected to the inlet pipe and is located on one side of the inlet pipe, the air intake pipe is connected to the gas-liquid two-phase flowmeter and is connected to one side of the gas-liquid two-phase flowmeter, the pressure measuring component is connected to the inlet pipe, the outlet component is connected to the separator, and the pressure relief component is connected to the separator.

[0007] Wherein, the pressure measuring component includes a pressure transmitter and a pressure gauge, the pressure transmitter is connected to the inlet pipe and is located on one side of the inlet pipe; the pressure gauge is connected to the pressure transmitter and is located on one side of the pressure transmitter.

[0008] Wherein, the outlet component includes a liquid outlet pipe, a connecting pipe, a steam trap, an electromagnetic flowmeter and an exhaust component, the liquid outlet pipe is connected to the separator and is located on one side of the separator; the connecting pipe is connected to the separator and is located on one side of the separator; the steam trap is connected to the connecting pipe and to the liquid outlet pipe; the electromagnetic flowmeter is connected to the liquid outlet pipe and is located on one side of the liquid outlet pipe; the exhaust component is connected to the separator.

[0009] The pressure relief component includes a vent pipe and a safety valve. The vent pipe is connected to the separator and is located on one side of the separator. The safety valve is connected to the vent pipe and is located on one side of the vent pipe.

[0010] Wherein, the exhaust components include an exhaust pipe, a steam trap balancing gas pipe and an orifice flowmeter. The exhaust pipe is connected to the separator and is located on one side of the separator; the steam trap balancing gas pipe is connected to the steam trap and to the separator; the orifice flowmeter is connected to the exhaust pipe and is located on one side of the exhaust pipe.

[0011] The present invention provides a shale gas metering and separation integrated skid and processing method. After the produced gas from multiple wellheads is preliminarily metered for gas and liquid on a single wellhead through the provided gas-liquid two-phase flowmeter, the provided gas inlet pipeline is merged into two mutually standby introduction pipelines, and then enters two mutually standby separators for gas-liquid separation. The separated natural gas and water are metered and enter the corresponding pipelines respectively to enter the next process. After the produced gas (wet gas) from a single wellhead is measured for gas and liquid flow by a single gas-liquid two-phase flowmeter, it is merged into the introduction pipeline and then enters the two separators for gas-liquid separation. After passing through the two separators, The separated gas enters the exhaust pipe and is measured by the orifice flowmeter before being transported out; the liquid separated from the separator enters the sewage main through the liquid outlet pipe and is transported to the sewage system after being measured by the electromagnetic flowmeter. A vent is provided on the top of the two separators, and a safety valve, a throttling stop vent valve, etc. Overpressure relief and manual venting will be transported from the vent main to the vent riser for centralized treatment, realizing a common set of metering and separation devices for produced gas from multiple wellheads, and accurately measuring the produced gas volume and the treated gas volume for external transmission from each wellhead, which greatly saves equipment investment costs, and skid-mounted centralized management also greatly reduces labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0013] Figure 1It is a schematic structural diagram of the shale gas metering and separation integrated skid as a whole according to the first embodiment of the present invention.

[0014] Figure 2 This is a flow chart of a shale gas metering and separation integrated skid processing method provided by the present invention.

[0015] In the figure: 101-separator, 102-inlet pipe, 103-gas-liquid two-phase flowmeter, 104-air inlet pipe, 105-pressure transmitter, 106-pressure gauge, 107-liquid outlet pipe, 108-connecting pipe, 109-steam trap, 110-electromagnetic flowmeter, 111-vent pipe, 112-safety valve, 113-exhaust pipe, 114-steam trap balancing gas pipe, 115-orifice flowmeter. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0017] The first embodiment of this application is:

[0018] See also Figure 1 ,in Figure 1 It is a schematic diagram of the overall structure of the shale gas metering and separation integrated skid.

[0019] The present invention provides an integrated shale gas metering and separation skid, comprising a separator 101 and a connecting assembly, wherein the connecting assembly comprises an inlet pipe 102, a gas-liquid two-phase flowmeter 103, an air inlet pipe 104, a pressure measuring component, an outlet component and a pressure relief component, wherein the pressure measuring component comprises a pressure transmitter 105 and a pressure gauge 106, the outlet component comprises a liquid outlet pipe 107, a connecting pipe 108, a steam trap 109, an electromagnetic flowmeter 110 and an exhaust component, the pressure relief component comprises a vent pipe 111 and a safety valve 112, and the exhaust component comprises an exhaust pipe 113, a steam trap balancing gas pipe 114 and an orifice flowmeter 115. The above-mentioned solution solves the problem that a wellhead generally needs to be equipped with a set of gas-liquid separation devices, the gas and liquid are measured separately after separation, the wellhead gas production volume is converted according to the gas volume after separation, and the independent metering and separation units have relatively complicated equipment and are inconvenient to manage.

[0020] In this embodiment, the separator 101 is an existing device for gas-liquid separation, and the separator 101 can be used to separate the introduced gas into a gas-liquid state.

[0021] The inlet pipe 102 is connected to the separator 101 and is located on one side of the separator 101. The gas-liquid two-phase flowmeter 103 is connected to the inlet pipe 102 and is located on one side of the inlet pipe 102. The air intake pipe 104 is connected to the gas-liquid two-phase flowmeter 103 and is connected to one side of the gas-liquid two-phase flowmeter 103. The pressure measuring component is connected to the inlet pipe 102, the outlet component is connected to the separator 101, the pressure relief component is connected to the separator 101, and the air intake pipe 104 is connected to the external single wellhead air inlet. The inlet pipe 102 is connected to the inlet of the separator 101. The gas-liquid two-phase flowmeter 103 is provided at the connection between the inlet pipe 102 and the air intake pipe 104. The gas-liquid two-phase flowmeter 103 can be used to perform corresponding separate measurement on the incoming gas transmitted in the air intake pipe 104, and then introduce it into the inlet pipe 102. The separator 101 and the inlet pipe 102 are each provided with two groups, and the air intake pipe 104 is installed one-to-one corresponding to the number of single wellheads, and the gas-liquid two-phase flowmeter 103 is also provided one-to-one corresponding to the air intake pipe 104.

[0022] Secondly, the pressure transmitter 105 is connected to the inlet pipe 102 and is located on one side of the inlet pipe 102; the pressure gauge 106 is connected to the pressure transmitter 105 and is located on one side of the pressure transmitter 105; the vent pipe 111 is connected to the separator 101 and is located on one side of the separator 101; the safety valve 112 is connected to the vent pipe 111 and is located on one side of the vent pipe 111. Each of the inlet pipes 102 is equipped with the pressure transmitter 105 and the pressure gauge 106. The pressure gauge 106 is provided so that the pressure in the inlet pipe 102 can be monitored in real time, so that the inlet pipe 102 can be replaced and maintained in time when a problem occurs. The separator 101 is also provided with the vent pipe 111, and the safety valve 112 is installed on the vent pipe 111. The safety valve 112 can be used to relieve the pressure when the internal pressure of the separator 101 is too high, and the excess gas can be discharged through the vent pipe 111 to ensure the stability of the separator 101 during operation.

[0023] At the same time, the liquid outlet pipe 107 is connected to the separator 101 and is located on one side of the separator 101; the connecting pipe 108 is connected to the separator 101 and is located on one side of the separator 101; the steam trap 109 is connected to the connecting pipe 108 and is connected to the liquid outlet pipe 107; the electromagnetic flowmeter 110 is connected to the liquid outlet pipe 107 and is located on one side of the liquid outlet pipe 107; the exhaust component is connected to the separator 101, the liquid outlet pipe 107 is installed on the liquid outlet provided in the separator 101, the steam trap 109 is connected to the liquid outlet of the separator 101 through the connecting pipe 108, and the electromagnetic flowmeter 110 is also installed on the liquid outlet pipe 107. In this way, when the liquid outlet pipe 107 transmits the liquid discharged from the separator 101, the data can be collected and recorded through the provided electromagnetic flowmeter 110.

[0024] In addition, the exhaust pipe 113 is connected to the separator 101 and is located on one side of the separator 101; the steam trap balancing gas pipe 114 is connected to the steam trap 109 and is connected to the separator 101; the orifice flowmeter 115 is connected to the exhaust pipe 113 and is located on one side of the exhaust pipe 113, the exhaust pipe 113 is connected to the exhaust port of the separator 101, and the orifice flowmeter 115 is installed on the exhaust pipe 113. The steam trap 109 is connected to the air outlet of the separator 101 through the steam trap balancing gas pipe 114 so that In order to separate the water vapor generated in the exhaust gas and thus complete the metering of the exhaust gas, the exhaust pipe 113 is connected to the top of the separator 101 and is located at one end of the separator 101, and the orifice flowmeter 115 is located on the exhaust pipeline; the liquid outlet pipe 107 is connected to the bottom of the separator 101 and is located at one end of the separator 101, and the steam trap 109 and the electromagnetic flowmeter 110 are located on the liquid outlet pipeline; the connecting pipe 108 is connected to the separator 101, and the orifice flowmeter 115, the steam trap 109, the electromagnetic flowmeter 110 and other components are connected according to the gas-liquid pipeline.

[0025] When the shale gas metering and separation integrated skid and processing method of this embodiment is used, the produced gas from multiple wellheads is introduced into two mutually standby inlet pipes 102 through the provided inlet pipe 104, and then enters the two mutually standby separators 101 for gas-liquid separation. The separated natural gas and water are metered and enter the corresponding pipelines respectively to enter the next process. After the produced gas (wet gas) from a single wellhead passes through a single gas-liquid two-phase flowmeter 103 to measure the gas phase and liquid phase flow respectively, it is introduced into the inlet pipe 102, and then enters the two separators 101 for gas-liquid separation. The gas separated by the two separators 101 enters the The exhaust pipe 113 is measured by the orifice flowmeter 115 and then the gas is transported out; the liquid separated from the separator 101 enters the sewage main pipe through the liquid outlet pipe 107, and is transported to the sewage system after being measured by the electromagnetic flowmeter 110. The tops of the two separators 101 are provided with vents, safety valves 112, throttling stop vent valves, etc. Overpressure relief and manual venting will be transported from the vent main pipe to the vent riser for centralized processing, realizing the use of a set of metering and separation devices for the produced gas from multiple wellheads, and accurately measuring the produced gas volume and the treated gas volume for external transmission from each wellhead, which greatly saves the equipment investment cost, and the skid-mounted centralized management also greatly reduces the labor cost.

[0026] Second embodiment:

[0027] See also Figure 2 A shale gas metering and separation integrated skid processing method includes the following steps.

[0028] S1: The gas produced from the wellhead is directly fed into the separator 101 after single-port gas-liquid metering, and the gas-liquid separation is completed by the separator 101;

[0029] The specific method of gas-liquid separation in the separator 101 is:

[0030] S101: First, the produced gas is introduced into the provided gas-liquid two-phase flowmeter 103 through the gas inlet pipe 104 for corresponding measurement;

[0031] S102: The measured gas enters the separator 101 through the provided inlet pipe 102;

[0032] S103: Finally, the separator 101 is used to separate the gas transmitted from the inlet pipe 102 into gas and liquid.

[0033] S2: The separated natural gas and water are discharged through the corresponding outlet of the separator 101 and then measured accordingly;

[0034] The specific method for metering the natural gas and water discharged from the separator 101 is:

[0035] S201: The natural gas and water discharged from the separator 101 are discharged through the exhaust pipe 113 and the liquid outlet pipe 107 respectively;

[0036] S202: When the separated natural gas is discharged, the exhaust pipe 113 at the top of the separator 101 is measured by the orifice flowmeter 115 on the pipeline and then transported to the gas transmission network; when the separated water is discharged, the steam trap 109 is connected to the bottom of the separator 101 through the connecting pipe 108 to promptly discharge the accumulated liquid at the bottom of the separator. The steam trap balance gas pipe 114 is connected to the gas phase space of the separator 101 to ensure the normal operation of the steam trap;

[0037] S203: The gas and liquid discharged through the exhaust pipe 113 and the liquid outlet pipe 107 are respectively measured by the orifice flowmeter 115 and the electromagnetic flowmeter 110 provided on the corresponding pipes.

[0038] S3: Finally, the measured gas and liquid are transported to the corresponding gas transmission network and sewage system through the exhaust pipe 113 and the liquid outlet pipe 107, thereby completing the entire separation, metering and transportation operations.

[0039] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A shale gas metering and separation integrated skid, comprising a separator, characterized in that: Also included are connection components; The connecting assembly includes an inlet pipe, a gas-liquid two-phase flowmeter, an air inlet pipe, a pressure measuring component, an outlet component, and a pressure relief component; the inlet pipe is connected to the separator and is located on one side of the separator, the gas-liquid two-phase flowmeter is connected to the inlet pipe and is located on one side of the inlet pipe, the air inlet pipe is connected to the gas-liquid two-phase flowmeter and is connected to one side of the gas-liquid two-phase flowmeter, the pressure measuring component is connected to the inlet pipe, the outlet component is connected to the separator, and the pressure relief component is connected to the separator; The pressure measuring component includes a pressure transmitter and a pressure gauge, wherein the pressure transmitter is connected to the inlet pipe and is located on one side of the inlet pipe; the pressure gauge is connected to the pressure transmitter and is located on one side of the pressure transmitter; The outlet component includes a liquid outlet pipe, a connecting pipe, a steam trap, an electromagnetic flowmeter and an exhaust component. The liquid outlet pipe is connected to the separator and is located on one side of the separator; the connecting pipe is connected to the separator and is located on one side of the separator; the steam trap is connected to the connecting pipe and to the liquid outlet pipe; the electromagnetic flowmeter is connected to the liquid outlet pipe and is located on one side of the liquid outlet pipe; and the exhaust component is connected to the separator.

2. The shale gas metering and separation integrated skid according to claim 1, characterized in that: The pressure relief component includes a vent pipe and a safety valve. The vent pipe is connected to the separator and is located at one side of the separator; the safety valve is connected to the vent pipe and is located at one side of the vent pipe.

3. The shale gas metering and separation integrated skid according to claim 1, characterized in that: The exhaust component includes an exhaust pipe, a steam trap balancing gas pipe and an orifice flowmeter. The exhaust pipe is connected to the separator and is located on one side of the separator; the steam trap balancing gas pipe is connected to the steam trap and to the separator; the orifice flowmeter is connected to the exhaust pipe and is located on one side of the exhaust pipe.

4. A shale gas metering and separation integrated skid processing method, using the shale gas metering and separation integrated skid as claimed in claim 3, characterized in that: The following steps are included: The gas produced from the wellhead is directly fed into the separator after single-port gas-liquid metering, and the gas-liquid separation is completed through the separator; The separated natural gas and water are discharged through the corresponding discharge ports of the separator and then measured accordingly; Finally, the measured gas and liquid are transported to the corresponding gas transmission network and sewage discharge system through the exhaust pipe and the liquid outlet pipe, thereby completing the entire separation, metering and transportation operation.

5. The shale gas metering and separation integrated skid processing method according to claim 4, characterized in that: The specific method of gas-liquid separation in the separator is: First, the produced gas is introduced into the provided gas-liquid two-phase flow meter through the gas inlet pipeline for corresponding measurement; The metered gas then enters the separator through the provided inlet pipe; Finally, the separator is used to separate the gas transmitted from the inlet pipeline into gas and liquid.

6. The shale gas metering and separation integrated skid processing method according to claim 5, characterized in that: The specific method for metering the natural gas and water discharged from the separator is: The natural gas and water discharged from the separator are discharged through the exhaust pipe and the liquid outlet pipe respectively; When the separated natural gas is discharged, the exhaust pipe on the top of the separator is measured by the orifice flowmeter on its pipeline and then transported to the gas transmission network; when the separated water is discharged, the steam trap is connected to the bottom of the separator through the connecting pipe to discharge the accumulated liquid at the bottom of the separator in time. The balance gas pipe of the steam trap is connected to the gas phase space of the separator, ensuring that the steam trap can work normally; The gas and liquid discharged through the exhaust pipe and the liquid outlet pipe are respectively measured by the orifice flowmeter and the electromagnetic flowmeter provided on the corresponding pipes.

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