Fire flooding oilfield oil and gas gathering and processing system and processing process

Abstract

The application provides a fire flooding oilfield oil and gas gathering and transportation processing system and a processing technology. The fire flooding oilfield oil and gas gathering and transportation processing system comprises an oil and gas collecting unit, an oil collecting pipeline and a gas collecting pipeline connected with a Christmas tree, the oil collecting pipeline is connected with an oil collecting manifold, the gas collecting pipeline is connected with a gas collecting manifold and a water mixing system, and a first communication pipeline is connected between the oil collecting pipeline and the gas collecting pipeline; and the oil and gas processing unit comprises a gas-liquid separator connected with the oil collecting manifold and a production separator connected with the gas collecting manifold, and a second communication pipeline is connected between an inlet of the gas-liquid separator and an inlet of the production separator. The application solves the problems of high investment cost and large occupied area caused by the need of separately arranging a water mixing pipeline and a large number of gas-liquid separation processing devices in the fire flooding oilfield gathering and transportation processing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas gathering and processing, and particularly relates to a fire flooding oilfield oil and gas gathering and processing system and a processing process. BACKGROUND

[0002] The development of heavy oil fields is generally divided into three mining methods: huff and puff and steam flooding, steam assisted gravity drainage and fire flooding. The fire flooding process is to ignite the crude oil in the underground oil layer through a wellhead bottom ignition device, and at the same time, air is injected into the oil layer. The viscosity of heavy oil is continuously reduced by the heat released from the burning of the crude oil in the underground oil layer, and the heavy oil is produced by the oil pump. The oil recovery rate can reach about 60%. The fire flooding process is suitable for the secondary development of old areas in heavy oil fields. Fire flooding is the earliest thermal oil recovery technology used for developing heavy oil. With the development of fire flooding oil field development technology, the oil and gas processing process of fire flooding oil field station has become more and more important. The current conventional oil and gas gathering and processing process directly applied in fire flooding oil field has the following problems:

[0003] 1. For the oil wellhead temperature, water mixing and series connection oil gathering, wellhead heating and series connection oil gathering can be used for gathering and transportation. When the oil wellhead temperature is high, single pipe series connection oil gathering can be used. However, water mixing or heating gathering and transportation is used in the early stage of fire flooding, and water mixing pipeline and heating equipment are not used after the effect of fire flooding, which causes idle equipment and waste of investment.

[0004] 2. According to the requirements of "Oil and Gas Gathering and Transportation Design Specification" (GB50350-2015), the number of oil and gas separators for continuous production should not be less than 2. Oil tube liquid needs to be set at least 2 gas-liquid separators for separation, and casing gas needs to be set 1 production separator for gas phase liquid removal.

[0005] 3. For the gas phase carrying liquid, air cooler, water cooling heat exchanger and oil removal device are generally used for condensation separation process. However, for the heavy oil produced by fire flooding development, the viscosity is large, and the use of air cooler or heat exchanger has the problem of blockage caused by the attachment of crude oil to the heat exchange pipe. SUMMARY

[0006] The purpose of the present application is to provide a fire flooding oilfield oil and gas gathering and processing system and a processing process, which solves the problems of high investment cost and large occupied area caused by the need for separate water mixing pipeline and more gas-liquid separation processing equipment in the process of fire flooding oilfield gathering and processing.

[0007] In one aspect, the present application provides a fire flooding oilfield oil and gas gathering and processing system, which comprises:

[0008] An oil and gas collection unit having an oil collection line connected to a Christmas tree and a gas collection line connected to a gas collection header and a water injection system, a first communication line connecting the oil collection line and the gas collection line;

[0009] An oil and gas processing unit having a gas-liquid separator connected to the oil collection header and a production separator connected to the gas collection header, a second communication line connecting an inlet of the gas-liquid separator and an inlet of the production separator.

[0010] In a preferred embodiment of the present application, a gas phase outlet of the gas-liquid separator and a gas phase outlet of the production separator are connected to a secondary separator through a gas phase line.

[0011] In a preferred embodiment of the present application, the gas phase line is provided with a cooling device having a cooling water jacket pipe sleeved on the gas phase line, and cooling water is circulated in the cooling water jacket pipe.

[0012] In a preferred embodiment of the present application, a liquid phase outlet of the gas-liquid separator and a liquid phase outlet of the production separator are connected to a crude oil dehydration system through a liquid phase line.

[0013] In a preferred embodiment of the present application, a discharge outlet of the gas-liquid separator and a discharge outlet of the production separator are connected to a venting device through a venting line.

[0014] In a preferred embodiment of the present application, a liquid phase outlet of the gas-liquid separator, a liquid phase outlet of the production separator and a liquid phase outlet of the secondary separator are connected to a crude oil dehydration system through a liquid phase line.

[0015] In a preferred embodiment of the present application, a discharge outlet of the gas-liquid separator, a discharge outlet of the production separator and a discharge outlet of the secondary separator are connected to a venting device through a venting line.

[0016] In a preferred embodiment of the present application, a gas phase outlet of the secondary separator is connected to a gas processing system.

[0017] In a preferred embodiment of the present application, a safety valve is provided at each of the discharge outlet of the gas-liquid separator, the discharge outlet of the production separator and the discharge outlet of the secondary separator.

[0018] In a preferred embodiment of the present application, a gas phase self-operated regulating valve is provided at each of the gas phase outlet of the gas-liquid separator, the gas phase outlet of the production separator and the gas phase outlet of the secondary separator.

[0019] In a preferred embodiment of the present application, an electrically operated liquid phase regulating valve is arranged at the liquid phase outlet of the gas-liquid separator, the liquid phase outlet of the production separator and the liquid phase outlet of the secondary separator.

[0020] In a preferred embodiment of the present application, a pressure transmitter, a first temperature transmitter, a first check valve and a sampling stop valve are arranged on the oil gathering pipeline and the gas gathering pipeline.

[0021] In a preferred embodiment of the present application, a second check valve and a first switch valve are arranged on the first communication pipeline.

[0022] In a preferred embodiment of the present application, a second switch valve is arranged on the oil gathering pipeline between the oil gathering manifold and the first communication pipeline, and a third switch valve is arranged on the gas gathering pipeline between the Christmas tree and the first communication pipeline.

[0023] In a preferred embodiment of the present application, a second temperature transmitter is arranged at each end of the gas phase pipeline.

[0024] In a preferred embodiment of the present application, a cooling water passage is formed in the cooling water jacket around the gas phase pipeline, and a cooling water inlet pipe and a cooling water outlet pipe are connected to opposite ends of the cooling water passage.

[0025] In a preferred embodiment of the present application, a third communication pipeline is connected between the cooling water inlet pipe and the cooling water outlet pipe, and a fourth switch valve is arranged on the third communication pipeline.

[0026] In another aspect, the present application also provides a fire-flood oilfield oil and gas gathering and processing process, which comprises:

[0027] In the early stage of development of the fire-flood oilfield, part of the gas gathering pipeline connected to the Christmas tree is closed and used as a water mixing pipeline, and water is mixed into the oil gathering pipeline through the first communication pipeline connected between the gas gathering pipeline and the oil gathering pipeline to increase the temperature at the wellhead.

[0028] After the fire-flood effect is observed, the first communication pipeline is cut off, and the gas gathering pipeline is opened for normal gas gathering operation.

[0029] In a preferred embodiment of the present application, the fire-flood oilfield oil and gas gathering and processing process further comprises:

[0030] When the production separator for processing the gas collected by the gas gathering pipeline needs to be overhauled, the gas is passed into the gas-liquid separator for processing through the second communication pipeline connected between the inlet of the production separator and the inlet of the gas-liquid separator.

[0031] When the gas-liquid separator for treating the liquid collected by the oil gathering pipeline needs to be overhauled, the liquid is passed into the production separator through the second communication pipeline for treatment.

[0032] In a preferred embodiment of the present application, the fire-flood oilfield oil and gas gathering and transportation treatment process further comprises:

[0033] A cooling device is arranged on a gas phase pipeline connected with a gas phase outlet of the production separator and a gas phase outlet of the gas-liquid separator, and a cooling water channel is formed in the cooling device to cool the gas in the gas phase pipeline.

[0034] Compared with the prior art, the technical scheme of the present application has the following characteristics and advantages:

[0035] 1. The fire-flood oilfield oil and gas gathering and transportation treatment system and treatment process of the present application can realize the switching between the gas gathering and water mixing functions of the part of the gas gathering pipeline connected with the Christmas tree by using the first communication pipeline to mix water into the oil gathering pipeline to increase the temperature of the wellhead in the early stage of fire-flood development, i.e. using the gas gathering pipeline as the water mixing pipeline in the early stage of fire-flood to solve the problem that the conventional gathering and transportation process is not suitable for the low temperature of the wellhead in the early stage of fire-flood and the high temperature of the wellhead after the decrease of fire-flood.

[0036] 2. When the production separator for treating the gas collected by the gas gathering pipeline needs to be overhauled, the gas is passed into the gas-liquid separator through the second communication pipeline connected between the inlet of the production separator and the inlet of the gas-liquid separator for treatment, i.e. the production separator and the gas-liquid separator are used as each other's backup through the second communication pipeline to solve the problems of large number of gas-liquid separators, high investment and large floor area in the station.

[0037] 3. The gas phase pipeline in the present application is provided with a cooling water jacket pipe, and the cooling water in the cooling water jacket pipe is used to cool the gas, thereby solving the problem of large amount of liquid carried by the gas treatment system and affecting the operation of the gas treatment device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0039] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportions of the various components depicted in the drawings are not intended to be specific limitations of the scope of the present disclosure. Those skilled in the art will recognize that the specific shapes and proportions of the various components can be varied while still remaining within the scope of the present disclosure.

[0040] Figure 1 Structure diagram of oil and gas collecting unit according to the present disclosure;

[0041] Figure 2 Structure diagram of oil and gas processing unit according to the present disclosure;

[0042] Figure 3 Structure diagram of cooling device according to the present disclosure.

[0043] Explanation of reference numerals:

[0044] 10, oil and gas collecting unit; 11, oil collecting pipeline; 12, gas collecting pipeline; 13, water mixing system; 14, pressure transmitter; 15, first temperature transmitter; 16, first check valve; 17, sampling stop valve; 18, second on-off valve; 19, third on-off valve;

[0045] 20, oil and gas processing unit; 21, gas-liquid separator; 22, production separator; 23, gas phase pipeline; 231, self-operated regulating valve; 24, secondary separator; 25, liquid phase pipeline; 251, liquid phase electric regulating valve; 26, venting pipeline; 261, safety valve;

[0046] 30, Christmas tree; 31, oil collecting manifold; 32, gas collecting manifold; 33, crude oil dehydration system; 34, venting device; 35, gas processing system;

[0047] 40, first communication pipeline; 41, second check valve; 42, first on-off valve;

[0048] 50, second communication pipeline;

[0049] 60, cooling device; 61, cooling water jacket pipe; 62, cooling water passage; 63, second temperature transmitter; 64, cooling water inlet pipe; 65, cooling water outlet pipe; 66, third communication pipeline; 661, fourth on-off valve; 67, third temperature transmitter; 68, fifth on-off valve. DETAILED DESCRIPTION

[0050] In order to make the technical solution in the present application better understood by the person skilled in the art, the technical solution in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative work should belong to the protection scope of the present application.

[0051] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and are not intended to be limiting.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] Embodiment one:

[0054] As shown in Figures 1 to 3 The present application provides a fire flooding oilfield oil and gas gathering and transportation processing system, which comprises: an oil and gas collecting unit 10 having an oil collecting pipeline 11 and a gas collecting pipeline 12 connected with an oil tree 30, the oil collecting pipeline 11 being connected with an oil collecting manifold 31, the gas collecting pipeline 12 being connected with a gas collecting manifold 32 and a water mixing system 13, and a first communication pipeline 40 being connected between the oil collecting pipeline 11 and the gas collecting pipeline 12; and an oil and gas processing unit 20 having a gas-liquid separator 21 connected with the oil collecting manifold 31 and a production separator 22 connected with the gas collecting manifold 32, and a second communication pipeline 50 being connected between an inlet of the gas-liquid separator 21 and an inlet of the production separator 22.

[0055] The fire flooding oilfield oil and gas gathering and transportation processing system can be applied to an oilfield using a fire flooding oil production process for oil production, overcomes various problems of a conventional gathering and transportation processing process applied to fire flooding development, and can obtain better economic and social benefits.

[0056] The first communication pipeline 40 is connected between the oil gathering pipeline 11 and the gas gathering pipeline 12 in the application, and the gas gathering pipeline 12 is used as a water mixing pipeline through the first communication pipeline 40 in the early stage of fire flooding, so as to solve the problem that the oil well head temperature is low in the early stage of fire flooding and the oil well head temperature is high after fire flooding, which causes the inadaptation to the conventional gathering process.

[0057] The second communication pipeline 50 is connected between the inlet of the production separator 22 and the inlet of the gas-liquid separator 21 in the application, and the two are used as backup for each other through the second communication pipeline 50, so as to solve the problem that the number of the gas-liquid separators 21 in the station is large, the investment is high, and the land occupation area is large.

[0058] The pipeline connection structure of the oil and gas collecting unit 10, the pipeline connection structure of the oil and gas processing unit 20, and the connection relationship between the two will be further described in detail below.

[0059] Firstly, one end of the oil and gas collecting unit 10 in the application is connected with the Christmas tree 30, that is, connected with the oil well, for collecting and conveying the oil liquid and gas generated in the oil well; the other end of the oil and gas collecting unit 10 is connected with the oil gathering manifold 31 and the gas gathering manifold 32, for gathering the oil liquid collected from the Christmas tree 30 into the oil gathering manifold 31, and gathering the gas collected from the Christmas tree 30 into the gas gathering manifold 32.

[0060] Specifically, as shown in the figure, Figure 1 The oil and gas collecting unit 10 includes the oil gathering pipeline 11 and the gas gathering pipeline 12, the two ends of the oil gathering pipeline 11 are connected with the Christmas tree 30 and the oil gathering manifold 31 respectively, for conveying the oil liquid collected from the oil pipeline into the oil gathering manifold 31. The two ends of the gas gathering pipeline 12 are connected with the Christmas tree 30 and the gas gathering manifold 32 respectively, for conveying the gas collected from the casing into the gas gathering manifold 32.

[0061] Further, the first communication pipeline 40 is connected between the oil gathering pipeline 11 and the gas gathering pipeline 12, and the water mixing system 13 is connected on the gas gathering pipeline 12 between the first communication pipeline 40 and the gas gathering manifold 32. In the early stage of the development of the fire flooding oil field, the oil well head temperature is low (10-20℃), and in order to avoid the freezing of the oil liquid in the oil gathering pipeline 11, water mixing (high temperature water) needs to be carried out in the oil gathering pipeline 11; in the early stage of the development of the fire flooding oil field, the gas gathering pipeline 12 between the first communication pipeline 40 and the Christmas tree 30 is closed, the first communication pipeline 40 is opened, and the gas gathering pipeline 12 between the first communication pipeline 40 and the water mixing system 13 is used as a water mixing pipeline, at this time, part of the gas gathering pipeline 12 and the first communication pipeline 40 form a water mixing pipeline connected with the oil gathering pipeline 11, for conveying high temperature water into the oil gathering pipeline 11, and the water mixing system 13 in the station can supply water for water mixing gathering (the temperature is about 60 degrees).

[0062] In the actual oil and gas gathering and processing station, the fire flooding oilfield oil and gas gathering and processing system has a large number of oil gathering pipelines 11 and gas gathering pipelines 12, each set of parallel oil gathering pipelines 11 and gas gathering pipelines 12 adopts the above setting mode, and the plurality of oil gathering pipelines 11 are connected with the oil gathering manifold 31 to realize oil gathering, and the plurality of gas gathering pipelines 12 are connected with the gas gathering manifold 32 to realize gas gathering.

[0063] According to one embodiment of the present application, as shown in Figure 1 The oil gathering pipeline 11 and the gas gathering pipeline 12 are each provided with a pressure transmitter 14, a first temperature transmitter 15, a first check valve 16 and a sampling stop valve 17. The two pressure transmitters 14 are respectively used for detecting and monitoring the pressure on the oil gathering pipeline 11 and the pressure on the gas gathering pipeline 12; the two first temperature transmitters 15 are respectively used for detecting and monitoring the temperature in the oil gathering pipeline 11 and the temperature in the gas gathering pipeline 12; the two first check valves 16 are respectively used for preventing backflow of oil in the oil gathering pipeline 11 and backflow of gas in the gas gathering pipeline 12; and the two sampling stop valves 17 are respectively used for sampling oil in the oil gathering pipeline 11 and gas in the gas gathering pipeline 12.

[0064] According to one embodiment of the present application, as shown in Figure 1 The first communication pipeline 40 is provided with a second check valve 41 and a first switch valve 42. The second check valve 41 is used for blocking backflow of liquid in the first communication pipeline 40, so as to avoid that the oil in the oil gathering pipeline 11 enters the gas gathering pipeline 12 through the first communication pipeline 40 when water is mixed for gathering and transportation; and the first switch valve 42 is used for controlling opening and closing of the first communication pipeline 40, and in the embodiment, the first switch valve 42 is a gate valve.

[0065] According to one embodiment of the present application, as shown in Figure 1 The oil gathering pipeline 11 is provided with a second switch valve 18, which is located on the oil gathering pipeline 11 between the oil gathering manifold 31 and the first communication pipeline 40; and the gas gathering pipeline 12 is provided with a third switch valve 19, which is located on the gas gathering pipeline 12 between the production tree 30 and the first communication pipeline 40. The second switch valve 18 is used for controlling opening and closing of the oil gathering pipeline 11, and in the embodiment, the second switch valve 18 is a gate valve; and the third switch valve 19 is used for controlling opening and closing of the gas gathering pipeline 12, and in the embodiment, the third switch valve 19 is a ball valve.

[0066] The oil and gas collecting unit 10 in the application in the specific working process, in the early stage of fire drive oil field development, close the third switch valve 19 (ball valve) on the gas collecting pipeline 12, open the first switch valve 42 (gate valve) on the first communication pipeline 40, open the water mixing system 13 in the station, through the gas collecting pipeline 12 and the first communication pipeline 40 to the water mixing in the oil collecting pipeline 11; after the fire drive effect, the wellhead temperature is high, the gas amount is large, the first switch valve 42 (gate valve) on the first communication pipeline 40 is closed, the third switch valve 19 (ball valve) on the gas collecting pipeline 12 is opened, and the gas collecting pipeline 12 carries out normal gas collecting and conveying operation.

[0067] Secondly, as shown in the figure, Figure 2 The oil and gas collecting unit 10 in the application in the specific working process, in the early stage of fire drive oil field development, close the third switch valve 19 (ball valve) on the gas collecting pipeline 12, open the first switch valve 42 (gate valve) on the first communication pipeline 40, open the water mixing system 13 in the station, through the gas collecting pipeline 12 and the first communication pipeline 40 to the water mixing in the oil collecting pipeline 11; after the fire drive effect, the wellhead temperature is high, the gas amount is large, the first switch valve 42 (gate valve) on the first communication pipeline 40 is closed, the third switch valve 19 (ball valve) on the gas collecting pipeline 12 is opened, and the gas collecting pipeline 12 carries out normal gas collecting and conveying operation.

[0068] Specifically, as shown in the figure, Figure 2 The oil collecting manifold 31 is connected with the inlet of the gas-liquid separator 21, and the oil liquid collected in the oil collecting manifold 31 can enter the gas-liquid separator 21 for gas-liquid separation treatment; the gas collecting manifold 32 is connected with the inlet of the production separator 22, and the gas collected in the gas collecting manifold 32 can enter the production separator 22 to remove the liquid phase.

[0069] Further, the inlet of the production separator 22 and the inlet of the gas-liquid separator 21 are connected with the second communication pipeline 50, and the production separator 22 and the gas-liquid separator 21 are used as each other's standby through the second communication pipeline 50. When the production separator 22 needs to be overhauled, the inlet of the production separator 22 is closed, the second communication pipeline 50 is opened, the gas in the gas collecting manifold 32 enters the gas-liquid separator 21 together with the oil liquid in the oil collecting manifold 31 through the second communication pipeline 50 for gas-liquid two-phase separation; when the gas-liquid separator 21 needs to be overhauled, the inlet of the gas-liquid separator 21 is closed, the second communication pipeline 50 is opened, the oil liquid in the oil collecting manifold 31 enters the production separator 22 together with the gas in the gas collecting manifold 32 through the second communication pipeline 50 for gas-liquid two-phase separation.

[0070] According to one embodiment of the application, as shown in the figure, Figure 2As shown, the gas-liquid separator 21 has a gas phase outlet and a liquid phase outlet, wherein the gas phase outlet of the gas-liquid separator 21 is connected with the secondary separator 24 through a gas phase pipeline 23, and the liquid phase outlet of the gas-liquid separator 21 is connected with the crude oil dehydration system 33 through a liquid phase pipeline 25. The production separator 22 has a gas phase outlet and a liquid phase outlet, wherein the gas phase outlet of the production separator 22 is connected with the secondary separator 24 through the gas phase pipeline 23, and the liquid phase outlet of the production separator 22 is connected with the crude oil dehydration system 33 through the liquid phase pipeline 25.

[0071] The secondary separator 24 is used for further gas-liquid two-phase separation treatment of the gas phase (gas) separated by the gas-liquid separator 21 and the production separator 22, so as to improve the removal effect of the liquid phase in the gas; and the crude oil dehydration system 33 can perform dehydration treatment on the liquid phase (oil liquid) separated by the gas-liquid separator 21 and the production separator 22.

[0072] According to one embodiment of the present application, as shown in Figure 2 The secondary separator 24 has a gas phase outlet and a liquid phase outlet, wherein the gas phase outlet of the secondary separator 24 is connected with the gas treatment system 35, and the liquid phase outlet of the secondary separator 24 is connected with the crude oil dehydration system 33 through the liquid phase pipeline 25.

[0073] The gas treatment system 35 can perform further treatment on the gas phase (gas) separated by the secondary separator 24, so as to improve the utilization efficiency of resources; and the crude oil dehydration system 33 can perform dehydration treatment on the liquid phase (oil liquid) separated by the secondary separator 24.

[0074] According to one embodiment of the present application, as shown in Figure 2 The gas-liquid separator 21, the production separator 22 and the secondary separator 24 all have a discharge outlet, and the discharge outlets of the gas-liquid separator 21, the production separator 22 and the secondary separator 24 are connected with the venting device 34 through a venting pipeline 26.

[0075] Under accident conditions, such as downstream pipeline blockage, valve misoperation, fire, etc., the gas in the gas-liquid separator 21, the production separator 22 and the secondary separator 24 can be discharged into the atmosphere through the venting device 34 through the venting pipeline 26, so as to ensure the safety of the entire oil and gas treatment unit 20 during production.

[0076] According to one embodiment of the present application, as shown in Figure 2As shown, a gas phase self-regulating valve 231 is arranged at the gas phase outlet of the gas-liquid separator 21, the gas phase outlet of the production separator 22 and the gas phase outlet of the secondary separator 24. The two gas phase self-regulating valves 231 arranged at the gas phase outlet of the gas-liquid separator 21 and the gas phase outlet of the production separator 22 are arranged on the gas phase pipeline 23, and can adjust the opening degree of the gas phase outlet of the gas-liquid separator 21 and the gas phase outlet of the production separator 22 according to the actual working environment; the gas phase self-regulating valve 231 arranged at the gas phase outlet of the secondary separator 24 is arranged on the pipeline between the secondary separator 24 and the gas treatment system 35, and can adjust the opening degree of the gas phase outlet of the secondary separator 24 according to the actual working environment

[0077] According to one embodiment of the present application, as shown in Figure 2 As shown, a liquid phase electric regulating valve 251 is arranged at the liquid phase outlet of the gas-liquid separator 21, the liquid phase outlet of the production separator 22 and the liquid phase outlet of the secondary separator 24. The three liquid phase electric regulating valves 251 are arranged on the liquid phase pipeline 25, and can adjust the opening degree of the liquid phase outlet of the gas-liquid separator 21, the liquid phase outlet of the production separator 22 and the liquid phase outlet of the secondary separator 24 according to the actual working environment.

[0078] According to one embodiment of the present application, as shown in Figure 2 As shown, a safety valve 261 is arranged at the discharge outlet of the gas-liquid separator 21, the discharge outlet of the production separator 22 and the discharge outlet of the secondary separator 24. The three safety valves 261 are arranged on the vent pipeline 26, and can control the opening and closing of the vent pipeline 26 according to the actual working environment.

[0079] According to one embodiment of the present application, as shown in Figure 2 and Figure 3 As shown, a cooling device 60 is arranged on the gas phase pipeline 23, and the cooling device 60 has a cooling water jacket 61 sleeved on the gas phase pipeline 23, and cooling water is passed through the cooling water jacket 61.

[0080] In the present application, the gas phase pipeline 23 is externally provided with the cooling water jacket 61, and the gas in the gas phase pipeline 23 is cooled by the cooling water in the cooling water jacket 61, thereby solving the problem that the gas treatment system 35 carries a large amount of liquid, which further affects the operation of the gas treatment system 35.

[0081] Specifically, as shown in Figure 3As shown, a cooling water jacket 61 is fitted over the gas phase pipeline 23, forming an annular cooling water channel 62 between them. The flow direction of the cooling water in the cooling water channel 62 is opposite to the flow direction of the gas in the gas phase pipeline 23. Cooling water inlet pipe 64 and cooling water outlet pipe 65 are connected to opposite ends of the cooling water channel 62, respectively. In a specific embodiment of the invention, the length of the cooling water jacket 61 is set to 20m. Cooling water at a temperature of 20°C flows through the cooling water inlet pipe 64. After passing through the cooling water channel 62, the cooling water enters the cooling water outlet pipe 65 at a temperature of 40°C. The gas in the gas phase pipeline 23 cools from 60°C to 45°C after passing through the cooling water jacket 61, and condensate is precipitated in the gas phase pipeline 23. The condensate is then removed in the secondary separator 24.

[0082] According to one embodiment of the present invention, such as Figure 3 As shown, the gas phase pipeline 23 is equipped with a second temperature transmitter 63 at both ends of the cooling device 60. The two second temperature transmitters 63 installed at both ends of the cooling water jacket 61 can detect and monitor the temperature of the gas before and after the gas in the gas phase pipeline 23.

[0083] According to one embodiment of the present invention, Figure 3 As shown, a third connecting line 66 connects the cooling water inlet pipe 64 and the cooling water outlet pipe 65, and a fourth switching valve 661 is installed on the third connecting line 66. The temperature of the cooling water entering the cooling water in the cooling water inlet pipe 64 is adjusted through the third connecting line 66. When the temperature in the cooling water inlet pipe 64 is lower than the freezing point of crude oil, the opening of the fourth switching valve 661 is opened or increased, allowing some of the cooling water in the cooling water outlet pipe 65 to flow into the cooling water inlet pipe 64, thereby raising the temperature of the cooling water entering the cooling water above the freezing point of crude oil and preventing the oil from solidifying in the vapor phase pipeline 23 due to excessively low cooling water temperature in the cooling water inlet pipe 64.

[0084] According to one embodiment of the present invention, such as Figure 3 As shown, a fifth temperature transmitter is installed on both the cooling water inlet pipe 64 and the cooling water outlet pipe 65. The fifth temperature transmitter on the cooling water inlet pipe 64 can detect and monitor the temperature of the cooling water entering the pipe; the fifth temperature transmitter on the cooling water outlet pipe 65 can detect and monitor the temperature of the cooling water exiting the pipe.

[0085] Implementation Method Two:

[0086] like Figures 1 to 3 As shown, the present invention also provides a process for oil and gas gathering and transportation in fire-driven oilfields, comprising:

[0087] S1: in the early stage of the fire flooding oilfield development, a part of the gas gathering pipeline 12 connected with the Christmas tree 30 is closed and used as a water mixing pipeline, and water is mixed into the oil gathering pipeline 11 through the first communication pipeline 40 connected between the gas gathering pipeline 12 and the oil gathering pipeline 11 to increase the temperature of the wellhead;

[0088] S2: after the fire flooding takes effect, the first communication pipeline 40 is cut off, and the gas gathering pipeline 12 is opened for normal gas gathering operation.

[0089] The fire flooding oilfield oil and gas gathering and transportation treatment process provided by the application uses the gas gathering pipeline 12 as a water mixing pipeline in the early stage of the fire flooding, and solves the problem that the conventional gathering and transportation process is not suitable for the low wellhead temperature in the early stage of the fire flooding and the high wellhead temperature after the fire flooding is reduced.

[0090] Specifically, in step S1, as shown in the figure, Figure 1 the wellhead temperature is low (10-20℃) in the early stage of the fire flooding oilfield development, the third switch valve 19 (ball valve) on the gas gathering pipeline 12 is closed, the first switch valve 42 (gate valve) on the first communication pipeline 40 is opened, the gas gathering pipeline 12 is used as a water mixing pipeline in the early stage, the water (60℃) in the water mixing system 13 in the station is mixed into the oil gathering pipeline 11 through the gas gathering pipeline 12 and the first communication pipeline 40, water mixing and oil gathering are realized, and the temperature of the oil pipe produced oil in the oil gathering pipeline 11 is 3-5℃ higher than the freezing point.

[0091] In step S2, after the fire flooding takes effect, the wellhead temperature becomes high (40-50℃), the gas volume becomes large, the oil gathering pipeline 11 meets the requirement of non-heating gathering and transportation, the first switch valve 42 on the first communication pipeline 40 is closed, the third switch valve 19 on the gas gathering pipeline 12 is opened, and the water mixing pipeline is switched to the gas gathering pipeline 12.

[0092] According to one embodiment of the application, as shown in the figure, Figure 2 the fire flooding oilfield oil and gas gathering and transportation treatment process further comprises: when the production separator 22 used for treating the gas collected by the gas gathering pipeline 12 needs to be overhauled, the gas is passed into the gas-liquid separator 21 for treatment through the second communication pipeline 50 connected between the inlet of the production separator 22 and the inlet of the gas-liquid separator 21; and when the gas-liquid separator 21 used for treating the liquid collected by the oil gathering pipeline 11 needs to be overhauled, the liquid is passed into the production separator 22 for treatment through the second communication pipeline 50.

[0093] The production separator 22 and the gas-liquid separator 21 in the fire flooding oilfield oil and gas gathering and transportation treatment process provided by the application are used as backups for each other, and solve the problems of a large number of gas-liquid separators 21 in the station, high investment, and large occupied area.

[0094] Specifically, when the production separator 22 needs to be overhauled, the inlet of the production separator 22 is closed, the second communication pipeline 50 is opened, and the gas in the gas collection manifold 32 enters the gas-liquid separator 21 together with the oil in the oil collection manifold 31 to perform gas-liquid two-phase separation; when the gas-liquid separator 21 needs to be overhauled, the inlet of the gas-liquid separator 21 is closed, the second communication pipeline 50 is opened, and the oil in the oil collection manifold 31 enters the production separator 22 together with the gas in the gas collection manifold 32 to perform gas-liquid two-phase separation.

[0095] According to one embodiment of the present application, as shown in Figure 3 The fire-flood oilfield oil and gas gathering and transportation treatment process further includes: a cooling device 60 is arranged on a gas phase pipeline 23 connected with the gas phase outlet of the production separator 22 and the gas phase outlet of the gas-liquid separator 21, and a cooling water channel 62 that surrounds the gas phase pipeline 23 and can cool the gas in the gas phase pipeline 23 is formed in the cooling device 60.

[0096] The fire-flood oilfield oil and gas gathering and transportation treatment process of the present application sets a cooling water jacket 61 outside the gas phase pipeline 23, and the gas in the gas phase pipeline 23 is cooled by the cooling water in the cooling water jacket 61, thereby solving the problem that the gas treatment system 35 carries a large amount of liquid, which further affects the operation of the gas treatment system 35.

[0097] Specifically, the cooling water jacket 61 is sleeved outside the gas phase pipeline 23, and a cylindrical cooling water channel 62 is formed between the two. The flow direction of the cooling water in the cooling water channel 62 is opposite to the flow direction of the gas in the gas phase pipeline 23, and the opposite ends of the cooling water channel 62 are respectively connected with a cooling water inlet pipe 64 and a cooling water outlet pipe 65. The cooling water in the cooling water channel 62 exchanges heat with the gas in the gas phase pipeline 23, the gas in the gas phase pipeline 23 is cooled and condensate is precipitated, and then enters the secondary separator 24 to remove the condensate.

[0098] The above-described specific embodiments further detail the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A fire-driven oilfield oil and gas gathering, transportation, and processing system, characterized in that, include: An oil and gas collection unit has an oil collection pipeline and a gas collection pipeline connected to the wellhead. The oil collection pipeline is connected to an oil collection manifold, and the gas collection pipeline is connected to the gas collection manifold and a water mixing system. A first connecting pipeline connects the oil collection pipeline and the gas collection pipeline. The oil and gas processing unit has a gas-liquid separator connected to the oil collection manifold and a production separator connected to the gas collection manifold, and a second connecting pipeline is connected between the inlet of the gas-liquid separator and the inlet of the production separator. The gas phase outlet of the gas-liquid separator and the gas phase outlet of the production separator are connected to the secondary separator via a gas phase pipeline. A cooling device is provided on the gas phase pipeline. The cooling device has a cooling water sleeve sleeved on the gas phase pipeline, and cooling water flows through the cooling water sleeve. The first connecting pipeline is equipped with a second check valve and a first switching valve; A second switching valve is provided on the oil gathering pipeline, and the second switching valve is located on the oil gathering pipeline between the oil gathering manifold and the first connecting pipeline; a third switching valve is provided on the gas gathering pipeline, and the third switching valve is located on the gas gathering pipeline between the wellhead and the first connecting pipeline.

2. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The liquid phase outlet of the gas-liquid separator and the liquid phase outlet of the production separator are connected to the crude oil dehydration system via liquid phase pipelines.

3. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1 or 2, characterized in that, The discharge outlets of the gas-liquid separator and the production separator are connected to the venting device via venting pipelines.

4. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The liquid phase outlet of the gas-liquid separator, the liquid phase outlet of the production separator, and the liquid phase outlet of the secondary separator are connected to the crude oil dehydration system via liquid phase pipelines.

5. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1 or 4, characterized in that, The discharge outlets of the gas-liquid separator, the production separator, and the secondary separator are connected to the venting device via venting pipelines.

6. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The gas phase outlet of the secondary separator is connected to the gas treatment system.

7. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, Safety valves are provided at the discharge outlets of the gas-liquid separator, the production separator, and the secondary separator.

8. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The gas phase self-regulating valve is provided at the gas phase outlet of the gas-liquid separator, the gas phase outlet of the production separator, and the gas phase outlet of the secondary separator.

9. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The liquid phase outlet of the gas-liquid separator, the liquid phase outlet of the production separator, and the liquid phase outlet of the secondary separator are all equipped with electric liquid phase regulating valves.

10. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, Both the oil collecting pipeline and the gas collecting pipeline are equipped with a pressure transmitter, a first temperature transmitter, a first check valve, and a sampling shut-off valve.

11. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The gas phase pipeline is equipped with a second temperature transmitter at each end of the cooling device.

12. The oil and gas gathering and processing system for fire-driven oilfields according to claim 1, characterized in that, The cooling water jacket has a cooling water channel surrounding the vapor phase pipeline, and the two ends of the cooling water channel are respectively connected to a cooling water inlet pipe and a cooling water outlet pipe.

13. The oil and gas gathering and processing system for fire-driven oilfields according to claim 12, characterized in that, A third connecting pipeline is connected between the cooling water inlet pipe and the cooling water outlet pipe, and a fourth switching valve is provided on the third connecting pipeline.

14. A process for gathering and processing oil and gas in a fire-driven oilfield, implemented using the oil and gas gathering and processing system for a fire-driven oilfield as described in any one of claims 1-13, characterized in that, include: In the early stages of fire-driven oilfield development, a portion of the gas gathering pipeline connected to the wellhead is shut down and used as a water injection pipeline. Water is injected into the oil gathering pipeline through a first connecting pipeline between the gas gathering pipeline and the oil gathering pipeline to increase the wellhead temperature. After the fire-driven operation takes effect, the first connecting pipeline is cut off, and the gas collection pipeline is opened to carry out normal gas collection operations.

15. The oil and gas gathering and transportation process for fire-driven oilfields according to claim 14, characterized in that, Also includes: When the production separator used to process the gas collected by the gas collection line needs maintenance, the gas is introduced into the gas-liquid separator for processing through a second connecting line connected between the inlet of the production separator and the inlet of the gas-liquid separator. When the gas-liquid separator used to process the liquid collected by the oil collection pipeline needs maintenance, the liquid is introduced into the production separator for processing through the second connecting pipeline.

16. The oil and gas gathering and transportation process for fire-driven oilfields according to claim 15, characterized in that, Also includes: A cooling device is installed on the gas phase pipeline connected to the gas phase outlet of the production separator and the gas phase outlet of the gas-liquid separator. The cooling device has a cooling water channel that surrounds the gas phase pipeline and can cool the gas inside the gas phase pipeline.

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