CN112096368B - Unconventional cluster well group oil gas metering and separating system and method thereof - Google Patents
Unconventional cluster well group oil gas metering and separating system and method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 claims abstract description 95
- 238000000926 separation method Methods 0.000 claims abstract description 61
- 239000004576 sand Substances 0.000 claims abstract description 31
- 239000010865 sewage Substances 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 64
- 238000011161 development Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 101100204059 Caenorhabditis elegans trap-2 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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Abstract
The invention provides an unconventional cluster well group oil gas metering and separating system and a method thereof, wherein the cluster well group comprises n wells, the system comprises a wellhead parallel module, a first connecting pipe, a chip catcher, a sand removing device, a depressurization device, a second connecting pipe, a multiphase flowmeter and a separating device, wherein the wellhead parallel module is used for conveying any one of the n wells to the chip catcher; the first connecting pipe is used for conveying the flowback fluid of the n-1 wells to the depressurization device; the dust catcher desanding device can catch and desanding the flowback fluid; the pressure reducing device can reduce the pressure of the flow-back fluid; the second connecting pipe can receive the flow-back fluid in the depressurization device and collect and convey the flow-back fluid to the separation device; the multiphase flowmeter can accurately measure the flowback fluid of the n wells respectively; the separation device can separate the flow-back fluid entering the separation device to obtain sewage, gas and oil. The invention has the advantages of capability of independently metering and intensively separating cluster well groups, reduction of equipment quantity and the like.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploitation, and particularly relates to an unconventional cluster well group oil gas metering and separating system and a method thereof.
Background
At present, unconventional gas reservoir cluster wells such as shale gas gradually form an industrialized fracturing mode of 'integrated deployment and zip-type fracturing'. In order to adapt to an industrial operation mode and achieve the purpose of commercialized development of shale gas, a cluster well group development mode is often adopted, 6 wells are usually deployed on one platform, through continuous exploration in recent years, according to an operation mode of abandoning a traditional process of one well and one group, in consideration of saving field space of equipment, multiple wells share equipment, the number of separators arranged on a single platform is less than that of the well heads, each well adopts a rotation metering mode, two wells and even multiple wells enter a separator at the same time to perform mixed metering, and therefore, the metering of the gas and liquid yield of the single well is influenced to a certain extent. The shale gas reservoir permeability is low, the single well yield is low, the early-stage yield change of the drainage operation is obvious, the probability mode is difficult to master the accurate dynamic yield data of each well of the same platform, the optimization and adjustment of the production system of the later shale gas well and the development of other related research work are extremely unfavorable, and great trouble is brought to the exploitation of oil and gas fields.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, the invention aims to provide an unconventional cluster well group oil gas metering and separating system and an unconventional cluster well group oil gas metering and separating method for solving the technical problems of unreasonable ground flowback flow layout, large metering error and the like of unconventional cluster well groups such as shale gas and the like.
In order to achieve the above objects, in one aspect, the present invention provides an unconventional cluster well group oil and gas metering and separation system. The cluster well group comprises n wells, each of the n wells is used for conveying flowback fluid outwards through a pipeline, and the cluster well group is characterized by comprising a wellhead parallel module, a first connecting pipe, a chip catcher, a sand removing device, a depressurization device, a second connecting pipe, a multiphase flowmeter and a separation device, wherein the wellhead parallel module is respectively connected with outlet pipelines of the n wells, and can be used for conveying the flowback fluid of any one of the n wells to the chip catcher and respectively outputting the flowback fluid of the remaining n-1 wells; one end of the first connecting pipe is connected with the wellhead parallel module, and the other end of the first connecting pipe is connected with the pressure reducing device so as to respectively convey the flowback fluid of the remaining n-1 wells to the pressure reducing device; the chip catcher can receive flowback fluid conveyed by the wellhead parallel module and remove chips in the flowback fluid; the sand removing device is connected with the dust catcher and can remove sand grains and part of solid phase particles in the flowback fluid; the pressure reducing device can respectively receive the flowback fluid of the n-1 wells and reduce the pressure of the flowback fluid in the n-1 wells, and can also receive the flowback fluid passing through the chip catcher and the sand removing device and reduce the pressure of the flowback fluid; one end of the second connecting pipe is connected with the pressure reducing device so as to respectively receive the flowback fluid of the n wells, and the other end of the second connecting pipe can be used for converging the flowback fluid of the n wells and then conveying the flowback fluid to the separating device; the multiphase flow meters are respectively arranged on one end of the second connecting pipe and can respectively accurately meter the flowback fluid of the n wells; the separation device can separate the flow-back fluid entering the separation device to obtain sewage, gas and oil; wherein n is an integer of not less than 2.
In an exemplary embodiment of an aspect of the present invention, the system may further include a sewage tank connected to the separation device, the depressurization device, and the degritting device, respectively, through pipes to receive sewage generated by the separation device, the depressurization device, and the degritting device.
In an exemplary embodiment of an aspect of the present invention, the system may further include a gas delivery skid connected to the separation device through a pipe to receive the gas separated by the separation device.
In an exemplary embodiment of an aspect of the present invention, the system may further include a combustion tank connected to the gas delivery skid and the separation device through oil pipes, respectively, to receive the gas in the gas delivery skid and the oil separated by the separation device.
In one exemplary embodiment of an aspect of the invention, the system may further comprise a surface emergency shut-off valve disposed on the wellhead outlet pipe, the surface emergency shut-off valve being capable of emergency shut-off upon occurrence of an accident to shut off flowback fluid in the wellhead outlet pipe.
In an exemplary embodiment of an aspect of the invention, the system may further comprise an oil pipe directly connecting the chip trap outlet to the pressure reducing device, so that the return fluid without sand removal after chip trapping by the chip trap can directly enter the pressure reducing device.
In an exemplary embodiment of an aspect of the present invention, n may be 2 to 10.
In one exemplary embodiment of an aspect of the present invention, the pressure reducing device may include n inlets and n outlets, wherein n-1 inlets are capable of receiving and reducing the pressure of the flowback fluid of n-1 wells, respectively; the remaining 1 inlet is capable of receiving and depressurizing the flow back stream passing through the chip trap and desanding device.
In an exemplary embodiment of an aspect of the present invention, the wellhead parallel module may include n inlets and n+1 outlets, wherein the n inlets are respectively connected to outlet lines of n wells, and the wellhead parallel module is capable of switching the flowback fluid of any one of the n wells to flow out in one of the n+1 outlets.
In another aspect, the present invention provides a method for metering and separating oil and gas in unconventional cluster well group, the method is implemented by adopting unconventional cluster well group oil and gas metering and separating system as described above, the method comprises the steps of: determining a wellhead needing to catch scraps and remove sand; cutting the flowback fluid in the outlet pipeline of the wellhead into the chip catcher and the desanding device by utilizing the wellhead parallel module, transferring the chip catcher and the desanding device to the depressurization device after chip catching and desanding, and cutting the flowback fluid of the other wellhead into the depressurization device respectively and independently; measuring the flow rate of the flowback fluid of each well by using a multiphase flowmeter; and separating the flow-back flow of each well by using a separating device.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
(1) The invention solves the technical problems of unreasonable ground flow-back flow layout and large metering error of unconventional gas well cluster well groups such as shale gas and the like;
(2) The method can be used for independently metering and intensively separating unconventional oil gas well cluster well groups such as shale gas and the like, and realizing real-time accurate metering of all well data of the cluster well groups;
(3) The whole process realizes the independent metering and centralized separation of cluster well groups, reduces the equipment quantity, meets the requirement of industrial development of shale gas, and realizes cost reduction and synergy.
Drawings
FIG. 1 illustrates a schematic diagram of a non-conventional cluster well group oil and gas metering and separation system in accordance with one exemplary embodiment of the invention.
The reference numerals are explained as follows:
the device comprises a 1-wellhead parallel module, a 2-chip catcher, a 3-first connecting pipe, a 4-sand removing device, a 5-depressurization device, a 6-second connecting pipe, a 7-multiphase flowmeter, an 8-separation device, a 9-sewage tank, a 10-air delivery sled, a 11-combustion tank and a 12-emergency shut-off valve.
Detailed Description
Hereinafter, the unconventional cluster well group oil and gas metering and separation system and the unconventional cluster well group oil and gas metering and separation method of the present invention will be described in detail with reference to exemplary embodiments and drawings. It should be noted that the terms "first," "second," and the like are merely used for convenience of description and for convenience of distinction and are not to be construed as indicating or implying relative importance.
FIG. 1 illustrates a schematic diagram of a non-conventional cluster well group oil and gas metering and separation system in accordance with one exemplary embodiment of the invention.
In one exemplary embodiment of the invention, the cluster well group comprises n wells, each of which conveys flowback fluid outwardly through a conduit. Here, n is an integer not less than 2. For example, n may be 2-10, i.e., a cluster of wells comprising 2-10 wells deployed on a single platform. Further, n may be 6-8, i.e., the cluster feed includes 6-8 wells deployed on a single platform.
The unconventional cluster well group oil gas metering and separating system can comprise a wellhead parallel module, a first connecting pipe, a chip catcher, a sand removing device, a depressurization device, a second connecting pipe, a multiphase flowmeter and a separating device. The wellhead parallel module is connected with outlet pipelines of the n wells respectively, and can be used for conveying the flowback fluid of any one well of the n wells to the chip catcher and respectively outputting the flowback fluid of the remaining n-1 wells. For example, the wellhead parallel module may include n inlets and n+1 outlets, wherein the n inlets are each connected to an outlet line of n wells, and the wellhead parallel module is capable of switching flowback fluid from any one of the n wells to one of the n+1 outlets for outflow. Specifically, the wellhead parallel module can realize the switching of the n-well flowback fluid to different downstream channels, and can realize the functions of simultaneously opening wells among all wells, avoiding pressure strings among the wells, and carrying out peak shifting, chip capturing and sand removing on the platform wells. Generally, the probability of simultaneous sand removal for two or more wells is not high, so that the system adopts peak-shifting sand removal, and if simultaneous sand removal for two or more wells is required, the corresponding number of sand removal devices needs to be increased. As shown in fig. 1, the cluster well group comprises 4 wells of 5# well, 6# well, 7# well and 8# well which are arranged in parallel at the same well site, and the wellhead parallel module 1 can comprise 4 inlets and 5 outlets, wherein the 4 inlets are respectively connected with outlet pipelines of the 4 wells, and the wellhead parallel module can switch the flow-back fluid of any well of the 4 wells to flow out from one of the 5 outlets. Here, the wellhead parallel module 1 may be a steering manifold. However, the present invention is not limited thereto, and other devices having the same function may be also possible.
One end of the first connecting pipe is connected with the wellhead parallel module, and the other end of the first connecting pipe is connected with the pressure reducing device so as to respectively convey the flowback fluid of the remaining n-1 wells to the pressure reducing device. Specifically, the first connecting pipe 3 comprises n-1 oil pipes, one end of each of the n-1 oil pipes is connected with one of the remaining n-1 outlets of the wellhead parallel device, and the other end is connected with one of n inlets of the depressurization device. The first connecting pipes can respectively convey the flowback fluid in the n-1 wells to the depressurization device for depressurization. As shown in fig. 1, the first connecting pipe comprises 3 oil pipes, one end of each of the 3 oil pipes is connected with one of the remaining 3 outlets of the wellhead parallel device, and the other end is connected with one of the 3 inlets of the depressurization device. The first connecting pipes can respectively convey the flowback fluid in the 3 wells to the depressurization device for depressurization. Wherein, two exports share an oil pipe to save oil pipe.
The chip catcher can receive flowback fluid conveyed by the wellhead parallel module and remove chips in the flowback fluid; the sand removing device is connected with the dust catcher and can remove sand grains and part of solid phase particles in the flowback fluid. Here, the solid phase particles include sludge, fine rock fragments, and the like. Specifically, the pressure reducing device can respectively receive the flowback fluid of the n-1 wells and reduce the pressure of the flowback fluid in the n-1 wells, and the pressure reducing device can also receive the flowback fluid passing through the chip catcher and the sand removing device and reduce the pressure of the flowback fluid. For example, the pressure reducing device may include n inlets and n outlets, wherein n-1 inlets are capable of receiving and reducing the pressure of the flowback fluid of n-1 wells, respectively; the remaining 1 inlet is capable of receiving and depressurizing the flow back stream passing through the chip trap and desanding device. As shown in fig. 1, the pressure reducing device 5 may include 4 inlets and 4 outlets, wherein 3 inlets are capable of receiving and reducing the pressure of the flowback fluid of 3 wells, respectively; the remaining 1 inlet is capable of receiving and depressurizing the flow back stream passing through the chip trap and desanding device. Here, the pressure reducing device may be a choke manifold. However, the present invention is not limited thereto, and other pressure reducing devices having the same function may be used.
One end of the second connecting pipe is connected with the pressure reducing device so as to respectively receive the flowback fluid of the n wells, and the other end of the second connecting pipe can be used for converging the flowback fluid of the n wells and then conveying the flowback fluid to the separating device. The multiphase flow meters are respectively arranged on one ends of the second connecting pipes and can respectively accurately meter the flowback fluid of the n wells. Specifically, the second connecting pipe may include n oil pipes, one ends of the n oil pipes are respectively connected with n outlets of the pressure reducing device, n multiphase flow meters are respectively arranged on the n oil pipes, the flowback fluid of the n wells is separately and accurately metered, the other ends of the n oil pipes are respectively collected into 1 oil pipe, and then are connected with the separating device, so that the flowback fluid of the n wells is conveyed to the separating device for centralized separation. As shown in fig. 1, the second connection pipe 6 may include 4 oil pipes, one ends of the 4 oil pipes are respectively connected with 4 outlets of the pressure reducing device, 4 multiphase flowmeters are respectively arranged on the 4 oil pipes, and separately and accurately measure the flowback fluid of the 4 wells, and the other ends of the 4 oil pipes are respectively gathered into 1 oil pipe and then are connected with the separating device, so that the flowback fluid of the 4 wells is conveyed to the separating device for centralized separation.
The separation device can separate the flow-back fluid entering the separation device to obtain sewage, gas and oil. Specifically, the separation device 8 is capable of intensively separating the flowback fluid of each well of the cluster well group to obtain products such as sewage, gas, oil, and the like, and transferring the products to a corresponding storage device. Here, the separation device may be a separation oil-gas separation device commonly used in the art.
In the present exemplary embodiment, as shown in fig. 1, the system may further include a sump 9, the sump 9 being connected to the separation device 8, the pressure reducing device 5, and the sand removing device 4 through pipes, respectively, to receive sewage generated by the separation device 8, the pressure reducing device 5, and the sand removing device 4.
In the present exemplary embodiment, as shown in fig. 1, the system may further include a gas delivery skid 10, where the gas delivery skid 10 is connected to the separation device 8 through a pipe to receive the gas separated by the separation device 8.
In the present exemplary embodiment, as shown in fig. 1, the system may further include a combustion tank 11, and the combustion tank 11 is connected to the gas delivery skid 10 and the separation device 8 through oil pipes, respectively, to receive the gas in the gas delivery skid 10 and the oil separated by the separation device 8. Through setting up combustion pond 11, can burn oil gas under emergency, avoid oil gas to reveal and produce danger. In the present exemplary embodiment, as shown in fig. 1, the system may further include a surface emergency shut-off valve 12 disposed on the wellhead outlet pipe, the surface emergency shut-off valve 12 being capable of emergency shut-off upon occurrence of an accident to shut off flowback fluid in the wellhead outlet pipe.
In the present exemplary embodiment, as shown in fig. 1, the system may further include an oil pipe directly connecting the outlet of the chip trap 2 with the pressure reducing device 5, so that the return fluid without removing sand after passing through the chip trap 2 can directly enter the pressure reducing device 5.
In another exemplary embodiment of the present invention, an unconventional cluster well group oil and gas metering and separation method for unconventional gas reservoirs with reservoir permeability of 0.001 to 0.1mD, single well production of 5 to 30 trillion per day, significant production variation in the early stages of the drainage operation, developed by cluster well group development, can be achieved by an unconventional cluster well group oil and gas metering and separation system as described above, the method comprising the steps of:
first, a wellhead is determined where debris catching and desanding are required. Specifically, after sand fracturing of unconventional oil and gas wells such as shale gas, in a flowback test, whether the chip is required to be captured or not and whether the chip is required to be captured by one or more wells are judged according to the actual working conditions on site.
And then, cutting the flowback fluid in the outlet pipeline of the well into the chip catcher and the desanding device by using the wellhead parallel module, transferring the chip catcher and the desanding device to the depressurization device after the chip catcher and the desanding, and cutting the flowback fluid of the other wellheads into the depressurization device respectively and independently. Specifically, the flowback fluid of the wellhead needing to catch scraps and remove sand is switched to enter the scraps and remove sand by the wellhead parallel module 1, then enters the depressurization device 5 to be depressurized after being caught scraps and removed by the sand removing device 4, and the flowback fluid of the other wellhead is directly cut into the downstream depressurization device 5 to be depressurized by the first connecting pipe 3.
Next, the flow rate of the flowback fluid of each well is measured separately using a multiphase flow meter. The flow rate of the flowback fluid corresponding to each well is measured by a multiphase flowmeter 7 arranged on the second connecting pipe 6.
Next, the flowback flow from each well is separated using a separation device. The flow-back fluid of each well is separated by a separation device 8 to obtain oil, gas and sewage, and the oil, the gas and the sewage are respectively conveyed to a combustion tank 11, a gas conveying skid 10 and a sewage tank 9.
The method for metering and separating the unconventional oil gas of the cluster well group changes the traditional metering method for metering the unconventional oil gas such as shale gas and the like, and can realize the switching of the well shaft flowback fluid to different downstream channels through the wellhead parallel module aiming at the unconventional cluster well group such as shale gas and the like, thereby realizing the simultaneous well opening among all wells, no cross pressure among the wells and peak-shifting, dust catching and sand removing of the platform well. And when the well bore flowback fluid is subjected to dust catching and sand removal, the pressure is reduced by using a pressure reducing device. In order to achieve accurate metering, according to conventional methods, a well must correspond to a separator. The flow-back fluid after depressurization does not need to enter a separation device for separation and then is metered, but directly enters a multiphase flowmeter to realize independent and accurate metering of liquid and gas of each well, and then the metered fluid is subjected to centralized separation. Because the production of unconventional gas such as shale gas is small, the same platform cluster well group is enough to use one separation device, so that the number of the separation devices is reduced, the cost reduction and synergy of shale gas exploitation are realized, and the exploitation investment return period of shale gas is shortened.
In summary, the beneficial effects of the present invention may include at least one of the following:
(1) The invention solves the technical problems of unreasonable ground flow-back flow layout and large metering error of unconventional gas well cluster well groups such as shale gas and the like;
(2) The method can be used for independently metering and intensively separating unconventional oil gas well cluster well groups such as shale gas and the like, and realizing real-time accurate metering of all well data of the cluster well groups;
(3) The whole process realizes the independent metering and centralized separation of cluster well groups, reduces the equipment quantity, meets the requirement of industrial development of shale gas, and realizes cost reduction and synergy.
Although the present invention has been described above with reference to the exemplary embodiments and the accompanying drawings, it should be apparent to those of ordinary skill in the art that various modifications can be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. An unconventional cluster well group oil-gas metering and separating system, wherein the cluster well group comprises n wells, each of the n wells is used for conveying flowback fluid outwards through a pipeline, the system is characterized by comprising a wellhead parallel module, a first connecting pipe, a chip catcher, a sand removing device, a depressurization device, a second connecting pipe, a multiphase flowmeter and a separating device,
the wellhead parallel module is respectively connected with outlet pipelines of the n wells, and can be used for conveying the flowback fluid of any one of the n wells to the chip catcher and respectively outputting the flowback fluid of the remaining n-1 wells;
one end of the first connecting pipe is connected with the wellhead parallel module, and the other end of the first connecting pipe is connected with the pressure reducing device so as to respectively convey the flowback fluid of the remaining n-1 wells to the pressure reducing device;
the chip catcher can receive flowback fluid conveyed by the wellhead parallel module and remove chips in the flowback fluid;
the sand removing device is connected with the dust catcher and can remove sand grains and part of solid phase particles in the flowback fluid;
the pressure reducing device can respectively receive the flowback fluid of the n-1 wells and reduce the pressure of the flowback fluid in the n-1 wells, and can also receive the flowback fluid passing through the chip catcher and the sand removing device and reduce the pressure of the flowback fluid;
one end of the second connecting pipe is connected with the pressure reducing device so as to respectively receive the flowback fluid of the n wells, and the other end of the second connecting pipe can be used for converging the flowback fluid of the n wells and then conveying the flowback fluid to the separating device;
the multiphase flow meters are respectively arranged on one end of the second connecting pipe and can respectively accurately meter the flowback fluid of the n wells;
the separation device can separate the flow-back fluid entering the separation device to obtain sewage, gas and oil;
wherein n is an integer of not less than 2.
2. The unconventional cluster well group oil and gas metering and separation system of claim 1 further comprising a lagoon connected to the separation device, the depressurization device, and the desanding device, respectively, by pipes to receive the wastewater produced by the separation device, the depressurization device, and the desanding device.
3. The unconventional cluster well group oil and gas metering and separation system of claim 1 or 2, further comprising a gas delivery skid connected to the separation device by a conduit to receive gas separated by the separation device.
4. The unconventional cluster well group oil and gas metering and separation system of claim 3 further comprising a combustion tank connected to the gas delivery skid and the separation device, respectively, by tubing to receive gas from the gas delivery skid and oil from the separation device.
5. The unconventional cluster well group oil and gas metering and separation system of claim 1 further comprising a surface emergency shut-off valve disposed on the wellhead outlet pipe, the surface emergency shut-off valve capable of emergency shut-off upon occurrence of an accident to shut off flowback fluid in the wellhead outlet pipe.
6. The unconventional cluster well group oil and gas metering and separation system of claim 1 further comprising an oil line directly connecting the chip trap outlet to the depressurization device such that desanding-free flowback fluid after chip trapping by the chip trap can directly enter the depressurization device.
7. The unconventional cluster well group oil and gas metering and separation system of claim 1, wherein n is 2 to 10.
8. The unconventional cluster well group oil and gas metering and separation system of claim 1, wherein the depressurization device comprises n inlets and n outlets, wherein,
n-1 inlets can respectively receive the flowback fluid of n-1 wells and perform depressurization treatment on the flowback fluid; the remaining 1 inlet is capable of receiving and depressurizing the flow back stream passing through the chip trap and desanding device.
9. The unconventional cluster well group oil and gas metering and separation system of claim 1, wherein the wellhead parallel module includes n inlets and n +1 outlets, wherein,
the n inlets are respectively connected with outlet pipelines of n wells, and the wellhead parallel module can switch the flow-back fluid of any one of the n wells to one of n+1 outlets for outflow.
10. An unconventional cluster well group oil and gas metering and separation system, the method being implemented by the unconventional cluster well group oil and gas metering and separation system according to any one of claims 1 to 9, the method comprising the steps of:
determining a wellhead needing to catch scraps and remove sand;
cutting the flowback fluid in the outlet pipeline of the wellhead into the chip catcher and the desanding device by utilizing the wellhead parallel module, transferring the chip catcher and the desanding device to the depressurization device after chip catching and desanding, and cutting the flowback fluid of the other wellhead into the depressurization device respectively and independently;
measuring the flow rate of the flowback fluid of each well by using a multiphase flowmeter;
and separating the flow-back flow of each well by using a separating device.
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2020
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