CN114856495A - Underground device for testing gas-water output profile of coal bed gas combined production well - Google Patents
Underground device for testing gas-water output profile of coal bed gas combined production well Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 134
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 239000003245 coal Substances 0.000 title abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000012856 packing Methods 0.000 claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 20
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- 238000007599 discharging Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 13
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- 230000015572 biosynthetic process Effects 0.000 description 2
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- 238000005553 drilling Methods 0.000 description 2
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- 238000005755 formation reaction Methods 0.000 description 2
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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
- E21B43/006—Production of coal-bed methane
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Abstract
The application discloses coal bed gas closes and adopts well gas water production profile test downhole device, the device include center tube, oil pipe, liquid backward flow subassembly, a plurality of electronic switch valve and packing spare. The seals are used to isolate gas and liquid between the two producing zones. After the electronic switch valve is opened, water produced by a production layer enters the oil pipe through the electronic switch valve and flows downwards, and is discharged to the ground along the central pipe through power provided by the liquid backflow component; gas produced by the production zone enters the oil pipe through the electronic switch valve to move upwards and then is discharged out of the ground, so that gas-liquid separation is realized, and the measurement precision is improved. In the test process, continuous measurement of different production layers can be realized without carrying out minor repair operation to move the tubular column, so that the reservoir damage and the tubular column damage caused by normal production and operation are avoided, the test time is shortened, and the test efficiency is improved.
Description
Technical Field
The application relates to the technical field of coal bed gas exploitation, in particular to a coal bed gas co-production well gas water output profile testing underground device.
Background
At present, coal bed gas in China enters a large-scale development stage, and multi-coal-bed joint mining becomes one of main development modes.
With the continuous progress of the drainage and production technology, the requirement on the fineness of drainage and production control is also continuously improved, so that a stratified gas-water production profile test needs to be carried out on a production well to know the gas-water production capacity and the water production rule of different production zones, and scientific and efficient drainage and production control strategies are guided to be formulated.
When the coal bed gas well gas water output profile testing device provided by the related technology is used for testing, the following problems exist:
(1) when the multi-layer combined production is tested, gas and water between different production layers cannot be isolated, so that the gas and the water of different production layers are mixed together, and the gas production and the water production of each production layer cannot be accurately tested. And no matter in single-layer drainage mining or multi-layer combined mining, the produced gas and the produced water cannot be separated, so that the reliability of data obtained by testing is low.
(2) During testing, each time a zone is tested, the device is lifted by a minor repair to place it in the next zone location. The normal production of the coal bed gas well can be interrupted by minor repair operation each time, namely, the gas water output profile at a certain time point in the drainage and mining process can only be tested, and the continuous test of the gas water output profile at a certain stage of the drainage and mining process or the whole drainage and mining life cycle cannot be realized. In addition, the small repair operation not only increases the workload, but also easily damages the device and the production layer in the small repair operation process, and influences the subsequent exploitation of the test well.
Disclosure of Invention
To above-mentioned problem, this application provides a coal bed gas closes production well gas water output profile test downhole device to realize the aqueous vapor separation, improve the measuring precision.
The embodiment of the application adopts the following technical scheme:
a coal bed gas closes and adopts well gas water output profile test downhole device, the device includes:
the system comprises a central pipe, an oil pipe, a plurality of electronic switch valves, a packing part and a flow production assembly;
the central pipe is arranged in the oil pipe and is coaxial with the oil pipe, and the outer diameter of the central pipe is smaller than the inner diameter of the oil pipe so as to form a first annular space between the outer wall of the central pipe and the inner wall of the oil pipe;
a second annular space is formed among the inner wall of the sleeve, the outer wall of the oil pipe and the end face of the sealing element of the packing;
each electronic switch valve is connected between two sections of the oil pipe and used for controlling the communication between the first annular space and the second annular space;
the packing part is connected between two sections of the oil pipe and positioned between two electronic switch valves corresponding to two adjacent production layers, an internal channel of the packing part is communicated with the oil pipe, and the outer wall of the packing part is in contact with the inner wall of the casing pipe and is used for isolating gas and liquid between the two production layers;
the flow production assembly is arranged at one end of the central pipe, which is far away from the wellhead, and is used for discharging water flowing into the first annular space to the ground through the central pipe.
Preferably, the flow production assembly comprises a power part and a flow guide part;
the open end of the flow guide is connected to one end of the oil pipe far away from the wellhead;
the power part is arranged in the flow guide part and connected to one end, far away from the wellhead, of the central pipe.
Preferably, the flow assembly further comprises a connector for connecting the open end of the flow guide to an end of the tubing remote from the wellhead.
Preferably, the connecting piece is an externally hung short section.
Preferably, the packer is a packer.
Preferably, the power member is an electric submersible pump.
Preferably, the difference in the diameter of the oil pipe and the base pipe is at least greater than 25 mm.
Preferably, each of said electronic on-off valves is disposed below the corresponding bottom zone of the producing formation.
Preferably, the distance between the enclosure and the electronic on-off valve located above it is at least 10 m.
Preferably, the distance between the flow guide and the bottom of the well is at least 10 m.
The beneficial effects of the embodiment of the application at least lie in:
the application provides a coalbed methane closes production well gas water output profile test downhole device includes center tube, oil pipe, liquid backward flow subassembly, a plurality of electronic switch valve and packing spare. The seals are used to isolate gas and liquid between two adjacent zones. After the electronic switch valve is opened, water produced by a target production zone enters the first annular space and flows downwards, and then is discharged to the ground along the central pipe under the power provided by the flow collection assembly; the coal bed gas of target reservoir output gets into in the first annular space and upflow, and then discharges to ground to realized separately gathering of water and coal bed gas, improved measurement accuracy. In the test process, continuous measurement of different production layers can be realized without carrying out minor repair operation to move the tubular column, so that reservoir damage and tubular column damage caused by influence on normal production and operation are avoided, the test time is shortened, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a downhole device for testing a gas-water production cross-section of a coalbed methane commingled production well according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the operation of an electronic switch in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an external short section in the embodiment of the present application;
FIG. 4 is a schematic structural view of a flow guide member in an embodiment of the present application;
FIG. 5 is a schematic diagram of an operating principle of the downhole device for testing a gas-water production profile of a coalbed methane co-production well according to the embodiment of the present application.
Wherein the reference numerals denote:
1-a central tube;
2-oil pipe;
3-an electronic switch valve;
31-a motor;
32-connecting rod;
33-a piston;
4-a seal;
5-flow production assembly;
51-a power member;
52-a flow guide;
53-a connector;
531-external short section;
6-a sleeve;
7-a wellhead assembly;
x-a first annular space;
y-a second annular space;
c1 — first zone;
c2-second zone.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Before the embodiments of the present application are described in further detail, it should be noted that the term "target zone" refers to a zone to be produced. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise. The terms of orientation, such as "upper" and "lower", referred to in the embodiments of the present application are used only for clearly describing the coalbed methane well gas water production profile testing device of the embodiments of the present application, and do not have a meaning of limiting the scope of the present application, based on the orientation shown in fig. 1.
The coal-bed gas well gas-water production profile testing device provided by the related technology cannot separate gas-liquid (water and coal-bed gas) produced by a single production zone or a plurality of production zones, so that the measurement precision is low. And during testing, the device is lifted by a minor repair operation to place it in the next zone location, usually each time a zone is tested.
In the field, minor repair operation is also called maintenance operation and is a basic measure for maintaining normal production of an oil well. The basic method of minor repair operation is to take the oil pipe as a means, take out the original tool in the well through the oil pipe, then carry out project construction according to the construction design, and after the construction purpose is completed, put the updated tool or oil pump into the preset position in the well through the oil pipe, and resume production. It can be seen that the minor repair operation flow is complex, and once a production zone is measured, minor repair operation needs to be performed, so that the workload is increased, the operation period is prolonged, and the device and the production zone are easily damaged in the minor repair operation process, so that the subsequent exploitation of the test well is influenced.
In order to solve the problems, the embodiment of the application provides a downhole device for testing the gas-water production profile of a coalbed methane combined production well, as shown in fig. 1, the device comprises a central pipe 1, an oil pipe 2, a plurality of electronic switch valves 3, a sealing part 4 and a production assembly 5, wherein it is to be noted that the sealing part, the electronic switch valves and the production assembly in fig. 1 are schematic and do not represent the specific structures of the sealing part, the electronic switch valves and the production assembly.
The central tube 1 is arranged inside the oil tube 2 coaxially to the oil tube 2, the outer diameter of the central tube 1 being smaller than the inner diameter of the oil tube 2, so that a first annular space X is formed between the central tube 1 and the oil tube 2.
A second annular space Y is formed between the inner wall of the casing 6, the outer wall of the oil pipe 2 and the end face of the seal of the packing 4.
Each electronic on-off valve 3 is connected between two sections of the oil pipe 2 for controlling the communication of the first annular space X with the second annular space Y.
The packing part 4 is connected between two sections of the oil pipe 2 and is positioned between two electronic switch valves 3 corresponding to two adjacent production layers, an internal channel of the packing part is communicated with the oil pipe 2, and the side surface of the packing part is contacted with the inner wall of the sleeve 6 and is used for isolating gas and liquid between the two production layers.
Related technologies provide a coal bed gas well gas water production profile testing device which cannot physically isolate two adjacent production layers, so that during testing, gas water of the adjacent production layers can affect each other, and the measurement results of the produced water and the produced gas of each production layer are not accurate enough. And the packer 4 of the present application can isolate the gas and liquid of adjacent producing zones, so that the test result can be more accurate.
A flow recovery module 5 is arranged at a first end of the base pipe 1 remote from the wellhead for discharging water flowing into the first annular space X through the base pipe 1 to the surface.
It should be noted that the depth of the artificial well bore is far greater than the length of the single oil pipe, so that a plurality of single oil pipes need to be connected in series in the actual exploitation operation process to meet the use requirement. Therefore, the oil pipe 2 mentioned in the embodiment of the present application is substantially a combination body formed by connecting a plurality of single oil pipes in series. The above-mentioned "between two sections of the oil pipe 2" means between two single oil pipes.
Therefore, it should be understood that a plurality of the electronic switching valves 3 and the packing 4 can be connected in series to the oil pipe 2 through the threaded joints provided at both ends of the single oil pipe.
It is also noted that in the art, cementing is an important operational stage in the drilling process. The well cementation is a construction operation of putting a casing into the well and injecting cement into an annular space between the well and the casing, and complex strata which are easy to collapse, leak and the like can be sealed through the well cementation, so that the smooth operation of well drilling is ensured.
The casing is a conventional arrangement for cementing operations and is used herein only for clarity of the location of the components of the apparatus provided in the embodiments of the present application and is not intended to be a substantial limitation on the present solution.
The oil pipe 2 and the end of the central pipe 1 close to the wellhead are communicated with the discharge and production pipeline on the ground through a wellhead device 7, so that produced gas in the first annular space X and produced water in the central pipe 1 can be collected respectively. In the drainage and production process, as the water amount in the first annular space X is gradually reduced, the internal pressure of the first annular space X is smaller than the internal pressure of the second annular space Y, so that the produced water and the produced gas in the second annular space Y can continuously enter the first annular space X through the opened electronic switch valve 3.
The wellhead device 7 is the main equipment used for controlling and regulating oil and gas production at the uppermost part of an oil and gas well, and comprises three parts, namely a casing head, a tubing head and an oil (gas) production tree, and the wellhead device has the main functions of: the method includes suspending a downhole tubing string, a casing string, and sealing an annulus between the tubing string and two layers of casing to control production of the oil and gas well.
After the electronic switch valve is opened, water produced by a target production zone enters the first annular space X and flows downwards, and then is discharged to the ground along the central pipe 1 under the power provided by the flow collection assembly 5; the coal bed gas of target reservoir output gets into in the first annular space X and upflow, and then discharges to ground to realized separately gathering of water and coal bed gas, improved measurement accuracy. In the test process, continuous measurement of different production layers can be realized without carrying out minor repair operation to move the tubular column, so that reservoir damage and tubular column damage caused by influence on normal production and operation are avoided, the test time is shortened, and the test efficiency is improved.
The downhole device for testing the gas-water production profile of the coalbed methane co-production well provided by the embodiment of the application is further explained below.
When multiple gas reservoir production layers exist in the same gas well, the number of the sealing parts and the number of the electronic switch valves need to be determined according to the production layer number of the gas well when multilayer exploitation is carried out by using the embodiment of the application. Since the barriers 4 are used to block the water vapor communication between two adjacent zones, the number of barriers 4 should be one less than the total number of commingled production zones. The electronic switch valves 3 are used for controlling the communication state between the first annular space X and the second annular space Y, so that the water vapor produced by the producing zone in the second annular space Y can enter the first annular space X, and therefore the number of the electronic switch valves 3 is the same as the total number of the commingled producing zones. As shown in fig. 1, in the present embodiment, the gas well includes two production zones of C1 and C2, and therefore, the number of the electronic switching valves 3 is two and the number of the packings 4 is one.
As shown in fig. 1, in the embodiment of the present application, the flow collection assembly 5 may include a power member 51 and a flow guide member 52.
Wherein, the open end of the flow guide 52 is connected to the end of the oil pipe 2 far away from the wellhead; the power element 51 is arranged inside the flow guide 52 and is connected to the end of the base pipe 1 remote from the wellhead.
It will be appreciated that the motive element 51 has a fluid pump outlet connected to the end of the base pipe remote from the wellhead and a fluid suction inlet for sucking water in the deflector 52.
After the first annular space X and the second annular space Y are communicated, produced water of a target production zone enters the first annular space X from the second annular space Y and flows downwards, and the flow guide piece 52 arranged at one end, far away from a wellhead, of the oil pipe 2 can contain downflow water to prevent the downflow water from flowing downwards, so that the effects of temporarily storing water and guiding the water into the power piece 51 are achieved. The power member 51 inside the deflector 52 provides the water inside it with power to lift upwards, so that it is conveyed along the central tube 1 to the ground.
In some embodiments of the present application, as shown in fig. 3, the diversion element 52 may be in the shape of a bottle, and the mouth of the bottle is provided with an internal thread to be connected with an external thread on the end of the central tube 1 away from the wellhead.
It should be understood that the mouth of the flow guide 52 is sized to receive the power member 51 therein during installation, and the body of the flow guide 52 is sized to fully receive the power member 51. The volume of the flow guide member 52 is large enough, or the liquid inflow amount of the flow guide member 52 is smaller than the liquid outflow amount in unit time, so that the flow guide member 52 is ensured to have enough space to contain the liquid, and the liquid overflow is avoided.
Of course, the shape of the diversion member 52 is not limited to the bottle shape as long as the same function can be achieved, and the embodiment of the present application does not limit this.
It will also be appreciated that the end of the base pipe 1 remote from the wellhead extends beyond the corresponding end of the tubing 2 by a distance such that there is clearance between the power element 51 and the end of the tubing 2 remote from the wellhead so that the produced water in the first annular space X can flow into the deflector 52. Otherwise, if the end of the base pipe 1 remote from the wellhead is flush with the corresponding end of the tubing 2, the flow guide 52 connected to the end of the base pipe 1 may block the outlet of the first annular space X, thereby affecting the flow of produced water into the flow guide 52.
To increase the flexibility of the connection between the flow guide 52 and the central pipe 1, in some embodiments of the present application, the flow production assembly 5 further comprises a connector 53 for connecting the open end of the flow guide 52 to the end of the tubing 2 remote from the wellhead.
Further, the connecting member 53 may be an external short section, as shown in fig. 4, the external short section is cylindrical as a whole, an internal thread is provided on the upper end of the inner wall of the cylinder body to be connected with the external thread at the interface of the central tube 1 in a matching manner, and an external thread is provided on the outer wall of the cylinder body to be connected with the internal thread at the interface of the diversion member 52 in a matching manner.
In the embodiment of the present application, the packer 4 may be a packer. Packers are common downhole tools used in the art to seal off producing formations. According to the working principle of the sealing element, the packer is generally divided into four types, namely a self-sealing type packer, a compression type packer, an expansion type packer and a wedge type packer, and is divided into a plurality of types according to the difference of a supporting mode, a setting mode and an unsealing mode. In the embodiment of the application, Y211 series packers can be selected.
The working principle of the Y211 series packer is explained as follows:
the Y211 packer is mainly composed of three structures: the first is a sealing structure used for sealing the communication between the oil pipe and the sleeve; the anchoring structure is used for fixing the packer body on the casing by using the slips and providing a supporting force point for compressing the sealing element; thirdly, right the body structure for guarantee that the packer body normally goes into the sleeve pipe, right the frictional force between piece and the sleeve pipe simultaneously and provide power for the unblock of packer.
When the packer is used, the packer is connected between two sections of the oil pipe and is lowered to a preset position along with the oil pipe. Setting by: and lifting the pipe column to move the middle pipe upwards, enabling the rail pin to enter the reversing mechanism from the short rail, lowering the pipe column, and enabling the rail pin to enter the long rail from the reversing mechanism to realize rail conversion. Then slowly lowering the pipe column, and enabling the top sleeve on the centralizing body to enter the anchoring body part; opening a cover ring of the lock ball to unlock the lock ball; continuing to lower the pipe column, and moving the slips downwards to be spread by the cone and clamped on the sleeve to realize anchoring; and continuously lowering the pipe column, compressing the sealing element by taking the slips as supporting force points, and expanding the sealing element so as to realize physical isolation between two adjacent production layers. Deblocking is carried out by the following steps: and lifting the pipe column, and driving the sealing body and the cone to move upwards by the middle pipe. The sealing element and the slips are withdrawn; meanwhile, the components such as the lock ball, the cover ring, the top sleeve and the like are restored to the original positions, and the unsealing is realized. For the device, the packer is always in a 1-set state during the use process.
Of course, other types of packers capable of achieving the same function may be selected according to actual conditions, and the packer is not limited in this embodiment of the present application.
The power member 51 may be an electric submersible pump. In the field, the electric submersible pump is divided into an electric submersible screw pump, an electric submersible centrifugal pump and the like. In some embodiments of the present application, the power assembly 51 may be an electric submersible screw pump, which is an oil production device combining the advantages of an electric submersible pump and a screw pump, and it changes the ground driving of the screw pump into a direct driving by a motor through a reducer, removing a sucker rod, thereby solving the problems of tripping, rod breakage, wear-out, etc. caused by the threads of the sucker rod and coupling.
Generally, an electric submersible screw pump comprises three parts, namely a downhole part, a surface part and an electric transmission part. The underground part mainly comprises: screw pump, flexible shaft, speed reducer, protector and submersible motor. The ground part mainly comprises: a control cabinet and the like. The power transfer portion has a cable and a cable catch. The working principle is as follows: the electric power is transmitted to the submersible motor by the cable, the submersible motor drives the screw pump to rotate at a low speed through the speed reducer, and the liquid in the flow guide piece is pumped into the central pipe after being pressurized by the screw pump and is lifted to the ground.
It will be understood here that the suction inlet of the screw pump is connected to the end of the central tube 1 remote from the wellhead.
The central pipe 1 may be made of a metal pipe commonly used in the art, and the material of the metal pipe may be the same as that of the oil pipe 2, and the inner diameter of the central pipe 1 at least should ensure that the liquid pumped by the flow production assembly 5 can be smoothly lifted to the ground.
The first annular space X formed between the outer wall of the central pipe 1 and the inner wall of the oil pipe 2 is a channel for conveying produced water and produced gas of a target production zone, so that the space of the first annular space X cannot be too small, otherwise, the first annular space X is not beneficial to gas-liquid collection. Based on this, in the embodiment of the present application, the difference between the inner diameter of the oil pipe 2 and the outer diameter of the base pipe 1 is at least 25 mm. The setting is not limited to the oil pipe 2 and the central pipe 1 of a certain size, namely, no matter what size of the oil pipe 2 and the central pipe 1 is selected, only the difference value between the inner diameter of the oil pipe 2 and the outer diameter of the central pipe 1 is at least 25mm, and the universality is strong. Multiple times of practice proves that the produced water and the produced gas of the target production zone can smoothly flow upwards and downwards respectively based on the size relation between the oil pipe 2 and the central pipe 1, and the collecting effect is good.
The electronic switch valve 3 may refer to a downhole intelligent switch device disclosed in the 201821438458.5 patent application or a downhole stratified fluid sampler disclosed in the 201220558350.6 patent application. The specific structure of the electronic switch valve 3 in the embodiment of the present application is not described again, and the following description is made with reference to fig. 2 for the working principle of the electronic switch valve 3:
before explanation, the meaning represented by each symbol in fig. 2 is explained, wherein black arrows represent a mixture of water and coal bed gas produced by a target production zone; the arrow pointing upwards represents coal bed gas; the arrow pointing downwards represents water.
When gas and liquid are collected, the motor 31 drives the connecting rod 32 to move upwards, and simultaneously drives the piston connected with the connecting rod 32 to move upwards, and the liquid inlet at the side part of the electronic switch valve is opened, so that a mixture of water and coal bed gas produced by a target production zone enters the first annular space X from the second annular space Y, the coal bed gas with low density flows upwards and directly reaches the ground, and the flow is measured by using a gas flowmeter on the ground; the water with high density flows downwards, flows into the flow guide element 52 firstly, then is pumped into the central pipe 1 by the power provided by the power element 51, is discharged to the ground along the central pipe 1, and the flow is measured by a liquid flow meter on the ground, so that the separate collection and measurement of the produced water of the target production zone are realized.
When the electronic switch valve 3 is in the open state, the produced water and the produced gas in the second annular space Y can enter the first annular space X, and therefore the setting position of the electronic switch valve 3 determines the height of the liquid column in the second annular space Y. If the liquid column height is too high, the liquid level can submerge the target producing zone, thereby hindering the production of coal bed methane. Based on this, in this embodiment of the application, each electronic switch valve 3 is disposed below the bottom boundary of the corresponding producing zone, so as to ensure that the liquid injection in the first annular space X is not too high, and the coal bed gas can be smoothly produced outwards.
Meanwhile, the volume of the flowing space of the produced water and the produced gas, namely the second annular space Y, of the target production layer is smaller if the sealing part 4 is closer to the target production layer, so that the collection of the water and the gas is not facilitated. And during production the well is prone to sand production, which will also settle in this space, occupying a portion of the volume of the second annular space Y. When severe sand production is encountered, the sand may occupy a substantial portion of the volume of the second annular space Y and may even clog the target producing zone, impeding the production of coal bed methane. Therefore, in order to avoid the above problem, the embodiment of the present application sets the distance between the packing member 4 and the electronic on-off valve 3 located thereabove to be at least 10 m. Here the top boundary of the zone is the interface of the zone near the wellhead and the bottom boundary is the interface of the zone far from the wellhead.
Here, the electronic on-off valve 3 located above the packing 4 means: and an electronic on-off valve 3 located above and closest to the packing 4.
Similarly, if the flow guide 52 is too close to the bottom of the well, i.e., the space between the flow guide 52 and the bottom of the well is too small, sand may bury the flow guide 52 and affect its normal use, i.e., there should be enough space between the flow guide 52 and the bottom of the well for settling. In this regard, in the embodiment of the present application, the distance between the diversion element 52 and the bottom of the well is at least 10m to ensure that sand does not affect the diversion element 52.
The working principle of the downhole device for testing the gas-water production profile of the coalbed methane co-production well provided by the embodiment of the application is explained with reference to fig. 5 as follows:
the large arrows in fig. 5 represent produced coal bed gas of the target zone and the small arrows represent produced water of the target zone.
As shown in fig. 5, the packer physically isolates zone C1 from zone C2. When the zone C1 is the target zone, the electronic switch valve 3 corresponding to the zone C1 is controlled to be opened, so that the produced water and the produced gas of the zone C1 in the second annular space Y enter the first annular space X. The coal bed gas flows upwards and is discharged to the ground, and the flow rate is measured through an overground gas flowmeter. The water flows downwards to the flow guide element 52 below the oil pipe 2 for temporary storage, and the power element 51 provides power to pump the water in the flow guide element 52 into the central pipe 1 and make the water rise to the ground along the central pipe 1, and the flow is measured by the liquid flow meter above the ground.
Similarly, when the zone C2 is the target zone, the electronic on-off valve 3 corresponding to the zone C2 is opened, so that the produced water and the produced gas of the zone C2 located in the second annular space Y enter the first annular space X. The coal bed gas flows upwards and is discharged to the ground, and the flow rate is measured through an overground gas flowmeter. The water flows downwards to the diversion element 52 below the oil pipe 2 for temporary storage, and the power element 51 provides power to pump the water in the diversion element 52 into the central pipe 1 and make the water rise to the ground along the central pipe 1, and the flow rate is measured by a liquid flow meter on the ground.
Therefore, the coal bed gas co-production well gas water output profile testing underground device provided by the embodiment of the application only needs to be put into the device once in the co-production process of a plurality of production layers, the collection of the steam of the non-production layers can be realized by controlling the opening of the electronic switch valves corresponding to the different production layers, the continuous measurement of the different production layers can be realized without carrying out minor repair operation on a movable pipe column, so that the damage of the reservoir layer and the damage of the pipe column caused by the influence on normal production and operation are avoided, the testing time is shortened, and the testing efficiency is improved. In addition, the produced water and the produced gas of the target production zone are conveyed to the ground through different pipelines for flow detection, so that separate collection of gas and liquid is realized, and the measurement precision is improved.
The application provides a coalbed methane closes production well gas water output profile test downhole device includes center tube, oil pipe, liquid backward flow subassembly, a plurality of electronic switch valve and packing spare. The seals are used to isolate gas and liquid between the two producing zones. After the electronic switch valve is opened, water produced by a production layer enters the oil pipe through the electronic switch valve and flows downwards, and is discharged to the ground along the central pipe through power provided by the liquid backflow component; gas produced by the production zone enters the oil pipe through the electronic switch valve to move upwards and then is discharged out of the ground, so that gas-liquid separation is realized, and the measurement precision is improved. When the device that utilizes this application to provide tests, can completely cut off gas, water between the different reservoir to can accurately test out the gas production and the water yield of each reservoir. And the produced gas and the produced water of a single production zone can be separated, so that the reliability of test data can be ensured. In addition, when utilizing the device that this application provided to test, only need control the opening or closing of the electronic switch valve of corresponding production zone, need not to carry out minor repair operation and remove the tubular column, also can not interrupt the normal production of gas well when utilizing the device to test to can realize the continuous test to the gas water output profile of certain stage or whole row of row's of process of adopting life cycle of row. In addition, reservoir damage and pipe column damage caused by frequent minor repair operation can be avoided, the test time is shortened, and the test efficiency is improved.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A downhole device for testing a gas-water production profile of a coalbed methane combined production well is characterized by comprising a central pipe (1), an oil pipe (2), a plurality of electronic switch valves (3), a packing part (4) and a production assembly (5);
the central pipe (1) is arranged in the oil pipe (2) and is coaxial with the oil pipe (2), and the outer diameter of the central pipe (1) is smaller than the inner diameter of the oil pipe (2) so as to form a first annular space (X) between the outer wall of the central pipe (1) and the inner wall of the oil pipe (2);
a second annular space (Y) is formed between the inner wall of the sleeve (6), the outer wall of the oil pipe (2) and the end face of the sealing element of the packing part (4);
each electronic switch valve (3) is connected between two sections of the oil pipe (2), corresponds to different production layers and is used for controlling the communication between the first annular space (X) and the second annular space (Y);
the sealing part (4) is connected between two sections of the oil pipe (2) and is positioned between two electronic switch valves (3) corresponding to two adjacent production layers, an internal channel of the sealing part is communicated with the oil pipe (2), and the side surface of the sealing part is in contact with the inner wall of the casing pipe (6) and is used for isolating gas and liquid between the two production layers;
the flow production assembly (5) is arranged at one end, far away from the wellhead, of the central pipe (1) and used for discharging water flowing into the first annular space (X) to the ground through the central pipe (1).
2. The downhole device for testing the gas-water production profile of the coalbed methane co-production well according to claim 1,
the flow production assembly (5) comprises a power part (51) and a flow guide part (52);
the open end of the flow guide piece (52) is connected to one end of the oil pipe (2) far away from the wellhead;
the power member (51) is arranged inside the flow guide member (52) and is connected to one end of the central pipe (1) far away from the wellhead.
3. A coalbed methane commingled production well gas water production profile test downhole device according to claim 2, wherein the production assembly (5) further comprises a connector (53) for connecting an open end of the flow guide (52) to an end of the tubing (2) remote from the wellhead.
4. The downhole device for testing the gas-water production profile of the coalbed methane co-production well according to claim 3, wherein the connecting piece (53) is an externally hung pup joint.
5. A coalbed methane co-production well gas-water production profile testing downhole device according to claim 2, characterized in that the packer (4) is a packer.
6. The downhole device for testing the gas-water production profile of a coalbed methane co-production well according to claim 2, wherein the power member (51) is an electric submersible pump.
7. A coalbed methane commingled production well gas water production profile test downhole unit according to claim 6, characterized in that the difference between the inner diameter of the tubing (2) and the outer diameter of the base pipe (1) is at least 25 mm.
8. The downhole device for testing gas-water production profiles of coalbed methane co-production wells according to claim 1, wherein each electronic switch valve (3) is arranged below the bottom boundary of the corresponding production zone.
9. A coalbed methane commingled production well gas water production profile test downhole unit according to claim 8, characterized in that the distance of the packer (4) from the electronic on-off valve (3) located above it is at least 10 m.
10. A coalbed methane co-production well gas-water production profile testing downhole device according to claim 1, wherein the distance between the flow guide (52) and the bottom of the well is at least 10 m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856494A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas-water output profile testing method for coal bed gas combined production well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375465A (en) * | 1993-04-15 | 1994-12-27 | Royal Wireline, Inc. | Method for gas/liquid well profiling |
| CN107227945A (en) * | 2017-08-11 | 2017-10-03 | 付吉平 | Gas well separate zone production, control, the intelligent controlling device of test and control method |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN109653714A (en) * | 2017-10-11 | 2019-04-19 | 中国石油天然气股份有限公司 | Multilayer formation testing tubing string and formation testing method |
| CN111946307A (en) * | 2020-07-29 | 2020-11-17 | 山西晋城无烟煤矿业集团有限责任公司 | Method for layered pressure control combined extraction of coal bed gas of goaf and underlying coal reservoir |
-
2021
- 2021-02-04 CN CN202110155991.0A patent/CN114856495B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375465A (en) * | 1993-04-15 | 1994-12-27 | Royal Wireline, Inc. | Method for gas/liquid well profiling |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN107227945A (en) * | 2017-08-11 | 2017-10-03 | 付吉平 | Gas well separate zone production, control, the intelligent controlling device of test and control method |
| CN109653714A (en) * | 2017-10-11 | 2019-04-19 | 中国石油天然气股份有限公司 | Multilayer formation testing tubing string and formation testing method |
| CN111946307A (en) * | 2020-07-29 | 2020-11-17 | 山西晋城无烟煤矿业集团有限责任公司 | Method for layered pressure control combined extraction of coal bed gas of goaf and underlying coal reservoir |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856494A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas-water output profile testing method for coal bed gas combined production well |
| CN114856494B (en) * | 2021-02-04 | 2024-03-26 | 中国石油天然气股份有限公司 | Method for testing gas and water production profile of coal bed gas combined well |
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| CN114856495B (en) | 2023-12-26 |
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