CN211448630U - Device for extracting natural gas hydrate by depressurization and double-pipe injection of modified fluid - Google Patents
Device for extracting natural gas hydrate by depressurization and double-pipe injection of modified fluid Download PDFInfo
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- CN211448630U CN211448630U CN201920887795.0U CN201920887795U CN211448630U CN 211448630 U CN211448630 U CN 211448630U CN 201920887795 U CN201920887795 U CN 201920887795U CN 211448630 U CN211448630 U CN 211448630U
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Abstract
The utility model discloses a device for extracting natural gas hydrate by depressurization and double-pipe injection of modified fluid, which comprises a gas production detection system, an injection lifting system and a separation system, wherein the injection lifting system comprises an air compression injection device, a water-sand mixing injection device, a production sleeve, a surface sleeve, an outlet of an extraction platform and an electric submersible pump lifting system; the separation system comprises an underground separation system and an aboveground separation system, the underground separation system adopts an expansion hanger to hang a sand control and mud removal sieve tube, and the aboveground separation system comprises a sand control and mud removal device, a water-gas separator and a regulating valve; the gas phase monitoring system is arranged between the electric submersible pump lifting system and the sand control and mud removal device. The utility model discloses combined the advantage of step-down method and injection method, when mining natural gas hydrate resource, can in time master and feedback reservoir change information, according to actual need to the reservoir injection modified fluid carry out manual work, reduce the decomposition exploitation purpose of hydrate.
Description
Technical Field
The utility model belongs to the technical field of natural gas hydrate's exploitation technique and specifically relates to a device that steps down and double-barrelled modified fluid technique exploitation natural gas hydrate that pours into.
Background
Natural gas hydrate (combustible ice) is known as a novel clean alternative energy source in 21 st century, is a white ice and snow-like crystalline compound formed by natural gas (main component methane) and water under the conditions of low temperature and high pressure, and has the characteristics of large reserve, wide distribution, shallow burial, high energy density and clean combustion. The exploitation of the natural gas hydrate is different from the conventional fossil energy, and the basic idea of the exploitation is as follows: the natural gas is produced after the solid hydrate is decomposed into gas and water in situ in the reservoir by changing the temperature-pressure environment in which the natural gas hydrate stably exists, namely the hydrate phase equilibrium condition. According to the conventional natural gas hydrate exploitation methods (a thermal shock method, a decompression method and a chemical reagent method), the conventional natural gas hydrate exploitation methods all relate to the decomposition exploitation of hydrates under the condition of an in-situ deposit reservoir and a multiphase fluid flow process, and compared with the exploitation of oil and natural gas, the conventional natural gas hydrate exploitation methods have great exploitation difficulty.
So far, no economic and effective large-scale commercial exploitation of the natural gas hydrate can be realized, but the actual commercial exploitation purpose is difficult to realize by only adopting one exploitation method in the known methods, and the economic, efficient and safe commercial exploitation purpose of the natural gas hydrate reservoir can be achieved only by combining the advantages of different methods and making up for the deficiencies.
Disclosure of Invention
An object of the utility model is to the problem that prior art exists, provide a realization ocean natural gas hydrate commercialization exploitation that can economy, high efficiency, safety, also can be applied to the step-down of the natural gas hydrate exploitation in the land permafrost layer and double-barrelled device of modified fluid exploitation natural gas hydrate that injects into simultaneously.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a device of modified fluid exploitation natural gas hydrate is annotated in decompression and double-barrelled, includes gas phase monitoring system, pours into lifting system and piece-rate system into, wherein: the injection lifting system comprises an air compression injection device, a water-sand mixing injection device, a production casing, a surface casing, an outlet of the mining platform and an electric submersible pump lifting system, wherein the production casing is arranged in the surface casing; the separation system comprises an underground separation system and an aboveground separation system, the underground separation system adopts an expansion hanger to hang a sand control and mud removal sieve tube, the aboveground separation system comprises a sand control and mud removal device, a water-gas separator and a regulating valve D, and an electric submersible pump lifting system is placed in a production sleeve; the gas phase monitoring system is arranged between the electric submersible pump lifting system and the sand control and mud removal device.
The above scheme further comprises:
the air compression injection device comprises an air compressor, an air storage tank, a second injection pipe and a regulating valve C, wherein the air compressor is connected with the second injection pipe through the air storage tank, and the regulating valve C is arranged between the air storage tank and the second injection pipe; the water-sand mixing and injecting device comprises a water storage tank, a sand storage tank, a water-sand mixing tank, an injection pump and a regulating valve B, wherein the water storage tank and the sand storage tank are connected with a control valve A, and the water-sand mixing tank is connected with a first injection pipe through the injection pump and the regulating valve B; the first injection pipe and the second injection pipe extend into the bottom of a production casing of a shaft of the production well; the sand control and mud removal device is connected with the gas storage tank through a gas phase outlet of the water-gas separator, and a liquid phase outlet of the water-gas separator is connected with the water storage tank.
And a gas phase outlet and a liquid phase outlet of the water-gas separator are respectively provided with a flowmeter.
The gas phase outlet of the water-gas separator is provided with a pore plate flowmeter, and the liquid phase outlet is provided with an electromagnetic flowmeter.
Compared with the prior art, the utility model, have following advantage: the utility model is characterized in that the sand control and mud removal sieve tube realizes effective sand control and is unlikely to influence normal production because of sand blockage. When the submarine natural gas hydrate resource is compositely exploited by a depressurization-injection method, the pressure and permeability change conditions in the reservoir can be mastered in time, corresponding improvement treatment is given in situ, and the danger that the reservoir fluid pore channel is blocked and the pressure is increased sharply to influence the safety and stability of the hydrate reservoir structure in the exploitation process is avoided. The utility model can effectively realize the exploitation of the seabed hydrate; the mining cost is low, the implementation is easy, and the economy is high; the mining technology is simple, the technology of related application equipment is mature, and the industrial mining application can be realized relatively quickly; the mining speed and the change of the reservoir permeability can be effectively controlled; meanwhile, the relevant information of the reservoir can be collected, fed back and processed in time.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus for extracting natural gas hydrate by depressurization and double-pipe injection of modified fluid according to the present invention.
The labels in the figure are: 1. an air compressor; 2. a gas storage tank; 3. a sand control and mud removal device; 4. a water-gas separator; 5. an orifice plate flowmeter; 6. an electromagnetic flow meter; 7. a sand setting tank; 8. a water storage tank; 9. a sand storage box; 10. a water-sand mixing box; 11. an injection pump; 12. a surface casing; 13. a first injection pipe; 14. producing a sleeve; 15. a second injection pipe; 16. an electric submersible pump lifting system; 17. an outlet of the mining platform; 18. artificial well bottom; 19. a monitoring system; 20. adjusting a valve A; 21. adjusting a valve B; 22. adjusting a valve C; 23. adjusting a valve D; 24 natural gas hydrate reservoir.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
The device comprises a gas production detection system, an injection lifting system and a separation system.
The injection and lifting system comprises an air compression injection device, a water-sand mixing injection device and an electric submersible pump lifting system 16. The air compression injection device includes an air compressor 1, an air tank 2, a second injection pipe 15, and a regulating valve C22. The air compressor 1 is connected with the air storage tank 2, the air storage tank 2 is connected with the second injection pipe 15, and the adjusting valve C22 is arranged between the air storage tank 2 and the second injection pipe 15. The water-sand mixing and injecting device comprises a water storage tank 8, a sand storage tank 9, a water-sand mixing tank 10, an injection pump 11 and a regulating valve B21, wherein the water storage tank 8 and the sand storage tank 9 are respectively connected with a control valve A20. The water-sand mixing tank 10 is connected to a first injection pipe 13, an injection pump 11 is provided between the mixing tank 10 and the first injection pipe 13, and a regulating valve B21 is provided between the injection pump 11 and the first injection pipe 13. A production casing 14 is placed in the surface casing 12 and a first injection pipe 13 and a second injection pipe 15 extend into the bottom of the production casing 14 of the production well wellbore. An electric submersible pump lifting system 16 is arranged in the production casing 14, and the outlet of the electric submersible pump lifting system 16 is respectively connected with the outlet 17 of the mining platform and the sand control and mud removal device 3.
The separation system comprises an underground separation system and an aboveground separation system, and the underground separation system adopts an expansion hanger to hang a sand control and mud removal sieve tube. The separation system on the well comprises a sand control and mud removal device 3, a water-gas separator 4, a flow meter 5 and a regulating valve D23. The sand control and mud removal device 3 is connected with the water-gas separator 4, a gas-phase outlet of the water-gas separator 4 is connected with the gas storage tank 2, and a liquid-phase outlet of the water-gas separator 4 is connected with the water storage tank 8.
The sand control and mud removal device 3 is connected with a sand setting tank 7.
An electromagnetic flowmeter 6 is arranged at the water phase outlet of the water-gas separator 4, and an orifice plate flowmeter 5 is arranged at the liquid phase outlet.
The aboveground separation system is used for separating three-phase fluid of water, gas and sand after the fluid is lifted to a wellhead and returning the fluid to the storage tank. Specifically, the method comprises the following steps: the three-phase fluid (water, gas and sand) flows into a sand control and desilting device 3 for desanding and desilting treatment; the fluid after sand removal flows into the next-stage water-gas separator 4 to carry out water-gas two-phase separation, and the liquid after gas-liquid separation directly enters the water storage tank 8.
A gas phase monitoring system 19 is arranged between the electric submersible pump lifting system 16 and the sand control and mud removal device 3.
In the whole process of producing the gas by the depressurization production of the natural gas hydrate, firstly, an underground hydrate reservoir is pumped by an outer shaft of a double-pipe column or hot fluid or modified fluid is injected into the underground reservoir by a central shaft, so that the hydrate is decomposed under the condition of pressure reduction or temperature rise, and further, the decomposition of the reservoir hydrate in a larger area is triggered. Gas-liquid fluid generated by decomposing the hydrate is subjected to sand control and mud removal by the sand control and mud removal device 3, and then is transported and produced from the bottom layer to the outlet 17 of the production platform under the dual actions of well bore pumping outside the production well and pressure difference inside the reservoir. In the process, the water-gas separator 4 is opened and closed according to actual needs, when the water-gas separator 4 is opened, the produced fluid after gas-liquid separation directly enters the water storage tank 8 of the water-sand mixing injection device, and the gas part is collected and extracted from the gas storage tank 2 through the double-well sleeve pipe column; and when the water-gas separator 4 is in a closed state, gas-liquid fluid produced by the reservoir is directly produced from the double-well casing pipe column to the outlet 17 of the production platform. The outlet pressure and the outlet flow of the wellhead are adjusted and controlled according to the real-time reservoir data information in the gas production process, so that the purposes of effectively controlling the gas production speed of hydrate exploitation and better exploiting natural gas are achieved.
After a fixed sleeve part and a separation sealing device are arranged on the wall of a mining well, the natural gas hydrate pilot production method comprises the following procedures:
arranging a second injection pipe 15 and a first injection pipe 13 of a double well tube column for injecting and exhausting liquid in a well bore of a production well, and simultaneously configuring a pressure sensor, a flow sensor and an acoustic energy sensor for detecting and monitoring; and checking whether all pipelines, circuit connections and regulating valves of the natural gas hydrate exploitation device are normal or not, and setting initial parameters such as flow rates of three-phase fluids of water, gas and sand, gas-liquid ratios, sand ratios and injection speeds.
And step two, starting the injection lifting system to reduce the pressure of the reservoir, triggering the instability of the natural gas hydrate to decompose the natural gas hydrate into liquid water and gaseous natural gas, simultaneously monitoring the reservoir information in real time by using the pressure and sound energy sensors, starting hydraulic supercharging equipment to improve the permeability of the reservoir according to the requirement of the exploitation process, and ensuring the smoothness of a fluid flow channel and the smoothness of depressurization and gas production. The method specifically comprises the following steps: compressed air in the air storage tank 2 is injected into an artificial well bottom 18 through a second injection pipe 15, water in the water storage tank 8 and sand in the sand storage box 9 enter a water-sand mixing box 10 in proportion to be mixed, and the mixed water is pressurized through an injection pump 11 and then injected into the artificial well bottom 18 through a first injection pipe 13.
Step three: the method comprises the steps of generating more gaseous natural gas and liquid water along with the decomposition of large-area natural gas hydrate, extracting natural gas from a reservoir stratum in a mode of determining outlet flow or outlet pressure at a wellhead of a production well, filtering the gaseous natural gas and the liquid water through a sand filtering device, separating and collecting the gaseous natural gas and the liquid water through a multi-stage gas-liquid separator, refluxing part of generated fluid into a lifting system through a water-gas separator 4, and collecting most of the generated fluid to an onshore gas-water collecting system along with gas in a pumping mode for separation and reuse. The gas production well completion pipe column adopts a sand control and mud removal sieve pipe, adopts graded sand control, and carries out mud removal in a positive and negative circulation well washing mode. The method specifically comprises the following steps: the electric submersible pump lifting system 16 lifts a three-phase mixture of water, gas and sand at the bottom of an artificial well to a well head, the mixture flows into the sand control and desilting device 3 through a pipeline to remove sand, fluid subjected to sand removal and desilting flows into the water-gas separator 4 to be subjected to water-gas two-phase separation, gas phase flow data and water phase flow data are collected, gas returns to the gas storage tank 2, water returns to the water storage tank 8, sand enters the sand setting tank 7, sand production amount is measured, and the lifting efficiency, the gas-liquid separation efficiency and the sand carrying capacity of the electric submersible pump are evaluated.
And finally, repeating the steps by changing the operating parameters of the trial production simulation device, and monitoring and analyzing the change rule of the historical working curve under the influence of different parameters by the monitoring system 19.
Example 2
A device for exploiting natural gas hydrate by a depressurization and double-pipe injection modified fluid technology comprises an exploitation well penetrating through a seawater layer, a natural gas hydrate upper sediment layer and a natural gas hydrate reservoir, wherein the exploitation well is arranged above a natural gas hydrate lower sediment layer; and (3) setting a method for injecting the modified fluid into the natural gas hydrate reservoir section of the tubular column, and injecting the modified fluid. A pressure sensor, a flow sensor and an acoustic energy sensor which are connected to the signal processor through data lines are correspondingly arranged. The method comprises the steps of designing a casing pipe column arranged in a well bore of a production well, carrying out depressurization production on the natural gas hydrate in a reservoir by using an inner shaft of the pipe column, detecting and monitoring the condition of the reservoir by using corresponding sensors arranged at the bottom of the outer pipe column, and starting a modified fluid injection device to carry out manual modified fluid injection operation on the reservoir according to needs. The device is also provided with a sand control and desilting device, a multi-stage gas-liquid separator and a water injection pump, wherein the gas-liquid separators of different stages are respectively connected with the pressure booster and the water injection pump on the offshore platform so as to provide the fluid supply requirement for injecting the modified fluid system; the sensors for monitoring the bottom of the shaft are connected with a signal processor so as to meet the requirements of timely collection and feedback. The offshore platform is provided with a gas comprehensive treatment and utilization end. Reservoir pressure information, injected fluid flow information and injected modified fluid information collected by the acoustic energy sensor are collected by the signal processor and analyzed and processed, so that the hydrate decomposition condition and permeability change in the reservoir can be mastered in time, the extraction speed of decomposing and producing gas by the hydrate and the improvement processing of the reservoir permeability are adjusted and controlled, and the economic, efficient and stable extraction purpose is achieved.
Claims (4)
1. The utility model provides a device of modified fluid exploitation natural gas hydrate is annotated in decompression and double-barrelled, includes gas phase monitoring system (19), pours into lifting system and piece-rate system, its characterized in that: the injection lifting system comprises an air compression injection device, a water-sand mixing injection device, a production casing (14), a surface casing (12), a mining platform outlet (17) and an electric submersible pump lifting system (16), wherein the production casing (14) is arranged in the surface casing (12); the separation system comprises an underground separation system and an aboveground separation system, the underground separation system adopts an expansion hanger to hang a sand control and mud removal sieve tube, and the aboveground separation system comprises a sand control and mud removal device (3), a water-gas separator (4) and a regulating valve D (23); the electric submersible pump lifting system (16) is arranged in the production casing (14), and the outlet of the electric submersible pump lifting system (16) is respectively connected with the outlet (17) of the mining platform and the sand control and mud removal device (3); the gas-phase monitoring system (19) is arranged between the electric submersible pump lifting system (16) and the sand control and mud removal device (3); the sand control and mud removal device (3) is connected with a sand setting tank (7).
2. The apparatus for producing natural gas hydrate by depressurization and double injection of modified fluid according to claim 1, wherein: the air compression injection device comprises an air compressor (1), an air storage tank (2), a second injection pipe (15) and a regulating valve C (22), wherein the air compressor (1) is connected with the second injection pipe (15) through the air storage tank (2), and the regulating valve C (22) is arranged between the air storage tank (2) and the second injection pipe (15); the water-sand mixing and injecting device comprises a water storage tank (8), a sand storage box (9), a water-sand mixing box (10), an injection pump (11) and a regulating valve B (21), wherein the water storage tank (8) and the sand storage box (9) are connected with a control valve A (20), and the water-sand mixing box (10) is connected with a first injection pipe (13) through the injection pump (11) and the regulating valve B (21); the first injection pipe (13) and the second injection pipe (15) extend into the bottom of a production casing (14) of a well shaft of the production well; the sand control and mud removal device (3) is connected with the gas storage tank (2) through a gas phase outlet of the water-gas separator (4), and a liquid phase outlet of the water-gas separator (4) is connected with the water storage tank (8).
3. The apparatus for producing natural gas hydrate by depressurization and double injection of modified fluid according to claim 2, wherein: and a gas phase outlet and a liquid phase outlet of the water-gas separator (4) are respectively provided with a flowmeter.
4. The apparatus for producing natural gas hydrates by depressurization and double injection of a modified fluid according to claim 3, wherein: and a gas phase outlet of the water-gas separator (4) is provided with a pore plate flowmeter (5), and a liquid phase outlet is provided with an electromagnetic flowmeter (6).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343557A (en) * | 2020-12-18 | 2021-02-09 | 福州大学 | Sea area natural gas hydrate self-entry type exploitation device and exploitation method |
| CN113123763A (en) * | 2021-04-13 | 2021-07-16 | 上海万维亿通装备制造有限公司 | Combustible ice mining system and process |
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2019
- 2019-06-13 CN CN201920887795.0U patent/CN211448630U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343557A (en) * | 2020-12-18 | 2021-02-09 | 福州大学 | Sea area natural gas hydrate self-entry type exploitation device and exploitation method |
| CN113123763A (en) * | 2021-04-13 | 2021-07-16 | 上海万维亿通装备制造有限公司 | Combustible ice mining system and process |
| CN113123763B (en) * | 2021-04-13 | 2024-01-26 | 上海万维亿通装备制造有限公司 | Combustible ice exploitation system and process |
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