CN212027661U - Sea area natural gas hydrate gas lift reverse circulation well drilling system - Google Patents
Sea area natural gas hydrate gas lift reverse circulation well drilling system Download PDFInfo
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- CN212027661U CN212027661U CN202020787963.1U CN202020787963U CN212027661U CN 212027661 U CN212027661 U CN 212027661U CN 202020787963 U CN202020787963 U CN 202020787963U CN 212027661 U CN212027661 U CN 212027661U
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Abstract
The utility model discloses a sea area natural gas hydrate gas lift reverse circulation drilling system, drilling system are including rig, drilling platform, initiative drilling rod and drill bit, and wherein the rig frame is established on drilling platform's top surface, and the initiative drilling rod is hung on the rig, and the lower part at the initiative drilling rod is established to the drill bit, is equipped with the three channel drilling rod between drill bit and the initiative drilling rod, and the top of initiative drilling rod is equipped with air water faucet, and air water faucet is connected with natural gas piece-rate system through the pipeline. The method comprises the following steps: step one, forming a vertical channel; secondly, crushing the hydrate reservoir by using a high-pressure water jet auxiliary cutting tool; step three, the natural gas separated by the decompression decomposition tank enters a gas storage tank through a gas transmission pipe to be stored; and step four, forming water jet for cutting the stratum and cooling the drill bit. Has the advantages that: the reverse circulation rock carrying efficiency is high, formation of a detritus bed can be avoided, underground complex conditions are reduced, and non-production time is shortened.
Description
Technical Field
The utility model relates to a gas lift reverse circulation drilling system, in particular to sea area gas hydrate gas lift reverse circulation drilling system.
Background
At present, natural gas hydrate is a compound with a cage structure formed by water molecules and gas molecules such as methane under the conditions of low temperature, high pressure and gas volume fraction larger than that of a solution thereof, is a clean and pollution-free novel energy source, is present in deep sea sediments and permafrost areas in a solid state form, and is estimated to have favorable conditions for forming hydrate in 20.7% of land and 90% of deep sea bottom, wherein the storage capacity of marine hydrate is huge, and the total conservative estimation amount reaches 2.83 multiplied by 1015m3Which is 100 times the amount of land resources.
The exploitation method (depressurization method, heating method and injection inhibitor method) of the diagenetic natural gas hydrate adopts the modes of depressurization, heating, injection and the like to destroy the stable existing temperature and pressure conditions of the hydrate so as to decompose the hydrate into gas and water, and the decomposed gas flows into a shaft through a rock fracture and then is transported to ground gas storage equipment for collection. However, in the process of depressurization production, the migration of particles can cause the permeability change of a reservoir layer, and the compaction action causes the damage of a stratum, thereby influencing the stability and sustainability of gas production.
Non-diagenetic hydrates refer to hydrate particles that are trapped in a weakly cemented, friable, unformed rock skeleton, often represented as a sand-water mixed slurry. The carbon dioxide displacement method can only mine non-diagenetic natural gas hydrate with a contact surface with carbon dioxide, and is not suitable for large-scale commercial exploitation. In large-scale commercial exploitation, geological structures may become evacuated, so that seabed strata are unstable, and geological disasters such as seabed settlement, collapse and seabed landslide occur.
In summary, the technical problems of various mining methods are bottlenecks that restrict commercial exploitation of natural gas hydrates. The utility model provides a sea area natural gas hydrate gas lift reverse circulation well drilling system and exploitation method aims at solving the technological problem that present natural gas hydrate exploitation faced to the development and utilization for hydrate provides new thinking.
Disclosure of Invention
The utility model aims at solving a great deal of problems that seabed natural gas hydrate exists in the exploitation process and providing a sea area natural gas hydrate gas lift reverse circulation drilling system and exploitation method.
The utility model provides a sea area natural gas hydrate gas lift reverse circulation drilling system is including rig, drilling platform, initiative drilling rod and drill bit, and wherein the rig is established on drilling platform's top surface, and the initiative drilling rod is hung on the rig, and the lower part at the initiative drilling rod is established to the drill bit, is equipped with the three channel drilling rod between drill bit and the initiative drilling rod, and the top of initiative drilling rod is equipped with air water faucet, and air water faucet is connected with natural gas piece-rate system through the pipeline.
The lower end of an active drill rod is sleeved with a blowout preventer, the lower part of the blowout preventer is sleeved with a water-stop guide pipe, the lower end of the active drill rod is connected with the upper end of a three-channel drill rod and penetrates through a central channel of the blowout preventer and the water-stop guide pipe, the three-channel drill rod is composed of an outer drill rod, an inner drill rod and an air injection pipe, wherein the inner drill rod is inserted in the outer drill rod, the inner drill rod and the outer drill rod are of a concentric structure, the inner cavity of the inner drill rod is provided with the central channel, an annular channel is formed between the inner wall of the outer drill rod and the outer wall of the inner drill rod, the air injection pipe is inserted in the annular channel and is arranged in parallel with the inner drill rod, the longitudinal connection mode of the inner drill rod is insertion connection, the outer drill rod is in threaded connection longitudinally, the air injection pipe adopts a metal hose, the longitudinal direction of the air, the section structure of the driving drill rod corresponds to that of the three-channel drill rod, and the inner cavity of the driving drill rod is communicated with that of the three-channel drill rod.
The drill bit is internally provided with a jetting and sucking hole and an alloy nozzle, the jetting and sucking hole is communicated with a central channel of the inner layer drill rod, the alloy nozzle is communicated with an annular channel between the inner layer drill rod and the outer layer drill rod, and an inner cavity of the drill bit is communicated with the central channel of the inner layer drill rod.
Natural gas piece-rate system is including step-down decomposition tank and gas holder, be connected through the gas-supply pipe between step-down decomposition tank and the gas holder, the export of the air water tap of initiative drilling rod top assembly is connected through the import of first pipeline with step-down decomposition tank, the row's cinder notch of step-down decomposition tank bottom is connected with air water tap's inlet through the second pipeline, be equipped with solid-liquid separator on the second pipeline in proper order, slush pump and surge tank, the surge tank is heatable formula, the gas holder is connected with air water tap's air inlet through the third pipeline, be equipped with methane storage tank and explosion-proof air compressor machine on the third pipeline.
The utility model provides a sea area natural gas hydrate gas lift reverse circulation exploitation method, its method as follows:
firstly, a riser pipe is lowered to a position close to a hydrate reservoir stratum, a blowout preventer is installed, and a vertical channel is formed;
secondly, a high-pressure water jet is utilized to assist a cutting tool to break a hydrate reservoir stratum to generate slurry consisting of hydrate particles, rock debris and seawater, the jet is ejected out of the bottom of a drill bit through an ejection and suction hole on the drill bit to form a entrainment effect, methane gas in a methane storage tank is injected into a central channel in a three-channel drill rod through an explosion-proof air compressor, an air water faucet, a driving drill rod and a gas injection pipe and is ejected out of a gas-water mixer to form bubbles to quickly rise along the central channel of the inner layer drill rod and simultaneously expand to realize a gas lift effect, and the hydrate particles, the rock debris, the seawater and the methane gas are ensured to return to the ground surface along the central channel of the inner layer drill rod and an inner cavity of the driving drill rod;
step three, the multiphase flow slurry containing the hydrate particles flows out of an outlet of the gas-water tap and enters a pressure reduction decomposition tank, and the natural gas separated from the pressure reduction decomposition tank enters a gas storage tank through a gas transmission pipe for storage;
and step four, purifying the liquid-solid slurry separated by the decompression decomposition tank through a solid-liquid separator on a second pipeline through a slag discharge port at the bottom of the decompression decomposition tank, conveying the separated seawater to a slurry pump, allowing the seawater to enter an inner cavity of the active drill rod through the slurry pump, the heatable pressure stabilizing tank and a gas-water tap liquid inlet, and allowing the seawater to descend to a bottom hole drill bit along an annular channel between an outer drill rod and an inner drill rod in an inner cavity of the three-channel drill rod at the lower part of the active drill rod to form water jet for cutting the stratum and cooling the drill bit.
The blowout preventer, the depressurization decomposition tank, the gas storage tank, the solid-liquid separator, the slurry pump, the surge tank, the methane storage tank and the explosion-proof air compressor are all assembled by existing equipment, and therefore specific models and specifications are not described repeatedly.
The working principle of the utility model is as follows:
the early construction process comprises the following steps: the conventional drilling method is adopted to drill a well in the overburden stratum to a near hydrate reservoir stratum, a water-resisting guide pipe is put in and is filled with cement for reinforcement, then a blowout preventer is installed on the water-resisting guide pipe to reserve a vertical channel for a downhole drilling tool, and the pressure of a shaft and the flow of fluid are accurately controlled.
Drilling and exploiting a hydrate reservoir: and sequentially putting the drill bit and the three-channel drill rod, installing the driving drill rod and the air tap, and driving the three-channel drill rod and the drill bit to rotate by the driving drill rod. Seawater is conveyed to a liquid inlet of the air-water tap through the heated surge tank by a mud pump, and enters the drill bit along the inner channels of the driving drill rod and the three-channel drill rod. A part of seawater is ejected out of an alloy nozzle in the drill bit to form radial high-speed water jet to assist a cutting tool to break a hydrate reservoir stratum and generate slurry consisting of hydrate particles, rock debris and seawater; the other part of seawater forms water jet which is sprayed upwards in an inclined way through the injection hole in the drill bit, and forms a local negative pressure area at the bottom of the drill bit, and slurry containing hydrate particles is guided to enter the inner cavity of the drill bit. On the other hand, methane gas in the methane storage tank is injected into a central channel of an inner layer drill rod in the three-channel drill rod through the explosion-proof air compressor, the air water faucet, the driving drill rod and the gas injection pipe and is sprayed out through the air-water mixer, so that a gas lift effect is realized, hydrate particles, rock debris, seawater and methane gas are ensured to return to the ground surface along the central channel of the inner layer drill rod and the driving drill rod in a gas-liquid-solid multiphase flow mode, and enter the pressure reduction decomposition tank for further decomposition, collection and treatment.
The working principle of reverse circulation transportation is as follows: methane gas is sent into an underground gas-water mixer by an explosion-proof air compressor and then enters a central channel of the inner layer drill rod, and the methane gas is mixed with seawater to form gas-liquid mixed liquid with lower density, so that pressure difference is generated inside and outside the pipe of the inner layer drill rod, and gas-lift reverse circulation is realized; on the other hand, after a part of seawater is jetted out through the jetting and sucking holes of the drill bit, the seawater can be sucked in an entrainment manner to enter the inner cavity of the drill bit and form a local negative pressure area at the bottom of the drill bit, so that the jetting and sucking reverse circulation is realized. Under the combined action of the gas lift reverse circulation and the jetting reverse circulation, the multiphase slurry mixture at the bottom of the hole returns to the surface along the central channel of the drill pipe.
The working principle of natural gas separation is as follows: multiphase flow slurry containing hydrate particles and returning upwards from the driving drill rod enters a hydrate depressurization decomposition tank, the crushed hydrate particles are decomposed along with the rise of temperature and the reduction of pressure and are separated from gas and liquid, and the decomposed natural gas enters a gas storage tank along a gas transmission pipe for storage and provides methane gas for gas lift reverse circulation. The residual liquid-solid slurry flows into a solid-liquid separator for liquid-solid separation, the separated silt is collected in a centralized manner, and the separated and purified seawater is injected into a slurry pump again for repeated utilization.
The utility model provides a sea area gas hydrate gas lift reverse circulation drilling system and exploitation method utilizes the supplementary cutting tool of water jet broken hydrate rock stratum, adopts the gas lift reverse circulation to transport the mode of heterogeneous flow thick liquid and ground separation storage, is expected to solve the reservoir stratum collapse, the kick and the lost circulation scheduling problem that the gas hydrate conventional methods such as step-down, heat injection, replacement caused easily. The seawater and the methane gas are used as circulating media without adding other pollutants, and are recycled, so that the non-diagenetic rock or diagenetic rock natural gas hydrate resources at the seabed can be exploited in an environment-friendly, efficient, safe and economic manner.
The utility model has the advantages that:
the utility model provides a sea area natural gas hydrate gas lift reverse circulation drilling system and exploitation method utilizes the three-channel drilling rod to realize drilling fluid closed circulation, reduces to the hole wall and erodes, can prevent the hole wall collapse because of hydrate decomposition causes; the reverse circulation rock carrying efficiency is high, formation of a detritus bed can be avoided, the complex condition in the well is reduced, and the non-production time is reduced; the pressure of the hydrate return channel is lower than the external pressure of the shaft, so that the decomposition of the natural gas hydrate is facilitated; the circulation channel has strong controllability, so that the pressure and the temperature in the shaft can be conveniently controlled; heated fluid can be injected through an annular channel of the drill rod, and the environmental temperature of the shaft is adjusted to break the phase balance of the hydrate and improve the yield of the hydrate.
Drawings
Fig. 1 is the overall structure schematic diagram of the drilling system of the present invention.
Figure 2 is the utility model discloses a three channel drilling rod section top view.
Fig. 3 is the local enlarged schematic view of the connection relationship between the three-channel drill rod and the drill bit of the present invention.
The labels in the above figures are as follows:
1. a drilling tower 2, a drilling platform 3, a driving drill rod 4, a drill bit 5 and a three-channel drill rod
6. An air water tap 7, a blowout preventer 8, a water-resisting guide pipe 9, an outer layer drill rod 10 and an inner layer drill rod
11. Gas injection pipe 12, central channel 13, annular channel 14, gas-water mixer
15. A jetting and sucking hole 16, an alloy nozzle 17, a decompression decomposing tank 18 and a gas storage tank
19. Gas pipe 20, first pipeline 21, second pipeline 22, solid-liquid separator
23. A mud pump 24, a surge tank 25, a third pipeline 26 and a methane storage tank
27. Explosion-proof air compressor 28, hydrate reservoir 29, sea water 30, overburden.
Detailed Description
Please refer to fig. 1 to 3:
the utility model provides a sea area natural gas hydrate gas lift reverse circulation drilling system is including rig 1, drilling platform 2, initiative drilling rod 3 and drill bit 4, wherein rig 1 erects on drilling platform 2's top surface, initiative drilling rod 3 hangs on rig 1, drill bit 4 is established in the lower part of initiative drilling rod 3, be equipped with three channel drilling rod 5 between drill bit 4 and the initiative drilling rod 3, the top of initiative drilling rod 3 is equipped with air water faucet 6, air water faucet 6 is connected with natural gas piece-rate system through the pipeline.
The lower end of the active drill rod 3 is sleeved with a blowout preventer 7, the lower part of the blowout preventer 7 is sleeved with a water-stop guide pipe 8, the lower end of the active drill rod 3 is connected with the upper end of a three-channel drill rod 5 and penetrates through a central channel of the blowout preventer 7 and the water-stop guide pipe 8, the three-channel drill rod 5 consists of an outer drill rod 9, an inner drill rod 10 and an air injection pipe 11, wherein the inner drill rod 10 is inserted in the outer drill rod 9, the inner drill rod 10 and the outer drill rod 9 are of a concentric structure, the inner cavity of the inner drill rod 10 is provided with a central channel 12, an annular channel 13 is formed between the inner wall of the outer drill rod 9 and the outer wall of the inner drill rod 10, the air injection pipe 11 is inserted in the annular channel 13 and arranged in parallel with the inner drill rod 10, the inner drill rod 10 is in an inserting connection mode, the outer drill, a gas-water mixer 14 is assembled in a central channel 12 of the inner layer drill rod 10, the gas-water mixer 14 is connected with a gas injection pipe 11 through a through hole in the side wall of the inner layer drill rod 10, the active drill rod 3 corresponds to the section structure of the three-channel drill rod 5, and the inner cavity of the active drill rod 3 is communicated with the inner cavity of the three-channel drill rod 5.
The drill bit 4 is internally provided with a jetting and sucking hole 15 and an alloy nozzle 16, the jetting and sucking hole 15 is communicated with a central channel 12 of the inner drill rod 10, the alloy nozzle 16 is communicated with an annular channel 13 between the inner drill rod 10 and the outer drill rod 9, and the inner cavity of the drill bit 4 is communicated with the central channel 12 of the inner drill rod 10.
Natural gas separation system is including step-down decomposition tank 17 and gas holder 18, be connected through gas-supply pipe 19 between step-down decomposition tank 17 and the gas holder 18, the export of the air water tap 6 of 3 top assemblies of initiative drilling rod is connected with the import of step-down decomposition tank 17 through first pipeline 20, the row's cinder notch of step-down decomposition tank 17 bottom is connected with the inlet of air water tap 6 through second pipeline 21, solid-liquid separator 22 has been equipped with in proper order on the second pipeline 21, slush pump 23 and surge tank 24, surge tank 24 is heatable formula, gas holder 18 is connected with air water tap 6's air inlet through third pipeline 25, be equipped with methane storage tank 26 and explosion-proof air compressor 27 on the third pipeline 25.
The utility model provides a sea area natural gas hydrate gas lift reverse circulation exploitation method, its method as follows:
firstly, a riser pipe 8 is lowered to be close to a hydrate reservoir stratum 28, and a blowout preventer 7 is installed to form a vertical channel;
secondly, crushing a hydrate reservoir 28 by using a high-pressure water jet auxiliary cutting tool to generate slurry consisting of hydrate particles, rock debris and seawater 29, ejecting the jet through an ejection and suction hole 15 on a drill bit 4 to form entrainment, injecting methane gas in a methane storage tank 26 into a central channel 12 in a three-channel drill rod 5 through an explosion-proof air compressor 27, an air-water faucet 6, an active drill rod 3 and an air injection pipe 11, ejecting the methane gas through an air-water mixer 14 to form bubbles to quickly rise along the central channel 12 of the inner-layer drill rod 10, and simultaneously expanding to realize air lift effect, so that the hydrate particles, the rock debris, the seawater 29 and the methane gas are ensured to return to the ground surface along the central channel 12 of the inner-layer drill rod 10 and an inner cavity of the active drill rod 3 in a gas-liquid-solid multi-phase flow mode;
step three, the multiphase flow slurry containing the hydrate particles flows out of an outlet of the gas-water faucet 6 and enters the pressure reduction decomposition tank 17, and the natural gas separated by the pressure reduction decomposition tank 17 enters the gas storage tank 18 through the gas transmission pipe 19 for storage;
and step four, purifying the liquid-solid slurry separated by the pressure-reducing decomposition tank 17 through a slag discharge port at the bottom of the pressure-reducing decomposition tank 17 by a solid-liquid separator 22 on a second pipeline 21, then conveying the separated seawater 29 to a slurry pump 23, feeding the seawater 29 into the inner cavity of the active drill rod 3 through the slurry pump 23, a heatable pressure-stabilizing tank 24 and a gas-water tap 6 liquid inlet, and descending to a well bottom drill bit 4 along an annular channel 13 between an outer drill rod 9 and an inner drill rod 10 in the inner cavity of the three-channel drill rod 5 at the lower part of the active drill rod 3 to form water jet for cutting the stratum and cooling the drill bit 4.
The blowout preventer 7, the depressurization decomposition tank 17, the gas storage tank 18, the solid-liquid separator 22, the slurry pump 23, the surge tank 24, the methane storage tank 26 and the explosion-proof air compressor 27 are all assembled by existing equipment, and therefore specific models and specifications are not described in detail.
The working principle of the utility model is as follows:
the early construction process comprises the following steps: the method comprises the steps of conducting primary drilling in an overburden stratum 30 to be close to a hydrate reservoir 28 by adopting a conventional drilling method, descending a riser pipe 8, pouring cement for reinforcement, installing a blowout preventer 7 on the riser pipe 8, reserving a vertical channel for a downhole drilling tool, and accurately controlling the pressure of a shaft and the flow of fluid.
Drilling and exploiting a hydrate reservoir: and sequentially putting a drill bit 4 and a three-channel drill rod 5, installing a driving drill rod 3 and an air tap 6, and driving the three-channel drill rod 5 and the drill bit 4 to rotate by the driving drill rod 3. Seawater 29 is delivered to the liquid inlet of the air-water tap 6 through the heated surge tank 24 by the mud pump 23, and the seawater 29 enters the drill bit 4 along the inner channels of the active drill pipe 3 and the three-channel drill pipe 5. A part of seawater 29 is ejected through an alloy nozzle 16 in the drill bit 4 to form a radial high-speed water jet to assist a cutting tool in breaking up a hydrate reservoir 28 and generate slurry consisting of hydrate particles, rock debris and seawater 29; another part of the sea water 29 forms a water jet which is sprayed obliquely upwards through the jetting and sucking holes 15 in the drill bit 4 and forms a local negative pressure area at the bottom of the drill bit 4, and the slurry containing the hydrate particles is guided into the inner cavity of the drill bit 4. On the other hand, methane gas in the methane storage tank 26 is injected into the central channel 12 of the inner drill rod 10 in the three-channel drill rod 5 through the explosion-proof air compressor 27, the air-water tap 6, the active drill rod 3 and the gas injection pipe 11, and is sprayed out through the air-water mixer 14, so that the gas lift effect is realized, and hydrate particles, rock debris, seawater 29 and methane gas are ensured to return to the ground surface along the central channel 12 of the inner drill rod 10 and the active drill rod 3 in a gas-liquid-solid multiphase flow mode, and enter the depressurization decomposition tank 17 for further decomposition, collection and treatment.
The working principle of reverse circulation transportation is as follows: methane gas is sent into an underground gas-water mixer 14 by an explosion-proof air compressor 27 and then enters a central channel 12 of the inner layer drill rod 10, and the methane gas is mixed with seawater 29 to form gas-liquid mixed liquid with lower density, so that pressure difference is generated inside and outside the pipe of the inner layer drill rod 10, and gas lift reverse circulation is realized; on the other hand, after a part of seawater 29 is jetted out through the jetting and sucking hole 15 of the drill bit 4, the seawater 29 is sucked into the inner cavity of the drill bit 4 and forms a local negative pressure area at the bottom of the drill bit 4, so that jetting and sucking reverse circulation is realized. The multiphase slurry mixture at the bottom of the hole will travel up the central passage 12 of the drill pipe back to the surface under the combined action of the gas lift reverse circulation and the ejector reverse circulation.
The working principle of natural gas separation is as follows: multiphase flow slurry containing hydrate particles and returning upwards from the driving drill rod 3 enters a hydrate depressurization decomposition tank 17, the crushed hydrate particles are decomposed along with the rise of temperature and the reduction of pressure and are separated from gas and liquid, and the decomposed natural gas enters a gas storage tank 18 along a gas transmission pipe 19 for storage and provides methane gas for gas lift reverse circulation. The residual liquid-solid slurry flows into the solid-liquid separator 22 for liquid-solid separation, the separated silt is collected intensively, and the separated and purified seawater is injected into the slurry pump again for reuse.
The utility model provides a sea area gas hydrate gas lift reverse circulation drilling system and exploitation method utilizes the supplementary cutting tool of water jet broken hydrate rock stratum, adopts the gas lift reverse circulation to transport the mode of heterogeneous flow thick liquid and ground separation storage, is expected to solve the reservoir stratum collapse, the kick and the lost circulation scheduling problem that the gas hydrate conventional methods such as step-down, heat injection, replacement caused easily. The seawater 29 and the methane gas are used as circulating media without adding other pollutants, and are recycled, so that the non-diagenetic rock or diagenetic rock natural gas hydrate resources at the seabed can be exploited in an environment-friendly, efficient, safe and economic manner.
Claims (4)
1. The utility model provides a sea area natural gas hydrate gas lift reverse circulation well drilling system which characterized in that: the gas-water separation device comprises a drilling tower, a drilling platform, a driving drill rod and a drill bit, wherein the drilling tower is arranged on the top surface of the drilling platform, the driving drill rod is hung on the drilling tower, the drill bit is arranged on the lower portion of the driving drill rod, a three-channel drill rod is assembled between the drill bit and the driving drill rod, a gas-water tap is assembled at the top end of the driving drill rod, and the gas-water tap is connected with a natural gas separation system through a pipeline.
2. The offshore natural gas hydrate gas lift reverse circulation drilling system of claim 1, wherein: the lower end of the active drill rod is sleeved with a blowout preventer, the lower part of the blowout preventer is sleeved with a water-stop guide pipe, the lower end of the active drill rod is connected with the upper end of a three-channel drill rod and penetrates through a central channel of the blowout preventer and the water-stop guide pipe, the three-channel drill rod is composed of an outer layer drill rod, an inner layer drill rod and an air injection pipe, wherein the inner layer drill rod is inserted in the outer layer drill rod, the inner layer drill rod and the outer layer drill rod are of a concentric structure, the inner cavity of the inner layer drill rod is provided with the central channel, an annular channel is formed between the inner wall of the outer layer drill rod and the outer wall of the inner layer drill rod, the air injection pipe is inserted in the annular channel and arranged in parallel with the inner layer drill rod, the longitudinal connection mode of the inner layer drill rod is insertion connection, the outer layer drill rod is in the longitudinal direction by adopting a thread connection, the, the section structure of the driving drill rod corresponds to that of the three-channel drill rod, and the inner cavity of the driving drill rod is communicated with that of the three-channel drill rod.
3. The offshore natural gas hydrate gas lift reverse circulation drilling system according to claim 1 or 2, wherein: the drill bit is internally provided with a jetting and sucking hole and an alloy nozzle, the jetting and sucking hole is communicated with a central channel of the inner layer drill rod, the alloy nozzle is communicated with an annular channel between the inner layer drill rod and the outer layer drill rod, and an inner cavity of the drill bit is communicated with the central channel of the inner layer drill rod.
4. The offshore natural gas hydrate gas lift reverse circulation drilling system of claim 1, wherein: natural gas piece-rate system including step-down decomposition tank and gas holder, be connected through the gas-supply pipe between step-down decomposition tank and the gas holder, the export of the air water tap of initiative drilling rod top assembly is connected with the import of step-down decomposition tank through first pipeline, the row's cinder notch of step-down decomposition tank bottom is connected with air water tap's inlet through the second pipeline, be equipped with solid-liquid separator on the second pipeline in proper order, slush pump and surge tank, the surge tank is heatable formula, the gas holder is connected with air water tap's air inlet through the third pipeline, be equipped with methane storage tank and explosion-proof air compressor machine on the third pipeline.
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| CN202020787963.1U CN212027661U (en) | 2020-05-13 | 2020-05-13 | Sea area natural gas hydrate gas lift reverse circulation well drilling system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395962A (en) * | 2020-05-13 | 2020-07-10 | 吉林大学 | Sea natural gas hydrate gas lift reverse circulation well drilling system and exploitation method |
| WO2023070145A1 (en) * | 2021-10-29 | 2023-05-04 | Tri-Tube Drilling Systems Pty Ltd | Drill string and components therefor |
| CN111395962B (en) * | 2020-05-13 | 2024-04-26 | 吉林大学 | Sea area natural gas hydrate gas lift reverse circulation drilling system and exploitation method |
-
2020
- 2020-05-13 CN CN202020787963.1U patent/CN212027661U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395962A (en) * | 2020-05-13 | 2020-07-10 | 吉林大学 | Sea natural gas hydrate gas lift reverse circulation well drilling system and exploitation method |
| CN111395962B (en) * | 2020-05-13 | 2024-04-26 | 吉林大学 | Sea area natural gas hydrate gas lift reverse circulation drilling system and exploitation method |
| WO2023070145A1 (en) * | 2021-10-29 | 2023-05-04 | Tri-Tube Drilling Systems Pty Ltd | Drill string and components therefor |
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