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WO2021127855A1 - 一种双层连续管双梯度钻井系统 - Google Patents

一种双层连续管双梯度钻井系统 Download PDF

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Publication number
WO2021127855A1
WO2021127855A1 PCT/CN2019/127475 CN2019127475W WO2021127855A1 WO 2021127855 A1 WO2021127855 A1 WO 2021127855A1 CN 2019127475 W CN2019127475 W CN 2019127475W WO 2021127855 A1 WO2021127855 A1 WO 2021127855A1
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WO
WIPO (PCT)
Prior art keywords
double
drilling
layer
pipe
continuous
Prior art date
Application number
PCT/CN2019/127475
Other languages
English (en)
French (fr)
Inventor
钟林
王国荣
刘清友
周守为
余兴勇
李中
唐洋
付强
黄鑫
李炎军
刘和兴
Original Assignee
西南石油大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西南石油大学 filed Critical 西南石油大学
Priority to PCT/CN2019/127475 priority Critical patent/WO2021127855A1/zh
Priority to US17/044,125 priority patent/US11773653B2/en
Publication of WO2021127855A1 publication Critical patent/WO2021127855A1/zh

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Classifications

    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
    • E21B21/082—Dual gradient systems, i.e. using two hydrostatic gradients or drilling fluid densities
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/08—Casing joints
    • E21B17/085—Riser connections
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
    • E21B33/076—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations

Definitions

  • the invention relates to the field of deep-sea drilling, in particular to a double-layer coiled tube double-gradient drilling system.
  • the purpose of the present invention is to provide a double-layer coiled tubing double-gradient drilling system that can effectively widen the safety density window and improve the well control ability of dangerous formations.
  • the present invention provides the following solutions:
  • the present invention provides a double-layer coiled tubing double-gradient drilling system, which includes a double-layer coiled tubing system, a drilling fluid circulation system and a downhole lift pump system.
  • the double-layer coiled tubing system and the drilling fluid circulation system are installed on a drilling ship
  • the double-layer continuous tube system includes a double-layer continuous tube, a roller, a double-layer tube injection head and a conversion joint
  • the double-layer continuous tube includes a continuous outer tube and a continuous inner tube fixed inside the continuous outer tube through an adjusting sleeve
  • An annular channel is formed between the continuous outer tube and the continuous inner tube, the top of the double-layer continuous tube is wound on the drum, and is connected to the drilling fluid circulation system through the conversion joint
  • the drum is used to lay, recover or store the double-layer continuous pipe, and the conversion joint is installed on the drum; the bottom of the double-layer continuous pipe extends into the water through the double-layer pipe injection head, And the end of the double-layer c
  • the drilling fluid from the drilling fluid circulation system sequentially passes through the conversion joint, the annulus channel, the first test nipple, the bridge channel, the second test nipple, and the continuous inner tube Discharge into the well, and return fluid from the drilling well through the annulus channel, the second test nipple, the bridge channel, the first test nipple, the continuous inner tube and the conversion joint in sequence To the drilling fluid circulation system to realize drilling fluid circulation;
  • the drilling fluid circulation system is provided with a data monitoring system and a throttling control system signally connected to the data monitoring system.
  • the throttling control system is used for real-time control of the flow of drilling fluid and/or return fluid.
  • the data monitoring system is used for real-time monitoring of the circulation status of drilling fluid and/or return fluid.
  • the double-layer coiled tubing system further includes a tower-shaped derrick, the tower-shaped derrick is fixed on the drilling ship, a crane is installed on the top of the tower-shaped derrick, and the lower part of the crane is connected by a wire rope A traveling carriage, a large hook is installed under the traveling carriage for suspending the double-layer pipe injection head.
  • the double-layer pipe injection head includes a frame, a driving roller, a driven roller, and a power device.
  • the driving roller and the driven roller are arranged in parallel on the frame, and the driving roller and the driven roller are arranged in parallel on the frame.
  • the driven roller can clamp the double-layered continuous tube, and the power device is connected with the driving roller and drives the driving roller to rotate forward and backward.
  • the drilling fluid circulation system includes a drilling pump set, a solids control system, and a mud pool
  • the mud pool is connected to the conversion joint through an injection pipeline
  • the conversion joint is connected to the mud tank through a return pipeline
  • the drilling pump set is installed on the injection pipeline
  • the solids control system is installed on the return pipeline;
  • the solids control system includes a vibrating screen, a de-sander, a desilter, and Deaerator.
  • a riser is sleeved on the outside of the double-layer continuous pipe, and the riser is installed above the turntable through a riser chuck, and the riser chuck is connected to the turntable through a universal joint.
  • the turntable is installed on the drilling ship.
  • a diverter is installed on the top of the riser, and a bypass pipeline is drawn from the bottom of the solids control system to connect with the diverter;
  • the bypass pipeline and the return pipeline are both installed with the In a throttling control system, a flow meter and a pressure meter are respectively arranged on the return pipeline and the injection pipeline, and each of the pressure meters and each of the flow meters are signally connected to the data monitoring system;
  • a blowout preventer group is connected to the bottom, the blowout preventer group is located at the wellhead, a casing is installed in the well, the top of the casing is connected to the blowout preventer group, and the casing is connected to the continuous outer pipe.
  • the annulus between the gaps is filled with isolation fluid, which is located at the mud line and is used to separate the upper seawater from the drilling fluid below.
  • the conversion joint includes a housing and a double-layer conversion sleeve installed in the housing, and one end of the double-layer conversion sleeve is connected to the inner and outer pipes of the double-layer continuous pipe through a pipe connector. Connected, and the other end is connected to the return line and the injection line through a pipe connector.
  • a recovery short section is also provided between the second test short section and the power drill tool, the double-layer coiled tubing, the first test short section, the downhole lift pump system, and the The second test nipple, the recovery nipple, and the power drill are sequentially connected by a double-layer coiled tube adapter.
  • the driving component is a hydraulic motor or an electric motor, and when the lift pump is powered by the electric motor, the electric power of the electric motor is supplied through a cable or the double-layer coiled pipe with an insulating layer.
  • the double-layer coiled tubing double-gradient drilling system provided by the present invention can widen the safe drilling density window, effectively control the bottom hole pressure, greatly reduce the potential safety hazards such as blowout and lost circulation, save the risk control cost of deep-sea drilling, and solve the problem of deep-water drilling.
  • Technical problems such as well control, leakage and risk control of natural gas hydrate during the drilling process have strong practicability.
  • Figure 1 is a schematic diagram of the overall structure of the double-layer coiled tube double-gradient drilling system of the present invention
  • Fig. 2 is a partial enlarged view of A in Fig. 1;
  • Figure 3 is a schematic diagram of the structure of the downhole lift pump system of the present invention.
  • Figure 4 is a schematic diagram of the overall structure of the double-layer coiled tube double-gradient drilling system using a motor instead of a hydraulic motor according to the present invention
  • the reference signs are: 1. Crane; 2. Tower mast; 3. Traveling block; 4. Hook; 5. Double-layer coiled pipe; 6. Double-layer pipe injection head; 7. Riser chuck and Universal joint; 8. Splitter; 9. Riser; 10. Sea water; 11. Blowout preventer group and wellhead device; 12. Isolating fluid; 13. Casing; 14 drilling fluid; 15. Double-layer coiled tubing adapter ; 16. The first test sub section; 17. Lift pump; 18. Bridge channel; 19. Hydraulic motor; 20. The second test sub section; 21. Recovery sub section; 22. Power drill; 23. Drill bit ; 24. Reservoir; 25. Mud line; 26. Sea water; 27. Drilling ship; 28. Mud pool; 29. Drilling pump set; 30.
  • Solids control system 31. Pressure gauge; 32. Flow meter; 33. Return Pipeline; 34. Injection pipeline; 35. Bypass pipeline; 36. The first throttling control system; 37. The second throttling control system; 38. Adapter; 39. Roller; 40. Cable; 41. Motor.
  • this embodiment provides a double-layer coiled tubing dual-gradient drilling system, including a double-layer coiled tubing system, a drilling fluid circulation system, and a downhole lift pump system, a double-layer coiled tubing system and a drilling fluid circulation system.
  • the system is installed on the drilling ship 27;
  • the double-layer coiled pipe system includes the double-layer coiled pipe 5, the drum 29, the double-layer pipe injection head 6 and the conversion joint 38.
  • the double-layer coiled pipe 5 includes the continuous outer pipe and is fixed to the continuous
  • the continuous inner tube inside the outer tube forms an annulus channel between the continuous outer tube and the continuous inner tube.
  • the top of the double-layer continuous tube 5 is wound on the shaft of the drum 39, and is connected to the drilling fluid circulation system through a conversion joint 38.
  • the drum 39 is used to lay, recycle or store the double-layer coiled pipe 5, the conversion joint 38 is installed on the drum 39; the bottom of the double-layer coiled pipe 5 is extended into the sea water 26 and below the mud line 25 through the double-layer pipe injection head 6, and
  • the end of the double-layer coiled tubing 5 is provided with a downhole lift pump system, a power drill tool 22, and a drill bit 23 connected to the power drill tool 22.
  • the two ends of the downhole lift pump system are respectively provided with a first test nipple 16 and a first test section 16
  • the second test sub 20 the downhole lift pump system includes a lift pump 17, a bridge passage 18 and a driving component arranged in sequence.
  • the two ends of the bridge passage 18 are respectively connected to the drilling fluid outlet and the return fluid inlet, in this embodiment ,
  • the driving component is preferably a hydraulic motor 19.
  • the drilling fluid (power fluid) 14 is discharged from the drilling fluid circulation system through the adapter 38, the annulus channel, the first test nipple 16, the bridge channel 18, the second test nipple 20 and the coiled inner tube into the well in sequence, and returns The fluid from the well returns to the drilling fluid circulation system through the annulus channel, the second test nipple 20, the bridge channel 18, the first test nipple 16, the coiled inner tube and the conversion joint 38 in order to realize the circulation of the drilling fluid.
  • the first test puppet 16 and the second test puppet 20 are respectively installed at both ends of the suction and discharge ports of the lift pump 17 for monitoring the inlet and outlet pressure, flow and temperature parameters of the lift pump 17.
  • the drilling fluid circulation system is equipped with a data monitoring system and a throttling control system signal-connected to the data monitoring system.
  • the throttling control system is used for real-time control of the flow of drilling fluid and/or return fluid
  • the data monitoring system is used for monitoring the drilling fluid. And/or the circulation status of the return fluid is monitored in real time.
  • the double-layer coiled tubing system also includes a tower derrick 2, which is fixed on the drilling ship 27, and a crane 1 is installed on the top of the tower derrick 2.
  • the lower part of 1 is connected to a traveling block 3 by a wire rope, and a large hook 4 is installed under the traveling block 3 to hang the double-layer pipe injection head 6.
  • the traveling block 3 is preferably a movable pulley block that is connected to the crown block 1 by a wire rope and moves up and down inside the derrick.
  • the above-mentioned crown block 1 and traveling block 3 are both existing structures, and are used to adjust the lifting and lowering of the hook 4 in this embodiment.
  • the double-layer pipe injection head 6 includes a frame, a driving roller, a driven roller, and a power device.
  • the driving roller and the driven roller are arranged in parallel on the frame, and the double-layer continuous pipe 5 is clamped on the frame.
  • the power unit is connected with the driving roller and drives the driving roller to rotate forward and backward.
  • the double-layer coiled tube 5 can be lifted or lowered to ensure the continuity of deep water. operation.
  • the specific structural composition and working principle of the above-mentioned double-layer tube injection head 6 are in the prior art, and will not be repeated here.
  • the drilling fluid circulation system includes a drilling pump set 29, a solids control system 30, and a mud pool 28.
  • the mud pool 28 is connected to an adapter 38 through an injection line 34, and the adapter 38 is connected to the mud pool through a return line 33.
  • the drilling pump group 29 is installed on the injection pipeline 34
  • the solids control system 30 is installed on the return pipeline 33;
  • the solids control system 30 includes a vibrating screen, a de-sander, a desilter and a desilter which are arranged in sequence along the flow direction of the return fluid.
  • the gas device is used to remove the cuttings, sand and gas contained in the return fluid; at the same time, the mud pool 28 can accumulate the return fluid after passing through the solids control system 30, and provide power fluid to the drilling pump group 29 (drilling Liquid 14) forms a circulation.
  • the structural composition, working principle and applicable working conditions of the solids control system 30 are well known in the art, and will not be repeated here.
  • the drilling pump set 29 may preferably be provided with 3 to 4 sets of pumps, which work in parallel, and open one or more of the pumps for simultaneous operation according to the required pump fluid pressure.
  • a riser 9 is sleeved on the outside of the double-layer coiled pipe 5, and the riser 9 is installed above the turntable through a riser chuck, and the riser chuck is connected to the turntable through a universal joint, and the turntable is installed at Drill ship 27.
  • the riser chuck and the universal joint 7 are installed above the turntable.
  • the riser chuck is used to lift the riser string and clamp the riser 9 when connecting a single one. It supports the riser 9 and blowout prevention.
  • the weight of the device assembly facilitates quick connection and disassembly of the riser 9 joints, and the universal joint can compensate for the riser deviation caused by the flow of sea water 10.
  • a diverter 8 is installed on the top of the riser 9, and a bypass line 35 is connected to the diverter 8 from the bottom of the solids control system 30; the bypass line 35 and the return line
  • the second throttling control system 37 and the first throttling control system 36 are respectively installed on the 33.
  • the return line 33 and the injection line 34 are equipped with a flow meter 32 and a pressure meter 31, and each pressure meter 31 and each flow meter 32 They are all connected to the signal of the data monitoring system; the bottom of the riser 9 is connected with a blowout preventer group, which is located at the wellhead, as shown in Figure 1, the blowout preventer group and the wellhead device 11, with casing 13 installed in the well , Used to support the well wall and keep the well wall stable, the top of the casing 13 is connected with the blowout preventer group.
  • the blowout preventer group and the wellhead device 11 include a deep water blowout preventer group and a wellhead device.
  • the blowout preventer group is composed of two sets of annular blowout preventers and four sets of ram blowout preventers, which can seal the annular space of the well string , And effectively shut in well after cutting the cable and double-layer coiled tubing 5,
  • the wellhead equipment includes wellhead plate, steering frame, casing head set and special connector, etc., used to fix the subsea well position, hang the casing head, and guide the drilling Tools and other underwater equipment, measuring wellhead pressure, etc.
  • the structure and working principle of the above-mentioned blowout preventer group are well known in the art, and will not be repeated here.
  • the annulus between the casing 13 and the continuous outer tube of the double-layered coiled tube 5 is filled with an isolating fluid 12, which is located at the mud line 25 and is used to separate the upper seawater from the drilling fluid below .
  • the isolation fluid 12 is preferably a partitioned special gel.
  • the lowering of the drill bit 23 is stopped and the inner tube passage of the double-layer coiled tube 5 is closed and opened Bypass the pipeline 35 and inject a piece of isolation fluid into the annulus between the double-layer coiled pipe 5 and the casing 13, driven by the power fluid, the isolation fluid 12 reaches the mud line in the annulus between the double-layer coiled pipe 5 and the casing 13 After around 25, continue to lower the drill bit 23 to prepare for drilling.
  • the conversion joint 38 includes a housing, a double-layer conversion sleeve and a rotary sealing mechanism installed in the housing, etc.
  • the double-layer conversion sleeve includes two coaxially independent layers.
  • the channel is the inner tube channel and the inner and outer tube annulus channels.
  • One end of the inner tube channel is connected to the continuous inner tube of the double-layer continuous tube 5 through the inner tube connector, and one end of the inner and outer tube annulus channel is connected to the double-layer through the outer tube connector.
  • the annulus channels of the coiled tube 5 are connected.
  • the other ends of the inner tube channel and the inner and outer tube annulus channels are respectively connected to the return line 33 and the injection line 34 through a tube connector, and the drilling fluid 14 is connected from the conversion joint 38 through the injection line 34.
  • the above-mentioned inner and outer pipe annulus channel enters the annulus channel of the double-layer continuous pipe 5, and the return fluid enters the return line 33 from the aforementioned inner pipe passage of the adapter 38 through the inner pipe of the double-layer continuous pipe 5, thereby realizing the power fluid from the double
  • the conversion connector 38 is an existing structure, and its specific working principle will not be repeated here.
  • the second test nipple 20 and the power drill tool 22 there is also a recovery nipple 21, a double-layer coiled tube 5, a first test nipple 16, and downhole lifting
  • the lift pump system, the second test sub-joint 20, the recovery sub-joint 21, and the power drill tool 22 are connected in turn by a double-layer coiled tube adapter 15.
  • a double-layer coiled tube adapter 15 for the structure and working principle of the double-layer coiled tube adapter 15, please refer to the application number: CN201811244524.X invention patent.
  • the drilling fluid channel is connected to the drilling pump set 29, the injection pipeline 34, the conversion joint 38, the annulus channel of the double-layer coiled pipe 5, the outer channel of the first test sub 16, the outer channel of the lift pump 17, and the bridge.
  • the return channel 18, the inner channel of the second test sub 20, the inner channel of the recovery sub 21, the power drill 22, and the drill bit 23 are connected; the return fluid channel is connected with the outer channel of the recovery sub 21 and the second The outer channel of the test sub 20, the bridge channel 18, the inner channel of the lift pump 17, the inner channel of the first test sub 16, the inner tube of the double-layer coil 5, the conversion joint 38, the return pipeline 33, and the solid control
  • the system 30 is connected.
  • the first throttling control system 36 and the second throttling control system 38 have the same structure and are composed of an electronically controlled throttle valve and a control system, etc., which can control the inner pipe passage (return line 33) of the double-layer continuous pipe 5 ) And the opening and closing of the bypass line 35.
  • the data monitoring system is used to monitor the injection pressure and flow rate of the drilling pump group 29, the return fluid pressure and flow rate, the level and pressure of the isolation fluid 12, the inlet and outlet pressure and flow rate of the lift pump 17, and the return fluid flow rate and the drilling pump 29 The displacement is controlled.
  • the drilling fluid 14 (the direction indicated by the black arrow in Figure 3 is the flow direction of the drilling fluid) is injected from the drilling pump set 29, enters the annulus channel of the double-layer coiled tube 5 through the adapter 38, and then passes through the first The outer passage of the test puppet 26 to the lift pump 17, and then enters the inner passage of the second test puppet 20 under the action of the bridge passage 18, and then passes through the inner passage of the recovery puppet 21, the power drill 22 and the drill bit 23 enters the bottom of the well to break the rock and carry cuttings; the return fluid (the direction indicated by the white arrow in Figure 3 is the flow direction of the return fluid) sequentially enters the outer channel of the recovery sub 21, the second test sub 20, and then Enter the internal channel of the lift pump 17 through the bridge channel 18 to obtain energy, and then sequentially pass through the internal channel of the first test short section 16, the internal tube of the double-layer continuous tube 5, the conversion joint 38, and the first throttling control system 36 to enter the solids control system.
  • the system 30 returns to the mud
  • the data monitoring system judges the bottom hole condition by monitoring the pressure and level of the isolation fluid 12, adjusts its throttle valve opening in real time through the first throttle control system 36, and adjusts the displacement of the drilling pump set 29 through the data monitoring system. Adjust the difference between the entering and returning of the drilling fluid 14 to adjust the lift of the lift pump 17, change the pressure of the inner tube liquid column of the double-layer coiled tubing 5 acting on the bottom of the well, so that the isolation fluid 12 is dynamically balanced at the equilibrium position , Realize the regulation and maintenance of pressure gradient.
  • the upper sea water 10 and the lower drilling fluid 14 are separated by the spacer fluid 12 to form three different fluid columns.
  • the double-layer coiled pipe 5 constitutes the channel for the injection and return of the drilling fluid 14 and is realized by the circulation of the lifting pump 17 .
  • the riser 9 is used for the three-stage liquid column, the seawater 10 between the double-layer coiled pipe 5 and the riser 9 and the drilling fluid 14 between the double-layer coiled pipe 5 and the casing 13 are separated by the isolation fluid 12.
  • the outer wall of the inner tube and the inner wall of the outer tube of the double-layer coiled tube 5 can be insulated to serve as coaxial cables, or the cable 40 can be inserted into the annulus of the double-layer coiled tube 5 for power supply.
  • the inner pipe channel of the double-layer coiled tube 5 is closed through the first throttle control system 36, and the bypass line is opened through the second throttle control system 37 35.
  • the return liquid flows back through the annulus between the double-layer coiled pipe 5 and the well wall and the annulus between the double-layer coiled pipe 5 and the riser 9, and enters the bypass line 35 through the upper end of the riser 9 and then enters the solids control. System 30.
  • this embodiment is equipped with a double-layer coiled tubing system, isolation fluid, downhole lift pump system, throttling control system, and data monitoring system;
  • the power fluid is injected by the drilling pump group and passed through
  • the conversion joint enters the double-layer tube annulus, passes through the downhole lift pump, enters the double-layer coiled tube inner tube through the bridge channel, and then enters the bottom of the well through the power drilling tool and the drill bit;
  • the return fluid enters the double-layer coiled tube annulus through the recovery hole
  • the channel enters the double-layer coiled tube inner tube through the bridge channel and enters the downhole lifting pump, and then enters the solids control system through the conversion joint and the throttling control system;
  • the invention does not need to connect the drill pipe, saves drilling time, and passes the isolation fluid
  • the monitoring and the regulation of the drilling pump set realize the regulation of bottom hole pressure gradient, solve the problem of narrow safety drilling density window, have the advantages of reducing drilling costs and risks, improving efficiency,
  • this embodiment provides a double-layer coiled tube double-gradient drilling system, in which the driving component is preferably a motor 41.
  • the driving component is preferably a motor 41.
  • the lift pump 17 uses the motor 41 instead of the hydraulic motor 19 to provide power, the electric power is passed through
  • the supply of the cable 40 or the double-layer coiled pipe 5 with insulating layer can reduce the energy consumption of the drilling fluid 14 before reaching the bottom of the well, and reduce the burden of the drilling pump group 29.

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Abstract

一种双层连续管双梯度钻井系统，在常规钻井装备的基础上，包括双层连续管系统、隔离液、井下举升泵系统、节流控制系统和数据监控系统；动力液由钻井泵组（29）注入，经过转换接头（38）进入双层管环空中，经过井下举升泵，通过桥式通道进入双层连续管内管，又经过动力钻具（22）和钻头（23）进入井底；返回液经过回收孔进入双层连续管（5）的环空通道，再通过桥式通道（18）进入双层连续管（5）内管进入井下举升泵（17），然后依次经过转换接头和节流控制系统进入固控系统；本发明不需连接钻杆，节约钻井时间，通过隔离液的监测和钻井泵组的调控实现井底压力梯度调控，解决安全钻井密度窗口窄的问题，具有降低钻井成本和风险，提高效率的优点，实用性强。

Description

一种双层连续管双梯度钻井系统 技术领域
本发明涉及深海钻井领域，特别是涉及一种双层连续管双梯度钻井系统。
背景技术
目前，全球能源问题越来越严峻，陆地上和浅海区域的油气资源远远不能满足人类的需要。深水油气资源的勘探和开发已经成为当前的开发热点。然而，在深海区域进行钻井施工的时候，存在安全压力窗口窄，海底地层弱胶结导致井筒压力控制困难以及井壁稳定性差等问题，导致钻井安全风险高、成本高。
因此，为推进深水海洋油气的勘探与开发，如何针对深海油气和浅层水合物开发时的面临易漏产层、海床疏松表层钻井安全性差、地层漏失压力低以及安全密度窗口窄等难题提出一种高效、安全的钻井工艺，是目前亟待解决的问题。
发明内容
本发明的目的是提供一种可有效拓宽安全密度窗口，提高危险地层井控能力的双层连续管双梯度钻井系统。
为实现上述目的，本发明提供了如下方案：
本发明提供一种双层连续管双梯度钻井系统，包括双层连续管系统、钻井液循环系统和井下举升泵系统，所述双层连续管系统和所述钻井液循环系统安装于钻井船上；所述双层连续管系统包括双层连续管、滚筒、双层管注入头和转换接头，所述双层连续管包括连续外管和通过调节套固定于所述连续外管内部的连续内管，所述连续外管与所述连续内管之间形成环空通道，所述双层连续管的顶部缠绕于所述滚筒上，并通过所述转换接头与所述钻井液循环系统连接，所述滚筒用于布放、回收或存储所述双层连续管，所述转换接头安装于所述滚筒上；所述双层连续管的底部通过所述双层管注入头伸入水下，且所述双层连续管的末端设置所述井下举升泵系统、动力钻具和钻头，所述井下举升泵系统的两端分别设置有第一测试短节和第二测试短节，所述井下举升泵系统包括依次设置的举升泵、桥式通道和驱动部件，所述桥式通道的两端分别连接钻 井液出口和返回液入口；
钻井液从所述钻井液循环系统中依次经所述转换接头、所述环空通道、所述第一测试短节、所述桥式通道、所述第二测试短节和所述连续内管排出至井内，返回液从钻井内依次经所述环空通道、所述第二测试短节、所述桥式通道、所述第一测试短节、所述连续内管和所述转换接头返回至所述钻井液循环系统中，实现钻井液循环；
所述钻井液循环系统内设置有数据监控系统和与所述数据监控系统信号连接的节流控制系统，所述节流控制系统用于对钻井液和/或返回液的流量实时调控，所述数据监控系统用于对钻井液和/或返回液的循环状态进行实时监控。
可选的，所述双层连续管系统还包括塔形井架，所述塔形井架固定于所述钻井船上，所述塔形井架的顶部安装有天车，所述天车的下方通过钢丝绳连接一游车，所述游车下方安装一大钩用于悬挂所述双层管注入头。
可选的，所述双层管注入头包括机架、主动滚轮、从动滚轮和动力装置，所述主动滚轮和所述从动滚轮平行设置在所述机架上，所述主动滚轮和所述从动滚轮能够将所述双层连续管夹持，所述动力装置与所述主动滚轮连接，并驱动所述主动滚轮正反转动。
可选的，所述钻井液循环系统包括钻井泵组、固控系统和泥浆池，所述泥浆池通过注入管线与所述转换接头连接，所述转换接头通过返回管线与所述泥浆池连接，所述钻井泵组设置于所述注入管线上，所述固控系统安装于所述返回管线上；所述固控系统包括沿液体流动方向依次设置的振动筛、除砂器、除泥器和除气器。
可选的，所述双层连续管的外部套设有隔水管，所述隔水管通过隔水管卡盘安装在转盘上方，所述隔水管卡盘通过万向节与所述转盘连接，所述转盘安装在所述钻井船上。
可选的，所述隔水管的顶部安装有分流器，所述固控系统的底部引出有旁通管线与所述分流器连接；所述旁通管线和所述返回管线上均安装有所述节流控制系统，所述返回管线和所述注入管线上分别设置有流量表和压力表，各所 述压力表和各所述流量表均与所述数据监控系统信号连接；所述隔水管的底部连接有防喷器组，所述防喷器组位于井口处，钻井内安装有套管，所述套管顶部与所述防喷器组连接，所述套管与所述连续外管之间的环空内填充有隔离液，所述隔离液位于泥线处，用于分隔上部海水和下方的钻井液。
可选的，所述转换接头包括壳体和安装于所述壳体内的双层转换套管，所述双层转换套管的一端通过管连接器与所述双层连续管的内、外管连接，另一端通过管连接器与所述返回管线和所述注入管线连接。
可选的，所述第二测试短节与所述动力钻具之间还设置有回收短节，所述双层连续管、所述第一测试短节、所述井下举升泵系统、所述第二测试短节和所述回收短节以及所述动力钻具依次通过双层连续管转接头连接。
可选的，所述驱动部件为液力马达或电机，且当所述举升泵通过电机提供动力时，所述电机的电力通过电缆或有绝缘层的所述双层连续管供给。
本发明相对于现有技术取得了以下技术效果：
本发明提供的双层连续管双梯度钻井系统，能够拓宽安全钻井密度窗口，井底压力得到有效控制，大大减少了井喷、井漏等安全隐患，节约了深海钻井的危险控制成本，解决了深水钻井过程中井控、漏失和天然气水合物的风险控制等技术难题，实用性强。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明双层连续管双梯度钻井系统的总体结构示意图；
图2为图1的A处局部放大视图；
图3为本发明井下举升泵系统的结构示意图；
图4为本发明使用电机代替液力马达的双层连续管双梯度钻井系统的总体结构示意图；
其中，附图标记为：1.天车；2.塔形井架；3.游车；4.大钩；5.双层连续管； 6.双层管注入头；7.隔水管卡盘及万向节；8.分流器；9.隔水管；10.海水；11.防喷器组及井口装置；12.隔离液；13.套管；14钻井液；15.双层连续管转接头；16.第一测试短节；17.举升泵；18.桥式通道；19.液力马达；20.第二测试短节；21.回收短节；22.动力钻具；23.钻头；24.储层；25.泥线；26.海水；27.钻井船；28.泥浆池；29.钻井泵组；30.固控系统；31.压力表；32.流量表；33.返回管线；34.注入管线；35.旁通管线；36.第一节流控制系统；37.第二节流控制系统；38.转换接头；39.滚筒；40.电缆；41.电机。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。
实施例一：
如图1-3所示，本实施例提供一种双层连续管双梯度钻井系统，包括双层连续管系统、钻井液循环系统和井下举升泵系统，双层连续管系统和钻井液循环系统安装于钻井船27上；双层连续管系统包括双层连续管5、滚筒29、双层管注入头6和转换接头38，双层连续管5包括连续外管和通过调节套固定于连续外管内部的连续内管，连续外管与连续内管之间形成环空通道，双层连续管5的顶部缠绕于滚筒39的转轴上，并通过转换接头38与钻井液循环系统连接，滚筒39用于布放、回收或存储双层连续管5，转换接头38安装于滚筒39上；双层连续管5的底部通过双层管注入头6伸入海水26中及泥线25以下，且双层连续管5的末端设置井下举升泵系统、动力钻具22和与所述动力钻具22连接的钻头23，井下举升泵系统的两端分别设置有第一测试短节16和第二测试短节20，井下举升泵系统包括依次设置的举升泵17、桥式通道18和驱动部件，桥式通道18的两端分别连接钻井液出口和返回液入口，于本实施例中，驱动部件优选为液力马达19。
钻井液(动力液)14从钻井液循环系统中依次经转换接头38、环空通道、第一测试短节16、桥式通道18、第二测试短节20和连续内管排出至井内，返回液则从钻井内依次经环空通道、第二测试短节20、桥式通道18、第一测试短节16、连续内管和转换接头38返回至钻井液循环系统中，实现钻井液的循环；第一测试短节16和第二测试短节20分别安装在举升泵17吸入和排出口两端，用于监测举升泵17进出口压力、流量和温度参数。
钻井液循环系统内设置有数据监控系统和与数据监控系统信号连接的节流控制系统，节流控制系统用于对钻井液和/或返回液的流量实时调控，数据监控系统用于对钻井液和/或返回液的循环状态进行实时监控。
于本具体实施例中，如图1所示，双层连续管系统还包括塔形井架2，塔形井架2固定于钻井船27上，塔形井架2的顶部安装有天车1，天车1的下方通过钢丝绳连接一游车3，游车3下方安装一大钩4用于悬挂双层管注入头6。其中，游车3优选为通过钢丝绳与天车1相连的在井架内部作上下运动的动滑轮组。上述天车1和游车3均为现有结构，于本实施例中用于对大钩4进行升降调节。
进一步地，本实施例中，双层管注入头6包括机架、主动滚轮、从动滚轮和动力装置，主动滚轮和从动滚轮平行设置在机架上，双层连续管5被夹持于主动滚轮和从动滚轮之间，动力装置与主动滚轮连接，并驱动主动滚轮正反转动，通过主动滚轮的正反转动，能对双层连续管5进行上提或下放作业，保证深水的连续作业。上述双层管注入头6的具体结构组成和工作原理均为现有技术，在此不再赘述。
进一步地，本实施例中，钻井液循环系统包括钻井泵组29、固控系统30和泥浆池28，泥浆池28通过注入管线34与转换接头38连接，转换接头38通过返回管线33与泥浆池28连接，钻井泵组29设置于注入管线34上，固控系统30安装于返回管线33上；固控系统30包括沿返回液流动方向依次设置的振动筛、除砂器、除泥器和除气器等，用于去除返回液中含有的岩屑、沙粒和气体等；同时泥浆池28可将通过固控系统30后的返回液积累起来，并向钻井泵组29提供动力液(钻井液14)形成循环。其中，固控系统30的结构组成、工作原理以及适用工况均为本领域公知，在此不再赘述。钻井泵组29中 可优选设置3～4组泵，并联工作，根据所需泵液压力开启其中的一个或多个泵同时作业。
进一步地，本实施例中，双层连续管5的外部套设有隔水管9，隔水管9通过隔水管卡盘安装在转盘上方，隔水管卡盘通过万向节和转盘连接，转盘安装在钻井船27上。如图1所示，其中，隔水管卡盘及万向节7安装在转盘上方，隔水管卡盘用于隔水管柱提升及接单根时夹紧隔水管9，支撑隔水管9与防喷器组的重量，便于快速连接和拆卸隔水管9接头，万向节则能够补偿由于海水10流动产生的隔水管偏移。
进一步地，本实施例中，如图1所示，隔水管9的顶部安装有分流器8，固控系统30的底部引出有旁通管线35与分流器8连接；旁通管线35和返回管线33上分别安装有第二节流控制系统37和第一节流控制系统36，返回管线33和注入管线34上均设置有流量表32和压力表31，且各压力表31和各流量表32均与数据监控系统信号连接；隔水管9的底部连接有防喷器组，防喷器组位于井口处，如图1所示的防喷器组及井口装置11，钻井内安装有套管13，用于支撑井壁，保持井壁稳定，套管13顶部与防喷器组连接。其中，防喷器组及井口装置11包含有深水防喷器组和井口装置，防喷器组由两套环形防喷器和四套闸板防喷器组成，能够封闭入井管柱的环形空间，并在剪断入井电缆及双层连续管5后有效关井，井口装置包括井口盘、导向架、套管头组和专用连接器等，用于固定海底井位、悬挂套管头、引导钻具及其他水下设备、测量井口压力等。上述防喷器组的结构以及工作原理均为本领域公知，在此不再赘述。
如图1所示，套管13与双层连续管5的连续外管之间的环空内填充有隔离液12，隔离液12位于泥线25处，用于分隔上部海水和下方的钻井液。所述的隔离液12优选为一种隔断式特种凝胶，当开钻前，钻头23下放至泥线25以下一定距离后，停止下放钻头23并关闭双层连续管5的内管通道，打开旁通管线35并向双层连续管5与套管13的环空中注入一截隔离液，在动力液驱动下，待隔离液12在双层连续管5与套管13的环空中到达泥线25附近后，继续下放钻头23准备钻进。
进一步地，本实施例中，如图1所示，转换接头38包括壳体、安装于壳体内的双层转换套管和旋转密封机构等，双层转换套管包括两层同轴相互独立的通道，即内管通道和内外管环空通道，内管通道的一端通过内管连接器与双层连续管5的连续内管连接，内外管环空通道的一端通过外管连接器与双层连续管5的环空通道连接，对应的，内管通道和内外管环空通道的另一端分别通过管连接器与返回管线33和注入管线34连接，钻井液14通过注入管线34从转换接头38的上述内外管环空通道进入双层连续管5的环空通道中，返回液通过双层连续管5的内管从转换接头38的上述内管通道进入返回管线33，从而实现动力液从双层连续管5环空通道连续流入和返回液从双层连续管5的内管连续流出的功能。该转换接头38为一种现有结构，其具体工作原理在此不再赘述。
进一步地，本实施例中，如图1所示，第二测试短节20与动力钻具22之间还设置有回收短节21，双层连续管5、第一测试短节16、井下举升泵系统、第二测试短节20和回收短节21以及动力钻具22依次通过双层连续管转接头15连接，其中，双层连续管转接头15的结构组成以及工作原理参见申请号为CN201811244524.X的发明专利。钻井液通道从上到下依次与钻井泵组29、注入管线34、转换接头38、双层连续管5的环空通道、第一测试短节16的外通道、举升泵17外通道、桥式通道18、第二测试短节20的内通道、回收短节21的内通道、动力钻具22、钻头23连通；返回液通道从下到上依次与回收短节21的外通道、第二测试短节20的外通道、桥式通道18、举升泵17的内通道、第一测试短节16的内通道、双层连续管5的内管、转换接头38、返回管线33、固控系统30连通。
本实施例中，第一节流控制系统36和第二节流控制系统38结构相同，由电控节流阀和控制系统等组成，可以控制双层连续管5的内管通道(返回管线33)和旁通管线35的开闭。数据监控系统则用于监测钻井泵组29注入压力和流量、返回液压力和流量、隔离液12的液位和压力、举升泵17进出口压力和流量，并对返回液流量和钻井泵29的排量进行控制。
下面基于本实施例提供的双层连续管双梯度钻井系统，进行具体钻井方法的说明。
首先，将钻井液14(图3中的黑色箭头所指方向为钻井液的流动方向)由钻井泵组29注入，经过转换接头38进入双层连续管5的环空通道中，再经过第一测试短节26外通道到举升泵17，之后在桥式通道18的变向作用下进入第二测试短节20的内通道，又经过回收短节21的内通道、动力钻具22和钻头23进入井底破碎岩石并携带岩屑；返回液(图3中的白色箭头所指方向为返回液的流动方向)依次进入回收短节21的外通道、第二测试短节20外通道，再通过桥式通道18进入举升泵17内通道获得能量，然后依次经过第一测试短节16内通道、双层连续管5的内管、转换接头38、第一节流控制系统36进入固控系统30回到泥浆池28中，由数据监控系统对循环进行实时监控。
钻井泵组29开钻前，将双层连续管5的内管通道打开并关闭旁通管线35，使用小排量进行循环，待钻井液14循环畅通后，调整泵排量开始钻进。
数据监控系统通过监测隔离液12的压力和液位的变化判断井底状况，通过第一节流控制系统36实时调整其节流阀开度、通过数据监控系统调整钻井泵组29的排量，对钻井液14进入和返出的差值进行调控进而调整举升泵17的扬程，改变双层连续管5的内管液柱作用于井底的压力，让隔离液12在平衡位置处动态平衡，实现压力梯度的调控与维持。
本实施例中，通过隔离液12分隔上部海水10和下方钻井液14组成三段不同液柱，双层连续管5构成钻井液14注入和返回的通道，并由举升泵17形成循环来实现。三段液柱在使用隔水管9情况下，通过隔离液12分隔双层连续管5与隔水管9之间的海水10和双层连续管5与套管13之间的钻井液14实现。
在无隔水管9的情况下，通过在防喷器组上部安装滑动封隔器隔开来实现，滑动封隔器可实现在双层连续管5运动过程中的滑动密封，其上有密度控制阀用于防止隔离液12流出和海水26自由流入与流出，进而形成海水26、隔离液12和钻井液14三段液柱。该隔开技术为本领域公知技术，在此不再赘述。
井下监测或其他设备的供电可将双层连续管5的内管外壁和外管内壁经过绝缘处理后充当同轴电缆，或者在双层连续管5的环空通道中穿入电缆40进行供电。
当数据监控系统监测出返出液流量很小或无返出液时，通过第一节流控制系统36关闭双层连续管5的内管通道再通过第二节流控制系统37打开旁通管线35，返出液通过双层连续管5与井壁的环空及双层连续管5与隔水管9的环空返出，通过隔水管9上端分流器8进入旁通管线35再进入固控系统30中。
由此可见，本实施例在常规钻井装备的基础上，设置了双层连续管系统、隔离液、井下举升泵系统、节流控制系统和数据监控系统；动力液由钻井泵组注入，经过转换接头进入双层管环空中，经过井下举升泵，通过桥式通道进入双层连续管内管，又经过动力钻具和钻头进入井底；返回液经过回收孔进入双层连续管的环空通道，再通过桥式通道进入双层连续管内管并进入井下举升泵，然后依次经过转换接头和节流控制系统进入固控系统；本发明不需连接钻杆，节约钻井时间，通过隔离液的监测和钻井泵组的调控实现井底压力梯度调控，解决安全钻井密度窗口窄的问题，具有降低钻井成本和风险，提高效率的优点，实用性强。
实施例二：
如图4所示，本实施例提供一种双层连续管双梯度钻井系统，其中的驱动部件优选为电机41，当举升泵17使用电机41代替液力马达19提供动力时，其电力通过电缆40或有绝缘层的双层连续管5供给，可以减少钻井液14在到达井底前的能量消耗，减轻钻井泵组29的负担。
本实施例的其他结构均与实施例一相同，在此不再赘述。
需要说明的是，对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内，不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
本发明中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改 变之处。综上所述，本说明书内容不应理解为对本发明的限制。

Claims (9)

  1. 一种双层连续管双梯度钻井系统，其特征在于：包括双层连续管系统、钻井液循环系统和井下举升泵系统，所述双层连续管系统和所述钻井液循环系统安装于钻井船上；所述双层连续管系统包括双层连续管、滚筒、双层管注入头和转换接头，所述双层连续管包括连续外管和通过调节套固定于所述连续外管内部的连续内管，所述连续外管与所述连续内管之间形成环空通道，所述双层连续管的顶部缠绕于所述滚筒上，并通过所述转换接头与所述钻井液循环系统连接，所述滚筒用于布放、回收或存储所述双层连续管，所述转换接头安装于所述滚筒上；所述双层连续管的底部通过所述双层管注入头伸入水下，且所述双层连续管的末端设置所述井下举升泵系统、动力钻具和钻头，所述井下举升泵系统的两端分别设置有第一测试短节和第二测试短节，所述井下举升泵系统包括依次设置的举升泵、桥式通道和驱动部件，所述桥式通道的两端分别连接钻井液出口和返回液入口；
    钻井液从所述钻井液循环系统中依次经所述转换接头、所述环空通道、所述第一测试短节、所述桥式通道、所述第二测试短节和所述连续内管排出至井内，返回液从钻井内依次经所述环空通道、所述第二测试短节、所述桥式通道、所述第一测试短节、所述连续内管和所述转换接头返回至所述钻井液循环系统中，实现钻井液循环；
    所述钻井液循环系统内设置有数据监控系统和与所述数据监控系统信号连接的节流控制系统，所述节流控制系统用于对钻井液和/或返回液的流量实时调控，所述数据监控系统用于对钻井液和/或返回液的循环状态进行实时监控。
  2. 根据权利要求1所述的双层连续管双梯度钻井系统，其特征在于：所述双层连续管系统还包括塔形井架，所述塔形井架固定于所述钻井船上，所述塔形井架的顶部安装有天车，所述天车的下方通过钢丝绳连接一游车，所述游车下方安装一大钩用于悬挂所述双层管注入头。
  3. 根据权利要求1所述的双层连续管双梯度钻井系统，其特征在于：所述双层管注入头包括机架、主动滚轮、从动滚轮和动力装置，所述主动滚轮和所述从动滚轮平行设置在所述机架上，所述主动滚轮和所述从动滚轮能够将所 述双层连续管夹持，所述动力装置与所述主动滚轮连接，并驱动所述主动滚轮正反转动。
  4. 根据权利要求1所述的双层连续管双梯度钻井系统，其特征在于：所述钻井液循环系统包括钻井泵组、固控系统和泥浆池，所述泥浆池通过注入管线与所述转换接头连接，所述转换接头通过返回管线与所述泥浆池连接，所述钻井泵组设置于所述注入管线上，所述固控系统安装于所述返回管线上；所述固控系统包括沿液体流动方向依次设置的振动筛、除砂器、除泥器和除气器。
  5. 根据权利要求4所述的双层连续管双梯度钻井系统，其特征在于：所述双层连续管的外部套设有隔水管，所述隔水管通过隔水管卡盘安装在转盘上方，所述隔水管卡盘通过万向节与所述转盘连接，所述转盘安装在所述钻井船上。
  6. 根据权利要求5所述的双层连续管双梯度钻井系统，其特征在于：所述隔水管的顶部安装有分流器，所述固控系统的底部引出有旁通管线与所述分流器连接；所述旁通管线和所述返回管线上均安装有所述节流控制系统，所述返回管线和所述注入管线上分别设置有流量表和压力表，各所述压力表和各所述流量表均与所述数据监控系统信号连接；所述隔水管的底部连接有防喷器组，所述防喷器组位于井口处，钻井内安装有套管，所述套管顶部与所述防喷器组连接，所述套管与所述连续外管之间的环空内填充有隔离液，所述隔离液位于泥线处，用于分隔上部海水和下方的钻井液。
  7. 根据权利要求4所述的双层连续管双梯度钻井系统，其特征在于：所述转换接头包括壳体和安装于所述壳体内的双层转换套管，所述双层转换套管的一端通过管连接器与所述双层连续管的内、外管连接，另一端通过管连接器与所述返回管线和所述注入管线连接。
  8. 根据权利要求1所述的双层连续管双梯度钻井系统，其特征在于：所述第二测试短节与所述动力钻具之间还设置有回收短节，所述双层连续管、所述第一测试短节、所述井下举升泵系统、所述第二测试短节和所述回收短节以及所述动力钻具依次通过双层连续管转接头连接。
  9. 根据权利要求1所述的双层连续管双梯度钻井系统，其特征在于：所 述驱动部件为液力马达或电机，且当所述举升泵通过电机提供动力时，所述电机的电力通过电缆或有绝缘层的所述双层连续管供给。
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