CN208294471U - It is a kind of for deep water without marine riser gas lift reverse circulation drilling well system - Google Patents

It is a kind of for deep water without marine riser gas lift reverse circulation drilling well system Download PDF

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Publication number
CN208294471U
CN208294471U CN201820762112.4U CN201820762112U CN208294471U CN 208294471 U CN208294471 U CN 208294471U CN 201820762112 U CN201820762112 U CN 201820762112U CN 208294471 U CN208294471 U CN 208294471U
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wall
gas
water
mud
air
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CN201820762112.4U
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叶建良
秦绪文
邱海峻
张伟
谢文卫
王偲
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Guangzhou Marine Geological Survey
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Guangzhou Marine Geological Survey
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Abstract

The utility model relates to a kind of for deep water without marine riser gas lift reverse circulation drilling well system, including slurry injection system and gaslift reverse cycle coring drilling system;The slurry injection system includes sequentially connected returning to cone, flow in pipes, mud injection pump and slurry tank;The gas lift reverse circulation core-drilling system includes air compressor, air water faucet, double-wall drill pipe, gas-water mixer and single wall drilling rod, air compressor is connect with air water faucet, air water faucet lower end is connect with double-wall drill pipe, the lower end of double-wall drill pipe is separately connected with gas-water mixer, the lower end of gas-water mixer is connect with single wall drilling rod, and the cone that returns to is arranged on the outer wall of drilling rod connection.The utility model is not necessarily to water proof measure, realizes mud circulation and the protection borehole wall in drilling, can be applied to any depth of water;Rock core and landwaste are conveyed using gas lift reverse circulation principle, reduce construction time and cost;Reduce the requirement to mud injection pump, good reliability.

Description

It is a kind of for deep water without marine riser gas lift reverse circulation drilling well system
Technical field
The utility model relates to oil gas drilling technical field, it is specifically a kind of for deep water without marine riser gas lift reverse circulation Well system.
Background technique
Nowadays, be related to oil-gas exploration the depth of water be it is deeper and deeper, drilling depth is even more than several kms, conventional ocean In deepwater drilling, the closed circuit drilling well of marine riser direct circulation or the method without marine riser direct circulation open circuit drilling well are generallyd use, it is above The existing equal Shortcomings of well system: 1) mating complicated, complicated for operation using marine riser well system, load acts on well Mouth soft formation influences well head stability, and causes mud when holding mud (also known as drilling fluid) closed cycle in conventional marine riser Slurry circulation pressure drop increases, and causes greatly to restrict to the construction of narrow space Density Window, to closed circuit drilling well-head sealing requirements It is very strict, and the emergency release program for meeting emergency case is complicated, and risk is high;2) it is turned round, is opened using conventional open circuit direct circulation Road drilling mud is flow to from drill bit from ship by drilling rod, flows out to the annular space between drilling rod and the borehole wall by hydrophthalmia, and annular space is without closing Circulation, mud are directly discharged in seawater from well head, and not only mud consumption is very big, and mud is at high cost, and drilling fluid is direct Row sea pollutes environment;If it is counterflush drilling system, the common pump pressure reacting cycle of existing method needs powerful injection Mud is continuously injected into annular space by pumping system, then enters drilling rod up to returning from drill bit by Transport of Drilling Cutting In A Out, this will propose that very high requirement needs to flow through the depth of water of several kms if applying to deep-sea to the ability of injection pump, this The power cutting carring that the injection pump of sample provides, which flows through several kms and returns out, seems extremely difficult, and cost and risk is higher;3) borehole wall It is easy to be impacted by mud especially at well head, stability cannot get effective guarantee, and mud speed rate is insufficient, cause in drilling Landwaste carrying effect is poor, easily causes bit freezing, rock core is easy chip off-falling, and the quality of core sample is difficult to ensure;4) gas lift reverse circulation skill Art is usually applied to Hydrology geology well, well is often used, but these well depths only have several hundred rice, and deep-marine-environment Under, need to overcome the on-way resistance of several kms, conventional configuration is difficult to meet deep-sea requirement.
Utility model content
In view of the deficiencies of the prior art, the utility model provide it is a kind of based on circulating fluid without the quick coring of marine riser Well system is able to solve the problem of drilling well hardly possible under deepwater environment, the problem for especially requiring injection pump energy high.
The technical solution of the utility model are as follows: it is a kind of for deep water without marine riser gas lift reverse circulation drilling well system, it is special Sign is: including slurry injection system and gaslift reverse cycle coring drilling system;The slurry injection system includes being sequentially connected Return to cone, flow in pipes, mud injection pump and slurry tank;The gas lift reverse circulation core-drilling system includes air compression Machine, air water faucet, double-wall drill pipe gas-water mixer and single wall drilling rod, air compressor are connect with the upper end of air water faucet, double-walled The lower end of the gentle tap in the upper end of drilling rod connects, and the lower end of double-wall drill pipe is connected with the upper end of gas-water mixer, mixing wastewater with air The lower end of device is connect with single wall drilling rod, and the single wall drilling rod is connect with core bit, and single wall drilling rod is passed through from the lumen for returning to cone, It returns between the inner wall of cone and the outer wall of single wall drilling rod and forms annular region;Connection, top are driven in the upper end and top of the air water faucet It drives and is connect by pipeline with sampler, sampler is used to store the core sample obtained;Air compressor is bored by double-walled Gas access is formed between bar outer tube and gas-water mixer, and mud circulation passage is formed between mud injection pump and gas-water mixer, Gas-water mixer forms access by double-wall drill pipe inner tube and sampler.
Further, the flow in pipes is equipped with flow control valve, for controlling the mud pressure of process in flow in pipes Power and flow.
Further, the cone that returns to is equipped with preventer.
Further, it is equipped with air inlet non-return valve between the air compressor and air water faucet, for preventing compressed air Reverse flow.
Further, it is described top drive by top drive on interface connect with pipeline, pipeline is connect with sampler, push up drive and The junction of interface is equipped with the blowout joint for preventing mud from spraying.
The utility model has the following beneficial effects:
(1) special water proof measure is not necessarily to, it can be achieved that mud recycles and protects the borehole wall in drilling, and can be applied to any water It is deep, even if the depth of water is more than several kms, also still can be used normally;
(2) rock core and landwaste are continuously conveyed using gas lift reverse circulation principle and then realization, drilling construction will not be because of coring Operation and interrupt, construction non-cutting time is short, ultrahigh in efficiency, therefore significantly reduces construction time and cost;Creep into the rock core generated With rig floor is returned in landwaste whole, the product that imitate with not will cause missing;
(3) deep water slurry injection system can accurately control the pressure and flow of injection mud, and construction risk is low, air water The density contrast for mixing generation is about to mud certainly and is taken out of, and the Capability Requirement to mud injection pump is reduced, anti-compared to conventional pump pressure Circulation, save the cost, good reliability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model;
In figure, 1- is driven on top, 2- air water faucet, 3- blowout joint control cable, 4- slurry tank, 5- mud injection pump, 6- flow Control valve, 7- preventer control cable, 8- core bit, 9- single wall drilling rod, 10- preventer, 11- return to cone, 12- mixing wastewater with air Device, 13- double-wall drill pipe, 14- air compressor, 15- sampler, 16- air inlet non-return valve, 17- blowout joint, 18- double-walled bore Bar inner tube, 19- flow in pipes, 20- double-wall drill pipe outer tube.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model:
As shown in Figure 1, it is a kind of for deep water without marine riser gas lift reverse circulation drilling well system, including slurry injection system and Gas lift reverse circulation core-drilling system;The slurry injection system include it is sequentially connected return to cone 11, flow in pipes 19 and Mud injection pump 5 and slurry tank 4 on the drilling ship of sea, the mud being stored in slurry tank 4 are inhaled by mud injection pump 5 After entering, it is fed through and is returned in cone 11 along flow in pipes 19;The gas lift reverse circulation core-drilling system includes air compressor 14, air water faucet 2, double-wall drill pipe 13, double-wall drill pipe inner tube 18, gas-water mixer 12, single wall drilling rod 9 and core bit 8, air Compressor 14 is connect with the mountain loneliness of air water faucet 2 by pipeline and compressed air is fed through in air water faucet 2, and double-walled bores Bar 13 includes double-wall drill pipe inner tube 20 and double-wall drill pipe inner tube 18, the upper end of double-wall drill pipe 13 lower end with air water faucet 2 respectively Connection, air water faucet 2 is mutually indepedent with the communicating passage of double-wall drill pipe inner tube 20 and double-wall drill pipe inner tube 18, double-wall drill pipe 13 Lower end and the upper end of gas-water mixer 12 are separately connected, gas-water mixer 12 and double-wall drill pipe inner tube 20 and double-wall drill pipe inner tube 18 communicating passage is mutually indepedent, and the lower end of gas-water mixer 12 is connect with single wall drilling rod 9, the single wall drilling rod 9 and column drill First 8 connection, single wall drilling rod 9 are passed through from the lumen for returning to cone 11, return to shape between the inner wall of cone 11 and the outer wall of single wall drilling rod 9 At annular region;The upper end of the air water faucet 2 is driven 1 with top and is connect, and top is driven 1 by pipeline and is arranged on the drill ship of sea Sampler 15 connects, and sampler 15 is used to store the core sample obtained.
In the present embodiment, mud injection pump 5 is equipped with flow control valve 6 with the flow in pipes 19 that cone 11 is connect is returned to, For controlling the mud pressure and flow of process in flow in pipes 19;It returns to cone 11 and is equipped with preventer 10, preventer 10 passes through Preventer control cable 7 is connect with sea drill ship, so as to control preventer 10, preventer 10 can be set to it is multiple, it is excellent It is selected as two;Air inlet non-return valve 16 is equipped between air compressor 14 and air water faucet 2, air inlet non-return valve 16 is arranged in pipeline On, for preventing compressed air out of air water leading 2 reverse flows to air compressor 14;1 is driven by the interface in top drive 1 in top It is connect with pipeline, pipeline is connect with sampler 15 again, and top drive 1 and the junction of interface are equipped with blowout joint 17, for preventing Mud sprays, and blowout joint 17 controls cable 3 by blowout joint 17 and connect with sea drill ship, so as to control blowout joint The operations such as 17 rotations.
When specifically used, the mud being stored in slurry tank 4 is fed through in flow in pipes 19 by mud injection pump 5, warp After overcurrent control valve 6 controls pressure and the flow of mud, mud, which is fed through, to be returned in cone 11, and flowing downward to enter is located at Single wall drilling rod 9 in well and the annular region between cone 11 is returned to, core bit 8 can also mix during drilling well obtains rock core Entering some landwaste, landwaste and rock core, which are mixed into, to be flowed up into mud together to the lumen channel of single wall drilling rod 9, until Into in gas-water mixer 12;On the other hand, compressed air is sent into double-wall drill pipe 13 by air water faucet 2 by air compressor 14 Lumen channel in, compressed air, which flows downward, to be entered to gas-water mixer 12 and mutually mixes with the mud in gas-water mixer 12 It closes;Compressed air enters in double-wall drill pipe 13 via after gas-water mixer 12, is mixed to form with mud more lower than mud density Gas-liquid mixing liquid makes the fluid density inside and outside the pipe of double-wall drill pipe 13 produce difference, so inside and outside the pipe of double-wall drill pipe it Between form pressure difference, so that gas lift reverse circulation, reduces the Capability Requirement to mud injection pump 5, can to transport in lower power Mud injection pump 5 under row, mud and rock core can also be fed through in sampler 15, counter compared to traditional pump pressure to follow Ring more save the cost, reliability are higher;Under such differential pressure action, the mud that driving is located at lower part in pipe lifts upwards, makes The inner cavity that the mud in the outer annular region of the single wall drilling rod 9 in well enters single wall drilling rod 9 is obtained, and is passed through to gas-water mixer Enter in double-wall drill pipe inner tube 18 after 12, the mud for being mixed with compressed air drives 1 upwards along inner tube 18, air water faucet 2 and top Flowing, eventually enters into sampler 15, sampler 15 separates landwaste and core sample, by the mud after separating treatment It is re-injected into slurry tank 4, forms recycling for mud, and then realize the constantly continuous drilling of circulation and coring.
Air compressor, which passes through, forms gas access between double-wall drill pipe and gas-water mixer, correspond to three shown in Fig. 1 Arrow indicates the direction of air flowing, and mud circulation passage is formed between mud injection pump and gas-water mixer, corresponds to Fig. 1 Shown in single arrow, indicate the direction of mud, gas-water mixer forms access by double-wall drill pipe inner tube and sampler, right It should indicate to be mixed into the mud flow direction after air in double-head arrow shown in Fig. 1.
For those skilled in the art, it can make other each according to the above description of the technical scheme and ideas Kind is corresponding to be changed and deforms, and all these change and deform the guarantor that all should belong to the utility model claims Within the scope of shield.

Claims (5)

1. it is a kind of for deep water without marine riser gas lift reverse circulation drilling well system, it is characterised in that: including slurry injection system and Gas lift reverse circulation core-drilling system;The slurry injection system includes that sequentially connected cone, flow in pipes, the mud of returning to injects Pump and slurry tank;The gas lift reverse circulation core-drilling system includes air compressor, air water faucet, double-wall drill pipe mixing wastewater with air Device and single wall drilling rod, air compressor are connect with the upper end of air water faucet, and the lower end of the gentle tap in the upper end of double-wall drill pipe connects It connects, the lower end of double-wall drill pipe is connected with the upper end of gas-water mixer, and the lower end of gas-water mixer is connect with single wall drilling rod, the list Wall drilling rod is connect with core bit, and single wall drilling rod is passed through from the lumen for returning to cone, returns to the inner wall of cone and the outer wall of single wall drilling rod Between form annular region;Connection is driven in the upper end and top of the air water faucet, and top, which is driven, to be connect by pipeline with sampler, samples Device is used to store the core sample obtained;It is logical that air compressor passes through formation gas between double-wall drill pipe outer tube and gas-water mixer Road, forms mud circulation passage between mud injection pump and gas-water mixer, gas-water mixer passes through double-wall drill pipe inner tube and takes Sampling device forms access.
2. it is according to claim 1 for deep water without marine riser gas lift reverse circulation drilling well system, it is characterised in that: it is described Flow in pipes is equipped with flow control valve, for controlling the mud pressure and flow of process in flow in pipes.
3. it is according to claim 1 for deep water without marine riser gas lift reverse circulation drilling well system, it is characterised in that: it is described It returns to cone and is equipped with preventer.
4. it is according to claim 1 for deep water without marine riser gas lift reverse circulation drilling well system, it is characterised in that: it is described It is equipped with air inlet non-return valve between air compressor and air water faucet, for preventing compressed air reverse flow.
5. it is according to claim 1 for deep water without marine riser gas lift reverse circulation drilling well system, it is characterised in that: it is described Top, which is driven, to be connect by the interface that top is driven with pipeline, and pipeline is connect with sampler, and top is driven to be equipped with the junction of interface and is used for The blowout joint for preventing mud from spraying.
CN201820762112.4U 2018-05-21 2018-05-21 It is a kind of for deep water without marine riser gas lift reverse circulation drilling well system Active CN208294471U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112627753B (en) * 2020-12-23 2022-05-31 中煤水文局集团有限公司 Method for maintaining mud circulation in lost-return stratum

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112627753B (en) * 2020-12-23 2022-05-31 中煤水文局集团有限公司 Method for maintaining mud circulation in lost-return stratum

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