CN107461162A - A kind of gas lift reverse circulation drilling well method and BHA device - Google Patents

A kind of gas lift reverse circulation drilling well method and BHA device Download PDF

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Publication number
CN107461162A
CN107461162A CN201710549805.5A CN201710549805A CN107461162A CN 107461162 A CN107461162 A CN 107461162A CN 201710549805 A CN201710549805 A CN 201710549805A CN 107461162 A CN107461162 A CN 107461162A
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drill string
drilling
pipe
drill
annular space
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CN201710549805.5A
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CN107461162B (en
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杨帆
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CHENGDU SOUTHWEST PETROLEUM UNIVERSITY PETROLEUM ENGINEERING TECHNOLOGY Co Ltd
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CHENGDU SOUTHWEST PETROLEUM UNIVERSITY PETROLEUM ENGINEERING TECHNOLOGY Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

The invention belongs to gaslift drilling technology field, and in particular to a kind of gas lift reverse circulation drilling well method and BHA device, the above method includes A, injects gases at high pressure into drill string inner chamber by kelly bar;B, gases at high pressure form gas-liquid mixture fluid through double-wall drill pipe and drilling fluid;C, the annular space that gas-liquid mixture fluid is entered between drill string and the borehole wall by bypass short joint;D, separated under gravity into the gas in annular space and drilling fluid, drilling fluid, which is then migrated to shaft bottom and carries shaft bottom landwaste, enters drill string inner chamber;E, landwaste is deposited in desilting pipe, and drilling fluid is again introduced into the annular space between drill string and the borehole wall, forms interior circulation of the drilling fluid by annular space between drill string inner chamber drill string and the borehole wall;F, with the drilling of drill bit, repeat step B to E.Gas lift reverse circulation drilling well method provided by the invention and BHA device, in the case where not reducing drilling fluid density and not increasing shaft bottom back pressure, so that it may realize the safety drilling in low-pressure stratum.

Description

A kind of gas lift reverse circulation drilling well method and BHA device
Technical field
The present invention relates to a kind of gas lift reverse circulation drilling well method and BHA device, belongs to gaslift drilling technology field.
Background technology
In the oil/gas drilling operation of routine, drilling fluid enters drill string inner chamber from drill with ferrule head tap, is sprayed from bit port Go out, after the cutting carring of shaft bottom, ground, referred to as direct circulation drilling well are returned out by the annular circulation between drill string and the borehole wall.Drilling well Liquid is injected from above-mentioned annular space, and after flowing through drill bit cutting carring, ground, referred to as counterflush drilling are returned out by drill string endoporus.Pass through Circulation of drilling fluid, which takes landwaste out of pit shaft, prevents that bit freezing from being one of major function of drilling fluid, and it is spudder to establish circulation of drilling fluid Journey is able to the premise being normally carried out.Head of liquid of the drilling fluid in pit shaft not higher than strata pressure be establish circulation of drilling fluid and The basis do not missed largely.But when boring chance pole low-pressure stratum, it is difficult to be followed with drilling fluid density method is reduced to establish drilling fluid Ring, landwaste can not recycle pit shaft, lock of tool drilling often occurs, and carry out extreme difficulties to drilling engineering band.
In order to establish circulation of drilling fluid in low-pressure stratum and reduce leakage, many known reduction drilling fluid densities are generated Method, but circulation of drilling fluid cannot be established in the well on the extremely low stratum of some pressure, so as to which drilling well work can not be implemented.
The content of the invention
The invention provides a kind of gas lift reverse circulation drilling well method and BHA device, it is intended that solving existing Above mentioned problem present in technology.
Technical scheme is as follows:
The invention provides a kind of gas lift reverse circulation drilling well method, comprise the following steps:
A, when boring chance low-pressure stratum, continue to inject gases at high pressure into drill string inner chamber by kelly bar;
B, gases at high pressure enter another passage along the passage of double-wall drill pipe one, then form gas-liquid mixture fluid with drilling fluid;
C, the annular space that gas-liquid mixture fluid is entered between drill string and the borehole wall by the by-pass prot on bypass short joint;
D, separated under gravity into the gas in annular space and drilling fluid, wherein gas along drill string and the borehole wall it Between annular space migrate to well head and discharged through blow-down pipe, and drilling fluid is then migrated to shaft bottom and carries shaft bottom landwaste through drill bit water Eye is again introduced into drill string inner chamber;
E, the landwaste in drill string inner chamber and drilling fluid are separated in desilting pipe, and landwaste is deposited in desilting pipe, drilling well Liquid through bypass short joint is again introduced into annular space between drill string and the borehole wall after then being mixed upwards with gases at high pressure, so as at nearly shaft bottom Form interior circulating system of the drilling fluid by the annular space-bit port-drill string inner chamber of drill string inner chamber-between drill string and the borehole wall;
F, with the drilling of drill bit, repeat step B to E.
In the present invention, above-mentioned steps F includes two kinds of situations:
1), when filling landwaste in desilting pipe and do not drill low-pressure stratum, stop boring, and stop injecting high pressure into kelly bar Gas, act drill string, remove desilting pipe, the landwaste precipitated in cleaning desilting pipe, then reinstalled desilting pipe, transfer drill string, Repeat step A to F, until drilling low-pressure stratum.
2), when filling or being underfilled with landwaste in desilting pipe, but drilled low-pressure stratum, stop injecting height into kelly bar Calm the anger body, and inject drilling fluid into kelly bar immediately and start the cycle over drilling fluid, treat in drill string inner chamber and annular space drilling fluid Gas all after blow-down pipe is drained, be further continued for normally being crept into, and the landwaste in desilting pipe can wait next time pull out of hole when again Cleared up.
Present invention also offers a kind of gas lift reverse circulation drilling tool combination unit, including drill string and wellhead blowout preventer, well head Blowout hookup is set on drill string.
Drill string includes kelly bar, the first single wall drilling rod group, bypass short joint, the double-walled being threadedly coupled successively along well head to shaft bottom Drilling rod, mixing pipe nipple, the second single wall drilling rod group, desilting pipe, the 3rd single wall drilling rod group, drill collar and drill bit.
Wellhead blowout preventer includes swivel control head and preventer, preventer one end and the threaded connection of well inner sleeve, another End and swivel control head bolt connection.
In embodiment provided by the invention, the four-way of above-mentioned preventer bottom is provided with blow-down pipe.
In embodiment provided by the invention, drilling tool check valve, drilling well check-valves are provided with above-mentioned first single wall drilling rod group For preventing borehole fluid from returning to well head along drill string inner chamber.
In embodiment provided by the invention, above-mentioned bypass short joint is provided with by-pass prot, and by-pass prot is used to connect in drill string Annular space between chamber and drill string and the borehole wall.
In embodiment provided by the invention, above-mentioned double-wall drill pipe includes inner and outer tubes, and inner tube one end extend into mixing In pipe nipple, and the inner tube stretched into mixing pipe nipple is provided with steam vent.Outer tube respectively with bypass short joint and mix short-section thread connect Connect.
In embodiment provided by the invention, above-mentioned desilting pipe includes desilting inner tube and desilting outer tube.
In embodiment provided by the invention, above-mentioned first single wall drilling rod group, the second single wall drilling rod group, the 3rd single wall drilling rod Group includes an at least single wall drilling rod.
Beneficial effects of the present invention are:The present invention on drill string by accessing " bypass short joint+double-wall drill pipe+desilting pipe " BHA device, in conjunction with counterflush drilling technology, circulation of drilling fluid finally is established in low-pressure stratum well, is realized Low-pressure stratum and the target for implementing drillng operation in the case of not changing drilling fluid density;In addition, the invention is further through to annular space It is middle to inject gases at high pressure to reduce the mode of annular space drilling well head of liquid, avoid annular space drilling well head of liquid and be more than formation fracture Pressure or formation collapsed pressure and caused by leakage or cave-in phenomenon, ensure that and implement drillng operation in low-pressure stratum Security.
Brief description of the drawings
, below will be to required use in embodiment in order to illustrate more clearly of the technical scheme of embodiment of the present invention Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not to be seen as It is the restriction to scope, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root Other related accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 gas lift reverse circulation drilling tool combination unit structure charts provided by the invention.
Shown in figure:20- gas lift reverse circulations drilling tool combines the unit;1- kelly bars;2- swivel control heads;3- preventers;4- Blow-down pipe;5- the first single wall drilling rod groups;6- drilling tool check valves;7- bypass short joints;70- by-pass prots;8- double-wall drill pipes;Outside 80- Pipe;82- inner tubes;84- steam vents;9 mixing pipe nipples;10- desilting pipes;100- desilting pipe outer tubes;102- desilting pipe inner tubes;11- is bored Very;12- drill bits;13- the second single wall drilling rod groups;The single wall drilling rod groups of 14- the 3rd.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
To make the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present invention Accompanying drawing in mode, the technical scheme in embodiment of the present invention is clearly and completely described, it is clear that described reality The mode of applying is a part of embodiment of the present invention, rather than whole embodiments.Therefore, the sheet to providing in the accompanying drawings below The detailed description of the embodiment of invention is not intended to limit the scope of claimed invention, but is merely representative of the present invention Selected embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work Under the premise of all other embodiment for being obtained, belong to the scope of protection of the invention.
In the description of the invention, it is to be understood that the term of indicating position or position relationship is based on shown in accompanying drawing Orientation or position relationship, be for only for ease of the description present invention and simplify description, rather than instruction or imply signified equipment Or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
Embodiment:
As shown in figure 1, present embodiments providing a kind of gas lift reverse circulation drilling well method, comprise the following steps that:
A, when boring chance low-pressure stratum, continue to inject gases at high pressure into drill string inner chamber by kelly bar 1;
B, gases at high pressure enter another passage along the passage of double-wall drill pipe 8 one, then form gas-liquid mixture fluid with drilling fluid;
C, the annular space that gas-liquid mixture fluid is entered between drill string and the borehole wall by the by-pass prot 70 on bypass short joint 7;
D, separated under gravity into the gas in annular space and drilling fluid, wherein gas along drill string and the borehole wall it Between annular space migrate to well head and discharged through blow-down pipe 4, and drilling fluid is then migrated to shaft bottom and carries shaft bottom landwaste through drill bit 12 hydrophthalmias are again introduced into drill string inner chamber;
E, the landwaste in drill string inner chamber and drilling fluid are separated in desilting pipe 10, and landwaste is deposited in desilting pipe 10, Drilling fluid then continues up and is again introduced into drill string and the borehole wall through the by-pass prot 70 on bypass short joint 7 after flowing mixes with gases at high pressure Between annular space, so as to form drilling fluid at nearly shaft bottom by the water of annular space-drill bit 12 of drill string inner chamber-between drill string and the borehole wall The interior circulating system of eye-drill string inner chamber;
F, with the drilling of drill bit, repeat step B to E.
In the present embodiment, above-mentioned steps B mesohighs gas can both enter in double-wall drill pipe 8 along the inner chamber of double-wall drill pipe 8 Annular space between pipe 80 and outer tube 82, double-wall drill pipe 8 can also be entered along the annular space between the inner tube 80 of double-wall drill pipe 8 and outer tube 82 Inner chamber, then form gas-liquid mixture fluid in pipe nipple 9 is mixed with drilling fluid.
In the present embodiment, above-mentioned steps F includes two kinds of situations:
1), when filling landwaste in desilting pipe 10 and do not drill low-pressure stratum, stop boring, and stop injecting into kelly bar 1 Gases at high pressure, act drill string, remove desilting pipe 10, the landwaste precipitated in cleaning desilting pipe 10, then reinstall desilting pipe 10, Transfer drill string, repeat step A to F, until drilling low-pressure stratum.
2), when filling or being underfilled with landwaste in desilting pipe 10, but drilled low-pressure stratum, stop noting into kelly bar 1 Enter gases at high pressure, and inject drilling fluid into kelly bar 1 immediately and start the cycle over drilling fluid, treat drill string inner chamber and annular space drilling well Gas in liquid is further continued for normally being crept into all after blow-down pipe 4 is drained, and the landwaste in desilting pipe 10 can wait rise next time Cleared up again during brill.
As shown in figure 1, the present embodiment additionally provides a kind of gas lift reverse circulation drilling tool combination unit 20, including drill string and well head Blowout hookup, wellhead blowout preventer are set on drill string.
Drill string include be threadedly coupled successively along well head to shaft bottom kelly bar 1, the first single wall drilling rod group 5, bypass short joint 7, Double-wall drill pipe 8, mixing pipe nipple 9, the second single wall drilling rod group 13, desilting pipe 10, the 3rd single wall drilling rod group 14, drill collar 11 and drill bit 12。
Wellhead blowout preventer includes swivel control head 2 and preventer 3, the one end of preventer 3 and the threaded connection of well inner sleeve, separately One end and the bolt connection of swivel control head 2.
In embodiment provided by the invention, the bottom four-way of above-mentioned preventer 3 is provided with blow-down pipe 4.
In embodiment provided by the invention, drilling tool check valve 6, drilling tool non-return are provided with above-mentioned first single wall drilling rod group 5 Valve 6 is used to prevent borehole fluid from returning to well head along drill string inner chamber and blowout occurs.
In embodiment provided by the invention, above-mentioned bypass short joint 7 is provided with by-pass prot 70, and by-pass prot 70, which is used to connect, bores Annular space between post inner chamber and drill string and the borehole wall.
In embodiment provided by the invention, above-mentioned double-wall drill pipe 8 includes inner tube 80 and outer tube 82, and the one end of inner tube 80 is stretched into Into mixing pipe nipple 9, and the inner tube 80 stretched into mixing pipe nipple 9 is provided with steam vent 84.The one end of outer tube 82 and the spiral shell of bypass short joint 7 Line is connected, and the other end and mixing pipe nipple 9 are threadedly coupled.
Specifically, above-mentioned steam vent 84 is logical between the inner chamber of double-wall drill pipe 8 and the inner tube 80 and outer tube 82 of double-wall drill pipe 8 Road.
In embodiment provided by the invention, above-mentioned desilting pipe 10 includes desilting inner tube 100 and desilting outer tube 102, desilting Cavity between inner tube 100 and desilting outer tube 102 is used to depositing and storing landwaste.
In embodiment provided by the invention, above-mentioned first single wall drilling rod group 5, the second single wall drilling rod group 13, the 3rd single wall Drilling rod group 14 includes an at least single wall drilling rod.
Furthermore, it is to be understood that can be not provided with above-mentioned mixing pipe nipple 9 in the present invention, gases at high pressure also may be used with drilling fluid Gas-liquid mixing process is completed in double-wall drill pipe 8.
Gas lift reverse circulation drilling well method provided by the invention and BHA device have the beneficial effect that:The present invention by The BHA device of " bypass short joint+double-wall drill pipe+desilting pipe " is accessed on drill string, in conjunction with counterflush drilling technology, finally Circulation of drilling fluid is established in low-pressure stratum well, realizes in low-pressure stratum and implements in the case of not changing drilling fluid density The target of drillng operation;In addition, the invention reduces annular space drilling well head of liquid further through gases at high pressure are injected into annular space Mode, avoid annular space drilling well head of liquid more than formation fracture pressure or formation collapsed pressure and caused by leakage or the borehole wall collapse Collapse phenomenon, ensure that the security for implementing drillng operation in low-pressure stratum.
It is described above, any formal limitation not is made to the present invention, although the present invention is disclosed such as by embodiment On, but the present invention is not limited to, any person skilled in the art, do not departing from technical solution of the present invention scope It is interior, when the technology contents using the disclosure above make a little change or are modified to the equivalent embodiments of equivalent variations, as long as being Without departing from the content of technical solution of the present invention, what the technical spirit according to the present invention was made to above example any simply repaiies Change, equivalent variations and modification, in the range of still falling within technical solution of the present invention.

Claims (8)

  1. A kind of 1. gas lift reverse circulation drilling well method, it is characterised in that comprise the following steps:
    A, when boring chance low-pressure stratum, continue to inject gases at high pressure into drill string inner chamber by kelly bar;
    B, gases at high pressure enter another passage along the passage of double-wall drill pipe one, then form gas-liquid mixture fluid with drilling fluid;
    C, the annular space that gas-liquid mixture fluid is entered between drill string and the borehole wall by the by-pass prot on bypass short joint;
    D, separated under gravity into the gas in annular space and drilling fluid, wherein gas is along between drill string and the borehole wall Annular space is migrated to well head and discharged through blow-down pipe, and drilling fluid is then migrated to shaft bottom and carries shaft bottom landwaste through bit port again It is secondary to enter drill string inner chamber;
    E, the landwaste in drill string inner chamber and drilling fluid are separated in desilting pipe, and landwaste is deposited in desilting pipe, and drilling fluid is then Continue up and be again introduced into the annular space between drill string and the borehole wall through bypass short joint after flowing mixes with gases at high pressure, so as in nearly well Bottom forms interior circulating system of the drilling fluid by the annular space-bit port-drill string inner chamber of drill string inner chamber-between drill string and the borehole wall;
    F, with the drilling of drill bit, repeat step B to E.
  2. 2. a kind of gas lift reverse circulation drilling tool combination unit, it is characterised in that including drill string and wellhead blowout preventer, blowout preventer dress Put and be set on drill string;
    Drill string includes kelly bar, the first single wall drilling rod group, bypass short joint, the double-walled brill being threadedly coupled successively along well head to shaft bottom Bar, mixing pipe nipple, the second single wall drilling rod group, desilting pipe, the 3rd single wall drilling rod group, drill collar and drill bit;
    Wellhead blowout preventer includes swivel control head and preventer, preventer and swivel control head bolt connection.
  3. 3. gas lift reverse circulation drilling tool combination unit according to claim 2, it is characterised in that preventer bottom four-way It is provided with blow-down pipe.
  4. 4. gas lift reverse circulation drilling tool combination unit according to claim 3, it is characterised in that the first single wall drilling rod group In be provided with drilling tool check valve, the drilling well check-valves is used to prevent borehole fluid from returning to well head along drill string inner chamber.
  5. 5. gas lift reverse circulation drilling tool combination unit according to claim 4, it is characterised in that the bypass short joint is provided with By-pass prot, the by-pass prot are used to connect the annular space between drill string inner chamber and drill string and the borehole wall.
  6. 6. gas lift reverse circulation drilling tool combination unit according to claim 5, it is characterised in that the double-wall drill pipe includes interior Pipe and outer tube.
  7. 7. gas lift reverse circulation drilling tool combination unit according to claim 6, it is characterised in that the desilting pipe includes desilting Inner tube and desilting outer tube.
  8. 8. gas lift reverse circulation drilling tool combination unit according to claim 2, it is characterised in that the first single wall drilling rod Group, the second single wall drilling rod group, the 3rd single wall drilling rod group include an at least single wall drilling rod.
CN201710549805.5A 2017-07-07 2017-07-07 Gas-lift reverse circulation well drilling method and drilling tool combination device Active CN107461162B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109899012A (en) * 2019-01-29 2019-06-18 重庆市涪陵页岩气环保研发与技术服务中心 A kind of multistage pressure gradient gas lift reverse circulation drilling well anti-leaking method
CN110608005A (en) * 2019-10-10 2019-12-24 西南石油大学 Gas-lift reverse circulation drilling system and automatic control method
CN113340655A (en) * 2021-07-09 2021-09-03 中电建路桥集团有限公司 Exploration hole sampling device and control method
CN113748257A (en) * 2019-02-26 2021-12-03 诺瓦美拉公司 Method and system for mining

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Publication number Priority date Publication date Assignee Title
CN109899012A (en) * 2019-01-29 2019-06-18 重庆市涪陵页岩气环保研发与技术服务中心 A kind of multistage pressure gradient gas lift reverse circulation drilling well anti-leaking method
CN113748257A (en) * 2019-02-26 2021-12-03 诺瓦美拉公司 Method and system for mining
CN110608005A (en) * 2019-10-10 2019-12-24 西南石油大学 Gas-lift reverse circulation drilling system and automatic control method
CN113340655A (en) * 2021-07-09 2021-09-03 中电建路桥集团有限公司 Exploration hole sampling device and control method

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