CN105178859A - Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling - Google Patents

Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling Download PDF

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Publication number
CN105178859A
CN105178859A CN201510652785.5A CN201510652785A CN105178859A CN 105178859 A CN105178859 A CN 105178859A CN 201510652785 A CN201510652785 A CN 201510652785A CN 105178859 A CN105178859 A CN 105178859A
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gas
drilling
double
reacting cycle
pressure
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CN105178859B (en
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范黎明
邓虎
王虎
先羿
蒋杰
张国良
李金和
黄述春
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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CNPC Chuanqing Drilling Engineering Co Ltd
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Abstract

The invention discloses a full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling comprises a ground manifold connecting structure and a drilling assembly structure connected with the ground manifold connecting structure; and the ground manifold connecting structure comprises a gas injection unit, a pressure relief unit, a flowmeter, a ground gas injection manifold, a high-pressure gas injection hose, an erosion-resistant gooseneck, a high-pressure reverse circulation sand discharging hose, a ground reverse circulation sand discharging pipeline and a normal circulation gas drilling sand discharging pipeline. Double-wall drilling rigs are used in a full well section, conventional tools such as single-wall drilling rigs and gas and water mixing joints are omitted, air serves as a circulatory medium in the full well section, and reverse circulation can be implemented without mud or other drilling fluid. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling is particularly suitable for well sections with serious water shortage, serious well leakage or incapability of implementing air lift reverse circulation drilling.

Description

A kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling
Technical field
The present invention relates to oil and gas well drilling technical field, exactly relate to a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling.
Background technology
Air drilling significantly can improve the rate of penetration of the bad grounds such as lava, layer of gravel, clastic, carbonate rock, and the area application such as in Chongqing of Sichuan, average drilling speed improves 4 ~ 15 times.But when adopting direct circulation gas drilling (particularly major diameter well), equipment investment is large, occupation of land is many, air consumption is large, operation energy consumption is high, cost is high, as " well (500m) the gas drilling institute air demand 500m 26 3/ more than min, 171/2 " well institute air demand 300m 3/ min; Poor at borehole wall stability, or when formation water production is larger, increase tolerance and carry out gas drilling and exacerbate erosion to the borehole wall, increase borehole well instability possibility; Meanwhile, the ability of process formation water output problem is poor, if side by side layer cranny development (namely leakage mistake is returned and a large amount of water outlet in stratum), then be difficult to set up normal circulation, even if employing air-filling well-drilling, also easily occurring leaks does not leak the situation of sand, is difficult to ensure downhole safety; The application that these problems align recyclegas drilling well brings many restrictions.
The boring method of existing a kind of gas lift reverse circulation, if publication number is CN101929309A, publication date is that the Chinese patent literature on December 29th, 2010 discloses a kind of gas lift reverse circulation drilling process, its processing step is: 1. first unload double-walled kelly bar and fill liquid in core pipe, then reinstall double-walled kelly bar, 2. closed the high pressure valve in scum pipe exit, start air compressor machine air feed, 3. when admission pressure rises to 5.5-6MPa, then the high pressure valve in scum pipe exit is opened rapidly.Be a kind of need not all extract all drilling tools just can solve drill bit water inlet eye blocking gas lift reverse circulation drilling process.
Adopt above-mentioned patent document to be the prior art of representative, during embody rule, the method is (as 3 ~ 5m by a small amount of 3/ min) gas mixing wastewater with air joint in well to be in drill string liquid mixing, and the drilling fluid density utilizing drill string inside and outside is poor, realizes the reverse circulating boring method of drilling fluid.Although the method is lost in saving tolerance, saving equipment use amount and leakage and returned positive effect, mud must be used to circulate.Therefore, in formation leakage serious (such as solution cavity), well in the too low or well of mud liquid level when lack of water, gas lift reverse circulation cannot be implemented.Simultaneously, owing to needing mud circulation in well, therefore rock bit or PDC drill bit can only be used, and during deep drilling, the head of liquid of mud still there is chip hold down effect to shaft bottom, so deep drilling speed-increasing effect is not remarkable, this has certain limitation in oil, natural gas creep into.In addition, gas lift reverse circulation drilling well method also must use conventional single wall drilling rod and air water hybrid juction except using double wall drill tool.
Also has a kind of reverse circular technique of reaming major diameter cluster type down-hole hammer.These class methods are that the sealing device utilizing well head to install seals bore hole annulus, and the central passage of being suppressed by gas into double wall drill tool realizes reacting cycle sediment outflow.This engineering method is mainly used in colliery industry reaming and creeps into, and formation requires higher, if stratum cranny development, then annular pressure cannot be set up, and reacting cycle forms effect and also can be affected.Meanwhile, the rock crushing tool that this engineering method uses is cluster type down-hole hammer, and the structure of this instrument is complicated slightly, and maintaining and more bit change are slightly aobvious loaded down with trivial details.
Summary of the invention
The present invention is intended to for the defect existing for above-mentioned prior art and deficiency, a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling is provided, the full well section of the present invention adopts double wall drill tool, do not need the participation of the instruments such as conventional single wall drilling tool, mixing wastewater with air joint, full well section air is as circulatory mediator, do not need the participation of mud or other drilling fluids can form reacting cycle yet, be particularly useful for serious water shortage, leakage serious or the well section of gas lift reverse circulation cannot be implemented.
The present invention realizes by adopting following technical proposals:
A kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling, the structure of downhole assembly comprising manifold of ground syndeton and be connected with manifold of ground syndeton, it is characterized in that: described manifold of ground syndeton comprises: air injection unit, pressure release unit, flow meter, ground injecting gas manifold, high-pressure gas injection flexible pipe, erosion resistance gooseneck, high pressure reacting cycle sediment outflow flexible pipe, ground reacting cycle sediment outflow pipeline and direct circulation gas drilling sediment outflow pipeline
Wherein: described air injection unit is connected by high pressure line with pressure release unit, described flow meter is installed in the outlet of pressure release unit, and flow meter upstream connects pressure release unit, and downstream connects ground injecting gas manifold, and ground injecting gas manifold is connected with high-pressure gas injection flexible pipe;
The outlet of described erosion resistance gooseneck is connected with high pressure reacting cycle sediment outflow flexible pipe, high pressure reacting cycle sediment outflow flexible pipe is connected with ground reacting cycle sediment outflow pipeline, at the middle part of ground reacting cycle sediment outflow pipeline, a four-way is installed, the left end of four-way connects ground reacting cycle sediment outflow pipeline, right-hand member connects a threeway, upper end connects slush pump, and lower end connects ground injecting gas manifold; An outlet of described threeway is connected with direct circulation gas drilling sediment outflow pipeline, and another outlet of threeway is through to grit chamber;
Described erosion resistance gooseneck, high-pressure gas injection flexible pipe and direct circulation gas drilling sediment outflow pipeline are all connected on structure of downhole assembly.
On the reacting cycle sediment outflow pipeline leading to grit chamber, sampling pipe nipple and dustfall water pipe nipple are installed.
Air injection unit provides gases at high pressure, comprises air compressor and supercharger.
The left end of four-way connects ground reacting cycle sediment outflow pipeline by valve C, right-hand member connects a threeway by valve E, upper end connects slush pump by valve D, and lower end connects ground injecting gas manifold by valve B, and ground injecting gas manifold is also provided with valve A between being connected with high-pressure gas injection flexible pipe.
Described structure of downhole assembly, comprise water tap or top is driven, cock on air distribution connector, double-walled, double-walled kelly bar, cock under double-walled, rotating blowout preventer, sleeve pipe, double-wall drill pipe, double-walled drill collar, ring check valve and gas reacting cycle rock crushing tool, wherein:
Described erosion resistance gooseneck drives with water tap or top and is connected, and high-pressure gas injection flexible pipe is connected with air distribution connector, and direct circulation gas drilling sediment outflow pipeline exports with rotating blowout preventer case side and is connected;
The lower end of described water tap is connected with air distribution connector by screw thread, and air distribution connector lower end is connected with cock on double-walled by screw thread, and double-walled connects double-walled kelly bar below cock, connects cock and double-wall drill pipe under double-walled below double-walled kelly bar; Or top is driven lower end and is directly connected double-wall drill pipe by right-hand thread;
Double-walled drill collar, ring check valve and gas reacting cycle rock crushing tool is connected successively below double-wall drill pipe;
Described sleeve pipe is positioned at below well head, and the top of well head connects rotating blowout preventer, cock under rotating blowout preventer upper end connection double-walled.
The side of described well head is provided with choke manifold.
Direct circulation gas drilling sediment outflow pipeline is exported with rotating blowout preventer case side by valve F and is connected.
Described high pressure refers to the pressure being not less than 21MPa.
Compared with prior art, the beneficial effect that reaches of the present invention is as follows:
1, adopt manifold of ground syndeton and structure of downhole assembly to combine the full well section self-priming reacting cycle gas drilling system for oil/gas drilling formed, full well section adopts double wall drill tool, does not need the participation of the instruments such as conventional single wall drilling tool, mixing wastewater with air joint; Full well section air, as circulatory mediator, does not need the participation of mud or other drilling fluids can form reacting cycle yet.Be applicable to serious water shortage, leakage serious or the well section of gas lift reverse circulation cannot be implemented; While improving drilling efficiency, save gas drilling tolerance, equipment use amount, reduce occupation area of equipment volume, save integrated cost, simultaneously for overcoming down-hole water outlet, leakage is lost to return provides a kind of new drilling technology.
2, the present invention is to whether not having particular/special requirement at annular space perfusion mud.Mud liquid level is too low in lack of water or well in formation leakage serious (such as solution cavity), well, still counterflush drilling can be realized.If perfusion mud, also has positive role to the invention process counterflush drilling in well.
3, the present invention is the air reverse circulation drilling of full well section.Namely all double wall drill tool is adopted, when creeping into, shaft bottom landwaste all drains into earth's surface from double wall drill tool center sediment outflow passage, avoid in the process that air-flow returns on cutting carring and erosion is caused to the borehole wall, be conducive to preventing the generation that in troublesome zone drilling process, borehole wall perturbation caves in.
4, double wall drill tool center sediment outflow passage flow section amasss little many compared with ring-type basal area between the borehole wall and drill string.Therefore, needed for full well section air reverse circulation drilling, compressed air volume flow is relatively little, particularly when major diameter well section is crept into, more obviously.This is conducive to reducing equipment investment, reduce place area occupied, reduce demand to power and drilling fluid, save fuel consume.
5, the drilling well of formation water output ability calibration recyclegas is processed strong.During direct circulation gas drilling, be enough to make landwaste bonding agglomerating if formation water production reaches, then gathering in annular gap in well, sedimentation, formation mud cake ring, cause effect of hole cleaning poor.As processed not in time, causing lock of tool drilling the most at last, threatening downhole safety.Full well section reacting cycle gas drilling, landwaste returns along in drilling tool central passage, and on the sediment outflow passage of center, returning air-flow speed is higher, and wellbore clearance is effective, is conducive to the generation reducing mud drum.
6, the complete self-priming reacting cycle gas drilling of well section, drilling tool is all double wall drill tool, adopt reacting cycle rock crushing tool (reacting cycle air hammer, reacting cycle rock bit, reacting cycle PDC drill bit) simultaneously, gas and landwaste can not enter annular space substantially, therefore, when cranny development stratum is crept into, can avoid and reduce severe leakage.Time particularly water layer, drop ply are simultaneous, according to direct circulation gas drilling or air-filling well-drilling, easily occur that leakage is lost and return, leak and do not leak the situation of sand, be difficult to set up normal circulation.And adopt the self-priming reacting cycle gas drilling of full well section, then can effectively address this problem.Meanwhile, the present invention the need of carrying out sealing not special requirement to annular space, even if seal annular space without well mouth sealing device, still can form reacting cycle to well head place under the help of reacting cycle rock crushing tool with self sealing action.Certainly, if implement sealing to well head, also positive role is had to the invention process counterflush drilling.
7, when occurring that down-hole is complicated, direct circulation gas drilling and conventional mud drilling well can be switched at any time.
8, low pressure or under-voltage reservoir are often damaged by conventional mud drilling well, foam drilling, pressure-air drilling well.And adopting full well section self-priming reacting cycle gas drilling system, gas and landwaste can not enter stratum, and to low pressure, low permeability reservoir is pollution-free, zero injury.Meanwhile, upper returning air-flow flow velocity is high, landwaste returns lag time short, can not be contaminated because contacting with borehole wall stratum, in time, accurately can grasp formation information, finds low pressure, low permeability reservoir.Therefore, the injury of full well section self-priming reacting cycle gas drilling system commute, low pressure, low permeability formation (some shale gas, coalbed methane reservoirs etc. also comprise some debilitating reservoir) is adopted to have more advantage than direct circulation gas drilling and conventional mud drilling well.In addition, in the long run, China has a large amount of low pressure, hyposmosis oil-gas resource, To The Methane Resources In Coalbed, and the exploration and development of these resources is that the application of full well section self-priming reacting cycle gas drilling technique provides wide space.
Accompanying drawing explanation
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is present system structural representation;
Fig. 2 is drilling well gas circulation path figure.
Mark in figure:
1. on air injection unit 2. pressure release unit 3. flow meter 4. ground injecting gas manifold 5. high-pressure gas injection flexible pipe 6. air distribution connector 7. double-walled, under cock 8. double-walled kelly bar 9. double-walled, cock 10. rotating blowout preventer 11. well head 12. sleeve pipe 13. double-wall drill pipe 14. double-walled drill collar 15. ring check valve 16. gas reacting cycle rock crushing tool 17. water tap or top are driven 18. erosion resistance gooseneck 19. high pressure reacting cycle sediment outflow flexible pipe 20. ground reacting cycle sediment outflow pipelines 21. and are sampled pipe nipple 22. dustfall water pipe nipple 23. direct circulation gas drilling sediment outflow pipeline 24. slush pump 25. choke manifold 26. grit chamber 27. gas and drain into high pressure sediment outflow flexible pipe 29. double wall drill tool outer tube 30. double wall drill tool inner and outer tubes annular gap 31. double wall drill tool Nei Guan 32. center sediment outflow passage from high-pressure gas injection flexible pipe 28. gas.
Detailed description of the invention
embodiment 1
As a better embodiment of the present invention, it structure of downhole assembly comprising manifold of ground syndeton and be connected with manifold of ground syndeton, described manifold of ground syndeton comprises: air injection unit 1, pressure release unit 2, flow meter 3, ground injecting gas manifold 4, high-pressure gas injection flexible pipe 5, erosion resistance gooseneck 18, high pressure reacting cycle sediment outflow flexible pipe 19, ground reacting cycle sediment outflow pipeline 20 and direct circulation gas drilling sediment outflow pipeline 23
Wherein: described air injection unit 1 is connected by high pressure line with pressure release unit 2, pressure release unit 2 exports installs described flow meter 3, and flow meter 3 upstream connects pressure release unit 2, and downstream connects ground injecting gas manifold 4, and ground injecting gas manifold 4 is connected with high-pressure gas injection flexible pipe 5;
The outlet of described erosion resistance gooseneck 18 is connected with high pressure reacting cycle sediment outflow flexible pipe 19, high pressure reacting cycle sediment outflow flexible pipe 19 is connected with ground reacting cycle sediment outflow pipeline 20, at the middle part of ground reacting cycle sediment outflow pipeline 20, a four-way is installed, the left end of four-way connects ground reacting cycle sediment outflow pipeline 20, right-hand member connects a threeway, upper end connects slush pump 24, and lower end connects ground injecting gas manifold 4; An outlet of described threeway is connected with direct circulation gas drilling sediment outflow pipeline 23, and another outlet of threeway is through to grit chamber;
Described erosion resistance gooseneck 18, high-pressure gas injection flexible pipe 5 and direct circulation gas drilling sediment outflow pipeline 23 are all connected on structure of downhole assembly.
In this example, the structure of downhole assembly adopted can adopt various double wall drill tools common in prior art.
embodiment 2
On the basis of above-described embodiment, on the reacting cycle sediment outflow pipeline 20 leading to grit chamber, sampling pipe nipple 21 and dustfall water pipe nipple 22 are installed.Air injection unit 1 provides gases at high pressure, comprises air compressor and supercharger.The left end of four-way connects ground reacting cycle sediment outflow pipeline 20 by valve C, right-hand member connects a threeway by valve E, upper end connects slush pump 24 by valve D, and lower end connects ground injecting gas manifold 4 by valve B, and ground injecting gas manifold 4 is also provided with valve A between being connected with high-pressure gas injection flexible pipe 5.
embodiment 3
As another better embodiment of the present invention, it structure of downhole assembly comprising manifold of ground syndeton and be connected with manifold of ground syndeton, described manifold of ground syndeton comprises: air injection unit 1, pressure release unit 2, flow meter 3, ground injecting gas manifold 4, high-pressure gas injection flexible pipe 5, erosion resistance gooseneck 18, high pressure reacting cycle sediment outflow flexible pipe 19, ground reacting cycle sediment outflow pipeline 20 and direct circulation gas drilling sediment outflow pipeline 23
Wherein: described air injection unit 1 is connected by high pressure line with pressure release unit 2, pressure release unit 2 exports installs described flow meter 3, and flow meter 3 upstream connects pressure release unit 2, and downstream connects ground injecting gas manifold 4, and ground injecting gas manifold 4 is connected with high-pressure gas injection flexible pipe 5;
The outlet of described erosion resistance gooseneck 18 is connected with high pressure reacting cycle sediment outflow flexible pipe 19, high pressure reacting cycle sediment outflow flexible pipe 19 is connected with ground reacting cycle sediment outflow pipeline 20, at the middle part of ground reacting cycle sediment outflow pipeline 20, a four-way is installed, the left end of four-way connects ground reacting cycle sediment outflow pipeline 20, right-hand member connects a threeway, upper end connects slush pump 24, and lower end connects ground injecting gas manifold 4; An outlet of described threeway is connected with direct circulation gas drilling sediment outflow pipeline 23, and another outlet of threeway is through to grit chamber;
Described erosion resistance gooseneck 18, high-pressure gas injection flexible pipe 5 and direct circulation gas drilling sediment outflow pipeline 23 are all connected on structure of downhole assembly.
Described structure of downhole assembly, comprise that water tap or top drive 17, cock 7 on air distribution connector 6, double-walled, double-walled kelly bar 8, cock 9 under double-walled, rotating blowout preventer 10, sleeve pipe 12, double-wall drill pipe 13, double-walled drill collar 14, ring check valve 15 and gas reacting cycle rock crushing tool 16, wherein:
Described erosion resistance gooseneck 18 drives 17 with water tap or top and is connected, and high-pressure gas injection flexible pipe 5 is connected with air distribution connector 6, and direct circulation gas drilling sediment outflow pipeline 23 exports with rotating blowout preventer 10 case side and is connected;
The lower end of described water tap is connected with air distribution connector 6 by screw thread, and air distribution connector 6 lower end is connected with cock on double-walled 7 by screw thread, and double-walled connects double-walled kelly bar 8 below cock 7, connects cock 9 and double-wall drill pipe 13 under double-walled below double-walled kelly bar 8; Or top is driven lower end and is directly connected double-wall drill pipe 13 by right-hand thread;
Double-walled drill collar 14, ring check valve 15 and gas reacting cycle rock crushing tool 16 is connected successively below double-wall drill pipe 13;
Described sleeve pipe 12 is positioned at below well head 11, and the top of well head 11 connects rotating blowout preventer 10, cock 9 under rotating blowout preventer 10 upper end connection double-walled.
Gas reacting cycle rock crushing tool adopts conventional reverse-circulating tool.
embodiment 4
On the basis of above-described embodiment, the side of described well head 11 is provided with choke manifold 25.Direct circulation gas drilling sediment outflow pipeline 23 is exported with rotating blowout preventer 10 case side by valve F and is connected.Described high pressure refers to the pressure being not less than 21MPa.
embodiment 5
As preferred forms of the present invention, a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling that the present invention relates to is made up of following equipment and instrument: air injection unit 1, pressure release unit 2, flow meter 3, ground injecting gas manifold 4, high-pressure gas injection flexible pipe 5, air distribution connector 6, cock 7 on double-walled, double-walled kelly bar 8, cock 9 under double-walled, double-wall drill pipe 10, double-walled drill collar 11, ring check valve 12, reacting cycle rock crushing tool (reacting cycle air hammer, reacting cycle rock bit or reacting cycle PDC drill bit) 13, double-wall drill pipe 14, wellhead assembly 15, rotating blowout preventer 16, water tap (or top is driven) 17, erosion resistance gooseneck 18, high pressure reacting cycle sediment outflow flexible pipe 19, ground reacting cycle sediment outflow pipeline 20, sampling pipe nipple 21, dustfall water pipe nipple 22, direct circulation gas drilling sediment outflow pipeline 23, to slush pump 24, to choke manifold 25, also comprise a series of valve of matching and pipe nipple simultaneously.
Air injection unit 1 is made up of air compressor machine and supercharger, and concrete how much equipment should be determined according to engineering is actual.2 air compressor machines are needed and 1 supercharger for subsequent use within usual 444.5mm well 1000m.The Compressed Gas that air injection unit 1 provides drilling well required.Air injection unit 1 is connected by high pressure line (being usually not less than 21MPa) with pressure release unit 2.Pressure release unit 2 is made up of a series of valve, silencing equipment, manometer etc., belongs to safety device, for delivery system pressure and the tolerance regulating the system that enters.Pressure release unit 2 outlet arranges flow meter 3, for being metered into intrasystem actual tolerance.Ground injecting gas manifold 4 is high pressure pipe joint (being usually not less than 21MPa), is connected to form by union by a series of high pressure hard tube line, high-pressure hose line, crossover sub etc.The part of high-pressure gas injection pipeline on derrick can adopt soft pipeline, and also can adopt hard tube line, this is determined by on-site actual situations.The high-pressure gas injection flexible pipe 5 pressure rank be connected with air distribution connector 6 is not less than 21MPa usually, and the two is connected by union.Air distribution connector 6 is double-walled construction, and its upper end and water tap (or push up drive) are connected, and lower end is connected with double-walled kelly bar (or double-wall drill pipe).The effect of air distribution connector 6 is assigned in the annular gap of the inner and outer tubes of double wall drill tool by the gases at high pressure from high-pressure gas injection flexible pipe 5.Air distribution connector 6 top connecting tap (or top is driven) 17, if connecting tap 17, then for left-hand thread connects; If connect top to drive, then for right-hand thread connects.Gooseneck above water tap (or top is driven) 17 is erosion resistance gooseneck 18, and there is buffer area at this gooseneck turning, effectively can reduce the erosion of high-velocity fluid to gooseneck, and this erosion resistance gooseneck 18 belongs to field-replaceable unit.Air distribution connector 6 bottom connects cock 7 on double-walled, and on this, cock is double-walled construction, can realize sealing to double wall drill tool annular space.On double-walled, cock 7 connects double-walled kelly bar 8 below, and double-walled kelly bar 8 is generally six rib double-walled kelly bars.Cock 9 under double-walled kelly bar 8 lower end connection double-walled.Under double-walled, cock 9 is right-hand thread, and on double-walled, cock 7 is left-hand thread.If use top to drive, then can not use cock 9 under cock 7 on double-walled, double-walled kelly bar 8 and double-walled.Entering well drilling assembly is from top to bottom: double-wall drill pipe 13, double-walled drill collar 14, ring check valve 15 and gas reacting cycle rock crushing tool 16.The outer tube of double-wall drill pipe 13, double-walled drill collar 14 is conventional drill rod, and inside adds interior pipe by innovative design.Double-wall drill pipe 13 is identical with conventional drill rod with the specification of double-walled drill collar 14.Ring check valve 15 is the interior jet-preventing tool of nearly drill bit, can effectively prevent borehole fluid from recharging and enter in the inner and outer pipe annular gap of double wall drill tool.Gas reacting cycle rock crushing tool 16 comprises reacting cycle air hammer, reacting cycle rock bit and reacting cycle PDC drill bit.Reacting cycle rock crushing tool designed by the present invention has self sealss annular space function.Under self-packing effect, gases at high pressure directly enter into center sediment outflow passage (shown in Fig. 2) after this reacting cycle rock crushing tool 16, there is certain swabbing action (namely forming self-priming) in reacting cycle rock crushing tool 16 pairs of shaft bottoms simultaneously, are formed with positive effect to reverse circulating.The wellhead assembly 11 that the present invention relates to is made up of the device such as single four-way, two four-way, rising pipe nipple, single ram type perventer, double ram type preventer, annular preventer.The specific requirement of this wellhead assembly 11 should be determined according to Drilling Design.Full well section self-priming reacting cycle gas drilling system involved in the present invention and process are to wellhead assembly 11 not special requirement.For rotating blowout preventer 10, be arranged on conventional wellhead assembly 11, on the one hand salable annular space, offer help when counterflush drilling needs sealing annular space; On the other hand, when being converted to direct circulation gas drilling, rotating blowout preventer 10 is absolutely necessary device.High pressure reacting cycle sediment outflow flexible pipe 19 is connected by union with erosion resistance gooseneck 18, and pressure rank should not lower than 35MPa, and length also should according to derrick height choose reasonable.Ground reacting cycle sediment outflow pipeline 20 pressure rank can not lower than 35MPa, and far-end and direct circulation gas drilling sediment outflow pipeline 23 on a sediment outflow passage, together pick out to grit chamber.The pressure rank of direct circulation gas drilling sediment outflow pipeline 23 is not less than 7MPa, is generally 10 " pipelines.
The implementation process of full well section self-priming reacting cycle gas drilling is as follows: close D, B, F valve, open A, C, E valve.Compressed Gas is produced by air injection unit 1, flows through pressure release unit 2, flow meter 3, ground injecting gas manifold 4, high-pressure gas injection flexible pipe 5 arrive air distribution connector 6.Under the effect of air distribution connector 6, Compressed Gas enters into the inner and outer pipe annular gap of double wall drill tool (double-walled kelly bar 8, double-wall drill pipe 13, double-walled drill collar) and descending along annular gap, by arriving gas reacting cycle rock crushing tool 16 place after ring check valve 15.Under the broken rock of gas reacting cycle rock crushing tool 16, self sealss annular space, reacting cycle sediment outflow three greatly effect, the center sediment outflow passage of Compressed Gas cutting carring pipe in double wall drill tool returns, through water tap (or top is driven) 17, erosion resistance gooseneck 18, high pressure reacting cycle sediment outflow flexible pipe 19, ground reacting cycle sediment outflow pipeline 20, sampling pipe nipple 21 and dustfall water pipe nipple 22, finally drain into grit chamber.
When down-hole occurs complicated, when needing by direct circulation gas drilling process complexity or be converted to the process implementing drilling well of direct circulation gas drilling: close A, D, E valve, open B, C, F valve.After air injection unit 1 produces gases at high pressure, gas, through pressure release unit 2 and flow meter 3, enters into ground reacting cycle sediment outflow pipeline 20 by B valve.Compressed Gas is through ground reacting cycle sediment outflow pipeline 20, high pressure reacting cycle sediment outflow flexible pipe 19, erosion resistance gooseneck 18, water tap (or top is driven) 17, directly enter into air distribution connector 6, double wall drill tool (double-walled kelly bar 8, double-wall drill pipe 13, double-walled drill collar 14, gas reacting cycle rock crushing tool 16) center sediment outflow passage in, and come downwards to shaft bottom along center sediment outflow passage, carry shaft bottom landwaste to return along on the annular space between double wall drill tool and the borehole wall, under the effect of rotating blowout preventer 10, by valve F, direct circulation ground sediment outflow pipeline 23, sampling pipe nipple 21, dustfall water pipe nipple 22, finally drain into grit chamber.
When down-hole occurs complicated, when needing by conventional mud drilling well process complexity or be converted to conventional mud drilling technology enforcement drilling well: close A, B, E, F valve, open D, C valve.From the mud (or other drilling fluid) of slush pump 24, by D valve, C valve, ground reacting cycle sediment outflow pipeline 20, high pressure reacting cycle sediment outflow flexible pipe 19, erosion resistance gooseneck 18, water tap (or top is driven) 17, directly enter into air distribution connector 6, double wall drill tool (double-walled kelly bar 8, double-wall drill pipe 13, double-walled drill collar 14, gas reacting cycle rock crushing tool 16) center sediment outflow passage in, and come downwards to shaft bottom along center sediment outflow passage, carry shaft bottom landwaste and return well head along on the annular space between double wall drill tool and the borehole wall, due to the F valve closing at rotating blowout preventer 10 place, the mud returning well head from shaft bottom will enter choke manifold 25, finally be recycled in mud circulating system.

Claims (8)

1. the full well section self-priming reacting cycle gas drilling system for oil/gas drilling, the structure of downhole assembly comprising manifold of ground syndeton and be connected with manifold of ground syndeton, it is characterized in that: described manifold of ground syndeton comprises: air injection unit (1), pressure release unit (2), flow meter (3), ground injecting gas manifold (4), high-pressure gas injection flexible pipe (5), erosion resistance gooseneck (18), high pressure reacting cycle sediment outflow flexible pipe (19), ground reacting cycle sediment outflow pipeline (20) and direct circulation gas drilling sediment outflow pipeline (23),
Wherein: described air injection unit (1) is connected by high pressure line with pressure release unit (2), described flow meter (3) is installed in pressure release unit (2) outlet, flow meter (3) upstream connects pressure release unit (2), downstream connects ground injecting gas manifold (4), and ground injecting gas manifold (4) is connected with high-pressure gas injection flexible pipe (5);
The outlet of described erosion resistance gooseneck (18) is connected with high pressure reacting cycle sediment outflow flexible pipe (19), high pressure reacting cycle sediment outflow flexible pipe (19) is connected with ground reacting cycle sediment outflow pipeline (20), at the middle part on ground reacting cycle sediment outflow pipeline (20), a four-way is installed, the left end of four-way connects ground reacting cycle sediment outflow pipeline (20), right-hand member connects a threeway, upper end connects slush pump (24), and lower end connects ground injecting gas manifold (4); An outlet of described threeway is connected with direct circulation gas drilling sediment outflow pipeline (23), and another outlet of threeway is through to grit chamber;
Described erosion resistance gooseneck (18), high-pressure gas injection flexible pipe (5) and direct circulation gas drilling sediment outflow pipeline (23) are all connected on structure of downhole assembly.
2. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 1, it is characterized in that: on the reacting cycle sediment outflow pipeline (20) leading to grit chamber, sampling pipe nipple (21) and dustfall water pipe nipple (22) are installed.
3. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 1, is characterized in that: air injection unit (1) provides gases at high pressure, comprises air compressor and supercharger.
4. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 1, it is characterized in that: the left end of four-way connects ground reacting cycle sediment outflow pipeline (20) by valve C, right-hand member connects a threeway by valve E, upper end connects slush pump (24) by valve D, lower end connects ground injecting gas manifold (4) by valve B, and ground injecting gas manifold (4) is also provided with valve A between being connected with high-pressure gas injection flexible pipe (5).
5. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 1, it is characterized in that: described structure of downhole assembly, comprise water tap or cock (9) under cock (7) on (17), air distribution connector (6), double-walled, double-walled kelly bar (8), double-walled, rotating blowout preventer (10), sleeve pipe (12), double-wall drill pipe (13), double-walled drill collar (14), ring check valve (15) and gas reacting cycle rock crushing tool (16) are driven in top, wherein:
Described erosion resistance gooseneck (18) drives (17) and is connected with water tap or top, high-pressure gas injection flexible pipe (5) is connected with air distribution connector (6), and direct circulation gas drilling sediment outflow pipeline (23) exports with rotating blowout preventer (10) case side and is connected;
The lower end of described water tap is connected with air distribution connector (6) by screw thread, air distribution connector (6) lower end is connected with cock on double-walled (7) by screw thread, cock on double-walled (7) below connects double-walled kelly bar (8), cock (9) and double-wall drill pipe (13) under double-walled kelly bar (8) below connection double-walled; Or top is driven lower end and is directly connected double-wall drill pipe (13) by right-hand thread;
Double-wall drill pipe (13) below connects double-walled drill collar (14), ring check valve (15) and gas reacting cycle rock crushing tool (16) successively;
Described sleeve pipe (12) is positioned at well head (11) below, and the top of well head (11) connects rotating blowout preventer (10), cock (9) under rotating blowout preventer (10) upper end connection double-walled.
6. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 5, is characterized in that: the side of described well head (11) is provided with choke manifold (25).
7. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 5, is characterized in that: direct circulation gas drilling sediment outflow pipeline (23) to be exported with rotating blowout preventer (10) case side by valve F and is connected.
8. a kind of full well section self-priming reacting cycle gas drilling system for oil/gas drilling according to claim 1 or 5, is characterized in that: described high pressure refers to the pressure being not less than 21MPa.
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