CN1356451A - Reverse cycle drilling method and equipment for oil well or gas well - Google Patents
Reverse cycle drilling method and equipment for oil well or gas well Download PDFInfo
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Abstract
A drilling method for oil-gas well features that an air compressor is used to fill the compressed air in the dual-layer air-filling joint and a air mixer is used to mix the high-pressure air with the drilling liquid in drilling column to decrease the density of the said drilling liquid, resulting in reverse circulation of drilling liquid. Its apparatus is additionally equipped with well spray preventer, throttle pipe, liquid outlet control valve, ring-shaped check valve and circulating pump for filling the proper drilling liquid into well. Its advantages include balancing the stratum pressure with drilling liquid pressure, and preventing well spray and leakage.
Description
The present invention considers to be worth doing in the oil drilling technology field, is that a kind of to make and utilize the inside and outside drilling fluid density of drill string poor, realizes the reverse circulating boring method of drilling fluid and realizes the corollary equipment that this method adopted.The present invention is by the gas passage of double-deck drilling tool, injecting compressed air in double-deck drilling tool, the air that injects the certain depth place enter in the drilling tool with drilling tool in drilling fluid mixed, reduce the density of drilling fluid in the drill string, make the interior drilling fluid density of drill string less than the outer drilling fluid density of drill string, the inside and outside drilling fluid of drill string forms density contrast, and drilling fluid in the drill string is given rise to ground.After drilling fluid is handled on ground, by circulation pump, the drilling fluid after handling is filled into annular space between the drill string and the borehole wall, realize the drilling fluid counterflush drilling new technology of oil gas well drilling.
At present, in oil, the natural gas well wellbore construction, what extensively adopt is the boring method of conventional direct circulation drilling fluid.This method is by circulation pump water tap to be sent in the drilling fluid pressurization, and high pressure drilling liquid enters and arrives drill bit in the drill string by water tap, at the shaft bottom cutting carring, by the annular space between the drill string and the borehole wall, upwards flows out well.In drilling process, because the geological condition complexity, strata pressure alters a great deal.Run into lower permeability formation of strata pressure or high-pressure oil-gas layer through regular meeting.When running into the low-pressure permeability stratum, adopt conventional direct circulation drilling well, very low even drilling fluid density drops to, the situation of drilling fluid leakage in the stratum also often appears, and cause and carry shaft bottom landwaste difficulty, contaminated oil gas-bearing formation.When running into high-pressure oil-gas layer, need to improve drilling fluid density, cause problems such as bit speed reduction, stuck drilling tool.For finishing oil, natural gas well drilling well work, adapt to the bad ground situation, must drop into large number quipments and mud materials, promptly increase drilling cost, again oil reservoir is polluted, reduced oil and gas production or produce oil not, sometimes even can't bore and reach target zone.
Now, the reverse circulating drilling well new method of a kind of gaslift is arranged, be mainly used in the construction of well, hydrogeological well drilling engineering.The characteristics of this boring method are to take the anti-recirculated water cutting carring of gaslift.This method has that the cutting carring ability is strong, and rate of penetration is fast, the long service life of drill bit, and drilling cost is low, prevents advantages such as leakage.The reverse circulating method of this gaslift mainly is to utilize air compressor earlier air to be compressed into gases at high pressure.Gases at high pressure enter double-deck water tap by air inlet pipe, and the gas passage between pipe and the outer tube in double-deck water tap, double-deck kelly bar, double-deck drilling rod enters carbo-charger and is pressed into pipe in the double-deck drilling rod again.Pipe formation tiny bubble mixed with water in the drill string in the pressure-air that is pressed into entered.Tiny bubble is constantly lifting and expansion in the water in drill string, promotes the liter waterborne in the pipe in the drill string.Pressure-air constantly enters in the drilling rod and mixes with water, forms low-density gas, aqueous mixtures in the interior pipe on blender top.And in the annular space of drill string outside, the density of water remains unchanged.Formed the density of the aerial water density of drill string outer shroud greater than gas, aqueous mixtures in the drill string like this, pressure is less than the outer pressure of drill string in the drill string.According to law of connected vessels, the water of drill string outside is carrying the shaft bottom landwaste under the effect of pressure reduction, constantly enters in the drill string and upwards by bit port and flows, and forms anti-circulation, until ground, arrives sand trap.Through precipitation, remove the later current of landwaste and return hole annulus, arrive the shaft bottom through annular space.After water arrives the shaft bottom, again in bit port enters drill string.So constantly anti-circulation of drilling fluid, the not stall under the drive of rotating disk of drilling rod and drill bit is moving, is taken to ground by the landwaste of drill bit fragmentation by reverse circulating water.The pressure of the gases at high pressure that use is generally between 0.6-3Mpa.Air quantity is by the decision of drilling rod internal diameter size.During as 95mm, its air quantity is about 4m such as: the internal diameter that uses drilling rod
3/ min; When using the drilling rod internal diameter as 120mm, its air quantity is about 5m
3/ min.The boring method of the anti-recirculated water of prior art gaslift is applied to obtain promoting the use of in well, the construction of hydrogeological well drilling engineering.Obtained effect preferably, solved and bored the many practical problems that exist in well, the hydrogeological well technology.The method of the anti-recirculated water of prior art gaslift, the target zone of being drilled are argillic horizon or low pressure stabilized zone, can not cause the high pressure blowout, and more impossible image-stone oil, the natural gas well are drilled into high-pressure oil-gas layer like that, and blowout takes place, ejection natural gas or oil.The equipment that boring method adopted of the anti-recirculated water of existing gaslift mainly contains air compressor, high-pressure pipe, double-deck water tap, double-deck kelly bar, double-deck drilling rod, carbo-charger, common drilling rod, drill bit.With high-pressure pipe air compressor is connected with double-deck water tap.Connect double-deck kelly bar under the double-deck water tap.Double-deck kelly bar is down with the double-deck drilling rod that is threaded.Connect carbo-charger under the double-deck drilling rod.Connect common drilling rod, drill collar and drill bit under the carbo-charger.
Being in the drilling engineering of purpose with oil, natural gas, finish a bite well, generally need to bore deeply at 2000 meters to 6000 meters, the darkest well can reach ten thousand metres.The down-hole geological condition is very complicated, and strata pressure changes greatly, meets high-pressure oil-gas layer on occasion, and blowout may take place; Meet the low pressure lost-circulation zone on occasion, the drilling fluid leakage phenomenon may take place.In the existing anti-recirculated water boring method of gaslift, the circulation of fluid of employing is water, and the density of water is 1g/cm
3, can not base area stressor layer situation change its density.The ground installation of existing gaslift counterflush drilling liquid technology can not adapt to oil, natural gas well drilling well requirement, lacks well-control equipment, does not have effectively to control the technological measure of blowout or leakage.When being drilled to high-pressure oil-gas layer, drilling fluid density is controlled improper easy initiation gas blowout accident in the well.After blowout took place, the anti-recirculated water boring method of existing gaslift was not controlled the equipment of blowout, does not have the kill-job measure yet, in case blowout takes place, can cause casualties and economic loss.When leakage took place, drilling fluid was missed in a large number, strengthened drilling cost, can't creep into during severe leakage, also can't adjust drilling fluid density and prevent leakage.Existing gaslift counterflush drilling method and apparatus can't be realized the oil gas well drilling operation.
The objective of the invention is, overcome existing gaslift counterflush drilling method and equipment and can only be adapted to bore well, hydrogeological well, promptly strata pressure changes little well, can not adapt to the oil of geological condition complexity, the shortcoming that natural gas well drilling well requires.Innovate, improve from drilling technology and equipment aspect, prevention and control gas blowout accident, leakage accident take place, and make gaslift counterflush drilling technology can be applied to oil, natural gas well drilling well requirement, can finish oil, natural gas well drilling well task.
For realizing purpose of the present invention, on the basis of existing anti-recirculated water drilling technology, bigger innovation and improvement have all been carried out in its well-drilling technology, employed circulation fluid and equipment configuration aspect.
The present invention is different at the equipment and the reverse circulating equipment of original technology gaslift that are achieved in that oil, natural gas well gaslift counterflush drilling liquid drilling technology aspect the equipment configuration.The capital equipment that the present invention adopts has air compressor, high-pressure pipe, water tap, double-deck kelly bar, double-deck drilling rod, carbo-charger, common drilling rod, drill collar and drill bit.High-pressure pipe one end connects air compressor.Double-deck kelly bar is down with the double-deck drilling rod that is threaded.Connect common drilling rod, drill collar and drill bit under the carbo-charger.The present invention adopts the technical characterictic of corollary equipment aspect to be: the high-pressure pipe other end connects double-deck gas injection joint.High-pressure pipe is a kind ofly can bear the 1-15MPa flexible pipe, and length is between 20 meters to 40 meters.Double-deck gas injection joint top picks out hydraulic control valve, goes out hydraulic control valve top and connects common drilling well water tap.Water tap top connects water under high pressure tengential belt, high pressure line and connects circulation pump.Connect double-deck kelly bar under the double-deck gas injection joint.Subordinate's T-Ring shape blowout prevention valve under the double-deck drilling rod.The annular blowout prevention valve is a kind of ball-and-seat, closes automatically when blowout takes place.Connect carbo-charger under the annular blowout prevention valve.The installation work of these equipments can both be finished the drilling technology workman, is not described in detail.At well head preventer is installed.Preventer is an approved product, and its installation work is finished by the driller.The re-injection mouth of re-injection drilling fluid is arranged at preventer top.High pressure line one end connects circulation pump, and an end connects preventer re-injection mouth.The drilling fluid that can realize ground like this is recycled into the well head annular space.Circulation pump can pass through high pressure line, re-injection mouth annular space re-injection drilling fluid in well.The technology of the present invention feature also has under the water tap installs out hydraulic control valve.Going out hydraulic control valve is when well kick taking place, when drilling fluid is gushed out in the drill string, can in time close, effectively controlling the blowout in the drill string.Double-deck drilling rod connects annular blowout prevention valve down, and when blowout took place, annular blowout prevention valve was closed automatically, prevents the gas passage ejection between pipe and the outer tube in the double-deck drilling tool of well liquid.Preventer is installed on well head, when blowout takes place, is in time closed hole annulus, the outer blowout of control drill string.At floor mounted kill-job choke manifold, drilling fluid processor.The work of present device is installed can be finished by the workman of drilling team under drilling technology personnel's guidance.
Concrete operation method of the present invention is: utilize air compressor earlier air to be compressed into gases at high pressure.Gases at high pressure enter in the double-deck drilling tool gas passage between pipe and the outer tube by high-pressure pipe, are pressed into carbo-charger and enter pipe in the double-deck drilling tool.Pipe formed drilling fluid mixed in tiny bubble and the drill string in the compressed air that is pressed into entered.In the interior pipe on carbo-charger top, form the drilling fluid lower than the drilling fluid density outside the drill string.The drilling fluid of drill string outside is under the effect of pressure reduction, and cutting carring enters in the drill string and upwards flows by bit port, through water tap, hose, high pressure line, until arriving the drilling fluid processor.Rotating disk drives drilling tool and drill bit rotates, broken rock.The present invention at the technical characterictic of operating procedure process is: gases at high pressure are the air ducts that enter double-deck drilling tool by double-deck gas injection joint.Gases at high pressure pressure is between 0-6MPa, and the gases at high pressure flow is at 2-5m
3Between/the min.By circulation pump drilling fluid is injected re-injection mouth on the preventer, and enter hole annulus, be hole annulus off set drilling liquid.Re-injection pressure is between 0-30MPa.Under drilling fluid deadweight and the acting in conjunction of gaslift pressure reduction, drilling fluid is in bit port enters drill string, through anti-drilling fluid processors that is circulated back to such as water tap, hoses.
Be higher than drilling fluid density when being drilled into the down-hole formation pressure coefficient, the pressure of down-hole fluid column, adds the drilling fluid heavy weight additive in the drilling fluid processor when well kick, blowout take place less than bottom pressure, becomes the kill-job drilling fluid with drilling fluid mixed.Be mixed with the kill-job drilling fluid density at 1.2-2.5g/cm
3Between.Drilling fluid heavy weight additive kind has blanc fixe, Iron Ore Powder etc.By circulation pump the kill-job drilling fluid is injected into hole annulus.Make drilling fluid density raising in the well, reach closely stressor layer of pit shaft head of liquid.The pump pressure of circulation pump is between 5-30MPa.
When being drilled into the down-hole formation pressure coefficient and being lower than drilling fluid density, the head of liquid of down-hole drilling fluids is higher than the shaft bottom strata pressure, and the leakage phenomenon may take place.When leakage takes place when, the drilling fluid palliative is added in the drilling fluid processor, be mixed with low density drilling fluid.The density of low density drilling fluid is at 0.6-1.2g/cm
3Between.Drilling fluid palliative kind is a lot, as blowing agent, diesel oil etc.By circulation pump low density drilling fluid is injected into hole annulus.Make drilling fluid density reduction in the well, reach closely stressor layer of drilling fluid column pressure.The slush pump pump pressure is between 0-5MPa.
Effect of the present invention: circulation pump is connected with preventer re-injection valve with high pressure line.Circulation pump is by high pressure line, preventer re-injection valve annular space re-injection drilling fluid in well.The density of re-injection drilling fluid can be adjusted in base area stressor layer variation, and the pressure and the strata pressure that arrive drilling fluid in the well keep balance, pre-well blowout preventing, well kick or leakage accident.Under the water tap hydraulic control valve is installed out,, when drilling fluid is gushed out in the drill string, is in time closed, effectively control the blowout in the drill string when well kick takes place.Annular blowout prevention valve between double-deck drilling rod and carbo-charger when blowout takes place, is closed automatically, prevents that well liquid from spraying from double-deck drill string gas passage.Preventer is installed on well head, when blowout takes place, is closed in time that hole annulus is provided with, the outer blowout of control drill string.There is the drilling fluid processor can remove landwaste in the drilling fluid in floor mounted, the more important thing is the adjustment drilling fluid density, make the drilling fluid of re-injection and strata pressure keep balance.Owing to take multinomial prevention and control blowout, leakage measure, adapted to oil, natural gas well geological conditions complexity, reservoir pressure coefficient changes characteristics greatly.Overcome the probing that existing gaslift counterflush drilling method and equipment can only be adapted to well, geology well, can not adapt to the oil of geological condition complexity, the shortcoming that natural gas well drilling well requires, reach prevention or control gas blowout accident, the generation of leakage accident, make gaslift counterflush drilling technology can be fit to the drilling well requirement of oil, the natural gas well, finish the drilling well task.
Description of drawings:
Illustrations is represented to be, the main equipment and the process flow diagram of gaslift counterflush drilling of the present invention.Pressure-air that small arrow refers to the route of process.Anti-direction that circulates of drilling fluid that long arrow refers to and route, wherein interrupted drilling fluid that long arrow refers to mixes direction and the route that flows in the back with gases at high pressure, continuous long arrow refers to direction and the route that drilling fluid after treatment flows.Water tap (1), go out hydraulic control valve (2), double-deck gas injection joint (3), double-deck kelly bar (4), rotating disk (5), high-pressure pipe (6), air compressor (7), preventer (8), double-deck drilling rod (9), annular blowout prevention valve (10), carbo-charger (11), drilling rod (12), drill collar (13), drill bit (14), gas-liquid separator (15), kill-job choke manifold (16), high pressure line (17), hose (18), slush pump (19), valve (20), drilling fluid processor (21);
Embodiment:
3400 meters dark oil wells are example to finish flatly.Learn this mouthful well strata pressure situation of change according to the survey data in this area in the past: at 2300-2400 meter layer is low pressure leakage section, and reservoir pressure coefficient is 0.90; At 2900-3100 rice is the high pressure formation section, and pressure coefficient 1.50 well kick, blowout takes place easily.If adopt prior art reverse circulation drilling well water technology, can't finish drilling well work.
Realize reverse circulating equipment of drilling fluid of the present invention and installation: capital equipment has air compressor (7), and model is WF-5/60, and pressure at expulsion is that 6MPa, volume flow are 5m
3/ min.High-pressure pipe (6) is the high-pressure hose that can bear 10MPa, and internal diameter is 100 millimeters, and length is 35 meters.Water tap (1) is the ordinary faucet (1) that oil drilling uses.Double-deck gas injection joint (3) is the double-deck joint of a kind of rotatory sealing, and its top connects hydraulic control valve (2), and the bottom connects double-deck kelly bar (4).The sealing means of gas passage and the double-deck kelly bar (4) of original technology, double-deck drilling rod (9) are identical.
With high-pressure pipe (6) air compressor (7) is connected with double-deck gas injection joint (3).Double-deck gas injection joint (3) top connects common drilling well water tap (1).Water tap (1) top connects water under high pressure tengential belt (18), high pressure line (17) and connects circulation pump (19).Go out double-deck gas injection joint (3) is installed under the hydraulic control valve (2), going out hydraulic control valve (2) external diameter is 230 millimeters, 600 millimeters of length, and there is the drilling rod screw thread at two ends.Connect double-deck kelly bar (4) under the double-deck gas injection joint (3).Double-deck kelly bar (4) diameter of inner pipe is 73 millimeters, and length is 13 meters.Double-deck kelly bar (4) is down with the double-deck drilling rod (8) that is threaded.Double-deck drilling rod (8) internal diameter also is 73 millimeters, and length is 9 meters.Connect carbo-charger (11) under the double-deck drilling rod (9).Carbo-charger (11) is identical with the carbo-charger of original technology.Connect common drilling rod (12), drill collar (13) and drill bit (14) under the carbo-charger (11).At well head preventer (8) is installed.Preventer (8) is a kind ofly can bear the preventer that operating pressure is 35MPa.Its installation work can be finished by the driller.The individual re-injection mouth that the re-injection drilling fluid is arranged of preventer (8).With high pressure line (17) slush pump (19) is connected with the re-injection mouth,, realizes the positive and negative circulation of drilling fluid by switching gate (20).
The well site, ground is equipped with gas-liquid separator (15), kill-job choke manifold (16), drilling fluid processor (21).These equipment have approved product, and its installation work is finished by field worker.
Operating procedure process of the present invention: utilize air compressor (7) earlier air to be compressed into gases at high pressure.Gases at high pressure enter the air duct of double-deck kelly bar (4) by double-deck gas injection joint (3).The pressure of gases at high pressure is 4MPa, and the gases at high pressure flow is 5m
2/ min.Gases at high pressure enter the gas passage between double-deck kelly bar (4), the interior pipe of double-deck drilling rod (8) and the outer tube, enter carbo-charger (11) and are pressed into pipe in the double-deck drilling rod (9) through annular ball-and-seat (10).Pipe formed drilling fluid mixed in tiny bubble and the drill string in the compressed air that is pressed into entered.The low drilling fluid of drilling fluid density outside in blender (11) top, forming than drill string in the pipe.The density of drilling fluid is 0.8g/cm in the drill string
3, drill string outer ring space drilling fluid density is 1.3g/cm
3The drilling fluid of drill string outside is under the effect of pressure reduction, and cutting carring constantly enters interior also the making progress of drill string by drill bit (14) hydrophthalmia and flows, and until ground, arrives drilling fluid processor (21) at last.Rotating disk (5) drives drilling tool and drill bit (14) rotates, broken rock.Drilling fluid through purified treatment passes through in circulation pump (19) reinjection well.Drilling fluid enters in the drill string the anti-drilling fluid processor (21) that is circulated back in the hole annulus through drill bit (14) hydrophthalmia under deadweight and the acting in conjunction of gaslift pressure reduction.
When to be drilled into down-hole 2300-2400 meter layer be low pressure leakage section reservoir pressure coefficient 0.90 the time, the density of down-hole drilling fluids is 1.30, is higher than bottom pressure, and the leakage phenomenon may take place.When leakage takes place when, the drilling fluid palliative is added in the drilling fluid processor (21), preparation density is at 1.1g/cm
3Low density drilling fluid.The palliative that adds is a blowing agent.The low density drilling fluid for preparing is injected into re-injection mouth on the preventer (8) by circulation pump (19).Make drilling fluid density reduction in the pit shaft, head of liquid descends thereupon.Reach closely stressor layer of pit shaft head of liquid, the balance that keep-ups pressure overcomes leakage.If adopt original technology, when being drilled into reservoir pressure coefficient and being 0.9 leakage stratum, can not adjust property of drilling fluid, reduce density, run into such stratum, can't creep into.
When being drilled into 2900 meters, enter high pressure formation, reservoir pressure coefficient is 1.5, and well kick takes place, and controls bad blowout to take place.Down-hole drilling fluids density is 1.2, is lower than bottom pressure.In time the drilling fluid heavy weight additive is added in the drilling fluid processor (21), preparation density is at 1.6g/cm
3Well killing fluid.The heavy weight additive that adds is a blanc fixe.The well killing fluid for preparing is injected into re-injection mouth on the preventer (8) by circulation pump (19), enters hole annulus.Make the interior drilling fluid density of well bring up to 1.6g/cm
3, reach closely stressor layer of drilling fluid column pressure.Circulation pump (19) pump pressure is at 10MPa, and its flow is 2m
3/ min.Prevent well kick, gas blowout accident in advance.
If above-mentioned pre-well blowout preventing is success not, gas blowout accident has taken place, not fearful yet.Carried out the preparation of control blowout.Hydraulic control valve (2) is installed out under the water tap (1).Go out hydraulic control valve (2) when well kick takes place, when drilling fluid is gushed out in the drill string, in time close, effectively control the ejection of well liquid in the drill string.Preventer (8) is installed on well head, when blowout takes place, can be closed preventer (8), the ejection of control drill string outer ring space drilling fluid.
When the drilling well of counterflush drilling liquid can not realize, can use the direct circulation drilling well instead and continue to finish drilling well work.The process of changing into the direct circulation drilling well is: at first, stop the work of air compressor (7), stop to annotate pressure-air in drilling tool.Secondly, switch gate (20), make drilling fluid pass through circulation pump (19) pressurization after, in drilling tool, annotate drilling fluid through high pressure line (17), hose (18), water tap (1).Drilling fluid by drill bit (14) to annular space, upward to preventer (8) and flow to drilling fluid processor (21).Drilling fluid behind the removing landwaste enters in the drilling tool by circulation pump (19) pressurization.The present invention can change into the drilling well of direct circulation drilling fluid with the drilling well of counterflush drilling liquid when the drilling well need of work.
Claims (7)
1, a kind of oil, natural gas well gaslift counterflush drilling method, be to utilize air compressor (7) earlier air to be compressed into gases at high pressure, gases at high pressure enter double-deck kelly bar (4), gas passage in the double-deck drilling rod (9) between pipe and the outer tube, enter carbo-charger (11) and be pressed into pipe in the double-deck drilling rod (9), in drill string and drilling fluid mixed, in the interior pipe on blender (11) top, form the mixing drilling fluid lower than the drilling fluid density outside the drill string, the drilling fluid of drill string outside is under the effect of pressure reduction, cutting carring, in drill string on flow, by water tap (1), hose (18) arrives ground drilling fluid processor (21), after processing such as removing landwaste, replenish into drill string outer ring space, its technical characterictic is: the pressure of gases at high pressure is between the 0-6MPa, and the gases at high pressure flow is at 2-5m
3Between/the min, the pressure gases at high pressure are the air ducts that enter double-deck kelly bar (4) by double-deck gas injection joint (3), treated drilling fluid is by circulation pump (19) re-injection hole annulus, re-injection pressure is between 0-30MPa, when well kick, blowout take place when, the drilling fluid heavy weight additive is added in the drilling fluid processor (21), preparation kill-job drilling fluid, density is at 1.2-2.5g/cm
3Between, being injected into re-injection mouth on the preventer (8) by circulation pump (19), pressure injection is to hole annulus, the pump pressure of circulation pump (19) is between 5-30MPa, when leakage takes place when, the drilling fluid palliative is added in the drilling fluid processor (21), preparation density is at 0.6-1.2g/cm
3Between low density drilling fluid, by circulation pump (19) drilling fluid is injected into preventer (8) re-injection mouth, and pressure injection is to hole annulus, the pump pressure of circulation pump (19) is between 0-5MPa.
2, a kind of oil, the employed corollary equipment of natural gas well gaslift counterflush drilling method, air compressor (7) is arranged, high-pressure pipe (6), water tap (1), double-deck kelly bar (4), double-deck drilling rod (9), carbo-charger (11), common drilling rod (12), drill collar (13) and drill bit (14), double-deck kelly bar (4) connects double-deck drilling rod (9) down, carbo-charger (connects common drilling rod (12) 11 times, drill collar (13) and drill bit (14), the technical characterictic of the present invention aspect corollary equipment is: high-pressure pipe (6) other end connects double-deck gas injection joint (3), high-pressure pipe (6) can bear the 1-15MPa flexible pipe, length is between 20 meters to 40 meters, double-deck gas injection joint (3) top connects common drilling well water tap (1), water tap (1) top connects water under high pressure tengential belt (18), high pressure line (17) also connects circulation pump (19), hydraulic control valve (2) is installed out under the water tap (1), go out and connect double-deck gas injection joint (3) under the hydraulic control valve (2), double-deck kelly bar (4), double-deck drilling rod (9) is T-Ring shape blowout prevention valve (10) down, connect carbo-charger (11) under the annular blowout prevention valve (10), at well head preventer (8) is installed, the re-injection mouth that the re-injection drilling fluid is arranged on the preventer (8), high pressure line (17) one ends connect circulation pump (19), one end connects preventer (8) re-injection mouth, in floor mounted kill-job choke manifold (16) is arranged, drilling fluid processor (21) and gas-liquid separator (15).
3, a kind of oil as claimed in claim 1, natural gas well gaslift counterflush drilling method, it is characterized in that: the drilling fluid heavy weight additive is a blanc fixe.
4, a kind of oil as claimed in claim 1, natural gas well gaslift counterflush drilling method, it is characterized in that: the drilling fluid palliative is a blowing agent.
5, a kind of oil as claimed in claim 1, natural gas well gaslift counterflush drilling method, it is characterized in that: the drilling fluid heavy weight additive is an Iron Ore Powder.
6, a kind of oil as claimed in claim 1, natural gas well gaslift counterflush drilling method, it is characterized in that: the drilling fluid palliative is a diesel oil.
7, as claim 1, or 3, or 4, or 5, or 6 described a kind of oil, natural gas well gaslift counterflush drilling method, the drilling well of counterflush drilling liquid it is characterized in that: when can not realize, change the direct circulation drilling well into, at first, stop the work of air compressor (7), stop in drilling tool, annotating pressure-air, secondly, switch gate (20), after making drilling fluid pass through circulation pump (19) pressurization, through high pressure line (17), hose (18), water tap (1) is annotated drilling fluid in drilling tool, drilling fluid returns drilling fluid processor (21) from preventer (8) inlet, drilling fluid behind the removing landwaste enters in the drilling tool by circulation pump (19) pressurization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100336 CN1206441C (en) | 2002-01-11 | 2002-01-11 | Reverse cycle drilling method and equipment for oil well or gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100336 CN1206441C (en) | 2002-01-11 | 2002-01-11 | Reverse cycle drilling method and equipment for oil well or gas well |
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| CN1356451A true CN1356451A (en) | 2002-07-03 |
| CN1206441C CN1206441C (en) | 2005-06-15 |
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| CN 02100336 Expired - Fee Related CN1206441C (en) | 2002-01-11 | 2002-01-11 | Reverse cycle drilling method and equipment for oil well or gas well |
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| CN102230377A (en) * | 2011-06-02 | 2011-11-02 | 中国海洋石油总公司 | Multifunctional gas lifting strata testing string |
| CN102877812A (en) * | 2012-09-14 | 2013-01-16 | 中国石油大学(华东) | Method of balancing pressure for well cementation |
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| CN103615191A (en) * | 2013-12-06 | 2014-03-05 | 中国石油大学(北京) | Pumping-pressure reverse-circulation well drilling method and system |
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| CN105178859A (en) * | 2015-10-10 | 2015-12-23 | 中国石油集团川庆钻探工程有限公司 | Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling |
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