A kind of continuous circulating device of casing job and methodTechnical field
The present invention relates to oilfield drilling field of engineering technology, specifically a kind of continuous circulating device of casing job and sideMethod.
Background technology
Changqing oilfields deep drilling gets more and more in recent years, under the large scale bunch tube weight that enters increasing, cause setPipe load becomes closer to or exceedes the maximum safe load of selected rig, is according to SY/T6724-at present in creeping into design2008 " oil-well rig and workover rig basic configuration standards " select the rig of dimension.But due to big chi in real workVery little bunch tube load is relatively big, often beyond rig (such as ZJ50) selection standard 20-30 ton, as used relatively wammel instead by design standardMachine (such as ZJ70), but cause unnecessary waste, drilling engineering design brings great difficulty.
For above technical barrier, current Drilling Design has techniques below scheme:
1, during Drilling Design, it is considered to the effect of sleeve pipe buoyancy, this reduces the actual weight of sleeve pipe actual weight, i.e. sleeve pipeWeight * 0.862 in amount=sleeve pipe air；
2, during Drilling Design, the effect of sleeve pipe buoyancy is being considered simultaneously, if sleeve pipe actual weight is still greater than rig load,Now will consider that the inside of bunch tube is emptied, and i.e. have one section of (top) bunch tube not to be in the milk, make the actual weight of bunch tube enterOne step reduces；
3, during setting of casing.Applied pressure by annulus, reaches to improve the effect of bunch tube overall buoyancy；
In above-mentioned 3 technical schemes, if midway due to well necking down, fall the problem such as block, leakage need drilling fluid to be circulated time,Actual the emptying of bunch tube does not the most exist, and bunch tube load will be greater than rig maximum load, at present without effective technology counter-measure.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the invention provides a kind of casing job and circulate dress continuouslyPut and method, during the present invention enters in operation under sleeve pipe is emptied, can circulate halfway, but inside pipe casing will not be made all to fillThe round-robin method of full drilling fluid, when making to go into the well, sleeve pipe can circulate, and does not the most increase bunch tube actual load.
The technical solution used in the present invention is:
A kind of continuous circulating device of casing job, including well and sleeve pipe, the speciality that described sleeve pipe and lower end are sequentially connected with is shortJoint, float collar form bunch tube, and described bunch tube is positioned at well, are provided with pipe continuously, described continuous pipe in described sleeve pipeLower end connects has packer, described packer to be positioned at special pipe nipple, is provided with check valve between described packer and continuously pipe.
Described packer lower end is provided with nozzle.
Described packer is glue tub packer.
The internal diameter 2mm bigger than conventional cannula of described speciality pipe nipple, its fineness reaches 7.
The a length of 1-1.5m of described speciality pipe nipple.
Described sleeve outer 244.5mm；Described continuous pipe external diameter 62mm.
A kind of continuous round-robin method of casing job, concretely comprises the following steps:
Step one in well under enter the bunch tube that sleeve pipe, special pipe nipple and float collar are connected in sequence, by under the sleeve pipe that enters sitAt well head；
Pipe, check valve and packer continuously are sequentially connected with by step 2, and under being full of after circulation fluid in the pipe continuously that will connectEnter in the sleeve pipe at well head；
Step 3 will carry out turn on pump circulation under the packer in step 2 after at the special pipe nipple in step one；
After step 4 completes circulation, close circulating pump, and on carry continuous pipe and go out well head；
After step 5 has circulated, continue setting of casing；
Step 6 is during follow-up setting of casing, and when being circulated, repeat the above steps, until fulfiling assignment.
Concretely comprising the following steps of turn on pump circulation in described step 3:
Circulation fluid is entered continuous tube cavity, circulation fluid the pushing away at pressure in inner chamber by ground circulating pump by the first stepDynamic descending lower at check valve, pressure rises 1.5MPa；
The circulating liquid of the continuous tube cavity of second step, under the effect of high pressure, opens check valve, and circulation fluid enters in packer,The liquid thick stick promoting packer is up, compresses glue bucket, sets continuously the annular space of pipe and sleeve pipe；
After circulating liquid compression glue bucket in 3rd step packer, opening the nozzle bottom packer, circulating liquid enters wellThe end；
4th stepping enters the circulating liquid in shaft bottom under the effect of geostatic pressure, enters the annular space of well and sleeve pipe, returns out ground.
The invention have the benefit that
The present invention, during setting of casing, can carry out midway circulating fluid, inside pipe casing will not be made again to be full of drilling fluid, fullEmpty state during entering under foot cover pipe, reduce down and enter to overlap tube load, it is ensured that the safety entered under sleeve pipe, save drilling well and becomeThis.The packer that the present invention uses is glue tub, and the packer of glue tub can effectively set, and set is effective, sealsPerformance is strong.The same special pipe nipple used is that the inwall of conventional pipe nipple is carried out sanding and polishing so that the glossiness of pipe nipple inwallReaching 7, the when that the pipe nipple being prepared out being packer setting, its surface tension becomes the big and sealing of packer contact surfaceProperty enhance, also prevent simultaneously circulation fluid adverse current, reached bidirectional protective with check valve.
Accompanying drawing explanation
Fig. 1 casing job continuous round-robin method schematic diagram
In figure, reference: 1, well head；2, well；3, sleeve pipe；4, manage continuously；5, check valve；6, packer；7, nozzle；8, specialMatter pipe nipple；9, float collar.
Detailed description of the invention
Embodiment 1:
In order to overcome well necking down, fall the problem such as block, leakage need drilling fluid to be circulated time, actual the emptying of bunch tube is not the most deposited, bunch tube load will be greater than the problem of rig maximum load, and the present invention provides a kind of casing job as shown in Figure 1 continuousCirculating device and method, during the present invention enters in operation under sleeve pipe is emptied, can circulate halfway, but will not make inside pipe casingBeing completely filled with the round-robin method of drilling fluid, when making to go into the well, sleeve pipe can circulate, and does not the most increase bunch tube actual load.
A kind of continuous circulating device of casing job, including well 2 and sleeve pipe 3, described sleeve pipe 3 and lower end are sequentially connected withSpeciality pipe nipple 8, float collar 9 form bunch tube, and described bunch tube is positioned at well 2, are provided with continuous pipe 4, institute in described sleeve pipe 3Continuous pipe 4 lower end stated connects has packer 6, described packer 6 to be positioned at special pipe nipple 8, described packer 6 and continuous pipe 4Between be provided with check valve 5.
In the present embodiment, in the continuous pipe 4 of well head 1, pump into circulation fluid, circulate under the gravity effect with geostatic pressureLiquid is descending, enters packer 6 through check valve 5, and the circulation fluid after entrance is after pressure strengthens 2 MPa so that packer swellsSet with special pipe nipple 8, and open the nozzle 7 bottom packer 6 so that circulation fluid enters well 2 end by nozzle 7Portion, circulation fluid, under the effect of external force, returns to ground from the annular space of well 2 with sleeve pipe 3.
This special pipe nipple that the present invention uses, simple in construction, running cost is low and effectively prevent well 2 necking down, fallWhen the problem such as block, leakage needs drilling fluid to be circulated, actual the emptying of bunch tube does not the most exist, and bunch tube load will be greater than rigThe problem of big load.
Embodiment 2:
On the basis of embodiment 1, in the present embodiment, described packer 6 lower end is provided with nozzle 7.
Described packer 6 is glue tub packer.
The internal diameter 2mm bigger than conventional cannula of described speciality pipe nipple 8, its fineness reaches 7.
The a length of 1-1.5m of described speciality pipe nipple 8.
Described sleeve pipe 3 external diameter 244.5mm；Described continuous pipe 4 external diameter 62mm.
The packer 6 that the present invention uses is glue tub, and the packer 6 of glue tub can effectively set, the effect setGood, sealing property is strong.The same special pipe nipple 8 used is that the inwall of conventional pipe nipple is carried out sanding and polishing so that pipe nipple inwallGlossiness reach 7, the pipe nipple being prepared out is the when that packer 6 setting, its surface tension become connect with packer 6 greatlyThe sealing of contacting surface enhances, and also prevent circulation fluid adverse current simultaneously, has reached bidirectional protective with check valve 5.
Present configuration is reasonable and compact, workable during use, uses during sleeve pipe 3 operation that size is big under deep-wellThe present invention can avoid because of borehole wall undergauge, cave in, leakage must circulate time and " sleeve pipe is emptied " measure of losing, it is ensured that existingEnter under deep-well large scale sleeve pipe under the conditions of drilling equipment is smooth, save production cost.
Embodiment 3:
On the basis of above-described embodiment, the present embodiment provides a kind of continuous round-robin method of casing job, concrete stepsFor:
Step one in well 2 under enter the bunch tube that sleeve pipe 3, special pipe nipple 8 and float collar 9 are connected in sequence, by under the set that entersPipe 3 is sitting in well head 1；
Continuous pipe 4, check valve 5 and packer 6 are sequentially connected with by step 2, and are full of circulation fluid in the continuous pipe 4 that will connectIn sleeve pipe 3 at rear lower going-into-well mouth 1；
Step 3 carries out turn on pump circulation after at the special pipe nipple 8 in the packer in step 26 times to step one；
After step 4 completes circulation, close circulating pump, and on carry continuous pipe 4 and go out well head 1；
After step 5 has circulated, continue setting of casing 3；
Step 6 is during follow-up setting of casing 3, and when being circulated, repeat the above steps, until fulfiling assignment.
Concretely comprising the following steps of turn on pump circulation in described step 3:
Circulation fluid is entered continuous pipe 4 inner chamber, circulation fluid the pushing away at pressure in inner chamber by ground circulating pump by the first stepDynamic descending lower at check valve 5, pressure rises 1.5MPa；
The circulating liquid of second step continuous pipe 4 inner chamber, under the effect of high pressure, opens check valve 5, and circulation fluid enters packer 6In, the liquid thick stick promoting packer is up, compresses glue bucket, sets the annular space of continuous pipe 4 and sleeve pipe 3；
After circulating liquid compression glue bucket in 3rd step packer 6, opening the nozzle 7 bottom packer 6, circulating liquid entersShaft bottom；
4th stepping enters the circulating liquid in shaft bottom under the effect of geostatic pressure, enters the annular space of well 2 and sleeve pipe 3, returns out groundFace.
In the present embodiment, by Drilling Design, sleeve pipe 3 lower end is connected upper special pipe nipple 8；The sleeve pipe 3 entered under by is by hangingCard is sitting in well head 1；Check valve 5, packer 6, continuous pipe 4 are threaded connection；Fill in the continuous pipe 4 that will connectFull circulation fluid；In the sleeve pipe 3 at continuous pipe 4 lower going-into-well mouth 1 that will connect；By 6 times special pipe nipples 8 to sleeve pipe 3 of packerPosition, open cycle pump.
The circulating liquid pressure effect by circulating pump, enters continuous pipe 4 inner chamber；The circulation fluid of down-hole continuous pipe 4 inner chamberBody is descending under the promotion of pressure, is recycled at check valve 5, and pressure rises 1.5MPa；The circulating liquid of pipe 4 inner chamber is at height continuouslyUnder the effect of pressure, open check valve 5, enter in packer 6；And then the liquid thick stick of promotion packer 6 is up, compresses glue bucket, sitsSeal the annular space of continuous pipe 4 and sleeve pipe 3；After circulating liquid compression glue bucket in packer 6, open the nozzle 7 bottom packer 6；So cycle of higher pressure liquid after pressurization enters shaft bottom；The circulating liquid in shaft bottom under the effect of geostatic pressure, enter well 2 withThe annular space of sleeve pipe 3, and return out ground.
The present invention is in cyclic process, and sleeve pipe 3 is internal without drilling fluid；Now the suspending weight of well inner sleeve 3 is the floating of sleeve pipe 3Weight, does not has the weight of liquid in sleeve pipe 3, and integral cannula 3 gravity alleviates 5-8%.
After completing whole circulation, termination of pumping；Continuous pipe 4, upper lifting force 20-25 ton is carried on well head 1.Glue bucket within packer 6Unsealing under the effect of upper lifting force, packer 6 and the special pipe nipple 8 setting place separate.Due in sleeve pipe 3 without circulating liquid,Under the effect of pressure reduction, the closed check valve within sleeve pipe 3 bottom float collar 9, the circulating liquid making well 2 and sleeve pipe 3 annular space can notEnter in sleeve pipe 3；After circulation stops, the check valve 5 of continuous pipe 4 bottom is closed under contained spring elastic force effect, in continuous pipe 4The circulating liquid in portion can not be further continued for flowing out.Sleeve pipe 3 is internal without drilling fluid, above carries continuous pipe 4 and goes out well head.After circulation completes, continueContinuous setting of casing 3, during follow-up setting of casing 3, as need to be again circulated, repeats above-mentioned action, until operation completes.
So during the sleeve pipe that lower size is big, midway circulating fluid can be carried out, inside pipe casing will not be made again to fillFull drilling fluid, meets and empties state during entering under sleeve pipe, reduce down and enter to overlap tube load, it is ensured that the safety entered under sleeve pipeProperty, save drilling cost.
Mesh first three alleviates deep-well large scale sleeve pipe actual loading technology contrast table
| Technology contents | Feature |
| Under sleeve pipe routineEnter method | Enter under deep-well large scale sleeve pipe, midway not drilling fluid charge | During the circulation of midway, inside pipe casing and annular space have been completely filled with drilling fluid, enter energy for improving under deep-well large scale sleeve pipe" sleeve pipe is emptied " measure of power does not exists, and actual large scale sleeve pipe setting ability reduces. |
| During well head pressurizationThe side of entering under sleeve pipeMethod | During setting of casing, well head adds back pressure, is equivalent to improve wellLower drilling fluid density, adds sleeve pipe buoyancy.Fill drilling wellLiquid | During the circulation of midway, inside pipe casing and annular space have been completely filled with drilling fluid, for improving to enter under deep-well large scale sleeve pipe" sleeve pipe is emptied " measure of ability does not exists, and actual large scale sleeve pipe setting ability reduces.Easily ground is laminatedLeakage |
| Pipe circulation continuouslyThe side of entering under sleeve pipeMethod | Well head not drilling fluid charge during setting of casing | During the circulation of midway, pipe and annular space have been completely filled with drilling fluid only continuously, inside pipe casing without drilling fluid, " sleeve pipeEmpty " measure existence, actual large scale sleeve pipe setting ability improves. |
In present embodiment, the part of not narration in detail belongs to the known conventional means of the industry, describes the most one by one.WithOn enumerate only illustration to the present invention, be not intended that the restriction to protection scope of the present invention, the every and present inventionWithin same or analogous design belongs to protection scope of the present invention.