CN101492999B - Used of downhole fluid static pressure bearing - Google Patents
Used of downhole fluid static pressure bearing Download PDFInfo
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- CN101492999B CN101492999B CN200810008511.2A CN200810008511A CN101492999B CN 101492999 B CN101492999 B CN 101492999B CN 200810008511 A CN200810008511 A CN 200810008511A CN 101492999 B CN101492999 B CN 101492999B
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Abstract
The invention provides a fluid hydrostatic bearing used for stabilizing a drilling string and operating bottom drilling tool components. The fluid hydrostatic bearing adopts the existing mud stream as bearing fluid. For operation, the bearing can be used between a moveable recoilless pad and stratum to decrease friction. Different fluid hydrostatic bearing pressure can be used for operation selectively. With the same and different fluid hydrostatic bearing pressure selectively adopted, multi-mode (nonlinearity and linearity) operation can be provided. With a plurality of pressure cavities adopted, the bearing can be more resistant against defects in the stratum.
Description
Technical field
The present invention relates generally to drilling well field, and relate more specifically to drill stem stabilization and the manipulation of shaft bottom drill tool assembly.
Background technology
Utilize the oil well depth of current techniques probing can reach several ten thousand feet.This well can be nonlinear, to increase the exposure of producing zone.Depth capacity is subject to the strong mechanical constraints of drilling rod.Particularly, this degree of depth is subject to producing the capabilities limits that the required drilling rod of boring bears compression, stretching, torsion, bending and difference force.Because needs overcome the moment of torsion of friction and the moment of torsion of rotary drilling-head on relative stratum, this drilling rod is subject to twisting resistance.Friction due to the development length He Dui stratum of drill string in deep-well, the reducing of moment of torsion rigidity even can cause stick-slip (stick-slip) effect, in extreme case, this can cause, and tool joint is outwarded winding certainly, drill bit damages, BHA vibrates and other less desirable result.In the manned situation of ground or intermediate casing, at crooked pressure spot place, the worn out sleeve pipe of friction meeting between sleeve pipe and drill string, causes or formation fluid enters well or loses circulation therein.This drilling rod can cause differential sticking and equipment loss with respect to the extension power of mud cake wall.
The known stabilizer segmentation that has a non-rotary sleeve by use reduces drill string and rubs.Load-bearing surface between this sleeve and drilling rod comprises that one group is slided or rolling element bearing.Although this stabilizer segmentation has reduced friction, their relative complex and cost are higher.Because complexity, this stabilizer segmentation is compared with better simply equipment, is more easily out of order.For example, in subsurface environment, ball bearing assembly is demoted and fault especially.Because bearing itself bans use of to reverse, apply power so that sleeve freely-movable, when they are stuck in strata drilling, turnbarrel is not problematic yet.Because it is the product of the cost per unit of stabilizer segmentation and the number of required segmentation, total use cost of this segmentation can be quite large.On 30,000 feet of drill strings, if their every 60 feet use one, need 500 this stabilizer segmentations.
J.G.Boulet, J.A.Shepherd, J.Batham has described the other method that reduces drill string friction: Improved Hole Cleaning and Reduced Rotary Torque by New ExternalProfile on Drilling Equipment, IADC/SPE Drilling Conference, New Orleans, Louisiana.No.59143, Feb 2000 (" Boulet "), it is by reference to being incorporated to here.According to Boulet, outside drill string segmentation profile comprises hydrodynamic bearing.This bearing provides the compression fluid film between drill string and boring.Yet the shape of dynamic pressure segmentation needs extremely complicated and expensive machine, utilizes current manufacturing technology, realizes this solution uneconomical and unactual.In addition, friction when Boulet Hydrodynamic segment design only reduces drill string rotating, and therefore, after the new joint of its Bu Huidui ground increase drilling rod, restart rotation and offer help.
Summary of the invention
According to one embodiment of present invention, for facilitating the equipment of drill-well operation to comprise: the drill string parts that are applicable to inserting drilling well, and comprise: the cavity that can transport pressure fluid, these drill string parts comprise: at least one hydrostatic bearing part, can be used pressure fluid to provide hydrostatic bearing and such as the fluid film between the load-bearing surface of subsurface formations or sleeve.
According to another embodiment of the invention, for facilitating the equipment of the probing handled of drilling well to comprise: bottom drill tool assembly, comprise: drill bit and the main body with the cavity that can transport pressure fluid, bottom drill tool assembly comprises: at least one hydrostatic bearing, can be used pressure fluid so that the fluid film between hydrostatic bearing and load-bearing surface to be provided.
According to another embodiment of the invention, for facilitating the method for drill-well operation to comprise step: by least some direct pressurized fluid are arrived to hydrostatic bearing part, between at least one hydrostatic bearing part of load-bearing surface and drill string parts, provide fluid film, drill string parts comprise the cavity that can transport compression fluid, and are applicable to inserting drilling well.
According to another embodiment of the invention, for the method that facilitates drilling well can operate probing, comprise step: utilize bottom drill tool assembly, comprise: drill bit and the main body with the cavity that can transport pressure fluid, bottom drill tool assembly comprises at least one hydrostatic bearing, uses pressure fluid so that the fluid film between hydrostatic bearing and load-bearing surface to be provided.Particularly, one or more hydrostatic bearings can be with roughly the same pressure operation, to creep into linear drilling well; With the mode that the employing time changes, the subset of bearing can operate under than the relatively larger pressure of other bearing, to provide lateral force to creep into non-linear drilling well.
Use hydrostatic bearing to provide the advantage than original technology for shaft bottom application.For example, the hydrostatic bearing in stabilizer segmentation and handle assembly provide low wearing and tearing, low friction, high load capability and simply, design reliably.In addition, the inside of drilling rod and the pressure reduction between outside can be as the power sources of drive fluid hydrostatic bearing.In addition, multi-cavity bearing can be used in the surface defect improving in resistance to stratum.
Accompanying drawing explanation
Fig. 1 has shown the element of drilling equipment.
Fig. 2 and 3 shows Liao Dan chamber hydrostatic bearing.
Figure 4 and 5 have shown multi-cavity hydrostatic bearing.
Fig. 6 and 7 has shown multi-cavity hydrostatic bearing, and wherein restriction choke diameter equals chamber diameter.
Fig. 8 and 9 has shown porous restriction device hydrostatic bearing.
Figure 10 shows the stabilizer pipe nipple of drilling equipment in greater detail.
Figure 11 has shown along the viewgraph of cross-section of the hydrostatic bearing in the stabilizer pipe nipple of Figure 10 of 10-10.
Figure 12 has shown that hydrostatic bearing is used in along in the manipulation kick-pad in the BHA of the drilling equipment of Fig. 1 of A-A.
Figure 13 and 14 has shown the control system of fluid pressure bias voltage.
Figure 15 and 16 has shown to have operation as the drill bit in the fluid pressure chamber of bias voltage controls, wherein: Figure 16 is the viewgraph of cross-section along the drill bit of Figure 15 of B-B.
The specific embodiment
Fig. 1 has shown drilling equipment.This drilling equipment comprises: terrestrial components (100); A plurality of stabilizer pipe nipples, wherein: stabilizer pipe nipple (or joint) (102) is example; With bottom drill tool assembly (" BHA ") (104).The underground parts of nonstatic such as the drilling equipment of drilling rod (112), stabilizer segmentation (102) and BHA (104) are typically called " drill string ".This BHA comprises drill bit (106) and at least one control member (108), and it can be arranged in drill bit or be higher on BHA.This drill bit stratum (110) that can operate to wear and tear, to form boring.Particularly, drill bit can form than the boring of drilling rod (112) larger diameter, and drilling rod accounts for the most of length of drill string.
For valid function, by forcing water under high pressure (" slurry flows ") through the opening in drill bit, the landwaste being produced by drill bit is removed from drilling well, thereby ring-shape mud outside at drill string but in drilling well inside returns in stream, shifts landwaste onto surface.Then, this returns to slurry flows and can be filtered, and with separated landwaste, and the mud producing is used further to circulation.In order to drive slurry flows and to take landwaste to ground, the mud pressure of the slurry flows pressure ratio drill string outside of drill string inside is larger.
By generation power between the select segment at BHA and stratum, realize and handling.Typically, BHA rotates during drilling.Comprise that therein in an embodiment of a plurality of circumference control members (108), only parts (108) start at any given time, to handle when drilling.Comprise therein in the situation of single control member (108), along with BHA rotation, these single parts are started periodically.In either case, between the different piece on result ShiBHAYu stratum, produce the relatively unbalance of power, be also called lateral force.The applying of lateral force during drilling causes the drilling well departing from.This BHA also will comprise aspect sensor, for the startup of static reference over the ground control member is provided, to realize the result of expectation in the track of drilling well, along the directional control of expecting.
This stabilizer pipe nipple (102) has alleviated owing to contacting the possibility to the damage of drill string with stratum.A plurality of stabilizer pipe nipple parts (114) have been determined the diameter that is greater than drilling rod or drill string.As a result, these stabilizer pipe nipple parts prevent or have at least alleviated near the possibility on the pipe nipple contact stratum of drill string.This drill string will typically comprise a plurality of stabilizer pipe nipples of opening along drill string equi-spaced apart.
One aspect of the present invention is to use hydraulic pressure hydrostatic bearing to improve the performance of a plurality of parts of drilling equipment.Particularly, due to press mold effect, hydrostatic bearing can be used to reduce the friction in stabilizer, so that intrinsic wetting rotation support to be provided, or provides steering force for BHA and drill bit.Yet before describing the improved embodiment of those drilling equipments, applicable description can be used for several embodiment of the hydrostatic bearing of down-hole application.
Fig. 2 and 3 shows Liao Dan chamber hydrostatic bearing (200).Gai Dan chamber hydrostatic bearing comprises: the supply line (202) with supply pressure ps; There is resistance R
1restriction choke (204); There is cavity pressure p
1bearing pressure chamber (206); With bearing oil sealing surface (208), it forms areolar (resistance R with the load-bearing surface (210) that is in the example shown formation wall or sleeve pipe
2).This bearing advantageously has high load capability.The cavity pressure and 2 for example, with 500psi " * 2 " the bearing of area can support potentially to surpass the load of 2000lbs.This ability is enough to support and hang along direction wall bending and the horizontal component of drilling rod potentially.In addition, the inside of drill string and the slurry flows pressure reduction between outside can be enough to realize the operation of hydrostatic bearing.To the special-purpose of bearing be described below.
Figure 4 and 5 have shown multi-cavity hydrostatic bearing (400).Replace single pressure chamber, use the arrangement of less pressure chamber (402).The single pressure chamber of arranging is independent at least in part.Particularly, each chamber has independent restriction choke (404).This restriction choke stops in public gap (406).Because single pressure chamber is independent at least partly, multi-cavity bearing is not very sensitive to the defect (408) in load-bearing surface (210).For example, in the time of in being drilled into rock, the possibility of occur breaking in borehole wall thing and down wash is relatively high.This defect trends towards temporarily increasing gap (406) part, or otherwise by reducing flow resistance R2, damages the pressure reduction of oil sealing surface.In the situation that single cavity designs, compression fluid can through expand gap (304, Fig. 3) more easily overflow, therefore, when there is abundant large skin breakage, pressure chamber loosens pressure, and bearing loses its overall load ability.Yet, utilizing multi-cavity bearing, the loss of load capacity is limited to and is located immediately at defect (408) Shang bearing part, is limited to and bears the single chamber of amplifying gap.Relatively not unaffected in defect Shang chamber, and still can carry load.
Fig. 6 and 7 has shown multi-cavity hydrostatic bearing (600), and wherein restriction choke diameter equals chamber diameter (602).Although because chamber and restriction choke there is no significant difference, the present embodiment is seemingly without chamber, bearing can be molded as multi-cavity bearing, and wherein restriction choke diameter equals chamber diameter.As for previously described embodiment, used little pressure chamber (602) to arrange, and each pressure chamber of arranging is independent at least partly.Because single pressure chamber is independent at least partly, multi-cavity bearing is more insensitive to the defect in load-bearing surface (210).
Fig. 8 and 9 has shown porous restriction device hydrostatic bearing (800).In this embodiment, porous material (802) is used to substitute restriction choke and chamber.Because material is porous, the path that is used as in a large number restriction choke is provided for fluid and moves to the gap between bearing and stratum from source of supply.Therefore, this embodiment still can be considered to the extreme case of multi-cavity bearing.
With reference to Fig. 2 to 9, the gap (304) of the mechanical attributes of single cavity and multi-cavity bearing by the flow resistance of restriction choke (202), between the size of bearing bore and bearing oil sealing surface and surface determined.For DRILLING APPLICATION, there is the specific limited condition for the Machine Design of this equipment.If drilling mud is used as bearing fluid, system must be enough firm in to deal with given particle size.Preferably, particle size restriction can be regulated and be held by optional filtering slurry system.For reliable smooth operation, restriction choke and bearing oil sealing surface gap should be larger than particle size, with the possibility that reduces to block.In addition,, in order to reduce the possibility of bearing gasket apparent surface's friction, bearing clearance or flying height should be larger than the surface roughness of borehole wall.The design of hydrostatic bearing support equipment is essential consideration mud circulation also, so that: give some annular regions of slurry flows, for sending the rock landwaste from drill bit.Multi-cavity hydrostatic bearing may be not too responsive to the damage through consume/wearing and tearing, because if some bearing gasket materials are owing to falling with the fretting wear of borehole wall, unique effect will be slightly reducing in the length in restriction choke hole.Because this has linear effect by the flow resistance to restriction choke only, it is probably tolerated, and can not reduce the function of bearing.
Referring now to Fig. 1,10 He11，Dan chambeies and multi-cavity hydrostatic bearing can be used as portion of external surface and the partial stabilizer pipe nipple (102) of drill string.In showing for the sake of simplicity the example illustrated of single chamber bearing, the flowed through drilling mud (" central slurry flows ") at center (1102) of stabilizer of 4 bearing bores (1100) is fed to.Particularly, the restriction choke (1104) of this fluid in being integrated in stabilizer rib is fed in bearing bore.Or stratum (110) surface, inside or intermediate casing (1106) own provides bearing can move the stayed surface of dependence.Because stabilizer part will slide on the film of the pressurized mud being formed by bearing bore (1100) and bearing oil sealing surface (1108), rather than Guang metal surface, therefore the friction of sleeve pipe is reduced.As a result, to sleeve pipe and the chopped friction and wear of stabilizer, will reduce.In the stage of Production Regional probing place therein, this bearing is particularly useful, because now drill string is the longest and the most carefully locate at it, and needs the support of peak discharge and friction to reduce.
Referring now to Fig. 1 and Figure 12 ，Dan chamber and multi-cavity hydrostatic bearing, also can be used for reducing the friction of rotation in can control system.In this embodiment, this control member (108) comprises and can operate with by the kick-pad (kickpad) (1200) of the hydraulic actuation of the direction that pushes above regulation of BHA (104), i.e. " promotion drill bit " system.Each kick-pad (1200) is around hinge (1202) rotation, and has the motion of the definite angular range of arc in the plane of the axle perpendicular to being defined by BHA.This kick-pad is along with drill string rotating, and activates in the mode of coordinating, and enters conventionally the choice direction perpendicular to probing direction, to handle BHA to produce larger power relatively.Because when steering force is provided, bearing oil sealing surface (1204) and bearing bore (1206) keep compression fluid film between kick-pad and stratum, so the friction between stratum and kick-pad is reduced especially.As mentioned, for the compression fluid of operating fluid hydrostatic bearing can be with for example, for activating the identical fluid of kick-pad, central slurry flows.
Figure 13 and 14 has shown the control system of fluid pressure bias voltage.This fluid pressure bias voltage control system (1300) is used variable liquid static pressure, to handle BHA, rather than movable kick-pad.This control member (1302) does not move with respect to BHA.More properly, control member is hydrostatic bearing (multi-cavity bearing in the example shown in the example shown, but can use single chamber bearing), by the fluid pressure in the pressure chamber of change hydrostatic bearing, be applicable to relatively stratum (110) being applied to the power differing from one another.
By the bearing fluid through variable throttler unit (1304) is provided for bearing, can realize the fluid pressure of variation.In this example, variable throttler unit comprises restriction choke bar (1306), and it can be centrifuged and be placed on outer cylinder (1308) inside, has three radial bores that each fluid is connected to its corresponding bearing gasket.This radial bore is relative to each other equidistant.This restriction choke bar is directed along the axle parallel with the axle of being determined by outer cylinder, so that: bar and outer cylinder any depends on to the volume of the fluid fluid space between certain portions and along with the rotation variation of outer cylinder with respect to restriction choke bar.The difference of fluid fluid space volume causes the difference of flow resistance.In operation, when restriction choke rod unit is along with bias unit rotation, it is eccentric and static over the ground that the column part of variable throttler unit keeps.Due to this geometry, during each rotation, be applied to the flow resistance of each bearing level and smooth and continuously change, thereby more level and smooth manipulation is provided.By revising the round-shaped of cylindrical member, that is, the radius that makes cylinder is the applicable function of angle of circumference, and the adjusting of the non-linear or handling characteristic (dynamically) of resistance can be reduced or eliminate.In optional embodiment, use independent operation valve, rather than variable throttler unit.
Should be realized that: hydrostatic pressure bias voltage control system (1300) can be multi-form, can direction and linear manipulation.By move the position of restriction choke bar (1306) with respect to outer cylinder (1308) axle, realized multi-mode operation.When restriction choke is externally during the center of cylinder, when restriction choke bar and outer cylinder are when directed along relative axle, thereby flow resistance and bearing gasket pressure are identical on all bearings.As a result, identical pressure is applied to each load-bearing surface, and BHA will trend towards creeping into along linear path.When cylinder axis with respect to shown in during the axial displacement of restriction choke bar, the flow resistance of restriction choke (1402) is higher than the flow resistance of restriction choke (1401) and (1403).As a result, the line pressure that leads to bearing gasket of being supplied by restriction choke (1402) is lower than the pressure relevant with (1403) to restriction choke (1401).This causes adopting with the similar mode of describing unbalance for the power on the load-bearing surface of non-linear manipulation in the above.In order to keep balance, bias unit by drilling well inside along the direction displacement of minimum pressure bearing gasket, in this case, be the bearing gasket relevant to restriction choke (1402).Similar this system can produce strong biasing force, presents extremely low friction and wear simultaneously.
In the example shown, fluid pressure bias unit shows to have three bearing gaskets and restriction choke unit, No. 3.Yet this bias unit can have the bearing gasket of arbitrary number, including, but not limited to single bearing gasket with over three bearing gaskets, for more level and smooth circumference, shift.Can use the continuous system that there is no special pad.
Figure 15 and 16 has shown to have operation as the drill bit (1500) in the fluid pressure chamber (1502) of bias voltage controls.This operates in the identical mode of fluid pressure deflection operating system essence with Figure 13 and 14.Yet at this embodiment, fluid pressure chamber is arranged on drill bit itself, but not higher on BHA.This fluid pressure chamber is used mud pressure to produce lift in the selected side of drill bit, with the direction along expectation, promotes drill bit.Pressurized slurry fluid film between pressure chamber and stratum can be with very little or support larger power without wearing and tearing.In the embodiment shown, this drill bit comprises three pressure chambers (1502), yet can use an only pressure chamber.Each pressure chamber is equipped with feed conduit (1504), for by mud introduction chamber.By by single, static mud supply line (1506) is positioned near drill bit over the ground, can realize simple and firm control system so that: when bit, supply line is given each feed conduit supply pressure mud in order.Because mud supply line is geostationary, drill bit leaves operation the flow direction of mud supply line.By the rotation of mud supply line is synchronizeed with bit, can realize linearity and creep into.Because for example press mold is wetting, this mud operating fluid hydrostatic bearing can provide wetting effect in addition, causes more level and smooth drill-well operation.The parts that cut away (1508) provide path for having the slurry flows of landwaste.
Although the present invention is described by above-mentioned exemplary embodiments, those of ordinary skill in the art will appreciate that: in the situation that not deviating from inventive concept disclosed herein, can carry out the modification of illustrated embodiment and change.In addition, although described preferred embodiment in conjunction with multiple display structure, person of skill in the art will appreciate that: this system can be used multiple concrete outcome to realize.Correspondingly, except the scope and spirit of claims, the present invention is hard-core.
Claims (26)
1. for being conducive to the device of drilling operation, wherein:
Described device comprises the drill string parts that are applicable to inserting drilling well, and described drilling well is limited with load-bearing surface;
Described drill string parts comprise the cavity that can transport pressure fluid, and at least one hydrostatic bearing, and this hydrostatic bearing can be used the gap of pressure fluid between hydrostatic bearing and described load-bearing surface that fluid film is provided.
2. device according to claim 1, wherein: drill string parts comprise drilling rod and stabilizer pipe nipple, stabilizer pipe nipple has at least one parts, when rotation, described at least one parts are determined the diameter that is greater than drill pipe diameter, and wherein: hydrostatic bearing is arranged on stabilizer pipe nipple parts.
3. device according to claim 1, wherein: hydrostatic bearing comprises single pressure chamber.
4. device according to claim 1, wherein: hydrostatic bearing comprises a plurality of pressure chambers.
5. device according to claim 1, wherein: pressure fluid is provided by central slurry flows.
6. for being conducive to the equipment of the probing handled of drilling well, described drilling well is limited with load-bearing surface, and described equipment comprises:
Bottom drill tool assembly, described bottom drill tool assembly comprises: drill bit and the main body with the cavity that can transport pressure fluid, described bottom drill tool assembly comprises: at least one hydrostatic bearing, this hydrostatic bearing part can be used the gap of pressure fluid between hydrostatic bearing and load-bearing surface that fluid film is provided.
7. equipment according to claim 6, also comprises: with respect to mobilizable at least one kick-pad of bottom drill tool module body, hydrostatic bearing is arranged in kick-pad.
8. equipment according to claim 6, also comprises: at least one control member, comprising: described hydrostatic bearing; With for changing selectively the device of pressure in the chamber of bearing.
9. equipment according to claim 8, wherein: pressure change device comprises variable throttler, described variable throttler has the externally restriction choke parts of cylinder interior displacement prejudicially, and described outer cylinder has the radial bore that is fluidly connected to bearing.
10. equipment according to claim 9, comprising: a plurality of bearings, and wherein: restriction choke parts are applicable to by directed along the common axis with outer cylinder selectively, so that identical with respect to the flow resistance of each bearing.
11. equipment according to claim 6, wherein: hydrostatic bearing comprises single pressure chamber.
12. equipment according to claim 6, wherein: hydrostatic bearing comprises a plurality of pressure chambers.
13. equipment according to claim 6, wherein: pressure fluid is provided by central slurry flows.
14. 1 kinds of methods that are conducive to drilling operation, comprise the following steps:
The drill string parts that are applicable to inserting drilling well are provided, and described drill string parts comprise the cavity that can transport pressure fluid, and described drilling well is limited with load-bearing surface;
By at least some in pressure fluid are directed to hydrostatic bearing, the gap between load-bearing surface and at least one hydrostatic bearing of drill string parts provides fluid film.
15. methods according to claim 14, wherein: drill string parts comprise drilling rod and stabilizer pipe nipple, and stabilizer pipe nipple has a plurality of parts, when rotation, described parts are determined the diameter of the diameter that is greater than drilling rod, and wherein hydrostatic bearing is arranged on stabilizer pipe nipple parts.
16. methods according to claim 14, further comprising the steps of: to utilize hydrostatic bearing to form single pressure chamber.
17. methods according to claim 14, further comprising the steps of: to utilize hydrostatic bearing to form a plurality of pressure chambers.
18. methods according to claim 14, further comprising the steps of: by central slurry flows, to provide compression fluid.
19. 1 kinds of methods that are conducive to the probing handled of drilling well, described drilling well is limited with load-bearing surface, said method comprising the steps of:
Bottom drill tool assembly is provided, and described bottom drill tool assembly comprises drill bit and the main body with the cavity that can transport pressure fluid, and bottom drill tool assembly comprises at least one hydrostatic bearing;
Use pressure fluid to provide fluid film with the gap between described hydrostatic bearing and described load-bearing surface.
20. methods according to claim 19, further comprising the steps of: with respect to bottom drill tool module body, movably at least one kick-pad is to handle drill bit in use, and hydrostatic bearing is arranged in kick-pad.
21. methods according to claim 19, also comprise: comprise at least one control member of hydrostatic bearing, and comprise step: change selectively the pressure in the chamber of bearing.
22. methods according to claim 21, also comprise: variable throttler, has restriction choke parts and have the outer cylinder that fluid is connected to the radial bore of bearing, and comprise step: make the externally displacement prejudicially in cylinder of restriction choke parts.
23. methods according to claim 22, comprise a plurality of bearings, and comprise the following steps: along with the common axis of outer cylinder directed restriction choke parts selectively so that identical with respect to the flow resistance of each bearing.
24. methods according to claim 19, further comprising the steps of: to utilize hydrostatic bearing to form single pressure chamber.
25. methods according to claim 19, further comprising the steps of: to utilize hydrostatic bearing to form a plurality of pressure chambers.
26. methods according to claim 19, further comprising the steps of: by central slurry flows, to provide pressure fluid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810008511.2A CN101492999B (en) | 2008-01-23 | 2008-01-23 | Used of downhole fluid static pressure bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810008511.2A CN101492999B (en) | 2008-01-23 | 2008-01-23 | Used of downhole fluid static pressure bearing |
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| CN101492999A CN101492999A (en) | 2009-07-29 |
| CN101492999B true CN101492999B (en) | 2014-01-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2775431B1 (en) * | 1998-03-02 | 2000-08-04 | Innothera Topic Int | METHOD AND DEVICE FOR THREADING ONTO A MEMBER A TUBULAR COMPRESSIVE ORTHESIS SUCH AS A BOTTOM, STICKY OR SOCKS IN KNITTED ELASTIC TEXTILE MATERIAL |
| US6361217B1 (en) * | 1999-06-22 | 2002-03-26 | Thomas R. Beasley | High capacity thrust bearing |
| US6662644B1 (en) * | 2002-06-28 | 2003-12-16 | Edm Systems Usa | Formation fluid sampling and hydraulic testing tool |
| US6986282B2 (en) * | 2003-02-18 | 2006-01-17 | Schlumberger Technology Corporation | Method and apparatus for determining downhole pressures during a drilling operation |
| US7339494B2 (en) * | 2004-07-01 | 2008-03-04 | Halliburton Energy Services, Inc. | Acoustic telemetry transceiver |
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