CN102296928A - Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig - Google Patents

Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig Download PDF

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Publication number
CN102296928A
CN102296928A CN2011102619173A CN201110261917A CN102296928A CN 102296928 A CN102296928 A CN 102296928A CN 2011102619173 A CN2011102619173 A CN 2011102619173A CN 201110261917 A CN201110261917 A CN 201110261917A CN 102296928 A CN102296928 A CN 102296928A
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CN
China
Prior art keywords
seal
assembly
transmission shaft
sealing
piston
Prior art date
Application number
CN2011102619173A
Other languages
Chinese (zh)
Inventor
祝效华
石昌帅
李佳南
Original Assignee
西南石油大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西南石油大学 filed Critical 西南石油大学
Priority to CN2011102619173A priority Critical patent/CN102296928A/en
Publication of CN102296928A publication Critical patent/CN102296928A/en

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Abstract

The invention relates to a transmission shaft assembly of a spiral drilling rig used for petroleum and natural gas drilling and capable of maintaining pressure balance of an oil sealing cavity. The invention adopts the technical scheme that: the transmission shaft assembly of the oil sealing cavity pressure balancing spiral drilling rig comprises an upper sealing assembly, a middle sealing assembly, a lower sealing assembly and the like; lubricating oil is injected into a chamber between the upper sealing assembly and the middle sealing assembly and a chamber between the middle sealing assembly and the lower sealing assembly; the upper sealing assembly comprises an annular cavity, a piston cylinder body, an upper sealing check valve and the like; the lower sealing assembly comprises a runner, a piston cavity, a piston, a lower sealing check valve and the like; and balance of pressure in the sealing cavity and pressure of external drilling fluid is controlled by up-and-down sliding of the piston cylinder body and the piston and opening and closing of the upper sealing check valve and the lower sealing check valve. The transmission shaft assembly has the advantages of good sealing property, long service life, high temperature and high pressure resistance, small friction coefficient, simple structure and the like, and can be used in gas drilling and slurry medium drilling of high-temperature strength vibration.

Description

A kind of oil seal cavity pressure balance screw drill transmission shaft assembly
Technical field
The present invention relates to a kind of oil seal screw drill transmission shaft assembly that is used for oil and gas well drilling, be particularly suitable for the mud medium deep-well of gas base flow body drilling technology and high temperature strong vibration, the oil seal cavity pressure balance screw drill transmission shaft assembly that the ultradeep well drilling process uses.
Background technology
One of a kind of well dynamic instrument that helicoid hydraulic motor uses when being oil drilling or workover treatment, and driving-shaft assembly is one of four big critical pieces of helicoid hydraulic motor, also be one of parts of the easiest inefficacy, its effect is that the output torque of motor and rotating speed are passed to drill bit, bears the axial and radial load that produces in the drilling process simultaneously.Driving-shaft assembly comprises parts such as power transmission shaft, transmission shaft shell, journal bearing group, thrust bearings.The bid operation of oil gas field both at home and abroad in recent years; the Party A requires to use air drilling; air drilling has and significantly improves rate of penetration, effectively finds and protect technical advantage such as oil-gas Layer, but it is particularly had higher requirement to helicoid hydraulic motor to down-hole equipment simultaneously.Helicoid hydraulic motor conventional in air drilling can't use owing to lacking enough fluid lubrications; The oil seal transmission shaft helicoid hydraulic motor that occurs also can't stop the intrusion of gas base circulatory mediator (pure gas, gas-solid, gas-solid liquid) preferably through field experiment in recent years, application life is low, usually use and promptly lost efficacy in 40~50 hours, this not only causes frequently making a trip, and the stuck easy initiation drilling failure of bearing, also significantly reduce drilling efficiency thereby bring than the large economy loss.
When the domestic existing sealed device for drive-shaft is used for the deep-well mud drilling at present, because the self seal ability causes result of use poor, application life is short, can't satisfy instructions for use, this in addition limited the band application of sealing device helicoid hydraulic motor in deep-well.
Summary of the invention
The objective of the invention is: for a kind of good seal performance, long, the wear-resisting screw drill transmission shaft assembly that undermines high temperature high voltage resistant of life-span are provided, prolong the application life of screw drill transmission shaft under bad working environments, specially propose a kind of oil seal cavity pressure balance screw drill transmission shaft assembly.
In order to achieve the above object, the present invention solves the technical scheme that this technical problem adopts: a kind of oil seal cavity pressure balance screw drill transmission shaft assembly, be made up of housing, power transmission shaft, last seal assembly, last journal bearing group, thrust bearings, intermediate seal assembly, lower radial bearing group, support set, lower seal assembly and lower end screw thread etc., its architectural feature is: housing and power transmission shaft cooperate formation annular space cavity volume; Last seal assembly is installed in the annular space cavity volume, journal bearing group, thrust bearings, support set and lower radial bearing group is installed successively below the last seal assembly; The intermediate seal assembly is installed in lower radial bearing group upper end, and the lower seal assembly is installed in lower radial bearing group lower end; The lower end drill bit that is threaded.
Last seal assembly by sleeve, piston/cylinder, bearing, static seal circle, dynamic seal ring, on seal check (non-return) valve etc. and form; Sleeve outer surface contacts with piston/cylinder, and inner surface contacts with power transmission shaft, contact surface plating one deck chromium of sleeve and piston/cylinder, and its thickness is 0.05~0.20mm, to increase the Corrosion Protection and the abrasion resistance of contact surface; The sleeve endoporus is installed 2~4 groups of static seal circles, cooperates with power transmission shaft to form static seal; The piston/cylinder endoporus is equipped with two groups of dynamic seal rings and one group of bearing, cooperates with sleeve to form movable sealing, and external surface is installed 2~4 groups of static seal circles, cooperates with housing to form static seal; There is the sealing of going up check (non-return) valve piston/cylinder inside, can be communicated with the annular space cavity volume at two ends.
The intermediate seal assembly is made up of dynamic seal ring, static seal circle etc.; Lower radial bearing group upper end endoporus is installed dynamic seal ring, cooperates with support set to form movable sealing; Lower radial bearing group external surface is installed 1~3 group of static seal circle, cooperates with housing to form static seal; Support set upper end endoporus is installed 1~2 group of static seal circle, cooperates with power transmission shaft to form static seal.
The lower seal assembly is made up of runner, plunger shaft, piston, pipe close, lower seal check (non-return) valve, dynamic seal ring etc.; Runner is communicated with gap and plunger shaft in the lower radial bearing group in lower radial bearing group inside; Piston is installed in the plunger shaft, and plunger shaft lower end port is installed pipe close; There is the lower seal check (non-return) valve lower seal assembly inside; Lower seal assembly endoporus is installed two groups of dynamic seal rings, cooperates with power transmission shaft to form movable sealing.
Dynamic seal ring has hydrodynamic lubrication limit and an isolated border point, straight that a plurality of waveforms are formed; Sealing ring is installed in the seal groove, and the waveform limit contacts with the axle surface simultaneously with straight flange, forms special sealing " lip ".
The present invention compared with prior art, the beneficial effect that has is: (1) sealing device contact surface of the present invention cooperates by bearing, has that good seal performance, life-span are long, high temperature high voltage resistant and a little effect of friction factor; (2) the annular seal space pressure at two ends keeps balance, has guaranteed sealing effectiveness, long service life; (3) dynamic seal ring of Ying Yonging has sealing contact zone high lubricating effect, sealing load height, wearing and tearing are low, moment of torsion is little and frictional heat characteristics such as less; (4) the present invention is simple in structure, cost is low, can satisfy the mud drilling construction needs under body drilling well of gas base flow and the bad working environments, can be used in the mud medium drilling well of body drilling well of gas base flow and high temperature strong vibration.
Description of drawings
Fig. 1 is the structural representation of a kind of oil seal cavity pressure of the present invention balance screw drill transmission shaft assembly.
Fig. 2 is the structural representation of seal assembly on the driving-shaft assembly of the present invention.
Fig. 3 is the structural representation of driving-shaft assembly intermediate seal assembly of the present invention.
Fig. 4 is the structural representation of driving-shaft assembly lower seal assembly of the present invention.
Fig. 5 is the cross-sectional view of driving-shaft assembly dynamic seal ring 18 of the present invention, dynamic seal ring 21 and dynamic seal ring 29.
Among the figure: 1. housing, 2. power transmission shaft is 3. gone up seal assembly, 4. goes up the journal bearing group, 5. thrust bearings, 6. intermediate seal assembly, 7. lower radial bearing group, 8. housing shoulder end face, 9. annular space cavity volume, 10. support set, 11. the lower seal assembly, 12. lower end screw threads, 13. sleeves, 14. piston/cylinder, 15. bearings, 16. static seal circles, 17. dynamic seal ring, 18. dynamic seal rings seal check (non-return) valve on 19., 20. the static seal circle, 21. dynamic seal rings, 22. static seal circles, 23. the static seal circle, 24. runners, 25. plunger shaft, 26. piston, 27. pipe closes, 28. lower seal check (non-return) valves, 29. dynamic seal ring, 30. dynamic seal rings, 31. annular space cavity volumes.
The specific embodiment
As shown in Figure 1, a kind of oil seal cavity pressure of the present invention balance screw drill transmission shaft assembly, be made up of housing 1, power transmission shaft 2, last seal assembly 3, last journal bearing group 4, thrust bearings 5, intermediate seal assembly 6, lower radial bearing group 7, support set 10, lower seal assembly 11 and lower end screw thread 12 etc., its architectural feature is: housing 1 and power transmission shaft 2 cooperate formation annular space cavity volume 9 and annular space cavity volumes 31; Last seal assembly 3 is installed between annular space cavity volume 9 and the annular space cavity volume 31, journal bearing group 4, thrust bearings 5, support set 10 and lower radial bearing group 7 is installed successively below the last seal assembly 3; Intermediate seal assembly 6 is installed in lower radial bearing group 7 upper ends, and lower seal assembly 11 is installed in lower radial bearing group 7 lower ends; Lower end screw thread 12 connects drill bit.
As shown in Figure 2, last seal assembly 3 by sleeve 13, piston/cylinder 14, bearing 15, static seal circle 16, dynamic seal ring 17, on seal check (non-return) valve 19 and static seal circle 20 etc. and form; Sleeve 13 external surfaces contact with piston/cylinder 14, and inner surface contacts with power transmission shaft 2, and sleeve 13 plates one deck chromium with the contact surface of piston/cylinder 14, and its thickness is 0.05~0.20mm, to increase the Corrosion Protection and the abrasion resistance of contact surface; Sleeve 13 endoporus are installed 2~4 groups of static seal circles 16, cooperate with power transmission shaft 2 to form static seal; Piston/cylinder 14 endoporus are equipped with dynamic seal ring 17, dynamic seal ring 18 and bearing 15, cooperate the formation movable sealing with sleeve 13, external surface is installed 2~4 groups of static seal circles 20, cooperate the formation static seal with housing 1, bearing 15 can adopt needle bearing, deep groove ball bearing, angular contact bearing or thrust bearing; There is the sealing of going up check (non-return) valve 19 piston/cylinder 14 inside, can be communicated with annular space cavity volume 9 and annular space cavity volume 31; Piston/cylinder 14 upper ends are the drilling fluid in the annular space cavity volume 9, the lower end is the lubrication oil in the annular space cavity volume 31, when piston/cylinder when there is pressure reduction both sides about in the of 14, piston/cylinder 14 will slide to the less direction of pressure, to guarantee the pressure at both sides balance, piston/cylinder 14 upwards slides spacing by housing shoulder end face 8; When the pressure in the annular space cavity volume 9 during less than the pressure in the annular space cavity volume 31, and when pressure reduction reaches the limit value of sealing check (non-return) valve 19, pressure reduction promotes to go up sealing check (non-return) valve 19 and opens, lubrication oil in the annular space cavity volume 31 will be from the drilling fluid in last sealing check (non-return) valve 19 is leaked to annular space cavity volume 9, drop to until piston/cylinder 14 both sides pressure reduction below the limit value of sealing check (non-return) valve 19, on seal check (non-return) valve 19 and just can close.
As shown in Figure 3, intermediate seal assembly 6 is made up of dynamic seal ring 21, static seal circle 22 and static seal circle 23; Lower radial bearing group 7 upper end endoporus are installed dynamic seal ring 21, cooperate with support set 10 to form movable sealing; Lower radial bearing group 7 external surfaces are installed 1~3 group of static seal circle 22, cooperate with housing 1 to form static seal; Support set 10 upper end endoporus are installed 1~2 group of static seal circle 23, cooperate with power transmission shaft 2 to form static seal; Intermediate seal assembly 6 both sides are lubrication oil.
As shown in Figure 4, lower seal assembly 11 is made up of runner 24, plunger shaft 25, piston 26, pipe close 27, lower seal check (non-return) valve 28, dynamic seal ring 29 and dynamic seal ring 30 etc.; Runner 24 is communicated with gap and plunger shaft 25 in the lower radial bearing group 7 in lower radial bearing group 7 inside; Piston 26 is installed in the plunger shaft 25, and plunger shaft 25 lower end ports are installed pipe close 27; There is lower seal check (non-return) valve 28 lower seal assembly 11 inside; Lower seal assembly 11 endoporus are installed dynamic seal ring 29 and dynamic seal ring 30, cooperate with power transmission shaft 2 to form movable sealing; Piston 26 upper ends in the plunger shaft 25 are lubrication oil, and the lower end is a drill bit ejection drilling fluid, and when piston when there is pressure reduction both sides 26 about, piston 26 will slide up and down in plunger shaft 25, and with assurance pressure at both sides balance, piston 26 is spacing to lower slider tube plug 27; When piston 26 upper end lubricating oil pressures greater than the lower end drilling liquid pressure, and when pressure reduction reaches the limit value of lower seal check (non-return) valve 28, pressure reduction promotes lower seal check (non-return) valve 28 and opens, lubrication oil in the annular seal space will be leaked to the drilling fluid from lower seal check (non-return) valve 28, drop to below the limit value of lower seal check (non-return) valve 28 until piston 26 both sides pressure reduction, lower seal check (non-return) valve 28 just can cut out.
Last sealing check (non-return) valve 19 and lower seal check (non-return) valve 28 have one to limit pressure difference, when having only the pressure reduction of annular seal space lubrication oil and outside drilling fluid to surpass this to limit pressure difference, pressure reduction just promotes check (non-return) valve and opens, and can only be flow of lubricant to the drilling fluid side, drilling fluid can not flow to the lubrication oil side.
Because there is a pressure reduction in the drilling fluid of drilling fluid and the ejection of drill bit place in the piston/cylinder 14 upper end annular space cavity volumes 9, so this pressure reduction is born in intermediate seal assembly 6 both sides.
As shown in Figure 5, dynamic seal ring 18, dynamic seal ring 21 and dynamic seal ring 29 have hydrodynamic lubrication limit and an isolated border point, straight that a plurality of waveforms are formed; Sealing ring is installed in the seal groove, and the waveform limit contacts with the axle surface simultaneously with straight flange, forms special sealing " lip "; In medium one side, bellows seal limit velocity component produces the hydrodynamic lubrication effect, makes whole sealing contact zone all be in perfect fluid dynamic lubrication state under the stabilized speed.

Claims (6)

1. oil seal cavity pressure balance screw drill transmission shaft assembly, be made up of housing (1), power transmission shaft (2), last seal assembly (3), last journal bearing group (4), thrust bearings (5), intermediate seal assembly (6), lower radial bearing group (7), support set (10), lower seal assembly (11) and lower end screw thread (12) etc., its architectural feature is: housing (1) and power transmission shaft (2) cooperate formation annular space cavity volume (9) and annular space cavity volume (31); Last seal assembly (3) is installed between annular space cavity volume (9) and the annular space cavity volume (31), journal bearing group (4), thrust bearings (5), support set (10) and lower radial bearing group (7) is installed successively below the last seal assembly (3); Intermediate seal assembly (6) is installed in lower radial bearing group (7) upper end, and lower seal assembly (11) is installed in lower radial bearing group (7) lower end; Lower end screw thread (12) connects drill bit.
2. oil seal cavity pressure balance screw drill transmission shaft assembly according to claim 1 is characterized in that: go up seal assembly (3) by sleeve (13), piston/cylinder (14), bearing (15), static seal circle (16), dynamic seal ring (17), on seal check (non-return) valve (19) and static seal circle (20) is formed; Sleeve (13) external surface contacts with piston/cylinder (14), and inner surface contacts with power transmission shaft (2), and sleeve (13) endoporus is installed 2~4 groups of static seal circles (16), cooperates with power transmission shaft (2) to form static seal; Piston/cylinder (14) endoporus is equipped with dynamic seal ring (17), dynamic seal ring (18) and bearing (15), and external surface is installed 2~4 groups of static seal circles (20); There is the sealing of going up check (non-return) valve (19) piston/cylinder (14) inside.
3. oil seal cavity pressure balance screw drill transmission shaft assembly according to claim 1, it is characterized in that: intermediate seal assembly (6) is made up of dynamic seal ring (21), static seal circle (22) and static seal circle (23); Lower radial bearing group (7) upper end endoporus is installed dynamic seal ring (21), cooperates with support set (10) to form movable sealing; Lower radial bearing group (7) external surface is installed 1~3 group of static seal circle (22), cooperates with housing (1); Support set (10) upper end endoporus is installed 1~2 group of static seal circle (23), cooperates with power transmission shaft (2).
4. oil seal cavity pressure balance screw drill transmission shaft assembly according to claim 1, it is characterized in that: lower seal assembly (11) is made up of runner (24), plunger shaft (25), piston (26), pipe close (27), lower seal check (non-return) valve (28), dynamic seal ring (29) and dynamic seal ring (30) etc.; Runner (24) is communicated with gap and plunger shaft (25) in the lower radial bearing group (7) in lower radial bearing group (7) inside; Piston (26) is installed in the plunger shaft (25), and plunger shaft (25) lower end port is installed pipe close (27); There is lower seal check (non-return) valve (28) lower seal assembly (11) inside; Lower seal assembly (11) endoporus is installed dynamic seal ring (29) and dynamic seal ring (30), cooperates with power transmission shaft (2) to form movable sealing.
5. the sleeve of oil seal cavity pressure balance screw drill transmission shaft assembly according to claim 2, it is characterized in that: sleeve (13) plates one deck chromium with the contact surface of piston/cylinder (14), its thickness is 0.05~0.20mm, to increase the Corrosion Protection and the abrasion resistance of contact surface.
6. according to the dynamic seal ring of claim 2, claim 3 and the described oil seal cavity pressure of claim 4 balance screw drill transmission shaft assembly, it is characterized in that: dynamic seal ring (18), dynamic seal ring (21) and dynamic seal ring (29) have hydrodynamic lubrication limit and an isolated border point, straight that a plurality of waveforms are formed.
CN2011102619173A 2011-09-06 2011-09-06 Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig CN102296928A (en)

Priority Applications (1)

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CN2011102619173A CN102296928A (en) 2011-09-06 2011-09-06 Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103321568A (en) * 2013-07-17 2013-09-25 西南石油大学 Long-service-life high-performance screw drill
CN103851324A (en) * 2012-12-03 2014-06-11 中国石油天然气集团公司 Oil seal structure of underground power tool
CN104776223A (en) * 2015-03-24 2015-07-15 上海上探工程机械有限公司 Device with dynamic pressure-retained sealing function
CN106351948A (en) * 2016-08-29 2017-01-25 中石化石油机械股份有限公司江钻分公司 A undermine sealing and righting thrust bearing system
CN110284846A (en) * 2019-07-23 2019-09-27 建湖县帅牛机械有限公司 A kind of oil-well drilling equipment convenient for adjusting mud pressure
CN110360398A (en) * 2019-07-19 2019-10-22 朱金强 A kind of fire coupling

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Publication number Priority date Publication date Assignee Title
US3894818A (en) * 1973-04-27 1975-07-15 Smith International In-hole motors
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US5217080A (en) * 1991-01-08 1993-06-08 Wenzel Kenneth H Sealing system for a sealed bearing assembly
CN2510674Y (en) * 2001-10-19 2002-09-11 大港油田集团有限责任公司 Screw drilling tool drive shaft sealing device
CN2551753Y (en) * 2002-07-10 2003-05-21 石油大学(北京) Oil Storage compensation simple sealed drive shaft with multiple rows of thrust ball bearing
CN101215954A (en) * 2008-01-09 2008-07-09 西南石油大学 High sealing property screw drill driving-shaft assembly
US20100326730A1 (en) * 2009-06-25 2010-12-30 National Oilwell Varco, L.P. Sealing System and Bi-Directional Thrust Bearing Arrangement for a Downhole Motor
CN202227977U (en) * 2011-09-06 2012-05-23 西南石油大学 Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894818A (en) * 1973-04-27 1975-07-15 Smith International In-hole motors
US5217080A (en) * 1991-01-08 1993-06-08 Wenzel Kenneth H Sealing system for a sealed bearing assembly
US5195754A (en) * 1991-05-20 1993-03-23 Kalsi Engineering, Inc. Laterally translating seal carrier for a drilling mud motor sealed bearing assembly
CN2510674Y (en) * 2001-10-19 2002-09-11 大港油田集团有限责任公司 Screw drilling tool drive shaft sealing device
CN2551753Y (en) * 2002-07-10 2003-05-21 石油大学(北京) Oil Storage compensation simple sealed drive shaft with multiple rows of thrust ball bearing
CN101215954A (en) * 2008-01-09 2008-07-09 西南石油大学 High sealing property screw drill driving-shaft assembly
US20100326730A1 (en) * 2009-06-25 2010-12-30 National Oilwell Varco, L.P. Sealing System and Bi-Directional Thrust Bearing Arrangement for a Downhole Motor
CN202227977U (en) * 2011-09-06 2012-05-23 西南石油大学 Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103851324A (en) * 2012-12-03 2014-06-11 中国石油天然气集团公司 Oil seal structure of underground power tool
CN103851324B (en) * 2012-12-03 2016-08-03 中国石油天然气集团公司 The oil seal structure of well dynamic instrument
CN103321568A (en) * 2013-07-17 2013-09-25 西南石油大学 Long-service-life high-performance screw drill
CN103321568B (en) * 2013-07-17 2015-07-01 西南石油大学 Long-service-life high-performance screw drill
CN104776223A (en) * 2015-03-24 2015-07-15 上海上探工程机械有限公司 Device with dynamic pressure-retained sealing function
CN106351948A (en) * 2016-08-29 2017-01-25 中石化石油机械股份有限公司江钻分公司 A undermine sealing and righting thrust bearing system
CN110360398A (en) * 2019-07-19 2019-10-22 朱金强 A kind of fire coupling
CN110284846A (en) * 2019-07-23 2019-09-27 建湖县帅牛机械有限公司 A kind of oil-well drilling equipment convenient for adjusting mud pressure

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