CN202227977U - Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity - Google Patents
Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity Download PDFInfo
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- CN202227977U CN202227977U CN2011203323016U CN201120332301U CN202227977U CN 202227977 U CN202227977 U CN 202227977U CN 2011203323016 U CN2011203323016 U CN 2011203323016U CN 201120332301 U CN201120332301 U CN 201120332301U CN 202227977 U CN202227977 U CN 202227977U
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Abstract
The utility model relates to a transmission shaft assembly of a screw drilling tool for balancing pressure of an oil seal cavity, which is used for an oil and gas bored well. The technical scheme includes that the transmission shaft assembly of the screw drilling tool for balancing the pressure of the oil seal cavity comprises an upper sealing assembly, a middle sealing assembly, a lower sealing assembly and the like. Lubricating oil is filled in a cavity arranged between the upper sealing assembly and the middle sealing assembly and a cavity arranged between the middle sealing assembly and the lower sealing assembly. The upper sealing assembly comprises an annular accommodating cavity, a piston cylinder body, an upper sealing check valve and the like. The lower sealing assembly comprises a flow channel, a piston cavity, a piston, a lower sealing check valve and the like. The balance between pressure in the seal cavity and a hydraulic pressure of the external bored well is controlled by vertical 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 of the screw drilling tool for balancing the pressure of the oil seal cavity has the advantages of being good in sealing performance, long in service life, resistant to high temperature and high pressure, small in friction coefficient, simple in structure and the like, and can be used in a gas bored well and a high-temperature and high-vibration mud medium bored well.
Description
Technical field
The utility model relates to a kind of oil seal screw drill transmission shaft assembly that is used for oil and gas well drilling, is 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 in recent years also can't stop the intrusion of gas base circulatory mediator (pure gas, gas-solid, gas-solid liquid) preferably through field experiment; 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 reduces drilling efficiency thereby bring than the large economy loss.
When the domestic existing sealed device for drive-shaft is used for the deep-well DWM 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 purpose of the utility model 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 utility model solves the technical scheme that this technical problem adopted: 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, forms static seal with shell; 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, forms static seal with shell; 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 inner in the lower radial bearing group, is communicated with gap and plunger shaft in the lower radial bearing group; 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 with straight flange simultaneously, forms special sealing " lip ".
The utility model compared with prior art, the beneficial effect that has is: (1) the utility model sealing device contact surface leans on bearing to cooperate, and 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 using has sealing contact zone high lubricating effect, sealing load is high, wearing and tearing are low, moment of torsion is little and frictional heat characteristics such as less; (4) the utility model is simple in structure, cost is low, can satisfy the DWM 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 utility model balance screw drill transmission shaft assembly.
Fig. 2 is the structural representation of seal assembly on the utility model driving-shaft assembly.
Fig. 3 is the structural representation of the utility model driving-shaft assembly intermediate seal assembly.
Fig. 4 is the structural representation of the utility model driving-shaft assembly lower seal assembly.
Fig. 5 is the cross-sectional view of the utility model driving-shaft assembly dynamic seal ring 18, 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. lower seal assemblies, 12. lower end screw threads, 13. sleeves; 14. piston/cylinder, 15. bearings, 16. static seal circles, 17. dynamic seal rings, 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. static seal circles, 24. runners, 25. plunger shaft; 26. piston, 27. pipe closes, 28. lower seal check (non-return) valves, 29. dynamic seal rings, 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 utility model balance screw drill transmission shaft assembly; By housing 1, power transmission shaft 2, go up seal assembly 3, go up 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. and form, its architectural feature is: housing 1 cooperates with power transmission shaft 2 and forms annular space cavity volumes 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, and to guarantee the pressure at both sides balance, piston/cylinder 14 upwards slides and leans on housing shoulder end face 8 spacing; 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 drop to below the limit value that seals check (non-return) valve 19 until piston/cylinder 14 both sides pressure reduction from the drilling fluid in last sealing check (non-return) valve 19 is leaked to annular space cavity volume 9, 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 to guarantee the pressure at both sides balance, piston 26 is spacing by pipe close 27 to lower slider; 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, and lower seal check (non-return) valve 28 just can cut out.
Last sealing check (non-return) valve 19 has one to limit pressure difference with lower seal check (non-return) valve 28; 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 with straight flange simultaneously, 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 (5)
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. 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203323016U CN202227977U (en) | 2011-09-06 | 2011-09-06 | Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203323016U CN202227977U (en) | 2011-09-06 | 2011-09-06 | Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202227977U true CN202227977U (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203323016U Expired - Lifetime CN202227977U (en) | 2011-09-06 | 2011-09-06 | Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202227977U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296928A (en) * | 2011-09-06 | 2011-12-28 | 西南石油大学 | Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig |
| CN103615194A (en) * | 2013-12-03 | 2014-03-05 | 东营博深石油机械有限责任公司 | Oil seal spindle assembly of screw drill |
| CN104196440A (en) * | 2014-07-11 | 2014-12-10 | 江汉石油钻头股份有限公司 | Sealing-type screw drill transmission shaft assembly |
| CN104278948A (en) * | 2014-09-28 | 2015-01-14 | 扬州天业石油机械有限公司 | Transmission shaft assembly of positive displacement motor drill |
| 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 |
-
2011
- 2011-09-06 CN CN2011203323016U patent/CN202227977U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296928A (en) * | 2011-09-06 | 2011-12-28 | 西南石油大学 | Transmission shaft assembly of oil sealing cavity pressure balancing spiral drilling rig |
| CN103615194A (en) * | 2013-12-03 | 2014-03-05 | 东营博深石油机械有限责任公司 | Oil seal spindle assembly of screw drill |
| CN104196440A (en) * | 2014-07-11 | 2014-12-10 | 江汉石油钻头股份有限公司 | Sealing-type screw drill transmission shaft assembly |
| CN104278948A (en) * | 2014-09-28 | 2015-01-14 | 扬州天业石油机械有限公司 | Transmission shaft assembly of positive displacement motor drill |
| CN104278948B (en) * | 2014-09-28 | 2016-07-06 | 扬州天业石油机械有限公司 | A kind of screw drill transmission shaft assembly |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120523 |
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| CX01 | Expiry of patent term |