CN202227977U

CN202227977U - Transmission shaft assembly of screw drilling tool for balancing pressure of oil seal cavity

Info

Publication number: CN202227977U
Application number: CN2011203323016U
Authority: CN
Inventors: 祝效华; 石昌帅; 李佳南
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2011-09-06
Filing date: 2011-09-06
Publication date: 2012-05-23
Anticipated expiration: 2021-09-06

Abstract

The utility model relates to an oil seal chamber pressure balance screw drill drive shaft assembly used for oil and gas drilling. Its technical proposal is: oil seal chamber pressure balance screw drilling tool transmission shaft assembly includes upper seal assembly, intermediate seal assembly and lower seal assembly, etc.; upper seal assembly and intermediate seal assembly, intermediate seal assembly and lower seal assembly The cavity between the sealing assemblies is filled with lubricating oil; the upper sealing assembly includes the annular cavity, the piston cylinder and the upper sealing check valve, etc., and the lower sealing device includes the flow channel, the piston cavity, the piston and the lower sealing check valve. Valves, etc.; the balance between the pressure in the sealing cavity and the external drilling fluid pressure is controlled by the upward and downward sliding of the piston cylinder and the piston, and the opening and closing of the upper sealing check valve and the lower sealing check valve. The utility model has the advantages of good sealing performance, long service life, high temperature and high pressure resistance, small friction coefficient and simple structure, and can be used in gas drilling and mud medium drilling with high temperature and strong vibration.

Description

A kind of oil seal cavity pressure balance screw drill transmission shaft assembly

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

1. An oil-sealed cavity pressure-balanced screw drilling tool transmission shaft assembly, which consists of a housing (1), a transmission shaft (2), an upper seal assembly (3), an upper radial bearing group (4), and a thrust bearing group (5), intermediate seal assembly (6), lower radial bearing group (7), support sleeve (10), lower seal assembly (11) and lower thread (12), etc., and its structural features are: shell The body (1) and the drive shaft (2) cooperate to form the annular cavity (9) and the annular cavity (31); the upper seal assembly (3) is installed in the annular cavity (9) and the annular cavity ( 31), the upper radial bearing group (4), the thrust bearing group (5), the support sleeve (10) and the lower radial bearing group (7) are successively installed under the upper seal assembly (3); the middle seal assembly Cheng (6) is installed on the upper end of the lower radial bearing group (7), and the lower seal assembly (11) is installed on the lower end of the lower radial bearing group (7); the lower end thread (12) is connected to the drill bit.

2. The oil seal chamber pressure balance screw drilling tool drive shaft assembly according to claim 1, characterized in that: the upper seal assembly (3) consists of a sleeve (13), a piston cylinder (14), a bearing (15 ), static sealing ring (16), dynamic sealing ring (17), upper sealing check valve (19) and static sealing ring (20); the outer surface of the sleeve (13) is in contact with the piston cylinder (14), and the inner The surface is in contact with the transmission shaft (2), and 2 to 4 sets of static sealing rings (16) are installed in the inner hole of the sleeve (13) to cooperate with the transmission shaft (2) to form a static seal; the inner hole of the piston cylinder (14) is installed with a dynamic Sealing ring (17), dynamic sealing ring (18) and bearing (15), 2～4 groups of static sealing rings (20) are installed on the outer surface; There is an upper sealing check valve (19) inside the piston cylinder (14).

3. The oil seal chamber pressure balance screw drilling tool transmission shaft assembly according to claim 1, characterized in that: the intermediate seal assembly (6) consists of a dynamic seal ring (21), a static seal ring (22) and a static seal ring (23); the upper inner hole of the lower radial bearing group (7) is equipped with a dynamic sealing ring (21), which cooperates with the support sleeve (10) to form a dynamic seal; the outer surface of the lower radial bearing group (7) is installed with 1 to 3 A set of static sealing rings (22) is matched with the housing (1); 1 to 2 sets of static sealing rings (23) are installed in the inner hole of the upper end of the support sleeve (10) to cooperate with the transmission shaft (2).

4. The oil seal chamber pressure balance screw drilling tool drive shaft assembly according to claim 1, characterized in that: the lower seal assembly (11) consists of a flow channel (24), a piston chamber (25), and a piston (26) , pipe plug (27), lower sealing check valve (28), dynamic sealing ring (29) and dynamic sealing ring (30); the flow channel (24) is inside the lower radial bearing group (7), connecting the lower diameter Install the piston (26) into the gap in the bearing group (7) and the piston cavity (25); install the piston (26) in the piston cavity (25), and install the pipe plug (27) at the lower port of the piston cavity (25); A lower sealing check valve (28) is arranged; a dynamic sealing ring (29) and a dynamic sealing ring (30) are installed in the inner hole of the lower sealing assembly (11), and cooperate with the drive shaft (2) to form a dynamic seal.

5. The oil-seal chamber pressure-balanced screw drilling tool transmission shaft assembly according to claim 2, characterized in that: the contact surface between the sleeve (13) and the piston cylinder (14) is plated with a layer of chromium, and its thickness is 0.05 ~0.20mm to increase the corrosion resistance and wear resistance of the contact surface.