GB2152588A - Downhole rotary fluid- pressure motor - Google Patents
Downhole rotary fluid- pressure motor Download PDFInfo
- Publication number
- GB2152588A GB2152588A GB08401072A GB8401072A GB2152588A GB 2152588 A GB2152588 A GB 2152588A GB 08401072 A GB08401072 A GB 08401072A GB 8401072 A GB8401072 A GB 8401072A GB 2152588 A GB2152588 A GB 2152588A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- torsion bar
- motor
- stator
- slot
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 230000020347 spindle assembly Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
- F16D1/093—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping
- F16D1/097—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring expansion only, e.g. with an expanded ring located between hub and shaft
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0076—Fixing rotors on shafts, e.g. by clamping together hub and shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
In an eccentric-screw type motor for driving eg. a rock- breaking tool, the rotor 2 is connected to an output shaft 7 by way of a torsion bar 6, the latter being attached to the rotor in an area above the zone of contact between the rotor and stator teeth in order to stabilize the motion of the rotor. The shaft may be hollow and the lower end of the torsion bar may be connected thereto by means of a coupling 9 with holes 9a through which the spent working fluid can enter the shaft and thence flow down to the tool. <IMAGE>
Description
SPECIFICATION
Helical bore-hole motor
This invention relates to well drilling technology, and more particularly to helical bore-hole motors. Such motors can find application for driving rock-cutting tools in bore-hole drilling, especially in drilling for oil and gas. They can be used with equal success for drilling both vertical and inclined bore-holes.
The invention provides a helical bore-hole machine comprising arranged with a preselected eccentricity a rotor and stator assembly defining high and low pressure chambers for the paSsage of a fluid medium therethrough, and a torsion bar rigidly connected by one end thereof to the rotor and by the other end to a shaft of a spindle assembly, according to the invention, connection between the torsion bar and the rotor is disposed above the area of contact of helical teeth of the rotor with helical teeth of the stator.
Preferably, for connecting the rotor to the torsion bar, the rotor is provided with a recess tapering upwardly and a through-slot disposed above this recess perpendicularly to its axis to communicate therewith, whereas the torsion bar has a conical portion corresponding to the tapered recess of the rotor and terminating in a tailpiece of rectangular configuration received by the slot and having in cross-section dimensions corresponding to the dimensions of this slot. Such a connection of the rotor to the torsion bar is structurally simple and reliable in operation.
It is also preferable that an annular groove for accommodating a sealing element be provided in the conical portion of the torsion bar.
The provision of such a sealing element would prevent the mating conical surfaces from being damaged by the fluid medium.
Advisably, the height of the through-slot is such that a gap is formed between its end and the end face of the tailpiece of the torsion bar.
The provision of such a gap simplifies disassembly of the motor by forcing a wedge tool into the gap to detach the rotor from the torsion bar.
The rotor may be made up of two interconnected sections, particularly one having the tapered recess with the through-slot therein for connection to the torsion bar, and the other section having helical teeth engageable with the helical teeth of the rotor. This arrangement of the rotor requires less effort for its manufacture.
Preferably, the torsion bar is disposed inside the rotor so that the end fae of its tailpiece is above the end face of the stator. This arrangement of the torsion bar makes it possible to detach it from the rotor without disconnecting the stator from the spindle assembly, which is especially important for disassembling the helical bore-hole motor when the rotor and stator are sludged.
In view of the aforegoing, the helical borehole motor embodying the present invention ensures stabilized movement of the rotor in the stator, reduces mechanicai losses, and therefore increases the load capacity and extends the service life of the motor. In addition, the proposed motor is less complicated to fabricate and operate.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal sectional view of a helical bore-hole motor;
Figure 2 is an enlarged section taken along the line Il-Il in Fig. 1;
Figure 3 is the detail A in Fig. 1, grossly enlarged;
Figure 4 is a section taken along the line
IV-IV in Fig. 3;
Figure 5 is an enlarged section taken along the line V-V in Fig. 1 without an upper adapter but with a wedge tool for detaching the rotor from the torsion bar; and
Figure 6 is a schematic of forces exerted on the rotor in the course of operation of the helical bore-hole motor.
The helical bore-hole motor illustrated comprises a stator 1 and a rotor 2 arranged with a preselected eccentricity e determined by the distance between the respective axes O (Fig.
1) and 02 of the stator 1 and the rotor 2.
The stator 1 has a metal housing 3 with an elastomeric lining 4 bonded to its inner surface, helical teeth being provided on this elastomeric lining 4. The outer surface of the rotor 2 is likewise provided with helical teeth, the number of teeth on the rotor being one less than the number of teeth on the elastomeric lining 4 of the stator engaging therewith.
The helical teeth of the rotor 2 and stator 1 define high and low pressure chambers for the passage under pressure of a fluid medium therethrough to produce a torque.
The interior 5 of the rotor 2 accommodates a torsion bar 6 rigidly connected to the rotor 2 and serving for transmitting torque from the rotor 2 to a hollow shaft 7 (Fig. 1) of a spindle assembly 8. The lower end of the torsion bar 6 is fixedly attached to a coupling 9 secured on the shaft 7 of the spindle assembly 8. The coupling 9 is provided with through-holes 9a for the fluid medium to pass into the interior of the shaft 7.
The torsion bar 6 is so arranged that its lower end is coaxial with the axis 0, (Fig. 1) of the stator 1, its upper end being coaxial with the axis 02 of the rotor 2. The axis 03 of the torsion bar 6 is therefore interposed between the axes Or and 02.
The spindle assembly 8 of the helical borehole motor comprises a housing 10 (Fig. 1) with a bearing 11, and the shaft 7 serving to carry a rock breaking tool (not shown). The bearing 11 is affixed to the shaft 7 by means of a nut 12.
The stator 1 is threadedly connected to the housing 10 of the spindle assembly 8 by way of an adapter 1 3. The upper end of the stator 1 is likewise threadedly connectable to an adapter 1 4,which in turn serves for joining the helical bore-hole motor to a string of drill pipes (not shown).
The torsion bar 6 is connected to the rotor 2 in a location substantially above the zone of contact of the helical teeth of the rotor 2 with those of the stator 1. An advantage of this location for connecting the torsion bar 6 to the rotor 2 will be more fully understood when the manner in which the helical borehole motor operates is described later in the description. For connecting the rotor 2 to the torsion bar 6 the rotor 2 is provided with a recess 1 5 (Fig. 3) tapering upwardly. This recess communicates with a through-slot 1 6 (Figs. 3 and 4) arranged in the rotor above the recess 1 5 perpendicularly to its axis.
The upper end of the torsion bar 6 has a conical portion 1 7 in shape and dimensions corresponding to the tapered recess 1 5 to thereby enter thereinto for connecting the rotor 2 and the torsion bar 6. The portion 1 7 of the torsion bar 6 terminates in a tailpiece 1 8 which is received by the slot 1 6 of the rotor 2.
The tailpiece 1 8 is rectangular in crosssection with a thickness b (Fig. 4) corresponding to the width of the slot 1 6. This arrangement of the tailpiece 1 8 makes it impossible for the rotor 2 to turn relative to the torsion bar 6 at the initial moment of operation of the helical bore-hole motor.
In order to prevent the mating conical surfaces of the rotor 2 and the portion 1 7 of the torsion bar 6 from being damaged by the fluid medium in the course of extended operation of the helical bore-hole motor, a sealing element 19 (Fig. 3) is secured in an annular groove provided in the conical portion 1 7 of the torsion bar 6. The sealing element 19 is preferably secured at the top part of the conical portion 1 7 of the torsion bar 6.
The through-slot 1 6 of the rotor 2 is of such a height that when the taiipiece 1 8 is received therein a gap remains between the end face of the tailpiece and the end of the slot 1 6 for a wedge 20 (Fig. 5) to be inserted to detach the rotor 2 from the torsion bar 6.
To increase the contact area of the wedge 20 with the end face of the tailpiece 18, this end face is chamfered an angle equal to the angle of the wedge 20.
For a more simplified manufacture of the rotor 2 (Fig. 3) it is made up of two sections 2a and 2b threadedly interconnected therebetween.
Further, in order to prevent this connection from being loosened, it has a left-hand thread, whereas the tapered recess 1 5 and the through-slot 1 6 are provided in the section 2a of the rotor 2. The section 2b of the rotor 2 accommodates the helical teeth engageable with the helical teeth of the stator 1.
The torsion bar 6 is secured so that the end face of its tailpiece 1 8 is disposed substantially above an end face 21 (Fig. 5) of the stator 1, which enables one to detach the rotor 2 from the torsion bar 6 without extracting the rotor 2 from the stator 1.
The rotor 2 is adapted to execute planetary motion inside the elastomeric lining 4 of the stator 1. The axis O2 of the rotor 2 is therefore caused to perform translatory rotation relative to the axis 0, of the stator 1 to move about the circumference of the radius e in a counterclockwise direction, whereas the rotor 2 per se rotates about its own axis 02 clockwise thereby executing absolute rotation.
The helical bore-hole motor described above operates as follows.
A drilling fluid (the fluid medium) forced by a surface pump along the drill string (not shown) is conveyed to the inside of the adapter 1 4 to enter the high pressure chamber and rotate the rotor 2.
From the bottom part of the stator 1 the drilling fluid is conveyed through the holes 9a of the coupling 9 to the interior of the shaft 7 and escapes through a drill bit (not shown) to the interior of the bore-hole.
It is important that during operation the rotor 2 of the helical bore-hole motor is at all times offset from the axis Oi of the stator 1 (by the eccentricity e) to execute the planetary motion, whereas the shaft 7 of the spindle assembly 8 rotates inside the bearing 11 coaxially with the axis O of the stator 1, which axis coincides with the longitudinal centreline of the motor.
The planetary motion of the rotor 2 is converted into rotation of the shaft 7 thanks to the use of the torsion bar 6. The torsion bar 6 acts to transmit torque and axial force to the shaft 7 through the coupling 9.
The upper end of the torsion bar 6 and the rotor 2 are offset relative to its lower end a distance equal to the eccentricity e. With reference to Fig. 6, as a result of such disposition of the torsion bar 6 an elastic force G is exerted by the torsion bar 6 on the rotor 2. In the course of operation the rotor 2 is acted upon by a twisting moment M resulting from unbalanced hydraulic forces, whereby the rotor 2 is caused to be out of alignment in the elastomeric lining 4 of the stator 1.
In the motor under consideration the attachment point of the torsion bar 6 to the rotor 2 overlies the area of contact between the helical teeth of the rotor 2 with the elastomeric lining 4 of the stator 1. Such an arrangement ensures that the motion of the rotor 2 inside the stator 1 is stabilized owing to the fact that the elastic force G of the torsion bar 6 counteracts the twisting moment M arising from the unbalanced hydraulic forces. Stabilized movement of the rotor 2 reduces specific loads imposed on the rotor in the elastomeric lining 4 of the stator 1 and consequently provides for a longer life of the motor.
The rotor 2 is detached from the torsion bar in the following manner.
During operation of the helical bore-hole motor sludging of the chambers defined by the rotor 2 and stator 1 may occur, in which case the motor must be disassembled; for this purpose the adapter 1 4 is disconnected from the housing 3 of the stator 1. Thereafter, the wedge 20 is forced into the slot 1 6 to detach the rotor 2 from the torsion bar 6.
In other respects, the helical bore-hole motor is dismantled in any known suitable manner.
A pilot model of the helical bore-hole motor of 85 mm in diameter has been tested for well drilling. The results of tests have shown that the rotor 2 and stator 1 have become 30 to 35% more durable compared to the rotors and stators of prior art helical bore-hole machines.
Claims (7)
1. A helical bore-hole motor comprising a rotor and a stator arranged with a given eccentricity and defining high and low pressure chambers for the passage of a fluid medium therethrough, and a torsion bar rigidly connected by one end thereof to the rotor and by the other end to a shaft of a spindle assembly, the location of the connection point of the torsion bar to the rotor occupying an area substantially above the zone of contact of helical teeth of the rotor with helical teeth of the stator.
2. A motor as claimed inclaim 1, in which, for connecting the rotor to the torsion bar, the rotor is provided with a recess tapering upwardly and a through-slot disposed above this recess perpendicularly to its axis and communicable therewith, the torsion bar having a conical portion corresponding in shape and dimensions to the tapered recess and terminating in a rectangular tailpiece received by the slot of the rotor and having cross-sectional dimensions conforming to the dimensions of the slot.
3. A motor as claimed in claim 2, in which the conical portion of the torsion bar has an annular groove to accommodate a sealing element.
4. A motor as claimed in claim 2 or 3, in which the height of the slot is such that a gap is available between its end and the end face of the torsion bar tailpiece.
5. A motor as claimed in any of claims 2 to 4, in which the rotor is made up of two interconnected sections, one of the sections having the tapered recess with the throughslot for connection to the torsion bar, the other section having helical teeth engageable with the helical teeth of the stator.
6. A motor as claimed in any of claims 2 to 5, in which the torsion bar is accommodated inside the rotor such that the end face of its tail piece overlies the end face of the stator.
7. A helical bore-hole motor substantially as described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08401072A GB2152588B (en) | 1984-01-14 | 1984-01-14 | Downhole rotary fluid-pressure motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08401072A GB2152588B (en) | 1984-01-14 | 1984-01-14 | Downhole rotary fluid-pressure motor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8401072D0 GB8401072D0 (en) | 1984-02-15 |
| GB2152588A true GB2152588A (en) | 1985-08-07 |
| GB2152588B GB2152588B (en) | 1987-08-26 |
Family
ID=10555050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08401072A Expired GB2152588B (en) | 1984-01-14 | 1984-01-14 | Downhole rotary fluid-pressure motor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2152588B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4679638A (en) * | 1985-03-13 | 1987-07-14 | Hughes Tool Company | Downhole progressive cavity type drilling motor with flexible connecting rod |
| US5135060A (en) * | 1991-03-06 | 1992-08-04 | Ide Russell D | Articulated coupling for use with a downhole drilling apparatus |
| US5139400A (en) * | 1989-10-11 | 1992-08-18 | Ide Russell D | Progressive cavity drive train |
| EP0566144A1 (en) * | 1992-04-16 | 1993-10-20 | Halliburton Company | Downhole motor having a flexible connecting rod |
| US5527220A (en) * | 1994-03-23 | 1996-06-18 | Halliburton Company | Articulatable joint with multi-faceted ball and socket |
| US5529428A (en) * | 1992-10-08 | 1996-06-25 | Bischof; Albrecht | Metallic structural element for connecting workpieces consisting of wood, woodworking material or plastic |
| WO1998020228A1 (en) * | 1996-11-04 | 1998-05-14 | Tiebo Tiefbohrservice Gmbh & Co. Kg | Turbodrill with reduction gear |
| US7226279B2 (en) * | 2003-03-25 | 2007-06-05 | Obschestvi S Ogranichennoi Otvetstvennostyu “Firma Radius-Servis” | Gerotor mechanism for a screw hydraulic machine |
| GB2454900A (en) * | 2007-11-22 | 2009-05-27 | Schlumberger Holdings | Self circulating drill bit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB622583A (en) * | 1946-12-17 | 1949-05-04 | Rene Joseph Louis Moineau | Improvements in spiral gear pumps, engines or compressors |
| GB628203A (en) * | 1947-09-04 | 1949-08-24 | Fmc Corp | Improvements in meshing-screw pumps |
| GB1220848A (en) * | 1968-06-05 | 1971-01-27 | Mono Pumps Ltd | Rotary pump or motor with an eccentrically rotating rotor |
| GB1285377A (en) * | 1969-10-15 | 1972-08-16 | Mono Pumps Ltd | Rotary pump or motor with an eccentrically rotating rotor |
| GB1379907A (en) * | 1971-05-05 | 1975-01-08 | Stothert & Pitt Ltd | Internally-meshing helical screw pumps |
| GB1399842A (en) * | 1973-02-09 | 1975-07-02 | Waite W E | Rotary positive displacement pumps |
| GB1475242A (en) * | 1974-09-05 | 1977-06-01 | Allen C | Positive displacement internally-meshing rotary screw pump and drive coupling therefor |
| GB2084697A (en) * | 1980-09-24 | 1982-04-15 | Inst Burovoi Tekhnik | Planetary mechanism |
-
1984
- 1984-01-14 GB GB08401072A patent/GB2152588B/en not_active Expired
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB622583A (en) * | 1946-12-17 | 1949-05-04 | Rene Joseph Louis Moineau | Improvements in spiral gear pumps, engines or compressors |
| GB628203A (en) * | 1947-09-04 | 1949-08-24 | Fmc Corp | Improvements in meshing-screw pumps |
| GB1220848A (en) * | 1968-06-05 | 1971-01-27 | Mono Pumps Ltd | Rotary pump or motor with an eccentrically rotating rotor |
| GB1285377A (en) * | 1969-10-15 | 1972-08-16 | Mono Pumps Ltd | Rotary pump or motor with an eccentrically rotating rotor |
| GB1379907A (en) * | 1971-05-05 | 1975-01-08 | Stothert & Pitt Ltd | Internally-meshing helical screw pumps |
| GB1399842A (en) * | 1973-02-09 | 1975-07-02 | Waite W E | Rotary positive displacement pumps |
| GB1475242A (en) * | 1974-09-05 | 1977-06-01 | Allen C | Positive displacement internally-meshing rotary screw pump and drive coupling therefor |
| GB2084697A (en) * | 1980-09-24 | 1982-04-15 | Inst Burovoi Tekhnik | Planetary mechanism |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4679638A (en) * | 1985-03-13 | 1987-07-14 | Hughes Tool Company | Downhole progressive cavity type drilling motor with flexible connecting rod |
| US5139400A (en) * | 1989-10-11 | 1992-08-18 | Ide Russell D | Progressive cavity drive train |
| US5135060A (en) * | 1991-03-06 | 1992-08-04 | Ide Russell D | Articulated coupling for use with a downhole drilling apparatus |
| EP0566144A1 (en) * | 1992-04-16 | 1993-10-20 | Halliburton Company | Downhole motor having a flexible connecting rod |
| US5529428A (en) * | 1992-10-08 | 1996-06-25 | Bischof; Albrecht | Metallic structural element for connecting workpieces consisting of wood, woodworking material or plastic |
| US5527220A (en) * | 1994-03-23 | 1996-06-18 | Halliburton Company | Articulatable joint with multi-faceted ball and socket |
| WO1998020228A1 (en) * | 1996-11-04 | 1998-05-14 | Tiebo Tiefbohrservice Gmbh & Co. Kg | Turbodrill with reduction gear |
| US7226279B2 (en) * | 2003-03-25 | 2007-06-05 | Obschestvi S Ogranichennoi Otvetstvennostyu “Firma Radius-Servis” | Gerotor mechanism for a screw hydraulic machine |
| GB2454900A (en) * | 2007-11-22 | 2009-05-27 | Schlumberger Holdings | Self circulating drill bit |
| GB2454900B (en) * | 2007-11-22 | 2012-01-11 | Schlumberger Holdings | Self-circulating drill bit |
| US8833490B2 (en) | 2007-11-22 | 2014-09-16 | Schlumberger Technology Corporation | Self-circulating drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8401072D0 (en) | 1984-02-15 |
| GB2152588B (en) | 1987-08-26 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |