Downhole drilling motors

 

The invention relates to the drilling technique, namely downhole motors for drilling wells. The motor includes a stator with an internal helical teeth, a rotor with external helical teeth, which number is one less than the number of teeth of the stator and the axis of the rotor offset from the axis of the stator on the value of eccentricity equal to half the radial height of the teeth, the reference node, including the shaft, the axial and radial bearings, a device for transmitting rotation and axial loads from the rotor to the shaft reference node, a sub with a bottom in which you have a side opening and a node create hydraulic pressure pulses. The bottom of the sub has a Central and an additional side holes of different diameters: a larger - for the passage of fluid flow, less to exclude dead center position of the engine. Node create hydraulic pressure pulses is made in the form prescribed in the Central hole of the bottom of the sub and sealed Salnikov seal roller, in which top part over the bottom of the sub is placed flap, made with holes, with installed fittings or plugs. On the lower part of the cushion under the bottom of the sub is placed drove, ustanovlivena efficiency of rock failure due to the stability and controllability of the created hydraulic pulses. 4 Il.

The invention relates to the drilling technique, namely downhole motors for drilling wells.

Known downhole drilling motors, containing the sub, the internal helical stator teeth, a rotor with external helical teeth, which number is one less than the number of teeth of the stator, the control node comprising a shaft, axial and radial bearings, and a device for torque transmission and axial loads from the rotor to the shaft reference node, with the axis of the rotor is offset from the axis of the stator on the value of eccentricity equal to half the radial height of the teeth (RF Patent No. 2011778 from 21.09.89 year).

The disadvantage of the downhole motor is that the excavation of rocks of high hardness of the effectiveness of the process of deepening wells is reduced because of the reduction of the mechanical drilling speed due to the static nature of the axial force transmitted from the motor to the rock-breaking tool.

The closest technical solution adopted for the prototype, is a downhole mud motor, containing the sub, the internal helical stator teeth, a rotor with external helical teeth, which number is one less than the number of idealnoi the height of the teeth, the reference node, including the shaft, the axial and radial bearings made with the possibility of axial movement of the shaft and connected to a rotor, and a device for torque transmission and axial loads from the rotor to the shaft reference node, in which the sub is made with a hole, and the node create hydraulic pressure pulses (RF Patent No. 2166053, CL E 21 4/02 from 02.08.99 year).

The disadvantage of the downhole motor is the following. When its work under the action of hydraulic perekachivayuschih the moment of its rotor has a changeable orientation in the stator, resulting in the upper part of the rotor in the direction of flow of the liquid is pressed against the rubber lining of the stator in the area of pole engagement (the area of the convex-concave contact of the teeth), and the lower part of the rotor tends to move away from the plates of the stator in the direction of convex-concave contact of the teeth, resulting in a planetary motion of the rotor are imposed conoidal movement relative displacement of the lower end of the sub with a hole and the upper end of the rotor with the tabs become complex and chaotic, the gap between the protrusion and the end surface of the sub in the zone of the holes and, accordingly, the hydraulic characteristics of the engaged axial load on the bit in the destruction of the breed. This disadvantage increases as wear of the rotor and stator on the interfaced surfaces.

The objective of the invention is to increase the efficiency of rock failure due to the stability and controllability of the created hydraulic impulses.

The problem is solved due to the fact that in the known screw downhole motor contains a stator with an internal helical teeth, a rotor with external helical teeth, which number is one less than the number of teeth of the stator and the axis of the rotor offset from the axis of the stator on the value of eccentricity equal to half the radial height of the teeth, the reference node, including the shaft, the axial and radial bearings, a device for transmitting rotation and axial loads from the rotor to the shaft reference node, a sub with a bottom in which you have a side opening and a node create hydraulic pressure impulses.

The bottom of the sub has a Central and an additional side holes of different diameters: a larger - for the passage of fluid flow, less to exclude dead center position of the engine, and the node create hydraulic pressure pulses is made in the form prescribed in the Central hole of the bottom of the sub and pagerotation the bedroom with holes, with installed fittings or plugs, while on the lower part of the cushion under the bottom of the sub is placed drove installed with the opportunity to interact with the plunger located on the end face of the rotor.

The invention consists in the following. The host is running, creating hydraulic pressure pulses in the form prescribed in sub roll with Salnikov seal with the placement of the upper part of the valve, in which the holes with installed fittings or plugs, and the lower part of the roller placed drove installed with the opportunity to interact with the plunger located on the end face of the rotor, and a Central and an additional side holes of different diameters provides for rotation of the roller with the flap periodic overlap of fluid flow and, thereby, creating gidroimpulsov like a hammer acting on the rotor coil of the engine. However through the use of fittings of different diameters or stub allows selection of the mode of fracture of rock at the corresponding momenta.

In Fig.1 shows a downhole mud motor in longitudinal section; Fig.2 is a longitudinal section of the site to create the initial engine contains sub 1 with a bottom 2, which made the Central hole 3 to accommodate the packing 4 nut 5 and the roller 6 (Fig.2). In addition to the Central hole 3 in the bottom of the sub made a few holes of different diameters: two working larger diameter holes 7 and 8 for the passage of the main stream, which is pumped through the engine fluid, and two bypass holes 9 and 10 to eliminate dead center position of the engine, when the basic operating larger diameter holes 7 and 8 is blocked by the valve 11. Valve 11 mounted on the platen 6 has a hole 12 for placement of interchangeable fittings 13 or plugs. On the lower end of the roller 6 mounted carrier 14. At the end of the rotor 15 having external helical teeth, posted by the pusher 16, on which is loosely mounted a sleeve 17 to reduce friction in the contact of the follower with the planet carrier 14. The plunger 16 through the sleeve 17 and drove 14 transmits the rotation of the rotor 15 roller 6 through the valve 11. The stator 18 has an internal helical teeth, the number of which is greater by one than the number of teeth of the rotor. The axis of the rotor is offset from the axis of the stator on the value of eccentricity equal to half the radial height of the teeth. The stator is attached reference node 19, which includes a housing 20 and shaft 21, mounted the device 24 for torque transmission and axial loads.

A downhole mud motor operates as follows. Supplied from the surface through the string of drill pipe, the working fluid flows into the sub 1 and through holes 7, 8 and 9, 10 enters the upper chamber of the engine. Under pressure drilling fluid, the motor starts to operate with the rotation of the rotor 15, performs a planetary motion, objetivas its outer teeth of the internal teeth of the stator 18. The planetary motion of the rotor 15 is converted into an axial rotation of the shaft 21 the reference node 19 through the device 24 for torque transmission and axial loads. The shaft 21 rotates inside the housing 20, with the axial load of the weight of the drill pipe string is transferred to the rock-breaking tool through sub 1, the stator 18, the rotor 15, the housing 20 reference node 19, the axial bearing 22 and the shaft 21 the reference node.

The rotor of the motor 15 acts through the plunger 16 with the sleeve 17 on the carrier 14 and causes the rotating roller 6 and screw him damper 11.

During the rotation of the valve 11 is periodic closing of the working hole of larger diameter 7 and 8, the bypass of the small-diameter holes 9 and 10.

When opening holes 7 and 8 there is a hydraulic impact, which is reflected on C is the comprehensive isolation of liquid flow through the engine, remain open small holes 9 and 10.

The strength of the formations drilled in different areas are different. For example, in the Volga region breed mainly carbonate, in Western Siberia in the geological cross section a lot Pensilvania rocks.

Therefore, when drilling through carbonate strata of the holes 7 and 8 are closed with plugs installed in the openings of the valve. When the engine is gidroimpulsy under this option are more powerful. Drilling Pensilvania breeds may not require for their destruction powerful gidroimpulsov. In such cases, the apertures of the valves 7 and 8 can be inserted fittings.

The application of the proposed downhole motor will increase the efficiency of destruction of rocks due to gidroimpulsov to the rotating shaft of the engine, and will also allow you to choose the optimal mode of application to the rotating shaft 15 gidroimpulsov by changing nozzles 13 on the cover, or Vice versa.

The application of the proposed downhole motor will:

to increase the power gidroimpulsov which give the breed the effective voltage across the gap and which are comparable or even higher strength rocks to break;

- selection of fittings or installing one or D. the x types of rocks, increasing the mechanical rate of penetration;

- increased speed of drilling is the result of effective stress for rupture in combination with mechanical indentation of the teeth or cutters of the bit.

Claims

A downhole mud motor contains a stator with an internal helical teeth, a rotor with external helical teeth, which number is one less than the number of teeth of the stator and the axis of the rotor offset from the axis of the stator on the value of eccentricity equal to half the radial height of the teeth, the reference node, including the shaft, the axial and radial bearings, a device for transmitting rotation and axial loads from the rotor to the shaft reference node, a sub with a bottom in which you have a side opening and a node create hydraulic pressure pulses, characterized in that the bottom of the sub has a Central and an additional side holes of different diameters: more - for the passage of fluid flow, less to exclude dead center position of the engine, and the node create hydraulic pressure pulses is made in the form prescribed in the Central hole of the bottom of the sub and sealed Salnikov seal cushion at the top is a Church or plugs, at the lower part of the cushion under the bottom of the sub is placed drove installed with the opportunity to interact with the plunger located on the end face of the rotor.

 

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