Device for reducing the rotation speed of the turbo-drill

 

(57) Abstract:

Usage: drilling technique. The inventive device for reducing the rotation speed of the turbo-drill contains a rotary pump, the working bodies of which are located in the chamber filled with viscous oil and isolated from the drilling fluid through the seal. The inner chamber is bounded from above by piston lubricator device, and the working bodies of the pump is separated from podpornoy cavity bottom, in which there are openings. 1 Il.

The invention relates to the field of drilling equipment, namely the widespread hydraulic downhole motors to trueborn.

Wide dissemination of the turbodrills due to simple construction, reliable in operation and use of washing liquid of any chemical composition, and practically any physical parameters. However, turbodrills have a number of disadvantages, the main of which is high speed, due to the limited diametral clearance.

To reduce the frequency of rotation of the mud motor used different devices. The simplest are the lattice hydrocortone (USA N 3128040), which is the pump; the combination of the turbodrill with this pump has received the name "Turboprop engine" (USA N 3964558). However, it should be noted that the screw pump in tandem works almost exclusively in the brake (pump) mode: first, because any downhole motor is used almost exclusively in the right zone power curve; second, due to the fact that the screw attachment to the turbodrill, due to hydroabrasive wear, 50-80 h loses the ability to generate time and becomes a braking device.

As such helical screw pump has two major drawbacks: first, the imbalance (the eccentricity of the rotor), leading to rapid failure of the upper radial bearings and the upper turbodrill turbine; a second disadvantage of the presence of the elastomeric stator limiting the service life and the use of the tandem.

The device described is free from the above disadvantages. It is isolated from the drilling fluid, working in a confined space on a viscous oil rotary pump, the rotor of which is connected to the upper end of the shaft of the turbo-drill. The most rational this design rotary pump in which wall, three or mnogovintovoy pump).

The invention is illustrated in the drawing.

The intended device mounted inside the housing 1 and carries subs 2 and 3 through the beam 4 and 5. It includes a rotary pump consists of a rotor 6 and symmetrically around him the plungers 7, inserted with a minimum clearance in the fitting hole of the working chamber 8,and located above the pump piston lubricator 9, a piston 10 which is mounted a relief valve 11. The lower end of the rotor 6 put down through the stuffing box 12 and connected by means of a square (or hexagonal or splined) coupling 13 with the upper end of the shaft of the turbo-drill. Podpornega the cavity of the lubricator 9 and rotary pump, communicating through a hole in the bottom 14 filled with viscous oil.

The operation of the device.

Supplied drilling pump (not shown) of the washing liquid through the holes in the cross beam 4 enters the annular space between the casing 1 and the working chamber 8 with the lubricator 9, then through the holes in the cross beam 5 in the turbodrill, resulting in rotation it represents is associated with the rotor 6, a rotary pump. The pump works in a confined space "for themselves", Prodanova injection with is the shaft speed of the mud motor to the optimum value; the amount of the latter can be adjusted by changing the viscosity of the oil.

Device for reducing the rotation speed of the turbo-drill comprising a rotary pump, the working bodies of which are located in the chamber filled with viscous oil and isolated from the drilling fluid through the seal installed in its lower part, while the rotor device is gated through the gland and attached to the upper end of the shaft of the turbo-drill through the coupling, characterized in that the inner space of a chamber filled with viscous oil, is bounded from above by piston lubricator device, and the working parts of the rotary pump device is separated from podpornoy cavity bottom, in which there are openings.

 

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