Boring rig

FIELD: oil and gas well boring equipment.

SUBSTANCE: boring rig comprises turbodrill, drill bit and reducer including several planetary mechanisms and installed in-between. Sun gears of both planetary mechanisms are secured to turbodrill rotor shaft. Carrier with plane pinion axes of upper planetary mechanism is connected to boring rig body. Ring gear is attached to upper link of drill bit. Ring gear of lower planetary mechanism is linked with plane pinion axes of upper planetary mechanism, carrier thereof is connected with lower link of drill bit.

EFFECT: increased efficiency due to increase in turbodrill rotor speed up to optimal value, reduced number of turbodrill steps and hydraulic resistance thereof, increased flushing liquid flow velocity, reduced reactive moment on turbodrill stator and pipe string.

1 dwg

 

The invention relates to drilling for gas and oil production.

Known drilling device consisting of a turbo-drill and drill bits (Kasyanov V.M. Hydraulic machines and compressors. - M.: Nedra, 1970. - 232 S.; Johansen C.V. companion of the drillers. - M.: Nedra, 1981. - 199 C.).

The turbodrill intended for rotation of the drill bit during drilling, is a multi-stage hydraulic turbine driven by the flow of drilling fluid from the mud pump. Each stage of the turbine consists of two blade systems: stationary (stator) and rotating (rotor) (Kasyanov V.M., P.14-16). Drill bit, designed for rock breaking, installed on the shaft of the turbine rotor and is, as a rule, the blades with working edges (K.V. Johansen, P.10-13).

The drilling device has a low efficiency because of the hydraulic turbine operates in a non-optimal mode because of the low rotor speed, which is limited by the conditions on the drill bit mounted on the rotor shaft. A large number of turbine stages required to create a high torque, reduces efficiency due to significant hydraulic resistance provided by blade systems multistage turbodrills. This hydraulic resistance reduces the flow velocity and p is obivochnoy fluid, what causes the decrease of the critical velocity of the upward flow, the so - called speed wool, representing the speed of fluid flow, in which the solid particles remain in suspension, i.e. don't get up and not fall down.

The objective of the invention is to increase the efficiency of the drilling device.

The technical result of the invention increases the performance of a drilling device due to the increase of the rotation frequency of the rotor of the mud motor to the optimum values.

This technical result is achieved by the fact that the drilling device containing the mud motor and drill bit, between the mud motor and drill bit set gear, consisting of two planetary gear mechanisms, the sun gears of both planetary mechanisms mounted on the shaft of the rotor of the mud motor, the upper planetary gear carrier with the axes of the satellites is fixed to the housing of the drilling device, and the epicycle wheel is connected to the upper link of the drill bit; at the lower planetary gear epicycle wheel fixed to the axes of the satellites of the upper planetary gear, and drove connected to the lower link of the drill bit.

Installation of the gearbox between the mud motor and the drill bit allows for a low rotational speed of the drill bit (about 8-12/s) to increase frequencies of the rotor of the mud motor. Torque on the shaft of the rotor depends on the frequency of rotation of the second degree. Increasing the rotor speed leads to a significant increase in torque, which reduces the number of steps of the turbodrill and its hydraulic resistance, increase the rate of flow of drilling fluid and the efficiency of the drilling device. Reaction torque on the stator of a turbo-drill, perceived column pipes, sharply decreases due to the rotation of the links on the drill bit in opposite directions.

The drawing shows a diagram of a drilling device.

The drilling device comprises a mud motor and drill bit. In the casing (pipe) 1 drilling devices located stage of the turbine, consisting of two blade systems: the stator 2 and the rotor 3 (shown only one stage of the turbine). Between the mud motor and drill bit set gear. On the shaft 4 of the rotor 3 turbodrill fixed sun gears 5 and 6 of the planetary gears - upper and lower. The sun gear 5 meshed with satellites 7, mounted on the axles 8 carrier, fixed to the body 1 of the drilling device. Epicycle wheel 9 of the tubular shaft 10 is connected with the upper part 11 of the drill bit. The sun gear 6 meshed with the satellites 12, mounted on the axes of the carrier 13, which shaft 14 located inside the tubular shaft 10, seediness the lower part 15 of the drill bit. Satellites 12 meshed with epicycle wheel 16, which is fixed on the axis 8 of the carrier, fixed to the body 1 of the drilling device.

The operation of the drilling device is as follows. The flow of wash liquid from a mud pump body (tube) 1 a drilling device, acts on the blade system of the mud motor: the stator 2 and the rotor 3, causes the rotation of the shaft 4 of the rotor of the mud motor. Torque from the shaft 4 sun gears 5 and 6 is transmitted to the satellites 7 and 12. Satellites 7, rotating on axes 8 carrier fixed relative to the housing 1, rotate epicycle wheel 9, the tubular shaft 10 and the upper part 11 of the drill bit in a direction opposite to the rotation shaft 4 of the rotor 3 of the turbine. Torque on the upper link 11 and the drill bit will increase and will amount To in relation to the torque on the sun gear 5. Where K is an internal parameter of the planetary mechanism, equal to the ratio of the number of teeth of the epicycle wheel 9 to the number of teeth of the sun gear 5. The sun gear 6 rotates the satellites 12 that objetivas by the epicycle wheel 16, stopped by the axis 8 relative to the housing 1, rotate drove 13, shaft 14, and a lower part 15 of the drill bit in the direction opposite to the upper link 11 of the drill bit and coincides with the direction of rotation of the shaft 4 of the rotor is Bina. Torque on this link will also increase and will amount To+1 relative to the torque on the sun gear 6. The cutting edges of the bottom 15 and top 11 links on the drill bit rotating in opposite directions, destroying the drilling breed, which is washed by the flow of drilling fluid and is carried to the mouth of the well.

The efficiency of the drilling device is increased by increasing the rotation frequency of the rotor of the mud motor to the optimum level, reducing the number of steps of the turbodrill and its hydraulic resistance, increasing the flow rate of drilling fluid and reduce reactive torque on the stator of a turbo-drill and casing pipes.

Drilling device containing the mud motor and drill bit, characterized in that between the mud motor and drill bit set gear, consisting of two planetary gear mechanisms, the sun gears of both planetary mechanisms mounted on the shaft of the rotor of the mud motor, the upper planetary gear carrier with the axes of the satellites is fixed to the housing of the drilling device, and the epicycle wheel is connected to the upper link of the drill bit, the lower planetary gear epicycle wheel fixed to the axes of the satellites of the upper planetary gear, and drove connected to the lower link of the drill bit.



 

Same patents:

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