Well drilling device

FIELD: oil and gas well drilling equipment, particularly hydraulic downhole motors.

SUBSTANCE: device has screw bottomhole motor comprising sub and body for arranging operating tool sections. Tool sections are mating rotor and stator surfaces made in the form of multistart screw pair. Tangential current-speed and inlet drilling mud direction transducer is installed above screw pair. The transducer comprises body, retaining ring and sealing collar. Blades of the transducer are right-handed (in opposition to helical teeth of the rotor and the stator).

EFFECT: increased mechanical penetration rate due to increased load applied to drilling bit without reduction in power and shaft torque indexes.

3 dwg

 

The invention relates to a device for drilling oil and gas wells, namely, hydraulic downhole motors.

A device for drilling wells, comprising a body placed in it by sections of the working bodies, the spindle and the rock-breaking tool with jetting nozzles [1].

Factor hindering the achievement of the claimed technical result of the known device is the considerable expenditure of energy to overcome the hydraulic resistance, the deformation of the rubber ring and the friction step stator (chambers).

Also known modular hydraulic gyratory machine, comprising a stator, a hollow rotor, torsion bar, placed in the hollow rotor, and a connection node of the torsion with the rotor, which is located from the middle of the rotor at a distance of less 0,42 length of the rotor [2].

The reasons that impede the achievement of the claimed technical result is known machines are the increase of the longitudinal vibration of the rotor, the increase in drilling mud losses and reduction in ability to make optimum weight on bit.

When carrying out the invention the technical result is to increase engine efficiency, increased mechanical ROP due to the possibility of increasing the load on the bit without losses in terms of power the torque on the shaft.

This technical result is achieved in that the device for drilling of wells containing a downhole mud motor, including the sub, the body placed in it by sections of the working bodies in the form of a multiple coil pairs, the spindle, the peculiarity is that in the sub above the coil pair has a tangential Converter flow speed and direction of the incoming drilling mud, which is the case with blades right line direction, the retaining ring and the gasket.

Between the claimed technical result and essential features of the invention have the following cause-and-effect relationship. The presence of tangential Converter flow velocity direction of the incoming drilling mud (CCI) provides conditions for optimal entry of drilling fluid in a spiral couple without hydraulic losses in the generation of eddies that can increase the life of the engine.

The invention is illustrated by drawings, where figure 1 presents the screw (volume) hydraulic motor with the installation location of the CCI and the distribution of the active forces of the coil pair. In figure 2, 3 shows a section a-a and section b-B tangential Converter stream.

Device for drilling wells contains a downhole mud motor (figure 1), consisting of the sub is 1, corps, in which there are sections of the working bodies representing the mating surfaces of the rotor 2 and the stator 3 in the form of a multiple coil pair, and the spindle. CCI 4 (figure 2) is installed in the sub 1 over a screw pair and includes a housing 5, the retaining ring 6 and the gasket 7. Chamber 4 provided with blades 8, which are (see figure 3) the right line direction (opposite to the direction line of the spiral teeth of the rotor and stator).

Block 5 of the chamber 4 is made either of steel or of synthetic material. In order to avoid axial displacement is provided by the retaining ring 6. The sealing body 5 is the sealing lip 7. The blades 8 are intended to change the speed and direction of flow.

CCI (figure 1) still installed in the housing sub 1 over a screw pair. The inner blades 8 a height equal to 2h (h - height of the tooth), have the right angle, aiming at the optimal angle to the profile of the teeth of the rotor 2 and stator 3 engine (60-65° in relation to a single working chamber). The distribution of existing efforts on the high-pressure chamber: hydraulic power R, the ring of force P and the pressing force of the rotor to the stator N - indicates that to reduce the force N (contact of the rotor with a rubber stator) must change angle tgγ (the angle of the blades 8 to the chamber) and the UK is to grow the incoming drilling mud with blades 8 tangential Converter flow 4.

The device operates as follows.

The performance of the engine show that the torque increases with increasing pressure, leading to deformation of the sealed seal stator 3 with a partial bending of the working chambers and the subsequent leakage at the bottom mud. The rotation of the rotor 2 (rolling) step 3 stator camera creates high and low pressure, where part of the energy is used to overcome the hydraulic resistance, the deformation of the rubber ring and the friction step 3 stator (chambers). Landing of the rotor 2, a stator 3 is carried out with a certain tension, which significantly affects the energy loss to overcome the compression of the rubber plates when the engine is running. Reducing tension does not give positive results, there is a reduction of the torque on the shaft. Therefore, decreases the ability to make optimum weight on bit. Drilling mud, getting on the blades 8 of the chamber 4, changes the direction of the entrance of the screw pair, providing a reduction in the working chamber of the friction steel rotor 2 and rubberized casing of the stator 3.

Thus, the proposed device for drilling will allow you to convert the speed and direction of flow of the drilling fluid and to achieve increased mechanical MSE of the spine drilling maintaining the required optimum weight on bit.

Sources of information

1. USSR author's certificate No. 717270, M CL2. E 21 3/12, epubl.

2. USSR author's certificate No. 1742459 A1, E 21 In 4/02, publ. 1992 (prototype).

Device for drilling of wells containing a downhole mud motor, including the sub, the body placed in it by sections of the working bodies in the form of a multiple coil pair, and the spindle, characterized in that specified in sub over coil pair has a tangential Converter flow speed and direction of the incoming drilling mud, which is the case with blades right line direction, the retaining ring and the gasket.



 

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