Downhole hydraulic motor

 

(57) Abstract:

The invention relates to the field of drilling, hydraulic actuators placed in the well. The inventive hydraulic downhole motor includes a housing having an element for connection to the drillstring, and the cavity for supplying washing liquid, mounted rotatably in the cavity for supplying drilling fluid to the shaft attached to it at least one turbine wheel having helical blades and secured to the housing in the cavity for supplying washing fluid to at least one stator element guides the fluid flow channels and the inner surface covering the lateral external surface of the turbine wheel, when this spiral blades are made in the form of spiral grooves on the land side of the external surface of the turbine wheel by a distance less than its length for forming, directing the fluid flow channels are made in the form of longitudinal grooves arranged in two groups on the inner surface of each stator element with the formation around the perimeter of the inner surface of the separation area between the groups, and the number of longitudinal grooves, which can be obtained by carrying out the invention, is to simplify the design and manufacturing techniques downhole motor. 6 Il.

The invention relates to the field of drilling, hydraulic actuators placed in the well.

Known hydraulic downhole motor, containing connected to the drillstring, the housing having a cavity for supplying washing liquid, mounted rotatably in the cavity for supplying drilling fluid to the shaft attached to it by the turbine wheel having helical blades and secured to the housing in the cavity for supplying washing liquid stator element guides the fluid flow channels and the inner surface covering the lateral external surface of the turbine wheel (EN 2017921, E 21 IN 4/02, 1994).

A disadvantage of the known hydraulic downhole motor is relatively low power, due to the technical solution of the stator possible when placing only one turbine.

More efficient and the closest analogue of the claimed invention is a downhole hydraulic motor containing connected to the drillstring, the housing having a cavity for supplying washing liquid, ustanovlennymi, having spiral blades, and fixed to the body in the cavity for supplying washing liquid stator elements with directing the fluid flow channels and the inner surface covering the lateral external surface of the turbine wheel (WO 0008293, 2000).

However, the above-mentioned analog provides technologically complex shape of the turbine wheel and stator elements, which ultimately increases the cost of manufacture and prevents achieving the required reliability.

The task, which is aimed by the invention, is to provide a reliable and relatively inexpensive downhole motor for drilling wells.

The technical result, which can be obtained by carrying out the invention is to simplify the design and manufacturing techniques downhole motor.

This technical result is achieved by hydraulic downhole motor, comprising a housing having an element for connection to the drillstring, and the cavity for supplying washing liquid, mounted rotatably in the cavity for supplying drilling fluid to the shaft attached to it, at least one turbine koyna least one stator element guides the fluid flow channels and the inner surface covering the lateral external surface of the turbine wheel, due to the fact that the spiral blades are made in the form of spiral grooves on the land side of the external surface of the turbine wheel by a distance less than its length for forming and directing the fluid flow channels are made in the form of longitudinal grooves arranged in two groups on the inner surface of the stator element with the formation around the perimeter of the inner surface of the separation area between the groups, the number of longitudinal grooves located in the same plane of the cross section is not equal to the number of spiral grooves.

The essence of the invention is illustrated by drawings, where:

in Fig. 1 shows a General view of hydraulic downhole motor;

in Fig. 2 - section a-a of Fig. 1 without the housing;

in Fig. 3 - section b-B of Fig. 2;

in Fig. 4 - section b-b of Fig. 3;

in Fig. 5 - stator element with a longitudinal slit;

in Fig. 6 turbine wheel with a longitudinal incision.

Hydraulic downhole motor includes a housing 1, item 2 for connection to the drillstring. In case 1 there is a war on it by the turbine wheel 5, having spiral blades made in the form of spiral grooves 6 on the section 7 of the lateral external surface 8 of the turbine wheel 5 and a length "l" of section 7 less than the length "L" side of the external surface 8 forming.

In the cavity 3 for supplying drilling fluid to the housing 1 is fixed stator elements 9 with the inner surface 10, covering the lateral external surface 8 of the turbine wheel 5. On the surface there are 10 guides the fluid flow channels made in the form of longitudinal grooves 11 and 12. The grooves 11 and 12 are arranged in two groups on the inner surface of the stator 10 of the element 9 with the formation around the perimeter of the inner surface 10 of the separation area 13 between the groups, the number of longitudinal grooves 11 or 12, located in the same plane of the cross section is not equal to the number of spiral grooves 6.

Optimization of the regime and the formation direction of flow of washing fluid is provided by the length "l" of section 7, equal to the value 3/5 - 4/5 length "L" along the side of the external surface 8, when performing the spiral grooves 6 with an inclination of grooves for forming angle = 8-25oand length l1a dividing section 13 on the inner surface 10, this, and the offset position of the cross-sections of one group of longitudinal grooves 11 before section 13 with respect to the location of cross-sections of another group of longitudinal grooves 12 after section 13. In addition, to reduce the hydraulic resistance of the longitudinal grooves 11 and 12 and the spiral grooves 6 have sloping end sections 14. Other ratios of these dimensions and other conditions being equal, significantly reduced the torque and efficiency of the engine.

Downhole hydraulic motor operates as follows.

The flush fluid through the element 2 for connection to the drillstring is fed into the cavity 3 of the housing 1. From the cavity 3, the flow of washing fluid enters the space group of longitudinal grooves 11 of the stator element 9, where the pair of inclined end sections 14 with a dividing section 13 of the stator element 9 into the space spiral grooves 6 of the turbine wheel 5 and dynamically acting on the inclined surface of the spiral grooves 6, creates a torque on the turbine wheel 5. On the pair of inclined end sections 14 of the spiral grooves 6 with a space group of longitudinal grooves 12 a flow of washing fluid is displaced into the space channels stator the s corresponding to the turbine wheel 5 and mentioned on all subsequent wheel 5, forcing the rotating shaft 4 by providing the total number of turbine wheel of the torque. Technological form the stator elements and the turbine wheel with channels and lobes in the form of corresponding grooves on the respective surfaces allows for the efficient use of the kinetic energy of the jet flow, and the potential energy of the pressure of the drilling fluid by reducing leaks in constructive minimize the radial clearance and to prevent the axial displacement of the shaft with the turbine wheel relative to the stator elements under the action of axial load and other random factors.

Downhole hydraulic motor, comprising a housing having an element for connection to the drillstring and the cavity for supplying washing liquid, mounted rotatably in the cavity for supplying drilling fluid to the shaft attached to it at least one turbine wheel having helical blades and secured to the housing in the cavity for supplying washing fluid to at least one stator element guides the fluid flow channels and the inner surface covering the lateral external surface of the turbine to which poverhnosti the turbine wheel by a distance less than its length along generatrix, and guides the fluid flow channels are made in the form of longitudinal grooves arranged in two groups on the inner surface of each stator element with the formation around the perimeter of the inner surface of the separation area between the groups, the number of longitudinal grooves located in the same plane of the cross section is not equal to the number of spiral grooves.

 

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