Downhole motor

 

The invention relates to the drilling technique, namely, downhole motors, designed for drilling and maintenance of oil and gas wells. The engine provides the propulsion section and the spindle section consisting of a body, a hollow output shaft, thrust bearings, radial bearings. In the spindle housing section opposite the Windows for flow of liquid in the hollow output shaft is stationary relative to the housing is a flow sleeve that serves as an additional radial support, made with internal channels. Open for the passage of drilling fluid into the hollow output shaft and the internal flow channels of the sleeve are arranged in such a way that the sleeve periodically overlaps with the rotation of the hollow output shaft open for flow of liquid. The axial bearing of the hollow output shaft is spring-loaded. The invention provides improved performance drilling due to more efficient destruction of the rocks a bit when making a chisel in addition to rotational and axial vibrations (shock) and improved flushing of the face from cuttings of the working fluid due to the receipt in her bottom-hole zone in the form of portions, creating a pulse surges in the area of drilling. 1 C.p. f-crystals, 4 Il.

Known downhole motors, consisting of a motor and spindle sections, which include housing, hollow output shaft, the axial bearing and a radial bearing (see book: design, construction and operation of turbodrills, M.: Nedra, 1976, pages 50-56; Screw downhole motors, M.: Nedra, 1999, page 18, page 32-35).

When these downhole motors the bit is attached only rotational motion when washing the face area relatively constant, not changing the flow rate of the fluid flow. The destruction of the breed comes successive cutting its layers upon rotation of the bit.

Known downhole drilling motor patent No. 2110660 (publ. 20.07.2002), containing a section of the working bodies, including the stator and eccentric mounted inside the rotor section of the spindle, comprising a housing, a hollow output shaft, axial and radial bearings, coupling with Windows for the passage of drilling fluid through the hollow output shaft, mounted on the hollow output shaft, and a host of kinematic connection of the rotor with hollow output shaft section of the spindle, and it contains an additional radial bearing mounted on the coupling in the area below the Windows for the passage of drilling fluid, illinoi support, moreover, an additional radial bearing is fixed in the body motionless.

When the downhole motor to the bit attached to only rotational motion when washing the face area relatively constant, not changing the flow rate of the fluid flow. The destruction of the breed comes successive cutting its layers upon rotation of the bit.

The invention aims to improve the performance of drilling due to more efficient destruction of the rocks a bit when making a chisel in addition to rotational and axial vibrations (shock) and best flushing of the face from cuttings of the working fluid due to the receipt in her bottom-hole zone in the form of portions, creating a pulse surges in the area of drilling.

To achieve the technical result in the downhole motor that contains the motor section and the spindle section consisting of a body, a hollow output shaft, thrust bearings, radial bearings, the spindle housing section opposite the Windows for flow of liquid in the hollow output shaft is stationary relative to the housing is a flow sleeve that serves as an additional radial support, made with internal channels, and thus open the way, the bushing occasionally overlaps with the rotation of the hollow output shaft open for flow of liquid, and the axial bearing of the hollow output shaft may be spring-loaded.

Distinctive features of the proposed downhole motor from above, closest to him, is that in the spindle housing section opposite the Windows for flow of liquid in the hollow output shaft is stationary relative to the housing is a flow sleeve that serves as an additional radial support, made with internal channels, and open for the passage of drilling fluid into the hollow output shaft and the internal flow channels of the sleeve are arranged in such a way that the sleeve periodically overlaps with the rotation of the hollow output shaft open for flow of liquid, and the axial bearing of the hollow output shaft may be spring-loaded.

Due to the presence of these signs of increased drilling performance due to more efficient destruction of the rock bit. The bit in addition to the rotational given additional axial oscillations (beats) improved flushing of the face from cuttings of the working fluid due to the receipt in her bottom-hole zone in the form of portions, creating a pulse surges in song.1 shows a motor section of the downhole motor (option downhole motor);

in Fig.2 - spindle section of the downhole motor;

in Fig.3 - section a-a in Fig.1 (the position of the hollow output shaft, when the duct is open);

in Fig.4 - section a-a in Fig.1 (the position of the hollow output shaft, when the duct is closed).

Downhole motor includes motor section (Fig.1) and the spindle section (Fig.2), consisting of a body 1, a hollow output shaft 4, the axial bearing 7, the radial bearings 10. In the case of the spindle section 1 downhole motor rotary-percussion above the upper radial bearing 2 is stationary relative to the housing is a flow sleeve 3 with channels on its inner surface, serving as an additional radial support, and a hollow output shaft 4 or coupling 5 window 6 for the flow of drilling fluid inside the hollow output shaft to the bit, which during the rotation of the hollow output shaft from the motor section periodically overlap the inner surface of the flow sleeve 3 (Fig.3) and the axial bearing 7 of the hollow output shaft spring-loaded disc springs 8, enabling axial movement of the hollow output shaft relative to the housing 1-2 mm within the stiffness of the springs and axial force on the bit.

The work of the downhole motor oudestraat drill string to the bottom of the drill in the engine section of the downhole motor and has a pressure before entering the motor section of the P1(Fig.1). After passing through the motor section, the working fluid causes rotation of the rotor 9 (turbine shaft) and is at the entrance to the spindle section of the pressure P2. When the position of the hollow output shaft relative to the flow sleeve in position, when the duct is closed (Fig.4), pressure P2increases and tends to be equal to the pressure P1due to inertia (kinetic energy of the flow). The flow rate of the working fluid in the engine sections ranging from 0.5 (D-42), 50 l/s (D1-240, TRT-240). Further, when the rotation of the rotor (turbine shaft) rotates the hollow output shaft, the rotor (turbine shaft and hollow output shaft rigidly interconnected by a torsion bar or coupler relative to the flow sleeve rigidly mounted in the housing, and open the window for flow of the working fluid inside the hollow output shaft to the bit. Pressure P2sharply decreases, the pressure difference P1and R2(differential pressure) on the motor section is changed, the flow rate abruptly increases. The process is repeated, i.e., duct fluid flow is blocked by the sleeve. When the rotation of the hollow output shaft one turn is 4-fold overlap and the opening of the flow is enaut depending on drilling conditions (hardness rocks and the necessary energy and frequency of impact). Number of floors flow can be from 1 to 12 or more times per revolution of the hollow output shaft. Periodic change of the pressure drop in the engine section causes a periodic variation in hydraulic eject the axial force acting on the rotor (turbine shaft), and because the rotor (turbine shaft) is rigidly connected with a hollow output shaft through a torsion coupling and hollow output shaft has the possibility of axial movement within the stiffness of the Belleville springs, limiting its movement, the hollow output shaft and the bit receive, in addition to rotational and even variables axial movement (shock) with a frequency proportional to the number of channels the flow sleeve and the rotational speed of the hollow output shaft, and the working fluid is supplied to the zone drilling in the form of wave portions (impulse hammer) to provide the best washing (removal) of destroyed rock (sludge) from the face, increased drilling performance due to more efficient destruction of rocks.

Claims

1. Downhole motor that contains the motor section and the spindle section consisting of a body, a hollow output shaft, the axial bearing, Radialnaya shaft is stationary relative to the housing is a flow sleeve, serving additional radial support, made with internal channels, and open for the passage of drilling fluid into the hollow output shaft and the internal flow channels of the sleeve are arranged in such a way that the sleeve periodically overlaps with the rotation of the hollow output shaft open for flow of liquid.

2. Eboiny engine under item 1, characterized in that the axial bearing of the hollow output shaft is spring-loaded.

 

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