The turbodrill

 

(57) Abstract:

The mud motor includes a housing, one end of which is in communication with the drill pipe for supplying drilling fluid and the inside of which is placed downhole hydraulic motor which was a multi-stage turbine. Each of the stages of a multistage turbine is formed by forming guides through channels drive the stator and forming a work-through channels of the rotor disc mounted on the shaft accommodated in the housing on bearings for rotation and bearing on the end facing the bottom, the rock-breaking tool. The total area of inlet flow channels of the stator disk is from 1/5 to 3/5 of the total area of inlet flow channels of the rotor disc. The invention provides increased power and torque for rock cutting tool. 2 C.p. f-crystals, 5 Il.

The invention relates to a drilling technique for drilling wells in different geological formations, and more specifically to the turbodrill.

In connection with the increase in the drilling of exploration wells in the extraction of oil and gas were created turbodrills new type, which allow you to apply APAR is entom on the shaft about 2000 Nm. However, the known design of hydraulic downhole motors used in turbodrills cannot ensure the normal operation of rock cutting tool of a new type of for developing low power and the generated torque.

Therefore, attempts to increase torque downhole motor to be transmitted to the rock-breaking tool turbodrill, has led to the emergence of the turbodrill, known from the Reference drilling engineer Ed. by C. I. of Misewich, N. A. Sidorova, T. 1, M, Bowels, pages 212-213. Fig. V1.1, 1973.

Famous mud motor includes a housing, one end of which is in communication with the drill pipe for the supply of drilling mud. Inside the body is placed a hydraulic motor, which represents a multi-stage turbine, each of the steps which are formed guideways forming bushing channels drive the stator and forming a work-through channels of the rotor disc. The latter is installed on the shaft accommodated in the housing on bearings for rotation and bearing on the end facing the bottom, the rock-breaking tool. The total sectional area of the flow channels of the disk of the stator corresponds to the total cross-sectional area of flow channels drive the mouth is an increase in the pressure of the drilling fluid, that leads to increase in power and torque, acting on the rock-breaking tool. To significantly increase the power of the downhole motor and the developed torque on rock cutting tool on its shaft has more than 300 steps, which leads to a significant increase of the dimensions of the turbodrill. The latter causes the deformation of the disks of the stator and the rotor, which can lead to their failure. And it reduces the life of the turbo-drill and increases the cost of drilling operations.

The closest technical solution according to the essential features and the achieved result is a turbodrill, known from the textbook "Drilling oil and gas wells" Ed. by Sereda N. G., Solovieva, E. M., M., Nedra, page 109 -110, Fig. 71,72, 1974.

Famous mud motor includes a housing, one end of which is in communication with the drill pipe for the supply of drilling mud. Inside the body is placed a hydraulic motor, which represents a multi-stage turbine, each of the steps which are formed guideways forming bushing channels drive the stator and forming a work-through channels of the rotor disc. The latter is installed on the shaft accommodated in the housing on openarena the sectional area of the flow channels of the disk of the stator corresponds to the total cross-sectional area of flow channels of the rotor disc. When drilling rock cutting tool is driven hydraulic downhole motor. The flow of the drilling fluid supplied through the drill pipe, the drive stator and the rotor disc changes its direction of movement and, flowing from the stage to the stage, gives a part of its hydraulic capacity of each stage. As a result, the power generated by all stages, summarized on the shaft of the turbo-drill and fed to the rock cutting tool. However, the above-described design of the turbo-drill does not provide sufficient power and torque for normal operation of the rock cutting tool of a new type without increasing the number of sections of the downhole motor.

The basis of the invention is the creation of the turbodrill, which is due to structural changes of the stator disk would provide a significant increase in power and torque on rock cutting tool without increasing the number of sections of the downhole motor.

The problem is solved in that the turbo-drill, comprising a housing, one end of which is in communication with the drill pipe for supplying drilling fluid and the inside of which is placed downhole hydraulic motor which snali drive stator and forming a work-through channels of the rotor disc, mounted on the shaft accommodated in the housing on bearings for rotation and bearing on the end facing the bottom, the rock-breaking tool according to the invention, the total area of inlet flow channels of the stator disk is from about 1/5 to about 3/5 of the total area of inlet flow channels of the rotor disc.

This design perform disk stator leads to an increase in pressure of the drilling fluid in ducts formed his shoulder blades. The latter causes an increase in torque on the blades of the rotor disc. For example, when the frequency of rotation of the rotor about 500 rpm and run disk stator according to the invention, is provided on a rock cutting tool torque about 1800 Nm with single-performing downhole motor. Run disk stator with a total area of inlet flow channels is less than 1/5 of the total area of inlet flow channels of the rotor disc will lead to a significant increase in pressure drop on the stator disk and the rotor disc, this will increase the hydraulic losses will decrease the efficiency of the turbo-drill, and will cause heavy wear flowing part of the disk Yu inlet flow channels more than 3/5 of the total area of inlet flow channels of the rotor disc will reduce pressure on the disk of the stator, which in turn will reduce the pressure drop of the drilling fluid between the stator disk and the rotor disc. The latter will cause a reduction in torque and lower power turbodrill, i.e., will bring their values to the widely used well-known turbodrills.

Preferably, the inlet flow channels of the stator disk at all levels were lying on the same diameter and formed through the axial channel, the longitudinal axis of which is parallel to the axis of the shaft.

Such constructive implementation of the stator disk allows less pressure drop in each stage downhole motor to supply drilling fluid with a given flow rate and to provide the necessary torque for the efficient operation of rock cutting tool.

Not less preferably, when the inlet flow channels of the stator disk each subsequent relative to the incoming flow of the drilling fluid level is shifted in the circumferential direction relative to the input disc openings of the stator of the previous stage is at least 1oso that the outlet flow channels of the stator disk at all levels are located on a spiral line with the centre, the left liquid and the emergence of its horizontal component, the vector of which is directed in the direction of rotation of the rotor, which creates additional torque on the blades of the rotor disc. For example, if the offset of the inlet flow channels of the stator disk each subsequent relative to the incoming flow of the drilling fluid level in the circumferential direction relative to the input disc openings of the stator of the previous stage on 15oleads to an overlap of at least one of the outlet flow channels of the stator of the previous stage. Thus, the liquid acting on the blades of the rotor disc, is in an enclosed space bounded by the body of the disk stator subsequent stage, the walls of the flow channel of the rotor disc and the walls of the flow channel disk stator of the previous stage, one of which is a party to the blades of the stator disk, and the other his body. This phenomenon is typical for bulk downhole motors, which have a high power and torque.

Other objectives and advantages of the invention will become clearer from the following specific exemplary embodiment and drawings, in which:

Fig. 1 schematically depicts a turbodrill according to the invention, with a partial tear-out;<
Fig.4 - scan flow part two-speed downhole motor;

Fig. 5 - scan flow part two-speed downhole motor, a variant of execution.

The mud motor made according to the invention, includes a housing 1 (Fig.1), one end 1A is in communication with the drill pipe 2 for supplying drilling fluid, and inside of which is placed downhole hydraulic motor 3, which represents a multi-stage turbine. Each of the steps formed by the guide rails forming bushing 4 channels (Fig.2) disc 5 of the stator and forming a work-through channels 6 disc rotor 7. The wheels 7 are mounted on the shaft 8, are accommodated in the housing 1 on the supports (Fig. not shown) for rotation and bearing on the end 8A facing the bottom, rock cutting tool 9. The total area of inlet flow channels 4 disc 5 of the stator is from about 1/5 to about 3/5 of the total area of inlet flow channels 6 disk 7 of the rotor of each stage. The inlet 4A shafts 4 disc 5 of the stator at all levels lie on the same diameter and form a through axial channel 10, the longitudinal axis 10A of which is parallel to the axis 11 of the shaft 8. The proposed embodiment of the disk 5 of the stator allows the acceptable flow and to provide the necessary torque for the efficient operation of rock cutting tool 9.

In the operation of the turbodrill, the following occurs. Drilling fluid, shown as dotted arrows k, drill pipe 2 serves in the housing 1 of the turbodrill. The hydraulic energy of the fluid flow is converted into mechanical energy of rotation of the shaft 8 carrying a rock cutting tool 9. The flow of the drilling fluid interacts with the body of the stator disk, then enters through a limited number of entrance holes 4A through 4 channels, limited by the blades 12, whence comes in the form of jets. Named jet of drilling fluid impinges on the blades 13 of the rotor disk 7, after which the portion of the jet flow through the bushing 6 channels of the rotor is directed in the axial direction to the input holes 4A shafts 4 of the stator subsequent stage, and the other part of the jet stream continues to move essentially in the horizontal direction, since it is in a confined space, a confined body of the stator disc 5 previous and subsequent steps and the sides of the blades 13 of the rotor disk 7. The moving part of the jet of fluid flow in the direction of arrow m in the horizontal direction increases the torque on each stage of the downhole motor, which increases torque PTO is giving the number of stages of the turbodrill when you create the necessary torque, develop on its shaft, for the efficient operation of modern rock cutting tool.

Embodiment of the turbodrill according to the invention, structurally implemented analogously to the above, this difference lies in the constructive implementation of the disk 14 of the stator. In the disk 14 (Fig.5) of the stator each subsequent stage of the inlet 15A relative to the incoming flow of the drilling fluid in the direction of arrow k flow channels 15 are displaced in the circumferential direction relative to the input holes 15A of the disk 14 of the stator of the previous stage is at least 1oso that weekend openings 15V shafts 15 of the disk 14 of the stator at all levels are located on a spiral line with the center lying on the axis 11 of the shaft 8.

In the operation of the turbo-drill in the version it is running, the following occurs. The drilling fluid through a drill pipe 2 serves in the housing 1 of the turbodrill and she feedthrough channels 15 of the disk 14 of the stator formed by the blades 12, is fed to the blades 13 of the rotor disk 7. Due to the bias input of the holes 15A of the disk stator in each stage is offset from the flow of the drilling fluid in the circumferential direction and the appearance of its horizontal component vector which napravaleno fact, what part of the input and output holes of the rotor of the previous stage is blocked by the body of the stator previous and subsequent stages. Thus a portion of the drilling fluid acting on the blades 13 of the rotor disk 7, is in an enclosed space bounded by the body of the disk 14 of the stator previous and subsequent steps and the sides of the blades 13 of the rotor disk 7 of the previous stage. The fluid enclosed in a limited volume, interacts with the blades 13 of the rotor disk 7, creating increased torque on the shaft 8. Moved from the stage to the stage of the stream of drilling fluid is spiral in nature. Such movement of the drilling fluid characteristic volumetric downhole motors, which have a high power and torque. For example, when the input offset holes 15A shafts 15 of the disk 14 of the stator each subsequent relative to the incoming flow of the drilling fluid level in the circumferential direction, for example in the direction of rotation of the rotor relative to the input holes 15A of the disk 14 of the stator of the previous stage on 15othat is , the step vanes of the disk 7 of the rotor causes it to overlap. This creates an additional volume of liquid, the impact of the hinnon body of the disk 14 of the stator subsequent stage, the walls of the flow channel 6 disk 7 of the rotor and the walls of the flow channel 4 disk 14 of the stator of the previous stage, one of which is a party to the blades 12 of the disk 14 of the stator, and the other his body. An even greater increase in fluid acting on the rotor blades leads to a further increase in torque on the shaft of the turbo-drill.

All the above leads to either increased torque on the shaft of the turbo-drill, for example 30% of the specified rate of the drilling fluid, or to preserve the specified torque, for example, 2000 Nm, on the shaft of the turbo-drill at a reduced flow rate of the drilling fluid, which allows its use with modern high rock cutting tools.

1. The turbo-drill, comprising a housing, one end of which is in communication with the drill pipe for supplying drilling fluid and the inside of which is placed downhole hydraulic motor which was a multi-stage turbine, each of the steps which are formed guideways forming bushing channels drive the stator and forming a work-through channels of the rotor disc mounted on the shaft accommodated in the housing on bearings for rotation and bearing on the end, the law is breaking the channels of the stator disk is from 1/5 to 3/5 of the total area of inlet flow channels of the rotor disc.

2. The turbodrill under item 1, characterized in that the inlet flow channels of the stator disk at all levels lie in the same diametrical plane and form a through axial channel, the longitudinal axis of which is parallel to the axis of the shaft.

3. The turbodrill under item 1, characterized in that the inlet flow channels of the stator disk each subsequent relative to the incoming flow of the drilling fluid level is shifted in the circumferential direction relative to the input disc openings of the stator of the previous stage is at least 1oso that the outlet flow channels of the stator disk at all levels are located on a spiral line with the center lying on the axis of the shaft.

 

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