CN106894755A - A kind of waterpower pulse formula is spun helicoid hydraulic motor - Google Patents

Abstract

The invention relates to a hydraulic pulse type rotary punching screw drilling tool for increasing the drilling speed of deep wells and ultra-deep wells in the petroleum and natural gas industry. It solves the problems of difficult drilling in hard formations and low ROP during drilling. The technical solution is: the upper end of the screw stator is connected with the lower end of the upper joint with a screw, the lower end of the screw stator is connected with the upper end of the cardan shaft housing with a screw; the screw rotor is placed in the inner cavity of the screw stator; the upper end of the cardan shaft is connected with the lower end of the screw rotor with a screw , the lower end of the cardan shaft is connected with the upper end of the upper shaft body with a thread; the upper end of the diversion housing is connected with the lower end of the universal shaft housing with a thread, and the lower end of the diversion housing is connected with the middle part of the lower housing; the upper cylinder of the transmission piston is connected with the upper The middle part of the inner cavity of the shaft is fitted with a clearance, and the lower end of the transmission piston is connected with the upper end of the lower shaft body with a screw. The present invention can not only generate rock-breaking torque, but also provide high-frequency axial impact force, and improve the rock-breaking efficiency and mechanical drilling speed of the drill bit; the present invention has a simple mechanical structure and fewer wearing parts.

Description

A hydraulic pulse type rotary percussion screw drilling tool

technical field

The invention relates to a hydraulic pulse type rotary punching screw drilling tool used for increasing the drilling speed of deep wells and ultra-deep wells in the petroleum and natural gas industry.

Background technique

With the continuous development of drilling technology in the oil and gas industry at home and abroad, the drilling depth continues to increase, and the number of deep wells and ultra-deep wells is increasing. After the drilling depth increases, the hardness and strength of the rock will increase significantly under the confining pressure of the formation, and the drillability will be greatly reduced. In order to improve the rock-breaking efficiency of the drill bit in deep formations, a feasible and effective method is to use rotary percussion drilling, that is, to provide axial impact force for the drill bit while rotating the well. Cutting the rock under variable WOB can greatly improve the rock-breaking efficiency, especially the ROP in hard formations.

At present, the screw drilling tool is the most widely used downhole power drilling tool in drilling engineering, which can meet most of the downhole working conditions. However, the conventional screw drilling tool only has the function of rotation, which provides the drill bit with the rotation torque for cutting rocks. Provides the function of axial impact force. Chinese patent CN104033113A provides a rotary punching screw drilling tool, which uses the relative movement of the roller and the cam to provide an axial impact force for the drill bit. However, the patent has a complex structure and many wearing parts, especially the roller and the cam have to bear huge drilling pressure and wear. It must be serious; in addition, when the patent provides the rock-breaking torque for the drill bit, it must also provide the climbing torque for the roller to climb on the cam, which increases the load on the power part of the screw, which will inevitably lead to a reduction in the service life of the power part of the screw.

Based on the above technical background, the present invention provides a hydraulic pulse type rotary percussion screw drilling tool, which provides high-frequency axial impact force while providing rotational torque for the drill bit, and improves the rock-breaking efficiency of the drill bit.

Contents of the invention

The purpose of the present invention is to provide a hydraulic pulse type rotary punching screw drilling tool in order to solve the problems of difficult drilling in hard formations and low ROP in the drilling process.

In order to achieve the above object, the present invention adopts the following technical solutions: a hydraulic pulse type rotary punching screw drilling tool, which is composed of an upper joint, a screw stator, a screw rotor, a cardan shaft housing, a cardan shaft, an upper shaft body, a thrust bearing a. Diversion housing, transmission pin, transmission piston, lower housing, thrust bearing b, half-ring clip, thrust bearing c, disc spring, anti-drop cap and lower shaft body; its structural features are: the upper end of the upper joint and The upper part of the drill string is connected with threads, the lower end of the lower shaft body is connected with the drill bit with threads; the inner cavity of the screw stator is provided with a rubber stator sleeve, the upper end of the screw stator is connected with the lower end of the upper joint with threads, and the lower end of the screw stator is connected with the upper end of the cardan shaft housing with threads Connection; the screw rotor is placed in the inner cavity of the screw stator, and the screw rotor is matched with the rubber stator sleeve in the inner cavity of the screw stator; the upper end of the cardan shaft is connected with the lower end of the screw rotor with a threaded thread, and the lower end of the cardan shaft is connected with the upper end of the upper shaft body with a threaded thread; Three oblique holes are evenly arranged on the upper part of the shaft body to communicate with the inner and outer spaces; a circle of raised steps is arranged on the outer circle of the upper part of the upper shaft body; There are pin slots evenly arranged in the direction; a circle of raised outer edge is arranged on the upper end of the lower casing, three waist-shaped through holes are evenly arranged on the upper part of the lower casing, and four oblique holes are evenly arranged on the middle part of the lower casing to connect the inner and outer spaces , the lower part of the lower shell is evenly provided with two through holes in the circumferential direction to connect the inner and outer spaces, and there is a step in the middle of the inner cavity of the lower shell; the thrust bearing a is installed on the raised step on the upper part of the upper shaft body; the thrust bearing b is installed in the middle of the inner cavity of the lower shell On the steps; the upper end of the diversion housing is connected with the lower end of the cardan shaft housing with a screw, and the lower end of the diversion housing is connected with the middle part of the lower housing with a screw; the upper part of the transmission piston is set as a cylinder, and the middle part of the transmission piston is evenly provided with pins in the outer circumference direction. Sub-groove; the upper cylinder of the transmission piston and the middle part of the inner cavity of the upper shaft have clearance fit, the transmission pin is installed in the space formed by the outer circular pin groove in the middle of the transmission piston and the lower pin groove in the inner cavity of the upper shaft, the lower end of the transmission piston and the upper end of the lower shaft body Threaded connection; three oblique holes are evenly arranged on the upper part of the lower shaft body to connect the inner and outer spaces, and a circle of grooves is set on the outer circle of the middle part of the lower shaft body; two half-ring clips are installed on the grooves on the outer circle of the middle part of the lower shaft body. The bearing c is installed on the end faces of the two half-ring clips, and the disc spring is inserted into the outer circle of the lower shaft and installed on the end face of the thrust bearing c;

The beneficial effects of the present invention are: (1) the present invention can generate high-frequency axial impact vibration, improve the rock-breaking efficiency of the drill bit and the ROP; (2) the present invention is driven by continuous water hammer pressure, which belongs to flexible vibration and avoids mechanical The rigidity of the components is damaged; (3) the present invention has a simple mechanical structure and few wearing parts; (4) the present invention can generate rock-breaking torque and provide axial impact force.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the drive piston of a hydraulic pulse type rotary punching screw drilling tool moving up in the present invention;

Fig. 2 is a structural schematic diagram of the downward movement of the transmission piston of a hydraulic pulse rotary punching screw drilling tool of the present invention;

Fig. 3 is a cross-sectional view of Fig. 1A-A;

Fig. 4 is a cross-sectional view of Fig. 1B-B;

In the figure: 1. Upper joint, 2. Screw stator, 3. Screw rotor, 4. Cardan shaft housing, 5. Cardan shaft, 6. Upper shaft body, 7. Thrust bearing a, 8. Guide housing , 9. Transmission pin, 10. Transmission piston, 11. Lower shell, 12. Thrust bearing b, 13. Half-ring clip, 14. Thrust bearing, 15. Disc spring, 16. Anti-drop cap, 17. Lower shaft body .

detailed description

As shown in Figures 1 and 2, a hydraulic pulse type rotary punching screw drilling tool of the present invention is composed of an upper joint 1, a screw stator 2, a screw rotor 3, a cardan shaft housing 4, a cardan shaft 5, an upper shaft Body 6, thrust bearing a7, guide housing 8, transmission pin 9, transmission piston 10, lower housing 11, thrust bearing b12, half-ring clip 13, thrust bearing c14, disc spring 15, anti-drop cap 16 and lower shaft body 17; its structural features are: the upper end of the upper joint 1 is connected with the upper drill string screw, the lower end of the lower shaft body 17 is connected with the drill bit screw; the inner cavity of the screw stator 2 is provided with a rubber stator sleeve, and the upper end of the screw stator 2 is connected with the upper joint 1 The lower end of the threaded connection, the lower end of the screw stator 2 is connected with the upper end of the cardan shaft housing 4 with a threaded thread; the screw rotor 3 is placed in the inner cavity of the screw stator 2, and the screw rotor 3 is matched with the rubber stator sleeve in the inner cavity of the screw stator 2; The upper end of the shaft 5 is connected with the lower end of the screw rotor 3 with a screw thread, and the lower end of the cardan shaft 5 is connected with the upper end of the upper shaft body 6 with a screw thread; A circle of raised steps is arranged in a circle, four through holes are evenly arranged in the middle of the upper shaft body 6 in the circumferential direction to communicate with the inner and outer spaces, and pin grooves are evenly arranged in the lower part of the inner cavity of the upper shaft body 6 in the circumferential direction; Starting from the outer edge, three waist-shaped through holes are evenly arranged in the upper part of the lower case 11 in the circumferential direction, four oblique holes are evenly arranged in the middle part of the lower case 11 in the circumferential direction to connect the inner and outer spaces, and two through holes are evenly arranged in the lower part of the lower case 11 in the circumferential direction Connecting the inner and outer spaces, the middle part of the inner cavity of the lower housing 11 is provided with a step; the thrust bearing a7 is installed on the raised step at the upper part of the upper shaft body 6; the thrust bearing b12 is installed on the middle step of the inner cavity of the lower housing 11; The upper end is connected with the lower end of the cardan shaft housing 4 with screws, and the lower end of the guide housing 8 is connected with the middle part of the lower housing 11 with screws; the upper part of the transmission piston 10 is set as a cylinder, and the outer circumference of the middle part of the transmission piston 10 is uniformly provided with pin grooves The cylinder on the upper part of the transmission piston 10 is matched with the middle part of the inner cavity of the upper shaft body 6, and the transmission pin 9 is installed in the space formed by the outer circular pin groove in the middle part of the transmission piston 10 and the lower pin groove in the inner cavity of the upper shaft body 6. The transmission piston 10 The lower end is connected with the upper end of the lower shaft body 17 with screws; the upper part of the lower shaft body 17 is uniformly provided with three oblique holes to communicate with the inner and outer spaces, and the outer circle of the middle part of the lower shaft body 17 is provided with a circle of grooves; two half-ring clips 13 are installed on the lower shaft On the groove of the outer circle in the middle of the body 17, the thrust bearing c14 is installed on the end faces of the two half-ring clips 13, and the disc spring 15 is inserted into the lower shaft. The outer circle of the body 17 is installed on the end face of the thrust bearing c14; The lower end of the body 11 is connected with a threaded button.

As shown in Figure 3, the four through holes evenly arranged in the middle of the upper shaft body 6 and the three waist-shaped through holes evenly arranged in the upper part of the lower housing 11 are located at the same axial cross-sectional position, and the upper shaft body 6 is located at the same axial cross-sectional position. During the rotation process, the communication areas between the four through holes of the upper shaft body 6 and the three waist-shaped through holes of the lower housing 11 are periodically changed.

As shown in FIG. 4 , the transmission pin 9 is installed in the space formed by the outer circular pin groove in the middle of the transmission piston 10 and the lower pin groove in the inner cavity of the upper shaft body 6 .

The working principle of a hydraulic pulse type rotary punching screw drilling tool of the present invention is: the present invention is lowered to the bottom of the well, the pump is turned on to circulate the drilling fluid, the screw rotor 3 rotates under the action of the drilling fluid, and the screw rotor 3 drives the cardan shaft 5 , the upper shaft body 6, the transmission piston 10 and the lower shaft body 17 rotate simultaneously; during the rotation process of the upper shaft body 6, the communication area of the four through holes of the upper shaft body 6 and the three waist-shaped through holes of the lower housing 11 occurs periodically Sex changes, resulting in continuous water hammering, and the transmission piston 10 is subjected to changing continuous water hammering force to generate continuous high-frequency axial impact force on the lower shaft body 17.

Claims (2)

1. a kind of waterpower pulse formula is spun helicoid hydraulic motor, is by top connection (1), screw stator (2), screw rotor (3), universal drive shaft Housing (4), universal drive shaft (5), upper axis body (6), thrust bearing a (7), diversion shell (8), trundle (9), drive piston (10), Lower house (11), thrust bearing b (12), semi-ring clamp (13), thrust bearing c (14), disc spring (15), anti-cap off (16) and lower axle Body (17) is constituted；It is characterized in that：Top connection (1) upper end and upper drilling string screwed connection, lower axis body (17) lower end and drill bit silk Button connection；Screw stator (2) inner chamber is provided with elastomer stator set, and screw stator (2) upper end and top connection (1) lower end screw thread connect Connect, screw stator (2) lower end and universal shaft housing (4) upper end screwed connection；Screw rotor (3) inserts screw stator (2) inner chamber, The elastomer stator set of screw rotor (3) and screw stator (2) inner chamber coordinates；Terminal filament under universal drive shaft (5) upper end and screw rotor (3) Button connection, universal drive shaft (5) lower end and upper axis body (6) upper end screwed connection；Upper axis body (6) top is circumferentially uniformly arranged three inclined holes Connection interior or exterior space, upper axis body (6) top is cylindrical to set a circle raised step, and upper axis body (6) middle part is circumferential to be uniformly arranged four Through hole connects interior or exterior space, and upper axis body (6) inner chamber bottom is circumferentially evenly arranged with pin grooves；Lower house (11) upper end sets one and encloses Raised outer rim, lower house (11) top is circumferentially uniformly arranged three waist through hole, and lower house (11) middle part is circumferential to be uniformly arranged four Individual inclined hole connects interior or exterior space, and lower house (11) bottom is circumferentially uniformly arranged two through hole connection interior or exterior spaces, lower house (11) Inner chamber middle part is provided with step；Thrust bearing a (7) is in the raised step on upper axis body (6) top；Thrust bearing b (12) On the middle bench of lower house (11) inner chamber；Diversion shell (8) upper end and universal shaft housing (4) lower end screwed connection, lead Stream housing (8) lower end and lower house (11) middle part screwed connection；Drive piston (10) top is set to cylinder, drive piston (10) The cylindrical circumference in middle part is evenly arranged with pin grooves；Drive piston (10) Upper cylindrical and upper axis body (6) inner chamber middle part gap coordinate, The space that trundle (9) is formed installed in drive piston (10) the cylindrical pin grooves in middle part and upper axis body (6) inner chamber lower pins groove It is interior, drive piston (10) lower end and lower axis body (17) upper end screwed connection；Lower axis body (17) top is circumferentially uniformly arranged three tiltedly Hole connects interior or exterior space, and lower axis body (17) middle part is cylindrical to set a circle groove；Two semi-ring clamps (13) are installed in lower axis body (17) on the cylindrical groove in middle part, thrust bearing c (14) on two semi-ring clamp (13) end faces, be inserted in down by disc spring (15) Axis body (17) is cylindrical on thrust bearing c (14) end face；It is anti-to cap off (16) and lower house (11) lower end screwed connection.

2. waterpower pulse formula according to claim 1 is spun helicoid hydraulic motor, it is characterized in that：The middle part of the upper axis body 6 is circumferential After three waist through hole installations that four through holes and the top of lower house 11 being uniformly arranged circumferentially are uniformly arranged, positioned at same At one axial cross section position.