A mechanical vibration impact motor

Abstract

The present invention relates to a mechanical vibration impact motor, comprising a motor short section and a vibration transmission shaft short section, wherein the vibration transmission shaft short section comprises a bearing housing, a bearing housing, an output shaft, an extension shaft, a spring housing, a spring body, a locking sleeve, a locking block, an upper impact body, a lower impact body, a drill bit joint, a stabilizer housing and a roller. The lower end of the output shaft is connected to the extension shaft, the extension shaft is spline-connected to the drill bit joint, the guide structure of the upper impact body is matched with the guide groove of the stabilizer housing, the lower part of the upper impact body is evenly distributed with rollers having sliding bearings on the circumference, the lower part of the lower impact body is fixedly connected to the drill bit joint, and the upper end surface of the lower impact body is evenly distributed with impact surfaces matched with rollers. The impact and energy storage processes of the vibration impact device are completed simultaneously, occupying a short motor rotation cycle time, outputting a pulse impact load, and significantly improving the cutting efficiency of the drill bit.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field drilling tools, and in particular to a mechanical vibration impact motor. Background Art

[0002] Under the current drilling process conditions, the screw motor with PDC drill bit and rotary table dual drive composite drilling is an effective way to improve the mechanical penetration rate, but for abrasive and brittle formations, the mechanical penetration rate needs to be improved urgently. The main reason is that the rock formation is hard, and the PDC drill bit is in a state of blocking and sliding for a long time during a rotation cycle, and cannot effectively and evenly eat into the formation, resulting in low cutting efficiency, resulting in low mechanical penetration rate. Studies have shown that applying a certain frequency and appropriate size of axial impact load to the drill bit can effectively improve the drill bit's blocking and sliding state, allowing the drill bit to eat into the formation more effectively, thereby significantly improving the mechanical penetration rate.

[0003] At present, some screw motors with impact functions have been developed at home and abroad. Their working principle is mainly to add an impact device at the position of the screw drive shaft. The impact device adopts two coupled disc structures with a certain tooth shape to directly or indirectly mesh with each other. One of the disc structures is connected to the motor housing and can produce axial displacement, and the other is driven to rotate by the screw drive shaft. During the relative rotation of the two disc structures, impact is generated due to the direct or indirect interaction of the tooth shape. An impact working cycle includes two working processes: energy storage and impact. The impact motor of this structure has the problem that the energy storage process occupies a long time of the drill bit rotation cycle, which generally affects the rotation output effect of the motor. At the same time, the life of the impact device is limited. Summary of the invention

[0004] In view of the above problems, the present invention provides a mechanical vibration impact motor, in which the energy storage and impact processes of the motor vibration impact device are carried out simultaneously, which significantly reduces the time occupied by the vibration impact process in the motor rotation cycle, and enables the screw motor to output a pulsed axial vibration impact load while outputting a rotational torque, thereby more effectively improving the blocking and sliding states of the drill bit, thereby improving the rock breaking efficiency of the PDC drill bit for abrasive and brittle formations, thereby achieving the purpose of increasing the drilling speed of the drilling machine.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a mechanical vibration impact motor, including a motor short section 3 and a vibration transmission shaft short section 5, an extension shaft 502, a spring housing 503, a spring body 504, a locking sleeve 505, a locking block 506, an upper impact body 507, a lower impact body 508, a drill head joint 509, a centralizer housing 511, and a roller 512; the vibration transmission shaft short section 5 includes a series bearing housing 515 and a series bearing 516 arranged in the series bearing housing 515 and an output shaft 501; The upper end of the spring housing 503 is fixedly connected to the series bearing housing 515, and the lower end is fixedly connected to the stabilizer housing 511 to form an external structure; the top of the drill joint 509 is a spline, the middle part is an external connection thread, and the lower part is provided with a drill thread; the extended shaft 502 is a hollow body, the upper end of which is fixedly connected to the output shaft 501, the lower end has an external convex edge, and the lower end is splined to the top of the drill joint 509 to form a central structure; the middle of the upper part of the stabilizer housing 511 is a through hole with a reduced diameter, and the inner wall of the through hole is uniformly distributed with 2-6 rectangular guide grooves 511a in the circumferential direction; the upper impact body 507 is a cylinder with a slightly thicker lower part and an open keyway structure in the upper part, and the outer surface of the thick cylinder wall of the lower section of the cylinder is uniformly distributed with 2-6 arc grooves inward in the circumferential direction, and the roller 512 is connected to the roller shaft 507c Connected in each arc-shaped groove, an open guide groove 507b is arranged on the upper part of the cylinder body, which is axially plugged into the rectangular guide groove 511a on the inner wall of the through hole of the stabilizer shell 511, and locking grooves 507a are arranged on both sides of the upper end of each guide groove 507b, and the locking block 506 and the locking sleeve 505 form a locking fit with the locking groove 507a; the lower impact body 508 is a sleeve-shaped column, and an inner convex edge is arranged at the upper end, and the inner convex edge forms a blocking fit with the outer convex edge of the lower end of the extension shaft 502, and the upper end surface is a plurality of arc-shaped concave and convex impact surfaces 508a that roll with the roller 512, and the lower end is fixedly connected to the drill bit joint 509; the spring body 504, the upper impact body 507 and the lower impact body 508 are arranged in the annular space between the external structure and the central structure in sequence from top to bottom.

[0006] The above solution further includes: a centralizing bearing 510 is provided between the centralizer housing 511 and the lower impact body 508 .

[0007] The outer wall of the lower section of the lower impact body 508 is a hard alloy layer 508b; the outer wall of the centralizer shell 511 is axially evenly distributed with multiple straight or spiral arc-section water grooves 511b, the upper and lower ends are connected by threads, and the lower end is a reverse threaded connection.

[0008] A cardan shaft short section 4 is also connected between the motor short section 3 and the vibration transmission shaft short section 5 .

[0009] A spring sleeve 514 is arranged outside the spring body 504 .

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. While outputting torque, it can output axial vibration impact load, which can effectively improve the blocking and sliding state of the drill bit, thereby improving the rock breaking efficiency of the drill bit for abrasive and brittle formations, and achieving the purpose of increasing the drilling speed of the drilling machine.

[0011] 2. The impact and energy storage process of the vibration impact device is completed simultaneously, which takes up a short time of the motor rotation cycle, and the output impact load is close to the pulse type, which is more effective in improving the jamming and sliding state of the drill bit.

[0012] 3. Its vibration impact device adopts sliding bearing and roller structure, and has an anti-air strike device, which significantly extends the life of the impact device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a full cross-sectional structure diagram of a short section of a vibration transmission shaft of a mechanical vibration impact motor; Figure 2 It is a mechanical vibration impact motor vibration transmission shaft short section housing cutaway structure diagram; Figure 3 yes Figure 1 Cross-section at AA; Figure 4 It is the structural diagram of the lower impact body; Figure 5 It is the structural diagram of the upper impact body; Figure 6 This is the structural diagram of the centralizer shell.

[0014] In the above figure: bypass valve 1, anti-drop short section 2, motor short section 3, universal shaft short section 4, vibration transmission shaft short section 5, output shaft 501, extension shaft 502, spring housing 503, spring body 504, locking sleeve 505, locking block 506, upper impact body 507, lower impact body 508, drill bit joint 509, straightening bearing 510, straightening device housing 511, roller 512, roller cover 513, spring sleeve 514, series bearing housing 515, series bearing 516, concave impact surface 508a, carbide layer 508b, locking groove 507a, guide groove 507b, roller shaft 507c, outer guide groove 511a, water tank 511b. DETAILED DESCRIPTION

[0015] like Figure 1 , Figure 2 As shown, a mechanical vibration impact motor mentioned in the present invention comprises a bypass valve 1, an anti-drop short section 2, a motor short section 3, a universal shaft short section 4 and a vibration transmission shaft short section 5. The bypass valve 1, the anti-drop short section 2, the motor short section 3 and the universal shaft short section 4 are conventional screw motor components.

[0016] The vibration transmission shaft short section 5 includes an output shaft 501, an extension shaft 502, a spring housing 503, a spring body 504, a locking sleeve 505, a locking block 506, an upper impact body 507, a lower impact body 508, a drill head joint 509, a straightening bearing 510, a straightening device housing 511, a roller 512, a roller cover 513, a spring sleeve 514, a series bearing housing 515 and a series bearing 516. The series bearing housing 515, the series bearing 516 and the upper structure of the output shaft 501 are the same as those of a conventional screw motor. The spring housing 503, the straightening device housing 511 and the straightening bearing 510 are threadedly connected to the series bearing housing 515 in sequence and are stationary relative to the motor housing. The lower end 501 of the output shaft is threadedly connected to the upper end of the extension shaft 502, and the lower end of the extension shaft 502 is splined to the upper end of the drill head joint 509. The extension shaft 502 can transmit torque to the drill head joint 509 and can produce relative displacement in the axial direction. The upper part of the upper impact body 507 is combined with the locking block 506 and the locking sleeve 505 to form a closed guide groove 507b, which cooperates with the outer guide groove 511a of the centralizer housing 511. It can only move axially up and down, and the displacement size is limited. The rollers 512 with sliding bearings are evenly distributed around the lower circumference. The lower part of the lower impact body 508 is threadedly fixedly connected to the middle part of the drill bit joint 509, and the inner convex edge of the upper end can be suspended on the outer convex edge of the lower part of the extension shaft 502 to support the weight of the drill bit and the drill bit joint 509. The upper end surface is evenly distributed with arc-shaped concave impact surfaces 508a with the same number as the rollers. Since the spring body 504 is arranged on the upper impact body 507 to store pre-pressure, when the roller 512 rolls relatively along the upper end surface of the lower impact body 508, an axial impact force is generated when passing through the arc-shaped concave impact surface 508a. The impact force is applied to the drill bit joint 509 and the drill bit. As the drill bit joint 509 continues to rotate, the lower impact body 508 is impacted by the roller, and the motor continuously outputs a vibration impact load.

[0017] The drill bit joint 509 is a hollow rotating body with a drilling fluid flow channel in the middle. The inner side of the lower part is a drill bit connecting thread, the outer side of the middle part is a connecting thread for fixed connection with the lower impact body, and the outer side of the upper part is an external spline that cooperates with the internal spline of the extension shaft.

[0018] The extended shaft 502 is a hollow cylinder with a slightly thicker lower end, a drilling fluid flow channel in the middle, a convex edge surface on the lower thick end for hanging the lower impact body, an inner spline on the inside, which cooperates with the outer spline of the drill bit joint, and a connecting thread on the outer side of the upper part, which is fixedly connected to the output shaft.

[0019] like Figure 4 As shown, the lower impact body 508 is a sleeve-shaped cylinder, the middle of the upper end is a through hole with a slightly smaller diameter, the upper end surface is the roller rolling contact surface, and multiple arc-shaped concave impact surfaces 508a are evenly distributed circumferentially. The inner convex edge surface of the upper end is used for hanging and bearing, the inner hole of the lower section is a connecting thread for connecting a drill bit joint, and the outer wall of the lower section is a carbide layer 508b used as the inner ring of the straightening bearing.

[0020] like Figure 5 As shown, the upper impact body 507 is a barrel-shaped body with a slightly thicker lower portion and an open spline groove structure on the upper portion. The lower section of the barrel has evenly distributed annular grooves on the side surface facing inward. The distance between the center of the ring and the lower end face is smaller than the radius of the outer circle of the ring, and the difference is larger than the depth of the circular arc depression of the lower impact body. The middle cylinder of the annular groove is the roller shaft 507c. The middle of the roller shaft 507c is a threaded hole for connecting the roller cover. The upper section has evenly distributed open guide grooves 507b that penetrate the wall. On both sides of each guide groove 507b near the upper end face are locking grooves 507a for connecting locking blocks to form a closed guide structure. The closed guide structure is used to guide the upper impact body and only moves up and down and limits the displacement.

[0021] like Figure 6 As shown, a plurality of straight or spiral arc-section water grooves 511b are evenly distributed axially on the outer side of the centralizer shell 511, a connecting thread is provided on the outer side of the upper end, a reverse-thread connecting thread is provided on the inner side of the lower end, a through hole with a slightly smaller diameter is provided in the middle of the upper end, and a plurality of rectangular outer guide grooves 511a are evenly distributed radially on the inner wall of the through hole, which pass through the upper end surface to the lower convex edge and cooperate with the upper impact body guide groove 507b.

[0022] The use process of this mechanical vibration impact motor is as follows: The lower end of the mechanical vibration impact motor is connected to the PDC drill bit, which is matched to the lowest end of the drilling pipe. In the suspended state, the drill bit and the drill bit joint 509 are suspended on the lower rough end of the extension shaft 502 through the lower impact body 508, and the internal spline structure of the extension shaft 502 is meshed with the external spline of the drill bit joint 509. In this state, the drilling fluid is circulated, and the motor outputs torque but does not output impact; after drilling to the bottom of the well and applying drilling pressure, the end face of the extension shaft 502 contacts the convex edge surface of the lower part of the external spline of the drill bit joint 509, and the upper end face of the lower impact body 508 contacts the roller 512, and compresses the spring body 504 to store energy. In this state, the drilling fluid is circulated, the motor outputs torque, and the roller 512 rolls in a circle relative to the upper end face of the lower impact body 508. When passing through the arc concave impact surface 508a, the energy stored in the spring body 504 is released and an impact is generated at the same time to re-store energy. The impact and energy storage processes are completed at the same time, and a pulse impact load is output.

Claims

1. A mechanical vibration impact motor, comprising a motor short section (3) and a vibration transmission shaft short section (5), wherein the vibration transmission shaft short section (5) comprises a series bearing housing (515), a series bearing (516) and an output shaft (501) arranged in the series bearing housing (515), wherein the series bearing (516) and the output shaft (501) are characterized in that The invention also comprises: an extension shaft (502), a spring housing (503), a spring body (504), a locking sleeve (505), a locking block (506), an upper impact body (507), a lower impact body (508), a drill head joint (509), a centralizer housing (511) and a roller (512); the upper end of the spring housing (503) is fixedly connected to the series bearing housing (515), and the lower end is fixedly connected to the centralizer housing (511) to form an external structure; the top of the drill head joint (509) is a spline, the middle part is an external connection thread, and the lower part is provided with a drill head thread; the extension shaft (502) The centralizer shell (511) is a hollow body, the upper end of which is fixedly connected to the output shaft (501), the lower end of which is provided with an outer convex edge, and the lower end of which is spline-connected to the top of the drill bit joint (509) to form a central structure; the middle of the upper part of the centralizer shell (511) is a through hole with a reduced diameter, and the inner wall of the through hole is evenly distributed with 2-6 rectangular guide grooves (511a) in the circumferential direction; the upper impact body (507) is a cylinder with a slightly thicker lower part and an open keyway structure in the upper part, and the outer surface of the thick cylinder wall of the lower section of the cylinder is evenly distributed with 2-6 arc grooves inwardly in the circumferential direction, and the roller (512) is connected to each arc groove through a roller shaft (507c), and the upper part of the cylinder is provided with a roller shaft (507c) connected to the roller shaft (507c). The rectangular guide groove (511a) on the inner wall of the through hole of the centralizer housing (511) is axially plugged into an open guide groove (507b), and locking grooves (507a) are arranged on both sides of the upper end of each guide groove (507b), and the locking block (506) and the locking sleeve (505) form a locking fit with the locking groove (507a); the lower impact body (508) is a sleeve-shaped column, and an inner convex edge is arranged at the upper end, and the inner convex edge forms a blocking fit with the outer convex edge of the lower end of the extension shaft (502); the upper end surface is a plurality of arc-shaped concave-convex impact surfaces (508a) that are rollingly matched with the roller (512); the lower impact body (508) is a sleeve-shaped column, and an inner convex edge is arranged at the upper end, and the inner convex edge forms a blocking fit with the outer convex edge of the lower end of the extension shaft (502); the upper end surface is a plurality of arc-shaped concave-convex impact surfaces (508a) that are rollingly matched with the roller (512); The end is fixedly connected to the drill bit joint (509); the spring body (504), the upper impact body (507) and the lower impact body (508) are arranged in sequence from top to bottom in the annular space between the external structure and the central structure; a centralizing bearing (510) is provided between the centralizer shell (511) and the lower impact body (508); the outer wall of the lower section of the lower impact body (508) is a hard alloy layer (508b); the outer wall of the centralizer shell (511) is axially evenly distributed with a plurality of straight or spiral arc-section water grooves (511b), the upper end and the lower end are connected by threads, and the lower end is a reverse-threaded connection.

2. A mechanical vibration impact motor according to claim 1, characterized in that: A universal shaft short section (4) is also connected between the motor short section (3) and the vibration transmission shaft short section (5).

3. The mechanical vibration impact motor according to claim 1, characterized in that: A spring sleeve (514) is arranged outside the spring body (504).

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