Universal rotary guiding shoe

Abstract

The invention relates to the technical field of underground operation, in particular to a universal rotating guiding shoe which comprises a guiding shoe body, a universal rotating ball, a limiting seat and a flow guiding seat, the universal rotating ball capable of rotating is installed on the inner side of the lower end of the guiding shoe body in a limiting mode, and the limiting seat located above the universal rotating ball is fixedly installed on the inner side of the middle of the guiding shoe body. A semispherical groove is formed in the lower end of the limiting seat, and a rotating supporting piece located in the semispherical groove is arranged between the limiting seat and the universal rotating ball; a plurality of circulating holes which are through inside and outside are formed in the outer side of the middle part of the guiding shoe body corresponding to the position above the limiting seat. The universal rotating ball is reasonable and compact in structure and convenient to use, and all-directional flexible rotation of the universal rotating ball is achieved by arranging the circumferential balls and the spherical balls; by arranging the flow guide seat, the fluid can be guided to the circulating hole, the fluid can flow out conveniently, settled sand is prevented from being accumulated, and the device has the advantages of being stable, reliable and flexible.

Description

Technical Field

[0001] The invention relates to the technical field of underground operation and is a universal rotating guide shoe. Background Art

[0002] With the improvement of oil and gas production technology, the proportion of extended reach wells and horizontal wells has gradually increased. Most wells use a small three-opening wellbore structure with an inclined depth of about 5000 to 7000m and a horizontal section length of 2000m to 3000m. During the horizontal section drilling process, the wellbore trajectory is adjusted many times, resulting in many changes in the azimuth of the inclination section and the horizontal section, a large dogleg degree, and a three-dimensional obstacle-circling trajectory. The annular space between the casing and the wellbore is small, and the area from the inclination point to the bottom of the well is in the open hole formation, with large friction resistance. After the casing is lowered to the horizontal section, it moves forward along the edge. As the contact area of ​​the horizontal section increases, the friction resistance between the casing and the wellbore increases. In addition, the rock debris accumulates seriously during the lowering process. When the lowering friction resistance is greater than the weight of the vertical section of the casing, the casing is difficult to lower. The azimuth torsion angle of the three-dimensional horizontal well is large. In the later stage of the casing lowering, the gravity of the upper casing is difficult to transfer downward due to the drag pressure, making it difficult for the casing to move forward.

[0003] The Chinese patent document with the announcement number CN103590756B discloses a rotary guide shoe, which includes a rotary seat and a guide end arranged at the lower end of the rotary seat, the guide end is a hollow structure, and its outer surface is provided with a plurality of blades inclined from top to bottom, and a discharge hole leading to the inside of the guide end is provided between adjacent blades; a rotary turbine blade connected through a blade seat is provided inside the guide end; the blade seat is provided at the top of the guide end; a center hole is provided at the center of the blade seat, and a hollow column coaxial with the center hole is provided on the bottom surface of the blade seat, the rotary turbine blade is at least three, and the inner end of the rotary turbine blade is connected to the hollow column, and the top of the rotary turbine blade is connected to the blade seat; at least three through holes are provided around the blade seat, and the through holes are respectively placed between adjacent rotary turbine blades. The rotary guide shoe has the following technical defects: (1) it can only rotate 360 ​​degrees in the circumferential direction and cannot achieve universal rotation; (2) it cannot effectively play the role of rotating and guiding the casing to be smoothly lowered in view of problems such as large dogleg, casing edge contact, and large lowering friction. Summary of the invention

[0004] The present invention provides a universal rotating guide shoe, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing rotating guide shoe has a single rotation direction.

[0005] The technical solution of the present invention is achieved through the following measures: a universal rotating guide shoe includes a guide shoe body, a universal rotating ball, a limit seat and a guide seat, a universal rotating ball that can rotate is installed on the inner side of the lower end of the guide shoe body, a limit seat located above the universal rotating ball is fixedly installed on the inner side of the middle part of the guide shoe body, a hemispherical groove is provided at the lower end of the limit seat, and a rotating support member located in the hemispherical groove is provided between the limit seat and the universal rotating ball; a guide seat is fixedly installed on the inner side of the upper end of the limit seat, and a plurality of circulation holes that pass through inside and outside are provided on the outer side of the middle part of the guide shoe body corresponding to the position above the limit seat.

[0006] The following are further optimizations and / or improvements to the above technical solutions: The inner side of the lower end of the guide shoe body can be matched with the outer side of the lower part of the universal rotating ball, and the limiting groove is in the shape of a ball socket with a wide upper part and a narrow lower part.

[0007] The above may also include circumferential balls, a mounting ring groove is provided on the inner side of the upper part of the limiting groove, and a plurality of circumferential balls located in the mounting ring groove are provided between the guide shoe body and the universal rotating ball.

[0008] The above may also include an O-shaped sealing ring, and at least one O-shaped sealing ring is provided between the universal rotating ball at the inner side of the lower part of the limiting groove and the guide shoe body.

[0009] The above-mentioned rotating support member can be a spherical ball, and a plurality of spherical balls located in a hemispherical groove are arranged between the limit seat and the universal rotating ball.

[0010] At least one group of circulation holes may be arranged at intervals on the upper and lower sides of the middle outer side of the guide shoe body, each group of circulation holes includes at least two circulation holes evenly spaced along the circumference, and each circulation hole is inclined in an upper inner and lower outer shape.

[0011] The above-mentioned guide seat may include a spherical crown portion, a truncated cone portion and a mounting portion. The spherical crown portion is fixedly mounted on the upper end of the truncated cone portion, and the mounting portion is fixedly mounted on the center of the lower end of the truncated cone portion. Four guide grooves are evenly distributed along the circumference on the outer side of the truncated cone portion, and the inner sides of the guide grooves are arranged in a smooth transition shape.

[0012] The invention has a reasonable and compact structure and is easy to use. By arranging circumferential balls and spherical balls, the universal rotating ball can be flexibly rotated in all directions. By arranging a guide seat, the fluid can be guided to the circulation hole to facilitate the outflow of the fluid and prevent sand accumulation. It has the characteristics of stability, reliability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the front view and half-section structure of embodiments 1 to 7 of the present invention.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the enlarged structure of the center guide seat from top view.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle guide seat.

[0016] Attached Figure 4 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle limit seat.

[0017] Attached Figure 5 For attachment Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] The codes in the accompanying drawings are: 1 is the guide shoe body, 2 is the universal rotating ball, 3 is the limit seat, 4 is the hemispherical groove, 5 is the circulation hole, 6 is the circumferential ball, 7 is the O-ring, 8 is the spherical ball, 9 is the ball crown, 10 is the truncated cone, 11 is the mounting part, 12 is the mounting groove, 13 is the guide groove, 14 is the limit groove, and 15 is the mounting ring groove. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0021] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown in Figures 3, 4 and 5, the universal rotating guide shoe comprises a guide shoe body 1, a universal rotating ball 2, a limit seat 3 and a guide seat. A rotatable universal rotating ball 2 is limitedly installed on the inner side of the lower end of the guide shoe body 1, a limit seat 3 located above the universal rotating ball 2 is fixedly installed on the inner side of the middle part of the guide shoe body 1, a hemispherical groove 4 is provided at the lower end of the limit seat 3, and a rotating support member located in the hemispherical groove 4 is provided between the limit seat 3 and the universal rotating ball 2; a guide seat is fixedly installed on the inner side of the upper end of the limit seat 3, and a plurality of circulation holes 5 that pass through inside and outside are provided on the outer side of the middle part of the guide shoe body 1 corresponding to the position above the limit seat 3. During use, by setting a rotating support in the hemispherical groove 4, the universal rotating ball 2 can be rotated flexibly in all directions, which can reduce the resistance between the casing and the well wall when lowering the casing, and reduce the axial impact force during the lowering of the casing, so as to smoothly guide the lowering of the casing and prevent the casing from being worn; by setting a guide seat, the fluid can be guided to the circulation hole 5, which is convenient for the fluid to flow out and prevents the accumulation of sand. According to the needs, two installation grooves 12 with upward openings are provided on the upper side of the limit seat 3, and the outer side of the limit seat 3 and the inner side of the guide shoe body 1 are provided with threads, so that it is easy to use a tool to rotate it into the guide shoe body 1, so that the limit seat 3 and the guide shoe body 1 are fixedly installed together.

[0022] The above universal rotating guide shoe can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 5 As shown, the inner side of the lower end of the guide shoe body 1 matches the outer side of the lower part of the universal rotating ball 2, and the limiting groove 14 is in a ball-shaped shape with a wide top and a narrow bottom. In use, through such an arrangement, it is convenient for the universal rotating ball 2 to rotate at the lower end of the guide shoe body 1.

[0023] Embodiment 3: As attached Figure 1 , 5 As shown, it also includes circumferential balls 6, a mounting ring groove 15 is provided on the inner side of the upper part of the limiting groove 14, and a plurality of circumferential balls 6 located in the mounting ring groove 15 are provided between the guide shoe body 1 and the universal rotating ball 2. During use, the circumferential balls 6 are provided to reduce the friction force when the universal rotating ball 2 rotates circumferentially.

[0024] Embodiment 4: As attached Figure 1 , 5 As shown, an O-ring 7 is also included, and at least one O-ring 7 is provided between the universal rotating ball 2 and the guide shoe body 1 at the inner position of the lower part of the limiting groove 14. During use, the O-ring 7 located below the mounting ring groove 15 is provided to prevent debris from entering the hemispherical groove 4 and affecting the rotation of the universal rotating ball 2.

[0025] Embodiment 5: As attached Figure 1As shown, the rotating support is a spherical ball 8, and a plurality of spherical balls 8 located in the hemispherical groove 4 are arranged between the limit seat 3 and the universal rotating ball 2. During use, by providing a plurality of spherical balls 8 and cooperating with the circumferential balls 6, the universal rotating ball 2 can rotate in all directions, which can reduce the resistance between the casing and the well wall when lowering the casing, and reduce the axial impact force during the casing lowering process, thereby smoothly guiding the lowering of the casing and preventing the casing from being worn.

[0026] Embodiment 6: As attached Figure 1 As shown, at least one group of circulation holes is arranged at intervals on the upper and lower sides of the middle outer side of the guide shoe body 1, each group of circulation holes includes at least two circulation holes 5 evenly spaced along the circumference, and each circulation hole 5 is inclined in an upper inner and lower outer shape. During use, by setting a plurality of circulation holes 5, the circulation of the fluid is realized to prevent the accumulation of sand.

[0027] Embodiment 7: As attached Figure 1 , 2 As shown in Figure 3, the guide seat includes a spherical crown portion 9, a truncated cone portion 10 and a mounting portion 11. The spherical crown portion 9 is fixedly mounted on the upper end of the truncated cone portion 10, and the mounting portion 11 is fixedly mounted at the center of the lower end of the truncated cone portion 10. Four guide grooves 13 are evenly spaced along the circumference on the outer side of the truncated cone portion 10, and the inner sides of the guide grooves 13 are arranged in a smooth transition shape. During use, by arranging four guide grooves 13 on the guide seat, the fluid can be guided to the circulation hole 5, which is convenient for the fluid to flow out and prevents the accumulation of sand. According to the needs, each group of circulation holes includes four circulation holes 5 evenly spaced along the circumference, and the positions of the four guide grooves 13 correspond to the positions of the four circulation holes 5.

[0028] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A universal rotating guide shoe, characterized in that It includes a guide shoe body, a universal rotating ball, a limit seat and a guide seat. A rotatable universal rotating ball is installed on the inner side of the lower end of the guide shoe body. A limit seat located above the universal rotating ball is fixedly installed on the inner side of the middle part of the guide shoe body. A hemispherical groove is provided at the lower end of the limit seat. A rotating support member located in the hemispherical groove is provided between the limit seat and the universal rotating ball. A guide seat is fixedly installed on the inner side of the upper end of the limit seat, and a plurality of circulation holes that pass through inside and outside are provided on the outer side of the middle part of the guide shoe body corresponding to the position above the limit seat.

2. The universal rotating guide shoe according to claim 1, characterized in that The inner side of the lower end of the guide shoe body matches the outer side of the lower part of the universal rotating ball, and the limiting groove is in a ball socket shape that is wide at the top and narrow at the bottom.

3. The universal rotating guide shoe according to claim 2 is characterized in that It also includes circumferential balls, a mounting ring groove is arranged on the inner side of the upper part of the limiting groove, and a plurality of circumferential balls located in the mounting ring groove are arranged between the guide shoe body and the universal rotating ball.

4. The universal rotating guide shoe according to claim 2 or 3, characterized in that It also includes an O-shaped sealing ring. At least one O-shaped sealing ring is arranged between the universal rotating ball at the inner side of the lower part of the limiting groove and the guide shoe body.

5. The universal rotating guide shoe according to claim 1, 2 or 3, characterized in that The rotating support is a spherical ball, and a plurality of spherical balls located in hemispherical grooves are arranged between the limit seat and the universal rotating ball.

6. The universal rotating guide shoe according to claim 4, characterized in that The rotating support is a spherical ball, and a plurality of spherical balls located in hemispherical grooves are arranged between the limit seat and the universal rotating ball.

7. The universal rotating guide shoe according to claim 1, 2, 3 or 6, characterized in that At least one group of circulation holes is arranged at intervals up and down on the outer side of the middle part of the guide shoe body, each group of circulation holes includes at least two circulation holes evenly spaced along the circumference, and each circulation hole is inclined in an upper inner and lower outer shape.

8. The universal rotating guide shoe according to claim 4, characterized in that At least one group of circulation holes is arranged at intervals up and down on the outer side of the middle part of the guide shoe body, each group of circulation holes includes at least two circulation holes evenly spaced along the circumference, and each circulation hole is inclined in an upper inner and lower outer shape.

9. The universal rotating guide shoe according to claim 5, characterized in that At least one group of circulation holes is arranged at intervals up and down on the outer side of the middle part of the guide shoe body, each group of circulation holes includes at least two circulation holes evenly spaced along the circumference, and each circulation hole is inclined in an upper inner and lower outer shape.

10. The universal rotating guide shoe according to claim 1 or 2 or 3 or 6 or 8 or 9, characterized in that The guide seat includes a spherical crown portion, a truncated cone portion and a mounting portion. The spherical crown portion is fixedly mounted on the upper end of the truncated cone portion, and the mounting portion is fixedly mounted on the center of the lower end of the truncated cone portion. Four guide grooves are evenly spaced along the circumference on the outer side of the truncated cone portion, and the inner sides of the guide grooves are arranged in a smooth transition shape.

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