Universal rotation guide shoe

Abstract

The present application relates to the technical fields of downhole operation, and discloses a universal rotation leading shoe, which comprises a leading shoe body, a universal rotation ball, a limiting seat and a flow guide seat, the inner side of the lower end of the leading shoe body is provided with the universal rotation ball which can rotate, the inner side of the middle part of the leading shoe body is fixedly provided with the limiting seat which is located above the universal rotation ball, the lower end of the limiting seat is provided with a hemispherical groove, and the rotating support is located in the hemispherical groove between the limiting seat and the universal rotation ball; the inner side of the upper end of the limiting seat is fixedly provided with the flow guide seat, and the outer side of the middle part of the leading shoe body corresponding to the position above the limiting seat is provided with a plurality of circulating holes which are through the inside and outside. The present application has the advantages of reasonable and compact structure, convenient use, full-range flexible rotation of the universal rotation ball through the circumferential ball and the spherical ball, fluid guiding to the circulating holes through the flow guide seat, convenient fluid outflow, prevention of sand accumulation, stability, reliability and flexibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole operation, and is a universal rotary guide shoe. BACKGROUND

[0002] With the improvement of oil and gas exploitation technology, the proportion of large displacement wells and horizontal wells is gradually increasing, and most of the wells adopt a small three-opening wellbore structure, with a slanting depth of about 5000 to 7000 m and a horizontal section length of 2000 to 3000 m. During the drilling process of the horizontal section, the well trajectory is adjusted many times, causing the azimuth of the build-up section and the horizontal section to change frequently, the dogleg degree to be large, and the trajectory to be three-dimensional around the obstacle. The annular space between the casing and the well wall is small, and the frictional resistance is large from the build-up point to the bottom of the well. The casing moves forward along the edge after being lowered to the horizontal section, and as the contact area of the horizontal section increases, the friction between the casing and the well wall increases. In addition, during the lowering process, the rock debris is seriously accumulated, and when the lowering friction is greater than the weight of the casing straight section, the casing is difficult to be lowered. The three-dimensional horizontal well has a large azimuth torsion angle, and due to the drag pressure, the gravity of the upper casing is difficult to be transmitted downward, causing the casing to move forward with difficulty.

[0003] A rotary guide shoe is disclosed in Chinese Patent Literature CN103590756B, which comprises a rotary seat and a guide end arranged at the lower end of the rotary seat. The guide end is a hollow structure, and the outer surface thereof is provided with a plurality of blades inclined from top to bottom. Adjacent blades are provided with flow discharge holes leading to the inside of the guide end. A rotary turbine blade is arranged in the guide end and connected by a blade seat. The blade seat is arranged at the top of the guide end. A central hole is arranged in the center of the blade seat, and a hollow column coaxial with the central hole is arranged 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 with the hollow column, and the top of the rotary turbine blade is connected with the blade seat. At least three through holes are arranged on the periphery of the blade seat, and the through holes are respectively arranged between adjacent rotary turbine blades. The rotary guide shoe has the following technical defects: (1) it can only rotate in the circumferential direction by 360 degrees, and cannot realize universal rotation; and (2) it cannot effectively guide the casing to be lowered smoothly in view of the problems of large dogleg degree, casing edge sticking, and large lowering friction. SUMMARY

[0004] The present application provides a universal rotary guide shoe, which overcomes the shortcomings of the prior art and effectively solves the problem of single rotation direction of the existing rotary guide shoe.

[0005] The technical scheme of the present application is realized by the following measures: a universal rotation guide shoe comprises a guide shoe body, a universal rotation ball, a limiting seat and a flow guide seat, the universal rotation ball capable of rotating is limitedly installed at the inner side of the lower end of the guide shoe body, the limiting seat located above the universal rotation ball is fixedly installed at the inner side of the middle part of the guide shoe body, the lower end of the limiting seat is provided with a hemispherical groove, and the rotating support located in the hemispherical groove is arranged between the limiting seat and the universal rotation ball; the flow guide seat is fixedly installed at the inner side of the upper end of the limiting seat, and a plurality of internal-external through circulation holes are arranged at the outer side of the middle part of the guide shoe body corresponding to the position above the limiting seat.

[0006] The following is a further optimization or / and improvement of the above-mentioned technical scheme of the application:

[0007] The limiting groove at the inner side of the lower end of the above-mentioned guide shoe body can be matched with the outer side of the lower part of the universal rotation ball, and the limiting groove is in the shape of a ball socket with a wide upper part and a narrow lower part.

[0008] The above-mentioned can further comprise circumferential balls, the upper inner side of the limiting groove is provided with an installation ring groove, and a plurality of circumferential balls located in the installation ring groove are arranged between the guide shoe body and the universal rotation ball.

[0009] The above-mentioned can further comprise an O-shaped sealing ring, and at least one O-shaped sealing ring is arranged between the universal rotation ball and the guide shoe body corresponding to the position of the lower inner side of the limiting groove.

[0010] The above-mentioned rotating support can be a spherical ball, and a plurality of spherical balls located in the hemispherical groove are arranged between the limiting seat and the universal rotation ball.

[0011] The above-mentioned guide shoe body can be provided with at least one group of circulation hole groups spaced apart from each other in the middle part of the guide shoe body, each group of circulation hole groups comprises at least two circulation holes uniformly distributed along the circumference, and each circulation hole is inclined in the shape of upper inner and lower outer.

[0012] The above-mentioned flow guide seat can comprise a spherical crown part, a circular table part and an installation part, the spherical crown part is fixedly installed at the upper end of the circular table part, the installation part is fixedly installed at the central lower end of the circular table part, four flow guide grooves are uniformly distributed along the circumference at the outer side of the circular table part, and the inner side of each flow guide groove is provided in the shape of smooth transition.

[0013] The present application has the advantages of reasonable and compact structure, convenient use, flexible rotation of the universal rotation ball through the arrangement of the circumferential balls and the spherical balls, guiding of the fluid to the circulation holes through the arrangement of the flow guide seat, convenient flow of the fluid, prevention of sand accumulation, stability, reliability and flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings illustrate the present application. Figure 1 The accompanying drawings illustrate the present application.

[0015] The accompanying drawings illustrate the present application. Figure 2 The accompanying drawings illustrate the present application. Figure 1 The accompanying drawings illustrate the present application.

[0016] Figure 1 is a schematic view of the structure of the guide seat according to the present application. Figure 3 Figure 2 is a schematic view of the structure of the guide seat according to the present application. Figure 1 Figure 3 is a schematic view of the structure of the guide seat according to the present application.

[0017] Figure 4 is a schematic view of the structure of the guide seat according to the present application. Figure 4 Figure 5 is a schematic view of the structure of the guide seat according to the present application. Figure 1 Figure 6 is a schematic view of the structure of the guide seat according to the present application.

[0018] Figure 7 is a schematic view of the structure of the guide seat according to the present application. Figure 5 Figure 8 is a schematic view of the structure of the guide seat according to the present application. Figure 1 Figure 9 is a schematic view of the structure of the guide seat according to the present application.

[0019] The codes in the drawings are as follows: 1 is the body of the guide shoe, 2 is the universal rotation ball, 3 is the limiting seat, 4 is the semispherical groove, 5 is the circulation hole, 6 is the circumferential ball, 7 is the O-shaped sealing ring, 8 is the spherical ball, 9 is the spherical crown, 10 is the circular table, 11 is the mounting part, 12 is the mounting groove, 13 is the guide groove, 14 is the limiting groove, and 15 is the mounting ring groove. DETAILED DESCRIPTION

[0020] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical solution of the present application and the actual situation.

[0021] In the present application, in order to facilitate the description, the relative position relationship of each component is described according to the layout of the drawings in the description, such as the position relationship of front, back, up, down, left, right, etc. is determined according to the layout direction of the drawings in the description. Figure 1

[0022] The present application will be further described below in combination with the examples and the drawings:

[0023] Example 1: as shown in the drawings Figure 1 , 2 ​​As shown in Figures 3, 4, and 5, the omnidirectional rotating guide shoe includes a guide shoe body 1, an omnidirectional rotating ball 2, a limiting seat 3, and a flow guide seat. The omnidirectional rotating ball 2, which can rotate, is limited and installed on the inner side of the lower end of the guide shoe body 1. The limiting seat 3, located above the omnidirectional rotating ball 2, is fixedly installed on the inner side of the middle part of the guide shoe body 1. The lower end of the limiting seat 3 is provided with a hemispherical groove 4. A rotating support member located in the hemispherical groove 4 is provided between the limiting seat 3 and the omnidirectional rotating ball 2. The flow guide seat is fixedly installed on the inner side of the upper end of the limiting seat 3. A number of circulation holes 5, which are internally and externally connected, are provided on the outer side of the middle part of the guide shoe body 1, corresponding to the position above the limiting seat 3. During use, by setting a rotating support component inside the hemispherical groove 4, the universal rotating ball 2 can rotate flexibly in all directions. This reduces the resistance between the casing and the well wall during casing installation and reduces the axial impact force during casing installation, thus smoothly guiding the casing installation and preventing casing wear. By setting a flow guide seat, fluid can be guided to the circulation hole 5, facilitating fluid outflow and preventing sand accumulation. According to requirements, the upper side of the limiting seat 3 is provided with two upward-facing mounting grooves 12. The outer side of the limiting seat 3 and the inner side of the guide shoe body 1 are provided with threads, which facilitates the use of tools to rotate and install it into the guide shoe body 1, so as to fix the limiting seat 3 and the guide shoe body 1 together.

[0024] The above-mentioned omnidirectional rotating guide shoe can be further optimized and / or improved according to actual needs:

[0025] Example 2: As shown in the attached document Figure 1 , 5 As shown, a limiting groove 14 is provided on the lower inner side of the shoe guide body 1, which matches the lower outer side of the universal rotating ball 2. The limiting groove 14 is a ball-shaped groove that is wider at the top and narrower at the bottom. During use, this design facilitates the rotation of the universal rotating ball 2 at the lower end of the shoe guide body 1.

[0026] Example 3: As shown in the attached document Figure 1 , 5 As shown, it also includes circumferential balls 6, and an installation ring groove 15 is provided on the inner side of the upper part of the limiting groove 14. Several circumferential balls 6 are provided between the shoe body 1 and the universal rotating ball 2, located in the installation ring groove 15. During use, by setting the circumferential balls 6, the friction force when the universal rotating ball 2 rotates circumferentially is reduced.

[0027] Example 4: As shown in the appendix Figure 1 , 5 As shown, it also includes an O-ring seal 7. At least one O-ring seal 7 is provided between the universal rotating ball 2, which is located on the lower inner side of the limiting groove 14, and the shoe body 1. During use, by setting the O-ring seal 7 below the mounting ring groove 15, it is possible to prevent debris from entering the hemispherical groove 4 and affecting the rotation of the universal rotating ball 2.

[0028] Example 5: As shown in the attached document Figure 1As shown, the rotating support is a spherical ball 8, and a plurality of spherical balls 8 are arranged in the semispherical groove 4 between the limiting seat 3 and the universal rotating ball 2. In use, the universal rotating ball 2 is realized to rotate in all directions by arranging the plurality of spherical balls 8 and cooperating with the circumferential ball 6, so that the resistance between the casing and the well wall can be reduced when the casing is lowered, and the axial impact force in the casing lowering process is reduced, thereby smoothly guiding the casing to be lowered and preventing the casing from being worn.

[0029] Embodiment 6: as shown in the accompanying Figure 1 As shown, at least one group of circulating hole groups is arranged on the outer side of the middle part of the guide shoe body 1, each group of circulating hole groups includes at least two circumferentially spaced and uniformly distributed circulating holes 5, and each circulating hole 5 is inclined in an upper inner and lower outer shape. In use, the circulation of fluid is realized by arranging a plurality of circulating holes 5 to prevent sand accumulation.

[0030] Embodiment 7: as shown in the accompanying Figure 1 , 2 As shown in the accompanying, the flow guide seat includes a spherical cap portion 9, a circular table portion 10, and a mounting portion 11, the spherical cap portion 9 is fixedly installed on the upper end of the circular table portion 10, the mounting portion 11 is fixedly installed on the central lower end of the circular table portion 10, four flow guide grooves 13 are circumferentially and uniformly distributed on the outer side of the circular table portion 10, and the inner side of the flow guide groove 13 is arranged in a smooth transition shape. In use, the fluid can be guided to the circulating hole 5 by arranging four flow guide grooves 13 on the flow guide seat, which facilitates the outflow of fluid and prevents sand accumulation. According to the needs, each group of circulating hole groups includes four circumferentially spaced and uniformly distributed circulating holes 5, and the positions of the four flow guide grooves 13 correspond to the positions of the four circulating holes 5.

[0031] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A universal rotating shoe, characterized in that... The system includes a shoe guide body, a rotatable swivel ball, a limiting seat, and a flow guide seat. A rotatable swivel ball is fixedly installed on the inner side of the lower end of the shoe guide body. A limiting seat is fixedly installed on the inner side of the middle part of the shoe guide body, located above the rotatable swivel ball. The lower end of the limiting seat has a hemispherical groove, and a rotating support component is located within the hemispherical groove between the limiting seat and the rotatable swivel ball. A flow guide seat is fixedly installed on the inner side of the upper end of the limiting seat. Several through-hole circulation holes are provided on the outer side of the middle part of the shoe guide body, corresponding to the position above the limiting seat. A limiting groove, which is wider at the top and narrower at the bottom, matches the inner side of the lower end of the shoe guide body. The limiting groove is a spherical groove. The system also includes circumferential ball bearings, with a mounting bracket on the inner side of the upper part of the limiting groove. The shoe body is provided with several circumferential balls located in the mounting ring groove between the shoe body and the universal rotating ball; the rotating support is a spherical ball, and the limiting seat is provided with several spherical balls located in the hemispherical groove between the universal rotating ball; at least one set of circulation holes is provided at intervals on the outer side of the middle part of the shoe body, and each set of circulation holes includes at least two circulation holes evenly distributed along the circumference, and each circulation hole is inclined in an upward-inward and downward-outward shape; the guide seat includes a spherical crown, a frustum and a mounting part, the spherical crown is fixedly installed at the upper end of the frustum, the mounting part is fixedly installed at the center of the lower end of the frustum, and four guide grooves are evenly distributed along the circumference on the outer side of the frustum, and the inner side of the guide grooves is smoothly transitioned.

2. The omnidirectional rotating guide shoe according to claim 1, characterized in that... It also includes O-rings, with at least one O-ring between the universal rotating ball at the lower inner position of the limiting groove and the shoe body.

Images