CN117948061A

CN117948061A - Sleeve guide shoe

Info

Publication number: CN117948061A
Application number: CN202211296956.1A
Authority: CN
Inventors: 牛保伦; 周战云; 付波; 刘华俊; 司开利; 张�诚; 包振江
Original assignee: Sinopec Puyang Gas Storage Co ltd; China Petroleum and Chemical Corp; Well Cementation Co of Sinopec Zhongyuan Petroleum Engineering Co Ltd; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Current assignee: Sinopec Puyang Gas Storage Co ltd; China Petroleum and Chemical Corp; Well Cementation Co of Sinopec Zhongyuan Petroleum Engineering Co Ltd; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2024-04-30

Abstract

The invention relates to the technical field of casing boots, in particular to a casing boot, which comprises a barrel, wherein a water hole is arranged on the barrel, and the casing boot is characterized in that a reverse jet hole is arranged on the barrel wall of the barrel, the inner end of the reverse jet hole is communicated with the inner cavity of the barrel, and the outer end of the reverse jet hole forms a jet hole which is vertically upward or obliquely upward, so that when the well flushing operation is carried out, flushing fluid enters the casing boot at the bottom from top to bottom, one part of the fluid can be sprayed from the water hole at the bottom to the space at the bottom of the barrel to impact and suspend rock fragments at the bottom of a well hole, and the other part of the fluid can be sprayed from the reverse jet hole on the barrel wall to the upper well hole annulus to form a supporting effect on the rock fragments suspended in the upper annulus, thereby preventing the rock fragments at the upper annulus from depositing to the bottom of the well and being beneficial to improving the well flushing efficiency.

Description

Sleeve guide shoe

Technical Field

The invention relates to the technical field of casing boots, in particular to a casing guide shoe.

Background

Before the well cementation operation of petroleum well drilling, firstly, a casing string with a guide shoe at the bottom is required to be put into a well hole, then, circulation well flushing is carried out to carry out rock fragments in the well, in the well cementation process, well cementation liquid is required to be capable of effectively flushing the well wall to clear filter cakes, so that the cementing quality of a cement sheath is ensured, wherein the well flushing liquid and the well cementation liquid are sprayed into an annular space between the casing and the well wall from the water hole on the guide shoe at the bottom of the casing, and then, the well cementation liquid is returned from the annular space.

The Chinese patent publication No. CN210622732U and publication No. 2020, discloses a shoe-guiding device with sleeve, which has a main body of a cylinder body, the cylinder body comprises an annular cylinder wall and a cylinder bottom at one end of the cylinder wall, the cylinder bottom is closed, and the cylinder bottom is provided with downward holes to form water holes. When the casing guide shoe is used for flushing, the flushing liquid is sprayed downwards through the water hole to clamp rock fragments, however, when the rock fragments are more and the fragments are larger, the casing guide shoe is easy to deposit to the bottom of the well, is not easy to be carried out by the flushing liquid in a circulating way, and influences the flushing efficiency.

Disclosure of Invention

The invention aims to provide a casing guide shoe, which solves the problem that rock scraps are easy to deposit to the bottom of a well to influence the well washing efficiency when the existing casing guide shoe is used.

The technical scheme of the sleeve guide shoe is as follows:

The sleeve guide shoe comprises a barrel, wherein a water hole is formed in the barrel, a reverse jet hole is formed in the barrel wall of the barrel, the inner end of the reverse jet hole is communicated with the inner cavity of the barrel, a jet hole is formed in the outer end of the reverse jet hole, and the jet hole faces vertically upwards or obliquely upwards so as to be upwards ejected through the reverse jet hole when liquid enters the sleeve guide shoe.

The beneficial effects are that: the invention improves on the basis that the bottom of the casing guide shoe in the prior art is provided with the water hole, and the cylinder wall is additionally provided with the reverse jet hole, so that when the well flushing operation is carried out, well flushing liquid enters the casing guide shoe at the bottom from top to bottom, part of liquid can be jetted into the space at the bottom of the cylinder bottom from the water hole at the bottom, impact and suspend the rock fragments at the bottom of the well hole, and the other part of liquid can be jetted upwards to the annular space of the well hole at the upper part from the reverse jet hole on the cylinder wall, thereby forming a lifting effect on the rock fragments suspended in the annular space at the upper part, preventing the rock fragments of the annular space at the bottom of the well from depositing to the well, and being beneficial to improving the well flushing efficiency.

Further, the center line of the jet port is different from the axis of the cylinder.

The beneficial effects are that: after the liquid is sprayed out from the jet outlet, a component force is generated along the circumferential direction of the cylinder body, so that a turbulent flow field is formed in the upper annular space, the liquid returns upwards in a spiral turbulent flow state in the annular space, the flushing capability of the liquid on the well wall can be enhanced under the action of centrifugal force, the filter cake on the well wall is effectively removed, and the cementing quality of the water mud ring is ensured.

Further, the jet port is inclined upwards and is opposite to the axis of the cylinder, a surface perpendicular to the central line of the jet port is taken as a first surface, a surface perpendicular to the axis of the cylinder is taken as a second surface, and an included angle between the first surface and the second surface is between 30 degrees and 60 degrees.

The beneficial effects are that: the included angle between the first surface and the second surface is controlled to be 30-60 degrees, so that the scouring capability and the upward sand carrying capability of fluid sprayed from the jet orifice to the well wall are both in an optimal state.

Further, the inner cavity of the cylinder body comprises a large cavity section and a small cavity section which are axially distributed along the cylinder body, the small cavity section of the large cavity section is close to the cylinder bottom of the cylinder body, an inner step surface facing the cylinder bottom of the cylinder body is arranged at the joint of the large cavity section and the small cavity section, and an inner end orifice of the reverse jet hole is positioned on the inner step surface.

The beneficial effects are that: the reverse jet hole is formed in the inner step surface of the transition part of the large cavity section and the small cavity section, so that the liquid in the large cavity section is favorably ejected upwards, and the inclined reverse jet hole is conveniently processed.

Further, the outer wall surface of the barrel wall of the barrel is provided with an outer step surface which is back to the barrel bottom of the barrel, and the jet mouth of the reverse jet hole is positioned on the outer step surface.

The beneficial effects are that: the jet port of the reverse jet hole is arranged on the outer step surface, so that drilling operation is convenient.

Further, the outer step surface is a conical surface.

The beneficial effects are that: the inclined reverse jet hole is machined by utilizing the conical surface, so that the open area of the outer orifice of the reverse jet hole is reduced.

Further, a groove is formed in the outer wall surface of the barrel wall of the barrel, the groove is provided with two side groove wall surfaces which are opposite along the axial direction of the barrel, one side groove wall surface, close to the barrel bottom of the barrel, of the two side groove wall surfaces is a first groove wall surface, one side groove wall surface, far away from the barrel bottom of the barrel, is a second groove wall surface, and the first groove wall surface forms an outer step surface.

The beneficial effects are that: the groove is formed in the cylinder body, so that an outer step surface is formed by the groove wall of the groove, and meanwhile, the parts of the cylinder body, which are positioned on the two sides of the groove, can be thicker, so that the connection of the cylinder opening of the cylinder body and the sleeve is facilitated.

Further, the first groove wall surface is a conical surface, and an included angle between a bus of the first groove wall surface and the axis is between 45 degrees and 60 degrees.

The beneficial effects are that: by controlling the included angle between the bus of the first groove wall surface and the axis to be 45-60 degrees, the jet orifice capable of jetting fluid with the optimal scouring state to the well wall can be conveniently processed.

Further, the second groove wall surface is a conical surface, and a bus bar of the first groove wall surface is perpendicular to a bus bar of the coplanar second groove wall surface which is positioned on the same side of the axis of the cylinder.

The beneficial effects are that: by the arrangement, the fluid sprayed by the jet orifice can be prevented from contacting the wall surface of the second groove to weaken the optimal annular flow state.

Further, the reverse jet holes are arranged in a plurality along the circumferential direction of the cylinder body, and the ratio of the flow area of the water hole to the sum of the flow areas of the jet holes is between 0.25 and 0.35.

The beneficial effects are that: ensuring that the port has sufficient injection pressure and injection pressure of the reverse jet orifice.

Drawings

FIG. 1 is a schematic view of the construction of example 1 of the sleeve guide of the present invention;

FIG. 2 is a half cross-sectional view of FIG. 1;

Fig. 3 is a perspective view of fig. 1.

In the figure: 1. an upper body; 2. a lower body; 11. a first groove wall surface; 12. a reverse jet hole; 13. a small cavity section; 14. a second groove wall surface; 15. a threaded bore section; 21. and (5) water hole.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

It is noted that relational terms such as "first" and "second" and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the inclusion of an element as defined by the statement "comprising" or "comprises" or the like that may occur does not preclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.

In the description of the present invention, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.

The present invention is described in further detail below with reference to examples.

Example 1 of the inventive sleeve guide:

As shown in fig. 1,2 and 3, the casing guide comprises a cylinder body, the axis of the cylinder body extends up and down, the cylinder body comprises an upper body 1 and a lower body, the upper body 1 is in threaded connection with the lower body 2, a water hole 21 is arranged at the bottom of the lower body 2, a reverse jet hole 12 is arranged on the upper body 1, and liquid entering the casing guide is jetted downwards from the water hole 21 and jetted from the reverse jet hole 12 to an upper space.

The lower body 2 comprises a cylinder part and a hemispherical part, the hemispherical part forms the bottom of the cylinder, the inner surface and the outer surface of the bottom are hemispherical surfaces, the water hole 21 is arranged at the center of the bottom of the cylinder, the water hole 21 is a through hole which is vertically communicated, and the inner diameter of the water hole 21 is smaller than the inner diameter of the cylinder. The cylindrical part is smoothly connected with the hemispherical part, the cylindrical part is of a step structure and comprises a large-diameter section with a larger outer diameter and a small-diameter section with a smaller outer diameter, the thickness of the large-diameter section is the same as that of the hemispherical part, the small-diameter section is thinner, and external threads are arranged on the outer peripheral surface of the small-diameter section so as to be in threaded connection with the upper body 1.

The upper body 1 is tubular and vertically runs through, the upper body 1 is provided with a central hole, the central hole comprises an upper hole section, a middle hole section and a lower hole section which are distributed along the upper and lower directions, the aperture of the upper hole section and the aperture of the lower hole section are larger than that of the middle hole section, the hole wall surface of the lower hole section is provided with internal threads so as to be connected with external threads on the lower body in an adapting way, the hole wall surface of the upper hole section is provided with internal threads so as to form a threaded hole section 15, and the threaded hole section 15 is used for being connected with a sleeve guide shoe in a threaded way at the bottom of a sleeve.

The outer peripheral surface of the upper body 1 is provided with a groove, the groove is annular, the notch of the groove faces outwards along the radial direction of the cylinder, the wall surface of the lower side groove of the groove is a first groove wall surface 11, the wall surface of the upper side groove is a second groove wall surface 14, the outer diameter of the upper body 1, which is positioned on the upper side and the lower side of the groove, is the same as the outer diameter of the large-diameter section of the cylinder part of the lower body, after the upper body 1 is in threaded connection with the lower body 2, the part, which is positioned above the bottom of the cylinder, of the inner cavity of the lower body forms a large cavity section of the inner cavity of the cylinder, the middle hole section of the upper body 1 forms a small cavity section 13 of the inner cavity of the cylinder, and the large cavity section and the small cavity section 13 are distributed along the axial direction of the cylinder. The cylindrical parts of the upper body 1 and the lower body form the wall of the cylinder.

The first groove wall surface 11 and the second groove wall surface 14 are conical surfaces, and an included angle between a generatrix of the conical surface where the first groove wall surface 11 is positioned and an axis is between 45 degrees and 60 degrees. The generatrix of the conical surface where the first groove wall surface 11 is located is perpendicular to the generatrix of the conical surface where the second groove wall surface 14 which is on the same side of the axis of the cylinder and is coplanar. The first groove wall surface 11 forms an outer step surface on the outer wall surface of the wall of the barrel, the reverse jet hole 12 is arranged on the first groove wall surface 11, the reverse jet hole 12 is a linear extension hole, an inner orifice is formed at the inner end of the reverse jet hole, the inner orifice is communicated with the inner cavity of the barrel, an outer orifice is formed at the outer end of the reverse jet hole, the outer orifice is a jet hole, the outer orifice of the reverse jet hole 12 is positioned on the first groove wall surface 11, and the center line of the jet hole of the reverse jet hole 12 is collinear with the axis of the reverse jet hole.

The joint of the large cavity section and the small cavity section 13 of the cylinder is provided with an inner step surface facing the bottom of the cylinder, the inner step surface is inclined downwards, the inner step surface is a conical surface, and a bus of the conical surface where the inner step surface is positioned is parallel to a bus of the conical surface where the outer step surface is positioned. The inner hole of the reverse jet hole is positioned on the inner step surface, and the outer hole of the reverse jet hole is far away from the bottom of the cylinder body than the inner hole. The reverse jet hole is inclined outwards, the outer hole opening of the reverse jet hole is inclined upwards and faces outwards away from the axis of the cylinder body, a surface perpendicular to the axis of the reverse jet hole is taken as a first surface, a surface perpendicular to the axis of the cylinder body is taken as a second surface, and an included angle between the first surface and the second surface is between 30 degrees and 60 degrees. The reverse jet hole is arranged obliquely outwards at a set angle, so that the jet coverage of the reverse jet hole can be increased, and the ejected water flow is prevented from being blocked.

The axis of the reverse jet hole is different from the axis of the cylinder, a line which passes through the center point of the outer orifice of the reverse jet hole and is perpendicular to the axis of the cylinder is taken as a reference line, and the projection of the axis of the cylinder and the axis of the reverse jet hole in the extending direction of the reference line has a set included angle, so that after the liquid is jetted out from the reverse jet hole, component force can be generated along the circumferential direction of the cylinder, thereby forming a turbulent flow field on the upper annular space, enabling the liquid to return in a spiral turbulent flow state on the annular space, enhancing the scouring capability of the well wall under the action of centrifugal force, and effectively removing the filter cake of the well wall. The reverse jet holes are uniformly distributed along the circumferential direction of the cylinder body to ensure the rotational flow effect, and the ratio of the overflow area of the water hole 21 to the sum of the overflow areas of the jet holes is between 0.25 and 0.35, wherein the overflow area is the cross-sectional area of the hole.

When the device is used, the casing guide shoe is connected to the bottom end of the casing string, the casing string with the casing guide shoe is placed in place in a well hole, circulation well flushing and well cementation operation are carried out, liquid enters the casing guide shoe at the bottom from top to bottom, after the liquid enters the inner cavity of the cylinder body, the liquid ejected from the water hole at the bottom of the casing guide shoe can directly impact and suspend the rock debris at the bottom of the well hole, the liquid ejected from the reverse jet hole can be directly reversely and spirally ejected to the upper well hole annulus, on one hand, the rock debris of the upper annulus can be prevented from depositing to the bottom of the well hole, on the other hand, the annulus can be improved, a strong turbulent flow field is formed at the upper annulus, the liquid returns in the spiral turbulent flow state in the annulus, the flushing capability of the well wall can be enhanced under the action of centrifugal force, the well wall filter cake can be effectively cleared, the cementing quality of the cement ring can be widely applied to well cementation construction operation of various oil and gas wells.

Example 2 of the inventive sleeve guide:

The present embodiment is different from embodiment 1 in that in embodiment 1, an inner step surface facing the bottom of the barrel is provided in the inner cavity of the barrel, and the inner hole of the reverse jet hole is located on the inner step surface. In this embodiment, the inner wall surface of the cylinder wall is a cylindrical surface, and the inner hole of the reverse jet hole is located on the inner wall surface of the cylinder wall and faces the axis of the cylinder.

Example 3 of the inventive sleeve guide:

This embodiment differs from embodiment 1 in that in embodiment 1, the outer wall surface of the cylinder wall of the cylinder has an outer stepped surface facing away from the cylinder bottom of the cylinder, and the outer orifice of the reverse jet hole is located on the outer stepped surface. In this embodiment, the outer circumferential surface of the wall of the cylinder is a cylindrical surface, and the outer orifice of the reverse jet hole is located on the outer circumferential surface of the wall of the cylinder.

Example 4 of the inventive sleeve guide:

This embodiment differs from embodiment 1 in that in embodiment 1, the axis of the reverse jet hole is different from the axis of the cylinder. In this embodiment, the axis of the reverse jet hole and the axis of the cylinder have a set included angle and are coplanar, and the reverse jet hole is inclined outwards.

Example 5 of the inventive sleeve guide:

The difference between this embodiment and embodiment 1 is that in embodiment 1, a groove is provided on the outer wall surface of the barrel wall of the barrel, the groove has two opposite side groove wall surfaces along the axial direction of the barrel, one side groove wall surface of the two side groove wall surfaces, which is close to the barrel bottom of the barrel, is a first groove wall surface, one side groove wall surface, which is far away from the barrel bottom of the barrel, is a second groove wall surface, and the first groove wall surface forms an outer step surface. In this embodiment, the cylinder has a stepped structure, and an outer stepped surface is formed at the transition between the thicker portion and the thinner portion.

Example 6 of the inventive sleeve guide:

This embodiment differs from embodiment 1 in that in embodiment 1, the outer stepped surface is a conical surface, and the backfire hole is inclined outward. In this embodiment, the outer step surface is a plane, the axis of the reverse jet hole is parallel to the axis of the cylinder, and the jet port of the reverse jet hole faces vertically upwards.

Example 7 of the inventive sleeve guide:

this embodiment differs from embodiment 1 in that in embodiment 1, the water hole is provided at the bottom of the cylinder and vertically downward. In this embodiment, the water hole is disposed on the wall of the cylinder and is inclined downward.

It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, but may be modified without inventive effort or equivalent substitution of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The sleeve guide shoe comprises a barrel body, wherein a water hole is formed in the barrel body, and is characterized in that a reverse jet hole is formed in the barrel wall of the barrel body, the inner end of the reverse jet hole is communicated with the inner cavity of the barrel body, a jet hole is formed in the outer end of the reverse jet hole, and the jet hole faces upwards vertically or obliquely upwards so that liquid can be ejected upwards through the reverse jet hole when entering the sleeve guide shoe.

2. The casing guide of claim 1, wherein a centerline of the jet port is out of plane with an axis of the barrel.

3. A casing guide according to claim 1 or claim 2 wherein the jet port is inclined upwardly and away from the axis of the barrel with a face perpendicular to the centre line of the jet port being the first face and a face perpendicular to the axis of the barrel being the second face, the angle between the first face and the second face being between 30 ° and 60 °.

4. A casing guide according to claim 3 wherein the interior cavity of the barrel comprises a large cavity section and a small cavity section axially distributed along the barrel, the large cavity section and the small cavity section being adjacent the barrel bottom of the barrel, the junction of the large cavity section and the small cavity section being provided with an inner stepped surface facing the barrel bottom of the barrel, the inner end orifice of the reverse jet hole being on the inner stepped surface.

5. The casing guide of claim 4, wherein the outer wall surface of the barrel wall of the barrel has an outer stepped surface facing away from the barrel bottom of the barrel, and the jet port of the reverse jet hole is located on the outer stepped surface.

6. The casing guide of claim 5, wherein the outer step surface is a conical surface.

7. The casing shoe according to claim 6, wherein the outer wall surface of the barrel wall of the barrel is provided with a groove, the groove is provided with two side groove wall surfaces which are opposite along the axial direction of the barrel, one side groove wall surface, close to the barrel bottom of the barrel, of the two side groove wall surfaces is a first groove wall surface, one side groove wall surface, far away from the barrel bottom of the barrel, is a second groove wall surface, and the first groove wall surface forms an outer step surface.

8. The casing shoe according to claim 7 wherein the first groove wall surface is conical and the included angle between the generatrix of the first groove wall surface and the axis is between 45 ° and 60 °.

9. The casing shoe of claim 8, wherein the second groove wall surface is a conical surface, and the generatrix of the first groove wall surface is perpendicular to the generatrix of the second groove wall surface on the same side of the cylinder axis and coplanar.

10. A casing guide according to claim 1 or claim 2 wherein a plurality of reverse jet holes are provided circumferentially of the barrel, the ratio of the flow area of the water hole to the sum of the flow areas of the jet holes being between 0.25 and 0.35.