CN113374420A - Sleeve pipe - Google Patents
Sleeve pipe Download PDFInfo
- Publication number
- CN113374420A CN113374420A CN202010116342.5A CN202010116342A CN113374420A CN 113374420 A CN113374420 A CN 113374420A CN 202010116342 A CN202010116342 A CN 202010116342A CN 113374420 A CN113374420 A CN 113374420A
- Authority
- CN
- China
- Prior art keywords
- chamfer
- coupling
- well
- casing
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims abstract description 117
- 238000010168 coupling process Methods 0.000 claims abstract description 117
- 238000005859 coupling reaction Methods 0.000 claims abstract description 117
- 230000002265 prevention Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 16
- 239000012530 fluid Substances 0.000 abstract description 14
- 230000000149 penetrating effect Effects 0.000 abstract description 14
- 239000004568 cement Substances 0.000 description 13
- 238000010008 shearing Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a casing, which comprises a casing body and a coupling connected with the casing body, wherein a first through hole penetrating through two opposite ends of the casing body is formed in the casing body, a second through hole penetrating through two opposite ends of the coupling is formed in the coupling, the first through hole is communicated with the second through hole, an external thread is arranged at one end, facing a well bottom, of the casing body, an internal thread matched with the external thread is arranged in the second through hole, a first turbulence preventing part is arranged at the outer edge of the section of one end, facing a well mouth, of the coupling, and a second turbulence preventing part is arranged at the outer edge of the end face of one end, facing the well bottom, of the coupling. The casing pipe provided by the invention can obviously reduce the turbulent flow and vortex formed at the right-angled end surface after fluid flows through the coupling in the well cementation displacement process, thereby increasing the axial shear rate and the wall surface shear stress of the flow field area behind the end surface, improving the well cementation displacement efficiency, better removing the virtual mud cake on the well wall and improving the interface cementation quality.
Description
Technical Field
The invention relates to the technical field of oil and gas field well cementation, in particular to a casing.
Background
In the process of oil exploitation, in order to reinforce the well wall, seal oil, gas and water layers in the drilling process and ensure layered oil testing during exploration and reasonable oil and gas production in the whole exploitation, a casing is usually put into the well, and cement is injected into the annular space between the well and the casing so as to achieve the purpose of well cementation.
As shown in fig. 1, the conventional casing includes a casing portion 2 and a collar portion 1 connected to the casing portion, and both end surfaces of the collar portion 1 are at right angles.
However, since the outer edges of the outer end surfaces of the two ends of the collar portion 1 are both right-angled, as shown in fig. 2, turbulence and vortex can be formed in the flow field area behind the collar portion 1 in the process of well cementation displacement, distribution of shear rate and shear stress in the annular flow field formed by the vicinity of the joint of the collar portion 1 and the casing portion 2 and the well side wall 3 can have great influence, which is not favorable for displacement of drilling fluid and removal of the wall of a well loose mud cake, and is difficult to ensure the quality of well cementation.
Disclosure of Invention
The invention provides a casing which can improve the displacement efficiency in the well cementation displacement process and improve the shearing stress of a wall surface so as to clear virtual mud cakes on a well wall and further better ensure the cementing quality of a well cementation interface.
In order to achieve the above object, in a first aspect, the present invention provides a casing for cementing a target zone of an oil and gas well, including a casing body and a coupling connected to the casing body, wherein the casing body has a first through hole penetrating through opposite ends of the casing body, the coupling has a second through hole penetrating through opposite ends of the coupling, the first through hole is communicated with the second through hole, one end of the casing body facing a well bottom has an external thread, the second through hole has an internal thread matching with the external thread, a first turbulence preventing portion is disposed at an outer edge of an end face of one end of the coupling facing the well top, and a second turbulence preventing portion is disposed at an outer edge of an end face of one end of the coupling facing the well bottom.
As an optional mode, in the bushing provided by the invention, the first turbulence preventing portion is a first chamfer, and the second turbulence preventing portion is a second chamfer.
As an optional mode, in the casing provided by the invention, one end of the first chamfer is connected to the intersection line of the internal thread and the end face of the coupling, and the other end of the first chamfer is connected to the outer contour face of the coupling; one end of the second chamfer is connected to the intersection line of the end face of the coupling and the outer contour face of the sleeve body, and the other end of the second chamfer is connected to the outer contour face of the coupling.
As an optional mode, in the sleeve provided by the present invention, the first chamfer is an oblique angle, and the second chamfer is an oblique angle or a curved surface chamfer.
As an optional mode, in the bushing provided by the present invention, if the second chamfer is an oblique angle, the angle of the second chamfer is greater than the angle of the first chamfer.
As an optional mode, the included angle between the inclined plane of the bevel angle and the outer contour surface of the coupling body is 1-60 degrees.
As an optional mode, in the sleeve provided by the present invention, the first chamfer is a curved chamfer, and the second chamfer is an oblique angle or a curved chamfer.
As an optional mode, the curved chamfers of the sleeve provided by the invention have the same curvature radius.
As an optional mode, in the sleeve provided by the present invention, the curved chamfer has a plurality of curvature radii, and each curvature radius is different.
As an alternative mode, the sleeve body and the coupling are integrally formed.
The casing provided by the invention is used for target layer cementing of an oil-gas well and comprises a casing body and a coupling connected with the casing body, wherein a first through hole penetrating through two opposite ends of the casing body is formed in the casing body, a second through hole penetrating through two opposite ends of the coupling is formed in the coupling, the first through hole is communicated with the second through hole, an external thread is arranged at one end, facing the bottom of the well, of the casing body, an internal thread matched with the external thread is formed in the second through hole, a first turbulence preventing part is arranged at the outer edge of the section of one end, facing the well mouth, of the coupling, and a second turbulence preventing part is arranged at the outer edge of the end face of one end, facing the bottom of the well, of the coupling. The first turbulence preventing part and the second turbulence preventing part are respectively arranged at the two ends of the coupling, so that turbulence and vortex formed by cement slurry at the right angle between the coupling and the casing body in the well cementation displacement process can be reduced, the shearing rate of the smooth area of the connection between the two ends of the coupling and each casing body and the shearing stress of the well wall can be increased, the well cementation displacement efficiency can be improved, the virtual mud cake on the well wall can be better cleared, and the cementing quality of a well cementation interface is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a prior art bushing;
FIG. 2 is a schematic representation of the streamlines of a local flow field of a prior art casing;
FIG. 3 is a first structural diagram of a bushing according to an embodiment of the present invention;
FIG. 4 is a second structural diagram of a bushing according to an embodiment of the present invention;
FIG. 5 is a schematic view of a third structure of the bushing according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of a fourth structure of the bushing according to the embodiment of the present invention;
fig. 7 is a schematic flow direction diagram of a local flow field of a casing in a cementing displacement process according to an embodiment of the present invention.
Reference numerals
1-a collar portion;
2-a sleeve part;
3-well sidewalls;
10-a cannula body;
101-a first via;
20-a coupling;
201-a second via;
202-a first turbulence preventing portion;
203-a second spoiler portion;
30-the borehole wall.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "inner sidewall", "outer sidewall", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and the like are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "above" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween.
In the embodiment of the invention, the deep well cementing is taken as an example, wherein in the oil exploitation process, in order to reinforce the well wall, seal oil, gas and water layers in the drilling process and ensure the layered oil testing during exploration and the reasonable oil and gas production in the whole exploitation process, a casing is usually put into the well, and cement is injected into the annular space between the well hole and the casing so as to achieve the purpose of cementing. The existing casing comprises a casing body and a coupling connected with the casing body, wherein first through holes are formed in two opposite ends of the casing body, second through holes are formed in two opposite ends of the coupling, the first through holes and the second through holes are communicated, both end faces of the coupling body are right-angled, an external thread is arranged at one end, close to the bottom, of the casing body, an internal thread matched with the external thread is arranged in the second through holes, the internal thread on the coupling is connected with the external thread on the casing body in the next casing, and therefore the two casing bodies are connected together through the coupling. However, because the outer end faces of the two ends of the coupling are both right-angled, turbulence and vortex can be formed in a flow field area behind the coupling in the well cementation displacement process, so that distribution of shear rate and shear stress in an annular flow field formed by the part near the joint of the coupling and the sleeve body and the well wall can be greatly influenced, displacement of drilling fluid and removal of a virtual mud cake on the well wall are not facilitated, and the well cementation quality is difficult to ensure.
In order to solve the technical problem, the invention provides a casing which is used for target layer well cementation of an oil-gas well and comprises a casing body and a coupling connected with the casing body, wherein a first through hole penetrating through two opposite ends of the casing body is formed in the casing body, a second through hole penetrating through two opposite ends of the coupling is formed in the coupling, the first through hole is communicated with the second through hole, an external thread is arranged at one end, facing the well bottom, of the casing body, an internal thread matched with the external thread is formed in the second through hole, a first turbulence preventing part is arranged at the outer edge of the section of one end, facing the well top, of the coupling, and a second turbulence preventing part is arranged at the outer edge of the end face of one end. The first turbulence preventing part and the second turbulence preventing part are respectively arranged at the two ends of the coupling, so that turbulence and vortex formed by cement slurry at the right angle between the coupling and the casing body in the well cementation displacement process can be reduced, the shearing rate of the smooth area of the connection between the two ends of the coupling and each casing body and the shearing stress of the well wall can be increased, the well cementation displacement efficiency can be improved, the virtual mud cake on the well wall can be better cleared, and the cementing quality of a well cementation interface is ensured.
FIG. 3 is a first structural diagram of a bushing according to an embodiment of the present invention; FIG. 4 is a second structural diagram of a bushing according to an embodiment of the present invention; FIG. 5 is a schematic view of a third structure of the bushing according to the embodiment of the present invention; FIG. 6 is a schematic diagram of a fourth structure of the bushing according to the embodiment of the present invention; fig. 7 is a schematic flow direction diagram of a local flow field of a casing in a cementing displacement process according to an embodiment of the present invention.
As shown in fig. 3 to 7, the present invention provides a casing for cementing a target zone of an oil or gas well, comprising: casing body 10 and coupling 20 of being connected with casing body 10, the first through-hole 101 that has the relative both ends of lining up casing body 10 in the casing body 10, the second through-hole 201 that has the relative both ends of lining up coupling 20 in the coupling 20, first through-hole 101 and second through-hole 201 intercommunication, casing body 10 has the external screw thread towards the one end in shaft bottom, have in the second through-hole 201 with external screw thread assorted internal thread, coupling 20 is equipped with first vortex portion 202 of preventing towards the terminal surface outer fringe department of the one end of well head, coupling 20 is equipped with second vortex portion 203 of preventing towards the terminal surface outer fringe department of the one end in shaft bottom.
Specifically, in the oil exploitation process, in order to protect and support a casing in an oil and gas well and to seal and separate oil, gas, and water and other strata, a well cementing operation is usually required, the well cementing operation is a construction operation of lowering the casing into the well and injecting cement into an annular space between the well and the casing, because the oil and the gas wells are relatively deep and the well is relatively large in size, the casing provided by the embodiment includes a casing body 10 and a coupling 20 connected with the casing body 10, and the casing bodies 10 with fixed lengths are connected together by the coupling 20, wherein the casing body 10 and the coupling 20 may be integrally formed by casting or the like or may be separately processed and connected together by a threaded connection, a clamping connection or the like, and the embodiment is not limited.
The coupling 20 may be made of steel, alloy, or other materials having a certain strength, for example, 45 steel, 10 steel, 20 steel, or other metal materials having a good strength, and the casing body 10 may be made of a metal material having a certain strength, such as steel.
Further, in order to allow a cementing fluid such as a cement paddle, a flushing fluid, and the like to smoothly pass through, a first through hole 101 penetrating through opposite ends of the casing body 10 is provided in the casing body 10, a second through hole 201 penetrating through opposite ends of the collar 20 is provided in the collar 20, and the first through hole 101 and the second through hole 201 communicate with each other, wherein the cross-sectional shapes of the first through hole 101 and the second through hole 201 may be any structural shape such as a circle, a polygon, and the like.
In the well cementation operation, an annular flow channel between a casing and a well wall 30 is a complex eccentric flow field, the displacement efficiency and the wall shear stress are influenced by a plurality of factors such as well bore conditions, the centering degree, the performance of cement slurry, the return speed and the like, the joint of a traditional casing body 10 and a coupling 20 is a right-angle turn, so that a suddenly enlarged and suddenly reduced reducing area is formed in the eccentric annular flow field, the shear rate and the shear stress of fluids such as cement paddles at each point in the flow field are greatly disturbed to form turbulent flow and vortex phenomena, so that a displacement interface is unstable, the axial shear rate of the fluids is obviously reduced, the well cementation displacement efficiency is reduced, the axial shear rate of the fluids is reduced, the axial shear stress of the well wall 30 is correspondingly reduced, and the effect of removing the virtual mud cakes on the well wall 30 through the axial shear stress of the well wall is poor, therefore, the well cementation quality is difficult to guarantee, the well cementation quality is very important for improving the well integrity of the life cycle of an oil-gas well, a most critical ring in all well cementation operations is well-cemented in a target layer, even the success or failure of the production of test oil can be directly influenced, therefore, the improvement of the well cementation quality of the target layer is very important, particularly, the well with active formation oil, gas and water and high requirements for interval of layers is well-sealed, the casing provided by the embodiment is suitable for a tail pipe section of the target layer, the first turbulence preventing part 202 is arranged at the outer edge of the end face of one end, facing the well mouth, of the coupling 20, and the second turbulence preventing part 203 is arranged at the outer edge of the end face of one end, facing the well bottom, of the coupling 20. Through setting up first turbulence preventing portion 202 and second turbulence preventing portion 203 help cleaing away coupling 20 near because of with the wall of a well 30 between the narrow and small remaining mud of annular space and the virtual mud cake on the wall of a well 30, improved the filling rate and the glued quality of interface of the cement thick liquid in key interval to realize better well barrier effect.
Wherein, the both ends of coupling 20 can be the taper structure that the diameter is less than coupling 20 interlude diameter in order to form first vortex prevention portion 202 and second vortex prevention portion 203, perhaps the structure of first vortex prevention portion 202 and second vortex prevention portion 203 also can be chamfer or other structures, first vortex prevention portion 202 and second vortex prevention portion 203 as long as can improve vortex and vortex phenomenon that coupling 20 and sleeve pipe body 10 junction produced, can increase the shearing rate of the smooth region of coupling 20 both ends and each sleeve pipe body 10 junction and the shearing stress of the wall of a well 30, can improve well cementation displacement efficiency, and can be better clear away the virtual mud cake on the wall of a well 30, guarantee well cementation interface's cementation quality can.
Optionally, the second turbulence preventing portion 203 may also be a tapered elastic ring structure, a small end of the tapered ring has a size consistent with the size of the outer contour of the casing body 10, and a large end of the tapered ring has a size consistent with the size of the outer contour of the coupling 20, and the tapered elastic ring is sleeved at the joint of the coupling 20 and the casing body 10, so that the small end of the tapered elastic ring is connected to the casing body 10, and the large end of the tapered elastic ring is connected to the outer edge of the end face of the coupling 20 near one end of the casing body 10; therefore, the transition of the conical elastic ring can improve the turbulent flow and vortex phenomena of the fluid, thereby improving the shear stress of the well wall 30, improving the replacement efficiency of well cementation, better removing the virtual mud cake on the well wall 30 and improving the cementing quality of the second interface. The turbulence preventing portion may also be of other structures, as long as the turbulence and vortex phenomena of the fluid can be improved, and the shear stress of the well wall 30 is increased, which is not limited in this embodiment.
The casing provided by the embodiment of the invention is used for target layer cementing of an oil-gas well and comprises a casing body 10 and a coupling 20 connected with the casing body 10, wherein a first through hole 101 penetrating through two opposite ends of the casing body 10 is formed in the casing body 10, a second through hole 201 penetrating through two opposite ends of the coupling 20 is formed in the coupling 20, the first through hole 101 is communicated with the second through hole 201, an external thread is arranged at one end, facing the well bottom, of the casing body 10, an internal thread matched with the external thread is formed in the second through hole 201, a first turbulence preventing part 202 is arranged at the outer edge of the section of one end, facing the well top, of the coupling 20, and a second turbulence preventing part 203 is arranged at the outer edge of the end face of one end, facing the well bottom, of the coupling 20. Through set up first vortex portion 202 and second vortex portion 203 respectively at the both ends of coupling 20, can reduce vortex and swirl that the right angle department of cement slurry between coupling 20 and sleeve pipe body 10 formed in the well cementation displacement process, can increase the shearing rate in the smooth region of coupling 20 both ends and each sleeve pipe body 10 junction and the shear stress of the wall of a well 30, thereby can improve well cementation displacement efficiency, and can be better clear away the virtual mud cake on the wall of a well 30, guarantee the cementation quality at well cementation interface.
On the basis of the above embodiment, optionally, the first turbulence preventing portion 202 is a first chamfer, and the second turbulence preventing portion 203 is a second chamfer.
Concretely, for the vortex and the swirl phenomenon of fluid such as improvement cement oar at the junction formation of coupling 20 and sleeve pipe body 10, guarantee that coupling 20's intensity satisfies the operation requirement simultaneously, can set up first chamfer at the terminal surface outer fringe department of coupling 20 towards the one end of well head, in order to form first vortex portion 202 of preventing, set up the second chamfer at the terminal surface outer fringe department of coupling 20 towards the one end in well bottom, in order to form second vortex portion 203 of preventing, thereby improve well cementation replacement efficiency, clear away the virtual mud cake on the wall of a well 30, guarantee the cementation quality at well cementation interface.
Further, one end of the first chamfer is connected to the junction of the end face of the coupling 20 and the internal thread, and the other end of the first chamfer is connected to the outer contour face of the coupling 20; one end of the second chamfer is connected to the intersection line of the end face of the collar 20 and the outer contour face of the casing body 10, and the other end of the second chamfer is connected to the outer contour face of the collar 20.
Specifically, one end of the first chamfer is connected to the junction between the end face of the coupling 20 and the internal thread, that is, the position of the end of the first chamfer is unchanged, and the other end of the first chamfer is connected to the outer contour face of the coupling 20, so that the size of the first chamfer can be adjusted by adjusting the position of the other end of the first chamfer on the outer contour face of the coupling 20, so that the size of the first chamfer can improve the turbulence and vortex phenomena of the fluid, and the strength requirement of the coupling 20 is also met. Correspondingly, the one end of second chamfer is connected to the handing-over department of the terminal surface of coupling 20 and the outer profile face of sleeve body 10, that is to say, this one end position of second chamfer is fixed unchangeable, and the other end of second chamfer is connected to on the outer profile face of coupling 20, through adjusting the position of this one end on the outer profile face of coupling 20, can adjust the size of second chamfer to make the size of second chamfer can improve the vortex and the swirl phenomenon of fluid promptly, still satisfy coupling 20's strength requirement simultaneously.
In one embodiment, the first chamfer is an oblique angle and the second chamfer is an oblique or curved chamfer.
Specifically, in order to improve the replacement efficiency of the cementing well and better remove the broken mud cake on the well wall 30, the outer edges of the end faces of the couplings 20 near the wellhead (i.e. the upper end faces of the couplings 20) may be beveled, the beveled angles on the couplings 20 in the circumferential direction may be equal in size or may be beveled, for example, in the case that the strength of the couplings 20 is sufficient, the distance between the sidewall of one direction of the couplings 20 and the well wall 30 is too small, so that the beveled angle at this position can be larger than the beveled angles at other positions, and the structure of the couplings 20 with the beveled angle can be formed. And the outer edge of the end face of one end of the coupling 20 close to the well bottom is provided with a chamfer angle or a curved surface chamfer, wherein the angle of the chamfer angle along the circumferential direction is equal or unequal, namely the chamfer angle is a variable angle, or the second chamfer angle can also be a curved surface chamfer, namely the second chamfer angle is a curved surface chamfer formed by an arc or a spline curve and the like.
The bevel is the included angle between the chamfer and the outer contour surface of the coupling 20, and the smaller the included angle is, the longer the length of the bevel is, the better the effect of improving the turbulence and vortex of the fluid is, but the lower the strength of the coupling 20 is.
On the basis of the above embodiment, if the second chamfer is an oblique angle, the angle of the second chamfer is greater than that of the first chamfer.
Specifically, first chamfer is towards well head department, and the second chamfer is towards well bottom department, therefore, the dead weight of coupling 20 itself will be born at the second chamfer, and in order to guarantee coupling 20 intensity requirement, the angle of second chamfer can be greater than the angle of first chamfer.
Optionally, the included angle between the bevel of the bevel and the outer contour surface of the coupling 20 is 1 to 60 °.
Specifically, the angle of the bevel angle may be any included angle between 1 ° and 60 °, wherein when the included angle is between 1 ° and 45 °, the effect of improving the filling rate of cement and removing the virtual mud cake is better, and considering feasibility of the processing technology and processing measurement, the angle of the bevel angle may be set to be 15 °, 30 ° or 45 °, which is not limited in this embodiment.
In another embodiment, the first chamfer is a curved chamfer and the second chamfer is an angled or curved chamfer.
Specifically, in order to reduce the failure of the collar 20 due to stress concentration locally at the chamfer, the first chamfer may be a smooth curved chamfer. The curved surface chamfer can be a fillet or a curved surface chamfer formed by a smooth spline curve, and the like, and the second chamfer can be an oblique angle or a curved surface chamfer, so that the embodiment is not limited.
In an alternative implementation, the radii of curvature of the curved chamfers are equal.
Specifically, for convenience of processing, the curved surface chamfer may be a fillet with the same curvature radius, wherein the curved surface chamfer may be formed by integrally forming the coupling 20 by casting or the like, or may be formed by cutting.
In another alternative implementation, the curved chamfer has a plurality of radii of curvature, and each radius of curvature is different.
Specifically, the first chamfer may also be a curved chamfer with unequal radius of curvature, so that local stress concentration can be better avoided, and the curved chamfer with unequal radius may be cut on a machine tool such as a machining center, or may be integrally formed with the coupling 20, which is not limited in this embodiment.
Alternatively, the sleeve body 10 and the collar 20 are integrally formed.
Specifically, in order to simplify the manufacturing process and save the cost, the sleeve body 10 and the coupling 20 may be manufactured by integral molding such as casting.
In some embodiments, the internal threads may alternatively be tapered internal threads, wherein the internal threads of the end of the body of collar 20 have an internal diameter greater than the internal diameter of the internal threads of the interior of the body of collar 20.
Specifically, in order to improve the sealing performance between the coupling 20 and the casing body 10 of the next casing, the internal diameter of the internal thread at the end of the coupling 20 body is larger than the internal diameter of the internal thread inside the coupling 20 body, and correspondingly, the end of the casing body 10 matched with the conical internal thread is a conical external thread and is connected in a screwing manner of the internal thread and the external thread, so that the sealing performance between the coupling 20 and the casing body 10 can be improved.
The casing provided by the invention is used for target layer cementing of an oil-gas well and comprises a casing body and a coupling connected with the casing body, wherein a first through hole penetrating through two opposite ends of the casing body is formed in the casing body, a second through hole penetrating through two opposite ends of the coupling is formed in the coupling, the first through hole is communicated with the second through hole, an external thread is arranged at one end, facing the bottom of the well, of the casing body, an internal thread matched with the external thread is formed in the second through hole, a first turbulence preventing part is arranged at the outer edge of the section of one end, facing the well mouth, of the coupling, and a second turbulence preventing part is arranged at the outer edge of the end face of one end, facing the bottom of the well, of the coupling. The first turbulence preventing part and the second turbulence preventing part are respectively arranged at the two ends of the coupling, so that turbulence and vortex formed by cement slurry at the right angle between the coupling and the casing body in the well cementation displacement process can be reduced, the shearing rate of the smooth area of the connection between the two ends of the coupling and each casing body and the shearing stress of the well wall can be increased, the well cementation displacement efficiency can be improved, the virtual mud cake on the well wall can be better cleared, and the cementing quality of a well cementation interface is ensured.
In the description herein, references to the description of "one embodiment," "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions fall off the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A casing for cementing a target zone of an oil or gas well, comprising: the sleeve pipe body and with this body coupling of sleeve pipe, this internal link up of having of sleeve pipe have the first through-hole at the relative both ends of sleeve pipe body, have in the coupling and link up the second through-hole at the relative both ends of coupling, first through-hole with second through-hole intercommunication, the sleeve pipe body has the external screw thread towards the one end in the shaft bottom, have in the second through-hole with external screw thread assorted internal thread, the coupling is equipped with first vortex portion of preventing towards the terminal surface outer fringe department of the one end of well head, the coupling is equipped with the vortex portion of preventing of second towards the terminal surface outer fringe department of the one end in the shaft bottom.
2. The bushing of claim 1, wherein the first turbulation prevention portion is a first chamfer and the second turbulation prevention portion is a second chamfer.
3. The casing of claim 2, wherein one end of the first chamfer is connected to an intersection of the end face of the collar and the internal thread and the other end of the first chamfer is connected to an outer profile face of the collar; one end of the second chamfer is connected to the joint of the end face of the coupling and the outer contour face of the sleeve body, and the other end of the second chamfer is connected to the outer contour face of the coupling.
4. The cannula according to claim 3, wherein the first chamfer is a bevel and the second chamfer is a bevel or a curved chamfer.
5. The bushing of claim 4 wherein if the second chamfer is a bevel, the angle of the second chamfer is greater than the angle of the first chamfer.
6. A casing according to claim 5, wherein the angle between the inclined surface of the bevel and the outer profile surface of the collar is in the range 1 ° to 60 °.
7. The cannula according to claim 3, wherein the first chamfer is a curved chamfer and the second chamfer is an angled or curved chamfer.
8. The cannula according to claim 7, wherein the curved chamfers have equal radii of curvature.
9. The cannula according to claim 7, wherein the curved chamfer has a plurality of radii of curvature, and each of the radii of curvature is different.
10. A casing as claimed in claim 1, wherein the casing body and the collar are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010116342.5A CN113374420A (en) | 2020-02-25 | 2020-02-25 | Sleeve pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010116342.5A CN113374420A (en) | 2020-02-25 | 2020-02-25 | Sleeve pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113374420A true CN113374420A (en) | 2021-09-10 |
Family
ID=77569238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010116342.5A Pending CN113374420A (en) | 2020-02-25 | 2020-02-25 | Sleeve pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113374420A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622386Y (en) * | 2003-05-23 | 2004-06-30 | 辽河石油勘探局工程技术研究院 | Fluidmaster for well cementing |
| CN102108838A (en) * | 2009-12-25 | 2011-06-29 | 天津天钢石油专用管制造有限公司 | Gap collar for lateral drilling |
| CN103352673A (en) * | 2013-07-30 | 2013-10-16 | 中国海洋石油总公司 | Monocular twin-well surface layer well cementation technology |
| CN203515464U (en) * | 2013-09-16 | 2014-04-02 | 中国石油天然气股份有限公司 | Well cementation device |
| CN203978312U (en) * | 2014-07-07 | 2014-12-03 | 中国海洋石油总公司 | Heat insulation box cupling |
| CN107956431A (en) * | 2016-10-18 | 2018-04-24 | 陈晓新 | A kind of oil casing collar |
| US20180266189A1 (en) * | 2017-03-20 | 2018-09-20 | Gb Connections Llc | Reduced drag casing connection |
| US20180266208A1 (en) * | 2017-03-16 | 2018-09-20 | Saudi Arabian Oil Company | Systems and methods for stage cementing |
-
2020
- 2020-02-25 CN CN202010116342.5A patent/CN113374420A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622386Y (en) * | 2003-05-23 | 2004-06-30 | 辽河石油勘探局工程技术研究院 | Fluidmaster for well cementing |
| CN102108838A (en) * | 2009-12-25 | 2011-06-29 | 天津天钢石油专用管制造有限公司 | Gap collar for lateral drilling |
| CN103352673A (en) * | 2013-07-30 | 2013-10-16 | 中国海洋石油总公司 | Monocular twin-well surface layer well cementation technology |
| CN203515464U (en) * | 2013-09-16 | 2014-04-02 | 中国石油天然气股份有限公司 | Well cementation device |
| CN203978312U (en) * | 2014-07-07 | 2014-12-03 | 中国海洋石油总公司 | Heat insulation box cupling |
| CN107956431A (en) * | 2016-10-18 | 2018-04-24 | 陈晓新 | A kind of oil casing collar |
| US20180266208A1 (en) * | 2017-03-16 | 2018-09-20 | Saudi Arabian Oil Company | Systems and methods for stage cementing |
| US20180266189A1 (en) * | 2017-03-20 | 2018-09-20 | Gb Connections Llc | Reduced drag casing connection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6030004A (en) | High torque threaded tool joint for drill pipe and other drill stem components | |
| CN101946056B (en) | Drill packer member, drill pipe, and corresponding drill pipe string | |
| US7325633B2 (en) | Rock drill bit and a thread joint therefor | |
| CN107208463B (en) | Balanced thread form, pipe employing balanced thread forms, and related methods | |
| CN108625788B (en) | Novel pdc and cone combined drill bit | |
| CN208456509U (en) | A kind of novel PDC, gear wheel composite drill bit | |
| EP3536893B1 (en) | Connection for percussion drilling | |
| USRE37006E1 (en) | High flow weld-in nozzle sleeve for rock bits | |
| CN113374420A (en) | Sleeve pipe | |
| CN205532291U (en) | Reamer | |
| CN103362450B (en) | Non-coupling multi-sealing tooth-width-variable wedge type threaded oil well pipe structure | |
| CN211287550U (en) | Drill rod connecting mechanism suitable for gas extraction of soft coal seam | |
| CN211173974U (en) | Gas extraction drill rod joint and drilling tool with enhanced slag discharge function | |
| CN113374421A (en) | Sleeve pipe | |
| CN113374423A (en) | Coupling and casing with coupling | |
| WO2022217965A1 (en) | Convenient to disasemble and assemble rotating member having stable self-locking function, cutter, and composite cutter | |
| CN203796182U (en) | Triangular-ribbed drill pipe for coal mine gallery drilling and drilling mud removal | |
| CN108222845B (en) | Annular cutting alloy tooth for drilling and production tool | |
| CN210888894U (en) | High-energy-gathering erosion-resistant and splash-resistant hydraulic sand blasting perforation fracturing device | |
| CN103930640A (en) | Drill bit for rock drilling tool, and rock drilling tool | |
| CN220705650U (en) | Long-life drill rod capable of reducing drilling cost | |
| CN106050165A (en) | Rigid centralizer | |
| CN218953259U (en) | High-pressure sealing three-edge grooving drill rod | |
| CN111005685B (en) | Gear wheel-PDC composite sleeve milling bit | |
| CN103362451B (en) | Non-coupling good-sealing bending-resistant tooth-width-variable wedge type threaded oil well pipe structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210910 |