CN214576810U - Well cementation nipple joint and fixing device - Google Patents

Abstract

The utility model provides a well cementation nipple joint and fixing device, this well cementation nipple joint includes: drill pipe connectors and casing connectors; the two ends of the drill rod connecting piece are used for being connected with a drill rod in a sealing mode, a first flow passage for allowing fluid to pass through is formed inside the drill rod connecting piece, the first flow passage is provided with an inlet and an outlet, and the first flow passage is communicated with the drill rod through the inlet and the outlet; the casing pipe connecting piece is sleeved on the drill rod connecting piece, the casing pipe connecting piece is in sealing fit with the drill rod connecting piece, and the casing pipe connecting piece is used for being in sealing fit with the casing pipe. Adopt the utility model provides a well cementation nipple joint has avoided the grout to pour back the emergence of phenomenon, has improved the well cementation operating efficiency.

Description

Well cementation nipple joint and fixing device

Technical Field

The utility model relates to a well cementation technical field especially relates to a well cementation nipple joint and fixing device.

Background

The well cementation is an important operation in the well drilling process, and the well cementation is a construction process of injecting cement slurry into an annular space between a well hole and a casing after the casing is put into the well. The well cementation process can reinforce the well wall, is convenient for supporting the casing and the wellhead device and is convenient for normal use of the oil-gas channel.

In the prior art, an insertion method is generally adopted for well cementation, before well cementation, a casing is firstly put into a borehole and fixed, an annular space is formed between the casing and the borehole, and a sealing socket is fixed at the tail end of the casing facing the bottom of the borehole; after the casing is fixed in a well hole, a drill rod with a plug connector fixed at the tail end is firstly put into the casing, then the plug connector is inserted into a sealing socket at the bottom of the casing, cement slurry is injected into the drill rod, and the cement slurry flows into a guide shoe at the lower end of the sealing socket through the plug connector of the drill rod and then flows into an annular space between the well hole and the casing, so that well cementation is realized.

Although the prior art can realize well cementation, however, because the grafting setting between bayonet joint and the sealed socket, when grout flows in the guide shoe of sealed socket lower extreme through the bayonet joint, the flow of grout in the drilling rod can make the drilling rod drive the bayonet joint and radially sway along the sheathed tube, make the bayonet joint have certain degree to sealed socket impact, very easily cause sealed socket to damage, lead to sealed not tight between the two, make during the cementing grout flows out the annular space between entering drilling rod and the sleeve pipe by the bayonet joint of drilling rod, cause the grout to return from the annular space between drilling rod and the sleeve pipe, influence the normal clear of well cementation process.

SUMMERY OF THE UTILITY MODEL

The application provides a well cementation nipple joint and fixing device to solve among the prior art because of sealed not tight between bayonet joint and the sealed socket and lead to the problem that grout returns.

On the one hand, this application provides a well cementation nipple joint, includes: drill pipe connectors and casing connectors; the two ends of the drill rod connecting piece are used for being connected with a drill rod in a sealing mode, a first flow passage for allowing fluid to pass through is formed inside the drill rod connecting piece, the first flow passage is provided with an inlet and an outlet, and the first flow passage is communicated with the drill rod through the inlet and the outlet; the casing pipe connecting piece is sleeved on the drill rod connecting piece, the casing pipe connecting piece is in sealing fit with the drill rod connecting piece, and the casing pipe connecting piece is used for being in sealing fit with the casing pipe.

Further, a first end of the casing connection piece facing the inlet is provided with internal threads for threaded connection with the drill rod connection piece; the second end of the sleeve connecting piece facing the outlet is provided with external threads so as to be in threaded connection with the sleeve; wherein the outer diameter of the second end is larger than or equal to the outer diameter of the first end, and the thread direction of the internal thread of the first end is opposite to that of the external thread of the second end, so that the drill rod connecting piece can generate displacement along the axial direction of the casing relative to the casing connecting piece.

Further, at least one sealing element is arranged between the drill rod connecting piece and the casing connecting piece so as to enable the casing connecting piece to be in sealing fit with the drill rod connecting piece.

Further, the inlet end of the drill rod connecting piece facing the inlet is provided with at least one sealing element so as to enable the drill rod connecting piece to be connected with the drill rod in a sealing mode; the outlet end of the drill rod connecting piece facing the outlet is provided with at least one sealing piece so as to enable the drill rod connecting piece to be connected with the drill rod in a sealing mode.

Further, an inlet end of the drill rod connector facing the inlet and/or an outlet end of the drill rod connector facing the outlet is threadedly connected with the corresponding drill rod.

Furthermore, an elevator pipe section is further arranged on the drill rod connecting piece, the elevator pipe section is located between the inlet end of the drill rod connecting piece and the casing pipe connecting piece, and the outer diameter of the elevator pipe section is smaller than that of the inlet end.

Further, the drill rod connector comprises a protective sleeve, wherein the protective sleeve is sleeved on the drill rod connector and is located between the casing pipe connector and the outlet end of the drill rod connector.

Further, the protective sleeve is in threaded connection with the drill rod connector.

Furthermore, it has the wedge groove to open on the protective sheath, be equipped with the rectangular channel on the drilling rod connecting piece, the rectangular channel orientation the upper end of entry is higher than the upper end of wedge groove, just the part of rectangular channel with wedge groove intercommunication, the rectangular channel with be provided with the drive key in the wedge groove, so that the protective sheath with the drilling rod connecting piece synchronous rotation.

In another aspect, the present application provides a fixation device comprising: at least two drill pipes, wherein the cementing short joint is connected between at least two adjacent drill pipes.

The utility model provides a pair of well cementation nipple joint and fixing device, this well cementation nipple joint is through setting up the drilling rod connecting piece with drilling rod sealing connection, through the inside first runner that supplies the fluid to pass through that forms of drilling rod connecting piece, through being linked together first runner and drilling rod, locate the bushing piece on the drilling rod connecting piece through setting up the cover, through setting up bushing piece into respectively with drilling rod connecting piece sleeve pipe sealing connection, make to form sealed space between well cementation nipple joint and the sleeve pipe, in order to avoid the well cementation time grout to take place to fall back the phenomenon, guarantee the normal clear of well cementation. Adopt the utility model provides a well cementation nipple joint has avoided the grout to pour back the emergence of phenomenon, and then has improved the well cementation operating efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural diagram of a well cementation short section provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a well cementation short section provided in an embodiment of the present invention;

fig. 3 is a schematic structural view of a drill pipe connector according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a sleeve connector according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 6 is a schematic structural view of a protective sheath according to an embodiment of the present invention.

Reference numerals:

1-cementing short section;

100-drill pipe connections; 110-sitting elevator pipe section; 120-rectangular groove;

200-a casing connection; 210-a first end; 220-a second end;

300-a drill pipe;

400-a cannula;

500-protective sheath; 510-a drive key; 511-rectangular section; 512-wedge.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

Fig. 1 is a schematic structural diagram of a well cementation short section provided in an embodiment of the present invention; fig. 2 is a schematic structural diagram of a well cementation short section provided in an embodiment of the present invention; fig. 3 is a schematic structural view of a drill pipe connector according to an embodiment of the present invention; fig. 4 is a schematic structural view of a sleeve connector according to an embodiment of the present invention; a cementing sub according to an embodiment of the first aspect of the present application is described below with reference to fig. 1-4. As shown in fig. 1-4, the present application provides a well cementation nipple 1, including: drill pipe coupling 100 and casing coupling 200; the two ends of the drill rod connecting piece 100 are used for being connected with the drill rod 300 in a sealing mode, a first flow channel for allowing fluid to pass through is formed inside the drill rod connecting piece 100, the first flow channel is provided with an inlet and an outlet, and the first flow channel is communicated with the drill rod 300 through the inlet and the outlet; casing connector 200 is sleeved on drill pipe connector 100, casing connector 200 is in sealing fit with drill pipe connector 100, and casing connector 200 is used for sealing fit with casing 400.

In particular, drill pipe coupling 100 may be tubular, such as a constant cross-section pipe; it may also be tubular with a varying cross-section, e.g. a gradually increasing cross-section. Optionally, the material of the drill rod connector 100 may be a metal material, or may also be a plastic material with a certain hardness, which is not specifically limited herein; of course, drill rod coupling 100 may be made of the same material as drill rod 300, i.e., when drill rod 300 is made of metal, drill rod coupling 100 may also be made of metal, so as to facilitate the engagement of drill rod coupling 100 and drill rod 300.

The interior of the drill rod coupling 100 defines a first flow passage for passage of fluid, the first flow passage having an inlet and an outlet, it being understood that the first flow passage extends through the drill rod coupling 100, the inlet of the first flow passage being located at the inlet end of the drill rod coupling 100 and the outlet of the first flow passage being located at the outlet end of the drill rod coupling 100.

Both ends of the drill rod connector 100 are hermetically connected with the drill rods 300, and it can be understood that the inlet end of the drill rod connector 100 is connected with one drill rod 300, that is, the drill rod 300 is connected with the inlet end of the first flow passage of the drill rod connector 100, and the inlet of the drill rod connector 100 is communicated with the drill rod 300, so as to transmit cement slurry; the outlet end of the drill rod coupling 100 is connected to another drill rod 300, i.e., the drill rod 300 is connected to the outlet end of the first flow passage of the drill rod coupling 100, and the outlet of the drill rod coupling 100 is in communication with another drill rod 300 to facilitate the transfer of grout into the casing 400.

Optionally, two ends of the drill rod connector 100 may be connected to the drill rod 300 through flanges, for example, an inlet end of the drill rod connector 100 is connected to the drill rod 300 through a flange, a first flange piece is fixed at the inlet end of the drill rod connector 100, a second flange piece is fixed at one side of the drill rod 300 facing the inlet end of the drill rod connector 100, first through holes are uniformly distributed on the outer edge of the first flange piece protruding out of the drill rod connector 100, second through holes are uniformly distributed on the outer edge of the second flange piece protruding out of the drill rod 300, and a bolt is connected to a nut after passing through the first through hole and the second through hole, so that the first flange piece is fastened to the second flange piece, and further, the drill rod connector 100 is fastened to the drill rod 300. Optionally, a sealing groove is formed in one side of the first flange piece facing the drill rod 300, and a sealing ring is arranged in the sealing groove, so that the drill rod connector 100 is connected with the drill rod 300 in a sealing manner; of course, a sealing groove may also be provided on the second flange plate to ensure the sealing connection between the first flange plate and the second flange plate, so as to realize the sealing connection between the drill rod connector 100 and the drill rod 300.

The outlet end of the drill rod connector 100 is connected to the drill rod 300 via a flange, and the specific connection method is the same as the above connection method, and is not described herein again.

The casing connection 200 may be tubular, wherein the casing connection 200 may be tubular with a constant outer diameter, or tubular with a gradually changing outer diameter, for example, tubular with a gradually increasing outer diameter. Optionally, the material of the casing connecting element 200 may be a metal material, or may also be a plastic material with a certain hardness, which is not specifically limited herein.

The casing connector 200 is sleeved on the drill rod connector 100, and the casing connector 200 is in sealing fit with the drill rod connector 100, it can be understood that the casing connector 200 is sleeved between the inlet end and the outlet end of the drill rod connector 100, wherein the casing connector 200 can be in sealing fit with the drill rod connector 100 through a sealing ring.

Alternatively, casing connector 200 may be fixedly connected to drill rod connector 100, for example, drill rod connector 100 may be provided with two outwardly protruding limiting portions, which are referred to as a first limiting portion and a second limiting portion, and casing connector 200 is fixed between the first limiting portion and the second limiting portion. Specifically, the first limit portion and the second limit portion may be annular plates provided with internal threads, and the corresponding positions of the drill rod connector 100 may be provided with external threads matched with the internal threads of the annular plates, so that the first limit portion and the second limit portion are fixed on the drill rod connector 100, and the casing connector 200 is hermetically fixed between the first limit portion and the second limit portion.

The casing connector 200 may be in sealing engagement with the casing 400, for example, the outer circumference of the casing connector 200 may be provided with an external thread, the casing may be provided with an internal thread adapted to the external thread of the casing connector 200, and the upper end of the joint of the casing 400 and the casing connector 200 may be provided with a sealing ring, so that the casing connector 200 and the casing 400 are in sealing engagement.

By adopting the well cementation short section provided by the embodiment, before well cementation, the casing connecting piece 200 is sleeved on the drill rod connecting piece 100, and the casing connecting piece 200 is in sealing connection with the drill rod connecting piece 100; when the well cementation operation is to be carried out, firstly, a first drill rod 300 is put into a casing until the drill rod 300 is partially exposed relative to the casing, then, the upper end of the first drill rod 300, which is far away from the well bottom, is hermetically connected with the outlet end of a drill rod connecting piece 100, the first drill rod 300 is continuously put downwards, and when a casing connecting piece 200 on the drill rod connecting piece 100 is contacted with the inner wall of the casing 400, a well cementation short section is rotated, so that the casing connecting piece 200 is hermetically and fixedly connected with the casing 400; and then fixedly connecting a second drill pipe 300 with the upper end of the drill pipe connecting piece 100 to complete the sealing and fixed connection of the well cementation short section 1, the drill pipe 300 and the casing 400.

When well cementation is required, cement slurry is introduced into the second drill pipe 300, the cement slurry sequentially flows into the inlet of the first flow channel of the drill pipe connecting piece 100 through the second drill pipe 300, then flows into the first drill pipe 300 through the outlet of the first flow channel, and the cement slurry is introduced into an annulus between a borehole and a casing through the first drill pipe 300.

The utility model provides a pair of well cementation nipple joint, through setting up drilling rod connecting piece 100 with drilling rod 300 sealing connection, through the inside first runner that supplies the fluid to pass through that forms of drilling rod connecting piece 100, through being linked together first runner and drilling rod 300, locate the casing pipe connecting piece 200 on drilling rod connecting piece 100 through setting up the cover, through set up casing pipe connecting piece 200 to respectively with drilling rod connecting piece 100, casing pipe 400 sealing connection, make and form sealed space between well cementation nipple joint 1 and the casing pipe 400, in order to avoid the grout to take place to return the phenomenon during well cementation, guarantee the normal clear of well cementation. By adopting the well cementation short section provided by the embodiment, the phenomenon that cement slurry flows back is avoided, and the well cementation working efficiency is further improved.

Further, a first end 210 of casing connector 200 facing the inlet is internally threaded to threadably connect with drill rod connector 100; the second end 220 of the casing connector 200 towards the outlet is provided with an external thread to be threadedly connected with the casing 400; wherein the outer diameter of second end 220 is greater than or equal to the outer diameter of first end 210, and the thread direction of the internal thread of first end 210 is opposite to the thread direction of the external thread of second end 220, so that rod connector 100 can be displaced in the casing axial direction relative to casing connector 200.

Specifically, casing joint 200 includes a first end 210 facing the entrance of drill pipe joint 100 and a second end 220 opposite first end 210; alternatively, the outer diameter of first end 210 may be equal to the outer diameter of second end 220, and the outer diameter of second end 220 may be greater than the outer diameter of first end 210.

When the outer diameter of the first end 210 is equal to the outer diameter of the second end 220, the casing connector 200 is tubular with a constant cross section, wherein the inner circumference of the casing connector 200 is provided with internal threads to be fastened with external threads provided on the drill rod connector 100; the outer circumference of the sleeve coupler 200 is provided with external threads to be fastened with internal threads provided on the sleeve 400.

When the outer diameter of the second end 220 is larger than the outer diameter of the first end 210, the casing connector 200 may be tubular with a gradually decreasing cross-section, with a transition section between the first end 210 and the second end 220; wherein the inner circumference of the first end 210 is provided with internal threads to facilitate the threaded connection of the first end 210 of the casing connector 200 with the drill rod connector 100; the outer circumference of the second end 220 is externally threaded to facilitate the threaded connection of the second end 220 of the casing coupler 200 with the casing 400.

Optionally, the thread direction of the internal thread of the first end 210 is opposite to the thread direction of the external thread of the second end 220, and it can be understood that when the thread direction of the internal thread of the first end 210 is left-handed, the thread direction of the external thread of the second end 220 is right-handed; the thread orientation of the external threads of the second end 220 is left-handed when the thread orientation of the internal threads of the first end 210 is right-handed.

Taking the thread turning direction of the internal thread of the first end 210 as left-hand rotation and the thread turning direction of the external thread of the second end 220 as right-hand rotation as an example, when the thread turning direction of the internal thread of the first end 210 is left-hand rotation, the external thread of the drill rod connector 100 mated with the first end 210 is left-hand rotation and the internal thread of the casing 400 mated with the external thread of the second end 220 is right-hand rotation, so that when the drill rod connector 100 is relatively rotated with respect to the first end of the casing connector 200, the drill rod connector 100 can be displaced with respect to the casing connector 200 in the casing axial direction, and the casing connector 200 and the casing 400 are kept fixed and sealed.

Optionally, when the casing connection member 200 of the cementing nipple 1 is fixed on the casing 400 and the drill rod connection member 100 is fixedly connected with the casing connection member 200, the drill rod connection member 100 may be lifted up and down, so that the drill rod connection member 100 drives the casing connection member 200 to move up, and further the casing 400 moves up and down, so as to improve the displacement efficiency and further improve the cementing quality.

Adopt the well cementation nipple that this embodiment provided, set up the internal thread through the first end towards the entry at bushing coupling spare 200, set up the external screw thread through the second end towards the export at bushing coupling spare 200, the bushing coupling spare 200 of being convenient for links to each other with drilling rod connecting piece 100, sleeve 400 respectively to realize the annular space's between drilling rod and the sleeve pipe sealed, further guarantee going on smoothly of well cementation process. The outer diameter of the second end 220 of the well cementation short section is larger than or equal to that of the first end 210, so that materials are saved, and the cost is reduced; by setting the internal threads of the first end 210 to be opposite to the thread direction of the external threads of the second end 220, the drill rod connector 100 can move relative to the casing connector 200 along the axial direction of the casing, so that the well cementation process can be smoothly carried out. Meanwhile, the drill rod connector 100 and the casing connector 200, the drill rod connector 100 and the drill rod 300, and the casing connector 200 and the casing 400 are in threaded connection, so that stable connection among all the components is ensured, and the operation is convenient.

Further, at least one seal is provided between drill pipe connection 100 and casing connection 200 to sealingly engage casing connection 200 with drill pipe connection 100.

In particular, the seal may be a sealing ring; a sealing groove arranged along the circumferential direction of the drill rod connecting piece 100 can be arranged on the drill rod connecting piece 100, and the sealing ring is fixed in the sealing groove; the inner wall of the first end 210 of the casing connector 200 may be provided with a sealing groove circumferentially disposed along the inner wall of the first end 210, and the sealing ring is fixed in the sealing groove.

Optionally, a sealing ring may be disposed between the drill pipe coupling 100 and the casing coupling 200, and the sealing ring may be disposed on the inner wall of the first end 210 of the casing coupling 200 or on the outer circumference of the drill pipe coupling 100, so that the casing coupling 200 is in sealing engagement with the drill pipe coupling 100.

Two sealing rings may be disposed between the drill pipe coupling 100 and the casing coupling 200, for example, both sealing rings may be disposed on the inner wall of the first end 210 of the casing coupling 200, and the two sealing rings are respectively disposed at two ends of the inner wall where the first end 210 is connected to the drill pipe coupling 100; two sealing rings may be disposed on the outer circumference of the drill rod connector 100, and the two sealing rings are disposed at two ends of the drill rod connector 100, which are in contact with the casing connector 200, respectively; two sealing rings may also be provided on drill pipe coupling 100 and casing coupling 200, respectively, to sealingly engage casing coupling 200 with drill pipe coupling 100.

According to the well cementation short section provided by the embodiment, at least one sealing element is arranged between the drill rod connecting piece 100 and the casing pipe connecting piece 200, so that the sealing between the casing pipe connecting piece 200 and the drill rod connecting piece 100 is conveniently realized, and the well cementation process is further ensured to be smoothly carried out.

Further, the inlet end of the drill rod connector 100 facing the inlet is provided with at least one sealing member to sealingly connect the drill rod connector 100 with the drill rod 300; the outlet end of drill pipe coupling 100 towards the outlet is provided with at least one seal to sealingly connect drill pipe coupling 100 to drill pipe 300.

In particular, the sealing element may be a sealing ring, in order to achieve a sealed connection between the two components.

Optionally, the inlet end of the drill rod connector 100 facing the inlet may be provided with a sealing ring, for example, the inlet end of the drill rod connector 100 facing the inlet is provided with a sealing groove, and the sealing ring is fixed on the sealing groove, so as to enable the drill rod connector 100 to be connected with the second drill rod 300 in a sealing manner; the outlet end of drill pipe coupling 100 facing the outlet may be provided with a sealing ring, for example, the outlet end of drill pipe coupling 100 facing the outlet may be provided with a sealing groove, and the sealing ring is fixed on the sealing groove, so that drill pipe coupling 100 and first drill pipe 300 are connected in a sealing manner.

Optionally, two sealing rings may be disposed at an inlet end of the drill rod connector 100 facing the inlet, for example, two sealing grooves are disposed at the inlet end of the drill rod connector 100 facing the inlet, the two sealing grooves are respectively located at two ends of the drill rod connector 100 contacting with the second drill rod 300, and the sealing rings are respectively fixed in the two sealing grooves, so that the drill rod connector 100 is in sealing connection with the second drill rod 300; the outlet end of the drill rod connector 100 facing the outlet may be provided with two sealing rings, for example, the outlet end of the drill rod connector 100 facing the outlet is provided with two sealing grooves, the two sealing grooves are respectively located at two ends of the drill rod connector 100 contacting with the first drill rod 300, and the two sealing grooves are respectively fixed with a sealing ring, so as to enable the drill rod connector 100 and the first drill rod 300 to be connected in a sealing manner.

The utility model provides a well cementation nipple joint, through be provided with at least one sealing member at drilling rod connecting piece 100 towards the entry end of entry, through be provided with at least one sealing member at drilling rod connecting piece 100 towards the exit end of export, be convenient for realize the sealing connection between drilling rod connecting piece 100 and the drilling rod 300 to realize the sealed of drilling rod 300, further guaranteed going on smoothly of well cementation process.

Further, an inlet end of the drill rod coupling 100 towards the inlet and/or an outlet end of the drill rod coupling 100 towards the outlet is threadedly connected to a respective drill rod 300.

Specifically, the inlet end of drill rod connector 100 facing the inlet is provided with a first thread, and optionally, the inlet end of drill rod connector 100 facing the inlet may be an internal thread or an external thread. When the inlet end of the drill rod connecting piece 100 facing the inlet is an internal thread, the outer circumference of the second drill rod 300 matched with the inlet end is provided with an external thread matched with the internal thread of the inlet end; when the inlet end of the drill rod connector 100 facing the inlet is externally threaded, the outer circumference of the second drill rod 300 matching the inlet end is provided with an internal thread matching the external thread of the inlet end.

The outlet end of drill rod coupling 100 facing the outlet is provided with a second thread, and optionally, the outlet end of drill rod coupling 100 facing the outlet may be an internal thread or an external thread. When the outlet end of the drill rod connecting piece 100 facing the outlet is an internal thread, an external thread matched with the internal thread of the outlet end is arranged on the outer circumference of the first drill rod 300 matched with the outlet end; when the outlet end of the drill rod connector 100 facing the outlet is externally threaded, the outer circumference of the first drill rod 300, which is fitted to the outlet end, is provided with an internal thread adapted to the external thread of the outlet end.

The cementing pup joint provided by the embodiment is convenient for realizing stable connection between the drill rod connecting piece 100 and the drill rod 300 by connecting the drill rod connecting piece 100 towards the inlet end of the inlet and/or the drill rod connecting piece 100 towards the outlet end with the corresponding drill rod 300 in a threaded manner, and is convenient for assembly and disassembly by using threads for connection.

Further, an elevator pipe section 110 is further disposed on the drill pipe connector 100, the elevator pipe section 110 is located between the inlet end of the drill pipe connector 100 and the casing connector 200, and the outer diameter of the elevator pipe section 110 is smaller than that of the inlet end.

Specifically, an elevator pipe section 110 is disposed on the drill pipe connector 100, and the elevator pipe section 110 is used for connecting an elevator, so that the elevator can hoist the drill pipe connector 100.

The elevator pipe section 110 is located between the inlet end of the drill pipe connection 100 and the casing connection 200, and the outer diameter of the elevator pipe section 110 is smaller than the outer diameter of the inlet end, so that the elevator hoists the drill pipe connection 100. A transition section can be arranged between the elevator pipe section 110 and the inlet end of the drill pipe connector 100, the outer wall of the transition section can be perpendicular to the axial direction, and the outer wall of the transition section can also have a preset included angle relative to the axial direction. When the outer wall of the transition section has a predetermined included angle with respect to the axial direction, the predetermined included angle may be designed according to the angle of the elevator, for example, when the angle of the elevator is 18 °, the predetermined included angle is 18 °. Optionally, the side wall of the elevator pipe section 110 may be a smooth side wall, and when the drill pipe connection 100 needs to be hoisted, the elevator may be hoisted to the position of the elevator pipe section 110, so as to suspend the drill pipe connection 100.

According to the well cementation short section provided by the embodiment, the drill pipe connecting piece 100 is provided with the elevator pipe section 110, the elevator pipe section 110 is arranged between the inlet end of the drill pipe connecting piece 100 and the casing pipe connecting piece 200, and the outer diameter of the elevator pipe section 110 is smaller than that of the inlet end, so that the elevator can suspend the drill pipe connecting piece 100 conveniently; meanwhile, when the elevator suspends the drill pipe connector 100 and moves upward, the drill pipe connector 100 drives the casing connector 200 to move upward, so that the casing 400 and the casing connector 200 move upward synchronously, the displacement efficiency is improved, and the well cementation quality is improved.

Further, a protective sleeve 500 is included, the protective sleeve 500 is sleeved on the drill pipe connector 100, and the protective sleeve 500 is located between the casing connector 200 and the outlet end of the drill pipe connector 100.

Specifically, as shown in fig. 5 and 6, protective casing 500 may be tubular and the inner circumference of protective casing 500 may be internally threaded to facilitate the installation of protective casing 500 over drill pipe connection 100. Optionally, there may be 1 or more than one protective casing 500, and when there are more than one protective casings 500, there may be a plurality of protective casings 500 evenly arranged between the casing connector 200 and the outlet end of the drill pipe connector 100.

By adopting the well cementation short section provided by the embodiment, before well cementation, the protective sleeve is fixedly sleeved on the drill rod connecting piece 100, then the outlet end of the drill rod connecting piece 100 is hermetically connected with the drill rod 300, in the connection process, the lower clamp of the hydraulic tong can be used for clamping the drill rod 300, then the upper clamp of the hydraulic tong is used for rotating the protective sleeve 500, and the drill rod connecting piece 100 rotates along with the protective sleeve 500, so that the outlet end of the drill rod connecting piece 100 is connected with the first drill rod 300.

The utility model provides a well cementation nipple joint, through establish protective sheath 500 on drilling rod connecting piece 100 to the injury that protection drilling rod connecting piece 100 does not receive the chain tong centre gripping is favorable to improving drilling rod connecting piece 100's life.

Further, casing 500 is threadably connected to drill pipe connection 100.

Specifically, an internal thread is provided on the inner wall of protective sleeve 500, an external thread is provided on the outer circumference of drill pipe connector 100, and the internal thread of protective sleeve 500 is adapted to the external thread on drill pipe connector 100, so as to fix protective sleeve 500 on drill pipe connector 100, and when protective sleeve 500 needs to be replaced, it is convenient to take off protective sleeve 500.

Further, a wedge-shaped groove is formed in the protective sleeve 500, a rectangular groove 120 is formed in the drill rod connecting piece 100, the upper end, facing the inlet, of the rectangular groove 120 is higher than the upper end of the wedge-shaped groove, the part of the rectangular groove 120 is communicated with the wedge-shaped groove, and a transmission key 510 is arranged in the rectangular groove 120 and the wedge-shaped groove, so that the protective sleeve 500 and the drill rod connecting piece 100 synchronously rotate.

Specifically, the driving key 510 includes a rectangular portion 511 and a wedge portion 512, wherein the rectangular portion has a rectangular cross section, and the wedge portion 512 has a wedge cross section, and optionally, the rectangular portion 511 and the wedge portion 512 may be integrally formed.

The outer wall of the drill rod connecting piece 100 connected with the protective sleeve 500 is provided with a rectangular groove 120, and the upper end of the rectangular groove 120 towards the inlet end direction of the drill rod connecting piece 100 towards the inlet is higher than the upper end of the wedge-shaped groove, it can be understood that the rectangular groove 120 extends out of the upper end face of the protective sleeve 500 towards the upper end of the drill rod connecting piece 100 towards the inlet end direction of the inlet for a preset distance, so that the transmission key 510 is inserted into the rectangular groove 120 and the wedge-shaped groove.

The inner wall of protective sheath 500 and drill pipe connector 100 is provided with a wedge-shaped groove, and the wedge-shaped groove runs through the up end and the lateral wall of protective sheath 500, and from protective sheath 500 towards the inner wall to the outer wall of drill pipe connector 100, the opening of wedge-shaped groove diminishes gradually.

The rectangular portion 511 of the driving key 510 is inserted into the rectangular slot 120, and the wedge portion 512 is inserted into the wedge slot. After protective sheath 500 sealed the back on drilling rod connecting piece 100 through the screw thread, the wedge groove of protective sheath 500 is relative with the rectangular channel 120 of drilling rod connecting piece 100, rectangular channel 120 of drilling rod connecting piece 100 stretches out a section distance for the up end of protective sheath 500, so that the rectangle portion 511 of transmission key inserts the section that rectangular channel 120 stretches out, and the wedge portion of transmission key is corresponding to the wedge groove, then the transmission key that slides downwards, make the rectangle portion of transmission key peg graft in the rectangular channel, the wedge portion peg graft in the wedge groove, so that protective sheath 500 and drilling rod connecting piece 100 synchronous rotation.

Optionally, the drive key 510 further comprises a protrusion connected to the wedge-shaped portion, the protrusion being located at an end of the wedge-shaped portion 512 remote from the rectangular portion 511, the protrusion protruding from an outer wall of the sheath 500. When the transmission key 510 is inserted into the rectangular groove 120 and the wedge-shaped groove, the extending part can be knocked down by using a hammer, so that the wedge-shaped part of the transmission key 510 is knocked into the wedge-shaped groove; when the transmission key 510 is pulled out, the extending part can be knocked by using a hammer from bottom to top, so that the wedge-shaped part of the transmission key 510 is knocked out of the wedge-shaped groove, and the transmission key is convenient to disassemble and assemble.

By adopting the well cementation short section provided by the embodiment, after the protective sleeve 500 is sleeved on the drill pipe connecting piece 100 through threads, the wedge-shaped groove of the protective sleeve 500 is opposite to the rectangular groove 120 on the drill pipe connecting piece 100; the driving key 510 is inserted between the wedge-shaped groove of the jacket 500 and the rectangular groove 120 of the drill rod connection member 100, so that the jacket 500 and the drill rod connection member 100 rotate synchronously.

According to the well cementation short section provided by the embodiment, the wedge-shaped groove is formed in the protective sleeve 500, the rectangular groove 120 is formed in the drill rod connecting piece 100, and the transmission key 510 is arranged in the rectangular groove 120 and the wedge-shaped groove, so that the protective sleeve 500 and the drill rod connecting piece 100 can rotate synchronously; meanwhile, by setting the upper end of the rectangular groove 120 toward the entrance to be higher than the upper end of the wedge-shaped groove, and the portion of the rectangular groove 120 communicates with the wedge-shaped groove, it is convenient to insert the transmission key 510 in the rectangular groove 120 and the wedge-shaped groove.

In another aspect, the present application provides a fixation device comprising: at least two drill pipes 300, wherein at least two adjacent drill pipes 300 are connected with the cementing short joint 1 of any one of the above embodiments.

In particular, when the fixture comprises two drill rods 300, the two drill rods 300 are referred to herein as a first drill rod and a second drill rod, the first drill rod is connected to the inlet end of the drill rod connection 100 in the cementing sub 1 towards the inlet, the second drill rod is connected to the outlet end of the drill rod connection 100 in the cementing sub 1 towards the outlet, and the casing connection 200 in the cementing sub 1 is sealingly connected to the casing 400 to effect sealing of the annular space between the casing and the drill rods.

When the fixing device comprises three drill rods 300, the three drill rods 300 are referred to herein as a third drill rod, a fourth drill rod and a fifth drill rod, wherein a first cementing sub 1 is connected between the third drill rod and the fourth drill rod, and a second cementing sub 1 is connected between the fourth drill rod and the fifth drill rod. For example, the third drill rod is connected with the inlet end, facing the inlet, of the drill rod connecting piece 100 in the first well cementation nipple 1, and the upper end of the fourth drill rod is connected with the outlet end, facing the outlet, of the drill rod connecting piece 100 in the first well cementation nipple 1; the lower end of the fourth drill rod is connected with the inlet end, facing the inlet, of the drill rod connecting piece 100 in the second cementing sub 1, and the outlet end, facing the outlet, of the drill rod connecting piece 100 in the second cementing sub 1 is connected with the upper end of the fifth drill rod. Meanwhile, the casing connection piece 200 of the first cementing nipple 1 is connected with the upper end of the casing 400 in a sealing manner, and the casing connection piece 200 of the second cementing nipple 1 is connected with the casing 400 in a sealing manner. The structure of the well cementation short section 1 in the embodiment is the same as that of the well cementation short section 1 in the above embodiment, and is not described again here.

According to the well cementation device provided by the embodiment, the well cementation short section 1 is connected between at least two adjacent drill rods 300, so that the annular space between the casing 400 and the drill rods 300 can be sealed, and the well cementation process is guaranteed to be smoothly carried out.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means 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 present disclosure. In this specification, the schematic representations of the terms used above do not necessarily 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.

It will be appreciated that the present disclosure has shown some embodiments, but those skilled in the art will appreciate that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A well cementation nipple, comprising: drill pipe connectors and casing connectors; the two ends of the drill rod connecting piece are used for being connected with a drill rod in a sealing mode, a first flow passage for allowing fluid to pass through is formed inside the drill rod connecting piece, the first flow passage is provided with an inlet and an outlet, and the first flow passage is communicated with the drill rod through the inlet and the outlet; the casing pipe connecting piece is sleeved on the drill rod connecting piece, the casing pipe connecting piece is in sealing fit with the drill rod connecting piece, and the casing pipe connecting piece is used for being in sealing fit with the casing pipe.

2. The cementing sub of claim 1, wherein a first end of the casing connection towards the inlet is provided with internal threads to threadedly connect with the drill pipe connection;

the second end of the sleeve connecting piece facing the outlet is provided with external threads so as to be in threaded connection with the sleeve;

wherein the outer diameter of the second end is larger than or equal to the outer diameter of the first end, and the thread direction of the internal thread of the first end is opposite to that of the external thread of the second end, so that the drill rod connecting piece can generate displacement along the axial direction of the casing relative to the casing connecting piece.

3. The cementing sub of claim 1, wherein at least one seal is provided between the drill pipe connection and the casing connection to sealingly engage the casing connection with the drill pipe connection.

4. The cementing sub of claim 1, wherein the drill pipe connection is provided with at least one seal towards an inlet end of the inlet port to sealingly connect the drill pipe connection with the drill pipe;

the outlet end of the drill rod connecting piece facing the outlet is provided with at least one sealing piece so as to enable the drill rod connecting piece to be connected with the drill rod in a sealing mode.

5. The cementing sub of claim 1, wherein an inlet end of the drill pipe connection towards the inlet and/or an outlet end of the drill pipe connection towards the outlet is threadedly connected with a respective drill pipe.

6. The cementing sub of claim 1, wherein the drill pipe connector is further provided with an elevator pipe section, the elevator pipe section is located between the inlet end of the drill pipe connector and the casing connector, and the outer diameter of the elevator pipe section is smaller than that of the inlet end.

7. The cementing sub according to any one of claims 1 to 6, further comprising a protective sleeve that is fitted over the drill pipe connector and is located between the casing connector and the outlet end of the drill pipe connector.

8. The cementing sub of claim 7, wherein the casing is threadedly connected to the drill pipe connection.

9. The well cementation sub of claim 8, wherein the protective casing is provided with a wedge-shaped groove, the drill pipe connecting piece is provided with a rectangular groove, the upper end of the rectangular groove facing the inlet is higher than the upper end of the wedge-shaped groove, the part of the rectangular groove is communicated with the wedge-shaped groove, and a transmission key is arranged in the rectangular groove and the wedge-shaped groove, so that the protective casing and the drill pipe connecting piece synchronously rotate.

10. A fixation device, comprising: at least two drill pipes, wherein at least two adjacent drill pipes are connected with a cementing sub according to any one of the claims 1 to 9.

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