Circulation manifold built-in rotating cement head

Abstract

The present invention is a rotary cement head with built-in circulation manifold, comprising a cement head body, a lifting short circuit is arranged on the top of the cement head body, the bottom of the cement head body is sealed and connected to the lower outer cylinder, and the lower outer cylinder can rotate relative to the cement head body; a main flow channel and a secondary flow channel are arranged axially in the cement head body, a lower cylinder flow channel is arranged axially through the lower outer cylinder, a rotary valve is arranged at the bottom of the main flow channel and the secondary flow channel, and the rotary valve can rotate to connect the main flow channel or the secondary flow channel with the lower cylinder flow channel; an injection union is arranged on the side wall of the secondary flow channel above the rotary valve, and the top of the main flow channel and the secondary flow channel are arranged to be connected; the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure. The present invention has a built-in circulation manifold, the overall width of the cement head is small, the center of gravity and the center of rotation coincide, and the rotation radius is small; the channel switching is convenient, and the plugging speed is fast; the lower outer cylinder and the cement head body can rotate relative to each other under pressure to realize rotary casing cementing and improve cementing quality.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas equipment, and in particular to a circulating manifold built-in rotating cement head. Background Art

[0002] The cement head is mainly used for cementing operations. It is installed on the top of the casing and is a cementing device that connects the casing and the ground manifold. The cement head can be used to complete operations such as circulation, injecting isolation fluid, injecting cement slurry, releasing rubber plugs, placing seat sealing balls, and replacing mud. It is the main hub of the ground manifold wellhead for cementing operations.

[0003] At present, the conventional rotary table driving cement head structure 91 (such as Fig. 9 As shown in the figure, the circulation manifold 92 is connected to the cement head body by welding or threading, and the flow channel is switched by opening and closing the circulation manifold plug valve 93, so that the cement head can complete the injection of various liquids. The screw rotary stopper structure 94 is fixed on the side of the cement head body, and the stopper pin is extended and retracted by rotating the hand wheel. When the stopper pin is retracted, the rubber plug is released.

[0004] The commonly used cement heads are externally connected with a circulation manifold, which causes the center of gravity to be not on the rotation center of the cement head. When the cement head is connected to the pipe column, it is difficult to align the buckle during buckling, which easily causes buckle wear. In addition, the external circulation manifold increases the overall width of the cement head and the rotation radius is very large.

[0005] Conventional cement heads use a screw-rotating stopper pin structure. During cementing construction, it takes 10-13 turns to open the stopper pin. During operation, it is necessary to remember the number of turns of the hand wheel, which is prone to errors and time-consuming. The following phenomena are also prone to occur: 1) The stopper pin is not fully opened, causing the rubber plug to fail to descend normally and the plugging speed to be slow; 2) When the stopper pin is not fully opened, the rubber plug descends at the same time due to the pressure difference, causing the rubber plug sealing ring to be damaged. The traditional screw-rotating stopper pin structure is not easy to achieve automatic control, which makes it difficult to upgrade the cement head automation and remote plugging.

[0006] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a circulating manifold built-in rotary cement head to overcome the defects of the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a rotary cement head with built-in circulation manifold, which solves the problems in the prior art that the rotary cement head is externally connected to the circulation manifold, has a large rotation radius, and the plugging mechanism is a pin-type structure, and it is necessary to remember the number of turns of the hand wheel during operation, which is easy to make mistakes, has a slow plugging speed, and is not convenient for remote control. The present invention has a built-in circulation manifold, a small overall width of the cement head, the center of gravity and the center of rotation coincide, and a small rotation radius; a rotary valve changes the connection state, the channel switching is convenient, and the plugging speed is fast; the lower outer cylinder can rotate relative to the cement head body, and the relative rotation under pressure between the two can be realized, thereby realizing rotary casing cementing and improving cementing quality.

[0008] The object of the present invention is achieved in this way. A circulating manifold built-in rotary cement head comprises a cement head body, the top of the cement head body is detachably provided with a lifting short circuit, the bottom of the cement head body is sealed and connected to a lower outer cylinder, and the lower outer cylinder can rotate relative to the cement head body; a main flow channel and a secondary flow channel are axially arranged in the cement head body, a lower cylinder flow channel is axially penetrated in the lower outer cylinder, a rotary valve is arranged at the bottom of the main flow channel and the secondary flow channel, and the rotary valve can rotate to connect the main flow channel or the secondary flow channel with the lower cylinder flow channel ; The secondary flow channel is located on the side wall above the rotary valve and is connected to an injection union, and the top of the main flow channel and the secondary flow channel are connected; the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure; a rubber plug can be inserted into the main flow channel, and the main flow channel, the rotary valve and the lower tube flow channel can be connected to form a cement head plugging channel; the secondary flow channel, the rotary valve and the lower tube flow channel can be connected to form a cement head injection channel, and the cement head plugging channel and the cement head injection channel switch the flow state through the rotary valve.

[0009] In a preferred embodiment of the present invention, a first through hole, a second through hole and a third through hole are arranged on the rotary valve, the second through hole is obliquely arranged on the side wall of the first through hole, and the second through hole is used to connect the secondary flow channel and the first through hole; the third through hole is throughly arranged on a side wall of the first through hole; the first through hole can axially penetrate and connect the main flow channel with the lower tube flow channel, or the first through hole can radially connect the secondary flow channel, the second through hole and the third through hole, and the lower tube flow channel.

[0010] In a preferred embodiment of the present invention, the circumferential angle between the first through hole and the third through hole is 90°, and the rotary valve can be rotated 90° to connect the cement head plugging channel or the cement head injection channel.

[0011] In a preferred embodiment of the present invention, the central axis of the rotary valve is arranged perpendicular to the central axis of the cement head body, the axial ends of the rotary valve are respectively hinged on the side walls of the cement head body, and a rotation limiting structure is arranged at one axial end of the rotary valve.

[0012] In a preferred embodiment of the present invention, a first mounting through hole and a second mounting through hole are provided on the side wall of the cement head body, the first mounting through hole is sealed and connected to the side cover, a third mounting through hole is provided on the side cover, one axial end of the rotary valve is hinged in the third mounting through hole, and the other axial end of the rotary valve is hinged to the second mounting through hole; the rotation limiting structure includes a rotating wheel and a limiting pin, the rotating wheel is fixedly connected to one axial end of the rotary valve, a rotating notch is provided on the rotating wheel, and the limiting pin is provided on the side cover, and one circumferential end or the other end of the rotating notch can be in contact with the limiting pin.

[0013] In a preferred embodiment of the present invention, one end of the rotating wheel away from the rotary valve extends out of the third mounting through hole, and a handwheel interface is provided at one end of the rotating wheel away from the rotary valve.

[0014] In a preferred embodiment of the present invention, a first bearing is arranged between one axial end of the rotary valve and the third mounting through hole, and a second bearing is arranged between the other axial end of the rotary valve and the second mounting through hole.

[0015] In a preferred embodiment of the present invention, the circumferential angle of the rotating notch is 90°.

[0016] In a preferred embodiment of the present invention, the first end of the lifting short circuit is detachably connected to the cement head body; the lifting short circuit is provided with a transition cavity inward from the first end, a partition is provided in the transition cavity, a guide hole is provided on the partition, and the guide hole can connect the main flow channel and the secondary flow channel from the top.

[0017] In a preferred embodiment of the present invention, the top of the lower outer cylinder is sleeved in the cement head body, a third bearing is arranged between the lower outer cylinder and the cement head body, the bottom end of the cement head body is detachably connected to the bottom cover, the bottom cover axially fixes the third bearing, and the lower outer cylinder rotates through the bottom cover.

[0018] As described above, the circulating manifold built-in rotary cement head of the present invention has the following beneficial effects:

[0019] In the rotary cement head with built-in circulation manifold of the present invention, the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure. The rotary cement head with built-in circulation manifold no longer has an external circulation manifold, the overall width of the cement head is small, the center of gravity and the center of rotation coincide, and the rotation radius is small; the rotary valve changes the connection state, so as to realize the switching of the cement head plugging channel and the cement head injection channel, meet the needs of plugging and unplugging states, and the channel switching is convenient and the plugging speed is fast; the rotary valve adopts a 90° rotating structure, the plugging speed is fast, the rotation angle is accurate, and it is convenient for remote control; the injection union is in a low position on the side, so that the injection pipeline can be installed in a low position, reducing the difficulty of connecting the manifold on site; the lower outer cylinder can rotate relative to the cement head body, so that the two can be relatively rotated under pressure, thereby realizing rotary casing cementing and improving cementing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0021] Figure 1 : It is a structural schematic diagram of the built-in rotary cement head of the circulation manifold of the present invention when no plug is put in.

[0022] Figure 2 : It is a structural schematic diagram of the built-in rotary cement head of the circulation manifold of the present invention when plugging.

[0023] Figure 3 :for Figure 1 Enlarged view of point A in the middle.

[0024] Figure 4 :for Figure 1 Enlarged view of point B in the middle.

[0025] Figure 5 :for Figure 1 Enlarged view of point C in the middle.

[0026] Figure 6 :for Figure 1 Center D view.

[0027] Figure 7 :for Figure 2 Middle E view.

[0028] Figure 8 : is the structural diagram of the rotary valve of the present invention.

[0029] Fig. 9 : Schematic diagram of the traditional turntable driven cement head structure.

[0030] In the figure:

[0031] 100. Built-in rotating cement head in circulation manifold;

[0032] 1. Improve the short circuit;

[0033] 11. transition chamber; 12. partition; 121. flow guide hole; 13. fourth sealing ring; 14. second bolt;

[0034] 2. Cement head body;

[0035] 21. Main flow channel; 22. Secondary flow channel; 23. Side cover; 24. Rotating wheel; 241. Rotating notch; 242. Hand wheel interface; 243. First bolt; 25. Limit pin; 26. First bearing; 27. Second bearing; 281. First sealing ring; 282. Second sealing ring; 283. Third sealing ring; 29. ​​Bottom cover; 291. Third bolt;

[0036] 3. Lower outer cylinder; 31. Lower cylinder flow channel; 32. Third bearing;

[0037] 4. Rotary valve; 41. First through hole; 42. Second through hole; 43. Third through hole;

[0038] 5. Injection union; 51. Fourth bolt;

[0039] 6. Rubber plug;

[0040] 91. Conventional turntable driven cement head structure; 92. Circulation manifold; 93. Circulation manifold plug valve; 94. Screw rotary stop pin structure. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0042] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] like Figures 1 to 8 As shown, the present invention provides a circulating manifold built-in rotary cement head 100, comprising a cement head body 2, a lifting short circuit 1 can be detachably arranged on the top of the cement head body 2, a lower outer cylinder 3 is sealed and connected to the bottom of the cement head body 2, and the lower outer cylinder 3 can rotate relative to the cement head body 2; the lower outer cylinder 3 is used to rotate with the drilling tool assembly in the wellbore; the lower part of the lower outer cylinder 3 is connected to the kelly (existing technology), the kelly is driven by the rotary table (existing technology), the lower part of the kelly is connected to the pipe string, and the rotation power of the lower outer cylinder 3 comes from the rotary table;

[0045] A main flow channel 21 and a secondary flow channel 22 are axially arranged in the cement head body 2, and a lower tube flow channel 31 is axially arranged in the lower outer tube 3. A rotary valve 4 is arranged at the bottom of the main flow channel 21 and the secondary flow channel 22. The rotary valve 4 can rotate to connect the main flow channel 21 or the secondary flow channel 22 with the lower tube flow channel 31; an injection union 5 is arranged on the side wall of the secondary flow channel 22 above the rotary valve 4, that is, the injection union 5 is at a low position on the side, so that the injection pipeline can be installed at a low position, reducing the difficulty of connecting the manifold on site; the top of the main flow channel 21 and the secondary flow channel 22 It is arranged to be connected; the main flow channel 21, the secondary flow channel 22 and the rotary valve 4 form a built-in circulation manifold structure; the rubber plug 6 can be put into the main flow channel 21, and the main flow channel 21, the rotary valve 4 and the lower tube flow channel 31 can be connected to form a cement head plugging channel; the secondary flow channel 22, the rotary valve 4 and the lower tube flow channel 31 can be connected to form a cement head injection channel, and the cement head plugging channel and the cement head injection channel switch the flow state through the rotary valve 4, and only one of the cement head plugging channel and the cement head injection channel is in a connected state, and the other is in a closed state.

[0046] The built-in rotating cement head 100 in the circulation manifold has two usage states, an unplugged state and a plugged state. In the plugged state, the rotary valve 4 is in a state of connecting the main flow channel 21 and the lower tube flow channel 31, and the cement head plugging channel (main flow channel 21, rotary valve 4 and lower tube flow channel 31) is connected; in the unplugged state, the rotary valve 4 is in a state of connecting the secondary flow channel 22 and the lower tube flow channel 31, and the cement head injection channel (secondary flow channel 22, rotary valve 4 and lower tube flow channel 31) is connected.

[0047] The main flow channel 21, the secondary flow channel 22 and the rotary valve 4 form a built-in circulation manifold structure. The rotary cement head 100 with built-in circulation manifold no longer has an external circulation manifold. The overall width of the cement head is small, the center of gravity of the cement head coincides with the center of rotation, and the rotation radius is small.

[0048] After the conventional cement head is connected to the casing, it cannot rotate; in the circulating manifold built-in rotary cement head 100 of the present invention, the lower outer cylinder 3 is rotatably connected to the bottom of the cement head body 2 to achieve relative rotation under pressure between the two, thereby achieving rotary casing cementing and improving cementing quality.

[0049] In the rotary cement head with built-in circulation manifold of the present invention, the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure. The rotary cement head with built-in circulation manifold no longer has an external circulation manifold, the overall width of the cement head is small, the center of gravity and the center of rotation coincide, and the rotation radius is small; the rotary valve changes the connection state, so as to realize the switching of the cement head plugging channel and the cement head injection channel, meet the needs of plugging and unplugging states, and the channel switching is convenient and the plugging speed is fast; the injection union is in a low position on the side, so that the injection pipeline can be installed at a low position, reducing the difficulty of connecting the manifold on site; the lower outer cylinder can rotate relative to the cement head body, so that the two can be relatively rotated under pressure, thereby realizing rotary casing cementing and improving cementing quality.

[0050] Further, if Figure 1 , Figure 2 , Figure 8 As shown, the rotary valve 4 is provided with a first through hole 41, a second through hole 42 and a third through hole 43, the second through hole is obliquely provided on the side wall of the first through hole, and the second through hole is used to connect the secondary flow channel and the first through hole; the third through hole 43 is provided through a side wall of the first through hole 41; the first through hole 41 can axially connect the main flow channel 21 with the lower tube flow channel 31, or the first through hole 41 can radially connect the secondary flow channel 22, the second through hole 42 and the third through hole 43, and the lower tube flow channel 31. The apertures of the first through hole 41 and the third through hole 43 are set larger than the outer diameter of the rubber plug, so that the rubber plug can smoothly pass through and descend.

[0051] Further, if Figure 1 As shown, the circumferential angle between the first through hole 41 and the third through hole 43 is 90°, and the rotary valve 4 can rotate 90° to connect the cement head plugging channel or the cement head injection channel. The rotary valve 4 can be in two states, one is that the first through hole 41 axially connects the main channel 21 and the lower tube channel 31 for plugging operations; the other is that the rotary valve 4 rotates 90° clockwise or counterclockwise, so that the first through hole 41 can radially connect the secondary channel 22, the second through hole 42 and the third through hole 43, and the lower tube channel 31 for non-plugging operations. The 90° rotary valve structure has a fast plugging speed, a precise rotation angle, and is convenient for remote control.

[0052] Further, if Figure 1 As shown, the central axis of the rotary valve 4 is arranged perpendicularly to the central axis of the cement head body 2, the axial ends of the rotary valve 4 are respectively hinged to the side walls of the cement head body 2, and a rotation limiting structure is arranged at one axial end of the rotary valve 4.

[0053] Further, if Figure 1 , Figure 2 As shown, a first mounting through hole and a second mounting through hole are provided on the side wall of the cement head body 2, the first mounting through hole is sealed and connected to the side cover 23, a third mounting through hole is provided on the side cover 23, one axial end of the rotary valve 4 is hinged in the third mounting through hole, and the other axial end of the rotary valve 4 is hinged in the second mounting through hole; Figure 1 , Figure 2 , Figure 5 As shown, the rotation limiting structure includes a rotating wheel 24 and a limiting pin 25, which are fixedly connected to one axial end of the rotary valve 4. A rotating notch 241 is provided on the rotating wheel 24, and the limiting pin 25 is provided on the side cover 23. One or the other circumferential end of the rotating notch 241 can abut against the limiting pin 25. The side cover 23 limits the axial position of the rotary valve 4. The limiting pin 25 plays a role in limiting the rotation angle of the rotating wheel 24, and further plays a role in limiting the rotation angle of the rotary valve 4.

[0054] In this embodiment, if Figure 5 As shown, the rotating wheel 24 is connected to one axial end of the rotary valve 4 by a first bolt 243 to prevent the rotating wheel 24 from falling. One axial end of the rotary valve 4 and the combined part of the rotating wheel 24 are sleeved together by a square or hexagonal structure, and the external rotating torque applied to the rotating wheel 24 can be transmitted to the rotary valve 4 through the square or hexagonal structure.

[0055] Further, if Figure 5 As shown, the end of the rotating wheel 24 away from the rotary valve extends out of the third mounting through hole, and the end of the rotating wheel away from the rotary valve is provided with a handwheel interface 242, and a handwheel or a swing actuator is installed through the handwheel interface 242 for driving (existing technology). The driving power of the rotating wheel 24 can be a handwheel, which is manually rotated, or a swing actuator, which drives the rotating wheel through pneumatic control or electrical control.

[0056] Further, if Figure 1 , Figure 2 As shown, a first bearing 26 is arranged between one axial end of the rotary valve 4 and the third mounting through hole, and a second bearing 27 is arranged between the other axial end of the rotary valve 4 and the second mounting through hole. The first bearing 26 and the second bearing 27 are used to reduce the friction resistance during the rotation of the rotary valve 4, and the first bearing 26 and the second bearing 27 are made of low-friction materials such as polytetrafluoroethylene and bronze.

[0057] like Figure 6 , Figure 7As shown, in a specific embodiment of the present invention, the circumferential angle of the rotating notch 241 is 90°. The stop pin 25 is installed in the 90° rotating notch 241 (slot) of the rotating wheel 24, and the rotating wheel 24 can only rotate 90°. With the above structure, the rotary valve 4 can only rotate 90° clockwise or 90° counterclockwise. The switching of the plugging state can be achieved by rotating 90°, and the control system is more convenient than the conventional screw rotating stop pin structure.

[0058] To ensure the sealing connection between the rotary valve 4 and the cement head body 2, Figure 1 , Figure 2 , Figure 5 As shown, a first sealing ring 281 is arranged between one axial end of the rotary valve 4 and the third mounting through hole, a second sealing ring 282 is arranged between the other axial end of the rotary valve 4 and the second mounting through hole, and a third sealing ring 283 is arranged between the side cover 23 and the first mounting through hole.

[0059] Further, if Figure 1 , Figure 2 As shown, the first end of the lifting short circuit 1 can be detachably connected to the cement head body 2. When installing the rubber plug 6, the lifting short circuit 1 is removed. In one embodiment, the lifting short circuit 1 is connected to the cement head body 2 by threads. To ensure the sealing of the connection, a fourth sealing ring 13 is arranged between the lifting short circuit 1 and the cement head body 2; the lifting short circuit 1 is provided with a transition chamber 11 from the first end to the inside, and a partition 12 is arranged in the transition chamber 11. The partition 12 is provided with a guide hole 121, and the guide hole 121 can connect the main flow channel 21 and the secondary flow channel 22 from the top. The partition 12 and the guide hole 121 play a role in fluid guidance. In this embodiment, the partition 12 is connected to the top of the cement head body 2 by a second bolt 14.

[0060] Further, if Figure 1 , Figure 2 , Figure 4 As shown, the top of the lower outer cylinder 3 is sleeved in the cement head body 2, and a third bearing 32 is arranged between the lower outer cylinder 3 and the cement head body 2. The bottom end of the cement head body 2 can be detachably connected to the bottom cover 29, and the bottom cover 29 axially fixes the third bearing 32, and the lower outer cylinder 3 rotates through the bottom cover 29. In this embodiment, the bottom cover 29 is connected to the bottom end of the cement head body 2 by the third bolt 291. The lower outer cylinder 3 is rotatably connected to the bottom end of the cement head body 2, and the pressure-carrying rotation between the lower outer cylinder 3 and the cement head body 2 can be realized. The power for the rotation of the lower outer cylinder 3 comes from the lower turntable (existing technology). When the lower outer cylinder 3 is subjected to the rotational power from the turntable, the cement head body 2 does not rotate, and the lower outer cylinder 3 rotates together with the drilling tool assembly in the wellbore to realize rotary casing cementing.

[0061] like Figure 1 , Figure 2 , Figure 3As shown, in this embodiment, the injection union 5 is connected to the cement head body 2 by a fourth bolt 51, and the injection union 5 is connected to an external cementing pipeline to achieve the injection of various fluids. The injection union 5 can enable the injection pipeline to be installed at a low position on the side, reducing the difficulty of connecting the manifold on site.

[0062] There are two working states of the internal rotary cement head 100 of the circulation manifold, namely, the unplugged state (such as Figure 1 as shown) and the plugging state (as shown Figure 2 shown).

[0063] like Figure 1 As shown, the built-in rotary cement head 100 in the circulation manifold is in an unplugged state, the main flow channel 21 and the first through hole 41 of the rotary valve are in a disconnected state, and the rotary valve 4 does not allow the plug 6 to pass through; the secondary flow channel 22, the second through hole 42, the first through hole 41, and the third through hole 43 are in a connected state; at this time, when the mud enters from the injection union 5, it flows through the secondary flow channel 22, the second through hole 42, the first through hole 41, and the third through hole 43 in sequence to the lower tube flow channel 31, and then flows to the drill string.

[0064] like Figure 2 As shown, the built-in rotary cement head 100 in the circulation manifold is in a plugging state. On the basis of the aforementioned non-plugging state, the rotary valve 4 is rotated 90°, the main flow channel 21 is connected with the first through hole 41 of the rotary valve, and the secondary flow channel 22 is not connected with the second through hole 42; the mud enters from the injection union 5, the mud goes up through the guide hole 121 of the partition 12, and then goes down through the main flow channel 21, driving the rubber plug 6 to go down, and flows to the drill string through the lower tube flow channel 31 to achieve plugging.

[0065] The use process of the circulating manifold built-in rotary cement head 100 of the present invention is as follows:

[0066] Remove the lifting short circuit 1 from the cement head body 2, rotate the rotary valve 4 so that the main flow channel 21 and the first through hole 41 of the rotary valve are in a disconnected state, and the secondary flow channel 22, the second through hole 42, the first through hole 41, and the third through hole 43 are in a connected state; install the rubber plug 6 in the main flow channel 21, connect the lifting short circuit 1 to the top of the cement head body 2, and install the circulating manifold built-in rotary cement head 100 at the wellhead.

[0067] When plugging is not required, cementing fluid enters through the injection union 5 and flows downward along the secondary flow channel 22 ( Figure 1 ), flows through the second through hole 42, the first through hole 41, and the third through hole 43 in sequence to flow into the lower tube flow channel 31, and then flows to the drill string.

[0068] When the rubber plug needs to be put in, the rotary valve 4 is rotated 90°, the main flow channel 21 is connected to the first through hole 41 of the rotary valve, and the secondary flow channel 22 is not connected to the second through hole 42; the mud enters from the injection union 5, the mud goes up through the guide hole 121 of the partition 12, and then goes down through the main flow channel 21, and the fluid flows downward along the main flow channel 21 ( Figure 2 The rubber plug 6 moves downward (in the direction of the arrow in the figure), and the rubber plug 6 passes downward through the rotary valve 4 under the action of the fluid, thereby releasing the rubber plug 6.

[0069] The upper end of the internal rotary cement head 100 of the circulation manifold can be lifted by the lifting card through the lifting short circuit 1, and the lower end can be driven by the rotary table to rotate by connecting the square drill rod.

[0070] As described above, the circulating manifold built-in rotary cement head of the present invention has the following beneficial effects:

[0071] In the rotary cement head with built-in circulation manifold of the present invention, the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure. The rotary cement head with built-in circulation manifold no longer has an external circulation manifold, the overall width of the cement head is small, the center of gravity and the center of rotation coincide, and the rotation radius is small; the rotary valve changes the connection state, so as to realize the switching of the cement head plugging channel and the cement head injection channel, meet the needs of plugging and unplugging states, and the channel switching is convenient and the plugging speed is fast; the rotary valve adopts a 90° rotating structure, the plugging speed is fast, the rotation angle is accurate, and it is convenient for remote control; the injection union is in a low position on the side, so that the injection pipeline can be installed in a low position, reducing the difficulty of connecting the manifold on site; the lower outer cylinder can rotate relative to the cement head body, so that the two can be relatively rotated under pressure, thereby realizing rotary casing cementing and improving cementing quality.

[0072] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rotary cement head with built-in circulation manifold, characterized in that: The invention comprises a cement head body, the top of which is detachably provided with a lifting short circuit, the bottom of which is sealed and connected with a lower outer cylinder, and the lower outer cylinder can rotate relative to the cement head body; a main flow channel and a secondary flow channel are axially arranged in the cement head body, a lower cylinder flow channel is axially arranged in the lower outer cylinder, a rotary valve is arranged at the bottom of the main flow channel and the secondary flow channel, and the rotary valve can rotate to make the main flow channel or the secondary flow channel communicate with the lower cylinder flow channel; an injection union is arranged on the side wall of the secondary flow channel above the rotary valve, and the tops of the main flow channel and the secondary flow channel are arranged to be communicated; the main flow channel, the secondary flow channel and the rotary valve form a built-in circulation manifold structure; a rubber plug can be inserted into the main flow channel, and the main flow channel, the rotary valve and the lower cylinder flow channel can be communicated to form a cement head plugging channel; the secondary flow channel, the rotary valve and the lower cylinder flow channel can be communicated to form a cement head liquid injection channel, and the cement head plugging channel and the cement head liquid injection channel switch the flow state through the rotary valve; The rotary valve is provided with a first through hole, a second through hole and a third through hole, wherein the second through hole is obliquely provided on a side wall of the first through hole, and the second through hole is used to connect the secondary flow channel with the first through hole; the third through hole is through-through provided on a side wall of the first through hole; the first through hole can axially connect the primary flow channel with the lower tube flow channel, or the first through hole can radially connect the secondary flow channel, the second through hole with the third through hole and the lower tube flow channel; The circumferential angle between the first through hole and the third through hole is 90°, and the rotary valve can be rotated 90° to connect the cement head plugging channel or the cement head injection channel; A rotation limiting structure is provided at one axial end of the rotary valve; A first mounting through hole and a second mounting through hole are provided on the side wall of the cement head body, the first mounting through hole is sealedly connected to a side cover, a third mounting through hole is provided on the side cover, one axial end of the rotary valve is hinged in the third mounting through hole, and the other axial end of the rotary valve is hinged in the second mounting through hole; the rotary limiting structure comprises a rotary wheel and a limiting pin, the rotary wheel is fixedly connected to one axial end of the rotary valve, a rotary notch is provided on the rotary wheel, the limiting pin is provided on the side cover, and one circumferential end or the other end of the rotary notch can abut against the limiting pin; The first end of the lifting short circuit is detachably connected to the cement head body; the lifting short circuit is provided with a transition cavity inwardly from the first end, a partition is provided in the transition cavity, a guide hole is provided on the partition, and the guide hole can connect the main flow channel and the secondary flow channel from the top.

2. The circulating manifold built-in rotary cement head according to claim 1, characterized in that: The central axis of the rotary valve is arranged perpendicularly to the central axis of the cement head body, and the axial ends of the rotary valve are respectively hinged on the side walls of the cement head body.

3. The circulating manifold built-in rotary cement head according to claim 1, characterized in that: One end of the rotating wheel away from the rotary valve extends out of the third mounting through hole, and a handwheel interface is arranged at one end of the rotating wheel away from the rotary valve.

4. The circulating manifold built-in rotary cement head according to claim 1, characterized in that: A first bearing is arranged between one axial end of the rotary valve and the third mounting through hole, and a second bearing is arranged between the other axial end of the rotary valve and the second mounting through hole.

5. The circulating manifold built-in rotary cement head according to claim 1, characterized in that: The circumferential angle of the rotating notch is 90°.

6. The circulating manifold built-in rotary cement head according to claim 1, characterized in that: The top of the lower outer cylinder is sleeved in the cement head body, a third bearing is arranged between the lower outer cylinder and the cement head body, the bottom end of the cement head body is detachably connected to a bottom cover, the bottom cover axially fixes the third bearing, and the lower outer cylinder rotates through the bottom cover.

Images