A cover plate type non-circulation horizontal well male head housing

Abstract

The present invention relates to the technical field of horizontal well male heads, and specifically to a cover-plate type non-circulation horizontal well male head shell. A cover-plate type non-circulation horizontal well male head shell comprises a male head shell and a male head port, the male head port is through-connected to the right end of the male head shell, and a centralizer is integrally provided on the outer peripheral surface of the male head shell. The beneficial effect of the present invention is that by providing a sewage cover plate and a torsion spring, the sewage cover plate of the sewage outlet is usually sealed, and it covers the sewage cover plate on the sewage outlet through the contraction force of the torsion spring. When the well logging and coring are docked, the downward pressure generated is much greater than the contraction force of the sewage cover plate, and the sewage cover plate corresponding to the sewage outlet is opened, and debris and dirt are discharged into the drill pipe. When the docking is completed, the impact force disappears, and the sewage cover plate covers the sewage outlet again under the tension of the torsion spring, which effectively prevents the dirt in the drill pipe from entering the tool cavity again after the docking is completed to cause secondary pollution.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal well male connectors, and in particular to a cover plate type circulation-free horizontal well male connector housing. Background Art

[0002] A horizontal well is a well with an inclination angle of 90° or close to 90° and a wellbore drilled horizontally for a certain length. Generally speaking, horizontal wells are suitable for thin oil and gas layers or fractured oil and gas reservoirs, with the purpose of increasing the exposed area of ​​the oil and gas layers. Since the 1980s, with the development of advanced measuring instruments, long-life motors and new PDC drill bits, horizontal well drilling has developed on a large scale and at a high speed.

[0003] At present, in the well logging and drilling coring construction of horizontal well projects, in order to prevent the dirt in the water eye from entering the tool docking point, the current practice is to cover the drain port on the male assembly shell with a thinner metal sealing filter device to prevent the debris and dirt in the drill pipe from entering the docking system for the second time and affecting the connection between the male and female heads.

[0004] However, in actual construction, large particles of debris mixed in the mud can easily break the filter when discharged. The damaged filter can not play a subsequent protective role at all, but will produce new pollution, and its practicality is low. In addition, during the on-site construction process, in order to remove the debris in the docking tool, the drill pressurized circulation sewage discharge method is generally adopted. However, the application of this method in ultra-deep wells is limited because the pressure in the well is too high at this time, and the weak parts in the downhole instrument string are prone to accidental bursting during pressurization, which has low safety. Summary of the invention

[0005] The present invention aims at the technical problems existing in the prior art and provides a cover plate type circulation-free horizontal well male head shell to solve the problem that in the actual construction of the existing horizontal well male head, large particles of debris mixed in the mud are easy to break the filter screen when discharged, and the damaged filter screen can not play a subsequent protective role at all, on the contrary, it will produce new pollution, and the practicality is low. In addition, during the on-site construction process, in order to remove the debris and sundries in the docking tool, the method of pressurized circulation of drilling tools is generally adopted, but this method is limited in application in ultra-deep wells. The reason is that the pressure in the well is too high at this time, and the weak parts in the downhole instrument string are prone to accidental explosion accidents during pressurization, resulting in low safety.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a cover-type circulation-free horizontal well male head shell, comprising a male head shell and a male head port, the male head port is through-connected to the right end of the male head shell, the outer peripheral surface of the male head shell is integrally provided with a stabilizer, and the surface of the male head shell is provided with a sewage outlet, a protective block is fixedly provided at the right position of the sewage outlet, and a limiting block is integrally connected to the left position of the sewage outlet, the right end of the limiting block is movably connected with a sewage cover plate, a rotating shaft is fixedly inserted at the left positions of both ends of the sewage cover plate, a torsion spring is fixedly sleeved on the surface of the rotating shaft, a longitudinal sewage groove is provided on the surface of the sewage cover plate, a transverse plug hole is through-provided on the inner wall of the longitudinal sewage groove, and a transverse insertion strip is movably inserted inside the transverse plug hole.

[0007] The beneficial effects of the present invention are:

[0008] The cover-type circulation-free horizontal well male head shell has a better effect. In subsequent construction operations, if there are still debris and dirt in the tool, the traditional method is to pressurize and circulate the drilling mud. The horizontal well male head shell does not need to be pressurized to remove the dirt in the tool. It only needs to lift the drill pipe to a certain height. The liquid column in the tool is higher than the liquid level in the drill pipe. The pressure difference caused causes the dirt to be pressed out of the tool by the liquid column, and the debris in the tool can be removed, realizing efficient pressurized circulation and drainage, and realizing logging and coring operations in ultra-deep wells and complex wells. It is safer, more economical and more efficient to use.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the sewage outlet is located between the two groups of centralizers, and four sewage outlets are provided, and the sewage outlet cover plate is rotated on the inner side of the two groups of centralizers through a rotating shaft.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that the present invention is provided with a sewage outlet and a sewage cover. Normally, the sewage cover of the sewage outlet is sealed, and it covers the sewage cover on the sewage outlet through the contraction force of the torsion spring. When the well logging and coring are connected, the downward pressure generated is much greater than the contraction force of the sewage cover. The sewage cover corresponding to the sewage outlet opens, and debris and dirt are discharged into the drill pipe, thereby realizing automatic discharge of dirt.

[0012] Furthermore, grooves matching with the torsion spring are formed on both side walls of the centralizer, the torsion spring is fixedly sleeved on the surface of the rotating shaft, and both ends of the torsion spring are fixedly connected to the grooves in the centralizer.

[0013] The beneficial effect of adopting the above further scheme is that, by arranging a torsion spring, the impact force disappears after the docking is completed, and the sewage cover plate covers the sewage outlet again under the tension of the torsion spring, thereby effectively preventing the dirt in the drill rod from entering the tool cavity again after the docking is completed and causing secondary contamination.

[0014] Furthermore, four or more longitudinal drainage grooves are provided, and the four or more longitudinal drainage grooves are evenly distributed on the drainage cover plate.

[0015] The beneficial effect of adopting the above further scheme is that the present invention is provided with a longitudinal drain groove, and the longitudinal drain groove on the drain cover can drain sewage when the drain cover is closed. In addition, the longitudinal drain groove can ensure the internal and external pressure balance after the drain cover is closed, which has higher practicality.

[0016] Furthermore, the transverse insertion holes are provided with five or more, the transverse insertion bars are movably connected with the transverse insertion holes, and the transverse insertion bars are vertically crossed with the longitudinal sewage troughs.

[0017] The beneficial effect of adopting the above further scheme is that the present invention is provided with transverse insertion holes and transverse insertion strips. The purpose of inserting the transverse insertion strips into the transverse insertion holes is to prevent dirt from entering the docking joints during subsequent construction and causing secondary pollution. The number of transverse insertion strips installed can be adjusted according to the mud conditions in the well, the size of the debris particles and the dirt, and has strong flexibility.

[0018] Furthermore, the limit stopper is arranged at the left end position between the two groups of centralizers, and the limit stopper is arranged at a height lower than the centralizer and higher than the sewage cover plate.

[0019] The beneficial effect of adopting the above further scheme is that, by providing a limit stopper, the sewage cover is not infinitely flipped over, but is blocked by the limit stopper at the rotating shaft, so that the outer edge of the sewage cover is not exposed from the male head shell.

[0020] Furthermore, the protective stopper is arranged at the right end position between the two groups of centralizers, and the left side wall of the protective stopper is provided with a groove which matches the right side wall of the sewage cover plate.

[0021] The beneficial effect of adopting the above further scheme is that the present invention is provided with a protective block. After the sewage is discharged, the torsion spring pulls the sewage discharge cover to close. After the sewage discharge cover is closed, the outer edge is blocked by the protective block to prevent damage during lifting and lowering, thereby further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the sewage cover structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the disassembled structure of the sewage cover plate of the present invention;

[0025] Figure 4 It is a schematic diagram of the top view of the sewage discharge cover plate of the present invention.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Male housing; 2. Male port; 3. Centralizer; 4. Drain port; 5. Protective block; 6. Limit block; 7. Drain cover; 8. Rotating shaft; 9. Torsion spring; 10. Longitudinal drain groove; 11. Horizontal plug hole; 12. Horizontal insert strip. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0029] At present, in the well logging and drilling coring construction of horizontal well engineering, in order to prevent the dirt in the water eye from entering the tool docking, the current practice is to cover a thinner metal filter device outside the sewage outlet on the male head assembly shell to prevent the debris and dirt in the drill pipe from entering the docking system for the second time and affecting the connection between the male and female heads. However, in actual construction, the large particles of debris mixed in the mud are easy to break the filter screen when discharged. The damaged filter screen does not play a subsequent protective role at all, but will produce new pollution, and the practicality is low. In addition, in the on-site construction process, in order to remove the debris in the docking tool, the drill pressurized circulation sewage discharge method is generally adopted, but this method is limited in application in ultra-deep wells because the pressure in the well is too high at this time, and the weak parts in the downhole instrument string are easy to burst accidentally when pressurized, and the safety is low. In this regard, the present invention provides a cover plate type non-circulation horizontal well male head shell to solve the above technical problems.

[0030] The present invention is designed in the following two aspects: first, the protective cover designed during the docking process automatically opens under the action of the impact force, allowing the drilling filtrate and mixed dirt to flow out from the drainage hole; after the docking is completed, the cover is retracted to cover the drainage hole to prevent the debris in the drilling tool from entering the instrument cavity for the second time. Second, in ultra-deep wells, under the condition that the application of drilling pressure circulation is greatly restricted, the invention can avoid drilling pressure circulation and realize logging and coring operations in ultra-deep wells and complex wells.

[0031] The present invention provides the following preferred embodiments

[0032] like Figure 1 and Figure 2As shown, a cover-plate type circulation-free horizontal well male shell comprises a male shell 1 and a male port 2, the male port 2 is through-connected to the right end of the male shell 1, a centralizer 3 is integrally provided on the outer peripheral surface of the male shell 1, and a sewage outlet 4 is provided on the surface of the male shell 1, a protective stopper 5 is fixedly provided at the right side of the sewage outlet 4, and a limiting stopper 6 is integrally connected to the left side of the sewage outlet 4, a sewage cover plate 7 is movably connected to the right end of the limiting stopper 6, a rotating shaft 8 is fixedly inserted at the left positions of both ends of the sewage cover plate 7, a torsion spring 9 is fixedly sleeved on the surface of the rotating shaft 8, a longitudinal sewage groove 10 is provided on the surface of the sewage cover plate 7, a transverse plug hole 11 is through-provided on the inner wall of the longitudinal sewage groove 10, and a transverse insertion strip 12 is movably inserted inside the transverse plug hole 11.

[0033] In this embodiment, Figure 1 and Figure 2 As shown, the sewage outlet 4 is located between the two groups of centralizers 5, and there are four sewage outlets 4. The sewage cover plate 7 is rotated on the inner side of the two groups of centralizers 5 through the rotating shaft 8. The sewage cover plate 7 of the sewage outlet 4 is usually sealed. It covers the sewage cover plate 7 on the sewage outlet 4 through the contraction force of the torsion spring 9. When the logging coring is docked, the downward pressure generated is much greater than the contraction force of the sewage cover plate 7. The sewage cover plate 7 corresponding to the sewage outlet 4 is opened, and the debris and dirt are discharged into the drill pipe, realizing the automatic discharge of dirt.

[0034] In this embodiment, Figure 1 and Figure 4 As shown, grooves matching with the torsion spring 9 are provided on the two side walls of the centralizer 5. The torsion spring 9 is fixedly sleeved on the surface of the rotating shaft 8, and both ends of the torsion spring 9 are fixedly connected with the grooves in the centralizer 3. When the docking is completed, the impact force disappears, and the sewage cover plate 7 covers the sewage outlet 4 again under the pulling force of the torsion spring 9, which effectively prevents the dirt in the drill pipe from entering the tool cavity again after the docking is completed to cause secondary pollution.

[0035] In this embodiment, Figure 1 and Figure 4 As shown, four or more longitudinal drain grooves 10 are provided, and the four or more longitudinal drain grooves 10 are evenly distributed on the drain cover 7. The longitudinal drain grooves 10 on the drain cover 7 can discharge sewage when the drain cover 7 is closed. In addition, the longitudinal drain grooves 10 can ensure the internal and external pressure balance after the drain cover 7 is closed, and have higher practicality.

[0036] In this embodiment, Figure 2 and Figure 3As shown, five or more transverse holes 11 are provided, and the transverse inserts 12 are movably connected with the transverse holes 11, and the transverse inserts 12 are vertically crossed with the longitudinal sewage trough 10. The purpose of inserting the transverse inserts 12 in the transverse holes 11 is to prevent the dirt in the subsequent construction from entering the docking position and causing secondary pollution. The number of transverse inserts 12 installed can be adjusted according to the mud conditions in the well, the size of the debris particles and the dirt, and has strong flexibility.

[0037] In this embodiment, Figure 1 and Figure 2 As shown, the limit stopper 6 is arranged at the left end position between the two groups of centralizers 3, and the height of the limit stopper 6 is lower than the centralizer 3 and higher than the sewage cover 7. The sewage cover 7 is not infinitely flipped over. It is blocked by the limit stopper 6 at the rotating shaft 8, so that the outer edge of the sewage cover 7 does not expose the male head shell 1.

[0038] In this embodiment, Figure 1 and Figure 2 As shown, the protective stopper 5 is arranged at the right end position between the two groups of straighteners 3, and the left side wall of the protective stopper 5 is provided with a groove which matches the right side wall of the sewage discharge cover plate 7. After the sewage discharge is completed, the torsion spring 9 pulls the sewage discharge cover plate 7 to close. After the sewage discharge cover plate 7 is closed, the outer edge is blocked by the protective stopper 5 to prevent damage during lifting and lowering, thereby further improving safety.

[0039] The specific working process of the present invention is as follows:

[0040] First, the male port 2 is downwardly connected for well logging and coring. Normally, the sewage cover 7 of the sewage outlet 4 is sealed. It covers the sewage cover 7 on the sewage outlet 4 through the contraction force of the torsion spring 9. During the well logging and coring connection, the downward pressure generated is much greater than the contraction force of the sewage cover 7. The sewage cover 7 corresponding to the sewage outlet 4 opens, and debris and dirt are discharged into the drill pipe to realize automatic discharge of dirt. The sewage cover 7 is not infinitely flipped over. It is blocked by the limit block 6 at the rotating shaft 8, so that the outer edge of the sewage cover 7 does not expose the male head shell 1.

[0041] Then, when the docking is completed, the impact force disappears, and the drainage cover plate 7 re-covers the drainage port 4 under the tension of the torsion spring 9, effectively preventing the dirt in the drill pipe from entering the tool cavity again after the docking is completed to cause secondary pollution.

[0042] Finally, after the sewage is discharged, the torsion spring 9 pulls the sewage discharge cover 7 to close. After the sewage discharge cover 7 is closed, the outer edge is blocked by the protective block 5 to prevent damage during lifting and lowering, thereby further improving safety. The longitudinal sewage discharge groove 10 on the sewage discharge cover 7 can discharge sewage when the sewage discharge cover 7 is closed.

[0043] In addition, the longitudinal drainage groove 10 can ensure the internal and external pressure balance after the drainage cover 7 is closed, and has higher practicality. The purpose of inserting the transverse insertion strip 12 into the transverse insertion hole 11 is to prevent dirt from entering the docking point during subsequent construction and causing secondary pollution. The number of installed transverse insertion strips 12 can be adjusted according to the mud conditions in the well, the size of the debris particles and the dirt, and has strong flexibility.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate type non-circulation horizontal well male housing, comprising a male housing (1) and a male port (2), characterized in that: The male port (2) is connected to the right end of the male shell (1); a centralizer (3) is integrally provided on the outer peripheral surface of the male shell (1); a sewage outlet (4) is provided on the surface of the male shell (1); a protective stopper (5) is fixedly provided at the right side of the sewage outlet (4); a limit stopper (6) is integrally connected to the left side of the sewage outlet (4); a sewage cover plate (7) is movably connected to the right end of the limit stopper (6); a rotating shaft (8) is fixedly inserted at the left sides of both ends of the sewage cover plate (7); a torsion spring (9) is fixedly sleeved on the surface of the rotating shaft (8); a longitudinal sewage groove (10) is provided on the surface of the sewage cover plate (7); a transverse insertion hole (11) is provided through the inner wall of the longitudinal sewage groove (10); a transverse insertion strip (12) is movably inserted inside the transverse insertion hole (11).

2. A cover plate type non-circulation horizontal well male housing according to claim 1, characterized in that: The sewage outlet (4) is located between the two groups of centralizers (3), and four sewage outlets (4) are provided. The sewage outlet cover plate (7) is rotated on the inner side of the two groups of centralizers (3) via a rotating shaft (8).

3. The cover plate type non-circulation horizontal well male head housing according to claim 1 is characterized in that: The two side walls of the centralizer (3) are provided with grooves matching the torsion spring (9), the torsion spring (9) is fixedly sleeved on the surface of the rotating shaft (8), and both ends of the torsion spring (9) are fixedly connected to the grooves in the centralizer (3).

4. The cover plate type non-circulation horizontal well male housing according to claim 1, characterized in that: More than four longitudinal drainage grooves (10) are provided, and the more than four longitudinal drainage grooves (10) are evenly distributed on the drainage cover plate (7).

5. The cover plate type non-circulation horizontal well male housing according to claim 1 is characterized in that: The transverse insertion holes (11) are provided with more than five, the transverse insertion strips (12) are movably connected to the transverse insertion holes (11), and the transverse insertion strips (12) are vertically cross-arranged with the longitudinal sewage troughs (10).

6. The cover plate type non-circulation horizontal well male housing according to claim 1, characterized in that: The limit stopper (6) is arranged at the left end position between the two sets of centralizers (3), and the limit stopper (6) is arranged at a height lower than the centralizer (3) and higher than the sewage discharge cover plate (7).

7. The cover plate type non-circulation horizontal well male connector housing according to claim 1 is characterized in that: The protective stopper (5) is arranged at the right end position between the two sets of centralizers (3), and a groove is formed on the left side wall of the protective stopper (5) and matches the right side wall of the sewage discharge cover plate (7).

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