Well cementation cement head rubber plug indication short section

Abstract

The invention belongs to the technical field of oil field drilling, and discloses a well cementation cement head rubber plug indication short section which comprises a short section body, two linkage shafts, an inner indication piece and an outer indication piece. A well cementation channel and a containing cavity communicated with the well cementation channel are formed in the short section body, a first mounting hole and a second mounting hole which are communicated with the containing cavity and the outside are further formed in the short section body, and the first mounting hole and the second mounting hole are coaxial in the same diameter; one linkage shaft penetrates through the first mounting hole and the accommodating cavity, the other linkage shaft penetrates through the second mounting hole and the accommodating cavity, and the two linkage shafts extend in the first direction; the inner indicating piece comprises an inner indicating rod, the inner indicating rod extends in the radial direction of the well cementation channel, one end of the inner indicating rod extends into the containing cavity and is connected to the two linkage shafts, and the inner indicating rod can rotate in the first direction; the outer indicating piece comprises an outer indicating rod, and the outer indicating rod is connected to the end, located outside the pup joint body, of the linkage shaft. The well cementation cement head rubber plug indication short section is safe and reliable and can stably provide well cementation rubber plug release signals.

Description

Technical Field

[0001] The invention relates to the technical field of oil field drilling, in particular to a cementing head rubber plug indicating nipple. Background Art

[0002] Cementing is an important and indispensable part of the drilling and completion process. It refers to the process of inserting casing into the well and injecting cement into the annular space between the wellbore and the casing. Before and after cementing, cementing plugs need to be inserted to separate the injected cement from other environments. A cementing plug indicator device is provided on the cement head. When the cementing plug passes downward inside the cement head, it can clearly indicate outside the cement head, allowing the staff to judge the release status of the cementing plug and avoid accidents such as cementing emptying.

[0003] The existing cement head includes a connected cement head body and a cubic block, the cubic block is provided with a receiving cavity, connected to the cementing channel of the cement head body, the cubic block is provided with a first through hole with a large diameter and a second through hole with a small diameter, and the first through hole and the second through hole are both connected to the receiving cavity, the transverse axis is passed through the first through hole and the second through hole, and the axial direction of the transverse axis is perpendicular to the axial direction of the cementing channel, the inner indicator rod is located in the receiving cavity and vertically connected to the transverse axis, one end of the inner indicator rod can extend into the cementing channel, the outer indicator rod is connected to one end of the transverse axis extending out of the first through hole, and the bearing sleeve is provided at one end of the transverse axis extending out of the second through hole. During the downward movement of the cementing plug in the cementing channel, it will press against one end of the inner indicator rod, thereby driving the transverse rod and the outer indicator rod to rotate, providing instructions for the staff. Among them, a plurality of sealing rings are sleeved on the cross bar for sealing the gap between it and the first through hole wall and the second through hole wall. The diameter of the first through hole is larger than that of the second through hole, so that when the cross bar with the sealing rings is passed through the first through hole side, the sealing rings corresponding to the second through hole wall will not be interfered by the first through hole wall, which is convenient for installation.

[0004] However, due to the different diameters of the first through hole and the second through hole, there is a pressure difference in the two through holes due to the pressure in the cementing channel, which can easily cause the outer indicator rod or the bearing to be affected by the pressure difference and detach from the cross bar, affecting normal use. Summary of the invention

[0005] The object of the present invention is to provide a cementing head rubber plug indicating nipple, which can solve the above-mentioned pressure difference problem and provide a reliable indication of the release state of the cementing rubber plug.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The cementing head rubber plug indicating nipple is sandwiched between the cementing head and the casing, and includes:

[0008] A short section body, wherein the short section body is provided with a cementing passage and a receiving cavity connected to the cementing passage, and the short section body is further provided with a first mounting hole and a second mounting hole connected to the receiving cavity and the outside, and the first mounting hole and the second mounting hole are of equal diameter and coaxial;

[0009] Two linkage shafts, one linkage shaft is provided through the first mounting hole and the accommodating cavity, and the other linkage shaft is provided through the second mounting hole and the accommodating cavity, and both linkage shafts extend along a first direction, and the first direction is perpendicular to the axial direction of the cementing passage;

[0010] An inner indicator, the inner indicator comprising an inner indicator rod, the inner indicator rod extending in the radial direction of the cementing passage, one end of the inner indicator rod extending into the accommodating cavity and connected to the two linkage shafts, the inner indicator rod being able to rotate around the first direction;

[0011] The external indicator comprises an external indicator rod, the external indicator rod is connected to one end of the linkage shaft located outside the short section body, and the axial direction of the external indicator rod is perpendicular to the first direction.

[0012] Optionally, it also includes a first sealing ring and a second sealing ring, which are respectively sleeved on the outside of the two linkage shafts, the first sealing ring is used to seal the gap between one linkage shaft and the first mounting hole, and the second sealing ring is used to seal the gap between the other linkage shaft and the second mounting hole.

[0013] Optionally, the internal indicator also includes a first connecting portion connected to the internal indicator rod, the first connecting portion is arranged in the accommodating cavity, the internal indicator rod is connected to the linkage shaft through the first connecting portion, a first threaded hole is arranged on the first connecting portion, both of the two linkage shafts are provided with a first external thread, and both of the two linkage shafts are threadedly connected to the first threaded hole.

[0014] Optionally, the first connecting portion is cylindrical.

[0015] Optionally, the external indicator also includes a second connecting portion connected to the external indicator rod, the external indicator rod is connected to the linkage shaft via the second connecting portion, a second threaded hole is provided on the second connecting portion, the linkage shaft is provided with a second external thread, and the second connecting portion is threadedly connected to the linkage shaft.

[0016] Optionally, two external indicators are provided, and the two external indicators are respectively connected to one end of two linkage shafts located outside the short section body.

[0017] Optionally, a connecting cap is further included, which is connected to the end of the linkage shaft and is located on a side of the second connecting portion away from the short section body.

[0018] Optionally, the axial direction of the inner indicating rod, the axial direction of the outer indicating rod and the first direction are perpendicular to each other.

[0019] Optionally, a blocking piece is further included, and an opening communicating with the accommodating cavity is also provided on the short section body, and the blocking piece blocks the opening of the accommodating cavity.

[0020] Optionally, a first notch and a second notch are provided on the side wall of the short section body, the first mounting hole is connected to the first notch, the second mounting hole is connected to the second notch, and the ends of the two linkage shafts are respectively accommodated in the first notch and the second notch.

[0021] Beneficial effects of the present invention:

[0022] The cementing head rubber plug indicator nipple provided by the present invention comprises a nipple body, two linkage shafts, an inner indicator and an outer indicator. During the downward movement of the cementing plug in the nipple body, the cementing plug will press against the inner indicator rod, causing the inner indicator rod to rotate around the first direction, driving the linkage shaft and the outer indicator rod to rotate synchronously, so that the staff can judge the release state of the cementing plug by observing the rotation of the outer indicator rod. During the processing and assembly process of the cementing head rubber plug indicator nipple, the two linkage shafts are respectively inserted from the first mounting hole side and the second mounting hole side, and are connected to the inner indicator rod together. Since the first mounting hole and the second mounting hole are of equal diameter and coaxial, there is no pressure difference between the two holes, which prevents the outer indicator rod from being separated from the linkage shaft due to pressure. The entire cementing head rubber plug indicator nipple is safe and reliable, and can stably provide cementing plug release signals to the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a first cross-sectional view of a cement head rubber plug indicating nipple provided by an embodiment of the present invention;

[0024] Figure 2 is a second cross-sectional view of a cement head rubber plug indicating nipple provided by an embodiment of the present invention;

[0025] Figure 3 It is a partial schematic diagram of a cementing head rubber plug indicating nipple provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of a linkage shaft provided in an embodiment of the present invention.

[0027] In the figure:

[0028] 1. Pup joint body; 11. Cementing channel; 12. Accommodating chamber; 13. First notch; 14. Second notch; 2. Linkage shaft; 3. Inner indicator; 31. Inner indicator rod; 32. First connecting part; 4. Outer indicator; 41. Outer indicator rod; 42. Second connecting part; 51. First sealing ring; 52. Second sealing ring; 53. Third sealing ring; 6. Blocking part. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] This embodiment provides a cementing head rubber plug indicator short section, which is sandwiched between the cementing head and the casing and is used in the cementing process during oil drilling. The cementing head is the main hub of the wellhead of the ground manifold for cementing operations. Figure 1-Figure 3 As shown, the cementing head rubber plug indicator nipple provided in this embodiment includes a nipple body 1, two linkage shafts 2, an inner indicator 3 and an outer indicator 4. The nipple body 1 is provided with a cementing channel 11 and a receiving chamber 12 connected to the cementing channel 11, and the nipple body 1 is also provided with a first mounting hole and a second mounting hole connected to the receiving chamber 12 and the outside, and the first mounting hole and the second mounting hole are equal in diameter and coaxial. One linkage shaft 2 is passed through the first mounting hole and the receiving chamber 12, and the other linkage shaft 2 is passed through the second mounting hole and the receiving chamber 12, and both linkage shafts 2 extend in a first direction, and the first direction is perpendicular to the axial direction of the cementing channel 11. The inner indicator 3 includes an inner indicator rod 31, which extends in the radial direction of the cementing channel 11, and one end of which extends into the receiving chamber 12 and is connected to the two linkage shafts 2, and the inner indicator rod 31 can rotate around the first direction. The external indicator member 4 includes an external indicator rod 41 . The external indicator rod 41 is connected to one end of the linkage shaft 2 located outside the short section body 1 , and the axial direction of the external indicator rod 41 is perpendicular to the first direction.

[0035] During the downward movement of the cementing plug in the short section body 1, it will press against the inner indicator rod 31, causing the inner indicator rod 31 to rotate around the first direction, driving the linkage shaft 2 and the outer indicator rod 41 to rotate synchronously. Therefore, the staff can judge the release state of the cementing plug by observing the rotation of the outer indicator rod 41. During the processing and assembly process of the cementing head plug indicator short section, the two linkage shafts 2 are respectively inserted from the first mounting hole side and the second mounting hole side, and are connected to the inner indicator rod 31. Since the first mounting hole and the second mounting hole are of equal diameter and coaxial, there is no pressure difference between the two holes, which prevents the outer indicator rod 41 from being separated from the linkage shaft 2 due to pressure. The entire cementing head plug indicator short section is safe and reliable, and can stably provide the staff with cementing plug release signals. In this embodiment, the short section body 1 is milled in one piece by a machining center. Compared with the process of welding a cubic block to a cylindrical body in the prior art, the overall structure has high strength and is resistant to high pressure.

[0036] The inner indicating rod 31, the linkage shaft 2 and the outer indicating rod 41 are all made of high-strength alloy bars through a forging process, and have high strength and long service life.

[0037] Furthermore, the cementing head rubber plug indicating nipple also includes a first sealing ring 51 and a second sealing ring 52, which are respectively sleeved outside the two linkage shafts 2, the first sealing ring 51 is used to seal the gap between one linkage shaft 2 and the first mounting hole, and the second sealing ring 52 is used to seal the gap between the other linkage shaft 2 and the second mounting hole. Figure 4As shown, the linkage shaft 2 is circumferentially provided with a plurality of grooves, and the first sealing ring 51 or the second sealing ring 52 is arranged in the groove, and is not easily displaced. In this embodiment, the first sealing ring 51 and the second sealing ring 52 are both made of rubber material, which has high elasticity and good sealing effect.

[0038] Furthermore, the inner indicator member 3 also includes a first connecting portion 32 connected to the inner indicator rod 31, the first connecting portion 32 is arranged in the accommodating cavity 12, the inner indicator rod 31 is connected to the linkage shaft 2 through the first connecting portion 32, a first threaded hole is provided on the first connecting portion 32, the two linkage shafts 2 are both provided with a first external thread, and the two linkage shafts 2 are both threadedly connected to the first threaded hole, thereby realizing a fixed connection between the inner indicator rod 31 and the two linkage shafts 2, and the linkage shaft 2 can rotate synchronously when the inner indicator rod 31 rotates.

[0039] Furthermore, if Figure 1 As shown, the first connecting portion 32 is cylindrical to avoid interfering with the rotation of the inner indicating rod 31 and the linkage shaft 2.

[0040] Furthermore, if Figure 3 As shown, the outer indicator member 4 also includes a second connection portion 42 connected to the outer indicator rod 41, the outer indicator rod 41 is connected to the linkage shaft 2 through the second connection portion 42, a second threaded hole is provided on the second connection portion 42, the linkage shaft 2 is provided with a second external thread, and the second connection portion 42 is threadedly connected to the linkage shaft 2, thereby achieving a fixed connection between the outer indicator rod 41 and the linkage shaft 2, and the outer indicator rod 41 can rotate synchronously when the linkage shaft 2 rotates. In this embodiment, the second connection portion 42 is cylindrical.

[0041] Furthermore, two external indicator members 4 are provided, and the two external indicator members 4 are respectively connected to one end of the two linkage shafts 2 located outside the short section body 1, so that the staff can observe the rotation of the external indicator rod 41 from multiple angles and judge the release state of the cementing plug.

[0042] Furthermore, the cementing head rubber plug indicating nipple also includes a connecting cap, which is connected to the end of the linkage shaft 2 and is located on the side of the second connecting portion 42 away from the nipple body 1, so as to prevent the external indicator 4 from being separated from the linkage shaft 2. In this embodiment, the connecting cap presses the second connecting portion 42 against the outer wall of the nipple body 1 to prevent the linkage shaft 2 from shaking in the first mounting hole or the second mounting hole, thereby affecting the use effect. Exemplarily, the connecting cap is a nut, which is threadedly connected to the linkage shaft 2.

[0043] Furthermore, the axial direction of the inner indicating rod 31 and the axial direction of the outer indicating rod 41 are perpendicular to the first direction, so that the rotation of the three is smoother.

[0044] Furthermore, if Figure 1 and Figure 2As shown, the cementing head rubber plug indicating nipple also includes a plugging member 6, and an opening connected to the accommodating chamber 12 is also provided on the nipple body 1, and the plugging member 6 is plugged at the opening of the accommodating chamber 12. The opening connected to the accommodating chamber 12 makes the accommodating chamber 12 easy to process and easy to assemble the internal indicator 3. After the assembly is completed, the plugging member 6 is used to plug the accommodating chamber 12 to prevent cement from flowing out of the opening when pouring cement. In this embodiment, the plugging member 6 includes a thread plug.

[0045] Furthermore, the cementing head rubber plug indicating nipple further includes a third sealing ring 53, which is sleeved outside the plugging member 6 and is used to seal the gap between the plugging member 6 and the inner wall of the accommodating chamber 12. Exemplarily, the third sealing ring 53 is made of rubber material and has a good sealing effect.

[0046] Furthermore, if Figure 2 As shown, a first notch 13 and a second notch 14 are provided on the side wall of the short section body 1, the first mounting hole is connected to the first notch 13, the second mounting hole is connected to the second notch 14, and the ends of the two linkage shafts 2 are respectively accommodated in the first notch 13 and the second notch 14, thereby saving the space occupied by the cementing head plug indicating short section.

[0047] The assembly process of the cementing head rubber plug indicator sub provided in this embodiment is roughly as follows:

[0048] The first step is to place the inner indicator 3 into the accommodating cavity 12 from the opening, and make the inner indicator rod 31 extend along the radial direction of the cementing channel 11;

[0049] The second step is to sleeve the first sealing ring 51 and the second sealing ring 52 into the grooves of the two linkage shafts 2 respectively;

[0050] The third step is to insert the two linkage shafts 2 from the first mounting hole side and the second mounting hole side respectively, and threadedly connect them to the first threaded hole of the first connecting part 32;

[0051] Step 4: thread the two external indicator members 4 to one end of the two transmission shafts 2 located in the first notch 13 and the second notch 14, respectively, and connect the two connection caps to the ends of the two transmission shafts 2, respectively;

[0052] In the fifth step, the third sealing ring 53 is sleeved on the outside of the blocking member 6 , and the blocking member 6 is sealed at the opening of the accommodating cavity 12 .

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The cementing head rubber plug indicating nipple is sandwiched between the cementing head and the casing, and is characterized by: include: A short section body (1), wherein the short section body (1) is provided with a cementing passage (11) and a receiving cavity (12) connected to the cementing passage (11), and the short section body (1) is further provided with a first mounting hole and a second mounting hole connected to the receiving cavity (12) and the outside, and the first mounting hole and the second mounting hole are of equal diameter and coaxial; Two linkage shafts (2), one linkage shaft (2) is arranged through the first mounting hole and the accommodating cavity (12), and the other linkage shaft (2) is arranged through the second mounting hole and the accommodating cavity (12), and both linkage shafts (2) extend along a first direction, and the first direction is perpendicular to the axial direction of the cementing channel (11); An inner indicator (3), the inner indicator (3) comprising an inner indicator rod (31), the inner indicator rod (31) extending in the radial direction of the cementing passage (11), one end of the inner indicator rod (31) extending into the accommodating cavity (12) and connected to the two linkage shafts (2), the inner indicator rod (31) being capable of rotating about the first direction; An external indicator (4), the external indicator (4) comprising an external indicator rod (41), the external indicator rod (41) being connected to one end of the linkage shaft (2) located outside the short section body (1), and the axial direction of the external indicator rod (41) being perpendicular to the first direction.

2. The cementing head rubber plug indicating nipple according to claim 1, characterized in that: It also comprises a first sealing ring (51) and a second sealing ring (52), wherein the first sealing ring (51) and the second sealing ring (52) are respectively sleeved outside the two linkage shafts (2), the first sealing ring (51) being used to seal the gap between one linkage shaft (2) and the first mounting hole, and the second sealing ring (52) being used to seal the gap between the other linkage shaft (2) and the second mounting hole.

3. The cementing head rubber plug indicating nipple according to claim 1, characterized in that: The inner indicator member (3) further comprises a first connection portion (32) connected to the inner indicator rod (31); the first connection portion (32) is arranged in the accommodating cavity (12); the inner indicator rod (31) is connected to the linkage shaft (2) via the first connection portion (32); a first threaded hole is arranged on the first connection portion (32); both linkage shafts (2) are provided with a first external thread; and both linkage shafts (2) are threadedly connected to the first threaded hole.

4. The cementing head rubber plug indicating nipple according to claim 3, characterized in that: The first connecting portion (32) is cylindrical.

5. The cementing head rubber plug indicating nipple according to claim 1, characterized in that: The external indicator member (4) further comprises a second connecting portion (42) connected to the external indicator rod (41); the external indicator rod (41) is connected to the linkage shaft (2) via the second connecting portion (42); a second threaded hole is provided on the second connecting portion (42); the linkage shaft (2) is provided with a second external thread; and the second connecting portion (42) is threadedly connected to the linkage shaft (2).

6. The cementing head rubber plug indicating nipple according to claim 5, characterized in that: Two external indicator members (4) are provided, and the two external indicator members (4) are respectively connected to one end of the two linkage shafts (2) located outside the short section body (1).

7. The cementing head rubber plug indicating nipple according to claim 5, characterized in that: It also comprises a connecting cap, which is connected to the end of the linkage shaft (2) and is located on the side of the second connecting portion (42) away from the short section body (1).

8. The cementing head rubber plug indicating nipple according to any one of claims 1 to 7, characterized in that: The axial direction of the inner indicating rod (31), the axial direction of the outer indicating rod (41), and the first direction are perpendicular to each other.

9. The cementing head rubber plug indicating nipple according to any one of claims 1 to 7, characterized in that: It also comprises a blocking piece (6), and the short section body (1) is also provided with an opening connected to the accommodating cavity (12), and the blocking piece (6) blocks the opening of the accommodating cavity (12).

10. The cementing head rubber plug indicating nipple according to any one of claims 1 to 7, characterized in that: A first notch (13) and a second notch (14) are provided on the side wall of the short section body (1); the first mounting hole is connected to the first notch (13); the second mounting hole is connected to the second notch (14); and the ends of the two linkage shafts (2) are respectively accommodated in the first notch (13) and the second notch (14).

Images