Oil extraction wellhead optical cable sealing device

Abstract

The utility model discloses an oil extraction wellhead optical cable sealing device, which comprises a sealing body, a compensation base, a packing and a packing gland, and is characterized in that the sealing body is provided with a mounting through hole, and the mounting through hole is used for allowing an optical cable to pass through; a sealing hole is formed in the compensation base, the compensation base comprises a plurality of base parts, the optical cable is connected into the sealing hole after the plurality of base parts are buckled, and the compensation base is connected to the inner side of the mounting through hole; the packing is located at the upper end of the compensation base, and the packing is used for sealing a gap between the optical cable and the mounting through hole; a sealing through hole is formed in the packing gland, the packing gland comprises a plurality of gland parts, an optical cable is connected into the sealing through hole after the gland parts are buckled, and the bottom of the packing gland abuts against the top of the packing. The beneficial effects are that the optical cable does not need to be cut off during installation, the same optical cable can be used in oil wells with different depths, the utilization rate of the optical cable is improved, and the production operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of fiber optic logging technology, and particularly relates to an optical cable sealing device for an oil production wellhead. Background Technique

[0002] An armored optical cable is installed in the production casing of an oil well to obtain the acoustic wave and temperature responses of the oil well during production or injection. Since the depths of the tested oil wells are different, the lengths of the optical cables required for each oil well are different.

[0003] Currently, a sealing device is set at the wellhead to seal the optical cable. When the existing sealing device is installed, the sealing sleeve needs to be sleeved on the position of the optical cable at the wellhead. Therefore, it is necessary to cut off the optical cable at the wellhead before installing the sealing piece, so that the sealing piece can be sleeved on the optical cable from the cut-off position. This results in that the same optical cable cannot be used for oil wells of various depths, increasing the single-well operation cost and affecting the on-site construction progress. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is that the existing wellhead optical cable sealing device needs to cut off the optical cable during installation, and one optical cable can only be used for an oil well with a corresponding depth, resulting in a large amount of optical cable consumption. The purpose is to provide an optical cable sealing device for an oil production wellhead. The packing gland plate and the compensating base do not need to be inserted through the end of the optical cable to the position of the optical cable at the wellhead, and there is no need to cut off the optical cable when installing the sealing device, so that the same optical cable can be used in oil wells of various depths, improving the utilization rate of the optical cable.

[0005] The utility model is realized by the following technical solutions:

[0006] An optical cable sealing device for an oil production wellhead includes a sealing body, a compensating base, packing, and a packing gland. An installation through hole is provided on the sealing body for the optical cable to pass through; a sealing hole is provided on the compensating base. The compensating base includes several base components, and after the several base components are buckled, the optical cable is connected in the sealing hole. The compensating base is connected to the inner side of the installation through hole; the packing is located at the upper end of the compensating base for sealing the gap between the optical cable and the installation through hole; a sealing through hole is provided on the packing gland. The packing gland includes several gland components, and after the several gland components are buckled, the optical cable is connected in the sealing through hole. The bottom of the packing gland abuts against the top of the packing.

[0007] The beneficial effects of the present utility model are as follows. By setting the sealing body to be sealingly connected to the wellhead, and then setting a compensating base that can be buckled by several base components and a packing gland cover that can be buckled by several gland components, it is convenient for the packing gland cover and the compensating base to be arranged at the position of the optical cable at the wellhead without passing through the end of the optical cable. When installing the sealing device, the optical cable does not need to be cut, and the sealing structure can be quickly installed on the optical cable, enabling the same optical cable to be used in oil wells at various depths, improving the versatility of the optical cable and reducing the usage amount of the optical cable. An installation through-hole is provided on the sealing body, facilitating the outer peripheries of the packing gland cover and the compensating base to abut against the installation through-hole, enabling the compensating base and the packing gland cover to work in a state of being buckled into a whole. A packing is arranged between the packing gland cover and the compensating base, and the gap between the optical cable and the installation through-hole is sealed by the packing, thereby ensuring the sealing effect of the sealing device.

[0008] In some embodiments, the compensating base is integrally cylindrical, including a convex ring portion and a cylindrical portion. The convex ring portion is located at the top of the cylindrical portion, and the diameter of the convex ring portion is greater than the diameter of the cylindrical portion. This facilitates abutting against the packing through the convex ring portion to improve the sealing effect of the packing.

[0009] In some embodiments, the packing gland is connected to the top of the sealing body. This facilitates compacting the packing in the installation through-hole of the sealing body through the packing gland.

[0010] In some embodiments, the packing gland includes a disc portion and a tapered column. The disc portion is located at the top of the tapered column. The disc portion is connected to the top of the sealing body, and the bottom of the tapered column abuts against the top of the packing. This facilitates positioning the disc portion at the top of the sealing body, thereby ensuring that the tapered column can abut against the top of the packing to compact the packing and achieve the sealing effect.

[0011] In some embodiments, several positioning holes are provided on the disc portion, and several threaded holes corresponding to the positioning holes are provided on the top of the sealing body. The connecting bolts pass through the positioning holes and are screwed with the threaded holes. The packing gland is connected to the sealing body through the bolts, which is convenient for disassembly and maintenance.

[0012] In some embodiments, the sealing body is integrally cylindrical. The installation through-hole includes a first through-hole and a second through-hole. The diameter of the second through-hole is greater than the diameter of the first through-hole. The ring portion of the compensating base is located at the top of the side wall of the first through-hole. By making the diameter of the second through-hole greater than that of the first through-hole, it is convenient to snap the ring portion of the compensating base at the connection between the second through-hole and the first through-hole, preventing the compensating base from shifting when the packing gland cover compacts the packing and providing a supporting force for the packing.

[0013] In some embodiments, a taper thread is provided on the outer periphery of the sealing body, and the taper thread is used to connect with the internal thread on the wellhead, so that the outer periphery of the sealing body is hermetically connected to the wellhead, and the connection reliability between the optical cable sealing device for oil production wellhead and the wellhead is enhanced.

[0014] In some embodiments, the installation through hole further includes a tapered through hole located at the top of the second through hole. The bottom diameter of the tapered through hole is smaller than the diameter of the second through hole, and the tapered column of the packing gland is matched with the tapered through hole. By making the bottom diameter of the tapered through hole smaller than the diameter of the second through hole, the top of the packing is made smaller than the bottom, so that the force exerted on the packing by the tapered column is greater than the force exerted by a straight column with the same diameter as the second through hole (when the same acting force acts on an increased force-receiving area, the pressure will decrease; conversely, when the force-receiving area decreases, the pressure will increase), improving the compaction effect of the packing and ensuring the sealing effect of the device.

[0015] In some embodiments, several pipe wrench slots are provided on the outer side of the sealing body. The pipe wrench slots are located at the upper end of the taper thread, and the pipe wrench slots are used to be clamped with a pipe wrench installed on the wellhead. By providing several pipe wrench slots on the outer side of the sealing body, it is convenient to position the upper end of the sealing body on the pipe wrench.

[0016] In some embodiments, the packing is graphite packing. By utilizing the characteristics of graphite being corrosion-resistant and high-temperature-resistant, the service life of the packing is improved.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] 1. The compensation base buckled by at least two parts and the packing cover plate buckled by at least two parts facilitate the packing cover plate and the compensation base to be arranged at the position of the optical cable at the wellhead without passing through the end of the optical cable. When installing the sealing device, the optical cable does not need to be cut off, and the sealing structure can be quickly installed on the optical cable, enabling the same optical cable to be used in oil wells at various depths, improving the versatility of the optical cable and reducing the loss of the optical cable.

[0019] 2. An installation through hole is provided on the sealing body, facilitating the outer peripheries of the packing cover plate and the compensation base to be abutted against the installation through hole, enabling the compensation base and the packing cover plate to work in a state of being buckled into a whole, and a packing is arranged between the packing cover plate and the compensation base to seal the gap between the optical cable and the installation through hole, thereby ensuring the sealing effect of the sealing device.

[0020] 3. The bottom diameter of the conical through-hole is smaller than the diameter of the second through-hole, so that the top of the packing is smaller than the bottom, and the force exerted on the packing by the conical column is greater than the force exerted by a straight column with the same diameter as the second through-hole (when the same acting force acts on an increased force-receiving area, the pressure decreases; conversely, when the force-receiving area decreases, the pressure increases), improving the compaction effect on the packing and ensuring the sealing effect of the device. Description of the Drawings

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, form a part of this application, and do not limit the embodiments of the present utility model. In the drawings:

[0022] Figure 1 is a cross-sectional view of the present utility model;

[0023] Figure 2 is a three-dimensional structural schematic diagram of the present utility model;

[0024] Figure 3 is a cross-sectional structural schematic diagram of the sealing body in the present utility model;

[0025] Figure 4 is a three-dimensional structural schematic diagram of the compensation base in the present utility model;

[0026] Figure 5 is a three-dimensional structural schematic diagram of the compensator in the present utility model;

[0027] Figure 6 is a three-dimensional structural schematic diagram of the packing gland in the present utility model;

[0028] Figure 7 is a three-dimensional structural schematic diagram of the assembly in the present utility model.

[0029] Sealing body 100, sealing part 101, pipe wrench slot 1011, threaded hole 1012, second through-hole 1013, taper thread 1021, first through-hole 1022, compensation base 110, base component 111, convex ring part 112, cylindrical part 113, packing gland 120, gland component 121, positioning hole 1211, disc part 122, conical column 123, packing 130, connecting bolt 140, optical cable 200. Detailed Embodiments

[0030] To make the objectives, technical solutions, and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions of the present utility model are only used to explain the present utility model and do not limit the present utility model.

[0031] Throughout the specification, references to "an embodiment", "embodiments", "an example" or "examples" mean that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present utility model. Thus, the phrases "an embodiment", "embodiments", "an example" or "examples" that appear throughout the specification do not necessarily all refer to the same embodiment or example. Additionally, the specific features, structures, or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model.

[0033] The terms "first", "second", etc. used in the present utility model are only used to distinguish the corresponding components for the sake of clear description, and are not intended to limit any order or emphasize importance, etc. Additionally, the term "connected" used herein, without special explanation, can be directly connected or indirectly connected via other components.

[0034] Since, in the case of a relatively long optical cable 200 in the existing optical cable sealing device, it is still necessary to cut off the redundant optical cable 200, which is not convenient for quick penetration and sealing. If it penetrates over a long distance, it will also cause wear to the fiber core fixing and sealing structure of the existing optical cable sealing device, seriously affecting the sealing effect. Therefore, an oil production wellhead optical cable sealing device is provided, such as Figures 1-7As shown in the figure, it includes a sealing body 100, a compensation base 110, a packing 130 and a packing gland 120. An installation through-hole is provided on the sealing body 100 for the optical cable 200 to pass through, and the sealing body 100 is used for sealing connection to the wellhead; a sealing hole is provided on the compensation base 110, and the compensation base 110 includes several base components 111. After the several base components 111 are buckled, the optical cable 200 is connected in the sealing hole, and the compensation base 110 is connected to the inner side of the installation through-hole; the packing 130 is located at the upper end of the compensation base 110, and the packing 130 is used for sealing the gap between the optical cable 200 and the installation through-hole; a sealing through-hole is provided on the packing gland 120, and the packing gland 120 includes several gland components 121. After the several gland components 121 are buckled, the optical cable 200 is connected in the sealing through-hole, and the bottom of the packing gland 120 abuts against the top of the packing 130. By setting the sealing body 100 to be sealed and connected to the wellhead, and then setting the compensation base 110 that can be buckled by several base components 111 and the packing gland 130 cover that can be buckled by several gland components 121, it is convenient for the packing gland 130 cover and the compensation base 110 not to be inserted from the end of the optical cable 200 at the position of the optical cable 200 at the wellhead. When installing the sealing device, the optical cable 200 does not need to be cut, and the sealing structure can be quickly installed on the optical cable 200, so that the optical cable 200 can be used in oil wells at various depths, improving the versatility of the optical cable 200 and reducing the usage amount of the optical cable 200.

[0035] Specifically, referring to Figures 2 to 7 , the compensation base 110 is set to a two-part structure, and the two component structures are the same. The packing gland 120 is also set to a two-part structure, and the two component structures are the same. The dividing lines of the packing gland 120 and the compensation base 110 both pass through their centers respectively.

[0036] Referring to Figure 1 and Figure 3 , the compensation base 110 is integrally cylindrical, including a convex ring portion 112 and a cylindrical portion 113. The convex ring portion 112 is located at the top of the cylindrical portion 113, and the diameter of the convex ring portion 112 is larger than the diameter of the cylindrical portion 113. It is convenient to abut against the packing 130 through the convex ring portion 112 to improve the sealing effect of the packing 130.

[0037] Referring to Figure 1 and Figure 6 , the packing gland 120 is connected to the top of the sealing body 100. It is convenient to compact the packing 130 in the installation through-hole of the sealing body 100 through the packing gland 120.

[0038] Referring to Figure 6 and Figure 7, the packing gland 120 includes a disc portion 122 and a tapered column 123. The disc portion 122 is located at the top of the tapered column 123. The disc portion 122 is connected to the top of the sealing body 100. The bottom of the tapered column 123 abuts against the top of the packing 130. This facilitates positioning the disc portion 122 at the top of the sealing body 100, thereby ensuring that the tapered column 123 can abut against the top of the packing 130 to compact the packing 130 and achieve the sealing effect.

[0039] See Figure 1 and Figure 2 , several positioning holes 1211 are provided on the disc portion 122. Several threaded holes 1012 corresponding to the positioning holes 1211 are provided at the top of the sealing body 100. The connecting bolt 140 passes through the positioning holes 1211 and is screwed into the threaded holes 1012. Connecting the packing gland 120 to the sealing body 100 with bolts facilitates disassembly and repair.

[0040] See Figure 2 and Figure 4 , the sealing body 100 is generally cylindrical. The installation through-hole includes a first through-hole 1022 and a second through-hole 1013. The diameter of the second through-hole 1013 is larger than that of the first through-hole 1022. The annular portion of the compensation base 110 is located at the top of the side wall of the first through-hole 1022. By making the diameter of the second through-hole 1013 larger than that of the first through-hole 1022, it is convenient to snap the annular portion of the compensation base 110 at the connection between the second through-hole 1013 and the first through-hole 1022, preventing the compensation base 110 from shifting when the packing 130 cover compacts the packing 130 and providing a supporting force for the packing 130.

[0041] See Figure 1 and Figure 4 , a tapered thread 1021 is provided on the outer periphery of the sealing body 100. The tapered thread 1021 is used to connect with the internal thread on the wellhead. This enables the outer periphery of the sealing body 100 to be sealedly connected to the wellhead and enhances the connection reliability between the optical cable sealing device of the oil production wellhead and the wellhead. The packing 130 is connected in the second through-hole 1013. By connecting the packing 130 in the second through-hole 1013, it is prevented that the packing 130 shifts during operation and affects the sealing effect of the device.

[0042] See Figure 1 and Figure 4, the installation through-hole further includes a tapered through-hole located at the top of the second through-hole 1013. The bottom diameter of the tapered through-hole is smaller than the diameter of the second through-hole 1013. The tapered column 123 of the packing gland 120 is matched with the tapered through-hole. By making the bottom diameter of the tapered through-hole smaller than the diameter of the second through-hole 1013, the top of the packing 130 is smaller than the bottom, so that the force exerted on the packing 130 by the tapered column 123 is greater than the force exerted by a straight column with the same diameter as the second through-hole 1013 (when the same acting force increases in the force-receiving area, the pressure will decrease; conversely, when the force-receiving area decreases, the pressure will increase), improving the compaction effect of the packing 130 and ensuring the sealing effect of the device.

[0043] See Figure 2 , the outer side of the sealing body 100 forms a sealing part 101 that seals with the wellhead. A plurality of pipe wrench slots 1011 are provided on the sealing part 101 for clamping with a pipe wrench installed on the wellhead. By providing a plurality of pipe wrench slots 1011 on the outer side of the sealing body 100, it is convenient to install the sealing body 100 on the pipe wrench.

[0044] See Figure 1 , the packing 130 is a graphite packing 130. Utilizing the characteristics of graphite being corrosion-resistant and high-temperature-resistant to improve the service life of the packing 130.

[0045] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical cable sealing device for an oil production wellhead, characterized in that, Comprising: A sealing body, on which an installation through-hole is provided for the optical cable to pass through. A compensation base, on which a sealing hole is provided. The compensation base includes several base components. After the several base components are buckled, the optical cable is connected in the sealing hole. The compensation base is connected to the inner side of the installation through-hole. A packing, which is located at the upper end of the compensation base and is used to seal the gap between the optical cable and the installation through-hole. A packing gland, on which a sealing through-hole is provided. The packing gland includes several gland components. After the several gland components are buckled, the optical cable is connected in the sealing through-hole. The bottom of the packing gland abuts against the top of the packing.

2. The oil production wellhead optical cable sealing device according to claim 1, characterized in that, The compensation base is integrally cylindrical, including a convex ring portion and a cylindrical portion. The convex ring portion is located at the top of the cylindrical portion, and the diameter of the convex ring portion is larger than that of the cylindrical portion.

3. The optical cable sealing device for an oil production wellhead according to claim 1, characterized in that, The packing gland is connected to the top of the sealing body.

4. The oil production wellhead optical cable sealing device according to claim 3, characterized in that, The packing gland includes a disc portion and a tapered column. The disc portion is located at the top of the tapered column. The disc portion is connected to the top of the sealing body, and the bottom of the tapered column abuts against the top of the packing.

5. The optical cable sealing device for an oil production wellhead according to claim 4, characterized in that, Several positioning holes are provided on the disc portion, and several threaded holes corresponding to the positioning holes are provided on the top of the sealing body. Connecting bolts pass through the positioning holes and are screwed with the threaded holes.

6. The optical cable sealing device for an oil production wellhead according to claim 2, characterized in that, The sealing body is integrally cylindrical. The installation through-hole includes a first through-hole and a second through-hole. The diameter of the second through-hole is larger than that of the first through-hole. The ring portion of the compensation base is located at the top of the side wall of the first through-hole.

7. The oil production wellhead optical cable sealing device according to claim 6, characterized in that, A taper thread is provided on the outer circumference of the sealing body for connection with the internal thread on the wellhead.

8. The optical cable sealing device for an oil production wellhead according to claim 6, characterized in that, The installation through-hole further includes a tapered through-hole, which is located at the top of the second through-hole. The bottom diameter of the tapered through-hole is smaller than that of the second through-hole. The tapered column of the packing gland is matched with the tapered through-hole.

9. The oil production wellhead optical cable sealing device according to claim 7, characterized in that, Several pipe wrench clamping grooves are provided on the outer side of the sealing body, and the pipe wrench clamping grooves are located at the upper end of the taper thread.

10. The oil production wellhead optical cable sealing device according to any one of claims 1-8, characterized in that The packing is a graphite packing.

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