Oil and gas well permanent distributed optical fiber deployment device

Abstract

The utility model provides a permanent distributed optical fiber deployment device for an oil and gas well. The device comprises a well bottom far end, an oil pipe middle part and a well mouth near end, the well bottom far end comprises an oil pipe and a downward-entering optical cable which are arranged in a sleeve, the lower portion of the oil pipe is connected with a punching pipe, the chamfering portion of the chamfering oil pipe is inserted into a through hole of a round plug with a hole, pressure meter supporting cylinders are arranged at different positions of the oil pipe, and the pressure meter supporting cylinders are connected with the downward-entering optical cable; an optical cable protector is arranged in the middle of the oil pipe, the wellhead near end comprises an oil pumping unit pump assembly and a cable passing packer, the oil pumping unit pump assembly is connected with the upper portion of the oil pipe, and the cable passing packer is arranged on the lower portion of the oil pipe. The cable passing packer is used for sealing an oil pipe and enabling a cable to pass through, and a penetrating sealing assembly is arranged on one side of the cable passing packer. Through combined use of the optical fiber protector, the coupler and other devices and a production pipe column, not only are safe tripping-in and long-term stable working states of distributed optical fibers realized, but also random matching and combination of testing tools such as an underground pressure gauge and the like are realized.

Description

Technical Field

[0001] This utility model relates to the field of oil well exploration technology, and in particular to a permanent distributed optical fiber deployment device for oil and gas wells. Background Technology

[0002] Real-time monitoring of the production process of oil and gas wells using distributed optical fibers can provide important information about the production profile, wellbore integrity, and production string conditions, which are crucial for the daily maintenance, life extension, and optimization of production plans.

[0003] There are two ways to deploy optical fibers downhole: permanent and retrievable. In the permanent method, once the optical fiber is deployed, it becomes part of the production tubing structure and lasts throughout the entire life cycle of oil and gas production. In the retrievable method, the optical fiber is deployed into the well before the operation and retrieved after the operation to monitor a specific operation or stage.

[0004] Due to the differences in well types and production methods in oil and gas production, the deployment methods, devices, and tools for permanent fiber optic cables exhibit complexity and diversity. Existing solutions do not provide a complete system for comprehensive deployment of equipment for horizontal oil wells with production tubing. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0006] Therefore, one objective of this utility model is to propose a permanent distributed optical fiber deployment device for oil and gas wells, filling the gap in the domestic oil and gas field development industry in the sub-field of permanent optical fiber deployment for horizontal oil wells with production tubing.

[0007] To achieve the above objectives, one embodiment of the present invention provides a permanent distributed optical fiber deployment device for oil and gas wells, including a far end at the bottom of the well, a middle section of the tubing, and a near end at the wellhead.

[0008] The bottom end of the well includes an oil pipe and a fiber optic cable installed in the casing. The lower part of the oil pipe is connected to a perforated pipe, and the bottom of the perforated pipe is connected to a chamfered oil pipe. A perforated plug is installed at the bottom of the casing. The chamfered part of the chamfered oil pipe is inserted into the through hole of the perforated plug. A pressure gauge support is installed at different positions of the oil pipe. The pressure gauge support is connected to the fiber optic cable.

[0009] A fiber optic cable protector is installed in the middle of the oil pipe. The fiber optic cable protector consists of two clips covering the outside of the oil pipe. The two ends of the clips are clamped at the oil pipe coupling position, and a fiber optic cable slot is provided on the clips to fix the fiber optic cable to one side of the oil pipe.

[0010] The wellhead proximal end includes a pump assembly and a cable pass-through packer. The pump assembly is connected to the upper part of the tubing, and the cable pass-through packer is installed at the lower part of the tubing. The cable pass-through packer is used to seal the tubing and allow the cable to pass through. A through-sealing component is provided on one side of the cable pass-through packer.

[0011] Furthermore, preferably, the pressure gauge holder contains a pressure gauge and a connector. The connector has an inlet end for a down-feed optical cable bus, an outlet end for an output end of the down-feed optical cable bus, and another outlet end for an output end of a down-feed optical cable branch line. The down-feed optical cable branch line is connected to the pressure gauge's built-in optical cable.

[0012] Further, preferably, the connector includes a main body and a top cover, which are detachably connected; the main body includes a sealing groove, an optical cable winding mechanism, an optical cable inlet, an optical cable outlet, and a fluid inlet; the optical cable enters from the optical cable inlet, is wound by the optical cable winding mechanism, and extends out through the optical cable outlet; the fluid inlet is connected to a pressurizing device.

[0013] Furthermore, preferably, the optical cable winding mechanism is a figure-eight shaped mechanism, including a fork-shaped groove and an arc-shaped shielding wall; the fork-shaped grooves are interconnected, and the arc-shaped shielding wall is embedded in the end of the fork-shaped groove and connected to the fork-shaped groove.

[0014] Further, preferably, the optical cable protector includes a clamping step provided at the top edge of the clasp body, a fixing slot provided on the side wall of the clasp body, and a clasp connecting pin slot and an optical cable groove provided on the side wall, wherein the optical cable groove is used to accommodate the optical cable.

[0015] Further, preferably, the clamping step includes an upper edge step and a lower edge step; the upper edge step is clamped on the upper end face of the oil pipe coupling position, and the lower edge step is clamped on the lower end face of the oil pipe coupling position.

[0016] Further, preferably, the through-sealing assembly includes an annular gasket, a compression sleeve, a compression cone, and a locking bolt; the annular gasket and the compression sleeve are both fitted over the outside of the optical cable, the compression sleeve is located at one end of the annular gasket, the compression cone is fitted over the outside of the compression sleeve, the sleeve of the locking bolt extends over the outside of the compression cone, and a sealing assembly is provided on the locking bolt.

[0017] Furthermore, preferably, the sealing assembly has two parts, including a first sealing ring and a second sealing ring.

[0018] Furthermore, preferably, the first sealing ring is disposed at the top opening of the optical cable and the locking bolt, and the second sealing ring is disposed at the connection between the groove in the middle of the locking bolt and the component being traversed.

[0019] The permanent distributed optical fiber deployment device for oil and gas wells provided according to the embodiments of this utility model has at least the following advantages compared with the prior art:

[0020] (1) An optical cable splicer is used to reconnect the optical fiber after it is cut due to the need of the laying process and to protect the connection point.

[0021] (2) Use a fiber optic cable protector. During the process of the fiber optic cable being lowered into the well with the downhole tool string, fix the fiber optic cable protector to the coupling of the tubing or perforated pipe and make it easy for the fiber optic cable to enter the trench of the protector.

[0022] (3) In the area where the perforated pipe is located in the tool string, the optical cable clip is used to attach the optical cable to the outer surface of the perforated pipe while avoiding the area of ​​the through hole on the perforated pipe, so as to avoid the impact on the optical cable when the fluid in the well flows into and out of the through hole.

[0023] (4) A locking and sealing assembly is used to fix and seal the optical cable at the bottom of the tool string, at the packer through hole, at the tubing through hole, and at the tree through hole.

[0024] By combining the above-mentioned device with the production tubing, not only is the safe installation and long-term stable operation of distributed optical fibers achieved, but also any combination of downhole pressure gauges and other testing tools is realized.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of a permanent distributed optical fiber deployment device for oil and gas wells, provided as an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the connector provided in an embodiment of the present utility model.

[0029] Figure 3 This is a schematic diagram of the optical cable protector provided in an embodiment of the present invention.

[0030] Figure 4 An exploded structural diagram of the through-sealing assembly provided in an embodiment of this utility model.

[0031] In the diagram: Dark gray frame — 1, sleeve; Light gray frame — 2, perforated pipe;

[0032] Brown frame—3. Tubing hanger; Red frame—4. Production tubing string;

[0033] Yellow frame – 5. Production tubing encapsulation device (including perforated tubing); Blue line – 6. Oil tubing;

[0034] Green frame—7. Pressure gauge holder (including pressure gauge); Orange line—8. Optical fiber cable;

[0035] Orange hexagon—9. Splicer; Pink wire frame—10. Optical cable compression and sealing assembly;

[0036] Purple frame - 11, Fiber optic cable protector; Black block - 12, Cable separator. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] like Figure 1 As shown in the figure, the present invention provides a permanent distributed optical fiber deployment device for oil and gas wells, including a far end at the bottom of the well, a middle part of the tubing, and a near end at the wellhead;

[0039] The distal end of the well bottom includes an oil pipe 6 and a fiber optic cable 8 installed in the casing 1. The lower part of the oil pipe 6 is connected to a perforated pipe 2, and the bottom of the perforated pipe 2 is connected to a chamfered oil pipe. A perforated plug is installed at the bottom of the casing 1. The chamfered part of the chamfered oil pipe is inserted into the through hole of the perforated plug. Pressure gauge holders 7 are provided at different positions on the oil pipe 6. The pressure gauge holders 7 are connected to the fiber optic cable 8. Further, preferably, a pressure gauge and a connector 9 are provided inside the pressure gauge holder. The inlet end of the connector 9 is provided with the fiber optic cable bus, one outlet end is the output end of the fiber optic cable bus, and the other outlet end is the output end of the fiber optic cable branch line. The fiber optic cable branch line is connected to the built-in fiber optic cable of the pressure gauge.

[0040] like Figure 2 As shown, the connector 9 includes a main body 901 and a top cover, which are detachably connected. The main body includes a sealing groove, an optical cable winding mechanism 904, an optical cable inlet, an optical cable outlet, and a fluid inlet. The optical cable 8 enters from the optical cable inlet 902, is wound by the optical cable winding mechanism, and extends out through the optical cable outlet 903. The fluid inlet is connected to a pressurizing device.

[0041] The optical cable winding mechanism is a figure-eight shaped mechanism, including a forked groove and an arc-shaped shielding wall; the forked grooves are interconnected, and the arc-shaped shielding wall is embedded in the end of the forked groove and connected to the forked groove.

[0042] like Figure 3 As shown, a fiber optic cable protector 11 is installed in the middle of the oil pipe 6. The fiber optic cable protector 11 is covered by two clips on the outside of the oil pipe 6. The two ends of the clips are clamped at the coupling position of the oil pipe 6, and a fiber optic cable slot 1101 is provided on the clips to fix the fiber optic cable 8 to one side of the oil pipe 6.

[0043] The optical cable protector includes a clamping step 1102 provided on the top edge of the clasp body, a fixing slot provided on the side wall of the clasp body, and a clasp connecting pin slot and an optical cable groove provided on the side wall, wherein the optical cable groove is used to accommodate the optical cable 8.

[0044] Furthermore, preferably, the clamping step includes an upper edge step and a lower edge step; the upper edge step is clamped on the upper end face of the coupling position of the oil pipe 6, and the lower edge step is clamped on the lower end face of the coupling position of the oil pipe 6.

[0045] The wellhead near end includes a pump assembly and a cable packer 12. The pump assembly is connected to the upper part of the tubing 6, and the cable packer 12 is installed at the lower part of the tubing 6. The cable packer is used to seal the tubing 6 and allow the cable to pass through. A through-sealing component is provided on one side of the cable packer.

[0046] like Figure 4 As shown, the through-sealing assembly includes an annular gasket 801, a compression sleeve 802, a compression cone 803, and a locking bolt 804. The annular gasket 801 and the compression sleeve 802 are both fitted over the optical cable 8. The compression sleeve 802 is located at one end of the annular gasket 801. The compression cone 803 is fitted over the compression sleeve 802. The sleeve of the locking bolt 801 extends over the compression cone. A sealing assembly is provided on the locking bolt.

[0047] Furthermore, preferably, the sealing assembly has two parts, including a first sealing ring and a second sealing ring.

[0048] Further, preferably, the first sealing ring is disposed at the top opening of the optical cable 8 and the locking bolt, and the second sealing ring is disposed at the connection between the groove in the middle of the locking bolt and the component being traversed. Optical cable clamping and sealing components are provided on both the left and right sides of the component being traversed. When the optical cable clamping and sealing components are located on the right side of the component being traversed, they are sequentially fitted onto the surface of the optical cable in the order of locking bolt, clamping cone, and clamping rubber sleeve. When located on the left side of the component being traversed, they are sequentially fitted onto the surface of the optical cable in the order of clamping rubber sleeve, clamping cone, and locking bolt.

[0049] When running it down, first connect one bottom perforated plug, one chamfered tubing, and the first pressure gauge support at the toe of the horizontal section at the wellhead;

[0050] The optical cable coiled on the ground drum is released to the wellhead, and the free end and toe end of the optical cable are connected via an optical cable splicer. Figure 1 The pressure gauge is embedded in the pressure gauge holder at the horizontal end. The free end of the optical cable is connected to the inlet of the optical cable splice, and the outlet of the optical cable splice is connected to the fiber optic pressure gauge.

[0051] At the wellhead, continue connecting the oil tubing, fiber optic cable protector, and fiber optic cable to the perforated pipe location.

[0052] Continue connecting to the oil pipe and attach the optical cable to the outer surface of the oil pipe through the optical cable protector until the length of the oil pipe lowered reaches the designed production layer length of the horizontal section.

[0053] Install a second pressure gauge support at the other end of the perforated pipe, followed by the installation of multiple fiber optic cable protectors at the oil pipe.

[0054] Connecting to pump unit components, cable packers, cross-pass sealing components, fiber optic splices, etc.

[0055] Finally, the oil pipe is connected to the oil pipe hanger, and a crossing sealing device is installed on the oil pipe hanger to connect the optical cable to the ground optical cable connector. The deployment is then completed by connecting to ground detection equipment, etc.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent distributed optical fiber deployment device for oil and gas wells, characterized in that, The well bottom far end, the oil pipe middle part and the well mouth near end; The well bottom far end includes setting the oil pipe in the casing and lowering the optical cable, the lower part of the oil pipe is connected with the perforating pipe, the bottom of the perforating pipe is connected with the chamfered oil pipe, the bottom of the casing is provided with the hole round plug, the chamfered part of the chamfered oil pipe is inserted into the through hole of the hole round plug, the pressure gauge holder is arranged at different positions of the oil pipe, and the pressure gauge holder is connected with the lowered optical cable; The optical cable protector is arranged at the oil pipe middle part, the optical cable protector is wrapped outside the oil pipe by two slips, the two ends of the slip are clamped at the position of the oil pipe coupling, and the optical cable clamping groove is arranged on the slip, so that the optical cable is fixed on one side of the oil pipe; The well mouth near end includes the pumping unit assembly and the cable passing packer, the upper part of the oil pipe is connected with the pumping unit assembly, and the lower part of the oil pipe is provided with the cable passing packer; the cable passing packer is used for sealing the oil pipe and allowing the cable to pass through, and the cable passing packer is provided with the through sealing assembly on one side.

2. The permanent distributed fiber optic installation for oil and gas wells of claim 1, wherein, The pressure gauge holder is internally provided with the pressure gauge and the adapter, the inlet end of the adapter is provided with the lowered optical cable bus, one outlet end is used as the output end of the lowered optical cable bus, and the other outlet end is used as the output end of the lowered optical cable branch line; the lowered optical cable branch line is connected with the built-in optical cable of the pressure gauge.

3. The permanent distributed fiber optic installation for oil and gas wells of claim 2, wherein, The adapter includes a main body and an upper cover, and the main body and the upper cover are detachably connected; the main body includes a sealing groove, an optical cable winding mechanism, an optical cable inlet, an optical cable outlet and a fluid inlet; the optical cable enters from the optical cable inlet, is wound through the optical cable winding mechanism and then extends out through the optical cable outlet, and the fluid inlet is connected with a pressurizing device.

4. The permanent distributed fiber optic installation for oil and gas wells of claim 3, wherein, The optical cable winding mechanism is in the shape of an 8, and includes a fork-shaped groove and an arc-shaped shielding wall; the fork-shaped grooves are cross-connected, and the arc-shaped shielding wall is embedded in the end of the fork-shaped groove and connected with the fork-shaped groove.

5. The permanent distributed fiber optic installation for oil and gas wells of claim 1, wherein, The optical cable protector includes a clamping step arranged on the top edge of the slip body, a fixing notch arranged on the side wall of the slip body, a slip connecting pin groove and an optical cable groove arranged on the side wall, and the optical cable groove is used for accommodating the optical cable.

6. The permanent distributed fiber optic installation apparatus for oil and gas wells of claim 5, wherein, The clamping step includes an upper step and a lower step; the upper step is clamped on the upper end face of the position of the oil pipe coupling, and the lower step is clamped on the lower end face of the position of the oil pipe coupling.

7. The permanent distributed fiber optic installation for oil and gas wells of claim 1, wherein, The through sealing assembly includes an annular sleeve pad, a compression rubber sleeve, a compression cone basket and a locking bolt; the annular sleeve pad and the compression rubber sleeve are arranged outside the optical cable, the compression rubber sleeve is arranged at one end of the annular sleeve pad, the compression rubber sleeve is arranged outside the compression cone basket, the sleeve of the locking bolt is arranged outside the compression cone basket, and the locking bolt is provided with a sealing assembly.

8. The permanent distributed fiber optic installation for oil and gas wells of claim 7, wherein, The sealing assembly is provided with two first sealing rings and second sealing rings.

9. The permanent distributed fiber optic installation for oil and gas wells of claim 8, wherein, The first sealing ring is arranged at the position where the optical cable and the top opening of the locking bolt meet, and the second sealing ring is arranged at the position where the locking bolt and the through assembly meet.

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