A dissolvable pumping device for hydro-pumping operations of fiber optic cables

Abstract

The application discloses a soluble pumping device for hydraulic pumping operation of an optical fiber cable, and solves the problems of possible sticking and sealing and connectivity of the optical fiber end in the well of the existing pumping device. The technical scheme comprises a body and an optical fiber cable, the front end of the body is provided with a soluble guide cone, the body is provided with a soluble pumping ring, the body is a soluble body, a sealing unit is arranged in the rear section of the body, the sealing unit comprises a cylinder, the rear section of the cylinder is provided with a cable locking structure, and the front section is provided with a sealing bin; the end of the optical fiber protection tube loaded with the optical fiber part penetrates through the body, the cylinder and the cable locking structure and then extends into the sealing bin, wherein the optical fiber part in the optical fiber protection tube is arranged in the sealing bin, and the cable armored steel wire part is fixedly connected with the cable locking structure. The application has the advantages of simple and compact structure, difficulty in sticking, easy installation, and meeting the sealing and connectivity requirements of the optical signal optical fiber of the optical fiber cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of petroleum logging instrument, in particular to a soluble pumping device for optical fiber cable hydraulic pumping operation. BACKGROUND

[0002] At present, optical fiber cable horizontal well logging usually adopts tractor and hydraulic pumping for logging, and these downhole tools are connected with the cable usually by using a hames, and the hames used at present are all made of steel and have a large outer diameter. After the operation is completed, when the cable is pulled up, the casing is deformed, although the pumping ring is made of soluble material, but the hames and the tractor of the conveying tool may still be stuck at the deformed position of the casing, which may cause the cable to be damaged and even broken. SUMMARY

[0003] The present application aims at solving the above technical problems, and provides a soluble pumping device which has a simple and compact structure, is not easy to be stuck, is easy to install, and meets the sealing and connecting requirements of the optical signal optical fiber of the optical fiber cable.

[0004] The soluble pumping device comprises a body and an optical fiber cable, the front end of the body is provided with a soluble guide cone, and the body is provided with a soluble pumping ring; the optical fiber cable is composed of an optical fiber part located in an optical fiber protection tube and a cable armored steel wire part located outside the optical fiber protection tube; the body is a soluble body, a sealing unit is arranged in the rear section of the body, the sealing unit comprises a barrel, the front section of the barrel is provided with a cable locking structure, and the rear section is provided with a sealing bin.

[0005] The end of the optical fiber protection tube provided with the optical fiber part penetrates through the body, the barrel and the cable locking structure and extends into the sealing bin, wherein the optical fiber part in the optical fiber protection tube is arranged in the sealing bin, and the cable armored steel wire part is fixedly connected with the cable locking structure.

[0006] The rear end of the sealing bin is provided with a sealing cover.

[0007] The sealing cover and the inner wall of the barrel are connected by a thread.

[0008] The sealing bin is filled with silicone grease.

[0009] The cable locking structure comprises a cable locking sleeve, a first pressing block, a sealing block and a second pressing block which are sequentially pressed towards the front end of the barrel; the optical fiber part of the optical fiber cable sequentially penetrates through the cable locking sleeve, the first pressing block, the sealing block and the second pressing block and enters the sealing bin, and the cable armored steel wire part of the optical fiber cable is fixedly wound on the cable locking sleeve.

[0010] The first and second pressing blocks are connected with the inner wall of the barrel by screw thread.

[0011] The sealing chamber is provided with an optical fiber fixing device.

[0012] The optical fiber fixing device comprises a fixing body arranged on the inner wall of the barrel, the top surface of the fixing body is provided with a plurality of slot holes for inserting the optical fiber part of the optical fiber cable, and the top surface of the fixing body is further provided with a fixing pressing block, and the two are connected by a fixing screw.

[0013] The middle section of the body is provided with a fixing ring for fixing the sealing unit.

[0014] In view of the problems in the background art, the inventors have made the following improvements:

[0015] 1) A sealing unit is arranged in the soluble pumping device, and the optical fiber part of the optical fiber cable is sealed by the sealing unit, considering the particularity of the downhole working condition, the cable armored steel wire part also needs to be effectively fixed; the front section of the barrel of the sealing unit is provided with a cable locking structure for fixing the cable armored steel wire part, so as to realize fixed connection with the barrel; the front section of the barrel is provided with a sealing chamber, the optical fiber part of the optical fiber cable is placed in the sealing chamber, and the sealing state of the optical fiber is ensured under any condition.

[0016] 2) Considering the sealing effect, a sealing cover is arranged at the front end of the sealing chamber, the sealing effect in the sealing chamber is ensured by the sealing cover, so that the optical fiber part can be well sealed in the sealing chamber and cannot contact the liquid in the well, thereby effectively avoiding the entry of the downhole liquid into the optical fiber protection tube.

[0017] 3) An optical fiber fixing device is arranged in the sealing chamber, the end part of the optical fiber part is fixed by the optical fiber fixing device, so that the optical fiber remains in a relatively static state, meanwhile, the gap part in the sealing chamber is filled with silicone grease, the sealing space is further closed to prevent the entry of the downhole liquid, the optical fiber part is fixed, the damage of the optical fiber part in the movement process is avoided, and the sealing effect is further improved.

[0018] 4) The present application not only ensures the sealing and connectivity of the optical fiber cable, but also has a small size, when the soluble body, the soluble guide cone and the soluble pumping ring of the present application are dissolved in the downhole, only the sealing unit and the optical fiber cable are left, the barrel of the sealing unit has a small diameter and can easily pass through the variable diameter sleeve to avoid the sticking phenomenon in the downhole.

[0019] The present application has the advantages of simple structure, easy disassembly and assembly, meeting the sealing and connectivity of the optical signal fiber of the optical fiber cable, not needing to use a horse collar to convert and connect the cable, ensuring the sealing of the optical fiber under any condition in the downhole, and having a wide market application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Structure diagram of the present application.

[0021] Figure 2 Structure diagram of the cable locking sleeve with the cable armored steel wire part wound thereon.

[0022] Figure 3 Structure diagram of the optical fiber fixing device.

[0023] 1-cylinder, 2-cable locking sleeve, 3-first pressing block, 4-sealing block, 5-second pressing block, 6-sealing cover, 7-optical fiber protection tube, 8-armored steel wire part, 9-sealing chamber, 10-optical fiber part, 11-optical fiber cable, 12-sealing ring, 13-grease injection hole, 14-optical fiber fixing device, 14.1-fixing body, 14.2-slot hole, 14.3-fixing pressing block, 14.4-fixing screw, 15-body, 16-fixing ring, 17-dissolvable guide cone, 18-dissolvable pumping ring. DETAILED DESCRIPTION

[0024] The present application will be further explained in conjunction with the accompanying drawings:

[0025] Referring to Figure 1 , the present application comprises a body 15 (being a dissolvable body) and an optical fiber cable 11, the front end of the body 15 is provided with a dissolvable guide cone 17 (being connectable through threads), the body 15 is sleeved with a dissolvable pumping ring 18 (two dissolvable pumping rings 18 are sleeved in front and back in the present embodiment), the optical fiber cable 11 is composed of an optical fiber part 10 located in the optical fiber protection tube 7 and a cable armored steel wire part 8 located outside the optical fiber protection tube 7, the rear section of the body 15 is provided with a sealing unit, the sealing unit comprises a cylinder 1, the front section of the cylinder 1 is provided with a cable locking structure, and the rear section is provided with a sealing chamber 9.

[0026] The end of the optical fiber cable 11 with the optical fiber protection tube 7 penetrates the front end of the cylinder 1 and the cable locking structure and extends into the sealing chamber 9, wherein the optical fiber part 10 of the optical fiber cable 11 is placed in the sealing chamber 9, and the cable armored steel wire part 8 is fixedly connected with the cable locking structure.

[0027] The cable locking structure comprises a cable locking sleeve 2, a first pressing block 3, a sealing block 4 and a second pressing block 5 which are sequentially pressed towards the front end of the cylinder 1; referring to Figure 2The cable locking sleeve 2 is a hollow structure, the optical fiber part 10 of the optical fiber cable 11 passes through the cable locking sleeve 2, the first pressing block 3, the sealing block 4 and the second pressing block 5 in sequence into the sealing chamber 9, the cable armored steel wire part 8 of the optical fiber cable 11 is fixed by winding on the cable locking sleeve 2, and the winding mode is not particularly limited, for example, the cable armored steel wire part 8 is bent along the top surface and the side surface of the upper end of the cable locking sleeve 2, then is penetrated into the hole of the lower section of the cable locking sleeve 2 downwards, and then the steel wire is bent upwards along the side surface of the lower end of the cable locking sleeve 2.

[0028] The first pressing block 3 and the second pressing block 5 are connected with the inner wall of the barrel 1 by screw threads. After the first pressing block 3 is screwed with the barrel 1, pressure is applied to the cable locking sleeve 2, so that part of the cable armored steel wire 8 is embedded into the cable locking sleeve 2 and is fastened with the barrel 1 as a whole, thereby ensuring that the barrel 1 and the optical fiber cable 11 are not separated. After the second pressing block 3 is screwed with the barrel 1, force is applied to the sealing block 4, the sealing block 4 is made of elastic material (such as rubber), so that the sealing block 4 is deformed under the extrusion force, tightly contacts with the optical fiber protection tube 7, and the sealing effect is achieved.

[0029] The rear end of the sealing chamber 9 is provided with a sealing cover 6, the sealing cover 6 is also connected with the inner wall of the barrel 1 by screw threads, and a sealing ring 12 is arranged on the side surface to improve the sealing effect.

[0030] The sealing chamber 9 is provided with an optical fiber fixing device 14 and is filled with silicone grease, the silicone grease can be injected through the grease injection holes 13 arranged on the corresponding barrel 1 of the sealing chamber 9, see Figure 1 The two grease injection holes 13 are symmetrically arranged, and the grease injection hole 13 after the grease injection operation is sealed by a jackscrew.

[0031] Referring to Figure 3 The optical fiber fixing device 14 is used for fixing the end of the optical fiber part and comprises a fixing body 14.1 arranged on the inner wall of the barrel, a plurality of slot holes 14.2 for inserting and fixing the optical fiber part 10 of the optical fiber cable are arranged on the top surface of the fixing body 14.1, a fixing pressing block 14.3 is further arranged on the top surface of the fixing body 14.1, and the two are connected through a fixing screw 14.4.

[0032] When the downhole is stuck, only the sealing unit and the optical fiber cable 11 are left after the barrel 15, the soluble guide cone 17 and the soluble pumping ring 18 of the soluble pumping device of the present application are dissolved downhole, the diameter of the barrel 1 of the sealing unit is small, the sealing unit can easily pass through the variable-diameter sleeve, and the phenomenon of downhole sticking is avoided. Since the diameter of the barrel 1 can be made small, the barrel 1 will not be stuck in the well, and the smooth operation of the tool string can be ensured.

[0033] In another aspect, even if the body 1 is broken in any case, the downhole liquid enters the body 1, but since the end of the optical fiber cable is sealed in the sealing bin and is filled with grease, the optical fiber will not contact the downhole liquid, and there will be no possibility of the downhole liquid filling the optical fiber protection tube under pressure, avoiding damage to the optical fiber cable and significant economic losses.

Claims

1. A soluble pumping device for hydraulic pumping of optical fiber cables, comprising a body and an optical fiber cable, wherein the front end of the body is provided with a soluble guide cone, and the body is fitted with a soluble pumping ring, and the optical fiber cable consists of an optical fiber portion located inside an optical fiber protection tube and a cable armor steel wire portion located outside the optical fiber protection tube, characterized in that, The main body is a soluble body. The middle section of the main body is provided with a fixing ring for fixing the sealing unit. The rear section of the main body is provided with a sealing unit. The sealing unit includes a cylinder. The front section of the cylinder is provided with a cable locking structure. The rear section is provided with a sealing chamber. The rear end of the sealing chamber is provided with a sealing cover. The end of the fiber optic protective tube containing the fiber optic portion passes through the main body, the cylinder, and the cable locking structure and extends into the sealed chamber. The gap in the sealed chamber is filled with silicone grease. The fiber optic portion in the fiber optic protective tube is placed in the sealed chamber, and the cable armor steel wire portion is fixedly connected to the cable locking structure. The cable locking structure includes a cable locking sleeve, a first pressing block, a sealing block, and a second pressing block that are sequentially pressed against the front end of the cylinder. The optical fiber portion of the optical fiber cable passes through the cable locking sleeve, the first pressing block, the sealing block, and the second pressing block in sequence and enters the sealing chamber. The sealing block is made of an elastic material. The armored steel wire portion of the optical fiber cable is wound around the cable locking sleeve for fixation. The first pressing block and the second pressing block are connected to the inner wall of the cylinder by threaded connections. The sealed chamber is equipped with an optical fiber fixing device, which includes a fixing body on the inner wall of the cylinder. The top surface of the fixing body has multiple slots for inserting the optical fiber portion of the optical fiber cable. The top surface of the fixing body is also equipped with a fixing clamping block, and the two are connected by fixing screws.

2. The soluble pumping device for hydraulic pumping of optical fiber cables as described in claim 1, characterized in that, The sealing cap is connected to the inner wall of the cylinder by a threaded connection.

3. The soluble pumping device for hydraulic pumping of optical fiber cables as described in claim 1, characterized in that, The sealed chamber is filled with silicone grease.

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