Anti-freezing well logging blowout preventer
By introducing a heated jacket and zirconia ceramic tube into the blowout preventer, combined with a hydraulic pump-controlled dual-piston linkage seal, the problems of cable icing and high wear rate were solved, enabling safe cable lowering and downhole fluid sealing, reducing cable loss and extending cable life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG HILL INFORMATION TECHNOLOGY GROUP CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-05-15
AI Technical Summary
Existing blowout preventers are prone to freezing during winter testing, which can damage cables. Traditional flow-blocking tubes have high surface roughness, resulting in high cable wear rates, posing safety hazards and economic losses.
A heated jacket and a heating medium circulation pipeline are used to prevent the cable from freezing. Zirconia ceramic tubes are used instead of steel flow-blocking tubes. Combined with a hydraulic pump to control the dual piston linkage seal, the entire process of cable blowout prevention control is achieved.
It effectively avoids cable icing damage, reduces cable wear rate by 95%, extends cable life, enables safe and reliable cable lowering and well liquid sealing, and prevents environmental pollution.
Smart Images
Figure CN224244834U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil well logging testing technology, and in particular to an antifreeze logging blowout prevention device. Background Technology
[0002] Blowout preventers (BOPs) for well logging are commonly used tools in oilfields, but current BOPs suffer from problems such as cable damage and reduced cable lifespan. For example, during winter testing, ice may form between the BOP and the cable before the instrument is even lowered into the well, significantly complicating operations. Even after the instrument is lowered, if the cable stops operating during logging, ice can form between the BOP and the cable, increasing the load on the cable and potentially damaging it. This not only results in economic losses but also poses a significant safety hazard. Furthermore, traditional 300mm steel flow-blocking pipes suffer from limitations in manufacturing processes, leading to an inner diameter uniformity error of ±0.1mm, a surface roughness Ra≥0.5μm, and a friction coefficient ≥0.18 when the cable passes through, resulting in an armor wear rate >5%. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model discloses an antifreeze logging blowout preventer, which solves the technical problems of cable damage caused by icing between the blowout preventer box and the cable, and high wear rate of the cable armor layer caused by excessive surface roughness of the flow-blocking pipe.
[0004] This utility model is achieved through the following technical solution:
[0005] A freeze-resistant logging blowout preventer includes a heating jacket located outside the blowout preventer box. A heating medium inlet and a heating medium outlet are provided on the outer side wall of the heating jacket. A spiral heating medium circulation pipe is provided on the side wall where the blowout preventer box and the inner side wall of the heating jacket are attached. The heating medium inlet and the heating medium outlet are both connected to the heating medium circulation pipe.
[0006] It also includes a flow-blocking tube located at the bottom of the blowout preventer. The flow-blocking tube includes a zirconia ceramic tube and an alloy sleeve fitted on the outer wall of the zirconia ceramic tube. The zirconia ceramic tube is sealed to the alloy sleeve by vacuum brazing.
[0007] It also includes an upper sealing mechanism and a lower sealing mechanism that can be linked and sealed inside the blowout preventer box above the flow deflector.
[0008] Further optimized, the lower sealing mechanism includes a lower piston with a through-hole, a first sealing packing in the blowout preventer box between the lower piston and the baffle tube, a sealing sleeve on the rod of the lower piston, and a hydraulic port on the side wall of the heating sleeve that communicates with the inner cavity of the blowout preventer box located between the sealing sleeve and the head of the lower piston; the upper sealing mechanism includes an upper piston with a through-hole in the blowout preventer box located above the sealing sleeve, a second sealing packing in the blowout preventer box below the upper piston, a sealing cap on the top of the blowout preventer box, the rod of the upper piston extending out of the sealing cap, and the inner cavity of the blowout preventer box between the head of the upper piston and the sealing cap communicating with the hydraulic port through a pressure transmission pipe on the side wall of the blowout preventer box.
[0009] Further optimized, a lower overflow port is provided on the side wall of the heating jacket, which communicates with the inner cavity of the blowout preventer located between the lower piston and the baffle tube, and an upper overflow port is provided on the side wall of the heating jacket, which communicates with the inner cavity of the blowout preventer located between the second sealing packing and the sealing sleeve.
[0010] Furthermore, the inner sidewalls of both the upper and lower pistons are laser-clad with a nanocrystalline silicon carbide layer.
[0011] Further optimized, the sealing sleeve is a stepped sealing sleeve, and a shoulder is provided on the inner wall of the blowout preventer to restrict the upward movement of the stepped sealing sleeve.
[0012] Further optimized, a blocking sleeve is provided below the second sealing packing to abut against the second sealing packing, and a shoulder is provided on the inner wall of the blowout preventer to restrict the downward movement of the blocking sleeve.
[0013] In a further optimized configuration, the flow-blocking tube is detachably connected to the blowout preventer via a blocking nut.
[0014] The beneficial effects of this utility model are as follows:
[0015] This invention heats the blowout preventer box by introducing a heating medium into the heating medium circulation pipe, thereby preventing ice formation between the blowout preventer box and the cable and thus avoiding cable damage. On the other hand, by using a zirconia ceramic tube for the flow-blocking pipe, the cable wear rate is reduced by 95% compared to the existing steel flow-blocking pipe, thus achieving the purpose of reducing cable loss and increasing cable life.
[0016] This patented technology uses a hydraulic pump to control a dual-piston linkage compression seal, and adjusts the compression pressure in real time (0-100MPa adjustable). Combined with dynamic pressure relief from the upper and lower overflow ports, it achieves full-process control of cable lowering and overflow sealing, solving the technical problem that downhole liquid can still easily spray out from the top of the blowout preventer, polluting the environment. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] In the diagram, 1. Blowout preventer, 2. Lower piston, 3. First sealing packing, 4. Lower overflow port, 5. Hydraulic interface, 6. Upper piston, 7. Second sealing packing, 8. Upper overflow port, 9. Sealing cap, 10. Pressure transmission pipe, 11. Blowout preventer connector, 12. Heating medium circulation pipe, 13. Steel wire armored cable, 14. Zirconia ceramic tube, 15. Alloy sleeve, 16. Sealing sleeve, 17. Barrier sleeve, 18. Barrier nut, 19. Nanocrystalline silicon carbide layer, 20. Heating jacket, 21. Heating medium inlet, 22. Heating medium outlet. Detailed Implementation
[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0021] like Figure 1 As shown, an antifreeze logging blowout preventer includes a heating jacket 20 located outside the blowout preventer box 1. A heating medium inlet 21 and a heating medium outlet 22 are provided on the outer side wall of the heating jacket 20. A spiral heating medium circulation pipe 12 is provided on the side wall of the blowout preventer box 1 that is in contact with the inner side wall of the heating jacket 20. The heating medium inlet 21 and the heating medium outlet 22 are both connected to the heating medium circulation pipe 12.
[0022] It also includes a flow-blocking tube located at the bottom of the blowout preventer 1. The flow-blocking tube includes a zirconia ceramic tube 14 and an alloy sleeve 15 sleeved on the outer wall of the zirconia ceramic tube 14. The zirconia ceramic tube 14 is sealed to the alloy sleeve 15 by vacuum brazing. It also includes an upper sealing mechanism and a lower sealing mechanism that can be linked and sealed inside the blowout preventer 1 above the flow-blocking tube.
[0023] The heating equipment is connected to the heating medium inlet 21 through a pipeline. The heating medium enters the heating medium circulation pipeline 12 to heat the blowout preventer box, thereby preventing ice formation between the blowout preventer box 1 and the cable, which could lead to cable damage. After heat exchange, the heating medium flows out from the heating medium outlet 22, which can be connected to the heating equipment to realize the recycling of the heating medium.
[0024] Traditional steel flow-blocking pipes suffer from limitations in processing technology, resulting in an inner diameter uniformity error of ±0.1mm, a surface roughness Ra≥0.5μm, and a friction coefficient ≥0.18 when cables pass through, leading to an armor wear rate >5%. This patented flow-blocking pipe uses zirconia ceramic tubing, with an inner diameter uniformity error ≤0.02mm, reducing cable wear rate by 95% compared to existing steel flow-blocking pipes. Steel materials have low hardness (HV 200-300), resulting in a wear rate ≥15μm / 10,000 cycles under sand-containing fluid scouring, requiring ≥10 replacements per well per year, with maintenance costs exceeding 100,000 yuan. In contrast, this patented flow-blocking pipe uses an alloy sleeve, such as one made of Inconel 718 alloy, extending the maintenance-free period of the flow-blocking pipe to 3 years.
[0025] In some embodiments, the lower sealing mechanism includes a lower piston 2 with a through-hole, a first sealing packing 3 in a blowout preventer 1 between the lower piston 2 and the flow deflector, a sealing sleeve 16 on the rod of the lower piston 2, a hydraulic port 5 on the side wall of the heating sleeve 20 communicating with the cavity of the blowout preventer 1 located between the sealing sleeve 4 and the head of the lower piston 2, an upper piston 6 with a through-hole in the blowout preventer 1 above the sealing sleeve 16, a second sealing packing 7 in the blowout preventer 1 below the upper piston 6, a sealing cap 9 on the top of the blowout preventer 1, the rod of the upper piston 6 extending out of the sealing cap 9, and the cavity of the blowout preventer 1 between the head of the upper piston 6 and the sealing cap 9 communicating with the hydraulic port 5 through a pressure transmission pipe 10 on the side wall of the blowout preventer 1.
[0026] In some embodiments, a lower overflow port 4 is provided on the side wall of the heating jacket 20, which communicates with the inner cavity of the blowout box 1 located between the lower piston 2 and the flow deflector, and an upper overflow port 8 is provided on the side wall of the heating jacket 20, which communicates with the inner cavity of the blowout box 1 located between the second sealing packing 7 and the sealing sleeve 16.
[0027] The first sealing packing 3 and the second sealing packing 7 are made of fluororubber-aramid fiber composite gradient material with a surface hardness of Shore A98 and a core hardness of Shore A75. The radial shrinkage rate after pressure is ≥45%. The oil pressure interface 5 is connected to the hydraulic pump. The blowout preventer of this patent is connected to the blowout preventer pipe through the blowout preventer pipe joint 11.
[0028] During the cable lowering stage, the lower overflow port 4 is opened to release pressure. The hydraulic pump drives the lower piston 2 to release the pressure of the first sealing packing 3, controlling the pressure release of the lower overflow port 4, and the cable is successfully lowered into the well.
[0029] After the cable is in place, the overflow sealing stage begins. The lower overflow port 4 is closed, and the flow-blocking pipe achieves primary blowout prevention, blocking most of the fluid coming from downhole. However, if the well pressure is high, fluid will continue to rise through the gaps in the wire-armored cable 13. After the hydraulic pump starts, high-pressure hydraulic oil enters the blowout preventer box 1 through the oil pressure port 5. Under the pressure of the high-pressure oil, the upper piston 6 and lower piston 2 simultaneously push the first sealing packing 3 and the second sealing packing 7, forcing the sealing packings to squeeze inwards and outwards respectively, thus sealing the wire-armored cable and achieving secondary and tertiary blowout prevention. The secondary and tertiary blowout prevention continue to block fluid coming out from the gaps in the wire-armored cable. A very small portion of the fluid exits through the upper overflow port 8 and flows into the recovery tank, preventing fluid from spraying out and causing environmental pollution.
[0030] Based on well pressure fluctuations (±10MPa), the hydraulic pump automatically adjusts the piston pressure to maintain the sealing interface pressure at 25±0.5MPa, thus preventing overpressure damage to the cable.
[0031] This patent uses a hydraulic pump to control the dual pistons in a linked compression seal, and adjusts the compression pressure in real time (0-100MPa adjustable). Combined with dynamic pressure relief from the upper and lower overflow ports, it achieves full-process control of cable lowering and overflow sealing.
[0032] In some embodiments, the inner sidewalls of both the upper piston 6 and the lower piston 2 are laser-clad with a nanocrystalline silicon carbide layer 19. The working surfaces of the two pistons are made of ceramic material. Utilizing the good machining accuracy and low surface roughness of ceramic material, the coaxiality of the pistons can be improved, and the radial runout of the piston can be maintained at <3μm, with the maximum scratch depth on the surface of the cable armor layer ≤0.8μm.
[0033] In some embodiments, the sealing sleeve 16 is a stepped sealing sleeve, and a shoulder is provided on the inner wall of the blowout preventer 1 to restrict the upward movement of the stepped sealing sleeve.
[0034] In some embodiments, a blocking sleeve 17 is provided below the second sealing packing 7 to abut against the second sealing packing 7, and a shoulder is provided on the inner wall of the blowout preventer 1 to restrict the downward movement of the blocking sleeve 17.
[0035] In some embodiments, the flow-blocking tube is detachably connected to the blowout preventer 1 via a blocking nut 18.
[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.
[0037] Any aspects of this utility model not described in detail are known to those skilled in the art.
Claims
1. A freeze-resistant well logging blowout prevention device, characterized in that: It includes a heating jacket located outside the blowout preventer, with a heating medium inlet and a heating medium outlet on the outer side wall of the heating jacket, and a spiral heating medium circulation pipe on the side wall where the blowout preventer and the inner side wall of the heating jacket are attached, with the heating medium inlet and the heating medium outlet both connected to the heating medium circulation pipe. It also includes a flow-blocking tube located at the bottom of the blowout preventer. The flow-blocking tube includes a zirconia ceramic tube and an alloy sleeve fitted on the outer wall of the zirconia ceramic tube. The zirconia ceramic tube is sealed to the alloy sleeve by vacuum brazing. It also includes an upper sealing mechanism and a lower sealing mechanism that can be linked and sealed inside the blowout preventer box above the flow deflector.
2. The antifreeze logging blowout prevention device according to claim 1, characterized in that: The lower sealing mechanism includes a lower piston with a through-hole, a first sealing packing in the blowout preventer box between the lower piston and the baffle tube, a sealing sleeve on the rod of the lower piston, and a hydraulic port on the side wall of the heating sleeve that communicates with the inner cavity of the blowout preventer box located between the sealing sleeve and the head of the lower piston. The upper sealing mechanism includes an upper piston with a through-hole in the blowout preventer box located above the sealing sleeve, a second sealing packing in the blowout preventer box below the upper piston, a sealing cap on the top of the blowout preventer box, the rod of the upper piston extending out of the sealing cap, and the inner cavity of the blowout preventer box between the head of the upper piston and the sealing cap communicating with the hydraulic port through a pressure transmission pipe on the side wall of the blowout preventer box.
3. The antifreeze logging blowout prevention device according to claim 2, characterized in that: The heating jacket sidewall is provided with a lower overflow port that communicates with the inner cavity of the blowout preventer located between the lower piston and the baffle tube, and the heating jacket sidewall is provided with an upper overflow port that communicates with the inner cavity of the blowout preventer located between the second sealing packing and the sealing sleeve.
4. The antifreeze logging blowout prevention device according to claim 2, characterized in that: The inner sidewalls of both the upper and lower pistons are laser-clad with nanocrystalline silicon carbide layers.
5. The antifreeze logging blowout prevention device according to claim 2, characterized in that: The sealing sleeve is a stepped sealing sleeve, and a shoulder is provided on the inner wall of the blowout preventer to restrict the upward movement of the stepped sealing sleeve.
6. The antifreeze logging blowout prevention device according to claim 2, characterized in that: A blocking sleeve is provided below the second sealing packing to abut against the second sealing packing, and a shoulder is provided on the inner wall of the blowout preventer to restrict the downward movement of the blocking sleeve.
7. The antifreeze logging blowout prevention device according to claim 1, characterized in that: The flow-blocking tube is detachably connected to the blowout preventer via a blocking nut.