Anti-falling device for heat insulation oil pipe
By designing a heat-insulating oil pipe anti-falling device for gas injection of oil wells, the anchoring of the tile and the locking of the piston is achieved by using n-octane expansion force and spring compression force, the problem of the heat-insulating pipe falling off the well during gas injection is solved, and the safe fixing and maintenance cost of the heat-insulating pipe is achieved.
Patent Information
- Application Number
- CN202421349144.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-13
AI Technical Summary
During the gas injection process of oil wells, the gas injection insulation pipe column falls off the well due to peristalsis and thermal expansion and contraction, causing damage to the bottom of the well equipment and difficulty in repairing, which increases maintenance costs.
A heat-insulating oil pipe anti-falling device is designed, including a central tube, sheath, upper joint, cone, caulking seat, caulking, hoop spring, spring, locking block and cylinder liner. Through the expansion force of n-octane and the compression force of the spring, the caulking anchoring and the piston locking are achieved to prevent the heat-insulating pipe from falling off.
It effectively prevents the heat insulation pipe from falling off the well during gas injection, eliminates accidents caused by the heat insulation pipe falling off, and reduces maintenance costs and difficulty.
Smart Images
Figure CN222615284U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of downhole tools in the petroleum industry, in particular to a heat-insulating oil pipe anti-falling device. Background Art
[0002] During the gas injection process in oil wells, the gas injection insulation pipe string will creep due to the influence of gas injection, and will also expand and contract due to thermal expansion and contraction. Due to the above reasons, the gas injection pipe string often falls off the well. After falling into the well, the gas injection pipe string will be deformed and damaged due to gravity, and the bottom hole hanger or casing may be damaged, making subsequent maintenance difficult or even causing major overhauls, with high maintenance costs. Summary of the invention
[0003] The utility model aims to provide a heat-insulating oil pipe anti-falling device, which is connected to the lowermost end of a pipe string and goes into a well along with a steam injection pipe string to prevent the heat-insulating pipe of a steam injection well from falling out of the well.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] The utility model is an insulated oil pipe anti-falling device, which is characterized by comprising a center tube, a sleeve on the outside of the center tube, an upper joint threadedly connected to the center tube, a cone threadedly connected to the upper joint, a cava seat threadedly connected to the sleeve, a cava arranged in the cava seat and sliding up and down, a hoop spring arranged in the cava groove, a spring and a locking block arranged in the sleeve, a piston fixed in the sleeve by the locking block, a cylinder sleeve threadedly connected to the lower end of the center tube, and a locking spring threadedly connected to the center tube.
[0006] The piston and the cylinder sleeve are filled with normal octane.
[0007] The central tube is provided with an O-ring I.
[0008] An O-ring II is arranged inside the piston, and an O-ring III is arranged outside the piston.
[0009] The central tube is provided with an O-ring IV.
[0010] Advantages of the utility model:
[0011] The utility model discloses a heat-insulating oil pipe anti-falling device, which is connected to the lowermost end of the pipe string and goes into the well along with the steam injection pipe string, effectively solves the problem of the heat-insulating pipe falling off the well during the steam injection process and prevents accidents caused by the heat-insulating pipe falling into the well. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0013] The specific implementation of the present utility model is further described below in conjunction with the accompanying drawings.
[0014] like Figure 1 As shown, the utility model of the heat-insulated oil pipe anti-falling device is characterized in that it includes a center tube 4, a sleeve 9 on the outside of the center tube 4, an upper joint 1 threadedly connected to the center tube 4, a cone 3 threadedly connected to the upper joint 1, a cava seat 7 threadedly connected to the sleeve 9, a cava 5 arranged in the cava seat 7 and sliding up and down, a hoop spring 6 arranged in the groove of the cava 5, a spring 8 and a locking block 10 arranged in the sleeve 9, a piston 11 fixed in the sleeve 9 by the locking block 10, a cylinder sleeve 17 threadedly connected to the lower end of the center tube 4, and a locking spring 15 threadedly connected to the center tube 4.
[0015] The piston 11 and the cylinder sleeve 17 are filled with n-octane 14 .
[0016] The central tube 4 is provided with an O-ring Ⅰ2.
[0017] An O-ring II 12 is disposed inside the piston 11 , and an O-ring III 13 is disposed outside the piston 11 .
[0018] The central tube 4 is provided with an O-ring IV16.
[0019] The working principle of the heat-insulated oil pipe anti-falling device of the utility model is as follows:
[0020] The device is connected to the lowermost end of the steam injection insulation pipe string through an upper joint. The steam injection pipe string can be lowered to the designed position in the well according to the engineering design requirements. When steam is injected into the steam injection pipe string, n-octane 14 begins to expand due to heat, and the expansion force forces the piston 11 to push the sheath 9 and the slip seat 7 upward, so that the slip 5 expands and is anchored to the oil well casing. The locking block 10 is released as the piston moves upward. At this time, the spring 8 is compressed to assist the slip 5 in anchoring. At the same time, the piston 11 drives the locking spring 15 (the locking spring 15 is a one-way sawtooth type and cannot move downward after moving upward) to lock the piston 11 upward to prevent it from moving downward. When it is necessary to lift out the steam injection pipe string, it can be lifted up. After lifting out one steam injection pipe, the pipe string can be rotated forward to make the cone 3 move upward. At this time, the slip 5 can be completely recovered with the assistance of the hoop spring 6. The slip 5 is a one-way slip, and even if it is not recovered, it will not produce resistance to lifting.
[0021] The utility model discloses a heat-insulating oil pipe anti-falling device, which is connected to the lowermost end of the pipe string and goes into the well along with the steam injection pipe string, effectively solves the problem of the heat-insulating pipe falling off the well during the steam injection process and prevents accidents caused by the heat-insulating pipe falling into the well.
Claims
1. A heat-insulated oil pipe anti-falling device, characterized in that: It includes a center tube, a sleeve on the outside of the center tube, an upper joint threadedly connected to the center tube, a cone threadedly connected to the upper joint, a cava seat threadedly connected to the sleeve, a cava arranged in the cava seat and sliding up and down, a hoop spring arranged in the cava groove, a spring and a locking block arranged in the sleeve, a piston fixed in the sleeve by the locking block, a cylinder sleeve threadedly connected to the lower end of the center tube, and a locking spring threadedly connected to the center tube.
2. The heat-insulated oil pipe anti-falling device according to claim 1 is characterized in that: The piston and the cylinder sleeve are filled with normal octane.
3. The heat-insulated oil pipe anti-falling device according to claim 1 is characterized in that: The central tube is provided with an O-ring I.
4. The heat-insulated oil pipe anti-falling device according to claim 1, characterized in that: An O-ring II is arranged inside the piston, and an O-ring III is arranged outside the piston.
5. The heat-insulated oil pipe anti-falling device according to claim 1, characterized in that: The central tube is provided with an O-ring IV.