Adjustable choke tube
By using sealing rods, grease injection joints and overflow joints in the flow blocking pipe, combined with multiple extrusion technology of threaded heads and locking nuts, the problem of degradation of sealing effect caused by wear of the inner holes of the flow blocking pipe is solved, and a higher sealing effect and a longer service life are achieved.
Patent Information
- Application Number
- CN202421715339.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-19
AI Technical Summary
After a long time of use, the internal hole wears larger, resulting in the gap between the internal hole and the cable becoming larger, and the preset current blocking and pressure reduction effect cannot be achieved, making it easy to cause blowout accidents.
An adjustable flow blocking tube is designed, using a sealing glue rod, grease injection joint and overflow joint to inject the sealing grease into the gap between the cable and the inner hole of the connecting tube. The sealing glue rod is squeezed multiple times through the threaded head and locking nut to improve the sealing effect.
It improves the sealing effect of the current blocking pipe, extends the use time and times, reduces the wear of the cable, reduces the cost of use, makes the operation simple and fast, is easy to maintain, and reduces environmental pollution.
Smart Images
Figure CN222863358U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil production testing, in particular to an adjustable choke tube. Background Art
[0002] The function of the choke tube is to balance the wellhead pressure during oil production testing. The pressure control device allows pressure to exist in the well while allowing the cable to move freely. The sealing grease is injected into the annular space between the cable and the inner hole of the choke tube. Since the clearance between the inner diameter of the choke tube and the outer diameter of the cable is very small, when the sealing grease injected from the grease injection line squeezes into the gap between the cable and the choke tube, a large pressure difference will be formed. In this way, the viscous sealing grease allows the choke tube to be sealed under well pressure.
[0003] After long-term use, the inner hole of the existing "integrated steel structure" choke tube wears out and becomes larger; the gap between the inner hole and the cable becomes larger, and the preset choke and pressure reduction effect cannot be achieved, which is prone to blowout accidents. At this time, the work must be stopped and the entire blowout preventer must be replaced, which is cumbersome, labor-intensive, and costly. Utility Model Content
[0004] The utility model aims to provide an adjustable choke tube to solve the problem in the background art that after long-term use of the choke tube, the gap between the inner hole and the cable becomes larger, the preset choke and pressure reduction effect cannot be achieved, and blowout accidents are prone to occur.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] An adjustable choke tube comprises a tube body, the tube body comprises a connecting tube, a sealing rubber stick is clamped and connected inside the connecting tube, a sealing chamber is threadedly connected to the outer surface of the upper end of the connecting tube, and an intermediate joint is threadedly connected to the outer surface of the lower end of the connecting tube;
[0007] The cable passes through the sealing chamber, the sealing glue stick and the middle joint in sequence and is connected with them in a clamping manner. An instrument is fixedly connected to the outer surface of the lower end of the cable.
[0008] The outer surface of the intermediate joint is provided with a grease injection port joint, and the outer surface of the sealing chamber is provided with an overflow port joint. The grease injection port joint and the overflow port joint are both in contact with the cable, and sealing grease can be poured in from the grease injection port joint and flow out from the overflow port joint.
[0009] Preferably, the connecting pipe is further provided with a threaded head, and a locking nut is threadedly connected on the outer surface of the threaded head.
[0010] Preferably, the threaded head is threadedly connected to the inner side of one end of the connecting pipe.
[0011] Preferably, the tube body includes three groups of connecting tubes, each of the connecting tubes is connected by the threaded head, the sealing chamber is located at the upper end of the upper connecting tube, and the middle joint is located at the lower end of the lower connecting tube.
[0012] Preferably, an expansion mechanism is provided above the sealing chamber, and the expansion mechanism comprises a guide port, and the guide port is fixedly connected to the upper surface of the sealing chamber.
[0013] Preferably, the guide opening is trumpet-shaped, and the cable passes through the guide opening.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] The adjustable choke tube provided by the utility model can inject thick sealing grease into the annular space between the cable and the inner hole of the connecting tube through the sealing glue stick, the grease injection port joint and the overflow port joint. Since the matching clearance between the inner diameter of the connecting tube and the outer diameter of the cable is very small, a large pressure difference is formed when the sealing grease injected from the grease injection pipeline is squeezed into the gap between the cable and the choke tube. The thick sealing grease enables the choke tube to be sealed under well pressure, thereby improving the sealing effect.
[0016] Furthermore, the sealing effect is improved by squeezing the sealant stick multiple times through the threaded head and the locking nut, thereby increasing the use time and frequency of the choke tube and reducing the wear on the cable; the choke tube greatly reduces the use cost, makes the operation simple and fast, is easy to maintain, and shortens the field construction operation time. In addition, the upper guide port facilitates the cable to align with the inner hole of the choke tube, and the trumpet-shaped opening can collect excess grease dripping from the cable when the cable is lifted to prevent environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable choke tube in a specific embodiment of the utility model;
[0019] Figure 2 for Figure 1 A schematic diagram of a three-dimensional structure of a partially cutaway view of a middle adjustable choke tube;
[0020] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;
[0021] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at point B in the middle.
[0022] In the figure: 1. connecting pipe; 11. sealing chamber; 12. cable; 13. intermediate joint; 14. instrument; 2. threaded head; 21. sealing glue stick; 22. locking nut; 23. guide port; 3. grease injection port joint; 31. overflow port joint. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] See also Figure 1-4 , Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable choke tube in a specific embodiment of the utility model; Figure 2 for Figure 1 A schematic diagram of a three-dimensional structure of a partially cutaway view of a middle adjustable choke tube; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 for Figure 2 Schematic diagram of the enlarged structure at point B in the middle.
[0025] An adjustable choke tube comprises: a tube body, which comprises a connecting tube 1, a cavity is provided in the connecting tube 1, a sealing glue stick 21 is snap-connected in the cavity, a sealing chamber 11 is threadedly connected to the outer surface of the upper end of the connecting tube 1, and an intermediate joint 13 is threadedly connected to the outer surface of the lower end of the connecting tube 1.
[0026] The cable 12 passes through the sealing chamber 11 , the sealing glue stick 21 and the middle joint 13 in sequence and is connected with them in a clamping manner. An instrument 14 is fixedly connected to the outer surface of the lower end of the cable 12 .
[0027] The outer surface of the intermediate joint 13 is provided with a grease injection port joint 3, and the outer surface of the sealing chamber 11 is provided with an overflow port joint 31. The inner ends of the grease injection port joint 3 and the overflow port joint 31 are both in contact with the cable 12, and the sealing grease can be poured in from the grease injection port joint 3 and flow out from the overflow port joint 31.
[0028] When in use, since the grease injection port joint 3 is connected to the bottom of the cable 12 through the middle joint 13, and the overflow port joint 31 is connected to the top of the cable 12 through the sealing chamber 11, pouring sealing grease between the cable 12 and the sealing glue stick through the grease injection port joint 3 will make the sealing glue stick 21 and the cable 12 tighter, and the sealing grease will fully fill the gap between the cable 12 and the sealing glue stick 21 to achieve a sealing effect. At the same time, the excess sealing grease poured into the grease injection port joint 3 will flow out on the overflow port joint 31.
[0029] Furthermore, a threaded head 2 may be provided on the connecting tube 1, and a locking nut 22 may be threadedly connected on the outer surface of the threaded head 2, and the threaded head 2 may be threadedly connected to the inner side of one end of the connecting tube 1. A sealing glue stick 21 is provided in the cavity inside the connecting tube 1, and the threaded head 2 is rotated on the threaded hole inside the connecting tube 1 to squeeze the sealing glue stick 21, so that the circular hole on the surface of the sealing glue stick 21 becomes smaller, so as to better fit the outer surface of the cable 12, and then the connection between the sealing glue stick 21 and the connecting tube 1 is locked by the locking nut 22, thereby squeezing the sealing glue stick 21 multiple times, and the sealing effect is significantly improved.
[0030] Furthermore, the connecting tubes 1 can be provided in multiple groups, such as three groups, as needed, and the connecting tubes 1 can be threadedly connected through the threaded heads 2. Since a circular hole is provided on the threaded head 2 and a circular hole is provided on the inner surface of the sealing glue stick 21, the cable 12 shell simultaneously passes through the threaded head 2 and the sealing glue stick 21. Specifically, the outer ends of the threaded heads 2 on one group of connecting tubes 1 can be rotated on the threaded holes on the inner surface of another group of connecting tubes 1, thereby forming a connection, and then the locking nut 22 is rotated and twisted to make one group of connecting tubes 1 abut against and connect to the other group of connecting tubes 1. At this time, the sealing chamber 11 is located at the upper end of the upper connecting tube 1, and the intermediate joint 13 is located at the lower end of the lower connecting tube 1.
[0031] In the above case, the sealing stick 21 in one group of connecting tubes 1 is connected to the other group of connecting tubes 1 under the rotation of the threaded head 2. At this time, the circular hole of the sealing stick 21 becomes smaller, and the locking nut 22 is further rotated to lock its position. After repeated use, the wear of the sealing stick 21 becomes larger. When the sealing effect does not meet the requirements, the sealing stick 21 inside the connecting tube 1 can be replaced.
[0032] In addition, an expansion mechanism may be provided on the surface of the sealed chamber 11, the expansion mechanism comprising a guide port 23, the guide port 23 is fixedly connected to the surface of the sealed chamber 11, and the opening of the guide port 23 is upward. Further, the guide port 23 is trumpet-shaped, the cable 12 passes through the guide port 23, and the guide port 23 can collect excess grease dripping from the cable 12 to prevent environmental pollution.
[0033] The working principle of the above-mentioned adjustable choke tube is as follows:
[0034] First, a sealing glue stick 21 is placed on the cavity inside the connecting tube 1, and the sealing glue stick 21 is squeezed by rotating the threaded head 2 in the threaded hole in the connecting tube 1, so that the circular hole on the surface of the sealing glue stick 21 becomes smaller, so as to better fit the outer surface of the cable 12;
[0035] The connection between the sealing glue stick 21 and the connecting tube 1 is locked by the locking nut 22, and the sealing glue stick 21 is squeezed for a second time. During long-term use, the sealing glue stick 21 can be rotated in the connecting tube 1 to improve the squeezing effect of the sealing glue stick 21, thereby improving the sealing degree.
[0036] When the sealing effect is still not good, the sealing glue stick 21 can be taken out from the connecting tube 1 for replacement. At this time, the guide port 23 on the sealing chamber 11 can collect excess grease dripping from the cable 12, and then inject sealing grease into the grease injection port joint 3. The sealing grease continuously fills the gap between the cable 12 and the sealing glue stick 21, and the excess sealing grease will flow out from the overflow port joint 31, thereby improving the sealing performance.
[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. An adjustable choke tube, characterized in that: The pipe body comprises a connecting pipe (1), a sealing glue stick (21) is snap-fitted into the connecting pipe (1), a sealing chamber (11) is threadedly connected to the outer surface of the upper end of the connecting pipe (1), and an intermediate joint (13) is threadedly connected to the outer surface of the lower end of the connecting pipe (1); The cable (12) sequentially passes through the sealing chamber (11), the sealing glue stick (21) and the intermediate joint (13) and is connected to them in a snap-fitting manner. The outer surface of the lower end of the cable (12) is fixedly connected to an instrument (14). The outer surface of the intermediate joint (13) is provided with a grease injection port joint (3), and the outer surface of the sealing chamber (11) is provided with an overflow port joint (31). Both the grease injection port joint (3) and the overflow port joint (31) are in contact with the cable (12), and sealing grease can be poured in from the grease injection port joint (3) and flow out from the overflow port joint (31).
2. The adjustable choke tube according to claim 1, characterized in that: The connecting pipe (1) is also provided with a threaded head (2), and a locking nut (22) is threadedly connected on the outer surface of the threaded head (2).
3. The adjustable choke tube according to claim 2, characterized in that: The threaded head (2) is threadedly connected to the inner side of one end of the connecting pipe (1).
4. The adjustable choke tube according to claim 3, characterized in that: The tube body comprises three groups of connecting tubes (1), each of the connecting tubes (1) being connected via the threaded head (2), the sealing chamber (11) being located at the upper end of the upper connecting tube (1), and the middle joint (13) being located at the lower end of the lower connecting tube (1).
5. The adjustable choke tube according to claim 1, characterized in that: An expansion mechanism is provided above the sealing chamber (11), the expansion mechanism comprising a guide opening (23), the guide opening (23) being fixedly connected to the upper surface of the sealing chamber (11).
6. The adjustable choke tube according to claim 5, characterized in that: The guide opening (23) is in a trumpet shape, and the cable (12) passes through the guide opening (23).