Headstall structure for oil well parameter measurement

Abstract

The utility model relates to an oil well parameter measuring tool, and particularly discloses a headstall structure for measuring oil well parameters, which comprises a shell cylinder, a central rod and a measuring head, a measuring head is arranged at the right end of the shell cylinder in a plugging manner, a center rod is inserted from the left end of the shell cylinder, a piston is sleeved on the center rod, and an elastic piece for applying rightward acting force to the piston is arranged at the left side of the piston; a shell barrel cavity section between the piston and the measuring head is an oil injection cavity, and pressure oil is filled in the oil injection cavity; a window hole is formed in the shell cylinder wall on the left side of the piston, and liquid in an oil well enters the left side of the piston through the window hole; a center hole channel is formed in the center rod, an external cable penetrates through the center hole channel and then is electrically connected with the measuring head, and the center rod is characterized in that a limiting piece capable of automatically retracting is installed on the center rod and located on the right side of the piston; and an electric push rod capable of automatically retracting and returning is also arranged on the central rod. The center rod has the advantages that the oil injection cavity is prevented from being extruded and exploded, and meanwhile the center rod can be smoothly pulled out.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well parameter measurement tools, in particular to a gooseneck structure for measuring oil well parameters. Background Art

[0002] An oil well gooseneck is a tool used to measure parameters inside an oil well during oil well exploitation, such as measuring temperature, pressure, etc. It usually includes a measuring head, which has a PLC panel and parameter sensors for measurement inside. It is necessary to electrically connect a cable to the measuring head to achieve power supply.

[0003] The design concept of the existing relatively excellent gooseneck is as follows: First, since there is liquid in the oil well, these liquids are very likely to corrode the connection between the cable and the measuring head. Therefore, through structural design, the connection between the cable and the measuring head is located inside an oil injection cavity, and oil is injected into the oil injection cavity to avoid corrosion. Second, when injecting oil into the oil injection cavity, the oil needs to meet certain hydraulic conditions, but it is very difficult to control the hydraulic pressure during injection. Therefore, it is set in the shape of a piston cavity. A piston is placed in this cavity. An elastic component is arranged on one side of the piston, and an oil injection cavity is formed between the other side of the piston and the measuring head; by the deformation amount of the elastic component, the magnitude of the hydraulic pressure injected into the oil injection cavity is known, and then the control of the hydraulic conditions is realized. When on the wellhead, the force of the spring and the pressure oil in the oil injection cavity form a force balance. When working underground, the hydraulic pressure in the oil well + the force of the spring and the pressure oil in the oil injection cavity form a force balance. Third, since there is a piston and at the same time the cable needs to be guided, a central rod is arranged at the center, and the piston is sleeved on the central rod. A central hole is opened on the central rod, and the cable is connected to the measuring head through the central hole, and the outer end of the central hole is sealed. (For auxiliary understanding, refer to the patent with the patent number 200420030299.7).

[0004] The problem existing in the above gooseneck design is that when working underground, when the hydraulic pressure in the oil well is very high, the piston may be excessively squeezed inward, resulting in the oil injection cavity being burst (usually an oil injection valve, an exhaust valve, etc. are arranged in the oil injection cavity, and O-ring seals are arranged at these valves. When the oil injection cavity is excessively squeezed, these O-ring seals will deform and fail, and finally the pressure oil in the oil injection cavity is squeezed out, and the liquid in the oil well enters the oil injection cavity, resulting in the corrosion of the connection between the cable and the measuring head).

[0005] After the above problems were reported by the customer, the initial solution idea that occurred to the inventor was to design a limiting part to prevent the piston from moving excessively. However, there were still difficult problems to solve: since there were gravels in the oil well, when the swivel was lifted after measurement, the swivel might get stuck. In this case, it was necessary to pull out the central rod, cable, etc., leaving only the outer shell and the measuring head in the well (subsequently drilled off with a drill bit). However, due to the existence of the limiting part, the limiting part got stuck at the piston, preventing the central rod from being pulled out. Summary of the Invention

[0006] The purpose of the present utility model is to overcome the shortcomings of the prior art and provide a swivel structure for measuring oil well parameters, which solves the problem that the oil injection cavity is burst due to excessive movement of the piston in some existing swivels, and also solves the problem that the limiting part does not cause obstruction when the central rod needs to be forcibly pulled out even if a limiting part is provided.

[0007] The purpose of the present utility model is achieved through the following technical solutions: a swivel structure for measuring oil well parameters, including a shell cylinder, a central rod, and a measuring head; a measuring head is hermetically arranged at the right end of the shell cylinder, the central rod is inserted from the left end of the shell cylinder, a piston is sleeved on the central rod, and an elastic member applying a rightward acting force is arranged on the left side of the piston; the shell cylinder cavity section between the piston and the measuring head is an oil injection cavity, and pressure oil is filled in the oil injection cavity; a window hole is opened on the shell cylinder wall on the left side of the piston, and the liquid in the oil well enters the left side of the piston through the window hole; a central hole is opened on the central rod, and an external cable passes through the central hole and is electrically connected to the measuring head, and its characteristics are as follows:

[0008] A retractable limiting part is installed on the central rod, and the limiting part is located on the right side of the piston; an electric push rod capable of automatically retracting and returning to its original position is also arranged on the central rod;

[0009] When the electric push rod is powered on, it can automatically extend, thereby pushing the limiting part outwards, and the pushed-out limiting part limits the piston; when the swivel is stuck and the central rod is forcibly pulled out, the cable is broken, and after the electric push rod is powered off, it can automatically retract and return to its original position, and the limiting part no longer retracts under the action of the electric push rod. At this time, the piston is no longer limited, and the central rod can be pulled out from the piston.

[0010] In some embodiments, the limiting part is a non-magnetic limiting bolt rod, and the non-magnetic limiting bolt rod penetrates along the radial direction of the central rod; a magnet block is installed at the end of the non-magnetic limiting bolt rod, and the central rod is a magnetic rod; when the non-magnetic limiting bolt rod is not affected by the electric push rod, it is adsorbed and retracted under the action of the magnet block; when the non-magnetic limiting bolt rod is affected by the electric push rod, it overcomes the magnetic force and extends.

[0011] In some embodiments, the cap head of the non-magnetic limiting bolt rod is located outside the central rod, and the small end of the non-magnetic limiting bolt rod extends into the central hole; a magnet block is fixed inside the cap head of the non-magnetic limiting bolt rod.

[0012] In some embodiments, there are multiple non-magnetic limiting bolt rods; the electric push rod is locked and fixed in the central hole, a small disc is fixed at the end of the output shaft of the electric push rod, and the small disc is connected to the conical part through multiple ejector rods; the conical surface of the conical part can abut against the end of the non-magnetic limiting bolt rod, and a through hole for the corresponding cable to pass through is opened at the center of the conical part.

[0013] In some embodiments, a central blind hole is opened in the central rod from the left end to the right, and a plurality of long waist-shaped holes are opened in the wall of the central blind hole near the left end. The central blind hole and the plurality of long waist-shaped holes together form a central hole. A torpedo joint is fixed at the left end of the central rod, and the torpedo joint is electrically connected to an external cable; the torpedo joint is also connected to a lead wire, and the lead wire passes through the central hole and is connected to the wire joint at the left end of the measuring head.

[0014] In some embodiments, a tension rod is connected between the right end of the central rod and the left end of the measuring head.

[0015] In some embodiments, an oil injection valve and an exhaust valve are provided on the inner wall of the oil injection cavity.

[0016] In some embodiments, an oil drain valve communicating with the central hole is opened on the central rod.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) A limiting member is provided on the central rod to prevent the piston from sliding excessively and prevent the oil injection cavity from being burst;

[0019] When working in the oil well, the pressure generated by the hydraulic pressure in the oil well and the elastic components together forms an equilibrium of the piston position with the pressure oil in the oil injection cavity; however, when the hydraulic pressure in the oil well is particularly large, it will cause the piston to move excessively to the right on the central rod, which will cause the pressure in the oil injection cavity to increase sharply, resulting in the oil in the oil injection cavity being squeezed out from the oil injection valve and the exhaust valve (deforming the O-ring at the corresponding valve, and the sealing at these valves fails), and the oil will be extruded through positions such as the oil injection valve and the exhaust valve. At the same time as the oil is extruded, the liquid in the oil well gradually enters the oil injection cavity. As a result, the connection between the cable and the measuring head is no longer protected by the pressure oil and is easily corroded by the liquid in the oil well;

[0020] A limiting member is provided on the central rod, and the limiting member is located on the right side of the piston; when the piston displaces excessively to the right, the piston is blocked by the limiting member and thus cannot continue to displace, avoiding the oil injection cavity from being burst.

[0021] (2) The simple and reliable telescopic movement of the limiting member enables the center rod to be smoothly pulled out when the horse headgear is jammed, avoiding the center rod from being jammed by the limiting member;

[0022] The limiting member is a non-magnetic limiting bolt rod, which is inserted radially on the center rod. When the horse headgear needs to be energized during normal operation, the non-magnetic limiting bolt rod is pushed outwards by the electric push rod at this time, and the cap head of the non-magnetic limiting bolt rod pushed out plays a role in limiting the piston;

[0023] In addition, a magnet block is embedded at the cap head of the non-magnetic limiting bolt rod, and the center rod is a magnetic conducting rod; when the horse headgear is jammed and needs to be pulled out, power is cut off. Then, the electric push rod retracts and resets automatically due to power cut-off (it is also possible to operate without power cut-off. Directly pulling the center rod outwards can break the cable, which also achieves power cut-off); the electric push rod no longer applies force to the non-magnetic limiting bolt rod. Under the action of magnetism, the non-magnetic limiting bolt rod will be adsorbed on the magnetic conducting rod, so as to retract. After the limiting member retracts, it will no longer hinder the pulling out of the center rod. Description of the Drawings

[0024] Figure 1 is a schematic structural view of the present utility model;

[0025] Figure 2 is Figure 1 the partial enlarged view in

[0026] Figure 3 is a schematic structural view of the limiting member;

[0027] Figure 4 is a schematic structural view of the electric push rod capable of self-retracting;

[0028] Figure 5 is a schematic structural view of the center rod, the piston, the elastic member, the limiting member, and the electric push rod arranged thereon;

[0029] Figure 6 is a schematic structural view of the shell cylinder;

[0030] Figure 7 is a schematic structural view of the measuring head, its connecting sleeve, and the lower protective cap;

[0031] In the figure: 10 - shell cylinder, 11 - window hole, 12 - oil injection valve, 13 - exhaust valve, 20 - center rod, 21 - central hole, 22 - oil drain valve, 23 - large diameter of the protrusion, 30 - measuring head, 40 - piston, 41 - elastic component, 50 - limiting member, 501 - non-magnetic limiting bolt rod, 502 - magnet block, 503 - nut, 60 - electric push rod, 61 - small disc, 62 - ejector rod, 63 - conical part, 70 - tension rod. Detailed implementation manners

[0032] The following further describes the present utility model in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following description.

[0033] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0035] It should be noted that in some existing relatively excellent horse heads, the piston in the oil injection cavity is not limited, and it is easy to move excessively, resulting in the oil injection valve on the oil injection cavity being squeezed and burst, the oil in the oil injection cavity being squeezed out, and at the same time the liquid in the oil well entering the oil injection cavity, resulting in corrosion at the connection between the cable and the measuring head in the oil injection cavity. Of course, it is not difficult to come up with the idea of "limiting the piston by setting a limiting component", but since the set limiting component easily affects the pulling out of the central rod, cable, etc. (when the horse head gets stuck, it is necessary to pull out the central rod and cable and leave the rest in the well, and then drill them into powder with a drill bit), many companies do not use a limiting component to limit the piston.

[0036] Therefore, the present invention provides a horse head structure for measuring oil well parameters, which can limit the piston while not affecting the pulling out of the central rod and cable.

[0037] Exemplarily, refer to Figures 1-7 , an embodiment of this specification provides a horse head structure for measuring oil well parameters, including a shell cylinder 10, a central rod 20, and a measuring head 30.

[0038] A measuring head 30 is sealingly arranged at the right end of the shell cylinder 10; the left end of the measuring head 30 extends into the shell cylinder 10, and a sealing ring is sleeved outside the measuring head 30 and is sealingly connected to the shell cylinder 10; at the left end of the measuring head 30, there is a connector for connecting a cable, the measuring head 30 itself has a PLC control panel, and at the right end of the measuring head 30, there are parameter sensors for measurement (the measuring head itself is a prior art, and it is only described in detail here for easy understanding).

[0039] A central rod 20 is inserted from the left end of the shell cylinder 10. A piston 40 is sleeved on the central rod 20. An elastic member 41 that applies a rightward acting force to the piston 40 is provided on the left side of the piston 40. The central rod 20 has a raised large diameter 23 near the left end. A keyway in the left-right direction is formed on the raised large diameter 23. A raised key in the left-right direction is provided on the inner wall of the shell cylinder 10. When the shell cylinder 10 and the central rod 20 are inserted, the keyway and the raised key are mutually adapted to form a structure that prevents the central rod from rotating. In addition, the elastic member 41 is a spring, and the spring is also sleeved on the central rod 20. One end of the spring abuts against the right end face of the raised large diameter 23, and the other end of the spring abuts against the left end face of the piston 40. This spring is a compression spring.

[0040] The cavity section of the shell cylinder 10 between the piston 40 and the measuring head 30 is an oil injection cavity, and pressure oil is filled in the oil injection cavity; an oil injection valve 12 and an exhaust valve 13 are formed on the inner wall of the oil injection cavity. Pressure oil is injected into the oil injection cavity through the oil injection valve 12, and the excess gas in the cavity is discharged through the exhaust valve 13. The pressure oil in the oil injection cavity can protect the connection between the cable and the test head 30 and prevent the connection from being corroded;

[0041] In addition, a window hole 11 is formed on the wall of the shell cylinder 10 on the left side of the piston 40. The liquid in the oil well enters the left side of the piston 40 through the window hole 11; when on the wellhead, oil is injected through the oil injection valve 12, and the pressure of the pressure oil in the oil injection cavity is greater than the pressure provided by the elastic member 41 during its deformation, so as to accurately know the amount of the injected oil. At this time, the elastic force provided by the elastic member 11 and the pressure of the pressure oil reach equilibrium; when working underground, the liquid in the oil well enters the left side of the piston 40 through the window hole 11 and applies a rightward force to the piston 40, and then the elastic member 11 also applies a rightward force to the piston 40. At this time, the two rightward forces and the pressure oil in the oil injection cavity form an equilibrium;

[0042] In addition, a central hole 21 is formed in the central rod 20. The external cable passes through the central hole 21 and is electrically connected to the measuring head 30; specifically, the central rod 20 has a central blind hole opened from the left end to the right. A plurality of oblong holes are formed on the wall of the central blind hole near the left end. The central blind hole and the plurality of oblong holes together form the central hole 21, and the central hole 21 is communicated with the oil injection cavity; a torpedo joint is fixed at the left end of the central rod 20, and the torpedo joint is electrically connected to the external cable; the torpedo joint is also connected to a lead wire. The lead wire passes through the central hole 21 and is connected to the wire joint at the left end of the measuring head 30. The right end of the central hole 21 is blocked; in addition, an oil drain valve 22 is also formed at the central blind hole.

[0043] Refer to Figure 2, a retractable limiting member 50 is installed on the central rod 20, and the limiting member 50 is located on the right side of the piston 40; an electric push rod 60 that can automatically retract and return to its original position is also provided on the central rod 20. When the electric push rod 60 is energized, it can automatically extend, thereby pushing the limiting member 50 outwards. The limiting member 50 pushed outwards limits the piston 40; when the cable head is jammed and the central rod 20 is forcibly pulled out, the cable is broken. After the electric push rod 60 is powered off, it can automatically retract and return to its original position. The limiting member 50 no longer retracts under the action of the electric push rod 60. At this time, the piston 40 is no longer limited, and the central rod 20 can be pulled out from the piston 40.

[0044] Refer to Figure 3 and Figure 4 , the structure of the limiting member 50 will be further described below.

[0045] The limiting member 50 is a non-magnetic limiting bolt rod 501. The non-magnetic limiting bolt rod 501 penetrates along the radial direction of the central rod 20. The cap head of the non-magnetic limiting bolt rod 501 is located outside the central rod 20, and the small end of the non-magnetic limiting bolt rod 501 extends into the central hole 21. The small end of the non-magnetic limiting bolt rod 501 near the end is a threaded section, and the rest of the non-magnetic limiting bolt rod 501 is a smooth rod. By screwing a nut 503 on the threaded section, the non-magnetic limiting bolt rod 501 is prevented from falling off;

[0046] Moreover, a recessed hole is opened at the cap head of the non-magnetic limiting bolt rod 501. A magnet block 502 is installed in the recessed hole and locked with a locking screw after installation; in addition, the central rod 20 is a magnetic rod;

[0047] During operation, when the non-magnetic limiting bolt rod 501 is not affected by the electric push rod 60, it is adsorbed and retracted under the action of the magnet block 502; when the non-magnetic limiting bolt rod 501 is affected by the electric push rod 60, it overcomes the magnetic force and extends.

[0048] Preferably, there are multiple non-magnetic limiting bolt rods 501.

[0049] Refer to Figure 4 , the structure of the electric push rod 60 will be further described below.

[0050] The electric push rod 60 is locked and fixed in the central hole 21. A small disc 61 is fixed at the end of the output shaft of the electric push rod 60. The small disc 61 is connected to a conical member 63 through multiple ejector rods 62; the conical surface of the conical member 63 can abut against the end of the non-magnetic limiting bolt rod 501, and a through hole for the corresponding cable to pass through is opened at the center of the conical member 63;

[0051] In addition, the electric push rod 60 itself is selected as a push rod that can automatically retract and return to its original position. It will retract when powered off and can extend when powered on. It is an existing push rod available on the market.

[0052] Optionally, refer to Figure 1 , a tension rod 70 is connected between the right end of the central rod 20 and the left end of the measuring head 30.

[0053] The above embodiments only express relatively preferred implementation manners, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the utility model.

Claims

1. A swivel structure for measuring oil well parameters, comprising a shell cylinder (10), a central rod (20), and a measuring head (30); the measuring head (30) is sealingly arranged at the right end of the shell cylinder (10), the central rod (20) is inserted from the left end of the shell cylinder (10), a piston (40) is sleeved on the central rod (20), and an elastic member (41) applying a rightward acting force to the piston (40) is arranged on the left side of the piston (40); the cavity section of the shell cylinder (10) between the piston (40) and the measuring head (30) is an oil injection cavity, and pressure oil is filled in the oil injection cavity; a central hole (21) is formed on the central rod (20), and an external cable passes through the central hole (21) and is electrically connected to the measuring head (30), and it is characterized in that: A limiting member (50) capable of automatically retracting is installed on the central rod (20), and the limiting member (50) is located on the right side of the piston (40); an electric push rod (60) capable of automatically retracting and returning to its original position is further arranged on the central rod (20); When the electric push rod (60) is powered on, it can automatically extend, thereby pushing the limiting member (50) outwards, and the pushed-out limiting member (50) limits the piston (40); when the swivel is jammed and the central rod (20) is forcibly pulled out, the cable is broken, and after the electric push rod (60) is powered off, it can automatically retract and return to its original position, and the limiting member (50) no longer retracts under the action of the electric push rod (60). At this time, the piston (40) is no longer limited, and the central rod (20) can be pulled out from the piston (40).

2. The swivel structure for measuring oil well parameters according to claim 1, characterized in that: The limiting member (50) is a non-magnetic limiting bolt rod (501), and the non-magnetic limiting bolt rod (501) is arranged radially through the central rod (20); A magnet block (502) is installed at the end of the non-magnetic limiting bolt rod (501), and the central rod (20) is a magnetic rod; when the non-magnetic limiting bolt rod (501) is not under the action of the electric push rod (60), it adsorbs and retracts under the action of the magnet block (502); when the non-magnetic limiting bolt rod (501) is under the action of the electric push rod (60), it overcomes the magnetic force and extends.

3. The pony head structure for measuring oil well parameters according to claim 2, characterized in that: The cap head of the non-magnetic limiting bolt rod (501) is located outside the central rod (20), and the small end of the non-magnetic limiting bolt rod (501) extends into the central hole (21); A magnet block (502) is fixed in the cap head of the non-magnetic limiting bolt rod (501).

4. The ponyhead structure for measuring oil well parameters according to claim 2 or 3, characterized in that: The number of the non-magnetic limiting bolt rods (501) is multiple; The electric push rod (60) is locked and fixed in the central hole (21), a small disc (61) is fixed at the end of the output shaft of the electric push rod (60), and the small disc (61) is connected to a conical member (63) through a plurality of ejector rods (62); the conical surface of the conical member (63) can abut against the end of the non-magnetic limiting bolt rod (501), and a through hole for passing the corresponding cable is formed at the center of the conical member (63).

5. The swivel structure for measuring oil well parameters according to claim 1, characterized in that: The central rod (20) is provided with a central blind hole from the left end to the right, and a plurality of long waist-shaped holes are formed in the wall of the central blind hole near the left end. The central blind hole and the plurality of long waist-shaped holes together form the central hole. A torpedo connector is fixed at the left end of the central rod (20), and the torpedo connector is electrically connected to an external cable; the torpedo connector is also connected to a lead wire, and the lead wire passes through the central hole (21) and is connected to a wire connector at the left end of the measuring head (30).

6. The pony head structure for measuring oil well parameters according to claim 1, characterized in that: A tension rod (70) is connected between the right end of the central rod (20) and the left end of the measuring head (30).

7. The swivel structure for measuring oil well parameters according to claim 1, characterized in that: An oil injection valve (12) and an exhaust valve (13) are provided on the inner wall of the oil injection cavity.

8. The ponyhead structure for measuring oil well parameters according to claim 1, characterized in that: An oil drain valve (22) communicating with the central hole (21) is provided on the central rod (20).

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