Crude oil moisture content detection device

Abstract

The utility model provides a device for detecting the moisture content of crude oil, and belongs to the technical field of in-well liquid testing equipment. The crude oil moisture content detection device comprises a measuring tube, the measuring tube is provided with a measuring cavity and a penetrating channel, the penetrating channel is provided with a sealing structure matched with a measuring rod in a sealing mode, the penetrating channel is further provided with a valve, and the valve comprises a valve body, a valve element arranged in the valve body and a control mechanism for controlling the valve element to act. The valve element or the valve body is provided with a through hole for the probe to penetrate through, the valve is opened in the action stroke of the valve element so that the probe can penetrate through the through hole and stretch into the measuring cavity, and the valve is closed in the action stroke of the valve element so that the water content measuring instrument can be detachable after the probe retreats from the measuring cavity and the through hole. After the water content measuring instrument is adopted, when detection is not needed, the water content measuring instrument can be detached and does not need to be fixedly connected to the measuring pipe all the time, so that the configuration cost can be reduced, and meanwhile, overhaul and maintenance can be conveniently realized under the condition that the production efficiency is not influenced.

Description

Technical Field

[0001] The utility model relates to a crude oil water content detection device, belonging to the technical field of well liquid testing equipment. Background Art

[0002] The water content of crude oil is an important indicator for oil well production management and evaluation. By measuring the water content and analyzing its changing trend, we can timely grasp the production dynamics of the oil well, estimate the output and predict the development life, which is of great significance for the scientific implementation of reservoir development measures and improving crude oil recovery.

[0003] The measurement of the water content of crude oil requires the use of a detection device, such as a Chinese invention patent application with application publication number CN114893170A, which discloses an online detection device and method for the water content of a wellhead liquid, wherein the online detection device includes an inlet pipe, a measuring chamber, an outlet pipe and a water content measuring instrument, the water content measuring instrument is arranged on the measuring chamber, the inlet pipe and the outlet pipe are respectively connected to the measuring chamber, and the inlet pipe is connected to the wellhead Christmas tree through a connecting flange, and the outlet pipe is connected to the external device pipe through a connecting flange. During the detection, the mixed fluid produced by the wellhead Christmas tree enters the measuring chamber through the inlet pipe, the measuring chamber can separate the gas and liquid of the mixed fluid, and the water content measuring instrument performs real-time detection of the water content and temperature of the liquid in the mixed fluid.

[0004] The water content measuring instrument in the above-mentioned measuring device is fixed on the measuring chamber and is an indispensable part of the entire measuring device. The entire measuring device is a fixed device at the wellhead, and each measuring device needs to be equipped with a water content measuring instrument. The water content detection is phased and does not need to be detected all the time. This leads to a relatively high configuration cost of the measuring device at each wellhead, and when the water content measuring instrument needs to be overhauled and maintained, the well must be stopped to remove the water content measuring instrument. Production can only be continued after the water content measuring instrument is overhauled and maintained and reinstalled, which affects production efficiency. Utility Model Content

[0005] The utility model aims to provide a crude oil water content detection device to solve the problem that the water content measuring instrument in the prior art can only be fixed at the wellhead as an indispensable part of the measuring device, resulting in high configuration cost and the well must be stopped for inspection and maintenance, which affects the production efficiency.

[0006] In order to achieve the above purpose, the crude oil water content detection device in the utility model adopts the following technical scheme:

[0007] A crude oil water content detection device comprises a measuring tube for installation on a wellhead process, the measuring tube having a measuring cavity and a passing channel for a measuring rod of a water content measuring instrument to pass through so that a probe at the end of the measuring rod can extend into the measuring cavity, a sealing structure for sealingly cooperating with the measuring rod is arranged on the passing channel, a valve is also arranged on the passing channel, the valve comprises a valve body, a valve core arranged in the valve body and a control mechanism for controlling the movement of the valve core, the valve core or the valve body has a through hole for the probe to pass through, the valve core has an open state in the movement stroke in which the valve is opened to allow the probe to pass through the through hole and extend into the measuring cavity, and also has a closed state in which the valve is closed after the probe exits the measuring cavity and the through hole so that the water content measuring instrument can be detached.

[0008] The beneficial effect of the above technical solution is that: the utility model belongs to an improved invention, and the improvement is that a valve is installed on the through channel and a sealing structure is provided. Since the valve body or the valve core has a through hole for the probe to pass through, and the valve core has an open state and a closed state in its action stroke, when the valve core is in the open state, the probe can pass through the through hole and extend into the measuring cavity to detect the water content of the crude oil. During the detection process, the sealing structure cooperates with the measuring rod to ensure the sealing to prevent liquid from leaking from the through channel; when the probe withdraws from the measuring cavity and the through hole, the valve core can be switched to a closed state, thereby blocking the through channel to prevent liquid from leaking from the valve.

[0009] Therefore, when the crude oil water content detection device of the utility model is used, the valve core is switched to the open state only when the crude oil water content needs to be detected, so that the probe can pass through the through hole and extend into the measuring cavity to realize detection. When detection is not needed, the probe only needs to be withdrawn from the measuring cavity and the through hole on the valve core, and then the valve core is switched to the closed state. That is, the water content measuring instrument can be removed and does not need to be fixed to the measuring pipe all the time. Therefore, one water content measuring instrument can detect multiple wells, thereby reducing the configuration cost. At the same time, after the water content measuring instrument is removed, it can be easily repaired and maintained, and the valve core in the closed state does not affect the normal operation of the wellhead process, greatly reducing the impact on production efficiency.

[0010] Furthermore, the measuring tube includes a vertically arranged lower connecting tube, the lower end of which is connected to the valve body, the upper end of which is connected to a lower joint, a through hole for the measuring rod to pass through is provided on the lower joint, and the sealing structure is a sealing ring installed in the through hole and used for contacting and sealing with the light rod section of the measuring rod.

[0011] Furthermore, the measuring tube also includes an upper connecting tube arranged vertically and for the measuring rod to pass through, the lower end of the upper connecting tube is connected to the lower joint, the upper end of the upper connecting tube is connected to the upper joint, and the upper joint is provided with a threaded hole for threaded cooperation with the screw segment of the measuring rod.

[0012] Furthermore, the crude oil water content detection device also includes a locking nut that is sleeved on the outside of the measuring rod and cooperates with the measuring rod in the axial direction. The locking nut is used to be threadedly assembled on the upper joint after the screw section of the measuring rod and the upper joint are assembled in place.

[0013] Furthermore, the lower joint is detachably connected to the lower connecting pipe, and the crude oil water content detection device also includes a plug detachably connected to the upper end of the lower connecting pipe when the valve core is in a closed state and the water content measuring instrument and the lower joint are removed.

[0014] Furthermore, a vent valve is installed on the lower connecting pipe.

[0015] Furthermore, the measuring tube also includes a horizontal tube and a vertical tube vertically connected to the horizontal tube, and both ends of the horizontal tube are respectively provided with connection structures for fixed connection with the wellhead process, the inner cavity of the horizontal tube or the inner cavity of the horizontal tube and the vertical tube constitute the measuring cavity, and the valve body is connected between the vertical tube and the lower connecting pipe.

[0016] Furthermore, the valve is a ball valve, and the valve core is a sphere.

[0017] Furthermore, the lower connecting pipe and the valve body, the lower connecting pipe and the lower joint, the upper connecting pipe and the lower joint, and the upper connecting pipe and the upper joint are all connected by threaded fittings.

[0018] Furthermore, the vertical pipe and the valve body are connected by threaded fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an embodiment of a crude oil water content detection device in the utility model (the valve is open and the probe of the water content measuring instrument is extended into the measuring cavity);

[0020] Figure 2 This is a structural diagram of an embodiment of a crude oil water content detection device in the utility model (the valve is closed and the probe of the water content measuring instrument does not extend into the measuring cavity).

[0021] In the figure: 1. Water content measuring instrument; 101. Instrument head; 102. Stop section; 103. Screw section; 104. Bare rod section; 105. Probe; 2. Locking nut; 3. Upper joint; 4. Upper connecting pipe; 5. Lower joint; 501. Mounting groove; 6. Lower connecting pipe; 7. Valve; 701. Valve body; 702. Ball; 703. Handle; 8. Vertical pipe; 9. Connecting flange; 10. Horizontal pipe; 11. Sealing ring; 12. Vent valve. DETAILED DESCRIPTION

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] In view of the technical problems existing in the prior art, the basic technical concept of the utility model is to arrange a valve on the through channel of the detection device, and the valve body or valve core has a through hole for the probe of the water content measuring instrument to pass through. When detection is required, the valve is opened to allow the probe of the water content measuring instrument to pass through the through hole and extend into the measuring cavity. At the same time, the measuring rod is sealed by the sealing structure on the through channel to ensure that the probe can normally detect the water content of crude oil; when detection is not required, the probe is withdrawn from the measuring cavity and the valve core, and then the valve is closed, and the water content measuring instrument can be removed without being fixed to the wellhead all the time, thereby reducing the configuration cost and facilitating inspection and maintenance without affecting production efficiency.

[0024] Embodiment 1 of the crude oil water content detection device of the utility model:

[0025] like Figure 1 As shown, the crude oil water content detection device includes a measuring tube for installation on the wellhead process, and the measuring tube has a measuring cavity and a through passage for the measuring rod of the water content measuring instrument 1 to pass through so that the probe 105 at the end of the measuring rod can extend into the measuring cavity. In this embodiment, the measuring tube includes a transverse tube 10, and the inner cavity of the transverse tube 10 constitutes the above-mentioned measuring cavity. Both ends of the transverse tube 10 are respectively provided with connecting structures for fixed connection with the wellhead process. In this embodiment, the above-mentioned connecting structure is a connecting flange 9, and both ends of the transverse tube 10 are respectively provided with external threads, and the inner hole of the connecting flange 9 is provided with internal threads. The connecting flange 9 is threadedly assembled at the end of the transverse tube 10, which is convenient for processing, manufacturing and assembly.

[0026] like Figure 1 As shown, the measuring tube also includes a vertical tube 8 vertically connected to the horizontal tube 10, specifically, a hole is opened just above the middle of the horizontal tube 10, wherein one end of the vertical tube 8 is provided with an external thread, and the other end is not provided, and the non-threaded end of the vertical tube 8 is welded to the hole position of the horizontal tube 10 to achieve fixation and communication between the vertical tube 8 and the horizontal tube 10. In actual use, since the vertical tube 8 is used for the measuring rod of the water content measuring instrument 1 to pass through so that the probe 105 can extend into the measuring cavity, the vertical tube 8 constitutes a part of the above-mentioned through channel.

[0027] The through passage is provided with a valve 7, which includes a valve body 701, a valve core provided in the valve body 701, and a control mechanism for controlling the movement of the valve core. The valve body 701 is arranged vertically, and its lower end is fixedly connected to the vertical pipe 8. Specifically, the upper and lower ports of the valve body 701 are both provided with internal threads, and the lower port of the valve body 701 is threadedly assembled with the vertical pipe 8. The valve 7 in this embodiment is a ball valve, so the valve core is the ball 702, and the ball valve is a manually controlled ball valve, so the control mechanism includes a handle 703 that is in transmission cooperation with the ball 702, and the rotation of the ball 702 can be controlled by rotating the handle 703. As is known, the ball valve is a prior art, and the ball 702 itself has a through hole, the size of which is just adapted to the size of the measuring rod of the water content measuring instrument 1, so that the probe 105 can pass through, and thus the ball 702 has an open state in the movement stroke in which the valve 7 is opened to allow the probe 105 to pass through the through hole and extend into the measuring cavity, and also has a closed state in which the valve 7 is closed after the probe 105 exits the measuring cavity and the through hole to make the water content measuring instrument 1 detachable.

[0028] like Figure 1 As shown, the water content measuring instrument 1 includes an instrument head 101 and the above-mentioned measuring rod, and the measuring rod includes a probe 105, a polished rod section 104, a screw section 103 and a stop section 102 from bottom to top. When the ball 702 is in an open state, the probe 105 passes through the ball 702 and extends into the measuring cavity. At this time, the through hole on the ball 702 is also for the polished rod section 104 to pass through. In order to ensure the sealing during detection, a sealing structure for sealing with the polished rod section 104 is also provided on the through channel. Specifically, the measuring tube also includes a vertically arranged lower connecting pipe 6, and the lower end of the lower connecting pipe 6 is connected to the valve body 701. Specifically, an external thread is provided at the lower end of the lower connecting pipe 6, so that the lower connecting pipe 6 is directly threadedly assembled with the upper port of the valve body 701. The upper end of the lower connecting pipe 6 is connected to the lower joint 5, and specifically, an internal thread is provided at the upper end of the lower connecting pipe 6, and an external thread is provided at the middle and lower part of the lower joint 5, and the two are directly threadedly assembled. The lower joint 5 is provided with a through hole for the measuring rod to pass through, specifically for the polished rod section 104 and the probe 105 to pass through, and a mounting groove 501 is provided on the hole wall of the through hole, and a sealing ring 11 is installed in the mounting groove 501. The sealing ring 11 is used to contact the outer peripheral surface of the polished rod section 104 to achieve sealing between the measuring rod and the through channel to prevent crude oil from leaking therefrom. Furthermore, the above-mentioned mounting groove 501 is provided with two rows, and then a better sealing effect is achieved through the two rows of sealing rings 11.

[0029] The measuring tube also includes an upper connecting tube 4 arranged vertically and for the measuring rod to pass through, and the lower end of the upper connecting tube 4 is connected to the lower joint 5, specifically, an internal thread is provided at the lower end of the upper connecting tube 4, and an external thread is provided at the upper end of the lower joint 5, and the two are directly threadedly assembled. So far, since the upper connecting tube 4, the lower joint 5, and the lower connecting tube 6 are all for the measuring rod to pass through, they also constitute a part of the passing channel, and the valve body 701 is connected between the vertical pipe 8 and the lower connecting tube 6, and the inner cavity of the valve body 701 and the ball 702 are also for the measuring rod to pass through, so the valve 7 also constitutes a part of the passing channel.

[0030] The upper end of the upper connecting tube 4 is connected to the upper joint 3, and the upper and lower ends of the upper joint 3 are respectively provided with external threads, and the upper end of the upper connecting tube 4 is provided with internal threads, and the upper joint 3 is threadedly assembled on the upper end of the upper connecting tube 4. At the same time, the upper joint 3 is processed with internal threads that are threadedly connected with the screw segment 103 of the measuring rod, and the internal threads and the external threads on the screw segment 103 are both trapezoidal threads. When installing the water content measuring instrument 1, the screw segment 103 is threadedly matched with the upper joint 3, and the water content measuring instrument 1 can be moved downward by rotating it, so that the probe 105 passes through the sphere 702 and extends into the measuring cavity. This installation method can more easily overcome the upward thrust generated by the crude oil pressure on the water content measuring instrument 1, making the installation more labor-saving.

[0031] The crude oil water content detection device also includes a locking nut 2 for being sleeved on the outside of the measuring rod and cooperating with the measuring rod in the axial direction. The locking nut 2 includes a sleeve body and an end cap located at one end of the sleeve body. The inner hole of the sleeve body is provided with an internal thread, and the end cap is provided with a through hole for the measuring rod to pass through. Two protrusions are arranged radially at intervals on the outer peripheral surface of the above-mentioned stop section 102, and two avoidance grooves are arranged on the hole wall of the end cap through hole. The size of the avoidance groove is slightly larger than the size of the protrusion. When installing, align the avoidance groove with the protrusion so that the end cap can pass over the two protrusions, and then rotate the locking nut 2 at a certain angle, and the end cap can be hung on the stop section 102. During installation, as the measuring rod continues to move downward, when the screw section 103 of the measuring rod is assembled with the upper joint 3, the locking nut 2 is threadedly connected with the upper joint 3. In this way, during the detection process, even if the measuring rod is rotated in the opposite direction, the protrusion will cooperate with the locking nut 2 to prevent the measuring rod from rotating and moving upward, thereby ensuring that the measurement work is carried out normally. Only after the measurement is completed, the locking nut 2 is removed from the upper joint 3 first, and then the water content measuring instrument 1 can be disassembled.

[0032] like Figure 1As shown, a vent valve 12 is installed on the lower connecting pipe 6, and the vent valve 12 can release the pressure in the lower connecting pipe 6 when the valve 7 is closed and the measuring rod has not exited the lower joint 5. In addition, the crude oil water content detection device also includes a plug (not shown in the figure) that can be detachably connected to the upper end of the lower connecting pipe 6 after the ball 702 is in a closed state and the water content measuring instrument 1 and the lower joint 5 are removed. The specific connection method is that an external thread is provided on the plug, which can be directly connected with the internal thread on the upper end of the lower connecting pipe 6.

[0033] The working process of the crude oil water content detection device in the utility model is as follows:

[0034] First, the horizontal pipe 10 is directly fixed and connected to the wellhead process through the connecting flanges 9 at both ends without disassembly. The lower end of the valve body 701 is fixed to the vertical pipe 8, and the upper end is installed with the lower connecting pipe 6. When not testing, the valve 7 is closed, and the upper end of the lower connecting pipe 6 is not installed with the lower joint 5 (of course, the upper connecting pipe 4, the upper joint 3, the water content measuring instrument 1 and the locking nut 2 and other components are not installed), but a plug is installed to block the upper end of the lower connecting pipe 6 to prevent impurities from entering the lower connecting pipe 6, forming a fixed process structure that can be used for crude oil water content detection at any time.

[0035] When testing is required, remove the plug, install the lower joint 5 on the lower connecting tube 6, then install the upper connecting tube 4 on the lower joint 5, and then install the upper joint 3 on the upper connecting tube 4 to form a testing channel for installing the measuring rod of the water content measuring instrument 1. Then put the locking nut 2 on the outside of the measuring rod of the water content measuring instrument 1, so that the end cover of the locking nut 2 passes over the two protrusions on the stop section 102 of the measuring rod, and rotate the locking nut 2 a certain angle to prevent it from falling. Then insert the probe 105 of the measuring rod downward into the testing channel. When the screw section 103 of the measuring rod engages with the internal thread of the upper joint 3, rotate the water content measuring instrument 1 clockwise and the measuring rod moves downward until the probe 105 of the measuring rod moves to above the sphere 702 (such as Figure 2 As shown in the figure, when the valve 7 is opened, the oil and gas in the oil well will go up through the ball 702, but the oil and gas cannot escape because the sealing ring 11 is in sealing cooperation with the light rod section 104 of the measuring rod. Then continue to rotate the water content measuring instrument 1, so that the probe 105 passes through the ball 702 and the vertical pipe 8 and extends into the horizontal pipe 10, fully contacting the oil and gas at the outlet of the oil well, and finally connect the locking nut 2 with the upper joint 3, so that online detection can be achieved for a period of time.

[0036] When disassembly is required, loosen the locking nut 2, rotate the water content measuring instrument 1 counterclockwise, and move the measuring rod upward until the probe 105 just withdraws above the sphere 702, then stop rotating the water content measuring instrument 1, close the valve 7, open the vent valve 12, and release the residual pressure in the annulus between the lower connecting pipe 6 and the measuring rod. Then continue to rotate the water content measuring instrument 1 counterclockwise until the screw section 103 is completely screwed out of the upper joint 3, directly lift the water content measuring instrument 1 upward, and then remove the upper joint 3, the upper connecting pipe 4, and the lower joint 5 in turn, and finally install a plug at the upper end of the lower connecting pipe 6 to complete the detection.

[0037] In summary, the crude oil water content detection device of the utility model is used. When measurement is required, the water content measuring instrument 1 is installed, and when detection is not required, the water content measuring instrument 1 can be removed. The water content measuring instrument 1 does not need to be fixed to the measuring tube all the time, so one water content measuring instrument 1 can detect multiple wells, thereby reducing the configuration cost. At the same time, the water content measuring instrument 1 can be easily repaired and maintained after being removed, and the valve 7 is in a closed state without affecting the normal operation of the wellhead process, which greatly reduces the impact on production efficiency. In addition, the crude oil water content detection device of the utility model has a simple structure and is easy to implement. The process of installing and disassembling the water content measuring instrument 1 is relatively convenient. The parts are all threadedly connected, and the operation efficiency is high. The water content of crude oil in each oil well can be quickly detected, and it can be flexibly disassembled when not being detected, providing accurate data support for further realizing the comprehensive analysis of the water content of crude oil in various well conditions and different time periods.

[0038] In other embodiments of the crude oil water content detection device: the vertical pipe and the valve body may be flange-connected, and the valve body and the lower connecting pipe may be flange-connected, that is, connecting flanges are provided at both ends of the valve body.

[0039] In other embodiments of the crude oil water content detection device: the lower connecting pipe and the lower joint, and the upper connecting pipe and the lower joint can also be flange connected. In this case, the flange of the lower joint is clamped between the flange of the upper connecting pipe and the flange of the lower connecting pipe, and the three flanges can be connected by the same set of bolts.

[0040] In other embodiments of the crude oil water content detection device: the upper connecting pipe and the upper joint may also be flange-connected.

[0041] In other embodiments of the crude oil water content detection device: the valve may not be a ball valve, but a plug valve, in which case the through hole is still arranged on the valve core; in other embodiments, the valve may also be a gate valve, which includes a movable gate plate, which constitutes the valve core, and in which case the through hole is located in the valve body, and when the gate plate is removed, the hole in the valve body constitutes a through hole for the measuring rod to pass through.

[0042] In other embodiments of the crude oil water content detection device: since the crude oil can enter the vertical pipe, according to the actual sizes of the probe and the horizontal pipe, the probe can also be partially extended into the horizontal pipe and partially located in the vertical pipe. At this time, the inner cavities of the horizontal pipe and the vertical pipe together constitute a measuring cavity.

[0043] In other embodiments of the crude oil water content detection device: the connection structure at both ends of the cross pipe for fixed connection with the wellhead process can also be a threaded structure, that is, the connecting flange is omitted and the internal or external threads at both ends of the cross pipe are directly connected to the wellhead process.

[0044] In other embodiments of the crude oil water content detection device: the connection arrangement of the horizontal pipe and the vertical pipe can also be replaced by the method in patent document CN114893170A, that is, this partial structure includes a vertical pipe and two horizontal pipes vertically fixedly connected to the vertical pipe, and the ends of each horizontal pipe are respectively provided with a connecting structure (flange or thread) for fixed connection with the wellhead process, and the inner cavity of the pipe section of the vertical pipe located below the horizontal pipes on both sides constitutes a measuring cavity, and the probe is extended into the inner cavity of the pipe section during measurement.

[0045] In other embodiments of the crude oil water content detection device: when the crude oil pressure is not large, the vent valve may not be installed on the lower connecting pipe.

[0046] In other embodiments of the crude oil water content detection device: the detachable connection mode of the plug may also be a flange connection, in which case a connecting flange needs to be provided at the upper end of the lower connecting pipe.

[0047] In other embodiments of the crude oil water content detection device: the crude oil water content detection device may not include a plug, in which case the upper end of the lower connecting pipe may be covered with a plastic sheet, and the lower joint does not need to be disassembled. In other embodiments, in the absence of a plug, the lower connecting pipe may be removed together, and then the upper port of the valve body may be covered with a plastic sheet, or a plug suitable for the upper port of the valve body may be made, and after the lower connecting pipe is removed, the plug is connected to the valve body to achieve blocking, and of course the plug needs to be detachable.

[0048] In other embodiments of the crude oil water content detection device: when the measuring rod and the instrument head of the water content measuring instrument are detachably connected, the measuring rod can be removed first, and then the locking nut can be sleeved from the upper end of the measuring rod to the outside of the stop section of the measuring rod, or the locking nut is in two halves, the two halves are fastened and sleeved on the outside of the stop section, and at this time, a shaft ring or a shaft shoulder can be set on the outer periphery of the stop section to cooperate with the end cover of the locking nut.

[0049] In other embodiments of the crude oil water content detection device: the crude oil water content detection device may not include a locking nut. When the screw section of the measuring rod is installed in place, the measuring rod is kept in a predetermined position only by the self-locking effect of the threaded connection. At this time, there is no need to set a protrusion, a shaft ring or a shoulder on the stop section of the measuring rod. Of course, the measuring rod may not include the stop section, and the screw section extends all the way to a position close to the instrument head.

[0050] In other embodiments of the crude oil water content detection device: the measuring rod may not include a screw segment. In this case, there is no need to set an upper joint with a threaded hole. For example, the surface of the measuring rod is a bare rod. However, in order to fix the position of the measuring rod, a connecting flange may be set on the measuring rod, and a connecting flange is also set at the upper end of the upper connecting pipe. In this case, the measuring rod is connected to the upper connecting pipe via a flange. Of course, the upper connecting pipe may also be omitted. In this case, a connecting flange may be set on the lower joint, and the measuring rod is connected to the lower joint via a flange.

[0051] In other embodiments of the crude oil water content detection device: the lower joint and the lower connecting pipe can also be arranged in one piece, and there is no need to further process and assemble the lower joint.

[0052] In other embodiments of the crude oil water content detection device: the lower end of the lower connecting pipe can also be connected to the vertical pipe, or the vertical pipe is not fixed on the horizontal pipe, and the lower end of the lower connecting pipe is directly welded and fixed to the horizontal pipe and connected to the horizontal pipe. At this time, the valve is arranged at the upper end of the lower connecting pipe, and the sealing structure can still be arranged in the lower connecting pipe. When the diameter of the lower connecting pipe is matched with the rod diameter of the measuring rod, the installation groove can be directly processed on the inner wall of the lower connecting pipe and the sealing ring can be installed, without the need to set up a joint and process the sealing ring installation groove on the joint.

[0053] In other embodiments of the crude oil water content detection device: when the valve is arranged at the upper end of the lower connecting pipe, an upper connecting pipe can be connected to the upper end of the valve, and a sealing structure cooperating with the measuring rod seal is arranged in the upper connecting pipe.

[0054] In other embodiments of the crude oil water content detection device: the control mechanism for controlling the valve core movement may also be an electric mechanism, in which case manual operation is not required.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crude oil water content detection device, comprising a measuring tube for installation on a wellhead process, the measuring tube having a measuring cavity and a through passage for a measuring rod of a water content measuring instrument to pass through so that a probe at the end of the measuring rod can extend into the measuring cavity, characterized in that: A sealing structure for sealing with the measuring rod is arranged on the through channel, and a valve is also arranged on the through channel, the valve comprises a valve body, a valve core arranged in the valve body and a control mechanism for controlling the movement of the valve core, the valve core or the valve body has a through hole for the probe to pass through, and the valve core has an open state in the movement stroke in which the valve is opened to allow the probe to pass through the through hole and extend into the measuring cavity, and also has a closed state in which the valve is closed after the probe exits the measuring cavity and the through hole so that the water content measuring instrument can be detached.

2. The crude oil water content detection device according to claim 1, characterized in that: The measuring tube includes a vertically arranged lower connecting tube, the lower end of which is connected to the valve body, the upper end of which is connected to a lower joint, a through hole for the measuring rod to pass through is arranged on the lower joint, and the sealing structure is a sealing ring installed in the through hole and used for contacting and sealing with the light rod section of the measuring rod.

3. The crude oil water content detection device according to claim 2, characterized in that: The measuring tube also includes an upper connecting tube arranged vertically and for the measuring rod to pass through. The lower end of the upper connecting tube is connected to the lower joint, and the upper end of the upper connecting tube is connected to the upper joint. The upper joint is provided with a threaded hole for threadedly cooperating with the screw section of the measuring rod.

4. The crude oil water content detection device according to claim 3, characterized in that: The crude oil water content detection device also includes a locking nut which is sleeved on the outside of the measuring rod and cooperates with the measuring rod in the axial direction. The locking nut is used to be threadedly assembled on the upper joint after the screw section of the measuring rod and the upper joint are assembled in place.

5. The crude oil water content detection device according to any one of claims 2 to 4, characterized in that: The lower joint is detachably connected to the lower connecting pipe. The crude oil water content detection device also includes a plug detachably connected to the upper end of the lower connecting pipe when the valve core is in a closed state and the water content measuring instrument and the lower joint are removed.

6. The crude oil water content detection device according to any one of claims 2 to 4, characterized in that: A vent valve is installed on the lower connecting pipe.

7. The crude oil water content detection device according to any one of claims 2 to 4, characterized in that: The measuring tube also includes a horizontal tube and a vertical tube vertically connected to the horizontal tube. Both ends of the horizontal tube are respectively provided with connection structures for fixed connection with the wellhead process. The inner cavity of the horizontal tube or the inner cavities of the horizontal tube and the vertical tube constitute the measuring cavity. The valve body is connected between the vertical tube and the lower connecting pipe.

8. The crude oil water content detection device according to any one of claims 1 to 4, characterized in that: The valve is a ball valve, and the valve core is a sphere.

9. The crude oil water content detection device according to claim 3 or 4, characterized in that: The lower connecting pipe and the valve body, the lower connecting pipe and the lower joint, the upper connecting pipe and the lower joint, and the upper connecting pipe and the upper joint are all connected by threaded fitting.

10. The crude oil water content detection device according to claim 7, characterized in that: The vertical pipe and the valve body are connected by threaded fitting.

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