High-precision oil production wellhead device and control system thereof

Abstract

The invention relates to the technical field of oil extraction, in particular to a high-precision oil extraction wellhead device and a control system thereof, the high-precision oil extraction wellhead device comprises a casing head, the casing head comprises a pipe head main body, an upper adjusting flange, a lower adjusting flange, a transparent hollow ring, a metal ball and a leveling bolt, and the upper adjusting flange is coaxially and fixedly connected with the pipe head main body. According to the high-precision oil production wellhead device, the transparent hollow ring and the metal ball are arranged, the inclination direction of the upper adjusting flange can be rapidly determined, and in the prior art, the inclination direction of the upper adjusting flange can be determined only by using a bubble level and needing to change positions for multiple times; when the upper adjusting flange is leveled, leveling can be achieved by rotating two leveling bolts, while leveling can be achieved by rotating a plurality of leveling bolts in the prior art, so that when the upper adjusting flange is leveled by adopting the upper adjusting flange leveling device, the efficiency is higher, and more time is saved.

Description

Technical Field

[0001] This invention relates to the field of oil production technology, and in particular to a high-precision oil wellhead device and its control system. Background Technology

[0002] The casing head is the "foundation" of the wellhead equipment. Core equipment such as the tubing head, Christmas tree, and blowout preventer need to be connected to it in sequence. All the flange interfaces and threaded holes of the equipment are designed to be coaxial. Therefore, the levelness of the casing head is required to be high. If the levelness error of the casing head is large, the flange faces of the upper and lower equipment will not be able to fit completely, the bolt holes will be misaligned, and forcibly tightening the bolts will cause local stress concentration on the flange face. This will not only fail to achieve effective sealing, but may also cause flange deformation and bolt breakage.

[0003] The casing head includes a casing head body, an upper adjusting flange, a lower adjusting flange, and multiple adjusting bolts. The casing head is sealed and fitted onto the outside of the casing. The upper adjusting flange is coaxially and fixedly connected to the casing head body. The upper adjusting flange and the lower adjusting flange are spaced apart vertically. The lower adjusting flange is connected to the upper adjusting flange by multiple adjusting bolts that are circumferentially spaced. During installation, the lower adjusting flange is first coaxially mounted on the upper end face of the sleeve. Then, the sleeve head body is installed outside the sleeve. Since the sleeve is suspended in the uncured concrete slurry, it is impossible to guarantee that the upper end face of the sleeve is horizontal. Consequently, the flange face of the sleeve head body installed on the upper end face of the sleeve cannot be guaranteed to be horizontal. Therefore, it is necessary to adjust the levelness of the flange face of the sleeve head body. Specifically, the upper and lower adjusting flanges are connected together by adjusting bolts. Then, a level is placed on the upper adjusting flange, and the fitting length between each bolt and the lower adjusting flange is adjusted according to the direction of the level to adjust the upper adjusting flange to be horizontal. This also adjusts the sleeve head body to be horizontal. Since different bolts need to be adjusted multiple times during the adjustment process, the entire operation is quite cumbersome and time-consuming. Summary of the Invention

[0004] Therefore, it is necessary to provide a high-precision oil wellhead device and its control system to address the problems existing in current oil wellhead devices, in order to solve the problem of the cumbersome and time-consuming process of adjusting the level of the casing head.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A high-precision oil wellhead device includes: a casing head, the casing head comprising:

[0007] Pipe head body;

[0008] The upper adjusting flange is coaxially fixed to the main body of the pipe head;

[0009] The lower adjusting flange is located below the upper adjusting flange and is connected to the upper adjusting flange, and is configured such that the lower adjusting flange and the upper adjusting flange can move synchronously along their axis and rotate relative to each other about their axis.

[0010] A transparent hollow ring is coaxially rotatably mounted on the upper adjusting flange. The transparent hollow ring has an annular cavity inside, which is filled with liquid and has a single air bubble.

[0011] A metal ball is placed inside a transparent hollow ring and can roll circumferentially within the transparent hollow ring;

[0012] There are two leveling bolts. The axis of the leveling bolts is perpendicular to the upper adjusting flange. The two leveling bolts are circumferentially spaced and threaded onto the upper adjusting flange. The two leveling bolts extend downwards to abut against the lower adjusting flange.

[0013] Preferably, the upper end face of the upper adjusting flange is provided with at least two level mounting slots at equal intervals around the circumference.

[0014] Preferably, the transparent hollow ring is connected to the upper adjusting flange by a set screw, which is used to restrict the rotation of the transparent hollow ring relative to the upper adjusting flange.

[0015] Preferably, the sleeve head further includes a first driving component, which is disposed on the outside of the annular cavity and is used to drive the metal ball to roll within the annular cavity.

[0016] Preferably, the sleeve head further includes a second driving assembly, which is disposed inside the annular cavity and is used to drive the metal ball to roll within the annular cavity;

[0017] The second drive component has the same structure as the first drive component.

[0018] Preferably, the first driving component includes an upper open ring, a lower open ring, and a power supply. The upper open ring and the lower open ring are disposed at an interval on the outside of the annular cavity. The upper open ring and the lower open ring are in contact with the metal ball at the same time, and the opening positions of the upper open ring and the lower open ring overlap vertically. Both the upper open ring and the lower open ring are made of conductive metal. The positive terminal of the power supply is connected to one end of the upper open ring, and the negative terminal of the power supply is connected to the same end of the lower open ring.

[0019] The opening positions of the upper and lower open rings of the second drive component are reversed compared to the opening positions of the upper and lower open rings of the first drive component.

[0020] A control system for a high-precision oil wellhead device is provided, which is applied to the high-precision oil wellhead device. The control system of the high-precision oil wellhead device includes a resistance detection module, a storage module, and a controller.

[0021] The resistance detection module is used to obtain the resistance value of the circuit formed by the first driving component and the metal ball at the moment of energization;

[0022] The storage module is used to store the resistance values ​​measured by the resistance detection module;

[0023] The controller is configured to control the power supply corresponding to the first drive component to be powered on for a second preset time interval after a first preset time interval, wherein the first preset time interval is longer than the second preset time interval;

[0024] And it is configured to receive the resistance value stored in the storage module and compare the resistance values ​​before and after;

[0025] If the resistance values ​​are the same in the two tests, the controller will increase the second preset duration.

[0026] If the resistance values ​​are different in the two tests, the controller will maintain the second preset duration.

[0027] Preferably, the control system of a high-precision oil wellhead device further includes a first alarm;

[0028] If the resistance values ​​remain the same after adding a second preset duration, the controller will activate the first alarm.

[0029] Preferably, the resistance detection module is further used to obtain the resistance value of the circuit formed by the second driving component and the metal ball at the instant of energization;

[0030] The controller is configured to control the power supply corresponding to the second drive component to be powered on for a second preset time interval after a first preset time interval, wherein the first preset time interval is longer than the second preset time interval;

[0031] If the first drive component and the metal ball do not form a power-on circuit, the controller first controls the power supply corresponding to the first drive component to stop working, and then controls the power supply corresponding to the second drive component to work.

[0032] Preferably, the control system of a high-precision oil wellhead device further includes a second alarm;

[0033] If the second drive component and the metal ball do not form an energized circuit, the controller will activate the second alarm.

[0034] The beneficial effects of this invention are:

[0035] 1. This invention provides a high-precision oil wellhead device. The high-precision oil wellhead device is equipped with a transparent hollow ring and a metal ball, which can quickly determine the tilt direction of the upper adjusting flange. In contrast, the prior art only uses a bubble level, which requires multiple position changes to determine the tilt direction of the upper adjusting flange. In addition, when leveling the upper adjusting flange, this invention can achieve leveling by rotating two leveling bolts, while the prior art requires rotating multiple leveling bolts. Therefore, using this invention to level the upper adjusting flange is more efficient and saves more time.

[0036] 2. This invention provides a control system for a high-precision oil wellhead device. When powered on, the system determines the position of the metal ball by comparing the resistance values ​​before and after the test. Based on the position of the metal ball, the levelness of the upper adjusting flange is detected. If the metal ball returns to its initial position after different periods of power-on, it indicates that the upper adjusting flange is tilted. At this time, the controller sends a signal to the first alarm, which sounds to prompt the staff to deal with the fault in a timely manner. Attached Figure Description

[0037] Figure 1 This is an overall schematic diagram of a high-precision oil wellhead device according to the present invention;

[0038] Figure 2 for Figure 1 The front view;

[0039] Figure 3 This is a schematic diagram of the casing head structure in a high-precision oil wellhead device according to the present invention;

[0040] Figure 4 for Figure 3 The front view;

[0041] Figure 5 for Figure 3 The right view;

[0042] Figure 6 for Figure 4 AA section view;

[0043] Figure 7 for Figure 6 A magnified schematic diagram of the structure at point C;

[0044] Figure 8 for Figure 5 BB section view;

[0045] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point D;

[0046] Figure 10 This is an exploded view of the casing head in a high-precision oil wellhead device according to the present invention.

[0047] Figure 11 This is a schematic diagram of the transparent hollow ring in a high-precision oil wellhead device of the present invention;

[0048] Figure 12 This is a half-section axonometric view of a transparent hollow ring in a high-precision oil wellhead device of the present invention;

[0049] Figure 13 for Figure 12 A magnified schematic diagram of the structure at point E in the middle;

[0050] Figure 14 This is an exploded view of a transparent hollow ring in a high-precision oil wellhead device according to the present invention.

[0051] Figure 15 for Figure 7 A magnified schematic diagram of the structure at point F.

[0052] in:

[0053] 100. Sleeve head; 110. Upper adjusting flange; 111. Upper fixing ring; 112. Intermediate ring; 113. Lower fixing ring; 114. Connecting block; 120. Lower adjusting flange; 121. Side annular groove; 122. Upper annular groove; 123. Lower abutment ring; 130. Transparent hollow ring; 140. Metal ball; 150. Leveling bolt; 161. Rolling column; 162. Lower threaded sleeve; 163. Double-ended screw; 164. Upper threaded sleeve; 171. First sealing slip; 172. Second sealing slip; 173. Slip connecting seat; 180. Pipe head body;

[0054] 200. Level mounting slot;

[0055] 300, set screw;

[0056] 400, First drive assembly; 410, Upper open ring; 420, Lower open ring; 430, Negative contact; 440, Positive contact;

[0057] 500. Second drive component;

[0058] 600. Oil well tree;

[0059] 710. Inspection valve; 720. Pressure gauge;

[0060] 800, sleeve;

[0061] 900, catheter. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0063] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] like Figures 1 to 15As shown, a high-precision oil wellhead device includes a casing head 100, which comprises a casing head body 180, an upper adjusting flange 110, a lower adjusting flange 120, a transparent hollow ring 130, a metal ball 140, and leveling bolts 150. The upper adjusting flange 110 is coaxially fixed to the casing head body 180. The lower adjusting flange 120 is located below the upper adjusting flange 110 and is connected to the upper adjusting flange 110. The lower adjusting flange 120 and the upper adjusting flange 110 are configured to move synchronously along their axes and rotate relative to each other around their axes. The transparent hollow ring 130 is coaxially rotatably mounted on the upper adjusting flange 110. The transparent hollow ring 130 has an annular cavity filled with liquid (e.g., ethanol, due to its good fluidity and stability) and contains an air bubble. A metal ball 140 is located inside the transparent hollow ring 130 and can roll circumferentially inside the transparent hollow ring 130. There are two leveling bolts 150, the axis of which is perpendicular to the upper adjusting flange 110. The two leveling bolts 150 are circumferentially equidistant and threadedly connected to the upper adjusting flange 110. The two leveling bolts 150 can penetrate downwards to abut against the lower adjusting flange 120. In the initial state, the two leveling bolts 150 abut against the lower adjusting flange 120.

[0066] Before installing the casing head 100, the guide pipe 900 has been fixedly installed downhole in the oilfield, its position is fixed, and the axis of the guide pipe 900 remains vertical. The casing 800 is suspended inside the guide pipe 900, and the interlayer between the casing 800 and the guide pipe 900 is filled with uncured concrete grout. Next, the workers grind the upper surfaces of the casing 800 and the guide pipe 900 to make them flat. Then, the casing head 100 is smoothly hoisted to the wellhead and kept horizontal. Subsequently, the casing head 100 is slowly lowered until the shoulder of the casing head body 180 contacts the upper surface of the casing 800. Next, the levelness of the casing head body 180 is corrected. Specifically, the workers first loosen the leveling bolts 150, so that... Once the lower end of the leveling bolt 150 is no longer abutting against the lower adjusting flange 120, observe the positions of the bubble and metal ball 140 in the transparent hollow ring 130 on the upper adjusting flange 110. If the bubble and metal ball 140 are located at opposite ends of the diameter of the transparent hollow ring 130, it indicates that the upper adjusting flange 110 may be tilted. This is because if the upper adjusting flange 110 is tilted, the metal ball 140 will roll to the lowest point of the annular cavity under its own weight, and the bubble will move to the highest point of the annular cavity. However, it is also possible that the upper adjusting flange 110 is horizontal, and the initial positions of the metal ball 140 and the bubble are exactly located at opposite ends of the diameter of the transparent hollow ring 130. To rule out this possibility, the operator can slowly rotate the transparent hollow ring 130. If the positions of the metal ball 140 and the bubble in the annular cavity change with the rotation of the transparent hollow ring 130, it indicates that the upper adjusting flange 110 is horizontal. At this point, the two leveling bolts 150 are fed downwards synchronously until their lower ends abut against the lower adjusting flange 120. If the positions of the metal ball 140 and the bubble do not change with the rotation of the transparent hollow ring 130, it indicates that the upper adjusting flange 110 is tilted, and the straight line along the tilt direction of the upper adjusting flange 110 is the line connecting the center of the bubble and the center of the metal ball 140. Next, the operator places at least two bubble levels on the upper adjusting flange 110, spaced apart. Then, the operator maintains a transparent... With the position of the hollow ring 130 unchanged, rotate the upper adjusting flange 110 so that the positions of the two leveling bolts 150 on the upper adjusting flange 110 correspond to the positions of the metal ball 140 and the bubble, that is, the two leveling bolts 150, the metal ball 140, and the bubble are located at opposite ends of the same diameter. At this time, the operator rotates the two leveling bolts 150. Specifically, first rotate the leveling bolt 150 corresponding to the position of the bubble, so that the leveling bolt 150 is fed downwards until the lower end of the leveling bolt 150 abuts against the lower adjusting flange 120. After the lower end of the leveling bolt 150 abuts against the lower adjusting flange 120, as the leveling bolt 150 continues to be fed downwards, the end of the upper adjusting flange 110 corresponding to the metal ball 140 gradually rotates upwards.The tilt angle of the upper adjusting flange 110 gradually decreases. Simultaneously, the operator observes the bubble level and, based on its indication, adaptively rotates another leveling bolt 150 until the upper end face of the upper adjusting flange 110 is horizontal. Next, the operator simultaneously advances both leveling bolts 150, increasing the clamping force between the two leveling bolts 150 and the lower adjusting flange 120 to a preset value. Finally, the lower adjusting flange 120 is welded to the conduit 900. After the concrete in the interlayer solidifies, the positions of the sleeve 800 and the conduit 900 are fixed.

[0067] In summary, by setting up a transparent hollow ring 130 and a metal ball 140, the present invention can quickly determine the tilt direction of the upper adjusting flange 110. In contrast, the prior art only uses a bubble level, which requires multiple adjustments to determine the tilt direction of the upper adjusting flange 110. Furthermore, when leveling the upper adjusting flange 110, the present invention can achieve leveling by rotating two leveling bolts 150, while the prior art requires rotating multiple leveling bolts 150 (more than two) to achieve leveling. Therefore, using the present invention to level the upper adjusting flange 110 is more efficient and saves more time.

[0068] Furthermore, such as Figure 4 , Figure 7 and Figure 15 As shown, to enable the lower adjusting flange 120 and the upper adjusting flange 110 to move synchronously along their axes and rotate relative to each other around their axes (i.e., rotate relative to each other in a vertical plane), a side annular groove 121 is provided on the outer circumferential surface of the lower adjusting flange 120. A rolling column 161 is slidably connected in the side annular groove 121. The part of the rolling column 161 that contacts the side annular groove 121 is an arc surface. The diameter of the column body of the rolling column 161 is smaller than the groove height of the side annular groove 121. The axis of the rolling column 161 is perpendicular to the lower adjusting flange 120. The axis of the rolling column 161 is fixedly connected to the lower threaded sleeve 162. The lower threaded sleeve 162 and the lower adjusting flange 120 have a preset gap. The axis of the lower threaded sleeve 162 is perpendicular to the axis of the rolling column 161. The lower threaded sleeve 162 is coaxially threaded with a double-ended screw 163. The threads at both ends of the double-ended screw 163 turn in opposite directions. The end of the double-ended screw 163 away from the lower threaded sleeve 162 is threaded with an upper threaded sleeve 164. The upper threaded sleeve 164 is hinged to the upper adjusting flange 110.

[0069] It is understandable that the upper threaded sleeve 164 is hinged to the upper adjusting flange 110 so that the upper adjusting flange 110 can rotate relative to the lower adjusting flange 120 around the hinge axis. The diameter of the cylindrical portion of the rolling column 161 is smaller than the groove height of the side annular groove 121, a preset gap exists between the lower threaded sleeve 162 and the lower adjusting flange 120, and the part of the rolling column 161 that contacts the side annular groove 121 is an arc surface. These measures ensure that the upper adjusting flange 110 can rotate relative to the lower adjusting flange 120 within a certain range, thereby allowing the upper adjusting flange 110 and the lower adjusting flange 120 to rotate relative to each other within a certain range in the vertical plane. It should be further noted that this invention is used for high-precision adjustment of the levelness of the upper adjusting flange 110 within a small range. When the tilt angle of the upper adjusting flange 110 is too large, the tilt direction of the upper adjusting flange 110 can be roughly determined by visual observation without the need for leveling equipment.

[0070] Furthermore, such as Figure 10 As shown, the upper adjusting flange 110 includes an upper fixing ring 111, an intermediate ring 112, and a lower fixing ring 113. The upper fixing ring 111 and the pipe head body 180 are fixedly connected by multiple circumferentially spaced connecting blocks 114. The lower fixing ring 113 and the upper fixing ring 111 are fixedly connected by bolts. The intermediate ring 112 is sandwiched between the upper fixing ring 111 and the lower fixing ring 113. The preload provided by the bolts fixes the intermediate ring 112 between the upper fixing ring 111 and the lower fixing ring 113, so that the pipe head body 180, the upper fixing ring 111, the intermediate ring 112, and the lower fixing ring 113 are fixedly connected as a whole.

[0071] Furthermore, an annular guide groove is provided on the upper fixed ring 111, and the transparent hollow ring 130 is rotatably disposed in the annular guide groove, so that the transparent hollow ring 130 is rotatably connected to the upper adjusting flange 110.

[0072] To prevent the leveling bolt 150 from rotating relative to the lower adjusting flange 120, which would cause a stepped groove to appear on the upper end face of the lower adjusting flange 120, further, such as Figure 4 , Figure 7 and Figure 10As shown, the upper end face of the lower adjusting flange 120 is provided with an upper annular groove 122. A lower abutment ring 123 is rotatably disposed in the upper annular groove 122. Two bolt connection holes are provided at the upper end of the lower abutment ring 123. The positions of the two bolt connection holes correspond to the positions of the two leveling bolts 150, and the two ends of the bolt connection holes are connected. The leveling bolts 150 are inserted into the bolt connection holes. When the upper adjusting flange 110 needs to rotate relative to the lower adjusting flange 120, the leveling bolts 150 no longer abut against the lower adjusting flange 120. At this time, the upper adjusting flange 110 drives the lower abutment ring 123 to rotate synchronously through the leveling bolts 150. The lower abutment ring 123 rotates along the upper annular groove 122. In this way, a stepped groove will not be formed between the leveling bolts 150 and the lower adjusting flange 120.

[0073] Furthermore, such as Figure 9 As shown, the lower end of the pipe head body 180 is bolted with a first sealing slip 171. Specifically, the lower end of the first sealing slip 171 is provided with a slip connecting seat 173. Multiple bolts are provided on the end face of the slip connecting seat 173. The bolts are threaded onto the pipe head body 180. The first sealing slip 171 is annular, with a circular outer circumference and a ratchet-shaped inner circumference. A second sealing slip 172 is fitted on the outside of the sleeve 800. The inner circumference of the second sealing slip 172 is circular and fits against the outer circumference of the sleeve 800. The outer circumference of the second sealing slip 172 is ratchet-shaped, and the outer circumference of the second sealing slip 172 cooperates with the inner circumference of the first sealing slip 171.

[0074] When the upper adjusting flange 110 is adjusted to a horizontal position and the leveling bolt 150 is pressed against the lower adjusting flange 120 at a preset pressure value, it is necessary to improve the sealing performance between the pipe head body 180 and the sleeve 800. Specifically, the operator rotates the bolt connected to the slip connector 173, which drives the slip connector 173 to move upward along the axis of the sleeve 800. At this time, the slip connector 173 drives the first sealing slip 171 to move synchronously. The ratchet-shaped inner circumferential surface of the first sealing slip 171 presses against the ratchet-shaped outer circumferential surface of the second sealing slip 172, thereby increasing the positive pressure on the contact surfaces of the pipe head body 180, the first sealing slip 171, the second sealing slip 172, and the sleeve 800, thereby improving the sealing performance and preventing oil leakage from the sleeve 800.

[0075] In a further embodiment, such as Figure 3 As shown, the upper end face of the upper adjusting flange 110 is provided with at least two level mounting slots 200 at equal intervals around the circumference.

[0076] The purpose of setting the level mounting groove 200 is to facilitate fixing the bubble level to the upper end face of the upper adjusting flange 110, and to prevent the bubble level from sliding on the surface of the upper adjusting flange 110 when the upper adjusting flange 110 is tilted.

[0077] In a further embodiment, such as Figure 3 As shown, the transparent hollow ring 130 is connected to the upper adjusting flange 110 by a set screw 300. The set screw 300 is used to restrict the rotation of the transparent hollow ring 130 relative to the upper adjusting flange 110. Specifically, the set screw 300 is threaded on the outside of the annular guide rail, the axis of the set screw 300 is perpendicular to the axis of the annular guide rail, and the set screw 300 passes through the annular guide rail.

[0078] Before leveling the upper adjusting flange 110, the operator rotates the set screw 300 to loosen the transparent hollow ring 130, allowing the transparent hollow ring 130 to rotate relative to the upper adjusting flange 110. After the upper adjusting flange 110 is leveled, and before the leveling bolt 150 is pressed against the lower adjusting flange 120 with a preset pressure, the operator rotates the set screw 300 to tighten the transparent hollow ring 130. The set screw 300 restricts the rotation of the transparent hollow ring 130 relative to the upper adjusting flange 110. Next, the operator can slowly rotate the upper adjusting flange 110 and observe the position of the metal ball 140 and the bubble to verify whether the upper adjusting flange 110 has been leveled.

[0079] In a further embodiment, such as Figure 2 As shown, a tree 600 is fixedly connected to the upper end of the casing head 180. The tree 600 is used to connect the casing head 100 and the surface oil production facility.

[0080] In a further embodiment, such as Figure 2 As shown, the wellhead 600 is equipped with a detection valve 710 and a pressure gauge 720. When the detection valve 710 is opened, the pressure gauge 720 can be used to detect the oil pressure in the main body 180 of the pipe head to reflect the downhole production pressure, so as to help the staff judge whether there are problems such as cross-pressure or leakage downhole.

[0081] During oil extraction, improper operation, uneven stress at the wellhead, and issues with surface pipelines may cause tilting deviations in the casing head 100. To ensure that the levelness of the casing head 100 remains within the allowable error range, it is necessary to inspect the levelness of the casing head 100. This allows for timely correction of the casing head 100's levelness if the deviation exceeds the allowable error. To address this issue, in a further embodiment, such as... Figure 7As shown, the sleeve head 100 also includes a first driving assembly 400, which is disposed on the outside of the annular cavity and is used to drive the metal ball 140 to roll within the annular cavity. The first driving assembly 400 includes an upper open ring 410, a lower open ring 420, and a power source. The upper open ring 410 and the lower open ring 420 are disposed vertically at intervals on the outside of the annular cavity. The upper open ring 410 and the lower open ring 420 are in contact with the metal ball 140 simultaneously, and the opening positions of the upper open ring 410 and the lower open ring 420 overlap vertically. Both the upper open ring 410 and the lower open ring 420 are made of conductive metal. The liquid in the annular cavity is an insulating liquid, preferably ethanol. The positive terminal of the power source is connected to one end of the upper open ring 410, and the negative terminal of the power source is connected to the same end of the lower open ring 420. In addition, this embodiment also provides A control system for detecting the levelness of the casing head 100 is applied to the aforementioned high-precision oil wellhead device. The control system of the high-precision oil wellhead device includes a resistance detection module, a storage module, and a controller. The resistance detection module is used to obtain the resistance value at the instant of energization of the circuit formed by the first drive component 400 and the metal ball 140. The storage module is used to store the resistance value measured by the resistance detection module. The controller is configured to control the power supply corresponding to the first drive component 400 to be energized for a second preset time interval after a first preset time interval, wherein the first preset time interval is longer than the second preset time interval. The controller is also configured to receive the resistance value stored in the storage module and compare the two resistance values. If the two resistance values ​​are the same, the controller controls the second preset time interval to increase. If the two resistance values ​​are different, the controller controls the second preset time interval to remain unchanged.

[0082] During oil extraction, the control system controls the power supply corresponding to the first drive component 400 to be energized for a second preset time interval after a first preset time interval. It also controls the resistance detection module to acquire the instantaneous resistance value of the circuit formed by the upper open ring 410, lower open ring 420, and metal ball 140. Specifically, the power supply output voltage is set to the rated voltage. The resistance detection module first detects the instantaneous current of the circuit formed by the upper open ring 410, lower open ring 420, and metal ball 140, and then divides the rated voltage by the current to obtain the instantaneous resistance value. It should be noted that although there is a delay between the applied voltage and the detected current, the delay between each movement of the metal ball 140 to the detected current remains constant; therefore, the effect of the current detection delay can be ignored.

[0083] When the controller compares the resistance values ​​before and after the two tests and determines that the two resistance values ​​are different, it means that the stopping position of the metal ball 140 in the annular cavity is only controlled by the kinetic energy provided by the power supply. Therefore, the upper adjusting flange 110 must be horizontal. Thus, the control power supply can be kept constant for the second preset duration each time it is powered on.

[0084] When the controller compares the resistance values ​​before and after the power supply, and determines that the two resistance values ​​are the same, it means that after the power supply is turned on and off, the metal ball 140 returned to its initial position within the first preset time period. Based on this, there are two possibilities: the first is that the upper adjusting flange 110 is tilted, causing the metal ball 140 to return to its initial position (i.e., the lowest point) under its own gravity; the second is that the kinetic energy provided by the power supply to the metal ball 140 during the second preset time period is just enough to make the metal ball 140 rotate N (N≥1) revolutions and return to its initial position before stopping. Because the second situation needs to be ruled out, the controller increases the second preset time period. This way, the kinetic energy provided by the power supply to the metal ball 140 during the second preset time period is just enough to make the metal ball 140 rotate N (N≥1) revolutions and return to its initial position before stopping. If the resistance values ​​are the same after the increase in kinetic energy provided, it means that even if different amounts of kinetic energy are provided to the metal ball 140, the metal ball 140 can return to its initial position. This indicates that the upper adjusting flange 110 must be tilted. At this time, the controller can send a signal to the operator so that the operator can inspect the sleeve head 100. If the resistance values ​​are different after the increase in kinetic energy, it means that different amounts of kinetic energy provided to the metal ball 140 can make the metal ball 140 be in different positions in the annular cavity. In this case, the upper adjusting flange 110 is horizontal. At this time, the controller can control the second preset time to the increased second preset time, and then control the power supply to continue to power on the second preset time every first preset time interval.

[0085] Furthermore, in order to connect the upper open ring 410 and the lower open ring 420 to the power supply, a positive contact 440 is provided at one end of the opening of the upper open ring 410, and a negative contact 430 is provided at the other end of the opening of the lower open ring 420. The positive contact 440 and the negative contact 430 are respectively connected to the positive and negative terminals of the power supply.

[0086] It should be noted that the first preset duration is much longer than the second preset duration. The first preset duration is longer because enough time needs to be allowed for the metal ball 140 to return to its initial position when the upper adjusting flange 110 is tilted. The second preset duration is shorter to avoid the metal ball 140 rotating too many times in the annular cavity.

[0087] Furthermore, the control system of this high-precision oil wellhead device also includes a first alarm. The first alarm is connected to the controller. If the resistance values ​​are still the same after the second preset time is increased, the controller will control the first alarm to sound an alarm so that the staff can detect it in time and carry out maintenance on the casing head 100.

[0088] Because the upper open ring 410 and the lower open ring 420 have open areas, when the metal ball 140 stays in the open area, the upper open ring 410 and the lower open ring 420 cannot form a circuit through the metal ball 140. At this time, no current flows through the upper open ring 410 and the lower open ring 420, meaning the metal ball 140 cannot move. This will cause the detection system to fail. To solve this problem, in a further embodiment, the sleeve head 100 also includes a second driving assembly 500. The second driving assembly 500 is located inside the annular cavity and is used to drive the metal ball 140 to roll within the annular cavity. The second driving assembly 500 has the same structure as the first driving assembly 400, and the second driving assembly 500... The opening positions of the upper open ring 410 and the lower open ring 420 of the 0 are reversed compared with the opening positions of the upper open ring 410 and the lower open ring 420 of the first drive component 400. The resistance detection module is also used to obtain the instantaneous resistance value of the circuit formed by the second drive component 500 and the metal ball 140 at the moment of power-on. The controller is configured to control the power supply corresponding to the second drive component 500 to be powered on for a second preset time interval after a first preset time interval. The first preset time interval is longer than the second preset time interval. If the first drive component 400 and the metal ball 140 do not form a power-on circuit, the controller first controls the power supply corresponding to the first drive component 400 to stop working, and then controls the power supply corresponding to the second drive component 500 to work.

[0089] When the power supply corresponding to the first drive component 400 is energized, but the upper open ring 410, lower open ring 420, and metal ball 140 corresponding to the first drive component 400 do not form an energized circuit, that is, the resistance detection module does not obtain the resistance value through the current value, the controller first controls the power supply corresponding to the first drive component 400 to stop working, that is, the controller no longer controls the power supply corresponding to the first drive component 400 to be energized for a second preset time period after a first preset time period, and then the controller controls the power supply corresponding to the second drive component 500 to start working, that is, controls the second drive component 500 to start working. The power supply corresponding to the driving component 500 is energized for a second preset time period after a first preset time period. The control resistance detection module obtains the instantaneous resistance value of the circuit formed by the upper open ring 410, the lower open ring 420 and the metal ball 140 corresponding to the second driving component 500. Specifically, the output voltage of the power supply corresponding to the second driving component 500 is made to be the rated voltage. The resistance detection module first detects the instantaneous current of the circuit formed by the upper open ring 410, the lower open ring 420 and the metal ball 140, and divides the rated voltage by the current to obtain the instantaneous resistance value.

[0090] When the controller compares the resistance values ​​before and after the two values ​​and determines that the two resistance values ​​are different, it means that the position of the metal ball 140 in the annular cavity is only controlled by the kinetic energy provided by the power supply. Therefore, the upper adjusting flange 110 must be horizontal. Thus, the control power supply can keep the second preset time unchanged each time it is powered on.

[0091] When the controller compares the resistance values ​​before and after the two tests and determines that the two resistance values ​​are the same, it means that after the power supply corresponding to the second drive component 500 stops, the metal ball 140 returns to its initial position within the first preset time period. Based on this, there are two possibilities: the first is that the upper adjusting flange 110 is tilted, causing the metal ball 140 to return to its initial position (i.e., the lowest point) under its own gravity; the second is that the kinetic energy provided by the power supply to the metal ball 140 during the second preset time period is just enough to make the metal ball 140 rotate N (N≥1) revolutions and return to its initial position before stopping. Because the second case needs to be ruled out, the controller increases the second preset time period, so that the power supply... During the second preset time of power-on, the kinetic energy provided to the metal ball 140 increases. If the resistance values ​​are still the same before and after, it means that even if different amounts of kinetic energy are provided to the metal ball 140, the metal ball 140 can return to its initial position. This indicates that the upper adjusting flange 110 must be tilted. At this time, the controller can send a signal to the operator so that the operator can inspect the sleeve head 100. If the resistance values ​​are different before and after, it means that different amounts of kinetic energy provided to the metal ball 140 can make the metal ball 140 be in different positions in the annular cavity. In this case, the upper adjusting flange 110 is horizontal. At this time, the controller can control the second preset time to the increased second preset time.

[0092] Similarly, if the resistance values ​​remain the same after adding a second preset time, the controller will activate the first alarm so that staff can detect the problem in time and perform maintenance on the bushing head 100.

[0093] Furthermore, the control system of this high-precision oil wellhead device also includes a second alarm. If the second drive component 500 and the metal ball 140 do not form an energized circuit, the controller will control the second alarm to sound an alarm.

[0094] When the metal ball 140 cannot form a power-conducting circuit with the upper open ring 410 and lower open ring 420 corresponding to the first driving component 400 and the upper open ring 410 and lower open ring 420 corresponding to the second driving component 500, it indicates that the upper open ring 410 and lower open ring 420 are damaged, for example, the positive contact 440 or the negative contact 430 is loose. At this time, the second alarm will sound so that the staff can discover the fault in time and repair it.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A high-precision oil wellhead device, characterized in that, include: The casing head includes: Pipe head body; The upper adjusting flange is coaxially fixed to the main body of the pipe head; The lower adjusting flange is located below the upper adjusting flange and is connected to the upper adjusting flange, and is configured such that the lower adjusting flange and the upper adjusting flange can move synchronously along their axis and rotate relative to each other about their axis. A transparent hollow ring is coaxially rotatably mounted on the upper adjusting flange. The transparent hollow ring has an annular cavity inside, which is filled with liquid and has a single air bubble. A metal ball is placed inside a transparent hollow ring and can roll circumferentially within the transparent hollow ring; There are two leveling bolts. The axis of the leveling bolts is perpendicular to the upper adjusting flange. The two leveling bolts are circumferentially spaced and threaded onto the upper adjusting flange. The two leveling bolts extend downwards to abut against the lower adjusting flange.

2. The high-precision oil wellhead device according to claim 1, characterized in that, The upper end face of the upper adjusting flange is provided with at least two level mounting slots at equal intervals around its circumference.

3. The high-precision oil wellhead device according to claim 1, characterized in that, The transparent hollow ring is connected to the upper adjusting flange by a set screw, which is used to restrict the rotation of the transparent hollow ring relative to the upper adjusting flange.

4. The high-precision oil wellhead device according to claim 1, characterized in that, The sleeve head also includes a first driving component, which is located on the outside of the annular cavity and is used to drive the metal ball to roll within the annular cavity.

5. A high-precision oil wellhead device according to claim 4, characterized in that, The sleeve head also includes a second driving assembly, which is located inside the annular cavity and is used to drive the metal ball to roll within the annular cavity. The second drive component has the same structure as the first drive component.

6. A high-precision oil wellhead device according to claim 5, characterized in that, The first driving component includes an upper open ring, a lower open ring, and a power supply. The upper open ring and the lower open ring are arranged at an interval on the outside of the annular cavity. The upper open ring and the lower open ring are in contact with the metal ball at the same time, and the opening positions of the upper open ring and the lower open ring overlap vertically. Both the upper open ring and the lower open ring are made of conductive metal. The positive terminal of the power supply is connected to one end of the upper open ring, and the negative terminal of the power supply is connected to the same end of the lower open ring. The opening positions of the upper and lower open rings of the second drive component are reversed compared to the opening positions of the upper and lower open rings of the first drive component.

7. A control system for a high-precision oil wellhead device, applied to the high-precision oil wellhead device according to any one of claims 1-6, characterized in that, The control system of the high-precision oil wellhead device includes a resistance detection module, a storage module, and a controller; The resistance detection module is used to obtain the resistance value of the circuit formed by the first driving component and the metal ball at the moment of energization; The storage module is used to store the resistance values ​​measured by the resistance detection module; The controller is configured to control the power supply corresponding to the first drive component to be powered on for a second preset time interval after a first preset time interval, wherein the first preset time interval is longer than the second preset time interval; And it is configured to receive the resistance value stored in the storage module and compare the resistance values ​​before and after; If the resistance values ​​are the same in the two tests, the controller will increase the second preset duration. If the resistance values ​​are different in the two tests, the controller will maintain the second preset duration.

8. The control system for a high-precision oil wellhead device according to claim 7, characterized in that, It also includes the first alarm; If the resistance values ​​remain the same after adding a second preset duration, the controller will activate the first alarm.

9. The control system for a high-precision oil wellhead device according to claim 8, characterized in that, The resistance detection module is also used to obtain the resistance value of the circuit formed by the second driving component and the metal ball at the instant of energization; The controller is configured to control the power supply corresponding to the second drive component to be powered on for a second preset time interval after a first preset time interval, wherein the first preset time interval is longer than the second preset time interval; If the first drive component and the metal ball do not form a power-on circuit, the controller first controls the power supply corresponding to the first drive component to stop working, and then controls the power supply corresponding to the second drive component to work.

10. The control system for a high-precision oil wellhead device according to claim 9, characterized in that, It also includes a second alarm; If the second drive component and the metal ball do not form an energized circuit, the controller will activate the second alarm.

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