An updraft fluid density testing device

Abstract

The utility model discloses a kind of upper fluid density testing devices, it is related to petroleum engineering testing technical field, comprising: support mechanism, the support mechanism is used to clamp the local pipe body of protective tube in, and can walk in wellbore;The protective tube adopts flexible pipe, and detection head is provided at the lower end of protective tube;Traction mechanism, the traction mechanism is set on support mechanism, and is used to pull the detection head, so that the connecting portion of the protective tube and detection head is bent.In the end of detection head is close to build-in section, traction mechanism can drive detection head to be lifted upwards and will not touch bottom, it is favorable to avoid well bottom fluid accumulation error when detecting fluid density in wellbore, improve density measurement authenticity, and then it is favorable to accurately judge oil-water interface and produced fluid characteristics, support fine development and drainage strategy formulation.

Description

Technical Field

[0001] This utility model relates to the field of petroleum engineering testing technology, specifically to an upward-lifting fluid density testing device. Background Technology

[0002] In oilfield development, horizontal wells refer to a drilling method where, after the drill bit reaches the target formation, the wellbore extends horizontally or nearly horizontally within the oil-bearing layer using directional drilling tools and wellbore trajectory control technology. The wellbore typically consists of a vertical section, a directional drilling section, and a horizontal section, with the horizontal section ranging in length from hundreds to thousands of meters. This well type significantly expands the exposed area of ​​the oil-bearing layer and increases single-well productivity, making it one of the core technologies in modern oil and gas field development.

[0003] In horizontal well production, fluid density within the wellbore is a crucial parameter for analyzing production dynamics. Its variations not only reflect the spatial distribution and proportions of oil, gas, and water within the wellbore, but also directly affect bottomhole pressure, fluid flow patterns, and production characteristics. Accurate detection of fluid density can reveal the true fluid distribution within the wellbore, avoiding misjudgments caused by gravity settling or localized fluid accumulation. This parameter provides a reliable basis for production capacity evaluation, fluid drainage strategy formulation, and the implementation of production enhancement policies, and is of great significance for maintaining long-term stable production and efficient development of horizontal wells.

[0004] However, in actual testing, when conventional pressure-temperature-density testing tools enter the build-up or horizontal sections, they often adhere to the bottom of the wellbore due to gravity. At the bottom of the wellbore, due to abnormal liquid gravity distribution, a high-density liquid layer with high water content often forms. This leads to an overestimation of the density value collected by the instrument, resulting in a "false liquid accumulation" phenomenon, which interferes with production status analysis and affects the scientific judgment of drainage and related measures. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention aims to provide an upward-lifting fluid density testing device. When the end of the testing head approaches the build-up section, the traction mechanism can lift the testing head upward without touching the bottom. This helps to avoid bottom-hole fluid accumulation errors when testing fluid density in the wellbore, improves the accuracy of density measurements, and further facilitates accurate judgment of the oil-water interface and production characteristics, supporting refined development and fluid drainage strategy formulation.

[0006] This utility model is achieved through the following technical solution:

[0007] An upward-moving fluid density testing device, comprising:

[0008] A support mechanism is provided to clamp a portion of the protective pipe within the wellbore, allowing it to move within the wellbore. The protective pipe is made of flexible material and has a detection head at its lower end.

[0009] A traction mechanism is mounted on a support mechanism and is used to pull the detection head, causing the connection between the protective tube and the detection head to bend.

[0010] In contrast to existing technologies where testing tools often adhere to the bottom of the wellbore due to gravity when entering the build-up or horizontal sections, and where abnormal fluid gravity distribution at the bottom often results in a high-density fluid layer with high water content, leading to inflated density values ​​and a "false fluid accumulation" phenomenon, this invention provides an upward-lifting fluid density testing device. When the testing head approaches the build-up section, the traction mechanism lifts the head upwards without touching the bottom, mitigating bottom-hole fluid accumulation errors when testing fluid density within the wellbore, improving the accuracy of density measurements, and ultimately facilitating accurate assessment of the oil-water interface and production characteristics, supporting refined development and fluid drainage strategy formulation. The specific solution includes a support structure for supporting the protective pipe. The support structure can be equipped with rollers on its periphery to move inside the wellbore, thereby moving the protective pipe inside the wellbore. This allows the detection head at the end of the protective pipe to detect the fluid. The detection head is equipped with sensors. When the detection head enters the wellbore (which is filled with fluid), the fluid comes into contact with the detection head. The temperature, pressure, and component density sensors inside the detection head can perform various tests on the fluid. The detected data is transmitted to the controller on the ground via a cable, thereby receiving monitoring data in real time. Secondly, a traction mechanism is also provided on the support structure. The traction mechanism has traction force, and the protective tube is a flexible tube that can bend. In this way, when the end of the detection head approaches the directional section, the traction mechanism can lift the detection head upward without touching the bottom. The lifting range is 30°-45°. During the upward movement of the detection head, the connection between the protective tube and the detection head can bend to match the reversing action of the detection head. The protective tube is made of rubber and can bend under tension. After the tension is removed, the rubber tube can automatically reset to facilitate the reset of the detection head. At this time, the upward-lifting fluid density testing device enters the horizontal section of the horizontal well to continue testing. The above scheme helps to avoid the error of bottom hole fluid accumulation when testing the fluid density in the wellbore, improves the accuracy of density measurement, and thus helps to accurately judge the oil-water interface and production characteristics, supporting the formulation of fine development and drainage strategies.

[0011] Further optimization, as a specific walking method of the support mechanism, the support mechanism includes a guide cylinder for fitting the protective pipe inside, and several bearing mechanisms are evenly distributed on the outer periphery of the guide cylinder, the bearing mechanism having rollers that can walk on the side wall of the well barrel.

[0012] For further optimization, in order to have compression deformation and buffering functions, the bearing mechanism also includes a fixed seat and a suspension. The fixed seat is fixed to the outer wall of the guide cylinder and is arranged along the axial direction of the guide cylinder. Suspension is provided at both ends of the fixed seat. The two suspensions are inclined towards each other and connected to the wheel frame. The wheel frame is rotatably connected to the shaft on the roller. The suspension adopts a damping spring structure.

[0013] For further optimization, an arc-shaped mounting rod is provided on the outer wall of the guide cylinder to facilitate the installation of the traction mechanism. The middle part of the arc-shaped mounting rod is connected to the outer wall of the guide cylinder through a fixing rod. The traction mechanism is fixed to the arc-shaped mounting rod.

[0014] To further optimize the detection head and enable it to bend and change direction in multiple directions, at least three arc-shaped mounting rods are evenly distributed around the circumference of the guide cylinder. Each arc-shaped mounting rod is fixed with a traction mechanism. The traction mechanism has a retractable pull wire, which is used to connect to the side wall of the detection head. Several pull wires are evenly distributed around the circumference of the detection head.

[0015] In a further optimization, as a specific implementation of the traction mechanism, the traction mechanism also includes a sealing disc and a motor. The sealing disc is fixed to the inside of the arc-shaped mounting rod; the motor is located inside the sealing disc, and a winding wheel is provided on the output end of the motor, and the pull wire is wound on the winding wheel; the sealing disc has a through hole for the pull wire to pass through.

[0016] For further optimization, in order to serve as a counterweight mechanism for gravity guidance, at least two support mechanisms are provided along the length of the protective pipe, and adjacent support mechanisms are connected by several connecting steel wires.

[0017] Further optimizations include a lifting platform for stabilizing the upward-lifting fluid density testing device during movement via an external crane. The platform is used to connect to the external crane and is fixedly connected to the protective pipe.

[0018] To further optimize the structure and improve its stability and facilitate bending and reversal, the circumferential structure of the hanging platform is connected to the nearest support mechanism via several traction steel wires.

[0019] To further optimize the detection, a probe is provided at the end of the detection head to measure the distance between the detection head and the inner wall of the inclined section.

[0020] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0021] This invention provides an upward-lifting fluid density testing device. When the end of the testing head is close to the build-up section, the traction mechanism can lift the testing head upward without touching the bottom. This helps to avoid the error of fluid accumulation at the bottom of the well when testing the fluid density in the wellbore, improves the accuracy of density measurement, and thus helps to accurately judge the oil-water interface and production characteristics, supporting the formulation of fine development and drainage strategies. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of an upward-lifting fluid density testing device provided by this utility model;

[0024] Figure 2 A perspective view of the support mechanism and traction mechanism provided by this utility model;

[0025] Figure 3 A schematic diagram of the guide cylinder and the load-bearing mechanism provided by this utility model;

[0026] Figure 4 Exploded view of the traction mechanism provided by this utility model;

[0027] Figure 5 A schematic diagram of the supporting mechanism provided by this utility model.

[0028] The attached diagram shows the markings and corresponding component names:

[0029] 100. Support mechanism; 110. Connecting steel wire; 111. Fixing block; 120. Bearing mechanism; 121. Roller; 122. Wheel frame; 123. Suspension; 124. Fixing seat; 130. Guide cylinder; 140. Fixing rod; 150. Arc-shaped mounting rod; 210. Traction steel wire; 300. Detection head; 310. Cable; 320. Probe head; 400. Traction mechanism; 401. Sealing disc; 402. Winding wheel; 403. Fixing plate; 404. Motor; 405. Mounting seat; 406. Pull wire; 500. Protective tube; 700. Hanging platform. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0031] Example:

[0032] This embodiment provides an upward-lifting fluid density testing device, such as... Figures 1-5 As shown, it includes:

[0033] Detection head 300, protective tube 500, support mechanism 100, traction mechanism 400;

[0034] like Figure 1 As shown, the end of the protective pipe 500 is provided with a lifting plate 700 connected to a crane. During the fluid density detection process, the crane on the ground grabs the lifting plate 700 and puts the detection head 300, protective pipe 500, support mechanism 100 and traction mechanism 400 into the well. The detection head 300, protective pipe 500, support mechanism 100 and traction mechanism 400 first enter the vertical section of the horizontal well vertically downward. During this section, the detection head 300 is in a vertical downward state and continues to move downward.

[0035] It should be noted that the support mechanism 100 includes a guide cylinder 130, a protective pipe 500 passes through the guide cylinder 130, and the inner wall of the guide cylinder 130 contacts the outer wall of the protective pipe 500. The support mechanism 100 also includes a bearing mechanism 120, which is used to support the guide cylinder 130 and drive the protective pipe 500 to move in the wellbore.

[0036] In this embodiment, specifically, the bearing mechanism 120 includes a roller 121, a rotating shaft is provided in the middle of the roller 121, a wheel frame 122 is provided at the end of the shaft, a suspension 123 is connected to the end of the wheel frame 122, and a fixed seat 124 is connected to the tail end of the suspension 123. The fixed seat 124 is fixed to the outer wall of the guide cylinder 130. The suspension 123 is a damping spring structure, which has compression deformation and buffering functions. After the support mechanism 100 is placed into the well barrel, the roller 121 contacts the inner wall of the well barrel. At this time, the roller 121 supports the wheel frame 122, the suspension 123, the fixed seat 124 and the guide cylinder 130, and also supports the protective pipe 500 (the guide cylinder 130 supports the protective pipe 500 to maintain the stability of the protective pipe 500).

[0037] In this embodiment, the support mechanism 100 further includes an arc-shaped mounting rod 150. A fixing rod 140 is fixed between the arc-shaped mounting rod 150 and the guide cylinder 130. The fixing rod 140 fixes the arc-shaped mounting rod 150 and the guide cylinder 130 to ensure the stability of the arc-shaped mounting rod 150 and the structure fixed on the arc-shaped mounting rod 150.

[0038] In this embodiment, a fixing block 111 is provided on the inner side of the arc-shaped mounting rod 150. The end of the connecting wire 110 is fixed to the fixing block 111 by bolts. The end of the connecting wire 110 is fixedly connected to another support mechanism 100 by bolts. That is, at least two support mechanisms 100 can be provided in the length direction of the protective pipe. Adjacent support mechanisms 100 are connected by connecting wires 110. The other support mechanism 100 can be used as a counterweight mechanism. The crane lowers the lifting platform 700, the traction wire 210, the counterweight mechanism, and the support mechanism 100. Under the gravity of the counterweight mechanism, the support mechanism 100 and the detection head 300 continue to move downward. The counterweight mechanism can push the connecting wire 110 and push the support mechanism 100 to move downward.

[0039] In this embodiment, as Figure 1 , Figure 4 As shown, the detection head 300 has a probe head 320 at its front end for preventing contact. After the detection head 300 reaches the top of the inclined section, the probe head 320 is used to detect the distance between the detection head 300 and the inner wall of the inclined section. The traction mechanism 400 includes a mounting base 405 fixed to the inner side of the arc-shaped mounting rod 150. A fixing plate 403 is provided inside the mounting base 405. A motor 404 is fixed to one side of the fixing plate 403. The output end of the motor 404 is connected to a winding wheel 402. One end of the pull wire 406 is fixed to the winding wheel 402. A sealing disc 401 is fixed to the end of the mounting base 405. Specifically, the probe 320 uses millimeter-wave radar. After detecting that the probe 300 is about to approach the inclined section, the output shaft of the motor 404 of the traction mechanism 400 drives the reel 402 to rotate. The reel 402 winds the pull wire 406, which pulls the probe 300, causing the probe 300 to rise (a head-up movement, with a head-up range of 30°-45°). During the upward movement of the probe 300, the protective tube 500 is driven (the connection between the protective tube 500 and the probe 300 can be bent to cooperate with the reversing movement of the probe 300). The protective tube 500 is made of rubber and can bend under tension. After the tension is removed, the rubber tube can automatically reset to facilitate the reset of the probe 300.

[0040] It should be noted that, as Figure 2 As shown, there are three mounting rods 150, and each mounting rod 150 has a traction mechanism 400 on its inner wall. The three traction mechanisms 400 are arranged in a triangle. When the winding wheel 402 of one of the traction mechanisms 400 winds the pull wire 406, the other two winding wheels 402 release the pull wire 406. This synchronous winding and releasing action is beneficial to the stability of the detection head 300 and the ability of the detection head 300 to return to its original position after being pulled.

[0041] In this embodiment, as Figure 1 , Figure 2 , Figure 5As shown, another support mechanism 100 can serve as a counterweight mechanism, which also includes a load-bearing mechanism 120. During the synchronous movement of the counterweight mechanism and the support mechanism 100, the load-bearing mechanism 120 acts as a support, and the roller 121 contacts the inner wall of the well shaft and rolls on the inner wall of the roller 121. This facilitates the continuous movement of the counterweight mechanism and the support mechanism 100 within the well shaft without causing any blockage. If there are protruding rocks blocking the way on the inner wall of the well shaft, after the roller 121 contacts the protruding rocks, the roller 121 compresses the suspension 123, causing the suspension 123 to be compressed. The roller 121 can easily pass over the protruding rocks, so that the counterweight mechanism and the support mechanism 100 can easily pass through the obstructed parts of the inner wall of the well shaft.

[0042] In this embodiment, as Figure 1 As shown, it should be noted that the length of the traction steel wire 210 is preset in advance according to the actual length of the well shaft, so that the crane can continuously lower the counterweight mechanism and the support mechanism 100. Continuously lowering the counterweight mechanism and the support mechanism 100 is beneficial for the detection head 300 to reach the horizontal section of the horizontal well.

[0043] In this embodiment, it should be noted that the detection head 300 is fixed to the end of the protective pipe 500 and is used to detect the fluid density inside the well. The detection head 300 is equipped with a sensor. When the detection head 300 enters the well (which is filled with fluid), the fluid comes into contact with the detection head 300. The temperature, pressure, and composition density detection sensors inside the detection head 300 can perform various detections on the fluid. The detected data is transmitted to the controller on the ground via the cable 310, thereby receiving the monitoring data in real time.

[0044] The above-described upward-lifting fluid density testing device includes a traction mechanism 400 located inside the support mechanism 100. The detection head 300 passes through the support mechanism 100, and both move synchronously from the vertical section of the horizontal well to the directional section. When the probe head 320 at the end of the detection head 300 approaches the directional section, the traction mechanism 400 can lift the detection head 300 upward without touching the bottom. This helps to avoid bottomhole fluid accumulation errors when testing fluid density in the wellbore, improves the accuracy of density measurement, and further facilitates accurate judgment of the oil-water interface and production characteristics, supporting refined development and fluid drainage strategy formulation.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An upward-lifting fluid density testing device, characterized in that, include: A support mechanism (100) is used to clamp a portion of the protective pipe (500) inside and to move within the wellbore; the protective pipe (500) is a flexible pipe and a detection head (300) is provided at the lower end of the protective pipe (500). A traction mechanism (400) is mounted on a support mechanism (100) and is used to pull the detection head (300) so that the connection between the protective tube (500) and the detection head (300) is bent.

2. The upward-lifting fluid density testing device according to claim 1, characterized in that, The support mechanism (100) includes a guide cylinder (130) for fitting the protective pipe (500) into it. A plurality of bearing mechanisms (120) are evenly distributed on the outer periphery of the guide cylinder (130). The bearing mechanism (120) is equipped with rollers (121) that can travel on the side wall of the well.

3. The upward-lifting fluid density testing device according to claim 2, characterized in that, The bearing mechanism (120) further includes a fixed seat (124) and a suspension (123). The fixed seat (124) is fixed to the outer wall of the guide cylinder (130) and is arranged along the axial direction of the guide cylinder (130). Suspension (123) is provided at both ends of the fixed seat (124). The two suspensions (123) are inclined towards each other and connected to the wheel frame (122). The wheel frame (122) is rotatably connected to the shaft on the roller (121). The suspension (123) adopts a damping spring structure.

4. The upward-lifting fluid density testing device according to claim 2, characterized in that, The outer wall of the guide cylinder (130) is also provided with an arc-shaped mounting rod (150), the middle part of which is connected to the outer wall of the guide cylinder (130) through a fixing rod (140); the traction mechanism (400) is fixed on the arc-shaped mounting rod (150).

5. The upward-lifting fluid density testing device according to claim 4, characterized in that, At least three arc-shaped mounting rods (150) are evenly distributed around the guide cylinder (130). Each arc-shaped mounting rod (150) is fixed with a traction mechanism (400). The traction mechanism (400) has a retractable pull wire (406). The pull wire (406) is used to connect to the side wall of the detection head (300), and several of the pull wires (406) are evenly distributed around the detection head (300).

6. The upward-lifting fluid density testing device according to claim 5, characterized in that, The traction mechanism (400) also includes a sealing disc (401) and a motor (404), wherein the sealing disc (401) is fixed to the inside of the arc-shaped mounting rod (150); The motor (404) is located inside the sealing disc (401), and a winding wheel (402) is provided on the output end of the motor (404). The pull wire (406) is wound on the winding wheel (402). The sealing disc (401) has a through hole for the pull wire (406) to pass through.

7. The upward-lifting fluid density testing device according to claim 1, characterized in that, At least two support mechanisms (100) are provided along the length of the protective tube (500), and adjacent support mechanisms (100) are connected by a number of connecting steel wires (110).

8. The upward-lifting fluid density testing device according to claim 7, characterized in that, It also includes a lifting platform (700) for connecting to an external crane and for fixed connection to a protective pipe (500).

9. The upward-lifting fluid density testing device according to claim 8, characterized in that, The circumferential connection of the hanging platform (700) is made by a number of traction steel wires (210) and the nearest support mechanism (100).

10. The upward-lifting fluid density testing device according to claim 1, characterized in that, The end of the detection head (300) is also provided with a probe head (320), which is used for distance measurement.

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