A small-diameter formation tester suitable for horizontal well formation testing

Abstract

This utility model relates to the field of oil well detection equipment, specifically a small-diameter formation tester suitable for horizontal well formation testing. It includes a formation detector body, with a guide assembly connected to the outer circumference of the detector body via an elastic component. The guide assembly includes a guide rod perpendicular to the detector body. A rotating disk is hinged to the end of the guide rod furthest from the detector body. The rotating disk is triangular in shape, with its rotation axis perpendicular to both the guide rod and the formation tester's axis. A guide wheel is hinged to each apex of the rotating disk, with its rotation axis perpendicular to the rotating disk. Multiple guide assemblies are evenly distributed on the circumferential side of the detector body, enabling the formation detector to traverse piles of gravel.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a small-diameter formation tester suitable for horizontal well formation testing. Background Technology

[0002] A horizontal well is a casing-equipped well in the oil industry where, after drilling vertically to a certain depth, the drill bit changes direction and extends nearly horizontally for a long distance in the underground reservoir, forming a well with an inclination angle of 90° or close to 90° (generally not less than 86°). For non-fractured reservoirs, horizontal wells produce approximately three times the output of vertical wells; for reservoirs with natural fractures, production can be up to 12 times that of vertical wells; and for water-bearing oilfields, oil and gas recovery rates are significantly higher than with vertical wells.

[0003] Currently, after horizontal well excavation is completed, workers typically use formation testers to probe the well. A relevant Chinese utility model patent, CN217233484U, discloses a small-diameter modular casing well formation tester. This device includes a formation tester body, a sling fixedly connected to the top of the body, a fixing ring circumferentially fitted around the body, a slide cylinder fixedly connected to the side of the fixing ring, a slide rod slidably connected to the slide cylinder, a spring inside the slide cylinder, and a limit plate fixedly connected to an extension plate. A pulley is rotatably connected to the extension plate. During use, when the formation tester body shakes within the well, the pulley contacts the casing and compresses the spring. Simultaneously, the rolling of the pulley keeps the formation tester body in a continuously descending state, thus protecting the formation tester.

[0004] The aforementioned prior art has the following drawbacks: During horizontal well drilling, unremoved gravel forms multiple piles of varying heights on the inner wall of the casing in curved and near-horizontal sections. However, existing pulleys lack the ability to flip or rotate vertically, preventing them from traversing the gravel piles. This can lead to the formation testing instrument getting stuck in the curved and near-horizontal sections of the horizontal well, preventing it from completing its detection tasks. Utility Model Content

[0005] The purpose of this invention is to provide a small-diameter formation tester suitable for horizontal well formation testing, enabling the formation detector to traverse gravel piles, thereby solving the problems mentioned in the background art.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution: A small-diameter formation tester suitable for horizontal well formation testing includes a formation detector body. A guide assembly is connected to the outer circumference of the formation detector body via an elastic component. The guide assembly includes a guide rod perpendicular to the formation detector body. A rotating disk is hinged to the end of the guide rod away from the formation detector body. The rotating disk is triangularly arranged, with its rotation axis perpendicular to the guide rod and the axis of the formation tester. A guide wheel is hinged to each apex of the rotating disk, with its rotation axis perpendicular to the rotating disk. Multiple guide assemblies are evenly distributed on the circumferential side of the detector body.

[0007] As a preferred embodiment of this invention, the number of guiding components is six, and the six guiding components are divided into two groups of three, with the two groups of guiding components located at both ends of the formation detector.

[0008] In a preferred embodiment of this invention, the number of elastic components is equal to the number of guiding components, and the elastic components and guiding components correspond one-to-one.

[0009] As a preferred embodiment of the present invention, each of the elastic components includes a connecting cylinder fixedly connected to the formation detector body, a spring disposed in the connecting cylinder, the spring being fixedly connected to the formation connector body, a guide rod being inserted into the connecting cylinder, and the guide rod being fixedly connected to the spring.

[0010] As a preferred embodiment of this utility model, the cross-section of the connecting cylinder is square, the shape of the guide rod matches the shape of the connecting cylinder, and after the guide rod is inserted into the connecting cylinder, the side wall of the guide rod abuts against the inner wall of the connecting cylinder.

[0011] In a preferred embodiment of this invention, the end of the guide rod furthest from the body of the formation detector is provided with a connecting hole, through which a rotating shaft is inserted. Each end of the rotating shaft corresponds to a flip disk, and the two flip disks are parallel to each other. Each end of the rotating shaft is provided with two nuts, which are threadedly connected to the rotating shaft. The rotating shaft passes through the flip disk, and the flip disk is fixedly connected to the rotating shaft through the nuts. Beneficial effects

[0012] The beneficial effects of this utility model are: When in use, multiple guiding components simultaneously abut against the inner wall of the casing of the horizontal well. As the formation detector body moves, the guide wheel rolls synchronously with the descent of the formation detector. When there is a pile of gravel on the inner wall of the casing, due to the triangular design of the rotating disc, when a single guide wheel is obstructed, the rotating disc flips under the support of the rotating shaft. The guide wheels on the rotating disc contact the pile of gravel one by one and gradually climb up as the disc rotates. The elastic component undergoes elastic deformation during the climbing process, allowing the rotating disc to successfully complete the step of overcoming the pile of gravel. After overcoming the pile of gravel, the elastic component pushes the rotating disc back to the state of contact with the inner wall of the casing, thereby reducing the impact of the pile of gravel in the casing on the use of the guide wheels. This reduces the occurrence of the formation detector body getting stuck in the curved or near-horizontal well sections of the horizontal well due to the use of the guide wheels. Furthermore, the constraint of the guiding component on the formation detector allows the formation detector to move in the middle position of the casing in the horizontal well, that is, the axis of the bottom detector coincides with the axis of the casing. In combination, this not only achieves the effect of enabling the formation detector to overcome the pile of gravel, but also makes the movement of the formation detector body in the casing smoother. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure during use; Figure 2 To illustrate the structural diagram of the elastic component; Figure 3 To illustrate the structural diagram at the end of a single guide rod; Figure 4 This is a schematic diagram showing the top-down view of the formation tester during use.

[0015] The attached diagram lists the components represented by each number as follows: 1. Formation detector body; 2. Guiding assembly; 21. Guide rod; 22. Tilting disk; 23. Guide wheel; 3. Elastic assembly; 31. Connecting cylinder; 32. Spring; 4. Connecting hole; 41. Rotating shaft; 42. Nut. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] See Figure 1-4 As shown, a small-diameter formation tester suitable for horizontal well formation testing includes a cylindrical formation detector body 1. The formation detector body 1 is connected to a guide assembly 2. There are six guide assemblies 2. The six guide assemblies 2 are divided into two groups of three. The two groups of guide assemblies 2 are located at both ends of the formation detector. Each group of guide assemblies 2 is evenly distributed on the circumferential side of the detector body.

[0018] See Figure 1-4 As shown, each guide component 2 includes a guide rod 21, which is perpendicular to the formation detector body 1. The end of the guide rod 21 away from the formation detector body has a connection hole 4, through which a rotating shaft 41 is inserted. Two triangular rotating disks 22 are respectively connected to the two ends of the rotating shaft 41. The two rotating disks 22 are parallel to each other. Each end of the rotating shaft 41 is provided with two nuts 42, which are threadedly connected to the rotating shaft 41. The rotating shaft 41 passes through the rotating disk 22, and the rotating disk 22 is fixedly connected to the rotating shaft 41 through the nuts 42. The rotation axis 41 of the rotating disk 22 is perpendicular to the guide rod 21 and the rotation axis 41 of the rotating disk 22 is perpendicular to the axis of the formation detector. Each apex of the rotating disk 22 is hinged with a guide wheel 23, and the rotation axis 41 of the guide wheel 23 is perpendicular to the rotating disk 22.

[0019] See Figure 1-4 As shown, the formation detection body is equipped with elastic components 3, the number of which is equal to the number of guide components 2. Each elastic component 3 corresponds one-to-one with a guide component 2, and each guide component 2 is connected to the formation detection body via an elastic component 3. Each elastic component 3 includes a connecting cylinder 31 fixedly connected to the formation detector body 1. The connecting cylinder 31 has a square cross-section and contains a spring 32, which is fixedly connected to the formation connector body. The shape of the guide rod 21 matches the shape of the connecting cylinder 31. After the guide rod 21 is inserted into the connecting cylinder 31, it is fixedly connected to the spring 32, and the side wall of the guide rod 21 abuts against the inner wall of the connecting cylinder 31.

[0020] One specific application of this embodiment is: During operation, the formation detector body 1 descends along the casing, with the suspension rope providing traction. Guide wheels 23 abut against the inner wall of the casing. Six guide wheels 23 ensure that the axis of the formation detector body 1 is collinear with the axis of the casing. A square-section guide rod 21 and a connecting cylinder 31 restrain the guide wheels 23, preventing them from rotating and causing the formation detector body to become stuck in the casing, thus maintaining a smooth descent of the formation detector body 1.

[0021] When the formation detector body 1 moves to the curved section of the horizontal well, the guide wheel 23 contacts the accumulated gravel pile. Since the tilting disc 22 is triangularly designed, when a single guide wheel 23 encounters obstruction, the tilting disc 22, supported by the rotating shaft 41, tilts. The guide wheels 23 on the tilting disc 22 contact the gravel pile one by one and gradually rise as the disc rotates. During the tilting disc 22's ascent, the elastic component 3 undergoes elastic deformation, allowing the tilting disc 22 to successfully complete the step of tilting over the gravel pile. After tilting over the gravel pile, the elastic component 3 pushes the tilting disc 22 back to its state of contact with the inner wall of the casing. In summary, through the above steps, the formation detector body 1 achieves the ability to tilt over gravel piles.

[0022] Of course, the above description is not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, alterations, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A small-diameter formation tester suitable for horizontal well formation testing, comprising a formation detector body (1), characterized in that: The formation detector body (1) is connected to a guide assembly (2) via an elastic component (3) on its outer circumference. The guide assembly (2) includes a guide rod (21) that is perpendicular to the formation detector body (1). A rotating disk (22) is hinged at the end of the guide rod (21) away from the formation detector body (1). The rotating disk (22) is triangular in shape. The rotation axis (41) of the rotating disk (22) is perpendicular to the guide rod (21) and the rotation axis (41) of the rotating disk (22) is perpendicular to the axis of the formation tester. A guide wheel (23) is hinged at each apex of the rotating disk (22). The rotation axis (41) of the guide wheel (23) is perpendicular to the rotating disk (22). Multiple guide assemblies (2) are provided and are evenly distributed on the circumferential side of the detector body.

2. The small-diameter formation tester for horizontal well formation testing according to claim 1, characterized in that: The number of the guiding components (2) is six. The six guiding components (2) are divided into two groups of three, and the two groups of guiding components (2) are located at both ends of the formation detector.

3. A small diameter formation tester suitable for use in formation testing of a horizontal well, according to claim 2, characterized by: The number of elastic components (3) is equal to the number of guide components (2), and the elastic components (3) and guide components (2) correspond one-to-one.

4. A small diameter formation tester suitable for use in formation testing of a horizontal well according to claim 3, characterized in that: Each of the elastic components (3) includes a connecting cylinder (31) fixedly connected to the formation detector body (1), a spring (32) is provided in the connecting cylinder (31), the spring (32) is fixedly connected to the formation connector body, a guide rod (21) is inserted into the connecting cylinder (31), and the guide rod (21) is fixedly connected to the spring (32).

5. A small diameter formation tester suitable for use in formation testing of a horizontal well, according to claim 4, characterized by: The cross-section of the connecting cylinder (31) is square. The shape of the guide rod (21) matches the shape of the connecting cylinder (31). After the guide rod (21) is inserted into the connecting cylinder (31), the side wall of the guide rod (21) abuts against the inner wall of the connecting cylinder (31).

6. A small diameter formation tester suitable for use in formation testing of a horizontal well according to claim 1, characterized by: The guide rod (21) has a connection hole (4) at the end away from the stratum detector body. A rotating shaft (41) is inserted through the connection hole (4). Each end of the rotating shaft (41) corresponds to a flip disk (22). The two flip disks (22) are parallel to each other. Each end of the rotating shaft (41) is provided with two nuts (42). The nuts (42) are threadedly connected to the rotating shaft (41). The rotating shaft (41) passes through the flip disk (22). The flip disk (22) is fixedly connected to the rotating shaft (41) through the nuts (42).

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