A cable-pumped formation stratification pressure-sampling device

Abstract

The utility model relates to the field of petroleum exploration equipment, a cable pump extraction type formation layering pressure measuring sampler, including the pole body, the pole body outside upper from below to above are sequentially provided with eddy current part, righting part and wake part, reach guarantee pole body in the process of falling, pole body is in the state of collinear with the axis of well casing, prevent the effect that pole body inclines and is stuck in the casing well.

Description

Technical Field

[0001] This utility model relates to the field of petroleum exploration equipment technology, specifically to a cable pump-type formation stratification pressure sampling device. Background Technology

[0002] Cable formation testing is a commonly used method in oil exploration and development. It provides reliable data on reservoir fluid properties, physical characteristics, and energy levels, facilitating the planning and implementation of subsequent oil extraction operations. Cable formation testing is currently an indispensable key project in the oil exploration industry.

[0003] The cable-assisted formation testing method mainly relies on a cable pump-type formation pressure sampling device. A relevant reference is Chinese utility model patent published on July 23, 2008, with publication number CN201090212Y, which discloses a cable pump-type formation sampling device for casing wells. This device includes a surface operation control mechanism and a formation sampling rod. The surface operation control mechanism mainly consists of a pressure regulating cabinet, a booster cabinet, a control cabinet, and a computer. The formation sampling rod structure includes a rod body, which is divided from top to bottom into a bridle, an electronic joint unit, a pressure balancing unit, a hydraulic joint unit, a suction pump unit, and a packer unit. The rod body is elongated and connected to the surface control unit via a cable. The cable transmits control signals from the surface control unit to the rod body, and the corresponding part of the rod body executes the commands. Simultaneously, sensors installed on the rod body also transmit the collected formation information to the surface operation control mechanism via electrical signals through the cable. During operation, workers first use a logging winch to hoist the rod into the casing well, which is filled with well fluid to prevent collapse. The rod is then immersed in the fluid. The rod is gradually moved to the reservoir by the well winch. Once the suction pump unit inside the rod reaches the reservoir, the packer unit sets the seal, and then the suction pump unit begins sampling. Various sensors on the rod transmit the received signals to the surface control system. After sampling is completed, the well winch lifts the rod out of the casing well, and workers retrieve the samples extracted by the suction pump unit.

[0004] The aforementioned prior art has the following drawbacks: Since a casing well in the field is composed of multiple casings spliced ​​together, misalignment of the casings during the splicing process is inevitable. This can cause the rod to collide with the casing during descent, resulting in the rod tilting inside the casing (an angle of inclination between the rod and the casing axis). A rod tilted inside the casing not only makes it impossible to perform the correct inspection process, but also easily leads to inspection accidents where the rod gets stuck in the casing well. Utility Model Content

[0005] The purpose of this utility model is to provide a cable pump-type formation stratified pressure sampling device that ensures that the rod is collinear with the axis of the well casing during the descent process, preventing the rod from tilting and getting stuck in the casing well, 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 cable pump-type formation pressure sampling device includes a rod body, which is divided into a bridle, an electronic joint unit, a pressure balancing unit, a hydraulic joint unit, a suction pump unit, and a packer unit from top to bottom. The outer side of the rod body is arranged from bottom to top as follows: a vortex section, a centralizing section, and a wake section. The vortex section includes a vortex frame fixedly connected to the end of the rod body, with a vortex shaft rotatably connected within the frame. The axis of the vortex shaft is collinear with the axis of the rod body, and vortex generating blades are fixedly connected to the circumferential side of the vortex shaft. The centralizing section includes a centralizing ring sleeved on the rod body, with a connecting rod fixedly connected to the centralizing ring. The connecting rod is configured with... There are multiple abutment rods evenly arrayed along the straightening ring. Each abutment rod is perpendicular to the rod body. A straightening cavity is opened in the end of the abutment rod facing the rod body. A straightening spring is fixedly connected in the straightening cavity. A straightening rod is fixedly connected to the straightening spring. The end of the straightening rod away from the straightening spring abuts against the rod body. An abutment wheel is rotatably connected to the end of the abutment rod away from the straightening rod. The rotation axis of the abutment wheel is perpendicular to the abutment rod. The wake section includes wake rods. Multiple wake rods are arranged radially around the rod body. A stabilizing rod assembly is connected to the end of each wake rod away from the rod body. The stabilizing rod assembly keeps the rod body in a stable downward state.

[0007] As a preferred embodiment of the present invention, the stabilizer assembly includes a stabilizer plate, a stabilizer hole is provided on the stabilizer plate facing the rod body, a stabilizer spring is fixedly connected in the stabilizer hole, and the wake rod is inserted into the stabilizer hole and fixedly connected to the stabilizer spring.

[0008] As a preferred embodiment of this utility model, a following groove is provided on the side of the stabilizing plate away from the rod, and a following wheel is tumblingly connected in the following groove, and the following wheel tumbling in the following groove.

[0009] As a preferred embodiment of this invention, multiple straightening parts are provided, and the multiple straightening parts are evenly distributed along the rod.

[0010] In a preferred embodiment of this invention, a mating hole is provided at the position of the rod body facing the straightening rod, the straightening rod is inserted into the mating hole, the cross-section of the straightening rod is elliptical, and the cross-sectional shape of the mating hole matches the straightening rod. Beneficial effects

[0011] The beneficial effects of this utility model are: As the rod descends into the casing filled with well fluid, it propels the vortex generator blades within the fluid. The blades then rotate around the rod, causing the fluid around the rod to change from a static state to a state of vortex-like rotation. This rotation generates a centripetal force, which acts on the rod, ensuring it remains aligned with the well casing axis. This initially guarantees that the rod remains collinear with the casing axis during its descent, preventing it from tilting and becoming stuck in the casing. During the descent of the rod, the abutment wheel rolls against the wellbore wall. When the wellbore deviates from its course, the abutment wheel transmits the deviation to the centering spring via the abutment rod. The elastic force generated by the elastic deformation of the centering spring acts on the centering rod, adjusting the position of the rod and restoring it to a descent state aligned with the wellbore's axis. This further ensures that the rod remains collinear with the wellbore's axis during descent, preventing it from tilting and getting stuck in the wellbore. The wake section provides adjustment for the rod's tail during the centering adjustment, preventing the tail from swaying due to the centering adjustment and generating inertial forces detrimental to rod stability. This further ensures that the rod remains collinear with the wellbore's axis during descent, preventing it from tilting and getting stuck in the wellbore. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram illustrating the overall structure of the rod entering the casing well; Figure 2 A schematic diagram of the vortex section is shown separately; Figure 3 To omit the internal structure of the pole, a structural diagram of a single straightening section is shown. Figure 4 The diagram shows the structure of the wake section after omitting the internal structure of the rod.

[0014] The attached diagram lists the components represented by each number as follows: 1. Rod body; 11. Bridle; 12. Electronic joint unit; 13. Pressure balance unit; 14. Hydraulic joint unit; 15. Suction pump unit; 16. Packer unit; 2. Vortex section; 21. Vortex frame; 22. Vortex shaft; 23. Vortex generating blade; 3. Centralizing section; 31. Centralizing ring; 32. Centralizing rod; 33. Centralizing cavity; 34. Centralizing spring; 35. Abutment rod; 36. Abutment wheel; 351. Mating hole; 4. Wake section; 41. Wake rod; 42. Stabilizer assembly; 421. Stabilizer plate; 422. Stabilizer hole; 423. Stabilizer spring; 5. Follower groove; 51. Follower wheel. Detailed Implementation

[0015] 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.

[0016] See Figure 1-2 As shown, a cable pump-type formation stratified pressure sampling device includes a ground control operating mechanism. The ground control operating mechanism is connected to a long rod 1 via a cable. The rod 1 is divided into a bridle 11, an electronic joint unit 12, a pressure balancing unit 13, a hydraulic joint unit 14, a suction pump unit 15, and a packer unit 16 from top to bottom. During exploration, workers use a well winch and cable to suspend the rod 1 into the casing well.

[0017] See Figure 1 As shown, the outer side of the rod 1 is provided with a vortex section 2, a straightening section 3 and a wake section 4 from bottom to top.

[0018] See Figure 1-4 As shown, the vortex section 2 includes an annular vortex frame 21, the axis of which is collinear with the axis of the rod 1. The vortex frame 21 is fixedly connected to the end of the rod 1 near the packer unit 16. A vortex shaft 22 is rotatably connected within the vortex frame 21, the axis of which is collinear with the axis of the rod 1. A vortex generating blade 23 is fixedly connected to the circumferential side of the vortex shaft 22, and the vortex generating blade 23 is a propeller blade. When the rod 1 descends in the casing well, it provides propulsion to the vortex section 2. The vortex generating blade 23 rotates under the support of the vortex shaft 22. After the vortex rotates, it drives the well fluid around the rod 1 to rotate in a vortex. The centripetal force generated by the rotating well fluid acts on the rod 1, causing the rod 1 to descend along the casing well while maintaining its alignment with the axis of the casing well.

[0019] See Figure 1-4As shown, multiple straightening parts 3 are provided, and the multiple straightening parts 3 are evenly distributed along the rod body 1. Each straightening part 3 includes a circular straightening ring 31, which is sleeved on the rod body 1. The straightening ring 31 is fixedly connected to an abutment rod 35. Multiple abutment rods 35 are provided, preferably an even number, and the number of abutment rods 35 is not less than four. The multiple abutment rods 35 are evenly arrayed along the straightening ring 31. Each abutment rod 35 is perpendicular to the rod body 1. A straightening cavity 33 is opened in the end of the abutment rod 35 facing the rod body 1. A straightening spring 34 is fixedly connected in the straightening cavity 33. A straightening rod 32 is fixedly connected to the straightening spring 34. The position of the rod body 1 facing the straightening rod 32 is... A mating hole 351 is provided at the position, and the straightening rod 32 is inserted into the mating hole 351. The cross-section of the straightening rod 32 is elliptical, and the cross-sectional shape of the mating hole 351 matches that of the straightening rod 32. An abutment wheel 36 is rotatably connected to the end of the abutment rod 35 away from the straightening rod 32. The rotation axis of the abutment wheel 36 is perpendicular to the abutment rod 35. After the rod 1 enters the casing well, multiple abutment wheels 36 abut against the well wall of the casing well, thereby providing a constraint force on the rod 1, so that when the rod 1 enters the well body part where the displacement occurs, the rod 1 remains in a state of being coincident with the axis of the well body.

[0020] See Figure 1-4 As shown, the wake section 4 includes a long, narrow wake rod 41. Multiple wake rods 41 are provided, preferably an odd number, and no fewer than three. The multiple wake rods 41 are arranged radially around the rod body 1. Each wake rod 41 has a stabilizing assembly 42 connected to its end furthest from the rod body 1. The stabilizing assembly 42 abuts against the well wall of the casing well. The multiple stabilizing assemblies 42 provide constraint to the rod body 1 through the wake rods 41, reducing swaying of the rod body 1. The stabilizer assembly 42 includes a long stabilizer plate 421. A stabilizer hole 422 is provided on the stabilizer plate 421 facing the rod body 1. A stabilizer spring 423 is fixedly connected in the stabilizer hole 422. The wake rod 41 is inserted into the stabilizer hole 422 and fixedly connected to the stabilizer spring 423. A follower groove 5 is provided on the side of the stabilizer plate 421 away from the rod body 1. A follower wheel 51 is slidably connected in the follower groove 5 and rolls in the follower groove 5.

[0021] One specific application of this embodiment is: During the inspection, the well winch hoists use cables to lift rod 1 to the casing well. Rod 1 then gradually enters the casing well, with the vortex section 2 entering first. As rod 1 continues to descend, the vortex generator 23 rotates around the vortex axis 22. The well fluid in the casing well undergoes vortex rotation under the action of the vortex generator 23, generating a centripetal force that acts on rod 1, keeping it aligned with the casing well's axis. As rod 1 gradually enters the casing well, the centering section 3 also enters, with the abutment wheel 36 contacting the inner wall of the casing well. The abutment wheel 36 rotates synchronously with rod 1 as it falls. The abutment rod 35 and centering rod 32 restrain rod 1, ensuring that it remains aligned with the casing well's axis during its descent. After the tail section 4 enters the casing well, it follows the wheel 51 and abuts against the inner wall of the casing well. When the tail of the rod 1 begins to sway, the stabilizing spring 423 restricts the tail of the rod 1, causing the tail to stop swaying for a short time. In summary, through the above steps, it is ensured that the rod 1 is collinear with the axis of the casing during its descent, preventing the rod 1 from tilting and getting stuck in the casing well.

[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 cable pump-type stratification pressure sampling device, comprising a rod (1), the rod (1) being divided from top to bottom into a bridle (11), an electronic section unit (12), a pressure balancing unit (13), a hydraulic section unit (14), a suction pump unit (15), and a packer unit (16), characterized in that: The outer side of the rod (1) is provided with a vortex section (2), a straightening section (3), and a wake section (4) in sequence from bottom to top; the vortex section (2) includes a vortex frame (21), which is fixedly connected to the end of the rod (1), and a vortex shaft (22) is rotatably connected in the vortex frame (21). The axis of the vortex shaft (22) is collinear with the axis of the rod (1), and a vortex generating blade (23) is fixedly connected to the circumferential side of the vortex shaft (22); the straightening section (3) includes a straightening ring (31), which is sleeved on the rod (1). The straightening ring (31) is fixedly connected to abutment rods (35), and multiple abutment rods (35) are provided. The multiple abutment rods (35) are evenly arrayed along the straightening ring (31), and each abutment rod (35) is perpendicular to the rod (1). 5) A straightening cavity (33) is provided in the end facing the rod (1). A straightening spring (34) is fixedly connected in the straightening cavity (33). A straightening rod (32) is fixedly connected to the straightening spring (34). The end of the straightening rod (32) away from the straightening spring (34) abuts against the rod (1). The end of the abutting rod (35) away from the straightening rod (32) is rotatably connected to the abutting wheel (36). The rotation axis of the abutting wheel (36) is perpendicular to the abutting rod (35). The wake section (4) includes a wake rod (41). Multiple wake rods (41) are provided. Multiple wake rods (41) are arranged radially with the rod (1) as the center. Each wake rod (41) is connected to a stabilizing rod assembly (42) at the end away from the rod (1). The stabilizing rod assembly (42) keeps the rod (1) in a stable downward state.

2. The cable pump-type stratified pressure sampling device for ground formation according to claim 1, characterized in that: The stabilizer assembly (42) includes a stabilizer plate (421), a stabilizer hole (422) is provided on the stabilizer plate (421) facing the rod body (1), a stabilizer spring (423) is fixedly connected in the stabilizer hole (422), and the wake rod (41) is inserted into the stabilizer hole (422) and fixedly connected to the stabilizer spring (423).

3. The cable pump-driven stratification pressure sampling device according to claim 2, characterized in that: The stabilizing plate (421) has a following groove (5) on the side away from the rod (1), and a following wheel (51) is tumbling in the following groove (5).

4. The cable pump-type stratified pressure sampling device for ground formation according to claim 3, characterized in that: The straightening part (3) is provided in multiple ways, and the multiple straightening parts (3) are evenly distributed along the rod (1).

5. A cable pump-type stratification pressure sampling device for ground formations according to claim 4, characterized in that: The rod (1) has a mating hole (351) at the position facing the straightening rod (32). The straightening rod (32) is inserted into the mating hole (351). The cross-section of the straightening rod (32) is elliptical, and the cross-sectional shape of the mating hole (351) matches that of the straightening rod (32).

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