Angle-adjustable packer test device and test method

Abstract

The invention provides an angle-adjustable packer testing device which comprises a frame, a movable plate arranged on the frame, an inner pipe joint arranged on the movable plate, and a sleeve arranged on the frame and used for receiving a packing mechanism, an adjusting clamp used for fixing the sleeve is arranged on the frame, and the inner pipe joint is arranged on the movable plate. The adjusting clamp can enable bending deformation of the casing pipe to simulate a well bore structure.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and particularly relates to an adjustable angle packer test device and a test method. Background Art

[0002] The packer mainly realizes the sealing of the annulus between the oil casing and the gas casing, and is widely used in engineering applications such as drilling, completion, and cementing, and can perform operations such as production, water injection (gas), and interlayer sealing.

[0003] However, there are many assumptions in the existing mechanical analysis model of the packer under high temperature and high pressure, resulting in a large difference between the calculated value and the true value, and it is impossible to accurately reflect the mechanical behavior of the packer, resulting in an unclear failure mechanism. Therefore, experimental research has become an important way to promote the continuous improvement of the theoretical model and obtain the true dynamic behavior of the packer. The existing test devices only consider the setting of the packer in a straight wellbore, while ignoring the influence of the wellbore structure with different well inclination angles and azimuth angles on the mechanical behavior of the packer, as well as the research on the sealing effect of the packer under dynamic load conditions after the packer is set.

[0004] Therefore, in this field, it is desirable to provide an adjustable angle packer test device to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an adjustable angle packer test device, which can simulate the setting process of the packer with different well inclination angles and azimuth angles in a small range.

[0006] According to a first aspect of the present invention, there is provided an adjustable angle packer test device, including a frame, on which a moving plate is provided,

[0007] an inner pipe joint provided on the moving plate, and

[0008] a casing provided on the frame and used for receiving a packing mechanism,

[0009] wherein, an adjusting clamp for fixing the casing is provided on the frame, and the adjusting clamp can bend and deform the casing to simulate the wellbore structure.

[0010] In one embodiment, a plurality of spaced-apart adjusting clamps are arranged along the axial direction of the frame.

[0011] In one embodiment, a first sealed end covering the packing mechanism and forming a sealed connection with the casing is provided below the inner pipe joint.

[0012] In one embodiment, a ball screw is provided on the frame, and the adjustable angle packer test device further includes a driving member connected to the ball screw, and the driving member is configured to be able to adjust the axial position of the moving plate to simulate the lowering process of the packing mechanism.

[0013] In one embodiment, the packing mechanism includes an inner pipe, a protective sleeve disposed below the inner pipe, and a slider hermetically sleeved outside the inner pipe and abutting against the protective sleeve.

[0014] In one embodiment, the adjustable angle packer test device further includes a hydraulic pump communicating with the side wall of the inner pipe joint and used for injecting liquid, and through holes allowing the liquid to flow into the annulus between the inner pipe and the casing are provided on the outer wall of the inner pipe.

[0015] In one embodiment, the packing assembly includes a packing rubber cylinder, cones disposed at both ends of the packing rubber cylinder, and a first slip and a second slip respectively adapted to the two cones. Among them, the second slip is fixedly connected to the cone through a shear pin in an initial state.

[0016] In one embodiment, the packing mechanism further includes a base disposed below the first slip.

[0017] The adjustable angle packer test device further includes a second sealed end disposed at the bottom of the casing and connected to the base.

[0018] In one embodiment, a sheath is provided between the first slip and the base.

[0019] According to a second aspect of the present invention, a test method is provided, which uses the adjustable angle packer test device as described above, and includes the following steps:

[0020] S1. Bend and deform the casing by adjusting the fixture to simulate the wellbore structure.

[0021] S2. Adjust the axial position of the moving plate through the driving member to urge the packing mechanism to be lowered to a predetermined position inside the casing until a sealed connection is formed between the casing and the first sealed end.

[0022] S3. Inject liquid into the inner pipe joint through the hydraulic pump, and the liquid flows through the through hole into the annulus between the inner pipe and the casing under the pressure buildup to urge the slider to descend, thereby allowing the first slip, the packing rubber cylinder, and the second slip to seal the casing in sequence.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] First, the device can simulate the process of setting and running in of packers with different well deviation angles and azimuth angles in a small range. In addition, the casing in the device includes a vertical section and a bent section, so that the movement state of the packing mechanism during the running-in process can be more easily observed, further meeting the setting tests of the packing mechanism in the vertical well section and the deviated well section.

[0025] Second, the device can provide dynamic loads to the packing mechanism after setting, which is conducive to studying the mechanical behavior of the packing mechanism from running in to setting and then after setting. In this way, the accuracy and authenticity of the simulation data of the device can be improved, so as to provide real technical support for the hypothesis of the mechanical analysis model of the packer, and then accurately reflect the mechanical behavior of the packer to clarify its failure mechanism. In addition, this application has the characteristics of simple operation, easy implementation and multiple functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in detail below with reference to the drawings. In the drawings:

[0027] Figure 1 Schematically shows the structure of the adjustable angle packer test device according to the present invention.

[0028] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. And without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0031] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements.

[0032] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Figure 1 Schematically shows the structure of the adjustable angle packer test device 100 according to the present invention.

[0035] As Figure 1 shown, according to the first aspect of the present invention, an adjustable angle packer test device 100 mainly includes a frame 10 and a moving plate 11 disposed on the frame 10. Preferably, the frame includes two fixed struts, namely the first strut 101 and the second strut 102; the first strut 101 is a long strut and serves as the main support structure of the device, while the second strut 102 is a short strut, and ball screws 15 are provided in both struts (i.e., the first strut 101 and the second strut 102).

[0036] Preferably, the ball screw 15 is slidably connected to the strut. Therefore, in the present invention, by adjusting the relative position of the ball screw 15 and the second strut 102, since the moving plate 11 is mounted on the ball screw 15, the moving plate 11 can be smoothly controlled by the ball screw 15 to have the ability to adjust its axial position, which is beneficial to simulating the whole process of the packer mechanism (introduced below) being inserted into the casing 13.

[0037] Preferably, as Figure 1 shown, a fixing plate 103 is provided at the top of the frame 10 and is respectively connected to the first strut 101 and the second strut 102 to further improve the stability and firmness of the frame 10.

[0038] In one embodiment, as Figure 1 shown, a support plate 31 is provided on the frame 10 below the moving plate 11, and the adjustable angle packer test device 100 further includes a driving member provided on the frame 10. Preferably, the driving member can control the axial movement of the ball screw 15 to further adjust the axial position of the moving plate 11.

[0039] In the present invention, the driving member mainly consists of a motor 32 and a synchronous pulley 33. Among them, the motor 32 is fixedly installed on the support plate 31, and the synchronous pulley 33 is sleeved outside the second strut 102 and connected to the ball screw 15 to drive the ball screw 15 to rotate.

[0040] In the present invention, as Figure 1As shown, a timing belt 34 is provided between the motor 32 and the synchronous pulley 33. Thus, through the forward and reverse rotation of the motor 32, the ball screw 15 can be rotated relative to the second support column 102, thereby achieving the purpose of adjusting the axial position of the support plate 31, which is beneficial to simulating the lowering process of the packer mechanism, and its content will be introduced below.

[0041] Preferably, as Figure 1 shown, sliding bearings 17 are respectively sleeved on the first support column 101 and the second support column 102, and the sliding bearings 17 are located above the support plate 31, so as to ensure that the support plate 31 can accurately complete the lifting work.

[0042] According to the present invention, as Figure 1 shown, the adjustable angle packer test device 100 further includes a casing 13 provided on the frame 10. Preferably, a plurality of adjusting clamps 14 are provided on the frame 10, and the plurality of adjusting clamps 14 are spaced along the axial direction of the frame 10, so as to accurately control a plurality of different positions of the casing 13. Therefore, by changing the lateral positions of different adjusting clamps 14 (the adjusting clamps 14 perform telescopic actions), the casing 13 can be bent and deformed to simulate different wellbore structures.

[0043] Preferably, the plurality of adjusting clamps 14 are respectively fixedly installed on the first support column 101 and the second support column 102, so as to effectively limit the axial position of the adjusting clamps 14 and further improve the stability and firmness of the adjusting clamps 14.

[0044] In the present invention, the casing 13 generally includes a vertical section and a bent section after being bent and deformed. Therefore, in this way, small-range changes in well inclination angle and azimuth angle can be achieved, so as to accurately simulate the lowering and setting processes of the packer under different wellbore structures.

[0045] In one embodiment, as Figure 1 shown, the adjustable angle packer test device 100 further includes an inner pipe joint 12 fixedly installed below the moving plate 11. A packer mechanism is provided below the inner pipe joint 12. Preferably, in the initial state, there is a large distance between the moving plate 11 and the casing 13, so that the packer mechanism can be located above the casing 13, and through the driving action of the motor 32 and the ball screw 15, the moving plate 11 is lowered until the packer mechanism enters the casing 13, so as to smoothly simulate the working process of the packer mechanism lowering into the casing 13.

[0046] In one embodiment of the present invention, as Figure 1As shown, a first sealing end 121 covering the packer mechanism is provided below the inner pipe joint 12. Preferably, when the packer mechanism is lowered to a predetermined position within the casing 13, the first sealing end 121 will form a sealed connection with the upper end face of the casing 13, thereby providing an effective sealed space for the subsequent setting process of the packer.

[0047] In one embodiment, as Figure 1 shown, a base 27 is provided on the inner side of the bottom of the casing 13, and the adjustable angle packer test device 100 further includes a second sealing end 122 fixedly connected to the base 27. Therefore, after the first sealing end 121 is sealedly connected to the casing 13, the interior of the casing 13 will be constructed as a sealed chamber, thereby effectively avoiding interference from the external environment during the setting process of the simulated packer and improving the authenticity and effectiveness of the simulation data.

[0048] In one embodiment, as Figure 1 shown, the adjustable angle packer test device 100 further includes a hydraulic pump 16. The hydraulic pump 16 is communicated with the side wall of the inner pipe joint 12 through a pipeline configured in an L shape, so as to be able to inject high-temperature liquid into the inner pipe joint 12 to carry out the setting process of the simulated packer.

[0049] According to the present invention, as Figure 1 shown, the packer mechanism includes an inner pipe 21, a protective sleeve 22 provided below the inner pipe 21, and a slider 23 sleeved outside the inner pipe 21 and axially connected to the protective sleeve 22. Preferably, a plurality of through holes allowing high-pressure liquid to pass through are provided on the outer wall of the inner pipe 21.

[0050] In other words, due to the presence of the first sealing end 121 and the second sealing end 122, the interior of the casing 13 is constructed as a sealed chamber. Therefore, after the high-temperature liquid is injected, a pressure buildup will be formed inside the casing 13 to cause the high-temperature liquid to flow through the through holes into the annulus between the inner pipe 21 and the casing 13, thereby being able to push the slider 23 and the protective sleeve 22 to move downward synchronously to carry out the setting work of the packer.

[0051] In the present invention, as Figure 1 shown, the packer assembly consists of three parts. Among them, the first part is the first slip 25 at the lower part, the second part is the packer rubber element in the middle, and the third part is the second slip 26 at the upper part. Preferably, cones, namely a first cone 251 and a second cone 261, are provided at both ends of the packer rubber element. At the same time, the first slip 25 is fixedly installed on the first cone 251, and the second slip 26 is fixedly installed on the second cone 261.

[0052] Preferably, the second slip 26 is fixed to the second cone 261 by shear pins in the initial state to prevent premature opening during the setting process.

[0053] In the present invention, the setting operation of the packer is divided into two stages, which will be specifically introduced below.

[0054] First stage: The high-temperature liquid flows through the through-hole into the annulus between the inner pipe 21 and the casing 13, thereby successively pushing the slider 23 and the protective sleeve 22 downward, and further pushing the second slip 26 and the packer rubber barrel downward, so as to cause the first slip 25 to expand outward under the action of the first cone 251 and embed on the inner wall of the casing 13.

[0055] Second stage: Continue to inject the high-temperature liquid, and the shear pin is cut off under the action of the extrusion force. The packer rubber barrel moves outward and radially abuts against the casing 13. At the same time, the second slip 26 expands outward under the action of the second cone 261 and embeds on the inner wall of the casing 13, thereby completing the entire setting operation.

[0056] In the present invention, as Figure 1 shown, the packer rubber barrel includes a first rubber barrel 241 and a second rubber barrel 242 separated by a spacer ring 243. Among them, the first rubber barrel 241 axially abuts against the first cone 251, and a shoulder 244 is provided between the second rubber barrel 242 and the second cone 261. Therefore, under the action of the shoulder 244 and the spacer ring 243, it can ensure that the first rubber barrel 241 and the second rubber barrel 242 successfully complete the setting operation, so as to further improve the accuracy of the simulation data.

[0057] According to the second aspect of the present invention, a test method is provided, which uses the adjustable-angle packer test device 100 as described above, and includes the following steps:

[0058] First, fixedly install the packing mechanism below the inner pipe joint 12.

[0059] Then, adjust the relative position of the ball screw 15 and the second support column 102 through the forward and reverse rotation of the motor 32, and further adjust the axial position of the support plate 31 to lower the packing mechanism into the vertical section of the casing 13.

[0060] After that, by adjusting the lengths and directions of a plurality of adjusting jigs 14, the casing 13 is bent and deformed until a wellbore structure with a predetermined well inclination angle and azimuth angle is reached.

[0061] Preferably, in this way, small-range changes in the well inclination angle and azimuth angle can be achieved, so that the process of running in and setting the packer under different wellbore structures can be accurately simulated.

[0062] Afterwards, the relative position of the ball screw 15 and the second pillar 102 is continuously adjusted by the motor 32, thereby driving the movable plate 11 and the sealing mechanism to move downward synchronously until they move to a predetermined position in the casing 13. At this time, the casing 13 and the first closed end 121 will form a sealed connection, so that a closed chamber will be formed inside the casing 13.

[0063] Afterwards, high-temperature liquid is injected into the inner pipe joint 12 through the hydraulic pump 16. After the high-temperature liquid fills the sealing mechanism, it will form a pressure-holding pressure, which will flow through the through holes on the outer wall of the inner tube 21 to the annulus between the inner tube 21 and the casing 13, thereby pushing the slider 23 and the protective sleeve 22 downward together, and further pushing the second cava 26 and the sealing rubber cylinder downward, thereby prompting the first cava 25 to expand outward under the action of the first vertebra 251 to be embedded in the inner wall of the casing 13.

[0064] Afterwards, high-temperature liquid continues to be injected, the shear pins are cut off under the action of the extrusion force, the sealing rubber tube moves outward and radially abuts against the casing 13, and at the same time, the second slip 26 expands outward under the action of the second vertebral body 261 to embed on the inner wall of the casing 13 to complete the entire sealing work.

[0065] Finally, a load is applied to the inner tube 21 by driving the motor to observe the sealing effect of the sealing mechanism under a dynamic load environment.

[0066] Preferably, after the isolation mechanism is set, the driving motor can provide a dynamic load to the inner tube 21, so that it is easier to simulate the mechanical behavior of the isolation mechanism subjected to the dynamic load after setting, so as to further improve the accuracy and authenticity of the simulation data.

[0067] Compared with the prior art, the advantages of the present invention are:

[0068] First, the device can simulate the process of packer lowering and setting in wellbore structures with different well inclination angles and azimuth angles in a small range. In addition, the casing 13 in the device includes a vertical section and a curved section, so that the movement state of the packer during the lowering process can be more easily observed, so as to further meet the setting test of the packer in the vertical well section and the inclined well section.

[0069] Secondly, the device can provide dynamic load to the packing mechanism after setting, so as to facilitate the study of the mechanical behavior of the packing mechanism from lowering to setting and then to the whole process after setting. In this way, the accuracy and authenticity of the simulation data of the device can be improved, so as to provide real technical support for the mechanical analysis model hypothesis of the packer, and then accurately reflect the mechanical behavior of the packer to clarify its failure mechanism. In addition, the application has the characteristics of simple operation, easy implementation and multiple functions.

[0070] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or variations within the disclosure scope of the present invention, and such changes or variations should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An adjustable angle packer test device, comprising: A frame (10) on which a movable plate (11) is arranged, an inner pipe joint (12) provided on the movable plate (11), and a casing (13) arranged on the frame (10) and used to receive the sealing mechanism, Wherein, an adjusting fixture (14) for fixing the casing (13) is provided on the frame (10), and the adjusting fixture (14) can cause the casing (13) to bend and deform to simulate a wellbore structure.

2. The adjustable angle packer test device according to claim 1, characterized in that: A plurality of adjustment clamps (14) are arranged at intervals along the axial direction of the frame (10).

3. The adjustable angle packer test device according to claim 2, characterized in that: A first sealed end (121) is provided below the inner pipe joint (12) and is arranged outside the sealing mechanism and is sealedly connected to the sleeve (13).

4. The adjustable angle packer test device according to claim 3, characterized in that: A ball screw (15) is provided on the frame (10), and the adjustable angle packer test device also includes a driving member connected to the ball screw (15), and the driving member is configured to be able to adjust the axial position of the movable plate (11) to simulate the lowering process of the packer mechanism.

5. The adjustable angle packer testing device according to claim 4, characterized in that: The sealing mechanism comprises an inner tube (21), a protective sleeve (22) arranged below the inner tube (21), and a sliding block (23) sealingly sleeved outside the inner tube (21) and abutting against the protective sleeve (22).

6. The adjustable angle packer testing device according to claim 5, characterized in that: The adjustable angle packer test device also includes a hydraulic pump (16) connected to the side wall of the inner pipe joint (12) and used for injecting liquid. A through hole is provided on the outer wall of the inner pipe (21) to allow liquid to flow into the annulus between the inner pipe (21) and the casing (13).

7. The adjustable angle packer testing device according to claim 6, characterized in that: The sealing assembly comprises a sealing rubber tube, vertebrae arranged at both ends of the sealing rubber tube, and a first slip (25) and a second slip (26) respectively adapted to the two vertebrae, wherein the second slip (26) is fixedly connected to the vertebrae by shear nails in an initial state.

8. The adjustable angle packer testing device according to claim 7, characterized in that: The sealing mechanism further comprises a base (27) arranged below the first slip (25). The adjustable angle packer testing device further comprises a second closed end (122) arranged at the bottom of the casing (13) and connected to the base (27).

9. The adjustable angle packer testing device according to claim 8, characterized in that: A protective sleeve (28) is provided between the first slip (25) and the base (27).

10. A test method, using the adjustable angle packer test device according to any one of claims 1 to 9, comprising the following steps: S1, adjusting the clamp (14) to cause the casing (13) to bend and deform to simulate the wellbore structure; S2, adjusting the axial position of the movable plate (11) by means of a driving member to cause the isolation mechanism to be lowered into a predetermined position in the casing (13), until the casing (13) forms a sealed connection with the first sealed end (121); S3. Liquid is injected into the inner pipe joint (12) through a hydraulic pump (16). The liquid flows through the through hole to the annulus between the inner pipe (21) and the casing (13) under the pressure to push the slider (23) downward, thereby allowing the first slip (25), the sealing rubber cylinder and the second slip (26) to seal the casing (13) in sequence.

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