Novel packer slip anchoring performance evaluation device

Abstract

The invention relates to the technical field of oil production engineering, in particular to a novel packer slip anchoring performance evaluation device. The novel packer slip anchoring performance evaluation device comprises a center pipe, the bottom of the center pipe is provided with a slip bowl protruding in the annular direction, a slip is installed on the slip bowl, an upper sleeve is arranged outside the center pipe, a supporting piece is arranged below the upper sleeve, a lock body is arranged above the center pipe, a gland is arranged above the lock body, and the lock body and the gland are combined through a step structure. According to the novel packer slip anchoring performance evaluation device, the working environment of the slip is simulated through the center pipe and the upper sleeve, pressure is applied to the slip through cooperation of the gland and the lock body so that the slip can be anchored to the inner wall of the upper sleeve, the device structure and operation are simple, and the anchoring performance of the slip can be rapidly, safely and accurately measured.

Description

Technical Field

[0001] The invention relates to the technical field of oil production engineering, and in particular to a novel packer slip anchoring performance evaluation device. Background Art

[0002] High temperature and high pressure resistance 2 S and CO 2 The research on the integrated acid fracturing and completion process is an important part of the acid fracturing system and supporting acid fracturing and completion process in Sichuan and Chongqing. The development process of its core tool, the packer, needs to meet the requirements of acid fracturing and completion at the same time. The reliability and life of its key anchoring mechanism are high, and the design is difficult. It takes many experiments to verify the reliability of its anchoring mechanism. In the existing technology, the packer slip detection requires the overall anchoring detection of the slip device in the packer, and it needs to repeat the experiment many times to verify the reliability of its anchoring mechanism. The operation is complicated, the cost is high, and it takes a long time. Therefore, in view of the above shortcomings, a new packer slip anchoring performance evaluation device is proposed. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a novel packer slip anchoring performance evaluation device, which solves the problems of the existing packer slip detection device being complex to operate, high in cost and time-consuming.

[0004] (II) Technical solution In order to solve the above problems, the present invention provides a novel device for evaluating the anchoring performance of a packer slip, comprising: a center pipe, an upper casing, a slip, a pressure cover and a lock body; the center pipe is inserted into the upper casing, a slip seat with an annular protrusion is provided at the bottom of the center pipe, the slip is installed on the slip seat, and the bottom of the upper sleeve is level with the slip seat; a support is provided below the upper sleeve; the lock body is annularly sleeved on the top of the center pipe and can move freely on the center pipe; the lower end of the lock body is a downwardly contracted inclined surface, and the lock body presses the slip downward after being subjected to force; a pressure cover is provided above the lock body, and a pressure device is arranged above the pressure cover and transmits the pressure to the lock body.

[0005] Preferably, a lock ring is provided in the lock body, and the lock body is connected to the lock ring via threads.

[0006] Preferably, the inner surface of the locking ring and the outer surface of the central tube are respectively provided with one-way teeth that cooperate with each other, so that the locking ring can only move downward.

[0007] Preferably, the central tube comprises an upper central tube and a lower central tube, and the upper central tube is installed above the lower central tube.

[0008] Preferably, the upper central tube and the lower central tube are detachably connected.

[0009] Preferably, the support member is a lower casing or a sleeve.

[0010] Preferably, the top ends of the upper sleeve and the sleeve are respectively provided with step structures that cooperate with the bottom end of the upper sleeve.

[0011] (III) Beneficial effects The present invention provides a novel packer slip anchoring performance evaluation device, which simulates the working environment of the packer by installing the slip between the center pipe and the upper casing, and simulates the stress environment in the packer by using the pressure cover and the lock body. The device has a simple structure and can efficiently and quickly measure the pressure required for the slip to break and realize the anchoring performance detection of the packer slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a novel packer slip anchoring performance evaluation device of the present invention; Figure 2 It is a structural schematic diagram of the novel packer slip anchoring performance evaluation device of the present invention when testing the slip anchoring performance.

[0013] Among them, 1. pressure cover; 2. locking ring; 3. lock body; 4. upper center tube; 5. lower center tube; 6. upper casing; 7. lower casing; 8. slip; 9. sleeve. Implementation

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] like Figure 1 As shown, the present invention provides a novel packer slip anchoring performance evaluation device, which specifically comprises: a gland 1, a lock body 3, a slip 8, a central pipe and an upper casing 6; the central pipe is inserted into the casing, and the slip 8 is installed between the upper casing 6 and the central pipe to simulate the working environment of the slip 8 when the packer is working. A lock body 3 is mounted on the central pipe, and the lock body 3 moves freely up and down along the central pipe. The lower end of the lock body 3 is a downwardly contracted inclined surface. When the lock body 3 moves downward, the inclined surface at the lower end pushes the slip 8 to move toward the casing.

[0017] Among them, a locking ring 2 is provided on the inner side of the top of the lock body 3, and the locking ring 2 is mounted in the lock body 3 and threadedly connected to the lock body 3. When the lock body 3 is forced to move downward, the locking ring 2 will be driven to move downward together; a first one-way tooth is provided on the inner wall of the locking ring 2, and a second one-way tooth is provided on the outer side of the top of the center tube, and the first one-way tooth and the second one-way tooth cooperate with each other. During the experiment, the locking ring 2 moves downward along the center tube after the lock body 3 is forced. At this time, the locking ring 2 moves normally. After the pressure of the pressure source above is cancelled after the cava 8 is broken and anchored, the cava 8 will rebound upward due to its own nature, pushing the lock body 3 upward. At this time, under the action of the first one-way tooth and the second one-way tooth, the locking ring 2 cannot move upward. Since the locking ring 2 and the lock body 3 are threadedly connected, the positions of the locking ring 2 and the lock body 3 are fixed together at the position when anchored, preventing the rebound of the cava 8 from occurring, so that the anchoring state of the device does not change and is always the same as the state when anchoring occurs, thereby improving the stability and accuracy of the data. At the same time, the structure of the lock ring 2 provided in the lock body 3 is the same as the structure of the packer in actual application, so that the sealing and experimental environment of the slip 8 are closer to actual application, and the experimental data are closer to the data in actual application, and the experimental data measured by the device are practical.

[0018] It should be noted that a circumferentially protruding slip seat is provided at the bottom of the central pipe, and the slip 8 is installed on the slip seat. The shape of the slip seat is the same as the position where the slip 8 is installed on the packer in actual application. The actual rupture load of the slip 8 measured during the experiment is consistent with that during the downhole operation, which improves the accuracy of the device and ensures the authenticity and reliability of the experimental data.

[0019] A gland 1 is provided above the lock body 3. The top of the gland 1 is flat and used to install the pressure source and bear the downward pressure. The bottom end of the gland 1 is matched with the lock body 3 through a step structure to fix the position of the gland 1, prevent the gland 1 from slipping off during operation, and improve the safety of the device. At the same time, the installation method of the step structure is simple in processing and manufacturing and disassembly steps, which is convenient for the production, disassembly and installation of the device, improves the economy of the device, reduces the workload during the disassembly process of the device, and improves the practicality of the device. During the working process, the pressure source is installed, and the pressure source applies downward pressure to the gland 1. The pressure is transmitted to the lock body 3 through the step structure, thereby pushing the lock body 3 to move downward. The inclined surface at the lower end of the lock body 3 contacts the slip 8 and transmits the pressure to the slip 8, pushing the slip 8 to move toward the inner wall of the casing. When the downward pressure reaches the breaking load condition of the slip 8, the slip 8 breaks and fits the inner wall of the casing. At this time, the pressure load is continued to increase so that the slip 8 is anchored on the inner wall of the lower casing 7. At this time, the pressure required for the slip to break can be determined according to the output pressure of the pressure source.

[0020] like Figure 1As shown, the central tube includes an upper central tube 4 and a lower central tube 5, and the upper central tube 4 and the lower central tube 5 are detachably connected. In this embodiment, the upper central tube 4 and the lower central tube 5 are connected by threads, which ensures that the upper central tube 4 and the lower central tube 5 are connected without affecting the up and down movement of the lock body 3. After the experiment is over, the lower central tube 5 can be disassembled by rotating the lower central tube 5 to remove the lower central tube 5, and other components can be removed. There is no need to separate the slip 8 and the casing in the anchoring state, which reduces the workload when the device is disassembled and improves the work efficiency. At the same time, the slip 8 and the casing always remain in the anchoring state, which is convenient for observing the anchoring effect and anchoring state of the slip 8 after the test, and improves the accuracy of the detection result.

[0021] In the present invention, a support is placed under the upper casing 6, and the support includes a lower casing 7 and a sleeve 9. When the slip 8 is fracturing, the upper casing 6 is installed above the lower casing 7 and cooperated with the step structure. While fixing the position between the upper casing 6 and the lower casing 7, the installation method of the step structure is more convenient for disassembly. The bottom end of the upper casing 6 is at the same height as the slip seat. During the working process, the slip 8 is fracturing on the inner wall of the upper casing 6 after being stressed. The lower sleeve 7 plays a supporting role, lifting the upper sleeve 6 to the same height as the slip seat, ensuring that the slip 8 can be anchored at the specified position of the inner wall of the upper casing 6. At the same time, since the slip 8 needs to be anchored on the inner wall of the casing during the experiment, the casing needs to be replaced after multiple experiments. By dividing the casing into an upper casing 6 and a lower casing 7, when replacing the casing, only the upper sleeve anchored with the slip 8 needs to be replaced. After the test, only the upper sleeve 6 needs to be replaced, which reduces material loss, saves the use cost of the device, and improves the economy of the device. At the same time, after the experiment is finished, the bottom of the lower central tube 5 can be exposed by removing the lower sleeve 7, which is convenient for rotating the lower sleeve 7 for disassembly, thereby improving the working efficiency of the device.

[0022] like Figure 2 As shown, after the slip 8 is anchored on the inner wall of the upper casing 6, the bottom of the lower center pipe 5 needs to be lifted and suspended in the air to test the anchoring performance of the slip 8. At this time, the lower casing 7 needs to be replaced with a sleeve 9, the diameter of the sleeve 9 is the same as that of the lower casing 7, the bottom end of the sleeve 9 is horizontal, and the top end is provided with a step structure that is the same as the top end of the lower casing 7. When the sleeve 9 is installed below the upper casing 6, it can be tightly combined with the upper casing 6 and fix the position to prevent it from falling off. After the slip 8 is anchored on the inner wall of the upper center pipe 4, the lower casing 7 is removed and replaced with the sleeve 9. At this time, the bottom of the center pipe part of the device is suspended in the air, and the gravity of the device and the downward pressure received are completely borne by the anchored slip 8. At this time, the load is re-applied to the gland 1, and the load is increased according to the design requirements of the slip 8. In the process of applying the load, observe whether the slip 8 and the sleeve 9 move relative to each other to determine whether the slip 8 meets the anchoring performance.

[0023] Among them, since the surface of the sleeve 9 and the upper sleeve 6 is not transparent, it is impossible to visually observe the working state of the slip 8 during the experiment. Since the bottom end of the upper sleeve 6 is flush with the slip seat, the movement state of the slip 8 when the load is applied in the experiment can be judged by observing whether the slip 8 leaves scratches on the inner wall of the sleeve 9 after the work is completed, and then judge whether the slip 8 meets the anchoring performance.

[0024] The novel packer slip anchoring performance evaluation device provided by the present invention has a simple structure, convenient operation, and small experimental workload, and can efficiently and quickly realize the anchoring performance detection of the packer slip. The specific operation process of the device is as follows: Step 1: Assemble according to the device structure, connect the upper center tube and the lower center tube and place them on the workbench, install the slips on the slip seat at the bottom of the lower center tube, put the lower casing and upper casing on the outside of the center tube in turn, then connect the lock ring and the lock body and put them on the top of the upper center tube, and place the gland on the lock body. At this time, the lower casing will pad the upper casing to the same height as the slips.

[0025] Step 2: Apply downward pressure to the top of the gland through the pressure source, and gradually increase the pressure to the breaking load of the slip. At this time, the gland transfers the pressure downward to the lock body, and the lock body moves downward to transfer the pressure to the slip through the inclined surface below the lock body and pushes the slip toward the inner wall of the upper casing. When the force on the slip reaches its breaking load, the slip breaks and sticks to the inner wall of the lower casing. The output pressure of the pressure source read at this time is the pressure value required for the slip to break.

[0026] Step 3: Continue to increase the pressure load to anchor the slips on the inner wall of the upper casing. At this time, the conical structure on the surface of the slips forms a larger load, and the slips drill into the inner wall of the upper casing to fix the device and form an anchor.

[0027] Step 4: Turn off the pressure source and replace the lower casing in the device with a sleeve. At this time, the entire device is lifted by the sleeve, the lower center pipe is suspended in the air, and the gravity of the center pipe is completely borne by the anchored slips.

[0028] Among them, during the pressurization process of steps two and three, the lock body is forced to move downward while driving the lock ring downward together. When the pressure source is closed and the lower casing is replaced with a sleeve, the cava will rebound and push the lock body upward due to its own properties. At this time, the lock body is connected to the lock ring, and the first one-way tooth inside the lock ring and the second one-way tooth outside the upper center tube cooperate to prevent the lock ring from moving upward with the lock body, thereby fixing the position of the lock body and preventing the cava from rebounding.

[0029] Step 5. Continue to apply load to the upper cover according to the design requirements of the slips, and observe the relative movement between the slips and the sleeve to determine the anchoring performance of the slips. In this process, all the loads on the gland are transferred downward and borne by the slips. When the load size is the designed anchoring load of the slips, observe whether there is relative movement between the slips and the sleeve. If there is relative movement, it means that the slips do not meet the anchoring performance. On the contrary, if there is no relative movement, the slips meet the anchoring performance.

[0030] Among them, during the experiment, since the upper casing and the sleeve are both opaque, it is not possible to visually observe whether the cava and the sleeve have relative movement during the experiment. After the experiment, the device can be disassembled to observe the upper casing and the inner wall of the sleeve. Since the bottom end of the upper casing is flush with the cava seat, if there are scratches left by the cava on the side wall of the sleeve, it means that there is relative movement and the cava does not meet the anchoring performance. Conversely, if there are no scratches on the side wall of the sleeve, it means that the cava meets the anchoring performance.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel packer slip anchoring performance evaluation device, characterized in that: include: A center tube, an upper sleeve (6), a slip (8), a pressure cover (1) and a lock body (3); the center tube is inserted into the upper sleeve (6); a slip seat with an annular protrusion is provided at the bottom of the center tube; the slip (8) is installed on the slip seat; the bottom of the upper sleeve (6) is level with the slip seat; a support is provided below the upper sleeve (6); the lock body (3) is annularly sleeved above the center tube and can move freely on the center tube; the lower end of the lock body (3) is a downwardly contracted inclined surface; the lock body (3) presses the slip (8) downward after being subjected to force; a pressure cover (1) is provided above the lock body (3); a pressure device is arranged above the pressure cover (1) and transmits pressure to the lock body (3).

2. The novel packer slip anchoring performance evaluation device according to claim 1 is characterized in that: A lock ring (2) is provided inside the lock body (3), and the lock body (3) is connected to the lock ring via threads.

3. The novel packer slip anchoring performance evaluation device according to claim 2 is characterized in that: The inner surface of the lock ring (2) and the outer surface of the central tube are respectively provided with one-way teeth that cooperate with each other, so that the lock ring (2) can only move downwards.

4. The novel packer slip anchoring performance evaluation device according to claim 1 is characterized in that: The central tube comprises an upper central tube (4) and a lower central tube (5), and the upper central tube (4) is installed above the lower central tube (5).

5. The novel packer slip anchoring performance evaluation device according to claim 4 is characterized in that: The upper central tube (4) and the lower central tube (5) are detachably connected.

6. The novel packer slip anchoring performance evaluation device according to claim 1 is characterized in that: The support member is a lower casing (7) or a sleeve (9).

7. The novel packer slip anchoring performance evaluation device according to claim 6 is characterized in that: The top ends of the upper sleeve (6) and the sleeve (9) are respectively provided with step structures that match the bottom end of the upper sleeve (6).

Images