Induction type graded well cementation tool, graded well cementation equipment and graded well cementation method

Abstract

The invention relates to the field of well cementation, and provides an induction type grading well cementation tool, grading well cementation equipment and a grading well cementation method.The induction type grading well cementation tool comprises a main shell, an induction type grading well cementation device and a grading well cementation method.The main shell is provided with a circulating hole penetrating in the radial direction; the inner sliding sleeve is arranged in the main shell, a first hydraulic cavity and a second hydraulic cavity are defined by the inner sliding sleeve and the main shell, and the inner sliding sleeve is provided with a radial through circulation opening; and the oil pump is communicated with the first hydraulic cavity and the second hydraulic cavity. According to the technical scheme, a shear pin is not needed, the problem that the pressure of the shear pin of a traditional grading well cementation tool is not accurate can be effectively solved, and well cementation accidents are avoided.

Description

Technical Field

[0001] This disclosure relates to the field of cementing technology, and in particular to an induction-type staged cementing tool, a staged cementing device, and a staged cementing method. Background Technology

[0002] Oil and gas exploration and development are gradually moving towards "deep, low-pressure, offshore, and non-destructive" areas. The proportion of low-pressure, easily leaking wells and deep wells with long cemented sections is increasing. To reduce construction risks and ensure cementing quality, the number of staged cementing operations is growing. Staged cementing typically uses mechanical stage clamps or mechanical-hydraulic dual-acting stage clamps. Opening the circulation hole is achieved by deploying an opening spring / pressure-retaining shear pin, which pushes the opening sleeve to open the circulation hole. Closing the circulation hole is achieved by using a closing plug and pressure-retaining shear pin, which pushes the closing sleeve to close the circulation hole. Furthermore, staged cementing tools are precision oil tools, requiring strict material selection and high machining accuracy, and are greatly affected by the processing technology. CN207538817U and CN221119905U disclose staged cementing devices, both of which utilize shear pins. However, the shearing pressure of pins processed in different batches is different. At the same time, the performance of the tools is greatly affected by the temperature and pressure inside the well. This leads to frequent occurrences of problems such as the inability of the staged cementing tool to open or close the hole, incomplete hole closing, and inaccurate shearing pin pressure during cementing operations. These accidents are frequent and seriously affect the production efficiency and quality of oil and gas fields. Summary of the Invention

[0003] One of the technical problems this disclosure aims to solve is that shear pins affect the normal use of staged cementing tools.

[0004] To address the aforementioned technical problems, embodiments of this disclosure provide an induction-type staged cementing tool, comprising:

[0005] The main housing is provided with a radially penetrating circulation hole;

[0006] An inner sliding sleeve is disposed in the main housing and forms a first hydraulic chamber and a second hydraulic chamber with the main housing. The inner sliding sleeve is provided with a radially penetrating circulation port.

[0007] An oil pump, wherein the oil pump is connected to the first hydraulic chamber and the second hydraulic chamber;

[0008] The oil pump is capable of transferring hydraulic oil between the first hydraulic chamber and the second hydraulic chamber to change the volume of the first hydraulic chamber and the second hydraulic chamber through the hydraulic oil, and to make the inner sleeve move axially relative to the main housing between an open position and a closed position. In the open position, the circulation hole is aligned with the circulation port, and in the closed position, the circulation hole and the circulation port are misaligned.

[0009] In some embodiments, the main housing is provided with a positioning sleeve located on the upper side of the inner sliding sleeve and a lower connector located on the lower side of the inner sliding sleeve. The inner sliding sleeve includes an upper part inserted into the positioning sleeve, a middle part that is sealed and engaged with the inner circumferential surface of the main housing, and a lower part inserted into the lower connector. The outer diameter of the middle part is larger than the outer diameters of the upper part and the lower part. A first hydraulic cavity is formed between the middle part and the positioning sleeve, and a second hydraulic cavity is formed between the middle part and the lower connector.

[0010] In some embodiments, a first sealing ring is provided between the middle portion and the main housing.

[0011] In some embodiments, a first elastic element is provided between the upper part and the positioning sleeve, and a second elastic element is provided between the upper part and the lower connector.

[0012] In some embodiments, the upper end face is provided with a first recess to accommodate the first elastic member, and the lower end face is provided with a second recess to accommodate the second elastic member.

[0013] In some embodiments, the positioning sleeve and the main housing are provided with a first hydraulic channel connecting the oil pump and the first hydraulic chamber, and a second hydraulic channel connecting the oil pump and the second hydraulic chamber.

[0014] In some embodiments, a sensing element communicatively connected to the oil pump is also included, the sensing element being capable of sensing signals to control the operation of the oil pump.

[0015] In some embodiments, the sensing element includes a pressure sensing unit that is communicatively connected to the oil pump.

[0016] In some embodiments, the sensing element includes a magnetic induction unit communicatively connected to the oil pump, and the inductive staged cementing tool includes a shut-in plug with a magnetic element at its lower end. The shut-in plug is insertable into the main housing to couple the magnetic element to the magnetic induction unit.

[0017] In some embodiments, the sensing element is connected to the oil pump via a wire.

[0018] In some embodiments, a mounting sleeve is included, in which the oil pump and the sensing element are disposed.

[0019] In some embodiments, the mounting sleeve is disposed on the upper side of the inner sliding sleeve.

[0020] In some embodiments, a battery electrically connected to the oil pump is also included.

[0021] In addition, this disclosure provides a staged cementing device, which includes a casing and the induction staged cementing tool described in the above embodiments.

[0022] In some embodiments, the casing includes a first casing portion and a second casing portion. A float shoe is provided at the lower end of the first casing portion, and a float collar is provided at the upper end of the first casing portion. A pressure seat is provided on the float collar, and the second casing portion is connected to the pressure seat. The inductive staged cementing tool is provided on the second casing portion.

[0023] In addition, this disclosure also provides a staged cementing method, characterized in that the staged cementing method adopts the staged cementing equipment described in the above scheme.

[0024] In some implementations, the following are included:

[0025] The staged cementing equipment is lowered in;

[0026] The first-stage cementing operation involves injecting pre-filled fluid and cement slurry through the cement head, followed by injection of replacement fluid.

[0027] The flexible plug is inserted to press and open the induction-type staged cementing tool;

[0028] Inject drilling fluid to wash out excess cement slurry;

[0029] Perform a two-stage cementing operation, injecting pre-filled fluid and cement slurry, then injecting replacement fluid, and then shutting off the induction-type staged cementing tool.

[0030] The above technical solution eliminates the need for shear pins, effectively preventing problems such as inaccurate shear pin pressure in traditional staged cementing tools and avoiding cementing accidents. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the induction-type staged cementing tool according to the present disclosure;

[0033] Figure 2 This is a partial structural schematic diagram of the induction-type staged cementing tool according to an embodiment of the present disclosure;

[0034] Figure 3 This is a partial structural schematic diagram of the induction-type staged cementing tool according to an embodiment of the present disclosure;

[0035] Figure 4 This is a schematic diagram of the flexible plug and the pressing seat according to an embodiment of the present disclosure.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Closed-hole plug, 2-Main housing, 3-Pressure sensing unit, 4-Wire, 5-Oil pump, 6-First hydraulic channel, 7-First hydraulic chamber, 8-Second hydraulic channel, 9-First sealing ring, 10-Second hydraulic chamber, 11-Inner sliding sleeve, 12-Second sealing ring, 13-Lower connector, 14-First elastic element, 15-Circulation hole, 16-Circulation port, 17-Second elastic element, 18-Positioning sleeve, 19-Mounting sleeve, 20-Battery, 21-Magnetic induction unit, 22-Magnetic element, 23-Flexible plug, 24-Push-down seat. Detailed Implementation

[0038] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0039] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0040] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0042] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0043] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0044] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0045] refer to Figures 1-3 As shown, this solution provides an induction-type staged cementing tool, which includes:

[0046] The main housing 2 is provided with a radially penetrating circulation hole 15;

[0047] Inner sliding sleeve 11, the inner sliding sleeve 11 is disposed in the main housing 2 and forms a first hydraulic cavity 7 and a second hydraulic cavity 10 with the main housing 2, and the inner sliding sleeve 11 is provided with a radially penetrating circulation port 16;

[0048] Oil pump 5, which is connected to the first hydraulic chamber 7 and the second hydraulic chamber 10;

[0049] The oil pump 5 is capable of transferring hydraulic oil between the first hydraulic chamber 7 and the second hydraulic chamber 10 to change the volume of the first hydraulic chamber 7 and the second hydraulic chamber 10 through the hydraulic oil, and to make the inner sleeve 11 move axially relative to the main housing 2 between an open position and a closed position. In the open position, the circulation hole 15 is aligned with the circulation port 16, and in the closed position, the circulation hole 15 and the circulation port 16 are misaligned.

[0050] Induction-type staged cementing tools can be installed on the casing and can be opened and closed to connect or disconnect the casing from the annulus. Fluids such as pre-filled fluid, displacement fluid, and cement slurry can be selectively injected into the annulus.

[0051] The main structure of the main housing 2 is generally tubular and has a circulation hole 15 that penetrates the pipe wall, allowing the main housing 2 to connect the interior and exterior. Other structures are directly or indirectly provided on the main housing 2.

[0052] The inner sliding sleeve 11 is roughly a tubular structure with a circulation port 16 that penetrates the tube wall. The circulation port 16 can connect the inside and outside of the inner sliding sleeve 11.

[0053] Two hydraulic chambers, namely a first hydraulic chamber 7 and a second hydraulic chamber 10, are formed between the inner sliding sleeve 11 and the main housing 2. When assembling an induction-type staged cementing tool, both hydraulic chambers can be filled with hydraulic oil. The inner sliding sleeve 11 can move axially relative to the main housing 2. This movement allows changes in the volume of the first hydraulic chamber 7 and the second hydraulic chamber 10. For example, referring to… Figure 2 and Figure 3 As shown, when the inner sliding sleeve 11 moves to the right, the volume of the first hydraulic chamber 7 increases while the volume of the second hydraulic chamber 10 decreases. Conversely, when the inner sliding sleeve 11 moves to the left, the volume of the first hydraulic chamber 7 decreases while the volume of the second hydraulic chamber 10 increases. In other words, when the inner sliding sleeve 11 moves relative to the main housing 2 along opposite axial directions, the volume changes of the first hydraulic chamber 7 and the second hydraulic chamber 10 exhibit opposite trends. Furthermore, when the inner sliding sleeve 11 moves axially relative to the main housing 2, the volume changes of the first hydraulic chamber 7 and the second hydraulic chamber 10 also exhibit opposite trends.

[0054] Based on the relationship between the axial movement of the inner sleeve 11 and the volume changes of the first hydraulic chamber 7 and the second hydraulic chamber 10, the volume changes of the first hydraulic chamber 7 and the second hydraulic chamber 10 can, in turn, drive the axial movement of the inner sleeve 11. For example, refer to... Figure 2 and Figure 3 As shown, when the volume of the first hydraulic chamber 7 increases and the volume of the second hydraulic chamber 10 decreases, the inner sliding sleeve 11 can move to the right. Conversely, when the volume of the first hydraulic chamber 7 decreases and the volume of the second hydraulic chamber 10 increases, the inner sliding sleeve 11 can move to the left.

[0055] The oil pump 5 is connected to the first hydraulic chamber 7 and the second hydraulic chamber 10 respectively, that is, its two ports are connected to the first hydraulic chamber 7 and the second hydraulic chamber 10 respectively. The oil pump 5 can drive fluid, such as hydraulic oil, to flow bidirectionally. For example, it can drive hydraulic oil to flow from the first hydraulic chamber 7 to the second hydraulic chamber 10, and it can also drive hydraulic oil to flow from the second hydraulic chamber 10 to the first hydraulic chamber 7. Furthermore, as the hydraulic oil transfers between the two hydraulic chambers, the volume of the two hydraulic chambers also changes accordingly under the pressure of the hydraulic oil. That is, when the hydraulic oil is transferred to the second hydraulic chamber 10, the volume of the second hydraulic chamber 10 increases and the volume of the first hydraulic chamber 7 decreases, and when the hydraulic oil is transferred to the first hydraulic chamber 7, the volume of the first hydraulic chamber 7 increases and the volume of the second hydraulic chamber 10 decreases. Correspondingly, as the volume of the hydraulic chamber changes, the inner sliding sleeve 11 also moves axially relative to the main housing 2.

[0056] It can be seen that by driving hydraulic oil to transfer between the two hydraulic chambers through the oil pump 5, the inner sleeve 11 can be driven to move axially relative to the main housing 2, thereby causing the circulation port 16 on the inner sleeve 11 to move axially relative to the main housing 2, so that the circulation port 16 is aligned or offset from the circulation hole 15 on the main housing 2. When the circulation port 16 is aligned with the circulation hole 15, the inside (i.e., the inside of the inner sleeve 11) and the outside (i.e., the outside of the main housing 2) of the induction stage cementing tool are connected, allowing the internal fluid to flow outward through the circulation port 16 and the circulation hole 15. When the circulation port 16 is offset from the circulation hole 15, the inside and outside of the induction stage cementing tool are disconnected from each other, which can prevent the internal fluid from flowing to the outside.

[0057] Of course, it should be noted that, in the parts other than the circulation port 16 and the circulation hole 15, the outer peripheral surface of the inner sleeve 11 and the inner peripheral surface of the main housing 2 are sealed together to avoid fluid leakage.

[0058] Furthermore, when the oil pump 5 stops working, its internal flow path can be disconnected, acting as a valve that can be disconnected. This disconnects the first hydraulic chamber 7 and the second hydraulic chamber 10 from each other. Under this condition, the pressure of the hydraulic oil in the first hydraulic chamber 7 and the second hydraulic chamber 10 keeps their volumes constant, essentially neither increasing nor decreasing. This prevents the inner sleeve 11 from moving axially relative to the main housing 2. In other words, the oil pump 5 can act as a locking element, locking the transfer of hydraulic oil to lock the inner sleeve 11 relative to the main housing 2. For example, it can be locked at a position where the circulation port 16 and the circulation hole 15 are aligned to allow fluid to pass through, or it can be locked at a position where the circulation port 16 and the circulation hole 15 are offset to prevent fluid from passing through, thereby enabling the opening and closing of the induction-type staged cementing tool. Therefore, it can be seen that this solution achieves the opening and closing of the induction-type staged cementing tool through the cooperation of oil pump 5 and two hydraulic chambers, without the need to set pins and cut them off during use. Furthermore, the induction-type staged cementing tool can be closed again after being opened, without being restricted by the cut pins.

[0059] This solution eliminates the need for shear pins, effectively preventing issues such as inaccurate shear pin pressure in traditional staged cementing tools and avoiding cementing accidents.

[0060] In some embodiments, the main housing 2 is provided with a positioning sleeve 18 located above the inner sliding sleeve 11 and a lower connector 13 located below the inner sliding sleeve 11. The inner sliding sleeve 11 includes an upper part inserted into the positioning sleeve 18, a middle part that seals against the inner circumferential surface of the main housing 2, and a lower part inserted into the lower connector 13. The outer diameter of the middle part is larger than the outer diameters of the upper and lower parts. A first hydraulic cavity 7 is formed between the middle part and the positioning sleeve 18, and a second hydraulic cavity 10 is formed between the middle part and the lower connector 13. (Reference) Figures 1-3As shown, the outer diameter of the middle part of the inner sliding sleeve 11 is relatively large, while the outer diameters of its upper and lower parts are smaller, with the middle part protruding relative to the lower and upper parts. The main housing 2 has a positioning sleeve 18 located above the inner sliding sleeve 11, which is generally tubular to allow internal fluid to pass through. The main housing 2 has a lower connector 13 located below the inner sliding sleeve 11, which is also generally tubular to allow internal fluid to pass through. A second sealing ring 12 is provided between the lower connector 13 and the main housing 2. For example, an annular groove is provided on the outer circumferential surface of the portion of the lower connector 13 that inserts into the main housing 2, and the second sealing ring 12 is accommodated in this annular groove to improve the sealing effect. The upper part of the inner sliding sleeve 11 is inserted into the lower end of the positioning sleeve 18, and a seal is formed between the outer peripheral surface of the upper part and the inner peripheral surface of the positioning sleeve 18, thereby forming a first hydraulic cavity 7 between the middle part and the positioning sleeve 18. That is, the first hydraulic cavity 7 is surrounded by the main housing 2, the positioning sleeve 18 and the inner sliding sleeve 11. When the inner sliding sleeve 11 moves away from the positioning sleeve 18 axially relative to the main housing 2, the volume of the first hydraulic cavity 7 increases. When the inner sliding sleeve 11 moves towards the positioning sleeve 18 axially relative to the main housing 2, the volume of the first hydraulic cavity 7 decreases. Similarly, the lower part of the inner sleeve 11 is partially inserted into the lower connector 13, and a seal is formed between the outer peripheral surface of the lower part and the inner peripheral surface of the lower connector 13, thereby forming a second hydraulic cavity 10 between the middle part and the lower connector 13. That is, the second hydraulic cavity 10 is surrounded by the main housing 2, the lower connector 13 and the inner sleeve 11. When the inner sleeve 11 moves axially away from the lower connector 13 relative to the main housing 2, the volume of the second hydraulic cavity 10 increases; when the inner sleeve 11 moves axially toward the lower connector 13 relative to the main housing 2, the volume of the second hydraulic cavity 10 decreases. Among them, the outer peripheral surface of the middle part and the inner peripheral surface of the main housing 2 are sealed together so that the first hydraulic cavity 7 and the second hydraulic cavity 10 are isolated from each other and cannot be directly connected. In general, when the inner sliding sleeve 11 moves axially relative to the main housing 2 toward the positioning sleeve 18 and away from the lower connector 13, the volume of the first hydraulic chamber 7 increases and the volume of the second hydraulic chamber 10 decreases. When the inner sliding sleeve 11 moves axially relative to the main housing 2 away from the positioning sleeve 18 and toward the lower connector 13, the volume of the first hydraulic chamber 7 decreases and the volume of the second hydraulic chamber 10 increases.

[0061] Of course, in other embodiments, the first hydraulic chamber 7 and the second hydraulic chamber 10 can be formed in other ways. For example, the inner circumferential surface of the main housing 2 is provided with a first flange located on the upper side of the inner sliding sleeve 11 and a second flange located on the lower side of the inner sliding sleeve 11. The upper part of the inner sliding sleeve 11 is inserted into the first flange, and the lower part is inserted into the second flange. This can also form two hydraulic chambers. The first flange and the second flange are equivalent to the positioning sleeve 18 and the lower connector 13, respectively. The two flanges are integrally connected to the main housing 2 as part of the main housing 2.

[0062] In some embodiments, a first sealing ring 9 is provided between the middle portion and the main housing 2. The first sealing ring 9 further provides a seal between the middle portion of the inner sleeve 11 and the main housing 2, preventing leakage of the first hydraulic chamber 7 and the second hydraulic chamber 10 through the gap between the main housing 2 and the middle portion. Such leakage would allow hydraulic oil to transfer more easily between the first hydraulic chamber 7 and the second hydraulic chamber 10, making the oil pump 5 unable to restrict the transfer of hydraulic oil between the first hydraulic chamber 7 and the second hydraulic chamber 10. Under external force, the inner sleeve 11 will move uncontrollably axially relative to the main housing 2. Multiple first sealing rings 9 can be provided between the middle portion and the main housing 2, spaced apart axially to ensure a sealing effect. An annular groove for accommodating the first sealing rings 9 can be provided on the outer circumferential surface of the middle portion. When the inner sleeve 11 moves axially relative to the main housing 2, the first sealing rings 9 also move axially with the inner sleeve 11.

[0063] In some embodiments, a first elastic element 14 is provided between the upper part and the positioning sleeve 18, and a second elastic element 17 is provided between the upper part and the lower connector 13. (See reference) Figure 1 As shown, the inner sleeve 11 is in its uppermost limit position relative to the main housing 2. At this time, the circulation port 16 and the circulation hole 15 are misaligned, the first hydraulic chamber 7 has its smallest volume and the second hydraulic chamber 10 has its largest volume. The first elastic element 14 can be in a compressed state, and the second elastic element 17 is in a stretched state. The oil pump 5 is started to transfer the hydraulic oil in the second hydraulic chamber 10 to the first hydraulic chamber 7. Both the first elastic element 14 and the second elastic element 17 can provide assistance for the axial movement of the inner sleeve 11. It can be seen that when the inner sleeve 11 is in its lowermost limit position, the circulation port 16 and the circulation hole 15 are aligned, the first hydraulic chamber 7 has its largest volume and the second hydraulic chamber 10 has its smallest volume, the first elastic element 14 is in a stretched state, and the second elastic element 17 is in a compressed state. The oil pump 5 is started to transfer the hydraulic oil in the first hydraulic chamber 7 to the second hydraulic chamber 10. The first elastic element 14 and the second elastic element 17 can also provide assistance for the axial movement of the inner sleeve 11. The first elastic element 14 and the second elastic element 17 can be springs or elastic rubber, etc. Of course, in other embodiments, the first elastic element 14 and / or the second elastic element 17 provide assistance only when the inner sleeve 11 moves toward the lower connector 13, or only when it moves toward the positioning sleeve 18.

[0064] In some embodiments, the upper end face is provided with a first recess to accommodate the first elastic member 14, and the lower end face is provided with a second recess to accommodate the second elastic member 17. The two ends of the first elastic member 14 are respectively connected to the upper part and the positioning sleeve 18, and can be accommodated in the first recess; the two ends of the second elastic member 17 are respectively connected to the lower part and the lower connector 13, and can be accommodated in the second recess. (Reference) Figures 1-3 As shown, the inner circumference of the positioning sleeve 18 can form a flange that can engage with the upper end face of the inner sliding sleeve 11 to stop further movement of the inner sliding sleeve 11; similarly, the inner circumference of the lower connector 13 also forms a flange that can engage with the lower end face of the inner sliding sleeve 11 to stop further movement of the inner sliding sleeve 11.

[0065] In some embodiments, the positioning sleeve 18 and the main housing 2 are provided with a first hydraulic channel 6 connecting the oil pump 5 and the first hydraulic chamber 7, and a second hydraulic channel 8 connecting the oil pump 5 and the second hydraulic chamber 10. (Reference) Figure 1 and Figure 2 As shown, the oil pump 5 can be disposed on the upper side of the positioning sleeve 18. The positioning sleeve 18 can have a portion of the first hydraulic channel 6 and the second hydraulic channel 8. The main housing 2 has the other portion of the first hydraulic channel 6 and the second hydraulic channel 8. The first hydraulic channel 6 and the second hydraulic channel 8 in the positioning sleeve 18 and the first hydraulic channel 6 and the second hydraulic channel 8 in the main housing 2 are respectively connected to each other, so as to connect the oil pump 5 to the first hydraulic chamber 7 and the second hydraulic chamber 10 respectively. Of course, in other embodiments, the first hydraulic channel 6 and the second hydraulic channel 8 can be disposed only in the main housing 2. The placement of the first hydraulic channel 6 and the second hydraulic channel 8 can also be adjusted as needed, as long as the oil pump 5 can be connected to the first hydraulic chamber 7 and the second hydraulic chamber 10.

[0066] In some embodiments, the induction staged cementing tool further includes a sensing element communicatively connected to the oil pump 5. This sensing element can sense signals to control the operation of the oil pump 5. After the induction staged cementing tool is lowered into the well, a corresponding signal can be sent to it. The sensing element can receive the signal and control the start and stop of the oil pump 5. For example, the oil pump 5 is controlled to start, transferring a predetermined volume of hydraulic oil from the second hydraulic chamber 10 to the first hydraulic chamber 7, causing the inner sliding sleeve 11 to move to a position where the circulation port 16 is aligned with the circulation hole 15. Then, the oil pump 5 is controlled to stop, holding the inner sliding sleeve 11 in that position. After the relevant operation is completed, a signal is sent to the sensing element again. The sensing element receives the signal and controls the oil pump 5 to start, transferring a predetermined volume of hydraulic oil from the first hydraulic chamber 7 to the second hydraulic chamber 10, causing the inner sliding sleeve 11 to move to a position where the circulation port 16 is misaligned with the circulation hole 15 (e.g., ...). Figure 1 As shown, the inner sleeve 11 is in its uppermost limit position. Then, control the oil pump 5 to shut down to keep the inner sleeve 11 in that position.

[0067] The sensing element can be a pressure sensing element, a magnetic sensing element, etc.

[0068] In some embodiments, the sensing element includes a pressure sensing unit 3 communicatively connected to the oil pump 5. The pressure sensing unit 3 can sense pressure signals to control the opening and closing of the oil pump 5. For example, after the induction-type cementing tool is lowered into the well, a flexible plug 23 is lowered in. The flexible plug 23 is displaced by the slurry and reaches the pressure seat 24 for pressure application. The pressure is increased to 10 MPa, then depressurized by 5 MPa, and then increased again to 15 MPa. When the pressure reaches the pressure encoding range set by the pressure sensing unit 3 (of course, the pressure encoding can also be other values, not limited to this), it sends a signal to the oil pump 5 to control the opening and closing of the oil pump 5, so that the inner sliding sleeve 11 moves to the position where the circulation port 16 and the circulation hole 15 are aligned, realizing the opening operation.

[0069] In some embodiments, the sensing element includes a magnetic induction unit 21 communicatively connected to the oil pump 5. The inductive staged cementing tool includes a shut-in plug 1, with a magnetic element 22 at its lower end. The shut-in plug 1 can be inserted into the main housing 2 to couple the magnetic element 22 to the magnetic induction unit 21. The magnetic element 22 can be made of a permanent magnet, such as a magnetic plate. When the shut-in plug 1 reaches the main housing 2, the magnetic element 22 couples with the magnetic induction unit 21 to send a magnetic signal to the magnetic induction unit 21. After receiving the magnetic signal, the magnetic induction unit 21 sends a signal to the oil pump 5. For example, during secondary cementing, after injecting displacement fluid and lowering the shut-in plug 1, when the shut-in plug 1 reaches a predetermined position in the main housing 2, the magnetic element 22 contacts the magnetic induction unit 21. After receiving the magnetic signal, the magnetic induction unit 21 sends a signal to the oil pump 5 to control the oil pump 5 to open and close, so that the inner sliding sleeve 11 moves to a position where the circulation port 16 and the circulation hole 15 are misaligned, thus realizing the shut-in operation.

[0070] In some embodiments, the sensing element is connected to the oil pump 5 via a wire 4. The pressure sensing unit 3 and the magnetic sensing unit 21 are respectively connected to the oil pump 5 via wires 4 to send electrical signals to the oil pump 5.

[0071] In some embodiments, the inductive staged cementing tool includes a mounting casing 19, in which the oil pump 5 and the sensing element are disposed. The mounting casing 19 is generally tubular and has a mounting cavity for mounting the oil pump 5, the sensing element, and the battery 20 described below. The pressure sensing unit 3 and the magnetic sensing unit 21 may be disposed at the upper end of the mounting casing 19.

[0072] In some embodiments, the mounting sleeve 19 is disposed on the upper side of the inner sliding sleeve 11. The positioning sleeve 18 may be located on the upper side of the inner sliding sleeve 11 and on the lower side of the mounting sleeve 19. The mounting sleeve 19 is disposed on the upper part of the main housing 2 and can stop on the inner flange of the main housing 2. The positioning sleeve 18 is partially inserted into the mounting sleeve 19 to achieve relative fixation between the two.

[0073] Additionally, in some embodiments, the induction-type staged cementing tool also includes a battery 20 electrically connected to the oil pump 5. The battery 20 provides power to the oil pump 5 and is disposed in the mounting casing 19.

[0074] In addition, this solution also provides a staged cementing device, which includes casing and the induction-type staged cementing tool described in the above solution. The induction-type staged cementing tool is disposed between two of the casing and can be used to connect the inside and outside of the casing to inject fluid into the annulus outside the casing.

[0075] In some embodiments, the casing includes a first casing portion and a second casing portion. A float shoe is provided at the lower end of the first casing portion, and a float collar is provided at the upper end of the first casing portion. A pressure seat 24 is provided on the float collar. The second casing portion is connected to the pressure seat 24, and the inductive staged cementing tool is disposed on the second casing portion. Figure 4 As shown, the flexible plug 23 can press against the pressure seat 24 to send a pressure signal to the pressure sensing unit 3, thereby controlling the operation of the oil pump 5 and causing the inner sliding sleeve 11 to move relative to the main housing 2.

[0076] In addition, this solution also provides a staged cementing method, wherein the staged cementing method uses the staged cementing equipment described in the above solution.

[0077] In some implementation methods, the staged cementing method includes:

[0078] The staged cementing equipment is lowered in;

[0079] The first-stage cementing operation involves injecting pre-filled fluid and cement slurry through the cement head, followed by injection of replacement fluid.

[0080] The flexible plug is inserted to press and open the induction-type staged cementing tool;

[0081] Inject drilling fluid to wash out excess cement slurry;

[0082] Perform a two-stage cementing operation, injecting pre-filled fluid and cement slurry, then injecting replacement fluid, and then shutting off the induction-type staged cementing tool.

[0083] In some implementations, the staged cementing method specifically includes the following steps.

[0084] During tool assembly, the first hydraulic chamber 7 and the second hydraulic chamber 10 are filled with hydraulic oil.

[0085] Before cementing operations, based on the actual conditions of the well, set the opening pressure code for pressure sensing unit 3, such as pressure changes of +10MPa, -5MPa, or +15MPa; of course, other pressure values ​​are also possible.

[0086] During casing installation, float shoes, casing, and float collars are installed separately. The pressure seat 24 is installed on the upper end of the float collar. The casing string is then installed, and the induction-type staged cementing tool is installed at the cementing design position. The casing string is then installed again until the predetermined well section is reached. The wellhead casing is connected to the cement head, and the flexible plug 23 is placed inside the cement head to prepare for the first stage cementing operation.

[0087] During the first-stage cementing operation, pre-filled fluid and cement slurry are injected from the cement head. After the cement slurry is injected, the cement head stop pin is opened, and replacement fluid is injected. The flexible plug 23 is then lowered and pushed until it reaches the pressure seat 24 for pressure application. The pressure is increased to 10 MPa, then depressurized by 5 MPa, and then increased by 15 MPa. When the pressure reaches the pressure coding range set by the pressure sensing unit 3, an opening signal is sent to the oil pump 5 through the wire 4. The oil pump 5 starts working and injects hydraulic oil from the first hydraulic chamber 7 into the second hydraulic chamber 10. The inner sliding sleeve 11 moves downward under the hydraulic pressure and stops when it reaches the upper end of the lower connector 13. At the same time, the first elastic element 14 and the second elastic element 17 are stretched and compressed respectively. At this time, the circulation port 16 communicates with the circulation hole 15, forming a circulation channel between the inside and outside of the pipe, thus completing the opening operation.

[0088] The well is circulated and flushed. The drilling fluid flows out from the circulation channel to wash away the excess cement slurry in the upper part. After the well is flushed, the gate plug 1 is placed into the cement head to prepare for the secondary cementing operation.

[0089] During the secondary cementing operation, pre-filled fluid and cement slurry are injected from the cement head. After the cement slurry is injected, the cement head stop pin is opened, and replacement fluid is injected. The shut-in plug 1 is then lowered. When the shut-in plug 1 is pushed to the upper end of the device cavity, the magnetic component 22 contacts the magnetic induction unit 21. After receiving the magnetic signal, the magnetic induction unit 21 sends a shut-in signal to the oil pump 5 through the wire 4. The oil pump 5 starts working and injects hydraulic oil from the first hydraulic chamber 7 into the second hydraulic chamber 10. The inner sliding sleeve 11 moves upward under the hydraulic pressure until it fits against the lower end of the fluid positioning sleeve 18, completing the shut-in operation.

[0090] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0091] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. An induction-type staged cementing tool, characterized in that, include: The main housing (2) is provided with a radially penetrating circulation hole (15); Inner sliding sleeve (11), the inner sliding sleeve (11) is disposed in the main housing (2) and forms a first hydraulic cavity (7) and a second hydraulic cavity (10) with the main housing (2), the inner sliding sleeve (11) is provided with a radially penetrating circulation port (16); Oil pump (5), the oil pump (5) being connected to the first hydraulic chamber (7) and the second hydraulic chamber (10); The oil pump (5) is capable of transferring hydraulic oil between the first hydraulic chamber (7) and the second hydraulic chamber (10) to change the volume of the first hydraulic chamber (7) and the second hydraulic chamber (10) by means of hydraulic oil, and to make the inner sleeve (11) move axially relative to the main housing (2) between an open position and a closed position. In the open position, the circulation hole (15) is aligned with the circulation port (16), and in the closed position, the circulation hole (15) and the circulation port (16) are misaligned.

2. The induction-type staged cementing tool according to claim 1, characterized in that, The main housing (2) is provided with a positioning sleeve (18) located on the upper side of the inner sliding sleeve (11) and a lower connector (13) located on the lower side of the inner sliding sleeve (11). The inner sliding sleeve (11) includes an upper part inserted into the positioning sleeve (18), a middle part sealed and joined with the inner circumferential surface of the main housing (2), and a lower part inserted into the lower connector (13). The outer diameter of the middle part is larger than the outer diameter of the upper part and the lower part. A first hydraulic cavity (7) is formed between the middle part and the positioning sleeve (18), and a second hydraulic cavity (10) is formed between the middle part and the lower connector (13).

3. The induction-type staged cementing tool according to claim 2, characterized in that, A first sealing ring (9) is provided between the middle part and the main housing (2).

4. The induction-type staged cementing tool according to claim 2, characterized in that, A first elastic element (14) is provided between the upper part and the positioning sleeve (18), and a second elastic element (17) is provided between the upper part and the lower connector (13).

5. The induction-type staged cementing tool according to claim 4, characterized in that, The upper end face is provided with a first recess to accommodate the first elastic member (14), and the lower end face is provided with a second recess to accommodate the second elastic member (17).

6. The induction-type staged cementing tool according to claim 2, characterized in that, The positioning sleeve (18) and the main housing (2) are provided with a first hydraulic channel (6) connecting the oil pump (5) and the first hydraulic chamber (7) and a second hydraulic channel (8) connecting the oil pump (5) and the second hydraulic chamber (10).

7. The induction-type staged cementing tool according to claim 1, characterized in that, It also includes a sensing element that is communicatively connected to the oil pump (5), the sensing element being able to sense signals to control the operation of the oil pump (5).

8. The induction-type staged cementing tool according to claim 7, characterized in that, The sensing element includes a pressure sensing unit (3) that is communicatively connected to the oil pump (5).

9. The induction-type staged cementing tool according to claim 7, characterized in that, The sensing element includes a magnetic induction unit (21) that is communicatively connected to the oil pump (5). The induction-type staged cementing tool includes a shut-in plug (1). A magnetic element (22) is provided at the lower end of the shut-in plug (1). The shut-in plug (1) can be inserted into the main housing (2) to couple the magnetic element (22) with the magnetic induction unit (21).

10. The induction-type staged cementing tool according to claim 7, characterized in that, The sensing element is connected to the oil pump (5) via a wire (4).

11. The induction-type staged cementing tool according to claim 7, characterized in that, The system includes an installation sleeve (19), in which the oil pump (5) and the sensing element are disposed.

12. The induction-type staged cementing tool according to claim 11, characterized in that, The mounting sleeve (19) is located on the upper side of the inner sliding sleeve (11).

13. The induction-type staged cementing tool according to claim 11, characterized in that, It also includes a battery (20) electrically connected to the oil pump (5).

14. A staged cementing device, characterized in that, Includes casing and the induction-type staged cementing tool as described in any one of claims 1-13.

15. The staged cementing equipment according to claim 14, characterized in that, The casing includes a first casing section and a second casing section. A float shoe is provided at the lower end of the first casing section, and a float collar is provided at the upper end of the first casing section. A pressure seat is provided on the float collar, and the second casing section is connected to the pressure seat. The induction-type staged cementing tool is provided on the second casing section.

16. A staged cementing method, characterized in that, The staged cementing method employs the staged cementing equipment described in claim 14 or 15.

17. The staged cementing method according to claim 16, characterized in that, include: The staged cementing equipment is lowered in; The first-stage cementing operation involves injecting pre-filled fluid and cement slurry through the cement head, followed by injection of replacement fluid. The flexible plug is inserted to press and open the induction-type staged cementing tool; Inject drilling fluid to wash out excess cement slurry; Perform a two-stage cementing operation, injecting pre-filled fluid and cement slurry, then injecting replacement fluid, and then shutting off the induction-type staged cementing tool.

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