Oil and gas well sealing section casing taking method and resonance crushing device

Abstract

The invention provides an oil and gas well sealing section sleeve taking method which comprises the steps that a sleeve is divided into multiple sections, and sleeve taking operation is sequentially conducted on all the sections of the sleeve from top to bottom; wherein the casing pipe taking operation comprises the following steps of: milling the casing pipe in sections, namely milling the bottom end of the casing pipe in sections so as to separate the casing pipe from other sections of casing pipes; the cement sheath is broken through vibration, and the cement sheath outside the section of the sleeve is broken through vibration; and the sleeve is taken out, and the section of sleeve is taken out. The invention further provides a resonance crushing device which comprises a drill column, a cable is arranged in the drill column, and the upper end of the cable is connected with a power source on the ground; the vibration head is arranged at the lower end of the drill column, the vibration head is provided with a vibration module for periodically hitting the inner wall of a casing, a driving module for driving the vibration module and a power module for providing electric energy for the driving module, and the power module is connected with the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of oil and gas well cementing section takes sleeve method and resonance breaking device, belong to oil and gas technology field. BACKGROUND

[0002] When oilfield enters the later period of development, oil-water well casing deformation, bending, rupture, broken phenomenon increases year by year, especially the casing of oil layer is broken above cement return, in the process of maintaining production in oil-water well, it can cause large area of environmental pollution.The conventional sleeve loss well treatment technology, such as packer seal, cement plugging, sleeve patching and other treatment methods have short effective period, low success rate and other technical defects, taking out damaged casing and replacing new casing become a new method to cure sleeve loss well.For the well section that cement is not cemented, cutting, back-off method can be used to take sleeve, but for the well section that cement is cemented, conventional sleeve taking method cannot be used.

[0003] In addition, for part of the drilling well, due to downhole failure, it may need to fill the well sidetracking, but due to the limitation of upper casing, the size of sidetracking borehole is limited, segment milling method is needed to mill the upper casing, if the segment milling well section is long, the construction period is long, and the operation cost is high;Or use sleeve milling method to damage the cement ring of casing annulus, generally 1-3 lengths of casing are milled at a time, and then the cutter is lowered to cut the casing or back off, the casing is lifted out and the sleeve milling operation is repeated, so the construction period is long, the operation risk is high, sleeve milling sticking is easy to occur, the well condition is more complex, and in the case that the annular gap is too small, sleeve milling operation is difficult to carry out, the casing cannot be taken out, resulting in that sidetracking operation cannot be carried out.In order to reduce the difficulty of taking out the casing of the cemented section of oil-water well and failure well, it is necessary to explore a new sleeve taking method. SUMMARY

[0004] In view of the above technical problems existing in the prior art, the present application provides an oil and gas well cementing section sleeve taking method and resonance breaking device, which can realize the taking out of the casing of the cemented section, first segment milling operation is carried out on the casing to mill a segment of operation space, then the resonance breaking device is lowered into the casing, the annular cement ring is broken by periodic hitting of the inner wall of the casing, the cement ring is vibrated and broken to make it peel off, then the casing is moved up and down, and the casing is lifted out after loosening, to complete the sleeve taking operation.

[0005] According to one aspect of the present application, an oil and gas well cementing section sleeve taking method is provided, comprising:

[0006] The casing is divided into multiple segments, and the sleeve taking operation is carried out on each segment of casing from top to bottom;

[0007] The sleeve taking operation includes:

[0008] Segment milling casing, milling the bottom end of the segment of casing to separate it from the casing of other segments;

[0009] vibrating and breaking the cement ring outside the section of casing to break the cement ring outside the section of casing;

[0010] taking out the section of casing to take out the section of casing.

[0011] Further improvement of the present application is that when milling the section of casing, the section mill tool is lowered to the predetermined casing taking-out position, the section of casing is milled to form an annular notch, so that the section of casing is separated from the other sections of casing below.

[0012] Further improvement of the present application is that the vibrating and breaking is performed by a resonance breaking device to break the cement ring.

[0013] When the resonance breaking device is used, the resonance breaking device is first lowered to the predetermined casing taking-out position, and the resonance breaking device is started to strike the inner wall of the casing while being uniformly raised, until the cement ring outside the section of casing is broken.

[0014] Further improvement of the present application is that when taking out the section of casing, the retrievable back-off spear is lowered, the section of casing is confirmed to be gripped, the section of casing is moved up and down to loosen the section of casing, and then the section of casing is raised to the drilling platform.

[0015] Further improvement of the present application is that when taking out the section of casing, the section of casing is raised from the wellhead, and then the chuck is used to release the casing, and the casing is pulled out one by one.

[0016] Further improvement of the present application is that the height of the annular notch is 0.5-2.0 meters.

[0017] According to another aspect of the present application, a resonance breaking device is also provided, comprising:

[0018] a drill string, a cable is arranged in the drill string, and the upper end of the cable is connected to a power supply on the ground; and

[0019] a vibration head arranged at the lower end of the drill string, a vibration module arranged on the vibration head to periodically strike the inner wall of the casing, a driving module arranged on the vibration head to drive the vibration module, and a power module arranged on the vibration head to provide power for the driving module, and the power module is connected to the cable.

[0020] Further improvement of the present application is that the vibration module comprises a vibration module body, a plurality of vibration plungers are arranged on the vibration module body, and the vibration plungers can be radially extended and retracted on the vibration body.

[0021] A plurality of high-strength springs are further arranged on the vibration module body, the high-strength springs are used to connect the vibration plungers, the vibration plungers are driven by the driving module to extend radially outward, and are driven by the high-strength springs to retract radially, so as to form periodic vibration.

[0022] The further improvement of the present application is that the driving module comprises a driving disc, and a central rotating shaft is arranged in the middle of the driving disc, and the central rotating shaft is connected with the power module.

[0023] The further improvement of the present application is that the driving disc is an eccentric disc or a multi-petal driving disc.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The oil and gas well sealing section sleeve taking method and the resonance breaking device can realize the taking of the sealing section sleeve, first, the sleeve is subjected to section milling operation to mill out a section of operation space, then the resonance breaking device is lowered into the sleeve, the annular cement ring is subjected to resonance breaking through periodic hitting of the inner wall of the sleeve, the cement ring is vibrated and broken to be peeled off, then the sleeve is moved up and down, the sleeve is lifted out after being loosened, and the sleeve taking operation is completed.

[0026] The sleeve taking method provided by the present application can take out the sleeve in the cement sealing state, and provides operation space for replacing the sleeve of the casing damage well, window sidetracking of the fault well and the like.

[0027] The resonance breaking device in the present application can break the cement ring in the sleeve, changes the cementing state between the sleeve and the formation, and makes the sleeve in a free state.

[0028] Compared with the conventional sleeve milling mode, the present application is operated in the sleeve, the sleeve milling barrel is not stuck in the hole, the downhole condition is not complicated, and the present application is safe and reliable, and has a wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0029] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which:

[0030] Figure 1 Fig. 1 is a structural schematic view of a resonance breaking device according to an embodiment of the present application.

[0031] Figure 2 Fig. 2 is a structural schematic view of a vibration head according to an embodiment of the present application, showing that the driving module is an eccentric disc.

[0032] Figure 3 Fig. 3 is a structural schematic view of a vibration head according to an embodiment of the present application, showing that the driving module is a multi-petal driving disc.

[0033] The drawings are not drawn according to the actual scale.

[0034] In the drawings, the meanings of the reference signs are as follows:

[0035] 1, drill string, 2, vibration head, 11, cable, 21, vibration module, 22, drive module, 23, power module, 24, vibration plunger, 25, high-strength spring, 26, eccentric disc, 27, multi-petal drive disc, 28, central rotating shaft. DETAILED DESCRIPTION

[0036] In order to make the technical solutions and advantages of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive enumeration of all embodiments. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0037] When the oil field enters the later stage of development, the deformation, bending, rupture and breakage of the casing of oil and water wells increase year by year, especially the casing of the oil layer is broken above the cement return, which will cause large-area environmental pollution during the production process of the oil and water wells. The conventional casing damage well treatment technology, such as packer sealing, cement plugging, casing patching and other treatment methods, has technical defects such as short effective period and low success rate, and taking out the damaged casing and replacing it with a new casing becomes a new method to radically cure the casing damage well. For the well section that is not cemented, cutting and back-off methods can be used to take out the casing, but for the well section that is cemented, the conventional casing taking method cannot be used.

[0038] In addition, for part of the drilling well, due to downhole failure, it may be necessary to fill the sidetracking, but due to the limitation of the upper casing, the size of the sidetracking borehole is limited, and the upper casing needs to be milled away by segment milling, if the segment milling section is long, the construction period is long and the operation cost is high; or the cement ring in the annulus outside the casing is damaged by casing milling, generally 1-3 lengths of casing are milled at a time, and then a cutter is lowered to cut the casing or back off, the casing is lifted out and the casing milling operation is repeated, and the construction period is long, the operation risk is high, casing milling sticking is easy to occur, the well condition is more complex, and in the case that the annular space is too small, casing milling operation is difficult to perform, the casing cannot be taken out, and the sidetracking operation cannot be performed. In order to reduce the difficulty of taking out the casing of the cemented section of the oil and water well and the failure well, it is necessary to explore a new casing taking method.

[0039] The present method provides a casing taking method for the cemented section of an oil and gas well, which can solve the above problems. The cement ring can be broken by vibration, so that the casing of the cemented section of the oil and gas well can be detached, thereby facilitating the taking out.

[0040] Figure 1 The resonance breaking device is shown schematically, and a casing taking method for the cemented section of an oil and gas well is realized by the vibration breaking device,

[0041] The method comprises the following steps:

[0042] The casing is divided into multiple sections, and the casing is taken out from top to bottom;

[0043] The taking-out operation includes:

[0044] The section of the casing is milled, and the bottom end of the section of the casing is milled to separate the casing from other sections of the casing;

[0045] The cement ring outside the section of the casing is broken by vibration;

[0046] The section of the casing is taken out.

[0047] In the method for taking out the casing in the cemented section of the oil and gas well according to the embodiment, the casing is divided into multiple sections by sectioning, and the casing is taken out from top to bottom. If the entire casing is taken out, on the one hand, the weight is large, and it is not convenient to take out; on the other hand, the broken cement ring is easy to cause a problem that a section is not completely broken, which affects the taking out.

[0048] In the taking-out operation of the casing, the cement ring is broken by vibration, which can effectively separate the casing from the formation, thereby facilitating the taking out of the casing.

[0049] In one embodiment, when the section of the casing is milled, the section milling tool is lowered to a predetermined casing taking-out position, which is preferably the bottom end of the pre-divided section of the casing, and a ring-shaped notch is milled on the casing, so that the section of the casing is separated from other sections of the casing below.

[0050] In a preferred embodiment, the vibration breaking is performed on the cement ring by a resonance breaking device.

[0051] When the resonance breaking device is used, the resonance breaking device is first lowered to a predetermined casing taking-out position, and the resonance breaking device strikes the inner wall of the casing while being pulled up at a constant speed until the cement ring outside the section of the casing is broken.

[0052] Specifically, the resonance breaking device is lowered to a position where a notch is formed at the lower end of the section of the casing, and the resonance breaking device is started. The resonance breaking device continuously strikes the inner wall of the casing periodically, and the cement ring is vibrated and peeled off by resonance between the resonance breaking device and the cement ring outside the casing. The cement ring is vibrated from bottom to top during the pulling up of the resonance breaking device, so that the entire cement ring is peeled off. The casing without the cement ring is in a free state, and then the resonance breaking device is pulled out.

[0053] In one embodiment, when the casing is taken out, the casing is confirmed to be gripped by lowering the retractable back-off spear, and then the casing is moved up and down in a small range. The small range can be determined according to actual conditions, for example, within 10 cm, or within 1 m, or within several meters. By moving the casing, the casing can be separated from the broken cement ring outside the casing, and adhesion can be avoided. After the casing is loosened, the casing is lifted to the drilling platform, the coupling is removed, and the casing is pulled out.

[0054] In another embodiment, when the casing is taken out, the casing is pulled out from the wellhead, and then the coupling is removed using the chuck after being lifted.

[0055] In one embodiment, the height of the annular gap is 0.5-2.0 m.

[0056] According to another aspect of the present application, a resonance breaking device is also provided, which can be applied to the casing taking method of the sealing section of the oil and gas well as described in the above embodiments, and the cement ring is broken by vibration through the resonance breaking device.

[0057] In the embodiment as shown in Figure 1 The resonance breaking device comprises a drill string 1 and a vibration head 2 arranged at the bottom end of the drill string 1.

[0058] The inside of the drill string 1 is provided with a cable 11, the upper end of the cable 11 is connected to the power supply at the wellhead, the lower end is connected to the vibration head 2, and the vibration head 2 is provided with electric energy.

[0059] The vibration head 2 is provided with a vibration module 21, which is configured to be able to vibrate periodically, so as to hit the inner wall of the casing.

[0060] The vibration head 2 is also provided with a driving module 22, the vibration module 21 is connected to the driving module 22, and the driving module 22 drives the vibration module 21 to vibrate.

[0061] The vibration head 2 is also provided with a power module 23, the power module 23 is connected to the cable 11 and the driving module 22 respectively, and provides power for the driving module 22.

[0062] In the resonance breaking device according to the present embodiment, the vibration head 2 is lowered into the well through the drill string 1, the inside of the drill string 1 can contain the cable 11, the upper end of the cable 11 is connected to the power supply, and the lower end is connected to the power module 23 of the vibration head 2. The power module 23 rectifies the electric energy and provides power for the driving module 22, the driving module 22 drives the vibration module 21 to vibrate, so as to impact the casing and break the cement ring by vibration.

[0063] In one embodiment, the vibration module 21 includes a vibration module body fixed to the vibration head 2. The vibration module body is provided with a plurality of vibration plungers 24, the number of which is greater than three, preferably four or more. The vibration plungers 24 are capable of radial extension and retraction on the vibration module body.

[0064] The vibration module body is also provided with several high-strength springs 25. One side of the high-strength spring 25 is connected to the vibration module body, and the other side is connected to the vibration plunger 24. The vibration plunger 24 extends radially outward under the drive of the drive module 22, and then retracts radially under the elastic force of the high-strength spring 25, thereby forming periodic vibration.

[0065] Since the drive module 22 periodically drives the vibrating plunger 24 to overcome the elastic force of the high-strength spring 25 and move radially outward, the vibrating plunger 24 can periodically extend and retract, thereby periodically impacting the inner wall of the casing, causing the cement ring outside the casing to resonate, which is beneficial to the breaking of the cement ring.

[0066] In one embodiment, the drive module 22 includes a drive disk, and a central rotating shaft 28 is provided in the middle of the drive disk, the central rotating shaft 28 being connected to the power module 23.

[0067] In one embodiment, the drive disk is an eccentric disk 26 or a multi-lobed drive disk 27.

[0068] Preferably, such as Figure 2 As shown, the power module 23 includes an eccentric disk 26, and a central rotating shaft 28 is provided in the middle of the eccentric disk 26. The central rotating shaft 28 is connected to the power module 23.

[0069] In this embodiment, the eccentric disk 26 is preferably a cylinder with an elliptical cross-section. One end of its major axis drives the vibrating plunger 24 to extend outward, while the side of its minor axis does not contact the vibrating plunger 24. Thus, when the eccentric disk 26 rotates, the major axis periodically pushes the vibrating plunger 24 to extend outward, while the side of the minor axis cannot contact the vibrating plunger 24, thereby causing the inner side of the vibrating plunger 24 to lose support and retract inward under the drive of the high-strength spring 25, completing one cycle of extension and vibration.

[0070] In this embodiment, each vibrating plunger 24 vibrates asynchronously by being driven by the eccentric disk 26. For example, there are 4 vibrating plungers 24, in which two opposite vibrating plungers 24 vibrate synchronously and two adjacent vibrating plungers 24 vibrate asynchronously.

[0071] In another embodiment, such as Figure 3 As shown, the power module 23 includes a multi-lobed drive disk 27, and a central rotating shaft 28 is provided in the middle of the multi-lobed drive disk 27.

[0072] The multi-petal driving disc 27 comprises a plurality of semi-elliptical or arc-shaped driving convex edges, the number of the driving convex edges is the same as the number of the vibrating plungers 24, the vibrating plungers 24 are pushed to move outward when the driving convex edges move to the positions of the vibrating plungers 24, the vibrating plungers 24 extend outward against the elastic force of the high-strength springs 25, and the vibrating plungers 24 retract inward under the elastic force of the high-strength springs 25 when the driving convex edges rotate to the positions between the two vibrating plungers 24.

[0073] Preferably, the power module is an electric motor.

[0074] The oil and gas well sealing section sleeve taking method and the resonance breaking device can realize the taking of the sealing section sleeve. First, the sleeve is subjected to section milling operation to mill out a section of operation space. Then, the resonance breaking device is lowered into the sleeve to break the cement sheath in the annulus through periodic hitting of the inner wall of the sleeve to vibrate and break the cement sheath to make it peel off. Then, the sleeve is moved up and down until the sleeve is loosened and is pulled out to complete the sleeve taking operation.

[0075] The oil and gas well sealing section sleeve taking method can take out the sleeve in the cement sealing state to provide operation space for replacing the sleeve of the casing damage well, window sidetracking of the fault well and the like.

[0076] The resonance breaking device can break the cement sheath in the sleeve to change the cementing state between the sleeve and the formation to make the sleeve in a free state.

[0077] Compared with the conventional sleeve milling method, the oil and gas well sealing section sleeve taking method and the resonance breaking device are operated in the sleeve, there is no risk of the sleeve milling barrel sticking, the downhole condition is not complicated, and the method is safe and reliable and has a wide application range.

[0078] The embodiments will be described below in detail.

[0079] Embodiment 1

[0080] An oil and gas well sealing section sleeve taking method solves the problem that the cement sealing well section sleeve is cemented with the cement sheath and the formation and cannot be taken out. The method comprises the following steps.

[0081] The sleeve is divided into multiple sections, and the sleeve taking operation is sequentially performed on each section of the sleeve from top to bottom.

[0082] The specific method of the sleeve taking operation comprises the following steps.

[0083] Step 1: According to the inner diameter size of the sleeve, a matched sleeve section milling tool is lowered into the sleeve to a predetermined sleeve taking position, the sleeve collar position is avoided, the sleeve section milling section is about 0.5-2.0 meters to form a ring-shaped notch to provide an operation surface for the next step construction.

[0084] Step two, after the completion of the segment milling, connect the resonance breaking device + drill string 1 inside the cable 11, send the resonance breaking device to the casing annular gap;

[0085] Uniformly raise the drill string 1, use the cable 11 to transmit electrical energy to the resonance breaking device, drive the vibrating plunger 24 to continuously hit the inner wall of the casing, make it resonate with the cement ring outside the pipe, and vibrate the cement ring to make it peel off, the casing without the cement ring is in a free state, and then the resonance breaking device is pulled out;

[0086] Step three, lower the retractable back-off spear, confirm that the casing is caught, and move the casing up and down in a small range to loosen the casing, then raise the casing to the drilling platform, remove the coupling, and then pull out the casing;

[0087] Step four, repeat the above steps until all casings above the segment milling segment in the well are removed.

[0088] Example 2

[0089] A method for removing casing in a cemented well section, which solves the problem that the casing in the cemented well section is cemented with the cement ring and the formation, and cannot be removed, the method comprising the following steps:

[0090] The casing is divided into multiple sections, and each section of casing is sequentially subjected to casing removal operation from top to bottom.

[0091] The specific method of the casing removal operation comprises the following steps:

[0092] Step one, according to the inner diameter size of the casing, lower the matched casing segment milling tool to the predetermined casing removal position, avoid the casing coupling position, segment mill the well section by about 0.5-2.0 meters, form an annular gap, and provide an operation surface for the next step construction;

[0093] Step two, after the completion of the segment milling, connect the resonance breaking device + drill string 1 inside the cable 11, send the resonance breaking device to the casing annular gap;

[0094] Uniformly raise the drill string 1, use the cable 11 to transmit electrical energy to the resonance breaking device, drive the vibrating plunger 24 to continuously hit the inner wall of the casing, make it resonate with the cement ring outside the pipe, and vibrate the cement ring to make it peel off, the casing without the cement ring is in a free state, and then the resonance breaking device is pulled out;

[0095] Step three, start casing from the wellhead, raise it, use the chuck to remove the coupling, and pull out each casing;

[0096] Step four, repeat the above steps until all casings above the segment milling segment in the well are removed.

[0097] Example 3

[0098] A resonance breaking device, comprising:

[0099] a drill string 1, a cable 11 is arranged in the drill string 1, an upper end of the cable 11 is connected to a power supply on the ground; and

[0100] a vibration head 2 is arranged at a lower end of the drill string 1, the vibration head 2 is provided with a vibration module 21 for periodically hitting an inner wall of a casing, a driving module 22 for driving the vibration module 21, and a power module 23 for providing power for the driving module 22, the power module 23 is connected to the cable 11.

[0101] the vibration module 21 comprises a vibration module body, a plurality of vibration plungers 24 are arranged on the vibration module body, the vibration plungers 24 can be radially extended and retracted on the vibration body;

[0102] a plurality of high-strength springs 25 are further arranged on the vibration module body, the high-strength springs 25 are used to connect the vibration plungers 24, the vibration plungers 24 are driven by the driving module 22 to extend radially outward, and are driven by the high-strength springs 25 to retract radially, thereby forming periodic vibration.

[0103] the driving module 22 comprises a driving disc, a central rotating shaft 28 is arranged in a middle part of the driving disc, the central rotating shaft 28 is connected to the power module 23.

[0104] the driving disc is an eccentric disc 26.

[0105] Embodiment 4

[0106] A resonance breaking device, comprising:

[0107] a drill string 1, a cable 11 is arranged in the drill string 1, an upper end of the cable 11 is connected to a power supply on the ground; and

[0108] a vibration head 2 is arranged at a lower end of the drill string 1, the vibration head 2 is provided with a vibration module 21 for periodically hitting an inner wall of a casing, a driving module 22 for driving the vibration module 21, and a power module 23 for providing power for the driving module 22, the power module 23 is connected to the cable 11.

[0109] the vibration module 21 comprises a vibration module body, a plurality of vibration plungers 24 are arranged on the vibration module body, the vibration plungers 24 can be radially extended and retracted on the vibration body;

[0110] a plurality of high-strength springs 25 are further arranged on the vibration module body, the high-strength springs 25 are used to connect the vibration plungers 24, the vibration plungers 24 are driven by the driving module 22 to extend radially outward, and are driven by the high-strength springs 25 to retract radially, thereby forming periodic vibration.

[0111] The driving module 22 comprises a driving disc, the middle part of the driving disc is provided with a central rotating shaft 28, and the central rotating shaft 28 is connected with the power module 23.

[0112] The driving disc is a multi-petal driving disc 27.

[0113] The oil and gas well sealing section sleeve taking method and the resonance breaking device can realize the taking of the sealing section sleeve, first, the sleeve is subjected to section milling operation to mill out a section operation space, then the resonance breaking device is lowered into the sleeve, the annular cement sheath is subjected to resonance breaking through periodic hitting of the inner wall of the sleeve, the cement sheath is vibrated and broken to be peeled off, then the sleeve is moved up and down, the sleeve is lifted out after being loosened, and the sleeve taking operation is completed.

[0114] The sleeve taking method provided by the patent can take out the sleeve in the cement sealing state, and provides an operation space for replacing the sleeve of the casing damage well, window sidetracking of the fault well and the like.

[0115] The resonance breaking device in the application can break the cement sheath in the sleeve, changes the cementing state between the sleeve and the formation, and makes the sleeve in a free state.

[0116] Compared with the conventional sleeve milling mode, the method is operated in the sleeve, there is no risk of sleeve milling cylinder sticking, the downhole condition is avoided to be complicated, and the method has the characteristics of safety and reliability and wide application range.

[0117] It should be understood that the embodiments disclosed in the present application are not limited to the specific structure, processing steps or materials disclosed herein, but should extend to the equivalent alternatives of these features understood by those skilled in the related art. It should also be understood that the terms used herein are only for the purpose of describing the specific embodiments and do not mean limitation.

[0118] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not mean or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0119] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0120] Certain terms are used throughout the present application to refer to particular system components. As one skilled in the art will appreciate, the same component can be referred to by different names and can be used according to different protocols, but as would be accepted by those skilled in the art, the different names and protocols do not affect the nature of the component. The phrase "one embodiment" or "an embodiment" appearing in the specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearance of the phrase "one embodiment" or "an embodiment" throughout the specification does not necessarily refer to the same embodiment.

[0121] Embodiments of the present application are presented for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application in order to design various embodiments with various modifications for particular uses according to the principles of the application.

[0122] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they have the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications falling within the scope of the present application, and changes and / or modifications made to the embodiments according to the present application should be covered within the scope of protection of the present application.

Claims

1. A method of casing a wellbore section, comprising: The application relates to a method for taking out a casing pipe from a well. The casing pipe is divided into multiple sections, and the casing pipe of each section is taken out from top to bottom. The taking-out operation comprises: sectionally milling the casing pipe, milling the bottom end of the section of the casing pipe to separate the section of the casing pipe from other sections of the casing pipe; vibrating and breaking the cement ring outside the section of the casing pipe; taking out the section of the casing pipe.

2. The method of claim 1, wherein, When the section of the casing pipe is milled, the section milling tool is lowered to a predetermined casing pipe taking-out position, and a ring-shaped notch is milled on the casing pipe, so that the section of the casing pipe is separated from other sections of the casing pipe.

3. The method of claim 2, wherein, The vibrating and breaking is performed by a resonance breaking device on the cement ring. When the resonance breaking device is used, the resonance breaking device is first lowered to the predetermined casing pipe taking-out position, and the resonance breaking device strikes the inner wall of the casing pipe while being uniformly lifted, until the cement ring outside the section of the casing pipe is broken.

4. The method of claim 3, wherein, When the section of the casing pipe is taken out, a retractable back-off spear is lowered, the casing pipe is gripped after the casing pipe is gripped, the casing pipe is moved up and down to loosen the casing pipe, and the casing pipe is lifted to the drilling platform, the back-off is removed, and the casing pipe is lifted out.

5. The method of claim 3, wherein, When the section of the casing pipe is taken out, the casing pipe is lifted from the wellhead, the chuck is removed after the casing pipe is lifted, and the casing pipe is lifted out.

6. The method of claim 4 or 5, wherein, The height of the ring-shaped notch is 0.5-2.0 m.

7. A resonance breaking device, characterized by The application relates to a drilling device. The drilling device comprises a drill string (1) and a vibration head (2). The drill string (1) is provided with a cable (11), and the upper end of the cable (11) is connected to a power supply on the ground. The vibration head (2) is arranged at the lower end of the drill string (1), and the vibration head (2) is provided with a vibration module (21) for periodically striking the inner wall of the casing pipe, a driving module (22) for driving the vibration module (21) and a power module (23) for providing power for the driving module (22), and the power module (23) is connected to the cable (11).

8. The resonance crushing device according to claim 7, characterized in that The vibration module (21) comprises a vibration module body, and a plurality of vibration plungers (24) are arranged on the vibration module body and can be radially extended and retracted on the vibration body. A plurality of high-strength springs (25) are arranged on the vibration module body and are used for connecting the vibration plungers (24).

9. The resonance crushing device according to claim 8, characterized in that The vibration plungers (24) are driven by the driving module (22) to be radially extended outward and are driven by the high-strength springs (25) to be radially retracted, so that periodic vibration is formed.

10. The resonance crushing device according to claim 8, characterized in that The driving module (22) comprises a driving disc, and a central rotating shaft (28) is arranged in the middle of the driving disc and is connected to the power module (23). The driving disc is an eccentric disc (26) or a multi-limb driving disc (27).

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