Well cementation casing device and well drilling system

Abstract

The invention provides a well cementation casing device and a well drilling system, and relates to the technical field of well drilling. The well cementation casing device comprises a casing body which is used for being placed in a well. At least one flow guide groove is formed in the side wall of the sleeve body, extends in the length direction of the sleeve body and penetrates through the end faces of the two ends of the sleeve body. The filling material is wrapped in the packaging bag and is arranged in the flow guide groove; the cutting piece is arranged in the flow guide groove, the cutting piece comprises a cutting part and a traction part which are connected with each other, the cutting part is located on one side of the filling material, and the traction part is arranged along the flow guide groove and extends towards the outside of the sleeve body; wherein the cutting piece can be controlled to extend out of the filling material side through the traction part located outside the sleeve body, so that the cutting piece can scratch the packaging bag. According to the technical scheme, the field operation process can be simplified, the dependence on complex slurry preparation and high-precision pump injection is reduced, and the well cementation efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of drilling technology, and in particular to a cementing casing device and drilling system. Background Technology

[0002] In the drilling and production process, cementing is a key procedure to ensure the integrity of the wellbore structure, prevent the cross-contamination of formation fluids, protect groundwater resources, and maintain the stability of the wellbore.

[0003] For loose, highly permeable, and easily collapsible formations such as surface gravel and loess layers, existing cementing techniques typically use ordinary oil well cement (such as Grade G cement) to prepare cement slurry, which is then injected into the annulus through the casing to displace the drilling fluid and allow it to solidify to form a cement sheath. However, this process not only involves numerous steps and requires strict parameter control, but also presents significant challenges in on-site preparation and is highly dependent on the experience of the operators.

[0004] Therefore, a cementing casing device is needed to at least solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a cementing casing device to simplify the on-site operation process, reduce reliance on complex slurry preparation and high-precision pumping, and improve cementing efficiency.

[0006] To address the aforementioned technical problems, this application provides the following technical solutions:

[0007] This application provides a cementing casing device, comprising: a casing body for placement in a well; at least one flow channel is provided in the side wall of the casing body, the flow channel extending along the length of the casing body and penetrating the end faces of both ends of the casing body; a filler material, the filler material being wrapped in a packaging bag and disposed within the flow channel; a cutting component disposed within the flow channel, the cutting component comprising a cutting part and a traction part connected to each other, the cutting part being located on one side of the filler material, and the traction part being disposed along the flow channel and extending outward from the casing body; wherein, the traction part located outside the casing body can control the cutting component to extend towards the filler material side, so that the cutting component can cut through the packaging bag.

[0008] In some embodiments of this application, the guide groove includes a first surface and a second surface opposite to each other, wherein the first surface is close to the inner wall surface of the sleeve body; the sleeve body is also provided with at least one placement groove extending toward the inner wall surface on the first surface, the placement groove is in communication with the guide groove, and the cutting part is disposed in the placement groove.

[0009] In some embodiments of this application, the placement groove includes a third surface that connects to the first surface, and the groove opening size gradually decreases along the direction from the first surface to the inner wall surface, so that the third surface is formed as an inclined surface with an angle to the first surface; the cutting part includes a first end and a second end that are disposed opposite to each other in a direction parallel to the first surface, the first end being rotatably connected to the traction part, and the second end being disposed close to and opposite to the third surface.

[0010] In some embodiments of this application, the traction part is a steel wire, with both ends of the steel wire extending toward both ends of the sleeve body, and the routing shape of the steel wire in the mounting groove is adapted to the shape of the mounting groove; the cutting part is a blade, and the steel wire has an installation space that penetrates it, the installation space being adapted to the size of the blade, and the blade being disposed in the installation space and rotatably connected to the steel wire.

[0011] In some embodiments of this application, the casing body includes a male thread end and a female thread end located opposite each other at both ends. The male thread end is a protruding end face extending outward from the casing body, and the female thread end is a recessed end face extending inward from the casing body. In a state where multiple casing bodies are placed sequentially in the well, the male thread end of one casing body can be connected to the female thread end of another casing body.

[0012] In some embodiments of this application, a plurality of flow guide grooves are provided in the side wall of the casing body, and the plurality of flow guide grooves are spaced apart along the circumference of the casing body; wherein, the flow guide grooves of the plurality of casing bodies located in the well are connected to each other, and the two ends of the steel wire are respectively connected to magnetic attractors, and the steel wires in two connected flow guide grooves are connected by the magnetic attractors.

[0013] In some embodiments of this application, the sleeve body further includes a pair of support portions disposed within the guide groove. The pair of support portions are respectively disposed near the end faces of both ends of the sleeve body, and the pair of support portions are used to support the filling material; the filling material is polyurethane foam.

[0014] In some embodiments of this application, the sleeve body further includes an annular sealing portion disposed at the male thread end, the annular sealing portion being connected to the inner wall surface, and the outer diameter of the annular sealing portion being equal to the inner diameter of the sleeve body.

[0015] In some embodiments of this application, the sleeve body includes a main body and a cover. The main body is formed by casting a support frame and cement, and the formed main body has a pre-set groove structure. The cover is connected to the main body at the position where the groove structure is to form the guide channel.

[0016] This application also provides a drilling system including the above-described cementing casing device.

[0017] Compared to existing technologies, the cementing casing device provided in this application pre-fabricates the filling material within the casing body. On-site, the cementing reaction is triggered simply by controlling the traction unit, providing a leak-proof and stable space for subsequent drilling. This eliminates the need for traditional, complex cement slurry preparation, pumping, and displacement processes, avoiding cement slurry loss due to drilling fluid leakage in permeable formations. It also reduces cement usage and waste mud generation, preventing repeated operations due to cementing failures and lowering costs. Attached Figure Description

[0018] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0019] Figure 1 A schematic diagram of the cementing casing device according to an embodiment of this application is shown.

[0020] Figure 2 A schematic front view of a cementing casing apparatus according to an embodiment of this application is shown;

[0021] Figure 3 for Figure 2 Schematic diagram of the DD cross-sectional structure;

[0022] Figure 4 A side view of a cementing casing apparatus according to an embodiment of this application is shown schematically;

[0023] Figure 5 for Figure 4 A schematic diagram of the EE cross-sectional structure;

[0024] Figure 6 A partially enlarged schematic diagram of the cutting component in the cementing casing device according to an embodiment of this application is shown.

[0025] Figure 7 The diagram schematically illustrates a cross-sectional view of the cutting element located in the casing body in the cementing casing device of an embodiment of this application;

[0026] Figure 8 The schematic diagram illustrates the male thread end structure of the casing body in the cementing casing device of this application embodiment;

[0027] Figure 9 The schematic diagram illustrates the female thread end structure of the casing body in the cementing casing device of this application embodiment;

[0028] Figure 10 The diagram illustrates the structure of the cementing casing device according to an embodiment of this application, where the male thread end includes an annular sealing part and the female thread end includes a snap-fit ​​part.

[0029] Figure 11 This schematically illustrates another embodiment of the cementing casing device according to the present application, in which the male thread end includes an annular sealing part and the female thread end includes a snap-fit ​​part;

[0030] Figure 12 schematically shown Figure 11 A bottom view of the annular sealing part including the claw structure;

[0031] Figure 13 The diagram illustrates a cross-sectional view of the female thread end of the cementing casing device according to an embodiment of this application, which includes a groove structure.

[0032] Figure 14 A schematic diagram illustrating the assembly state of the cementing casing device according to an embodiment of this application is shown.

[0033] Explanation of icon numbers:

[0034] 1. Sleeve body; 101. Guide groove; 1011. First surface; 1012. Second surface; 102. Installation groove; 1021. Third surface; 103. Male thread end; 104. Female thread end; 105. Support part; 106. Annular sealing part; 107. Snap-fit ​​part; 108. Claw structure; 109. Slot structure; 110. First docking area; 111. Second docking area; 2. Cutting component; 201. Cutting part; 202. Traction part; 2021. Installation space; 3. Magnetic suction component. Detailed Implementation

[0035] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0037] Example 1

[0038] This application provides a cementing casing device, such as... Figures 1 to 5As shown, the casing includes: a casing body 1 for placement inside a well; at least one guide groove 101 is provided in the side wall of the casing body 1, the guide groove 101 extends along the length of the casing body 1 and penetrates the end faces of both ends of the casing body 1; a filling material, the filling material is wrapped in a packaging bag and disposed in the guide groove 101; a cutting element 2, disposed in the guide groove 101, the cutting element 2 includes a cutting part 201 and a traction part 202 connected to each other, the cutting part 201 is located on one side of the filling material, and the traction part 202 is disposed along the guide groove 101 and extends outward from the casing body 1; wherein, the traction part 202 located outside the casing body 1 can control the cutting element 2 to extend towards the filling material side so that the cutting element 2 can cut through the packaging bag.

[0039] One or more cementing casing units can be lowered into the drilled wellbore to support the wellbore wall.

[0040] The casing body 1 can be a metal pipe or a composite material tubular structure used in conventional drilling. At least one guide groove 101 is formed along the axial direction (i.e., the length direction) inside the sidewall of the casing body 1, penetrating both end faces to form a through channel. Filling material is pre-placed within the guide groove 101. This filler material can be composed of rapid-hardening cement, expansive cement, polyurethane foam, or other polymeric sealing materials. The filler material is sealed in a ruptureable flexible packaging bag to prevent premature leakage from the guide groove 101 during transportation and installation of the casing body 1.

[0041] The cutting component 2 includes a cutting part 201 and a traction part 202. The cutting part 201 is disposed in the guide channel 101 and located on the side of the filling material, and can be a sharp blade, a serrated structure, or a sharp protrusion. The drive end of the traction part 202 is connected to the cutting part 201, and the traction part 202 extends along the guide channel 101 to the outside of the sleeve body 1. The traction part 202 can be a pull rope or a cable. The cable can be connected to a motor on the ground, and the operator can control it manually or electrically from the ground.

[0042] In use, the casing body 1, equipped with the filler material and cutting component 2, can be lowered into the target formation within the well to the designed depth. After the casing body 1 is installed, the operator can control the traction unit 202 from the ground to drive the cutting component 201 towards the filler material. The cutting component 201 can puncture the packaging bag, releasing the filler material into the guide channel 101. Since the guide channel 101 runs through the inside and outside of the casing body 1, when the packaging bag is punctured, the filler material inside is released from the guide channel 101 under its own weight or formation pressure, entering the annular space between the casing and the well wall. The filler material can rapidly expand or solidify, thereby forming a tight sealing layer in the loose formation, achieving localized enhanced cementing.

[0043] The cementing casing device provided in this application embodiment is suitable for environments with severe seepage and easy collapse in surface gravel and loess layers, and where drilling mud pollutes water sources. By pre-fabricating the filling material inside the casing body 1, the cementing reaction can be triggered on-site simply by controlling the operation of the traction unit 202, providing a seepage-free, leak-free, and stable space for subsequent drilling. It eliminates the need for traditional, complex cement slurry preparation, pumping, and displacement processes, avoiding cement slurry loss due to drilling fluid leakage in seeping formations, reducing cement usage and waste mud generation, avoiding repeated operations due to cementing failures, and lowering costs.

[0044] In some embodiments, such as Figure 7 As shown, the guide channel 101 includes a first surface 1011 and a second surface 1012 facing each other, wherein the first surface 1011 is close to the inner wall surface of the sleeve body 1; the sleeve body 1 is also provided with at least one placement groove 102 extending toward the inner wall surface located on the first surface 1011, the placement groove 102 is connected to the guide channel 101, and the cutting part 201 is disposed in the placement groove 102.

[0045] The guide groove 101 extends axially along the casing body 1 and passes through both ends, having two opposing inner surfaces. The first surface 1011 is close to the inner wall of the casing body 1 (i.e., the side facing the center of the wellbore), and the second surface 1012 is close to the outer wall of the casing body 1 (i.e., the side facing the annulus of the wellbore).

[0046] At least one placement groove 102 is formed on the first surface 1011 of the flow channel 101. The placement groove 102 extends recessedly from the first surface 1011 toward the inner wall surface of the sleeve body 1 and communicates with the interior of the flow channel 101 to form an embedded chamber. The cutting part 201 (such as a blade, spike, or serrated structure) is pre-installed in the placement groove 102, so that it is initially hidden inside the placement groove 102 and does not protrude from the first surface 1011, thereby avoiding premature cutting of the packaging bag containing the filling material in the flow channel 101.

[0047] The cutting section 201 and the traction section 202 can be rigidly or flexibly connected. The traction section 202 is arranged along the guide channel 101 and is led out from the end of the casing body 1. When the operator pulls or controls the traction section 202 on the ground, the cutting section 201 is forced to slide or rotate out of the placement groove 102 toward the inside of the guide channel 101. After the cutting section 201 extends, it can act on the packaging bag located in the guide channel 101, cut it, and allow the filling material to flow through the guide channel 101 to the annulus outside the casing body 1 under the drive of gravity, liquid column pressure, etc., to achieve local sealing and cementing.

[0048] By providing a placement groove 102 inside the sleeve body 1 to accommodate and guide the movement of the cutting part 201, the cutting part 201 is completely embedded in the placement groove 102 when not activated, and does not protrude from the first surface 1011, thus preventing premature damage to the packaging bag during the lowering of the sleeve body 1, which could lead to premature or accidental leakage of the filling material.

[0049] In some embodiments, such as Figure 7 As shown, the placement groove 102 includes a third surface 1021 that connects to the first surface 1011. The size of the groove opening of the placement groove 102 gradually decreases along the direction from the first surface 1011 to the inner wall surface, so that the third surface 1021 is formed as an inclined surface with an angle to the first surface 1011. The cutting part 201 includes a first end and a second end that are arranged opposite to each other in a direction parallel to the first surface 1011. The first end is rotatably connected to the traction part 202, and the second end is close to and opposite to the third surface 1021.

[0050] The placement groove 102 is formed on the first surface 1011 of the guide groove 101, with its opening located on the first surface 1011 and its bottom extending to a position close to the inner wall surface of the sleeve body 1. The size of the opening of the placement groove 102 gradually decreases from the first surface 1011 towards the inner wall surface, so that the placement groove 102 as a whole can have a constricted or wedge-shaped structure, such as a funnel shape or an inverted trapezoidal shape. The side wall surface of the placement groove 102 is defined as the third surface 1021, which is an inclined surface forming a certain angle with the first surface 1011.

[0051] The cutting section 201 can adopt a plate-like or sheet-like structure, having a first end and a second end arranged opposite each other along a direction parallel to the first surface 1011. The first end can be rotatably connected to the traction section 202 via a pin, hinge, or other rotating pair. The second end is a free end and may have a sharp cutting edge or barbs for piercing the packaging bag containing the filling material. In the initial state, the cutting section 201 is entirely housed within the placement groove 102, parallel to the first surface 1011, and does not protrude from the first surface 1011, ensuring a smooth inner wall and no interference during the lowering of the sleeve.

[0052] After the casing body 1 is lowered into the target formation, the operator can pull the traction unit 202 from the ground. Under the traction force, the first end of the cutting part 201 is driven to move along the axial direction of the casing body 1. At the same time, since it is rotatably connected to the traction unit 202, the cutting part 201 will rotate around the rotation point. During this process, the second end moves towards the third surface 1021 of the placement groove 102, and under the resistance and guidance of the inclined third surface 1021, it gradually deflects outward along the inclined surface, and finally extends into the guide channel 101. The extended second end can directly contact and cut the packaging bag located in the guide channel 101, thereby releasing the filling material inside.

[0053] By configuring the placement groove 102 with a tapered structure featuring an inclined third surface 1021, and cooperating with the rotating cutting section 201, the third surface 1021 can guide and limit the cutting section 201 during its triggering process. Only a small traction force is required to drive the cutting section 201 to quickly and reliably complete the bag-breaking action. This creates a low-resistance, highly reliable, and highly safe built-in triggering bag-breaking mechanism, significantly improving the accuracy and stability of cementing operations.

[0054] In some embodiments, such as Figure 6 As shown, the traction part 202 is a steel wire pull line, with both ends of the steel wire pull line extending towards both ends of the sleeve body 1. The routing shape of the steel wire pull line in the mounting groove 102 is adapted to the shape of the mounting groove 102. The cutting part 201 is a blade, with the steel wire pull line having an installation space 2021 that runs through it. The installation space 2021 is adapted to the size of the blade, and the blade is set in the installation space 2021 and rotatably connected to the steel wire pull line.

[0055] The traction unit 202 can be made of high-strength and flexible steel wire, such as stainless steel wire. The steel wire runs through the entire guide groove 101 and extends from both ends of the casing body 1, facilitating traction control by the operator at the wellhead. When passing through the area of ​​the placement groove 102, the path of the steel wire conforms to the contour of the placement groove 102, ensuring that its connection point with the cutting unit 201 is located inside the placement groove 102, thereby preventing the cutting unit 201 from protruding from the first surface 1011 when not in operation.

[0056] The cutting section 201 can be a thin plate-shaped metal blade, with its first end rotatably connected to a steel wire, and its second end being a free end with a sharp cutting edge for slicing through packaging bags filled with materials. In its initial state, the entire blade is housed within the mounting slot 102. Specifically, an installation space 2021 can be created on the steel wire corresponding to the mounting slot 102, penetrating the steel wire body. The installation space 2021 can be formed by partial stamping, drilling, or segmented splicing, and its shape and size match the blade, for example, it can be a rectangular slot or a structure with a shaft hole. After the blade is embedded in the installation space 2021, it is reliably rotatably connected to the steel wire via a pin, rivet, or flexible hinge, allowing it to rotate freely around the connection point.

[0057] When the operator pulls the steel wire on the ground, the tension is transmitted along the wire to the first end of the blade, causing the blade to move axially. When the second end of the blade contacts the inclined third surface 1021 of the placement groove 102, under the blocking and guiding effect of the third surface 1021, the first end rotates outward around the rotation point, causing the second end to gradually extend out of the placement groove 102, and finally cut through the packaging bag located in the guide groove 101, releasing the internal filling material.

[0058] Because the steel wire rope transmits force directly and has minimal elastic deformation, combined with the rotating blade structure, only a small traction force is needed to efficiently complete the bag-breaking action. This makes it suitable for deep wells or formations requiring long-distance installation and less prone to failure due to tension or fatigue. Furthermore, by integrating the blades inside the steel wire rope, a highly compact layout is achieved within the limited space of the guide groove 101, avoiding the weakening of the casing structure due to the increased size of the mounting groove 102. The friction between the blades and the steel wire rope effectively limits the blades in the initial state, preventing them from moving freely due to vibration during transportation or casing installation, thus avoiding accidental tearing of the packaging bag. By setting a suitable installation space 2021 within the steel wire rope and forming a rotating connection with the blades, the reliability, safety, and ease of on-site operation of the entire cementing casing system are significantly improved.

[0059] In some embodiments, such as Figure 8 and Figure 9 As shown, the casing body 1 includes a male thread end 103 and a female thread end 104 located at opposite ends of it. The male thread end 103 is a protruding end face extending outward from the casing body 1, and the female thread end 104 is a recessed end face extending inward from the casing body 1. In the case where multiple casing bodies 1 are placed sequentially in the well, the male thread end 103 of one casing body 1 can be connected to the female thread end 104 of another casing body 1.

[0060] Each casing body 1 has a male threaded end 103 and a female threaded end 104 at both ends. The male threaded end 103 is located at one end and is an annular end face protruding outward from the casing body 1. The female threaded end 104 is located at the other end and is an annular end face recessed inward from the casing body 1. Through this convex-concave mating structure, when multiple casing bodies 1 are sequentially lowered into the wellbore, the female threaded end 104 of the subsequent casing can automatically align and tightly connect with the male threaded end 103 of the preceding casing, thereby forming a continuous casing string. After connection, multiple cementing casing devices can form a complete casing string that runs through the target well section, used to support the wellbore and for cementing.

[0061] The guide groove 101 extends axially along the casing body 1 and penetrates both end faces, with corresponding groove openings at the male thread end 103 and the female thread end 104. When adjacent casing bodies 1 are connected, the ports of their respective guide grooves 101 must be aligned to form a continuous axial channel. The steel wire in adjacent casing bodies 1 can be reliably connected through binding, magnetic attraction 3, or a pre-set mechanical connection structure. Finally, both ends of the entire steel wire are led out from the uppermost and lowermost casing sections to the surface, facilitating the operator to apply traction force at the wellhead to trigger cementing operations.

[0062] By connecting multiple cementing casing sections in series, the cementing casing can cover formation sections hundreds of meters thick, suitable for complex working conditions where shallow loose layers (such as loess and gravel layers) are thick and widely distributed. The tiny circumferential gap formed by the connection of the male threaded end 103 and the female threaded end 104, together with the guide channel 101, constitutes a crisscrossing flow guiding network. This ensures that the filling material can flow smoothly from the guide channel 101, enter the annular area between the casing and the formation through the gap between the male and female threaded ends 104, achieving natural flow, uniform filling, and full solidification, while simultaneously fixing and connecting two adjacent casing bodies 1. The final cementing casing device combines rigidity, stability, and high sealing performance, effectively preventing leakage, wellbore collapse, and groundwater contamination during drilling, providing a solid guarantee for subsequent safe drilling.

[0063] In some embodiments, such as Figure 5 As shown, the casing body 1 has multiple guide channels 101 inside its side wall, and the multiple guide channels 101 are spaced apart along the circumference of the casing body 1; wherein, the multiple guide channels 101 of the casing body 1 located in the well are connected to each other, and the two ends of the steel wire are respectively connected to magnetic suction 3, and the steel wires in the two connected guide channels 101 are connected by magnetic suction 3.

[0064] Within the sidewall of a single casing body 1, multiple guide grooves 101 (e.g., 3 to 6) are uniformly or non-uniformly arranged along the circumferential direction. Each guide groove 101 extends axially through both ends of the casing body 1. Each guide groove 101 is independent of the others and can respectively accommodate filler material, cutting blades, and steel wire, thereby forming multiple parallel cementing functional units. When multiple casing bodies 1 are sequentially lowered into the well and connected to the female threaded end 104 via the male threaded end 103, it is ensured that the guide grooves 101 of the upper and lower casings are precisely aligned circumferentially. After docking, the corresponding guide groove 101 ports are connected, forming a continuous axial channel.

[0065] Each steel wire is arranged within a guide groove 101, with magnetic attractors 3 fixed at both ends, such as permanent magnets or metal blocks with magnetic adsorption capabilities. The magnetic attractors 3 can be securely connected to the ends of the steel wires by winding, welding, or embedding, and their dimensions do not exceed the contour of the guide groove 101 end face to ensure smooth connection. When two sleeve bodies 1 are connected, the magnetic attractor 3 at the end of the guide groove 101 of the upper sleeve body 1 automatically engages with the magnetic attractor 3 at the end of the corresponding guide groove 101 of the lower sleeve body 1, physically connecting the two steel wires into one unit. The magnetic attractors 3, made of high-strength permanent magnet material (such as neodymium iron boron), have sufficient adsorption force to reliably transmit the pulling force required for triggering, and the connection is smooth, effectively reducing the risk of jamming or breakage.

[0066] During the lowering of the casing body 1, as each new casing is connected, the steel wire in its guide groove 101 automatically connects to the already lowered section via the magnetic attraction 3, eliminating the need for manual threading or locking. Once the entire casing string is in place, the operator can pull the steel wire in any guide groove 101 at the wellhead, or use multi-point synchronous traction to transmit the pulling force segment by segment through the magnetic connection points to the entire channel, thereby triggering the action of each section of the blades sequentially or simultaneously, cutting open the packaging bag and releasing the filling material. The filling material then flows into the annulus simultaneously from multiple circumferential positions, achieving a multi-point, uniform, and dense sealing effect.

[0067] A distributed cementing structure with independent but collaborative operation is constructed by multiple circumferentially distributed guide channels 101, and the use of magnetic suction components 3 enables tool-free, self-aligning, and rapid connection of steel wire, significantly simplifying the on-site assembly process. Even if individual guide channels 101 fail to trigger normally due to abnormalities, the remaining guide channels 101 can still achieve effective isolation, avoiding problems such as eccentricity, voids, or uneven isolation that are prone to occur in traditional single-sided cementing, and greatly improving the fault tolerance and reliability of the device.

[0068] In some embodiments, such as Figure 5 As shown, the sleeve body 1 also includes a pair of support parts 105 disposed in the guide groove 101. The pair of support parts 105 are respectively disposed close to the end faces of both ends of the sleeve body 1. The pair of support parts 105 are used to support the filling material; the filling material is polyurethane foam.

[0069] Inside each guide channel 101, near the two end faces of the sleeve body 1, a support portion 105 is respectively provided. The support portion 105 can be a raised step, an annular block, or an injection-molded rib, and its height is slightly lower than the inner cavity height of the guide channel 101, forming an axial limit for the filling material. The space between two support portions 105 constitutes a receiving area for the filling material, ensuring that the filling material packaging bag will not axially slip or fall off during transportation and sleeve installation.

[0070] Polyurethane foam is a product of the cross-fertilization of aerosol technology and polyurethane foam technology. It is a special polyurethane product in which polyurethane prepolymer, foaming agent, catalyst, and other components are filled into a pressurized aerosol can or packaging bag. When the material is sprayed from the aerosol can or packaging bag, the foamy polyurethane material expands rapidly and reacts with moisture in the air or the substrate it comes into contact with to form foam. The cured polyurethane foam has multiple effects such as filling gaps, bonding, sealing, heat insulation, and sound absorption. It is an environmentally friendly, energy-saving, and easy-to-use building material, suitable for sealing leaks, filling gaps, fixing and bonding, and providing thermal and sound insulation. It can also be used to bond various materials, such as metal, wood, stone, concrete, and various synthetic materials, such as polyester, polystyrene foam, PVC plastic, and rigid polyurethane foam.

[0071] By using polyurethane foam as the filling material and sealing it in a ruptureable packaging bag, the foam can rapidly foam, expand, and solidify after decompression, effectively filling irregular pores. The expanded polyurethane foam flows out along the guide channel 101 and enters the annulus between the casing and the well wall, filling leakage channels such as gravel gaps and loess pores, and finally solidifies to form an elastic seal. The solidified polyurethane material has low density and low elastic modulus, which can absorb formation deformation, prevent subsequent flow due to cracking of the rigid cement annulus, and improve long-term sealing performance. Furthermore, polyurethane foam can complete foaming and initial curing in a short time, much faster than oil well cement, significantly shortening non-productive time and improving operational efficiency.

[0072] In some embodiments, such as Figure 10 As shown, the sleeve body 1 also includes an annular sealing part 106, which is disposed on the male thread end 103. The annular sealing part 106 is connected to the inner wall surface, and the outer diameter of the annular sealing part 106 is equal to the inner diameter of the sleeve body 1.

[0073] An annular sealing portion 106 is disposed on the male thread end 103 of the sleeve body 1, and is integrally formed as an annular flange or stepped structure, continuously distributed along the circumference of the sleeve body 1. Its outer diameter is equal to the inner diameter of the sleeve body 1. When the male thread end 103 of one sleeve body 1 is connected to the female thread end 104 of another sleeve, the annular sealing portion 106 is embedded into the inner cavity of the female thread end 104. Since its outer diameter is consistent with the inner diameter of the female thread end 104, an interference fit or surface-to-surface contact seal can be formed between them. This allows the annular sealing portion 106 to tightly fit the inner wall of the female thread end 104 when the male thread end 103 is inserted into the female thread end 104 of the adjacent sleeve, forming an effective sealing interface. The annular sealing portion 106 can be integrally forged with the sleeve body 1, or it can be achieved by machining a step on the inner side of the male thread end 103 and then welding or embedding the sealing ring. During the lowering of the sleeve body 1, the annular sealing part 106 can be naturally pressed against the female thread end 104 of the other sleeve body 1 by the docking operation, without the need for additional sealing procedures. To further improve the sealing performance, a sealing groove can be opened on the surface of the annular sealing part 106, and an O-ring, metal C-ring or elastic seal can be built in.

[0074] By setting an annular sealing part 106 to cover the inner area of ​​the male thread end 103, the leakage channel between the guide groove 101 and the inside of the casing body 1 is effectively blocked, ensuring that the filling material flows into the annulus from the guide groove 101 only according to the design path, avoiding waste or cementing failure caused by the filling material leaking into the inside of the casing body 1, thereby significantly improving the sealing effect and system reliability.

[0075] In some embodiments, such as Figure 10 and Figure 14As shown, the casing body 1 is provided with a snap-fit ​​part 107, which is located near the female thread end 104 and is disposed on the outer surface of the casing body 1, for snap-fit ​​engagement with the casing hanger or slip connector. When the casing body 1 is lowered into the well, the casing hanger or slip connector can clamp the casing body 1 through the snap-fit ​​part 107, thereby achieving stable lowering.

[0076] The above operations can be flexibly adjusted according to the well depth. For example, for deeper wells, three to five casing bodies 1 can be pre-connected on the ground using casing hangers or slip connectors, while the steel wires are manually connected to form a single column. This column is then lowered to the bottom of the well using a crane. The next column is then lowered to the bottom and connected to the previous column underground, with the steel wires automatically connected via magnetic attachments 3. This segmented pre-assembly method effectively avoids excessively high requirements on reinforced concrete structures and the strength of the steel bars themselves due to excessive well depth and casing length and weight, making the use of ordinary steel possible and reducing material costs. It also takes into account the limitations of the crane boom length on site, ensuring smooth lifting operations. For shallower wells, the casing bodies 1 can be lowered one by one using a crane, with the connection completed inside the well. The snap-fit ​​structure and magnetic attachments 3 enable rapid connection of the steel wires, simplifying the configuration of ground equipment and improving operational convenience.

[0077] In some embodiments, such as Figures 11 to 13 As shown, the annular sealing portion 106 of the sleeve body 1 has multiple claw structures 108 circumferentially arranged on the side opposite to the male thread end 103, for example, four claw structures 108 are circumferentially spaced. The inner surface of the female thread end 104 has a circumferential annular groove structure 109 corresponding to the claw structures 108. The claw structures 108 can be multiple wedge-shaped claws arranged axially along the sleeve body 1 on the annular sealing portion 106, and the corresponding groove structures 109 are multiple wedge-shaped grooves arranged axially. The claw structures 108 and the male thread end 103 have a first mating area 110, and the groove structures 109 and the female thread end 104 have a second mating area 111. When the male thread end 103 and the female thread end 104 are mated, an annular sealing ring can be provided between the first mating area 110 and the second mating area 111 to enhance the sealing effect.

[0078] like Figure 14As shown, when the female threaded end 104 of one sleeve body 1 aligns with the male threaded end 103 of the previous sleeve body 1, the claw structure 108 of the male threaded end 103 extends into the female threaded end 104 of the latter. During this process, multiple claw structures 108 undergo elastic deformation under gravity and compression, reducing their circumference. When the claw structure 108 moves to the position of the slot structure 109 inside the female threaded end 104, it elastically returns to its original shape and automatically embeds itself into the corresponding slot. The height of the claw and the slot can be the same to achieve a tight engagement, thereby completing the automatic connection of the two sleeve bodies 1. At the same time, the annular sealing ring between the first mating area 110 and the second mating area 111 achieves a reliable internal seal, preventing filling material from entering the sleeve body 1 from the mating area between the two sleeve bodies 1. The entire connection process requires no welding, achieving both a strong connection and a good seal simultaneously.

[0079] In some embodiments, the sleeve body 1 includes a main body and a cover. The main body is formed by casting a support frame and cement, and the formed main body has a pre-set groove structure. The cover is connected to the main body at the position where the groove structure is to form a guide channel 101.

[0080] The support frame is made of high-strength metal materials, such as carbon steel, alloy steel, or corrosion-resistant stainless steel, and is constructed into a cage-like or mesh-like skeleton to serve as the load-bearing core of the main body, ensuring overall compressive, tensile, and extrusion resistance. Cement, such as Grade G cement, micro-expansion cement, or fiber-reinforced cement, is poured into the exterior and interior spaces of the support frame to form a rigid composite structure. During the pouring process, a semi-open groove extending axially can be pre-reserved in the mold. This groove is located inside the sidewall of the casing and penetrates both end faces of the casing body; its cross-section can be U-shaped, trapezoidal, or rectangular.

[0081] The cover can be a strip-shaped component that matches the shape of the groove, and can be made of metal plate, reinforced concrete component, or fiber-reinforced composite material. The cover can be tightly covered at the groove opening of the main body by means of mechanical connection (such as screws, steel plate insertion), adhesive sealing (such as epoxy glue, polyurethane glue sealant), or concrete pouring connection. Among them, the placement groove 102 can be directly processed on the support frame or integrally formed during cement pouring. After the cover is installed, the cover and the groove together form a closed, continuous, through-flow channel 101, which can be used to accommodate filling materials, packaging bags, cutting parts 2, and steel wire pull wires, etc., and plays a role in protecting and limiting the internal components, while preventing fluid from entering the well.

[0082] By dividing the sleeve body 1 into two parts, the polyurethane foam packaging bag, blade-type cutting part 201, steel wire pull line and support part 105 can be pre-installed into the groove before the guide groove 101 is closed, which facilitates assembly and simplifies processing.

[0083] The method for manufacturing and using cementing casing devices provided in this application includes:

[0084] First, a support frame (such as a reinforcing cage or mesh skeleton) is fabricated. The support frame is positioned in a mold, and a grooved core mold is placed at a pre-reserved groove position on its side wall. Then, cement slurry is poured, cured, and demolded to form a cement and metal composite body with a pre-reserved groove structure. The male end 103, female end 104, and annular sealing part 106 are then processed. The filling material is sealed in a packaging bag, which is placed in the guide channel 101, and a support part 105 is provided on both sides or one end to fix the axial position. The blade-type cutting part 201 is installed in the placement groove 102, and a steel wire is passed through the guide channel 101. An installation space 2021 is opened on the steel wire at the corresponding position, and the blade is placed in the installation space 2021 and rotatedly connected with the steel wire. The two ends of the steel wire extend along the guide channel 101, and magnetic suction parts 3 are installed at the ends for automatic connection when multiple sections of the sleeve body 1 are connected. The prefabricated cover is placed over the groove opening of the main body to make the cover and the main body tightly connected, forming a closed guide channel 101. The joint is then sealed to prevent downhole fluid from seeping in.

[0085] Multiple pre-fabricated cementing casing units are transported to the site, and the first cementing casing unit is hoisted to the wellhead. Connecting the top drive or lifting clamp, it is slowly lowered into the well to the preset depth. The second casing body 1 is hoisted, its female threaded end 104 aligned with the male threaded end 103 of the already lowered casing body 1, ensuring the circumferential alignment of the guide grooves 101. After placement, the male and female threaded ends 104 of the casing body 1 are sealed together, the two guide groove sections 101 are precisely connected, and the magnetic suction devices 3 on the steel wires at both ends automatically attract and connect, forming a continuous traction channel. This process is repeated until the entire target section is covered by the cementing casing unit.

[0086] After the cementing casing is lowered to the designed depth, it is mounted on the wellhead or hanger. Ensure that both ends of the wire rope extend from the uppermost casing's guide channel 101 to the surface for easy operation. Operators on the ground pull the wire rope or use a winch for synchronous traction. The tension is transmitted via magnetic connection points to the blades within each guide channel 101. The blades rotate around a pivot point, puncturing the packaging bag. The filling material decompresses, rapidly foams, expands, and solidifies, flowing out of the guide channel 101 and filling the annulus. After solidification, a dense, elastic seal is formed, completing the isolation of loose strata such as gravel and loess layers.

[0087] Example 2

[0088] This application provides a drilling system, including the cementing casing device of embodiment 1.

[0089] The drilling system may also include a drilling rig and drill string assembly for drilling to the target depth to form a wellbore. Then, using the cementing casing assembly of Example 1, prefabricated multiple sections of cementing casing are sequentially connected and lowered into the well. On the surface, the operator pulls the traction unit 202, which drives the cutting unit 201 to cut open the packaging bag, releasing the filler material. The filler material expands and solidifies, forming a dense, elastic seal in the annulus between the cementing casing assembly and the wellbore. After cementing is completed, drilling into the lower formation can continue, or the process can directly proceed to the well completion production stage.

[0090] This application provides a drilling system that includes the cementing casing device of Embodiment 1. This enables the drilling system to form a highly efficient, environmentally friendly, and integrated solution for loose, easily leaking, and easily collapsible formations (such as surface gravel layers and loess layers).

[0091] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cementing casing device, characterized in that, The device comprises: a casing body for being placed in a well; at least one flow guide groove is arranged in the side wall of the casing body, the flow guide groove extends along the length direction of the casing body and penetrates the end face of both ends of the casing body; a filling material is wrapped in a packaging bag and arranged in the flow guide groove; a cutting member is arranged in the flow guide groove, the cutting member comprises a cutting part and a pulling part connected with each other, the cutting part is located at one side of the filling material, and the pulling part is arranged along the flow guide groove and extends to the outside of the casing body; wherein the pulling part located outside the casing body can control the cutting member to stretch out to the side of the filling material, so that the cutting member can cut the packaging bag.

2. The device according to claim 1, wherein the flow guide groove comprises opposite first and second faces, and the first face is close to the inner wall surface of the casing body; the casing body located at the first face is further provided with at least one arrangement groove extending towards the inner wall surface, the arrangement groove is communicated with the flow guide groove, and the cutting part is arranged in the arrangement groove.

3. The device according to claim 2, wherein the arrangement groove comprises a third face connected with the first face, the size of the slot of the arrangement groove gradually decreases along the direction from the first face to the inner wall surface, so that the third face is formed as an inclined face with an included angle with the first face; the cutting part comprises a first end and a second end oppositely arranged along the direction parallel to the first face, the first end is rotationally connected with the pulling part, and the second end is close to and oppositely arranged with the third face.

4. The device according to claim 3, wherein the pulling part is a steel wire pull line, both ends of the steel wire pull line extend to both ends of the casing body respectively, and the wire shape of the steel wire pull line located in the arrangement groove is matched with the shape of the arrangement groove; the cutting part is a blade, the steel wire pull line is provided with an installation space penetrating itself, the installation space is matched with the size of the blade, the blade is arranged in the installation space and rotationally connected with the steel wire pull line.

5. The device according to claim 4, wherein the casing body is provided with a pin end and a box end oppositely located at both ends thereof, the pin end is a convex end face extending to the outside of the casing body, and the box end is a concave end face extending to the inside of the casing body; wherein in the state that a plurality of casing bodies are sequentially placed in the well, the pin end of one casing body can be butted with the box end of another casing body.

6. The device according to claim 5, wherein a plurality of flow guide grooves are arranged in the side wall of the casing body, and the plurality of flow guide grooves are arranged at intervals along the circumferential direction of the casing body; wherein the flow guide grooves of the plurality of casing bodies located in the well are butted with each other, both ends of the steel wire pull line are connected with magnetic attraction members respectively, and the steel wire pull lines in the two butted flow guide grooves are connected through the magnetic attraction members.

7. The well cementing casing device of claim 1, wherein: the casing body further comprises a pair of supporting portions disposed in the flow guide groove, the pair of supporting portions are respectively disposed near the end faces of the two ends of the casing body, and the pair of supporting portions are used for supporting the filling material; the filling material is polyurethane foam.

8. The well cementing casing device of claim 5, wherein: the casing body further comprises an annular sealing portion disposed at the pin end, the annular sealing portion is connected with the inner wall surface, and the outer diameter size of the annular sealing portion is equal to the inner diameter size of the casing body.

9. The well cementing casing device of claim 1, wherein: the casing body comprises a main body and a cover body, the main body is formed by a supporting frame and cement casting, and the formed main body is pre-provided with a groove structure, and the cover body is connected with the main body at the position provided with the groove structure to form the flow guide groove.

10. A drilling system characterized by, The well cementing casing device according to any one of claims 1-9.

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