Combined casing pipe capable of resisting fault slippage shear failure

Abstract

The utility model discloses a combined casing pipe for resisting fault slippage shear failure, which is characterized by comprising an inner casing pipe and an outer casing pipe which are sleeved inside and outside, two ends of the inner casing pipe and the outer casing pipe are respectively connected with an upper joint and a lower joint, a gap is arranged between the inner casing pipe and the outer casing pipe, and foamed aluminum is filled in the gap. Through combined energy absorption of the inner sleeve, the outer sleeve and the foamed aluminum, the external extrusion resistance and the shear resistance of the sleeve are greatly improved, the risk of deformation of the sleeve on site is reduced, and efficient production of oil gas is assisted.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas cementing, in particular to a combined casing capable of resisting fault slip shear damage. Background Art

[0002] With the deepening of oil and gas exploration and development, casing deformation has seriously impacted the efficient extraction of shale gas. In the Baima block of Fuling, over 80% of casing deformation occurs during hydraulic fracturing, hindering subsequent fracturing operations and causing significant economic losses to the oilfield. Microseismic monitoring technology has revealed that the mechanism of casing deformation is that during hydraulic fracturing, natural fractures and faults are activated by the fracturing fluid, leading to fault slip and shear damage to the casing. Conventional thick-walled, high-grade steel casing does not have sufficient load-bearing capacity.

[0003] Therefore, a casing device that can resist fault slip shear failure needs to be studied. Utility Model Content

[0004] In order to solve the above-mentioned engineering problems, the utility model provides a combined casing that can resist fault slip and shear damage. By combining energy absorption, the casing's anti-external squeeze and anti-shear capabilities are greatly improved, the risk of on-site casing deformation is reduced, and efficient oil and gas production is promoted.

[0005] This application is implemented as follows:

[0006] The present application provides a combined casing that resists fault slip shear damage, characterized in that it comprises an inner casing and an outer casing that are connected inner and outer, the two ends of the inner casing and the outer casing are respectively connected to an upper joint and a lower joint, a gap is provided between the inner casing and the outer casing, and the gap is filled with foam aluminum.

[0007] According to the above technical solution, the inner and outer casings are fixed by the double-layer buckle structure of the upper joint and the lower joint.

[0008] According to the above technical solution, the end structures of the upper joint and the lower joint connected to the inner and outer sleeves are similar, with a certain length of protrusion for abutting against the foam aluminum in the middle, and a connecting part for connecting to the inner sleeve on the inside. The connecting part is provided with a shoulder and a groove on the outside for plugging into the outer sleeve, wherein the protrusion and the groove constitute a double-layer snap-on structure.

[0009] According to the above technical solution, the thickness of the foam aluminum is 15.00-15.50 mm, and the height is 2450 mm-2550 mm.

[0010] According to the above technical solution, the two ends of the outer sleeve are fitted with the upper joint and the lower joint in a clearance fit, which is fixed by glue filling or welding.

[0011] According to the above technical solution, the two ends of the inner sleeve are respectively threadedly connected to the upper joint and the lower joint.

[0012] According to the above technical solution, the upper end of the upper joint is provided with an external thread for threaded connection with the lower joint of the previous casing, and the lower end of the lower joint is provided with an internal thread for threaded connection with the upper joint of the next casing.

[0013] According to the above technical solution, the outer diameter of the upper joint is 141.20~141.40mm, the inner diameter is 104.70~104.90mm, the thickness of the inner buckle in the double-layer buckle structure is 15.00~15.50mm, and the thickness of the outer buckle is 5.00~5.50mm.

[0014] The beneficial effects of this application are:

[0015] The utility model absorbs energy through the combination of inner and outer casings and foam aluminum, thereby greatly improving the casing's anti-external extrusion and anti-shear capabilities, reducing the risk of on-site casing deformation, and facilitating efficient oil and gas production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the combined casing after cementing at the fault fracture slip site.

[0019] In the figure, 1-casing male buckle; 2-outer casing; 3-inner casing; 4-foam aluminum; 5-casing female buckle; 6-fault fracture surface; 7-cementing cement; 8-formation. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0025] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] The features and performance of the maintenance device and method for the load-bearing components of the suspended open track beam of the present application are further described in detail below in conjunction with the embodiments.

[0028] like Figure 1 As shown, an embodiment of the present application provides a combined casing that resists fault slip shear damage, including an inner casing 3 and an outer casing 2 that are connected inner and outer, the two ends of the inner casing 3 and the outer casing 2 are respectively connected to an upper joint 1 and a lower joint 5, and a gap is provided between the inner casing and the outer casing, and the gap is filled with foam aluminum 4.

[0029] In this embodiment, the upper connector 1 and the lower connector 5 are devices that connect the inner and outer sleeves. The inner and outer sleeves are fixed by the double-layer snap-fit ​​structure of the upper connector 1 and the lower connector 5. The upper connector 1 has an outer diameter of 141.20-141.40 mm and an inner diameter of 104.70-104.90 mm. The double-layer snap-fit ​​design can enhance the strength of the connection. The inner snap-fit ​​is 15.00-15.50 mm thick. By thickening the snap-fit, the connection strength with the inner sleeve is enhanced to prevent failure of the inner sleeve-snap-fit ​​connection. The outer snap-fit ​​is 5.00-5.50 mm thick and mainly functions to limit the outer sleeve. The upper connector 1 and the lower connector 5 have internal threads at the connection with the inner sleeve 3. Specifically, the end structures of the upper joint 1 and the lower joint 5 connected to the inner and outer sleeves are similar, with a protrusion 101 of a certain length for abutting the foam aluminum 4 in the middle, and a connecting part 102 for connecting to the inner sleeve provided on the inner side, the connecting part is provided with a shoulder 103, and a groove 104 is provided on the outside for plugging into the outer sleeve, wherein the protrusion 101 and the groove 104 constitute a double-layer snap-fit ​​structure.

[0030] The outer casing 2 is made of P110 steel with an outer diameter of 177.8 mm and a wall thickness of 10.36 mm, while the inner casing 3 is made of P110 steel with an outer diameter of 127 mm and a wall thickness of 11.1 mm. The aluminum foam 4 filling the gap between the outer and inner casings is 15.04 mm thick and 2500 mm high.

[0031] The outer sleeve 2 is fitted with the upper joint 1 and the lower joint 5 in a clearance fit. During installation, the inner surface is coated with waterproof glue to fill the gap. The outer surface of the outer sleeve 2 is connected with the upper joint 1 and the lower joint 5 by welding.

[0032] Both ends of the inner sleeve 3 are threadedly connected to the upper joint and the lower joint respectively.

[0033] The upper end of the upper joint 1 is provided with an external thread for threaded connection with the lower joint of the previous casing, and the lower end of the lower joint is provided with an internal thread for threaded connection with the upper joint of the next casing.

[0034] like Figure 2 As shown, after the combined casing is assembled, it is lowered into the location of the fault fracture surface 6, and the casing is cemented to form a cement ring 7 on the outer wall to complete the cementing operation.

[0035] like Figure 2 As shown, when the fault fracture surface 6 slips, the stratum 8 exerts a shearing effect on the combined casing. As the outer casing 2 begins to deform, the internal aluminum foam 4 begins to deform and absorb energy, reducing the squeezing effect of the stratum shear on the inner casing 3. Shear deformation of the inner casing only occurs when both the outer casing 2 and the aluminum foam 4 are damaged and unable to offset the slipping shear of the stratum 8. Thus, the cushioning and protective effects of the cement sheath 7, outer casing 2, and aluminum foam 4 effectively improve the combined casing's anti-squeeze capability, reduce deformation of the inner casing 3, and provide a safe space for running downhole tools.

[0036] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A combined casing for resisting fault slip shear failure, characterized by: The utility model comprises an inner sleeve and an outer sleeve which are connected to each other. The two ends of the inner sleeve and the outer sleeve are respectively connected to an upper joint and a lower joint. A gap is provided between the inner sleeve and the outer sleeve, and the gap is filled with foam aluminum.

2. The combined casing for resisting fault slip shear failure according to claim 1, characterized in that: The inner and outer casings are fixed by a double-layer snap-fit ​​structure of an upper joint and a lower joint.

3. The combined casing for resisting fault slip shear failure according to claim 2, characterized in that: The end structures of the upper joint and the lower joint connected to the inner and outer sleeves are similar, with a certain length of protrusion for abutting against the foam aluminum in the middle, and a connecting part for connecting to the inner sleeve on the inner side. The connecting part is provided with a shoulder and a groove on the outside for inserting the outer sleeve, wherein the protrusion and the groove constitute a double-layer snap-on structure.

4. The combined casing for resisting fault slip shear failure according to claim 1 or 2, characterized in that: The thickness of the foam aluminum is 15.00-15.50 mm, and the height is 2450 mm-2550 mm.

5. The combined casing for resisting fault slip shear damage according to claim 3, characterized in that: The fitting mode between the two ends of the outer sleeve and the upper joint and the lower joint is a clearance fit, which is fixed by glue filling or welding.

6. The combined casing for resisting fault slip shear failure according to claim 1 or 2, characterized in that: The two ends of the inner sleeve are respectively threadedly connected to the upper joint and the lower joint.

7. The combined casing for resisting fault slip shear failure according to claim 1 or 2, characterized in that: The upper end of the upper joint is provided with an external thread for threaded connection with the lower joint of the previous casing, and the lower end of the lower joint is provided with an internal thread for threaded connection with the upper joint of the next casing.

8. The combined casing for resisting fault slip shear failure according to claim 3, characterized in that: The outer diameter of the upper joint is 141.20~141.40mm, the inner diameter is 104.70~104.90mm, the thickness of the inner buckle in the double-layer buckle structure is 15.00~15.50mm, and the thickness of the outer buckle is 5.00~5.50mm.

Images