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Fixed-point isolation layered extrusion sealing tool and use method thereof

A tool and integrated technology, applied in the directions of sealing/isolation, earth-moving drilling, drilling pipe, etc., can solve the problems such as the inability to salvage the blocking agent, the risk of the flagpole operation, and the cumbersome process, so as to solve the complex drilling process, Solve the effect of long drilling time and ensure wellbore safety

Pending Publication Date: 2020-02-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is cumbersome, the construction risk is high, there is a danger that the insertion head cannot be inserted after setting, and there is a danger that the plugging agent will be buried and the extrusion sealing tool cannot be salvaged
[0005] The packer extrusion operation is not suitable for wells with overflow that need to be under pressure because the packer cannot be tripped. At the same time, the plugging agent may cause the packer to weld to the bottom of the well, and the construction risk is high
[0006] The above-mentioned extrusion sealing tools control the fluid communication by sealing the upper and lower layers of the casing at fixed points in the casing, but the construction process of the inserted tubular bridge plug is relatively complicated, and it is necessary to connect the bridge plug through the feeding tool and send it to the designated place for sealing After that, insert the insertion tool to squeeze and seal, and finally use the fishing tool to salvage the plugging tool. After squeezing and sealing, there is a construction risk that the plugging agent left on the upper part cannot be salvaged.
The cement flow receiver is brought into the bridge plug with the insertion head, and the seat seal is squeezed into one body, but it cannot be salvaged. Since the body material is made of relatively hard cast iron, drilling and grinding is difficult when the well depth is insufficient. According to the field construction experience, the drilling and grinding time longer
When the packer is squeezed and sealed, there is a risk that the plugging agent will block the packer and cause the flagpole to be inserted

Method used

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  • Fixed-point isolation layered extrusion sealing tool and use method thereof
  • Fixed-point isolation layered extrusion sealing tool and use method thereof
  • Fixed-point isolation layered extrusion sealing tool and use method thereof

Examples

Experimental program
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Effect test

no. 1 approach

[0036] The first embodiment of the present invention relates to a fixed-point sealing layer extrusion sealing tool, such as figure 1 As shown, it includes a fixed-point seat sealing mechanism 1 and an integrated mechanism 2 for feeding, seating and squeezing, such as figure 2 As shown, the fixed-point seat sealing mechanism 1 includes a hollow central tube 6, and an upper slip 3, an upper vertebral body 4, an expansion rubber tube 5, and a lower vertebral body that are sleeved outside the central tube 6 from top to bottom. 7 and lower slips 8; the upper end of the center pipe 6 is connected with a hands-off joint 12, the inside of the center pipe 6 is provided with a circulating sliding sleeve 9, and the lower end of the center pipe 6 is connected with a guide shoe 10; The integrated mechanism 2 is inserted into the central tube 6 and is detachably connected to the hands-off joint 12 .

[0037] The method of using the fixed-point sealing layered extrusion sealing tool accord...

no. 2 approach

[0040] This embodiment provides a fixed-point sealing layer extrusion sealing tool, such as figure 1 As shown, it includes a fixed-point seat sealing mechanism 1 and an integrated mechanism 2 for feeding, seating and squeezing, such as figure 2 As shown, the fixed-point seat sealing mechanism 1 includes a hollow central tube 6, and an upper slip 3, an upper vertebral body 4, an expansion rubber tube 5, and a lower vertebral body that are sleeved outside the central tube 6 from top to bottom. 7 and lower slips 8; the upper end of the center pipe 6 is connected with a hands-off joint 12, the inside of the center pipe 6 is provided with a circulating sliding sleeve 9, and the lower end of the center pipe 6 is connected with a guide shoe 10; as image 3 As shown, the integrated mechanism 2 for sending, sitting, and squeezing at least includes a centralizer 13 and an insertion tube 14, the centralizer 13 is riveted to the upper end of the insertion tube 14, and the lower end of th...

no. 3 approach

[0047] Such as figure 2 As shown, preferably, the upper end of the central pipe 6 is provided with a first pin hole 16, and a first pin is installed in the first pin hole 16 to fix the lower end of the hands-free joint 12 on the central pipe 6. On the top, the upper end of the hands-off joint 12 is sent into the reverse screw sleeve 15 of the sitting and squeezing integrated mechanism 2 through a threaded connection; the inner inner thread of the middle section of the central tube 6 is connected to the circulating sliding sleeve 9, and the lower end of the central tube 6 is connected to the outer thread. Boots 10.

[0048] Preferably, a first tapered surface is provided on the outer peripheral surface of the upper cone, and a second tapered surface with the same inclination angle matched with the first tapered surface is provided on the inner peripheral surface of the lower end of the upper slip 3, and the second tapered surface The outer circumference of the surface is prov...

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PUM

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Abstract

The invention provides a fixed-point isolation layered extrusion sealing tool and a use method thereof. After a lower layer is subjected to extrusion sealing by the fixed-point isolation layered extrusion sealing tool, the extrusion sealing section of the lower layer is sealed, an upper layer is subjected to continuous extrusion sealing, and thus, the problem of multilayered system extrusion sealing is solved effectively. The fixed-point isolation layered extrusion sealing tool can perform feeding, setting and extrusion sealing construction at a time; no special feeding tools and special extrusion sealing tools are needed for multi-pass pipe column construction; and the problem of the complicated multi-pass drilling process of the extrusion sealing tool is solved. The fixed-point isolationlayered extrusion sealing tool uses macromolecule and aluminum-magnesium alloy easy-to-drill material. In the later drilling process, the drilling speed of the fixed-point isolation layered extrusionsealing tool is faster than that of similar steel tools, and thus, the problem of the long abrasive drilling time of the extrusion sealing tool is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and relates to a technical measure for sealing a plurality of layers in a casing after well completion, in particular to a fixed-point segmented extrusion tool and a use method thereof. Background technique [0002] The extrusion sealing tool is a tool used in the casing plugging process in the oil drilling industry. It is installed inside the casing and used to isolate the upper and lower layers of the casing and selectively squeeze and seal. [0003] Commonly used fixed-point extrusion sealing tools include cement flow receivers, inserted tubular bridge plugs, packers, etc. Among them, the cement retainer is used for the construction of cementing operations with extrusion in casings in stages, which can effectively separate two layers of extrusion. Cement injection operation, when the lower layer of the cement retainer is congealed or under pressure, squeeze the above cement retainer...

Claims

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Application Information

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IPC IPC(8): E21B33/126E21B33/128E21B23/06E21B17/10
CPCE21B33/1265E21B33/1285E21B23/06E21B17/1078
Inventor 高果成陈鹏伟刘志雄王文斌万向臣陈宁沈明华曹佳邹鸿江贺华镭万向辉安全成赵文庄黄超曲玉龙
Owner BC P INC CHINA NAT PETROLEUM CORP