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Open hole well plugging pipe column

A technology for open hole and plugging pipes, applied in wellbore/well components, drill pipe, casing, etc., can solve problems such as complex wellbore, damage to upper oil layer, well kick, etc., to avoid construction risks and reliable anchoring and suspension , the effect of large diameter change range

Pending Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are the following defects in drilling suspended cement plugs: (1) The cement plugging process is complex and the cycle is long; (2) Some wells have lost circulation and well kick, and the risk of cement plugging is high; (3) The cement plugging is easy to cause wellbore Complicated; (4) The cement plugging process causes damage to the upper oil layer

Method used

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  • Open hole well plugging pipe column
  • Open hole well plugging pipe column
  • Open hole well plugging pipe column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , figure 2 and image 3 . An open-hole well plugging pipe string includes a delivery pipe string 1, a separation device 2, a suspension support device 3, a plugging device 4, a check valve 5 and an open-hole wellbore 6. The delivery pipe string 1, separation device 2, suspension support device 3, occluder 4 and check valve 5 are connected in sequence and lowered into the open hole wellbore 6.

[0027]The occluder includes a sealing inner tube 4-1, a constant pressure shear nail 4-2, a one-way opening lock ring 4-3, an upper sealing ring 4-4, a lower sealing ring 4-5, a sealing outer tube 4-6, Upper cone 4-7, rubber cartridge 4-8, inner pipe 4-9, lower cone 4-10 and connection sleeve 4-11. The outside of the sealed inner tube 4-1 is provided with an outer variable diameter shoulder surface 4-1-2, the outer diameter above the outer variable diameter shoulder surface 4-1-2 is larger than the lower outer diameter, and the sealed inner tube 4-1 1 is provid...

Embodiment 2

[0029] see figure 1 , figure 2 , image 3 and Figure 4 . An open-hole well plugging pipe string includes a delivery pipe string 1, a separation device 2, a suspension support device 3, a plugging device 4, a check valve 5 and an open-hole wellbore 6. The delivery pipe string 1, separation device 2, suspension support device 3, occluder 4 and check valve 5 are connected in sequence and lowered into the open hole wellbore 6.

[0030] The occluder includes a sealing inner tube 4-1, a constant pressure shear nail 4-2, a one-way opening lock ring 4-3, an upper sealing ring 4-4, a lower sealing ring 4-5, a sealing outer tube 4-6, Upper cone 4-7, rubber cartridge 4-8, inner pipe 4-9, lower cone 4-10 and connection sleeve 4-11. The outside of the sealed inner tube 4-1 is provided with an outer variable diameter shoulder surface 4-1-2, the outer diameter above the outer variable diameter shoulder surface 4-1-2 is larger than the lower outer diameter, and the sealed inner tube 4-...

Embodiment 3

[0033] see figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 . An open-hole well plugging pipe string includes a delivery pipe string 1, a separation device 2, a suspension support device 3, a plugging device 4, a check valve 5 and an open-hole wellbore 6. The delivery pipe string 1, separation device 2, suspension support device 3, occluder 4 and check valve 5 are connected in sequence and lowered into the open hole wellbore 6.

[0034] The occluder includes a sealing inner tube 4-1, a constant pressure shear nail 4-2, a one-way opening lock ring 4-3, an upper sealing ring 4-4, a lower sealing ring 4-5, a sealing outer tube 4-6, Upper cone 4-7, rubber cartridge 4-8, inner pipe 4-9, lower cone 4-10 and connection sleeve 4-11. The outside of the sealed inner tube 4-1 is provided with an outer variable diameter shoulder surface 4-1-2, the outer diameter above the outer variable diameter shoulder surface 4-1-2 is larger than the lower outer diameter, and the sealed ...

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Abstract

The invention discloses an open hole well plugging pipe column. The open hole well plugging pipe column comprises a conveying pipe column, a separating device, a hanging supporting device, a plugging device, a check valve and an open hole shaft, wherein the conveying pipe column, the separating device, the hanging supporting device, the plugging device and the check valve are sequentially connected and then are put into the open hole shaft. Meanwhile, the invention provides a plugging method of the open hole well plugging pipe column, firstly, conventional well flushing is conducted, and drilling fluid is pumped in from the conveying pipe column; then, a ball is thrown for pressing, and 7-9 MPa of pressure is applied into the conveying pipe column to anchor the suspension supporting device; pressing is carried out for 12-14 MPa into the conveying pipe column to enable the plugging device to seal the open hole shaft; and the pressure is applied to the inside of the conveying pipe column by 18-19 MPa so that the conveying pipe column is separated into two bodies by the separation device. The open hole well plugging pipe column is advantaged in that the technology is simple, convenient and fast, construction risks, shaft complexity and oil layer damage caused by impending of the cement plug are fundamentally avoided, and operations such as layer sealing and isolation can be safely and efficiently carried out in the open hole shaft where the lower invalid well section or the leakage layer needs to be plugged.

Description

technical field [0001] The invention relates to the field of oil production and well completion equipment, in particular to an open hole plugging string. Background technique [0002] When the oil well has been drilled, it is necessary to seal the lower invalid well section or leaky layer. In order to reduce the cementing and sealing of the well section or prevent the lost circulation, the bottom of the well needs to be permanently sealed. This operation is called sealing and isolation in the oil field. Since this section of the wellbore has not been casingd, it is called sealing, isolation and other operations in the open hole wellbore. At present, when performing operations such as sealing and isolation in the open-hole wellbore, the method of sealing and isolating the bottom of the well is mostly used to seal and isolate the bottom of the well by drilling a suspended cement plug. For example: the patent (application number 201611075931.3, publication number CN106639969A)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B23/01E21B23/10E21B17/02E21B33/122
CPCE21B33/13E21B23/01E21B23/10E21B17/021E21B33/1208E21B33/122
Inventor 田启忠戴荣东肖建洪杨启贞王锴陈丽媛周广清侯业贵于少卿刘希峰
Owner CHINA PETROLEUM & CHEM CORP
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