Packing type graded cementing device

A graded cement injection and isolation technology, which is used in sealing/packing, wellbore/well components, earth-moving drilling, etc. The effect of reducing the difficulty of operation and improving the carrying capacity

CN112443289AActive Publication Date: 2021-03-05CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-03-05

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Abstract

The invention provides a packing type graded cementing device. One end of a body is connected with a packer base pipe, and a circulating hole is formed in the body. The body sleeves a closing sleeve and an opening sleeve, the closing sleeve is located at the end, away from the packer base pipe, of the body, and the opening sleeve is located between the closing sleeve and an expansion sealing base.A part capable of being matched with a closing plug is arranged in the closing sleeve, and a part capable of being matched with an opening plug is arranged in the opening sleeve. A rubber sleeve is arranged on the packer base pipe, a sealed cavity can be formed between the rubber sleeve and the packer base pipe, and a liquid injection channel is formed between the packer base pipe and the sealedcavity. A closing valve is arranged on the liquid injection channel. The expansion sealing base is located at an inlet of the liquid injection channel in the packer base pipe. A part matched with theopening plug is arranged in the expansion sealing base, and the expansion sealing base can move in the axial direction. The opening sleeve can move in the axial direction, and the closing sleeve can move in the axial direction to close the circulating hole. Annular well hole packing can be achieved, the structure is simple, operation is easy, and safety and reliability are achieved.
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Description

technical field

[0001] The invention relates to the technical field of downhole cementing equipment for petroleum and natural gas, in particular to a pack-off type graded cementing device. Background technique

[0002] After oil and gas wells are drilled, casings need to be lowered for cementing operations. The two-stage cementing technology can solve some technical problems in the cementing construction of deep and ultra-deep wells, such as large amount of cement injection at one time and long construction time. The fracture pressure of the formation is low, and the cement cannot return to the designed well depth and other problems. The graded water injector with annulus isolation function can realize the isolation of the upper and lower annular open holes of the graded cementing device after the first-stage cementing is completed, blocking the transmission of liquid column pressure, which can directly reduce the pressure on the formation at the bottom of the well, Protect...

Examples

Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0043] figure 1 Schematically shows the initial state of the isolated staged cementing device 10 of the embodiment of the present invention. figure 2 It schematically shows the state in which the plug opening of the sealed staged cementing device 10 of the embodiment of the present invention reaches the position of the swelling seal base. image 3 It schematically shows the open state of the liquid injection channel of the isolated staged cementing device 10 of the embodiment of the present invention. Figure 4Schematically shows the swelling state of the pack-off staged cementing device 10 of the embodiment of the present invention. Figure 5 It schematically shows the sealing state of the sealing-type staged cementing device 10 of the embodiment of the pres...