Novel blowout-prevention and anchoring integrated tool

Abstract

The invention relates to a novel blowout-prevention and anchoring integrated tool. The tool comprises an anti-rotation part, a releasing part, a pressure relief channel part, an anchoring part, a gravity valve part and a through rod, wherein the anchoring part comprises a supporting slip; an upper joint of an anti-rotation anchor is connected with the lower end of a screw pump; a lower joint of the anti-rotation anchor is connected with a sieve pipe; the lower end of the sieve pipe is connected with a connecting joint of a releasing packer; the lower end of a connecting rod is connected with the through rod; an upper joint of a pressure relief channel is connected with a lower joint of the releasing packer; an upper joint of the supporting slip is connected with a lower joint of the pressure relief channel; an upper joint of a gravity valve is connected with a central pipe of the supporting slip; and a lower joint of the gravity valve is connected with an oil pipe through threads. According to the novel blowout-prevention and anchoring integrated tool, the anti-rotation effect is more ideal, the failure caused by insufficient engagement force after the long-term use of the releasing packer is prevented, the danger of upward channeling of a tubular column during operation can be avoided through the pressure relief channel part, and the failure of a float switch caused by sand sinking accumulation of a fractured well can be avoided.

Description

Technical field [0001] The invention relates to the field of screw pumps and oil well pumps, in particular to a new integrated tool for blowout prevention and anchoring. Background technique [0002] At present, the water blocking pipe string and the production pipe string need to be lifted and lowered twice in a row, which not only increases the operation time but also increases the construction cost. Although the existing integrated blowout prevention and anchoring tool can achieve one trip of the pipe string, the anti-rotation effect of the flap anchor is not ideal in actual use. When the old throwaway packer is released, the slips are anchored first It is easy to cause incomplete sealing of the rubber cylinder and the structure of the float switch cannot pass the test instrument. [0003] The main problems include the following aspects: (1) In the anti-reversal use of screw pump wells, the flap anchor often fails due to the fracture of the plate spring and the tool failure; (2...

AI Technical Summary

Problems solved by technology

[0002] At present, the water plugging pipe string and the production pipe string need to be lifted and lowered twice in a row, which not only increases the operation time but also increases the construction cost

However, although the existing blowout prevention and anchoring integrated tools can realize the downhole trip of the pipe string, the anti-rotation effect of the flap anchor in actual use is not ideal. When the old-fashioned drop-off packer is released, the slips anchor first It is easy to cause incomplete sealing of the rubber cartridge, and the structure of the float switch cannot pass the test instrument and other problems.

[0003] The main problems include the following aspects: (1) When the flap anchor is used in the anti-reverse use of the screw pump well, the failure of the tool is often caused by the breakage of the leaf spring; (2) The structure of the existing packer is to compress the rubber cylinder first After the seat seal, the compressed slips are anchored, so the rubber cartridge will continue to move down a certain distance in the casing after the seat seal is complete. Such a release method will cause certain wear and tear on the rubber cartridge and affect the sealing effect; (3) the existing circlip The structure is relatively weak. When used in the well for a long time, due to well fluid corrosion, vibration and other reasons, the meshing of the one-way teeth will be loosened, causing the packer to be unsealed in advance; (4) the existing spring seat structure ( Figure 9 ) When the packer is released by hand, the release load will be transferred from the circlip to the circlip seat and then to the unsealing pin. If the release load is too large, the unsealing pin will be cut directly during release, causing the circlip to fail It cannot be sealed, and the installation of the unsealing pin on the spring seat will limit the size of the unsealing pin, resulting in insufficient thread length of the unsealing pin, which is not stable enough; (5) The anti-top slip used by the existing packer The structure is track type ( Figure 11 ), this structure will be stuck in the track due to well fluid corrosion and scaling after long-term use, resulting in the situation that the slips cannot be stretched out or retracted; (6) The existing integrated tool structure is not designed to leak In the pressure part, if the failure of the anti-top slip causes the packer to go up, the lower pressure cannot be released, and dangerous accidents are likely to occur; (7) The existing float switch structure is a solid float inside, which cannot pass the test instrument And in the case of a lot of sand in the fracturing well, the float switch will fail

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