A pumping retrievable electronically controlled hydraulic cup tool

Abstract

The invention provides a pumping recyclable electronically controlled hydraulic rubber cup tool, and belongs to the technical field of well completion and production of oil and gas wells. The tool includes a power mechanism, a transmission mechanism, a rubber cup and a rubber cup sleeve; the power mechanism is connected to the transmission mechanism; and the transmission mechanism drives the rubber cup to stretch out of the rubber cup sleeve and retract the rubber cup sleeve. Through a combination of a screw nut mechanism and a hydraulic piston mechanism, and the stretching out and retractingof the rubber cup realized by downhole pressure, the rubber cup can open a tight sleeve when going down, so that the convenient and rapid placing of a sectional completion tool by pumping can be realized, and excessive leakage of completion fluid can be avoided. The retracting of the rubber cup can be controlled through cable transmission power signals on ground when a completion string is in place or gets stuck, so that the completion tool can be conveniently lifted by a lifting cable.

Description

technical field [0001] The invention belongs to the technical field of well completion and production of oil and gas wells, and in particular relates to a pumping recoverable electronically controlled hydraulic cup tool, which is used for horizontal well cable conveying or pumping segmental completion, segmental fracturing and water control completion. well. Background technique [0002] With the exploration and development of unconventional oil and gas resources such as shale gas and shale oil, the staged fracturing technology of horizontal wells has been effectively implemented. Reservoir fracturing technology is to divide horizontal wells such as shale oil and gas and tight rock formations into multiple sections, and then fracture the formation into multiple fractures to expand the oil drainage area of ​​oil and gas production layers, improve oil and gas recovery, and thus increase single well production . [0003] Horizontal well staged fracturing completion technology...

AI Technical Summary

Problems solved by technology

Since such completion strings are all conveyed by cables, in order to overcome the downhole casing friction and downhole pressure during the delivery of the completion strings, it is necessary to use fracturing trains to pump large-volume completion fluids into the completion strings. Since there is a certain gap between the completion string and the casing, the completion fluid will enter the depressed formation from this gap, which will cause a lot of waste of completion fluid on the one hand, and on the other hand, the excessive completion fluid entering the formation will cause damage to the formation. Stratum damage affects production capacity

In order to prevent the completion fluid from entering the formation, a leather cup will be added to the tool of the completion string, which will be close to the casing. The clearance of the completion string flows around into the lower formation, but because the cup is too tight or the gap is too small relative to the casing, the completion string will encounter The card is blocked, causing an underground accident

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