Automatically-opening self-sealing downhole differential pressure sliding sleeve

Abstract

The invention provides an automatically-opening self-sealing downhole differential pressure sliding sleeve, and belongs to the field of oil and gas well reservoir reconstruction. The automatically-opening self-sealing downhole differential pressure sliding sleeve comprises an outer shell (1), a valve clack seat slot (2), a sliding sleeve valve (3), an outer sleeve (4), a battery (5), a lower contact (6), a shear pin (7), a through hole (8), a valve clack (9), a valve limiting lock (10), a hinge (11), a lock actuator (12), a first sealing ring (13), a downhole control circuit board (14) and a second sealing ring (15). Sealing rings comprises the first sealing ring (13) and the second sealing ring (15). The automatically-opening self-sealing downhole differential pressure sliding sleeve canset the opening time of the downhole differential pressure sliding sleeve in advance on the ground and automatically controls the opening of the downhole differential pressure sliding sleeve, and compared with an existing downhole sliding sleeve requiring pitching or tripping-in sliding sleeve switch tool turned on, the operation is simple; and according to the situation of multiple differential pressure sliding sleeves in a same well, different opening time can be set for each differential pressure sliding sleeve.

Description

technical field [0001] The invention belongs to the field of reservoir transformation of oil and gas wells, in particular to an automatically opened self-sealing downhole differential pressure sliding sleeve. Background technique [0002] At present, various oil-casing connection downhole switch tools are often used in oilfield delamination measures, casing inspection, leak inspection and other pipe strings. Patent Publication No. 200520106918.0 (Double-sliding-sleeve sand blaster), because its structural design requires that the tool needs to be thrown to press after the tool is in place, so that the channel is opened. When the wellbore is dirty or the oil well produces sand, etc., there are cases where the ball is not in place or the ball is thrown. Afterwards, there are problems such as long waiting time; when the ball is not in place, the packer supporting the pipe string cannot be set, and the original pipe string can only work normally after being lowered at the beginn...

AI Technical Summary

Problems solved by technology

Patent Publication No. 200520106918.0 (Double-sliding-sleeve sand blaster), because its structural design requires that the tool needs to be thrown to press after the tool is in place, so that the channel is opened. When the wellbore is dirty or the oil well produces sand, etc., there are cases where the ball is not in place or the ball is thrown. After the long waiting time and other problems; when the ball is not in place, the packer supporting the pipe string cannot be set, and the original pipe string can only work normally after being lowered at the beginning, which affects the normal work of the oil field

[0003] In addition, in the existing design, multiple sliding sleeves are placed downhole for staged fracturing and acidification, and they need to be opened separately during construction.

If the ball-pitching sliding sleeve is used, the number of stages is limited, and the inner diameter of the pipe is limited, which is not conducive to later mining; if the sliding sleeve is opened with the downhole sliding sleeve switch tool, there will be problems of long operation period and high cost

Images