Switch tool for small diameter sliding sleeve

Abstract

The invention provides a switch tool for a small-drift-diameter sliding sleeve for oil filed well completion. The switch tool comprises an outer barrel body, an upper connector and a lower connector; an oblique line device and a thrust spring are arranged inside the outer barrel body, and a clamping block is arranged on the oblique line device and can stretch out or retract back from a clamping block window on the outer barrel body along with vertical movement of the oblique line device. As the clamping block performs the reciprocating motion, and a hydraulic or mechanical pressure device is not needed for controlling, the volumes of the sliding sleeve and the switch tool are effectively reduced, the inner drift diameter of the sliding sleeve can be reduced to 1.5 inches, and the switch tool is particularly suitable for small-size well fracture construction. In addition, as the hydraulic or mechanical pressure device is not needed in the switch tool for the small-drift-diameter sliding sleeve, compared with a traditional sliding sleeve, a tool structure is simplified, corresponding working procedures are reduced, and the safety performance is further improved.

Description

[0001] Technical field: [0002] The invention relates to the field of oil drilling, in particular to a switch tool for a small-diameter sliding sleeve used in oilfield well completion. [0003] Background technique: [0004] Sliding sleeve staged fracturing device is an important device for the exploitation of unconventional oil and gas resources. It is widely used in fracturing stimulation of vertical wells, directional wells, and horizontal wells in shale gas, low permeability production layers, and thin oil layers. In these applications, usually after fracturing, the fracturing holes are selectively closed and / or opened according to the fluid flow of the production layer to achieve the purpose of layered plugging testing and production. The selective closing and / or opening of the fractured holes usually requires the use of corresponding opening and closing tools. [0005] For some switch-type sliding sleeves, a switch column or a device with a similar function is usually u...

AI Technical Summary

Problems solved by technology

In the current operations of horizontal wells and deep wells, because the fracturing position is far away from the wellhead, the shut-in string is easily blocked and cannot be run normally, or the switch string cannot effectively transmit the driving force to the sliding sleeve. , resulting in inability to open and / or close the frac holes smoothly

In addition, when the switch tool is affected by cuttings erosion, cement slurry blockage or other abnormal conditions, it often cannot be recovered normally, affecting the opening and / or closing of the fracturing hole, and the reliability is difficult to guarantee

[0006] Although there are relatively mature switching tools for sliding sleeves with large inner diameters, when the inner diameter of the sliding sleeve is less than 2 inches, due to limited space, the current structure of switching tools cannot smoothly realize the operation of switching sliding sleeves

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