Sand prevention type temporary plugging valve capable of being opened and closed repeatedly and having reverse circulation function

Abstract

The invention discloses a sand prevention type temporary plugging valve capable of being opened and closed repeatedly and having a reverse circulation function, which comprises an upper joint, a reverse circulation cylinder sleeve, a spring support sleeve, a circulation valve compression spring, a reverse circulation piston, a sealing packing, a middle joint, a valve plate compression spring, a valve plate push cylinder, a valve plate and a lower joint, the upper end of the interior of the reverse circulation cylinder sleeve is provided with a circulation valve compression spring and a spring supporting sleeve, the lower end of the interior of the reverse circulation cylinder sleeve is provided with a reverse circulation piston and a sealing packing, the other end of the middle connector is connected with one end of the valve plate cylinder sleeve, and the other end of the valve plate cylinder sleeve is connected with the lower connector. A valve plate is arranged in the middle of the lower connector, a shear pin and a pin plug cap are arranged on the lower portion of the lower connector, and a valve plate compression spring and a valve plate push cylinder are arranged in the lower connector. The bottom dragging fracturing packer is matched, multi-layer fracturing can be carried out in a segmented mode without bridge plug packing, and reverse circulation sand washing and well washing can be carried out when sand blocking occurs.

Description

technical field [0001] The invention relates to the technical field of multi-layer fracturing of horizontal wells in oil and gas fields, in particular to a sand control type temporary plugging valve which can be switched repeatedly and has a reverse circulation function. Background technique [0002] At present, the fracturing of shale gas horizontal wells in China mainly adopts mechanical bridge plugs to isolate sections, including different types such as fast-drilling bridge plugs, large-diameter bridge plugs, and soluble bridge plugs. [0003] The bridge plug segmentation process has good effect, but it has high requirements on the diameter of the wellbore. The high-speed drilling bridge plug needs to be drilled and ground after fracturing, and the cost is high; the solubility of the soluble bridge plug is poor, and the controllability of the dissolution time is poor; the large diameter bridge plug There are pumping jams, difficult to handle, and the wellbore is not full ...

AI Technical Summary

Problems solved by technology

[0003] The bridge plug segmentation process has good effect, but it has high requirements on the diameter of the wellbore. The rapid drilling bridge plug needs to be drilled and ground after fracturing, which is expensive; the soluble bridge plug has poor solubility and poor controllability of the dissolution time; the large diameter bridge plug There is pumping stuck, which is difficult to deal with. After fracturing, the wellbore is not full-bore and affects drainage and other subsequent operations (such as sand washing, production logging, and tubing running)

Images