Circulating drilling-free blind plate cementing device

Abstract

The invention relates to a circulating drilling-free blind plate cementing device for semi-stroke cementation and plug-free cementation of a horizontal well for oil drilling. In particular, the circulating drilling-free blind plate cementing device comprises a diverting short joint, a circulating short joint and a sealing rubber ring and is characterized in that the circulating short joint is arranged in the diverting short joint and is fixedly connected with the diverting short joint through a fixing bracket and a fixing shear pin; a seat sealing rubber cylinder is arranged in the circulating short joint and is fixedly connected with a fishing short joint; a seat sealing flange is arranged outside the seat sealing rubber cylinder; and a sealing protective cover is arranged outside the diverting short joint, a closing spring and a seat sealing slide sleeve are arranged in the sealing protective cover, and the lower end of the diverting short joint is linked with a casing packer hoop through a threaded buckle and is sealed by the sealing rubber ring. The casing wear, window opening and borehole rejection caused by drilling blockage during cementation can be avoided.

Description

technical field [0001] The patent of the present invention relates to a circulating drilling-free blind cementing device for oil drilling horizontal well half-process cementing and plug-free cementing, especially a circulating drilling-free blind cementing device. Background technique [0002] At present: Half-stage cementing of horizontal wells is mostly used 1. Drilling blind plate cementing technology: cementing plug is a cementing technology commonly used at home and abroad; drilling blind plate is easy to open the casing window, causing new wells to be scrapped; Due to the wear and thinning of the drilling blind casing, it is prone to breakage and leakage during gas injection; the production life of the oil well is shortened, and there are many hidden dangers. 2. Non-circulation and drilling-free blind cementing technology: This technology also has many defects and deficiencies, such as: easy drilling during salvage, causing downhole accidents; in addition: experiments ...

AI Technical Summary

Problems solved by technology

[0002] At present: Half-stage cementing of horizontal wells is mostly used 1. Drilling blind plate cementing technology: cementing plug is a cementing technology commonly used at home and abroad; drilling blind plate is easy to open the casing window, causing new wells to be scrapped; Due to the wear and thinning of the drilling blind casing, it is prone to breakage and leakage during gas injection; the production life of the oil well is shortened, and there are many hidden dangers

2. Non-circulation and drilling-free blind cementing technology: This technology also has many defects and deficiencies, such as: easy drilling during salvage, causing downhole accidents; in addition: experiments have proved that the diameter of the open hole packer rubber tube currently used expands by 70-80mm , when the pressure is 4-6MPa, the vulcanized parts at both ends of the rubber cylinder will break, so the conventional open hole packer is prone to seal not tight, resulting in cement slurry stringing and cement plug; also: when the lower casing is blocked, the pump cannot b

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