Ultra-short radius radial well-drilling tool system

Abstract

The invention relates to an ultra-short radius radial well-drilling tool system used for well drilling and completion operations in oil production and comprising a sleeve perforating system and a high-pressure ejection system. The ultra-short radius radial well-drilling tool system comprises a lifting joint, an elbow joint, an upper joint, a rotating joint, a thrust ball bearing, a single-row centripetal ball bearing, a base, a central tube, a sucker rod, an oil pipe, a screw rod, a high-pressure hose, an upper fixed joint, an upper joint of a universal joint, a rail groove, a universal joint, a shaft pin, a cruciform joint, a drill plate, a drilling tool joint, a drilling tool, a lower joint, a high-pressure nozzle and a locating anchor. The high-pressure ejection system comprises a ground high-pressure pump, the sucker rod, the high-pressure hose, the rail groove and the locating anchor. Firstly, the sleeve perforating system is used for drilling a hole with the diameter being not less than 25 mm in the wall of a sleeve at the design depth of an oil well; a pipe post of the sucker rod and a perforating cutter are brought out, connected with the high-pressure ejection system and taken into the well; and the high-pressure hose takes the high-pressure nozzle into the hole through the rail groove for high-pressure ejection. The well drilling system solves the problem that old wells increase oil draining area, and can be widely applied to oil well drilling and completion operations.

Description

Technical field: [0001] The invention relates to an ultra-short-radius radial drilling tool system for drilling and completion operations in oil production. Background technique: [0002] At present, most old oilfields in my country have entered the middle and late stages of development. How to use drilling methods to improve the efficiency of remaining oil recovery, improve the effect of oilfield development, reduce development costs and avoid oilfield development risks has become an important issue. [0003] The proven hard-to-recover low-permeability and ultra-low-permeability blocks in the Liaohe oil region account for 21.1% of the proven reserves and about 80% of the unproduced reserves. The development recovery rate is only 7.2%. By 2005, the number of 51 / 2”casing long shutdown wells has reached more than 10,000. At the same time, Liaohe Oilfield has been developed for more than 20 years, and the pressure coefficient of the main block is getting lower and lower. Tradit...

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Problems solved by technology

At the same time, Liaohe Oilfield has been developed for more than 20 years, the pressure coefficient of t...

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