A horizontal well reverse circulation jet screw drill

Abstract

The invention provides a horizontal well reverse circulation jet flow screw drill. The exterior of the screw drill comprises an upper connector upper portion, an upper universal shaft shell, a stator, a lower universal shaft shell, a transmission shaft shell and a sealing head which are sequentially connected from top to bottom. The interior of the screw drill comprises an upper connector lower portion, an upper universal shaft, a rotor, a lower universal shaft, a transmission shaft and a jetting head which are sequentially connected from top to bottom. A sealing rubber cup is connected to the middle of an upper connector. Jetting holes are formed in the peripheral direction of the jetting head. The sealing head is connected to the upper portion of the jetting head. The screw drill is small in size and compact in structure, the tool rotation speed is high, torque is large, maintenance is easy, the screw drill can be reused, and the screw drill has the advantages that drilling speed is high, carrying capacity is high, and the drill cannot be clamped by a pipe string easily; the quantity of needed circulating liquid is small, the discharge capacity is high, the flowback efficiency is high, a sleeving and milling tool is connected to the lower end of the screw drill, and the milling, sleeving, grinding and punching problems of a horizontal segment of a horizontal well are effectively solved.

Description

technical field [0001] The invention relates to the research field of downhole operation in oilfield development, in particular to a horizontal well reverse circulation jet screw drill. Background technique [0002] Sand production in horizontal wells mostly takes multi-segment and multi-cluster hole sections in the horizontal section as the sand production point, the sand production boundary is long, the oil flow direction and the sand settlement direction are perpendicular to the wellbore, and the sand bed is accumulated in a "wave" manner in the horizontal section. With the prolongation of the oil recovery production cycle, problems such as cementation of the bottom hole sand bed, casing scaling, and blast hole plugging appear in the process of oil recovery and production. At present, the traditional sand washing method in my country's oilfields has low operating efficiency, large leakage, and the cemented section of the sand bed is not easy to be washed away and cannot b...

AI Technical Summary

Problems solved by technology

At present, the traditional sand washing method in my country's oilfields has low operating efficiency, large leakage, and the cemented section of the sand bed is not easy to be washed away and cannot be completely carried out of the ground.

During the sand washing process, the pipe string is easy to be blocked by sand, and a sand jam accident occurs, which makes the sand washing operation unable to continue

[0003] Horizontal well sand washing has the following characteristics: First, the sand washing time is long and the efficiency is low

The phenomenon of sand settling is common in the horizontal section of horizontal wells. The average length of the "sand bed" is about 600m. The conventional reverse circulation sand washing footage is about 150m / d, and the sand washing time is long and the efficiency is low.

Second, the wellbore leakage is serious during the sand washing process

According to the observation of the objects returned from sand washing in the early stage, the returned sand grains are in a cemented shape with high hardness and are not easy to break, which makes the sedimented sand difficult to disperse, which affects the progress of sand washing and normal sand washing operations.

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