Blocking ball device for horizontal well core drill

Abstract

The invention relates to a blocking ball device for a horizontal well core drill, which comprises a blocking ball, a conical spring and an improved inverse-spraying mechanism. A pore path is drilled on the middle part of a spray chamber base of the inverse-spraying mechanism, the diameter of the pore path is less than that of a ball body of the blocking ball; the conical spring is arranged between a spray chamber inner sleeve and the spray chamber base of the inverse-spraying mechanism and is connected and fixed by threads of a spray chamber outer sleeve and the spray chamber base; the conical spring is used for guiding the blocking ball, and simultaneously, ensures that drilling fluid flows through the pore path; the blocking ball consists of the ball body, a connecting piece and a guiding spring; the connecting piece is in welding or threaded connection with the ball body; the guiding spring is fixed on the connecting piece in a welding or bonding mode; and the guiding spring is made of spring steel wires. The blocking ball device is used for the horizontal core drills, can solve the problems of the accumulation of ineffective cuttings in flushing cutting beds of a horizontal well section and core tubes of the core drills effectively and keep the inverse-spraying performance of the drills, and is favorable for improving core recovery rates. The blocking ball device has the advantages of simple structure and good using effect, and is suitable for the horizontal core drills.

Description

Technical field [0001] The invention relates to a plugging ball device for a horizontal well coring tool, which is a device for a horizontal core drilling tool and belongs to the field of core extractors for drilling. Background technique [0002] Improving the productivity of a single well is the most important goal of horizontal well construction, but the productivity of the horizontal well after completion often fails to meet the expected target. The drilling and completion process has caused damage to the production zone. If some cores are taken from the key parts of the horizontal well construction, a comprehensive test and analysis can be carried out through the cores taken to judge the target status, damage degree and damage type of the horizontal well. During the construction of horizontal wells with thin pay zones, cores can be collected as needed, which can provide a direct research object for in-depth research on the damage of engineering factors to pay zones. ...

AI Technical Summary

Problems solved by technology

However, in horizontal wells, the coring tool is in a horizontal position when it reaches the bottom of the well. In conventional drilling methods, a large amount of cuttings may settle at the bottom of the horizontal section during the long-term drilling process. , invalid cuttings may first occupy the limited length space of the core tube, which affects the single-time recovery rate of the core; if drilling directly in the middle of the spray chamber, it is easy to flush the cuttings, but because there are various functions in the spray chamber If the channel is to be blocked after flushing, there is a disadvantage that the input of ordinary steel balls is more likely to enter other channels by mistake and affect the normal use of the anti-spray drilling tool

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