String pressurization device

Abstract

The invention relates to a tubular column pressurizing device which consists of an uplifting-preventing mechanism, a hydraulic cylinder assembly and a reversion-preventing mechanism, wherein trapezoidal blocks (6) serving as main body parts of locking parts of the uplifting-preventing mechanism and being opposite to well entrance tubular columns are symmetrically arranged on a slotting flange (10); when the well entrance tubular columns move upwards, rolling shafts (1) inwards support against the well entrance tubular columns by a rectangular groove which forms a trapezoid with the axes of the well entrance tubular columns in the trapezoidal blocks (6), so that the well entrance tubular columns cannot move upwards; a piston (18) of the hydraulic cylinder assembly drives the uplifting-preventing mechanism to move downwards under the action of liquid pressure to apply downward pressure to the well entrance tubular columns; three rotary handles (25) are uniformly distributed on the peripheries of the well entrance tubular columns to function as the main body of the reversion-preventing mechanism; steel balls (26) are arranged in holes formed in the three rotary handles (25); and when the well entrance tubular columns rotate reversely, the steel balls (26) inwards support against the well entrance tubular columns by the inner holes of the rotary handles (25), so that the well entrance tubular columns cannot rotate reversely.

Description

technical field [0001] The invention relates to a drilling and repairing device for an oil-water well in an oil field, which is installed at the well head and can prevent the rotation of the entry pipe string and apply downward pressure to the well entry pipe string. Background technique [0002] Drilling rigs or well workover rigs are generally used in conventional workover operations of oil and water wells, because these two types of equipment generally do not have a rotary table, and only a tubing string structure with a tubing plus a screw drill (with a drill bit) can be used for drilling operations , when the drilling position is close to the wellhead, relying on the weight of the entry pipe string cannot exert enough pressure on the drill bit, and sometimes even using the drill pipe (or drill jack) as the entry pipe string cannot reach the required WOB for drilling . At the same time, because the drilling string cannot overcome the reverse torque generated by the dril...

AI Technical Summary

Problems solved by technology

[0002] In the conventional workover operations of oil and water wells, well drilling rigs or well workover rigs are generally used, because these two types of equipment generally do not have a rotary table, and only a tubing string structure with a tubing plus a screw drill (with a drill bit) can be used for drilling operations , when the drilling position is close to the wellhead, relying on the weight of the entry string cannot exert enough pressure on the drill bit, and sometimes even using the drill pipe (or drill string) as the entry string cannot reach the required pressure on bit during drilling

At the same time, because the entry pipe string cannot overcome the reverse torque generated by the drill bit, the pipe string reverses during drilling, but the drill bit does not rotate, resulting in the failure of normal drilling construction

[0003] At present, although there are devices for pressurizing the entry pipe string, they are all used for pipe string running in construction. The working principle is to lock the entry pipe string with slips or clamps, and apply downward pressure to the pipe string. Prevents rotation of the pipe string and therefore does not meet construction requirements for drilling with auger drills

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