RU2320841C1 - Well drilling method - Google Patents

Abstract

FIELD: mining, particularly well drilling for water, oil and gas production, as well as underground leaching well drilling.

SUBSTANCE: method involves lowering drilling head connected to drilling string in well, wherein drilling head includes body with projecting sizing, cutting, radial conical, end and support parts; drilling well and sizing well bore. Projected sizing parts have reverse flare. Well is drilled with high speed and full load applied to drilling head to create non-drilled sections in well bore. Well sizing and non-drilled section drilling is carried out by reverse drilling. Support parts are arranged in upper body part and are made as centrators carried by non-drilled sections in well bore, which are defined by direct drilling.

EFFECT: increased efficiency and service life due to high-speed drilling and possibility to separate well drilling and well sizing operations.

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Description

The invention relates to mining, in particular to methods for drilling wells for water, oil, gas and underground leaching wells.

A known method of drilling wells, including the descent on the drill string, a drill head containing a housing with protruding gauge, radial conical, end cutting and supporting parts, drilling and calibration [1].

In the known method to reduce the forces of vibration, friction and increase wear resistance, protruding gauge, radial, conical, end and supporting parts are equipped with diamonds. The advisable area of use of the known method is limited to homogeneous and dense rocks of boring wells.

In addition, the combination of drilling processes with calibration and the need to overcome additional friction forces require significant energy expenditures, most of which are not productive.

The objective of the present invention is to increase efficiency and expand the scope of use.

The problem is solved in that in the method of drilling wells, including the descent on the drill string, the drill head, comprising a housing with protruding calibrating, cutting, radial conical, end and support parts, drilling and calibration of the wellbore, protruding calibration parts are performed with reverse taper, and the supporting parts are placed between the calibrating parts in the upper part of the body, drilling is performed at increased speeds and full load on the drill head, calibration during the reverse stroke with the rotary iem.

The invention is illustrated in the drawing.

The method of drilling wells is carried out by a device including a drill string 1, a drill head 2, comprising a housing with protruding calibration parts 3, radial conical parts 4, end part 5 and support parts 6, protruding calibration parts 3 are made with inverse taper, and supporting parts 6 placed between the calibrating parts in the upper part of the housing and made as stabilizing parts. The protruding calibrating and cutting parts of the body are equipped with reinforced inserts 7.

The inverse taper of the calibrating parts and the height of the supporting parts 6 are made based on the coverage and centering during the reverse drilling of the formed internal not drilled protrusions on the wellbore as a result of direct drilling.

The height of the drilled protrusions of the wellbore is determined by preliminary pilot drilling.

The work according to the method consists in the fact that drilling on the course equal to the length of the extended drill pipe is performed at increased tool revolutions (125-150 rpm) and a full load on the drill head.

At the same time, internal protrusions are formed on the borehole of the borehole, not drilled sections, on which the drill head 2 is centered by stabilizing bearings 6.

Drilling of the formed internal protrusions is performed by the calibrating parts 3 when lifting the tool with rotation produced for the production of the next building.

The method provides high-speed drilling of wells with optimization of drilling costs and increase the wear resistance of rock-cutting elements.

An example implementation of the method:

The construction of the pilot well is subject to the injection well PV in the area No. 1 with a depth of 200 m.

Work sequence:

- drilling the wellhead under the conductor;

- mount conductor;

- descent on the drill string of the drill head ⌀ 161 mm with conical cutting and calibrating bodies;

- drilling at full load on the drill head and increased revolutions (125-150) rpm per stroke equal to the length of the drill pipe;

- raising the drilling tool with simultaneous rotation and calibration of the wellbore during the reverse stroke;

- building up regular drill pipes and repeating the above drilling and calibration operations to the design depth of the well;

- carrying out further work according to the drilling project.

The source of information

1. RF patent No. 2092671, ЕВВ 10/26, 10/10/97.

Claims (1)

A method of drilling wells, including the descent on a drill string of a drill head comprising a housing with protruding calibrating, cutting, radial conical, end and support parts, drilling and calibrating the wellbore, characterized in that the protruding calibrating parts are performed with inverse taper, drilling is performed at elevated revolutions and full load on the drill head, form drilled sections in the wellbore, calibrate and drill the drilled sections during reverse drilling, and the reference th parts are placed in the upper part of the body and are performed as centralizers based on undeveloped sections in the wellbore formed by direct drilling.