SU998726A1 - Method of drilling with core-taking - Google Patents

Description

(54) DRILLING METHOD WITH CERN SELECTION

FIELD OF THE INVENTION The invention relates to mining, in particular to well drilling methods with core sampling.

There is a known method of core drilling, which includes alternate drilling with a coring projectile, a projectile for digging a slaughter and a coring projectile with a removable core receiver Cl 7-.

The disadvantage of this method is a small core diameter.

There is also known a method in which the selection of cores of large diameter is. There is a core projectile in which a bit is embedded for drilling without core sampling. The method includes descending to the bottom of a core projectile containing a core in the hydraulic channel of the core picker, drilling with washing the core to the test interval without core sampling, house in the sampling interval with coring, capturing the core and extracting it to the surface 21.

i However, the implementation of the known method of matching with the complication of techno logy in connection with the need to use a special drill bit and drill bit along with a core drill bit

with a slaughter and embedded in the core.

The aim of the invention is to simplify drilling technologies by reducing the nomenclature of the bits used.

This goal is achieved by the fact that, according to the method of drilling with core sampling, including descending into a coring projectile, containing a corenator controlled via a hydraulic channel, drilling with a projectile up to the test interval without core sampling, drilling in 15 Core sampling, core capture and its extraction to the surface, drilling and testing are conducted with periodic snippets of the projectile from the bottom, removal of the core from the core projectile and drilling it into the hammer.

The technologist of the method consists in the followup.

Kolonkovy .snar d with core

25 in the open position, they are lowered to the bottom of the well and drilled in the mode of intensive destruction of the rock at the bottom. In the process of drilling, periodically, they raise sleep 30 J) d over the face by a value of several

greater than the interval passed. The core formed at the same time under the action of the dynamic forces of the colettes into pieces, is poured out of the core shells and destroyed by a chisel during the reverse movement of the projectile into 11 very fine particles that are removed by the well fluid flow. In such a sequence of operations, a hole is drilled to the sampling interval, which is established by mechanical karateem. In the sampling interval, drilling is carried out in a mode that ensures the safety of core in the core drill, and without detachment of the projectile from the bottom. After the core is filled with the pressure of the fluid flow, the core is transferred to the closed position and the core and the core are removed from the well,

d

The application of the proposed method will make it possible to carry out more complete drill bit processing, reduce the number of tripping operations and improve drilling performance.

Claims (2)

1. Grebenyuk A.A. Core technology and technology. M., Nedra, 1973, p. 5-7, 2. Patent of the USSR. 703037, cl. E 21 B 25/00, published 1971 (prototype).