SU945366A1 - Core tool - Google Patents

Description

(S) COLUMN SHEET

one

The invention relates to a technique for drilling exploration wells, and specifically to a device for drilling with core sampling.

A well-known projectile is used for drilling wells with coring, containing an adapter, a core-receiving tube and a rock-breaking tool l.

The drawback of the device is low e (|) efficiency due to the fact that when drilling over unstable, fractured rocks, core core self-sticking in the core tube occurs, and this, in turn, makes it difficult to extract it from the pipe, which violates the representativeness of the core. In addition, self-coreing leads to a decrease in core recovery rate.

A well-known columnar, including an adapter, a core tube, a rock destructive tool, and an ellipsoidal striker body.

suspended in the adapter with the possibility of angular displacement relative to the longitudinal axis of the projectile and forming an annular diffuser 2j with the core-receiver tube.

5 The disadvantage of this projectile is its low efficiency, since the excitation source of the oscillations (firing pin) is located in the upper part of the core-receiving tube, therefore, the vibration intensity in the lower part of this tube is insignificant, as a result of which the core can self-quench.

The purpose of the invention is to increase the core yield,

15

This goal is achieved by the fact that the projectile is equipped with a movable support with longitudinal channels placed in a core-receiving tube, with the tube mounted on the support.

20

Such a movement of the striker along the length of the core-receiving tube, as it is filled with the core, allows more efficient use of vibration for

Avoid self-coreing, as the source of vibration is always in close proximity to the core. In addition, the firing pin is associated with a support that is in constant contact with the core, and therefore, the vibration experienced by the support is also transmitted to the core. .

FIG. 1 shows the proposed s. Nar d, general view; in fig. 2 - snf d, filled with core; in fig. 3, section A-A in FIG. one.

The gear consists of a core-receiving tube 1, in the upper part of which an adapter 2 is fixed, and in the lower rock-breaking tool 3. Inside the tube 1 there is a striker k, a spring 5 and a support 6, interconnected. Through hole 6 is provided in support 6 for passage of washing liquid. In the inner cavity of the pipe 1 is the core 8.

Snar d works as follows.

When drilling a well, the internal cavity of the core receiver pipe 1 is filled with a core 8, causing the striker k with the support to move upwards. At the same time, the washing liquid, washing the impact head 4, causes it to strike the core receiver tube 1. The reaction from the impact of the hammer is also transmitted to the support 6 through the spring 5 in the form of elastic pulses. The total vibration effect in the first case from the pipe body 1, in the second from the support 6, is transmitted to core 8, excluding its self-jamming. The possibility of free movement of the support

6 briskly contributes to the location of the source of vibration in the immediate vicinity of the core 8. The use of a projectile for drilling

geological exploration wells with core sampling will improve the productivity of the drilling process and, consequently, produce more efficient core sampling, and in general

increase the efficiency of work yes. The possibility of increasing the productivity of the drilling process is achieved by eliminating the self-quenching of the core in the original

stages of well drilling, as the source of vibration is in close proximity to the drilling tool.

Claims (2)

Invention Formula The columnar, which includes an adapter, a core tube, a rock destructive tool and a block, characterized in that, in order to increase the core output, it is equipped with a movable support with longitudinal channels located in the core tube, and the block is mounted on a base. Sources of information taken into account in the examination 1. SI Kuvykin. Drilling of oil and gas wells of small diameter. M., Nedra, 1967, p. 261-262. 2. USSR author's certificate №, cl. E 21 V 25/00, 1973 (prototype).