SU601388A1 - Core extracting sectional tool - Google Patents

Description

one

The invention relates to the drilling of wells, namely, core sampling devices.

The coring section section is known, equipped with centralizers.

However, this coring device of the map's s are effective in IB due to the presence of a gap between the centralizer and the borehole wall.

The coring section cut is known, including a drill head, body sections with core pipes and nozzles 2j installed below, above and between the sections.

In order to ensure the conductivity of the projectile in the wellbore, in this case it is recommended to use centralizers with a diameter is is 4 mm smaller than the diameter of a drill head,

The disadvantage of this projectile is that the application of known centralizers can eliminate the radial gap between the 20 projectile and the borehole wall and, consequently,. but, radial vibrations of the coring screen. In addition, the broadening of the stem in the process of drilling due to the beats of right rotation, eccentricity of the gear also leads to an increase. 25

this gap and increase the level of radial vibrations ..

The chain of the invention is to improve the efficiency of coring by improving stabilization and reducing the level of radial vibrations.

The chain comes with the fact that the coring sectional shell is equipped with expanders, each of which is installed under the centralizer, and the diameter of the subsequent extender and centralizer is larger than the diameter of the previous one in the direction from the drill head.

The diameter of the reamer and the centralizer should be determined in accordance with the ratio

P

pn

CPU TZGG-b

where d-fj is the diameter of the expander, mm;

d E is the diameter of the drilled head, MKQ O1 is the magnitude of the broadening of the barrel, MMJ hf is the serial number of the expander or centralizer in the direction from the drill head;

u, n. centralizer diameter, mm;

& 1-1,5 mm - the gap between the well and centralizer.

In the drawing, the image of the proposed Kertiscore, D.,

(The barn consists of a drill bit 1, expanders 2-4, centralizers 5-7 and sections of housing 8 and 9.

The coring device is as follows., D

After the cnj-skip of the projectile and the start of drilling of the drilling g-bearing 1, a barrel of nominal diagetra is formed. The stem calibration and styling of the coring projectile are carried out in pairs of 5 cores and centralizers 2 and 5, 3, and 6, 4 into 7, respectively, installed below, above and sections 8 and 9, each of the extensions 2-4 and having The depth determined by 1 is 1–2 mm greater than the last whisper of the previous pattern. centralizers 5-7, defined by formula 2, are in such dependencies.

Expanders eliminate the need for a hack (25 projectile and wall of the barrel at various levels along the length of the projectile and prevent it from hanging up when the drill head is worn out.

The centralizers increase the base of the projectile elements when there is local borehole yiiiHfJOHHft. Ksetichvst. in sections it can be equal to two, as shown in the drawing, three or more.

When working with such a bipogar ze TOivjy, that the above-placed expander has a larger diameter than the previous one, it ensures a good concentration of the borehole in the borehole, prevents its blockage in the borehole core removal, which increases the efficiency of drilling.

In accordance with the results of the foaming of the proposed projectiles, it was established that the gesture of the central tool in the well sharply increased the efficiency (}) of the drilling process with core sampling. In the acts of testing the projectile, it is distinguished that the stability of the ball-boring drill head and the removal of the core are doubled.

Claims (2)

Invention Formula A coring section shot, which includes a drill pipe, a casing with a tube with tubes and installed under, above and between the section, with the aim of increasing the efficiency of core selection due to improved stabilization “Dash the level of radial vibrations, it is equipped with an expander ln, each of which is installed under the centralizer, and the diakdatr of the subsequent expander and centralizer are larger than the diameter of the previous one in the direction of the drill head. 2. Snar d on p. 1, about tl and h and y with the fact that S1 / et-p extender and centralizer are determined in accordance with the ratio „-Dg-“ -K, cct rp-b, where dpr, the diameter of the expander, mm; dg, - diameter of the drill head, mm; but -. widened trunk size, mm; f is the serial number of the extender T5ln of the centralizer in the direction from the drill head; "Dtsp-diameter centralizer, mm; b 1-1,5 mm - the gap between the well and centralizer. Sources of insight taken into account during the examination: 1. Morozov Yu. T. Drilling of drilled wells and multilateral wells of small diameter. L „Nedra, 1076, p. 215. 2. Instructions for the use of a coroner shell. M ,, Nedra, 1975, p. 6