SU1754879A1 - Core barrel - Google Patents

Abstract

Using; core drilling. SUMMARY OF THE INVENTION: The device comprises an core tube placed outside and placed therein to form an annular gap. The distribution unit of the washing liquid is made in the form of a housing with axial and lateral channels and a saddle for a waste valve. Distribution node is equipped with a glass. The glass is placed in the case with the open end upwards with the possibility of limited axial movement. In the extreme upper position, the glass overlaps the side channels of the housing. The housing has upper and lower stoppers for moving the cup and is connected with the lower end to the upper end of the core tube. The saddle is made in the bottom of the glass with a passage. 2 Il.

Description

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The invention relates to the field of drilling wells, and more specifically to technical means for core sampling.

A coring projectile containing external core and connected therein with a suspension node, a core receiving tube, a distribution unit of the washing liquid in the form of a housing with axial and lateral canals and a saddle for a waste valve are known.

Since the flushing fluid overflows through the top of the drill string during the descent process, the descent is carried out at a reduced speed. This partially reduces the pollution of the workplace, however, it slows down the descent of the coroner shell.

The purpose of the invention is to accelerate the descent of the coronary column /

Figure 1 shows the coring during its descent along the well at a well, a longitudinal section; figure 2 - the same, during the flushing of the well.

 The column projectile consists of an outer 1 connected by a suspension assembly and placed in it with the formation of an annular gap 2 of a core receiver 3 pipes and a distribution unit for washing liquid. The distribution node has a housing 4 with an axial 5 and side b channels and a saddle 7

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under the closure body 8. The housing 4 is screwed onto the upper end of the core-receiver tube 3 and provided with a cup 9 placed with the open end up in the housing 4 with the possibility of limited axial movement and blocking its side channels b in the extreme upper position. The housing A is made with the upper 10 and lower 11 limiting movement of the bowl 9. The saddle 7 is made with a longitudinal channel 12 in the front of the bowl 9. The areas of the through channel 12 of the saddle 7 and the annular space 2 between the outer 1 and core tube 3

5c: 5kp 0.08-0.2,

where Sc is the area of the passageway 12 of the saddle 7, cm2;

S / n - the area of the annular space 2 between the outer 1 and core tube 3 pipes, see

The hanger assembly of the tubes 1, 3 has a bearing 13 mounted by an inner holder in the housing 4, and an outer holder in the bore of the upper sub 14, which is threadedly connected to the outer pipe 1. The bearing 13 is clamped by a nut 15.

The column stern operates as follows. (

The coring projectile is lowered without a waste block 8 (Fig. 1). During the descent of the coring tube at a normal speed, a pressure drop occurs in the wellbore, under the influence of which the cup 9 rises to the upper limiter 10 and closes the side windows b in the housing 4. At this moment, the drill string is filled only through the passage 12 of the saddle 7 .

When deceleration of the drill string is slowed down, when the elevator approaches the rotor, and as the next drill plug is screwed in, the pressure in the well decreases. When the pressure from below decreases so much that it is unable to hold the cup 9 in the upper position, the latter begins to descend. When it is lowered, the side channels 6 open and an increased amount of flushing liquid begins to flow through them into the body 4 and further into the column of the drill pipes. Since the area of the side channels b and the annular space 2 is much larger (5 to 12 times) the area of the passage channel 12 of the saddle 7, the drill string has time to be filled with flushing fluid before the next candle goes down.

After completion of the descent of the coring jet, the well is flushed.

Since the axial channel 5 is free, the flushing fluid from the casing 4 of the razgolnitelny node passes through two paths: through the annular space 2 between pipes 1 and 3 and through the cavity of the core receiver pipe 3. At the same time, all sludge is washed out pipe 3, and in the annular space 2. After reaching with flushing to slaughter inside

columns of drill pipe throws a waste shut-off body (ball) 8, which, having reached the saddle 7, will block its passage channel 12 (figure 2). From this point on, the entire flushing fluid pumped through the drill string, from the distribution unit, enters only the annular space 2 between the pipes 1.3. After that, they start drilling with coring.

Having finished drilling to the length of the core tube 3, the core drill is lifted. During the lift, the flushing fluid from the drill string is poured into the well through the side channels 6 of the housing

4 distribution points and annular space 2,

The use of a coring device can accelerate its descent into the well and improve the working conditions of drilling workers.

crews by eliminating the siphon of flushing fluid during tripping.

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Claims (1)

Invention Formula The core projectile containing the core tube connected by the suspension assembly and placed in it with the formation of an annular gap, the distribution core of the washing fluid in the body, with the axial and lateral channels and the saddle for the discharge valve, which is accelerate the descent of the coring, the distribution assembly is provided with a cup placed with the open end up in the housing with the possibility of limited axial movement and blocking its side channels in the extreme upper position, with this om the body is made with the upper to the lower limit stops of the glass movement and is connected by its lower end to the upper end of the core tube, and the saddle is made with a passageway in the bottom of the glass, The seat channel and the annular space between the outer and core tubes are selected from the following relationship: Sc: SK.n. 0.08-0.2, where Sc is the channel area of the saddle, cm2; / / L P. Fig1 SK p - the area of the annular space between the outer and core tubes 13 10 four 9 .one 14 Fae 2