SU58636A1 - Casing Shoe Guide - Google Patents

Description

When the bore holes are drilled by casing pipes, snapshots when the lowering of the pipes cannot be brought to the planned depth or to the bottom due to the presence of protrusions or curvature of the wells. The pipe string is placed on the protrusion or the iB wall of the well is bumped at the point of curvature. In such cases, an attempt is usually made to force the column in, or a lift is made for the subsequent correction of the Well. But at the same time there is a risk to turn the column in a threaded joint or to agitate the coloin with the ends into the wall of the wells in the no-fiM direction with soft motives.

The rise also always succeeds, since the column during this time manages to accumulate sludge. It is precipitated with precipitating sludge or clay when using GLINY washing.

For the passage of the curvature, yielding in the form of a peeling pebble or a displaced boulder, the casing shoe is supplied with a guide head.

The use of such heads is conjoined with ryok, since their design does not ensure free immersion of the iB string into the drilling fluid, thus resulting in sticking from the sludge from the string.

The proposed casing casing guide head is free from these drawbacks due to the fact that it is equipped with longitudinal sector cuts. This makes it possible to pass drilling fluid.

In the drawing of FIG. 1 shows the front view of the head; FIG. 2 - its longitudinal section; FIG. 3 is a plan view.

The head is provided with four or several longitudinal ribs 1 with sector cuts 2 located between them. The upper end of the head has a thread 3, the lower one has a conical shape. The middle part of the die has a diameter equal to the diameter of the casing.

The guide head is connected to the end of the pipe strings by means of an existing thread. During the descent, due to the conical shape of the guide head, the column bypasses unevenness and curvature.

Cutouts 2 when immersed in the drilling fluid in the column pass the latter into the pipe, do not drive it into the annular space and not laps so washing the column.

The head can be made of wood, metal, or a combination: the middle part is made of metal, and the ribs are made of wood, ebonite, and so on. Choose the casing shoe head, that is, so that, in order to pass the fluid, it is moreover) on the longitudinal sector cuts.

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