SU1752917A1 - Drill pipe lock connector - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells. The purpose of the invention is to reduce the mutual wear of the casing and the lock joint of drill pipes. When working in. the well, the locking connection of drill pipes, including the nipple (H) and the coupling (M), connected between them by a locking thread, abrades the rock and the inner wall of the casing (OK), causing it to wear out. To avoid this, the surface H and M is reinforced with a wear-resistant coating in the form of multiple spiral strips, the recesses between which 1 are filled with a material with a low coefficient of friction. Reduction of mutual OKs and lock of connecting drill pipes is achieved tew; that abrazyvyoo oy- Art iznSotoykogo dokrytSh OK limited surface depressions filled with matorya Yaom horgbshymy antifriktsionnyyy uyaroprochn1 -1I svby- v va E, In row with atim material za-- full yuschy recess prevents chipping on impact and mikrorozanyyu OK. 1 il. h b

Description

The invention relates to drilling; ..; oil and gas wells, in particular to means for reducing the mutual wear of the casing and the lock connection of drill pipes.

A tool for drilling oil and gas wells is known, on the outer surface of which a layer / solid material is welded containing particles of sintered tungsten carbide distributed in a steel matrix.

The disadvantage of the tool is that in the process of wear of the steel matrix, the solid particles of sintered tungsten carbide, which interact in the process of drilling with the casing, are subjected to its wear.

Known joint connection of drill pipes, including a nipple and a sleeve, connected by a thread, a wear-resistant coating in the form of multiple-thread helical strips of opposite direction with formation of recesses between them is placed on the outer surface of the nipple and coupling. : -;

A disadvantage of the known construction of such a coating of the outer surface of a locking joint of drill pipes with the formation of recesses in the spaces between the helical strips lies in the inevitability of casing micro-cutting by projections of the casing.

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in collisions with it, as well as cutting out the coating itself.

Purpose of the invention; - reduction of mutual wear of the casing colonies and the lock joint of drill pipes.

This goal is achieved by the fact that the recesses between the wear-resistant screw strips are filled with a material with a low coefficient of friction. The drawing shows the lock connection of the drill pipe.

The locking connection of drill pipes 1 includes a nipple 2 and a coupling 3 connected by a locking thread C. On the outer surface of the nipple 2 and the coupling 3 from the opposite locking threads there is a wear-resistant coating 5 in the form of multiple starting screw strips in opposite directions with the formation of recesses 6 between them which are filled with material with a low coefficient of friction, g

To fill the recesses 6, metallic or non-metallic materials are used which have high impact strength and / low friction coefficient (for example, bronze, fluoroplastic, phenylone and others). -; ,,,. .

Reduced casing wear and lock-up of drill pipes during drilling

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is achieved by the fact that the abrasive, action of the wear-resistant spiral coating of the outer surface

The casing lock is bounded by the surface of the grooves filled with materials with good anti-friction and impact resistant properties. , This is facilitated by an increase in fac-

Yutichnogo contact area, and therefore a decrease. specific pressures in a pair of friction lock-ObesDna column. Along with this, the material of the recesses is a framework for hard coating, preventing it from chipping under impact and, to microcutting of the casing.

Claims (1)

Formula invented Locking connection of drill I. pipes, including a nipple and a sleeve, connected by a locking thread, placed on the outer surface of the nipple and coupling from opposite ends of the locking pipe, areas with wear-resistant coating in the form of multiple helical strips of opposite direction with the formation of recesses in the intervals between them. characterized by the fact that, in order to reduce the mutual wear of the casing and locking casing - the connection of drill pipes, the recesses between the wear-resistant screw-belts are filled with a material with a low 35 coefficient of training t5 20 25 thirty