SU1629460A1 - Weighted drill pipe - Google Patents

Abstract

The invention relates to a mining case and is intended for the drilling of wells, in particular to drill strings. The purpose of the invention is to increase reliability in operation, to facilitate down-lifting operations and fishing operations. The pipe consists of a nipple 1 and coupling 2 locking threaded sections. Section 3 of the pipe on the side of the nipple has the largest diameter, and section 5 on the side of the coupling has the name

Description

The invention relates to the drilling of oil and gas wells, in particular to drilling equipment.

The aim of the invention is to increase the reliability of work, to facilitate tripping and fishing operations in case of accidents.

Fig. 1 shows an utterly desirable drill pipe (UBT); 2 is a candlestick composed of a collar.

UBT includes locking threaded sections located at its ends; the nipple section 1 and the coupling section 2. The body of the upgraded drill pipe is formed by sections 3-5 having different diameters, respectively, DJ, HZ, and the pipe body at section 3 has a diameter B on the side of the nipple, and the pipe body is in section 5 has a diameter that is the smallest.

Between the nipple and coupling sections, the pipe body has areas with successively decreasing diameters.

In the case indicated in FIG. 1, this will be a section 4 having a diameter equal to the half-sum of the diameters of the sections 3 and 5 of the pipe.

The length L, 1.2., 1-e, respectively, of the pipe sections 3-5 is preferably selected from the ratio L1: L2: L 0.2: 0.4: 0.4.

The internal diameter d of the axial channel of the UBT can be both the same along its length and slightly increasing from section 3 to section 5, as shown in FIG. 1, i de d c is the internal diameter of the axial channel of the nipple 1 ad ″ - internal diameter of the axial channel of the coupling section 2,

When assembling the candle (Fig. 2) of the described drill collar on the candle of the oGpa-wKiTcn ledges b.

0

five

0

five

The pipe works as follows.

During the descent of a candle (Fig. 2), formed by several loose pipes and a drill string installed in the assembly between the loose bottom and the drill pipes, a ledge 6 is used for the suspension in the elevator.

And in the process of working in the well, the body of the UBT at section 3 over the outer diameter of the nipple part, section 5 of the adjacent pipe is protected against wear, i.e. the outer diameter of the coupling part,

As a result, in the drilling process, the ratio of the axial moments of resistance of the dangerous sections of the coupling and nipple is unchanged, as it eliminates the change in the size of the coupling elements that affect the magnitude of the axial moments of resistance of the dangerous section of the coupling and ni-arm.

 dHM

0

five

0

3 14 to them WM- -А-- .---.;,

D dM1)

where W "is the axial moment of resistance of the dangerous section of the coupling; outer diameter of the coupling; outer thread diameter of the coupling,

c m t, 3,14 / den-с к-.

Wh cho

to

where W c is the axial moment of resistance

dangerous nipple section; d EX - internal diameter of the thread

nipple;

d is the inner diameter of the axial channel of the nipple.

During the operation of the drill pipe string at the installation site of the described pipelines, a smooth change in rigidity from the heavy bottom to the drill bit Tpv-bam ich is ensured due to the gradual reduction of the diameter of the drill collar.

51

In the event of a stuck bottom of the drill string, the upper uncoupled part is turned over the upper threaded closing of the candle (Fig. 2) of the UBT and, since the upper section of the UBT has a reduced diameter, it is possible to place the catching means on the outside of the pipe in the gap formed by the latter with the wall wells.

Technical and economic efficiency is to increase the service life of the drill string.

62Y460

Formula

the invention

0

five

A flat drill pipe, including a nipple and socket lock threaded sections at its ends and a pipe body formed by sections of various diameters, is characterized in that, in order to increase reliability in operation, to facilitate launching and fishing operations, The nipple has the largest diameter on the side and the smallest on the coupling side, with pipe sections with different diameters arranged in series decreasing from the nipple to the coupling part.

i

Uj

6

Claims (1)

Claim A weighted drill pipe, including nipple and sleeve threaded lock sections at its ends and a pipe body formed by sections of various diameters, characterized in that, in order to increase reliability in operation, facilitate tripping and fishing operations, the pipe section on the side of the nipple has the largest diameter, and on the coupling side the smallest, and pipe sections with different diameters are arranged sequentially decreasing from the nipple part to the coupling part. I G ” 1 L. ----------, ------------ ¹ --- I Figure 2