SU1105602A1 - Drilling string - Google Patents

Abstract

DRILLING COLUMN, including external and internal pipes forming three channels, concentrically located relative to each other nodes connecting the internal and external pipes with transverse partitions along the ends, and sealing, characterized in that, in order to improve the reliability of operation, the node connecting the internal pipes Designed as two pair-wise telescopically mounted nozzles, one end of which is rigidly connected to the external pipe connection unit.

Description

01

about

about.

nineteen

The invention relates to the field of drilling and testing predominantly exploratory and exploratory production wells with backwash, in particular, to multi-channel drill strings. The known drill string consisting of drill sections with parallelly arranged external air inlets for drilling large diameter wells with backwash 1. The disadvantage of the known drill string is the large radial dimensions of the locking part, which makes this design little suitable for drilling small wells diameter is not at all suitable for testing cased wells. Closest to the invention is a drill string, including outer and inner tubes, forming three channels, concentrically located with respect to each other a joint connecting the inner and outer pipe with transverse baffles in the annular space along their ends, and seals C2II. This drill string has small radial dimensions, however, it does not provide sufficient reliability of work, since the isolation of the drill string channels is carried out by face seals of end semirings. At the same time, it is necessary to seal the ends with the intermediate pipe, as well as the conical ends of the inner pipes, which is practically impossible or possible only as a one-time connection of sections with large preliminary fitting work. The purpose of the invention is to increase the reliability of the drill string. This goal is achieved by the fact that in a drill string, including outer and inner pipes, which form three channels, concentrically located relative to each other nodes connecting the inner and outer pipes with transverse partitions along the ends, and seals, the node of the din of the inner pipes is made in two pairs telescopically mounted nozzles, one end of which is rigidly connected to the external pipe connection unit. FIG. 1 shows a drill collar, a section (an embodiment of the internal channels in the form of a blocked pipe); in fig. 2 shows section A-A in FIG. one; in fig. 3 - drill column, incision (an embodiment of the internal channels in the form of parallel-arranged pipes); in fig. 4 is a section BB in FIG. 3. The drill string consists of external pipes 1, their connection nipple 2, and internal pipes forming three channels with external channels: internal channels Z. and 4 and external ring channel 5. Internal channels can be formed by pipe b with a partition 7 (FIG. , 1 and 2) or two rows of pipes 8 and 9 parallel to each other (fig. 3 and 4). The inner tubes have their joint assemblies made in the form of telescopically installed branch pipes 10, 11 and 12, 13, in pairs, the branch pipes 10 and 11 being rigidly connected to the nipple 2 by means of stiffeners 14, in the case of internal pipes c. a partition 7 (Fig. 1 and 2) pipe 13 can be made integral with the pipe 6 in the form of a shank. flfin ensuring reliability, the connections of the nozzles above the nipple 2 are installed with a gap of 15 relative to the inner tubes of the centering sleeve 16 with the kerchiefs 17 of stiffness. The nozzles are provided with seals 18. The internal pipe connection nodes to prevent internal fluids from moving in channels 3 and 4 have transverse partitions 19 and 20 installed along their ends. Sections of channels 3, 4 and 5 may be different depending on the purpose and conditions of use columns. The drill string works as follows. In the process of drilling or testing, the outer sections of drill pipe 1 with inner pipes rigidly fixed at one end with a partition 7 or pipes 8 and 9, parallel to the location of the ear, are expanded using nipples 2. At the same time, the ends of pipes 6 or nipple 13 are pre-inserted into connector 11 and then fasten the pipe 1 to the nipple 2. Due to the fact that the coupling 16 has an annular gap 15, the threaded connection of the outer α-pipes 1 with the nipple 2 and the telescopic connection of the pipes 10, 12 and 11, 13 is carried out independently without imposing additional links. The torque is transmitted by the outer tubes. After the drill pipe has been expanded, various agents, such as flushing fluid and compressed air, are pumped out through the channels 3 and 5 and pulp is pumped from the bottom of the drilling or the pumped out pumped liquid through the channel 4. The technical and economic efficiency of the invention is to reduce material costs, associated with the wiring and testing of exploratory wells.

qous.1

go

Jf

dzie,

Claims (1)

(5 4) of the drill string, including interior and exterior _and the pipe forming the three channels concentrically disposed relative to one another the nodes compounds inner and outer tubes with transverse partitions at the ends and the seal, characterized in that, in order to increase reliability of operation, assembly the connection of the inner pipes is made in the form of two telescopically mounted pipes in pairs, one end of which is rigidly connected to the junction of the outer pipes.