SU1574788A1 - Double boring pipe - Google Patents

Abstract

The invention relates to a drilling technique and is intended for the construction of wells with the continuous transportation of a slurry material. The purpose of the invention is to simplify the design. The drill pipe comprises an inner pipe 1 with connecting elements 2, an outer pipe 3 with locking elements 4 and 5 at the ends. At one end of the pipe 3 is installed with the possibility of interaction with the locking element 5 and the pipe 1 stabilizing element with centering ribs. The stabilizing element is made in the form of a split sleeve 6 with a conical outer surface. The centering ribs are integral with the body of the sleeve 6 on its inner surface. The pipe 3 has a tapered bore 11 to interact with the tapered outer surface 9 of the sleeve 6. The latter firmly compresses the pipe 1, simultaneously clamping the end part of the threaded joint of the pipe 3 and the element 5 and creating additional contact stresses in the thread. This prevents the joint from disengaging when unscrewing the drill string. 2 Il.

Description

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The invention relates to a drilling technique, namely to double-boring pipes used for the construction of wells in the continuous transportation of core mud material by a return flow of a cleaning agent.

The purpose of the invention is to simplify the design.

FIG. 1 depicts the proposed dual drill pipe; in fig. 2 is a section A-A in FIG. one.

The double drill pipe contains an inner pipe 1 with connecting elements 2, an outer pipe 3 with locking elements 4 and 5 at the ends connected to the outer pipe 3. When the locking element 5 is screwed in, its inner abutment ledge 7 causes the split sleeve b to move inward

from the tube 3 along its inner conical bore 11. At the same time, the sleeve 6 firmly presses the inner tube 1, simultaneously clamping the end part of the threaded joint of the outer tube 3 and the locking element 5 and creating additional contact stresses in the thread, which prevents the joint from disconnecting when unscrewing the drill string.

During operation, as the threads are threaded under the action of the dynamic pipes with the outer tube 3, they are threaded. At one load and torque, especially at the nominal of the ends of the outer pipe 3, rotary percussion drilling is installed using an elastic stabilizing element, by performing percussion machines, approved as a split sleeve 6 and having a sleeve 6, moving inward the conical growing ability to interact from the locking point 9 creates an additional tension element 5 through its internal stability-supporting step 7 supporting stability and with the inner pipe 1 securing the inner pipe 8, cutting its groove 8. azrezna sleeve 6 has a tapered outer surface and ~ 9 and centering rib 10, formed integrally with the hub body 6 on its inner surface. The outer tube 3 has a conical ' inner tube with connecting holes 11 for interaction with a cone, an outer tube with locks

sleeves with external surface 9 6. Centering fins 10 enter groove 8

Claims (1)

Claims Double Drill Pipe Including inner pipe 1. At the opposite end of the double drill pipe on smooth elements at the ends mounted on one of the ends of the outer pipe with the ability to interact with the locking element and the inner pipe, the elastic surface of the inner pipe 1 with a guaranteeing element with centering rebar gap is installed outside the sleeve 12, having similarly split sleeve 6, centering ribs 10 and the conical outer surface 9, which interacts with the counter conical bore 11 of the outer tube 3. When assembling a double drill pipe, a split sleeve b is installed in the annular groove 8 of the inner pipe 1, which In order to simplify the construction, the elastic stabilizing element is made in the form of a split sleeve with a conical outer surface, the centering ribs being made 35 with the sleeve body on its inner surface, and the outer pipe has a conical boring with a tapered outer surface of the sleeve. is inserted into the outer tube 3. When the locking element 5 is screwed in, its inner thrust ledge 7 causes the split sleeve b to move inside the outer pipe 3 along its inner conical bore 11. At the same time, the sleeve 6 firmly presses the inner pipe 1, simultaneously clamping the end part of the threaded connection of the outer pipe 3 and the locking element 5 and creating additional contact stresses in the thread, which prevents the connection from disengaging when unscrewing drill string. During operation, as the threads are threaded under the action of dynamic loads and torque, especially during rotary percussion drilling using percussion machines, the sleeve 6 slit, moving inside the tapered section 9, creates additional tension, which contributes maintaining the stability of fixing the inner tube, inner tube with connecting elements, outer tube with locking threads under the action of dynamic loads and torque, especially in rotary-rotary drilling using percussion machines, cleared by 6, moving inside the cone ring 9, creates additional tension g that maintains the stability of the internal pipe pipe with connecting elements, external pipe with locking Claims Double Drill Pipe Including elements at the ends mounted on one of the ends of the outer pipe with the ability to interact with the locking element and the inner pipe are elastic stabilized, characterized in that, in order to simplify the design, the elastic stabilizing element is designed as a split sleeve with a tapered outer surface, with centering ribs the body is made with the sleeve on its inner surface, and the outer pipe has a tapered bore to interact with the tapered outer surface of the sleeve.