RU47970U1 - DRILL PIPE ELECTRIC SEPARATOR - Google Patents

Abstract

The electrical splitter is intended for use as part of a telemetry system for monitoring downhole parameters during drilling. To increase the reliability of the electric separator on the inner side of the threaded conical section of the nipple sub, a groove is made in which a L-shaped sleeve of dielectric material is installed. The joint zone of the sub is sealed on the inside with a fluoroplastic shell mounted on O-rings made of elastic material, and on the outside it is covered with a dielectric layer.

Description

The utility model relates to well drilling and can be used as part of a telemetry system for monitoring downhole parameters during drilling.

A known electrical separator, the sub of which is connected by a cylindrical threaded connection through an insulating spacer made of fiberglass on an epoxy binder (Isachenko V.Kh. Inclinometry of wells. M .: Nedra, 1987, p.126-127).

The disadvantage of the design is the ability to deploy a threaded connection, leading to the destruction of the insulating material, and, as a result, the low resource of the separator during operation.

Closest to the proposed technical solution is an electric separator containing metal sub-assemblies assembled in a single conical threaded connection with a gasket of dielectric material between the profiles of the connecting threads. The joint of the sub on the inside is sealed with a gasket of a non-conductive elastic material. The sub is coated externally and internally with dielectric material (US patent No. 2917704, CL 324-1, publ. 1960).

The known design does not provide a sufficiently reliable electrical separation of the upper and lower sub. The polymer composite material used as a dielectric has significant porosity and high moisture absorption capacity. The fiberglass shell on the inside of the separator is saturated with flushing liquid, in addition, liquid can penetrate under it due to the presence of technological defects in the fastening of the shell. When this occurs, the swelling of the seal material,

which leads to an irreversible change in the mechanical properties of the elastomer due to the weakening of intermolecular bonds. As a result, the elastic seal does not ensure the tightness of the junction of the sub on the inside.

The objective of the utility model is to increase the reliability of the electrical separator.

The solution of this technical problem is achieved by the fact that a groove is made on the inner side of the threaded conical section of the nipple sub, in which a L-shaped sleeve of dielectric material is installed, and the junction area of the sub is sealed on the inside with a fluoroplastic shell mounted on O-rings made of elastic material.

Figure 1 shows the design of the electrical separator of the drill pipe string.

The electric separator of the drill pipe string contains a coupling 1 and a nipple 2 sub, interconnected and isolated from each other by a gasket 3 of dielectric material installed between the profiles of the connecting threads. The joint of the sub on the inner side of the separator is sealed with a gasket of non-conductive elastic material 4. A groove is made on the inside of the threaded conical section of the nipple sub, in which a L-shaped sleeve 5 of dielectric material is installed. From the inside, the junction zone of the sub is covered by a fluoroplastic sheath 6 mounted on an annular seal 7 of elastic material, and on the outside by a layer of dielectric material 8.

The manufacture of the separator consists of the following sequential operations. On the inner side of the conical section of the nipple sub, a groove is made into which a L-shaped sleeve 5 is made of a dielectric material, for example polyamide. A polymer binder can be used to fix the sleeve. Then

a thread is cut into a conical section of the nipple sub and the dielectric sleeve 5. A gasket 3 of dielectric material is placed on the thread surface on the nipple and the sleeve. They turn the sub, experimentally determine the height of the sleeve 5, which provides the specified compression of the strip 4 of elastic material, and disassemble the connection. Cut off the excess sleeve. A gasket 4 of a non-conductive elastic material is placed in the coupling sub and the final folding of the sub using a polymer binder is carried out. O-rings 7 made of elastic material are installed on the inside of the separator, then fluoroplastic sheath 6. On the outside, the junction zone of the sub is covered with dielectric material 8.

Fluoroplast is a hydrophobic material, so the inner shell is not saturated with water. O-rings made of elastomer used to install the fluoroplastic shell prevent liquid from penetrating under the shell. The polyamide from which the L-shaped bushings are made, in addition to dielectric properties, has water resistance, which is very important in the conditions of operation of the electric separator.

The application of the developed technical solution increases the reliability of the electrical separation of the sub, which leads to an increase in the reliability of the electrical separator as a whole.

Claims (2)

1. An electrical separator of the drill pipe string containing metal sub-assemblies assembled in a conical threaded connection with a gasket of dielectric material between the profiles of the connecting threads, and a gasket of non-conductive elastic material mounted on the inside in the joint area of the metal sub, coated on the outside and insulating material inside, characterized in that on the inner side of the threaded conical section of the nipple sub is made a mouth in which a profiled sleeve of dielectric material is installed. 2. The electric separator of the drill pipe string according to claim 1, characterized in that on the inner side the joint zone of the sub is closed by a fluoroplastic sheath installed on the O-rings of elastic material.