RU2812990C1 - Borehole container for autonomous devices - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: used in the study of wells to measure parameters in the pipe space of the well, operation, and carrying out geological and technical measures. The device contains a rod with radial holes and connecting threads made in it. An eccentric body is fixedly mounted on the rod, made in the lower part with end protrusions that fit into reciprocal grooves made on the outer protrusion on the rod. The body is limited by a coupling and an outer protrusion on the rod; together with the rod it forms a sealed chamber for housing one or more autonomous devices. The chamber communicates with the rod cavity through radial holes on the rod.

EFFECT: additional loads on the rod are eliminated, and autonomous devices are protected from the negative effects of well fluid in the annulus and mechanical damage.

1 cl, 1 dwg

Description

The invention relates to the field of oil and gas industry and can be used in the study of wells to measure parameters in the intrapipe space of the well, operation, and carrying out geological and technical measures.

There is a known container for running instruments on a tubing string, made in the form of a cylinder with threaded connections with tubing at the ends, having inside an eccentrically located longitudinal through channel of circular cross-section and on the outer surface a longitudinal outer groove for complete placement of an autonomous geophysical instrument for simultaneous measurement of parameters in the tubular and annular spaces of the well, while, according to the invention, the groove is made blind with end walls, in the end part of the groove on both sides of the cylinder there are flats made to form walls in which holes are made for locking elements that fix one end part of the device, and in the initial part of the groove there is a through drilling in the wall of the container along the longitudinal axis of the device, through which the tip of the device with sealing elements located on the opposite end part of the device is passed and fixed from the outside, and inside the tip there are interconnected axial and radial channels for communicating the in-tube space with the sensitive element of the device (patent RU No. 2779625 C1, IPC E21B 47/017, publ. 09/12/2022).

There is a known container for running instruments on a tubing string, adopted as a prototype, in the body of which there is a hole connecting the cavity of the injection line of the tubing with a groove located on the outside of the container in which autonomous measuring instruments are installed, and the hole is made in a stepped manner , in which a ball is installed that has the ability to close the hole in the event of a liquid leakage from the cavity of the discharge line of the tubing pipes (patent RU No. 153956 U1, IPC E21B 47/01, publ. 08/10/2015)

Known containers do not allow the operation of thermobaric sensors without connecting elements, and each individual sensor requires its own standard size of connecting element. Also, these containers do not sufficiently protect the sensors from the negative effects of well fluid and mechanical damage.

The technical objective of the proposed technical solution is to increase its reliability and increase the overhaul period when operating autonomous devices for measuring physical parameters in the intra-pipe space of a well.

The technical result achieved in the proposed technical solution is:

- to ensure the protection of autonomous devices from the negative effects of well fluid in the annulus and mechanical damage due to the sealed and stationary installation of the housing relative to the rod;

- ensuring hydraulic balancing of the cavity of the rod and the chamber due to their communication through the radial holes on the rod and the absence of additional loads on the rod due to the reduced impact of pressure on the inner surface of the rod.

The specified technical result is achieved in a downhole container for autonomous devices, containing a rod with radial holes and connecting threads made in it, while an eccentric body is fixedly mounted on the rod, made in the lower part with end protrusions included in mating grooves made on the outer protrusion on rod, limited by a coupling and an outer protrusion on the rod, forming a sealed chamber with the rod, where one or more autonomous devices are located, communicating with the cavity of the rod through radial holes on the rod.

In fig. a well container for autonomous devices is shown.

The container contains a rod 1, in which radial holes 2 are made. An eccentric housing 3 is installed on the rod 1, made in the lower part with end protrusions included in the mating grooves made on the protrusion 4 in the lower part of the rod 1, which limit its rotation relative to the rod 1 In this case, the eccentric body 3 rests against the end of the protrusion 4 in the lower part of the rod 1, and is pressed from above by the coupling 5, which limits its longitudinal movements. The eccentric body 3 forms with the rod 1 a chamber 6, which communicates with the cavity of the rod 1 using radial holes 2. The chamber 6 is sealed, which is ensured by sealing elements (not shown in the figure) located on the inner surface in the upper and lower parts of the eccentric body 3, in contact with the surface of the rod 1.

The immobility of the eccentric body 3 ensures the tightness of the chamber 6, since there is no wear of the sealing elements (not shown in the figure), while the communication of the chamber 6 with the cavity of the rod 1 contributes to the hydraulic balancing of the cavity of the rod 1 and chamber 6, as a result of which there are no additional loads on the walls of the rod 1. Autonomous devices placed in chamber 6 are reliably protected from the negative effects of well fluid in the annulus and mechanical damage.

The use of a downhole container for autonomous devices is given below.

A string of tubing pipes (tubing), together with an installed container and 6 autonomous instruments placed in a chamber, is lowered into the well to a given depth; when pumping liquid through the intrapipe space through a radial hole 2, the cavity of the rod 1 communicates with a sealed chamber 6, where thermobaric pressure is measured parameters of the in-line space using autonomous devices, and there is no need to install additional connecting elements.

Thus, the proposed technical solution allows us to avoid additional loads on the rod and provide protection for autonomous devices from the negative effects of well fluid in the annulus and mechanical damage.

Claims (1)

A well container for self-contained devices, containing a rod with radial holes and connecting threads made in it, characterized in that an eccentric body is fixedly mounted on the rod, made in the lower part with end protrusions included in reciprocal grooves made on the outer protrusion on the rod, limited a coupling and an outer protrusion on the rod, forming with the rod a sealed chamber for placing one or more autonomous devices, communicating with the cavity of the rod through radial holes on the rod.