RU2722180C1 - Self-contained downhole device-coupling - Google Patents

Abstract

FIELD: geophysics.

SUBSTANCE: invention relates to devices for geological-field and geophysical survey of wells. Autonomous downhole device-coupling intended for recording in autonomous mode of pressure and temperature parameters, supplied along inner cavity of tubing string during production of hydraulic fracturing of the formation, development and operation of well, is made in the form of a cylindrical container consisting of one monolithic module, at that in the middle part of the device there are two independent pressure and temperature sensors, two electronic units of the signal converter and registration of parameters and two battery compartments, uniformly distributed along the radius of the housing, in housing sensors (pressure sensors) are pressed with additional fixation by nut, sealing is ensured by connection "metal-metal" and additional rubber ring, provided on the device is a protective shell, wherein on the body there are two rows of combined rubber-fluoroplastic high-tight seal at the end faces of the protective shell, casing is made of high-strength steel of strength group, providing resistance to crushing from pressure of not lower than 82 MPa, wherein outer diameter does not exceed 121 mm, and inner diameter is equal to 73.0^+0.7 mm.

EFFECT: possibility of recording current pressure and temperature parameters in non-volatile memory, with subsequent transmission of data to PC, after lifting instrument to surface.

1 cl, 2 dwg

Description

The claimed autonomous downhole device relates to devices for geological and field and geophysical research of wells.

Various autonomous downhole tools are known from the prior art, for example, from RU 38834 U1 patent (published July 10, 2004), an autonomous downhole device for conducting geophysical surveys in wells with subsequent processing of data on a computer containing an analog-to-digital converter located in a common internal sealed compartment is known , a digital control unit with flash memory, the power supply unit of the device, characterized in that in order to reduce the likelihood of depressurization of the device by reducing docking and board-to-board solder connections, the above devices are mounted on one printed circuit board.

GRANT-UFA LLC downhole containers Certificate of Conformity No.RU C-RU.MH10.B.00317 from 03/10/2015 to 09.03.2020 according to TU3666-007-82025857-2014 contain longitudinally installed stand-alone devices of the AMT-10 type with special adapters - fittings for connecting devices to the internal cavity of the container, stand-alone devices are fixed with clamps to the container, the fitting has a rubber seal with the container body.

However, the known devices have several disadvantages:

- increased outer diameter and, as a consequence, a restriction on the inner diameter of the production string;

- With a decrease in the outer diameter, a decrease in the inner, not equal passage structure;

- eccentric container design.

The objective of the claimed technical solution is to develop an autonomous downhole device that eliminates the disadvantages of the prior art and provides the ability to record the current pressure and temperature parameters in non-volatile memory, followed by data transfer to a PC, after lifting the device to the surface.

The technical result consists in ensuring the following functions:

- Record of pressure values depending on time in non-volatile memory;

- Turn on the start of recording immediately or from the set time;

- Direct measurement mode;

- Setting the interval (frequency) and recording parameters;

- Saving data in case of power failure;

- Data transfer to a personal computer.

- Ensuring unhindered passage of fluid through the internal cavity;

- Ensuring the passage of geophysical instruments and special tools in the internal cavity;

- The absence of additional loads on the tubing elevator during hoisting operations due to the reduced outer diameter and the absence of an eccentric.

The problem is solved, and the technical result is achieved through the claimed stand-alone borehole coupling device designed to record in stand-alone mode the pressure and temperature parameters supplied through the tubing internal cavity during hydraulic fracturing, development and operation of the well, made in the form of a cylindrical container, consisting of one monolithic module. The casing is designed in dimensions to ensure an equal-strength design on the tubing joints of tubing 89 mm with tensile loads, with torsional loads and with the maximum allowable differential internal pressure on the threaded joints. Connections are made according to API 5CT 3-1 / 2EU standard. At the same time, in the middle part of the device there are two independent pressure and temperature sensors, two electronic signal and parameter converter units and two battery compartments, sensors (pressure sensors) with additional nut fixing are pressed into the case, and the sealing is ensured by the metal-metal connection ”And an additional rubber ring, a protective shell is provided on the outside of the device, while on the housing there are two rows of combined rubber-fluoroplastic high-tight seals at the ends of the protective shell, the casing is made of high-alloy steel of strength group, providing resistance to collapse from pressure not lower than 82 MPa. Two independent programmable measurement channels are used to measure pressure and temperature. The casing provides protection for the electronic filling of an autonomous downhole coupling device from the effects of downhole fluid and pressure. Thereby forming a space protected from pressure and moisture in the inner cavity under the casing. A feature of an autonomous downhole coupling device, in addition to the layout of the hardware and assembly, are overall dimensions, the ratio of the outer and inner diameter. The outer diameter does not exceed 121 mm, and the inner diameter is 73.0 ^+0.7 mm, thereby providing an equal passage channel with tubing 88.9 × 7.34 mm. That allows the use of an autonomous downhole coupling device to control the pressure and temperature in the inner cavity of the tubing in production casing with an inner diameter of 125-132 mm. That is, at the wells of the old foundation, where measures are being taken to reconstruct the trunk with the help of drilling a new small-sized trunk. Also, the equal-passage channel provides unhindered pumping through the tubing and through the coupling device of any fluids and fluids with abrasives, free passage of geophysical instruments and special tools and CT rigs during the development and exploration of wells with a second (reconstructed) well. Another distinguishing feature is the possibility of compaction over the area of mounting places and the organization of additional hardware space, for example, for installing a resistivity meter - densitometer, or a separate high-speed temperature module. It is also possible to make a seal of the place to increase the power capacity, that is, to add additional batteries and increase the life of the device from 45 days to a minimum of 120 days with a recording resolution of 1 time per second, which is required for fountain type wells or gas wells during the measurements of the operating mode on different chambers for recording parameters of dynamic reservoir pressure.

The drawings show an embodiment:

FIG. 1 - coupling;

FIG. 2 is an assembly diagram when operating in a well with various equipment.

Claims (1)

An autonomous downhole coupling device designed to autonomously record the pressure and temperature parameters of the tubing supplied through the internal cavity during hydraulic fracturing, development and operation of the well, made in the form of a cylindrical container consisting of one monolithic module, with two located in the middle part of the device independent pressure and temperature sensors, two electronic signal converter and parameter registration units and two battery compartments evenly distributed along the body radius, sensors (pressure sensors) with additional nut fixing are pressed into the body, and the sealing is ensured by the metal-metal connection and an additional rubber ring, a protective shell is provided on the outside of the device, while on the case there are two rows of combined rubber-fluoroplastic high-tight seals at the ends of the protective shell, the casing is made of high-alloy steel of strength group providing the tensile shear from pressure is not lower than 82 MPa, while the outer diameter does not exceed 121 mm, and the inner diameter is 73.0 ^+0.7 mm.

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