SU829889A1 - Heat-liquid motor of deep-well device - Google Patents

Description

The drawing shows schematically teploid fluid engine of the downhole tool. The fluid-well engine of the wellbore device consists of a heating chamber 1 with a heating element 2 and a stepped actuator rod 3, a chamber 4 of a smaller diameter co-compensator, and a chamber 5 of a larger diameter compensator, through which a spring-loaded stepped rod b with a spring 7 passing into the chamber 4 smaller diameter compensator. . The actuating rod 3 is loaded with a return spring 8 and the executive body 9 of the downhole tool, for example, a clamping device. Chambers 1,4 and 5 of the engine are filled with a liquid with a large volumetric expansion coefficient and a high boiling point, for example, glycerol. The fluid-dispersed engine of the wellbore instrument operates as follows. When the device is lowered into the well due to an increase in the ambient temperature, the fluid is heated in all chambers and, taking into account the fact that the metal case of the well instrument has a high thermal conductivity and is an ideal heat sensor, at a given depth the temperature of the fluid in all chambers is the same round well fluid. Due to the increase (decrease) in the volume of fluid in chamber 5, caused by a change in the ambient temperature, the stepped rod 6 moves, which, when the above ratios between the volumes of chambers 1,4 and 5 and the diameter of the stepped rod 6, are compensated the increase in the volume of fluid in chambers 1 and 4. Thus, the fluid pressure in chamber 1 does not depend on the ambient temperature and, according to Pascal’s law, is equal to the hydrostatic pressure of the fluid column in the well, and the position of the actuating rod 3 is unchanged. . Upon reaching the test interval, to move the actuating rod 3 in a given direction (up), it is sufficient to create a difference between the temperature of the fluid in chambers 1 and 5 by turning on the heating element 2. The fluid in chamber 1 expands and forces the actuator rod 3 up. The latter acts on the actuator 9 of the downhole tool and the return spring 8. The overpressure occurring in chambers 1 and 4 when the heating element 2 is turned on, acts simultaneously on the actuating rod 3 and the stepped rod 6, trying to blow them into the well environment, but the downward movement of the stepped rod 6 is prevented until pressure in chambers 1 and 4 is reached, sufficient to overcome the resistance of the spring 8 and the force from the hydrostatic pressure of the liquid column in the well acting on the area difference of st 6-stage rod defining a maximum force developing actuating rod 3, the excess of these forces and the occurrence of an emergency is eliminated stepwise peremescheniem stem 6 downwards. After the drive reaches a predetermined stroke, the heating element 2 automatically switches to reduced power using a limit switch (not shown), kinematically connected with the actuating rod 3. To set the actuating rod 3 to reverse, it is sufficient to turn off the heating element 2. In this case, the temperatures in the chambers are equalized. 1.4 and 5 and under the action of the return spring and the hydrostatic pressure in the well, the actuating rod 3 moves to its initial position. Thus, the proposed thermal fluid engine of the downhole tool does not have valves, the reliability of which in the well conditions is not high, is simpler in design and in control compared with the known engine. With an appropriate selection of fluid filling chambers 1, 4, and 5, the operability of the teploskidnogo engine downhole tool does not depend on the ambient temperature, which can reach a significant value in the well. In addition, when the heating element 2 is turned off, the actuating rod 3 returns to the initial position automatically, which guarantees the elimination of emergency situations, possible engines with a forced return to the initial position. Formula of the Invention A heat-fluid engine of a downhole tool comprising a heating chamber in communication with a liquid expansion expansion compensator and an actuating rod, characterized in that, in order to simplify the design and increase reliability in a wide temperature range, the compensator is made in the form of chambers of larger and smaller diameters housed in them stepped spring-loaded rod mounted with the possibility of axial

movement, and the executive rod is stepped and placed in the heating chamber, and

 .

- larger camera volume

U, the diameter of the compensator;

- the volume of the heating chamber;

Vj - chamber volume of a smaller diameter of the compensator; O and d are the diameters of the stepped spring rod. Sources of information taken into account in the examination

1. Authors certificate of the USSR 285859, cl. E 21 B 47/00, 1969.

2. Authors certificate of the USSR 463780, cl. E 21 B 47/00, 1974 (prototype).

Nn s

Claims (1)

Claim A heat-liquid engine of a downhole tool containing a heating chamber in communication with a volume expansion expansion joint and an actuator rod, characterized in that, in order to simplify the design and increase reliability in a wide temperature range, the expansion joint is made in the form of larger and smaller chambers with them a stepped spring-loaded rod, mounted for axial movement, and the actuator rod is formed stepwise and placed in the heating chamber, wherein ψν ₃ wherein V, ~ of em larger diameter compensator chamber; V is the volume of the heating chamber; - the volume of the chamber is a smaller diameter of the compensator; O and d are the diameters of a step spring loaded rod.