RU32595U1 - THERMO INDICATOR - Google Patents

Description

THERMO INDICATOR

The solution relates to thermometry, namely, to the field of monitoring the tonal state of the environment in conditions of difficult access to the place of control. This indicator can be most widely used in mining, construction and geological sectors, especially for determining temperatures in deep oil wells.

Oil wells are one of the most complex objects for determining temperatures. This is due to their depth, direction often drilled deviated wells, the presence of various equipment in the wells, as well as the fact that the temperature at each point in the well can change over time - increase or decrease, and when choosing equipment for the wells and diagnosing it, it is necessary to control the temperature in his location. This is due to the specific requirements of the designs of devices for determining the temperature in oil wells.

Known designs of devices for measuring temperature in hard-to-reach places, for example, in wells, including oil ones (A.S. USSR JN5 1283550, MPK4 G 01 K 13/00, "Device for measuring temperature in a well, BI No. 2, 87g. ; A.S. USSR No. 885822, IPPC

MPK7S01 K 11/06, G 01 to 07/00

G 01 to 05/32, "Depth thermometer, BI No. 44, 81; A.S. USSR No. 991190, MPKZ G 01 to 07/16, "Well thermometer, BI No. 3, 83g .; US Pat. USA No. 4349281, IPC G 01 K 01/16, publ. 09/14/80; US Pat. Great Britain No. 1121744, IPC G 01 K 07/38, publ. 1967). The listed devices are different in design and operation principle (using bimetallic plates, magnetic pairs, piezoelectric sensors, etc.). They share a common drawback, namely, the complexity of the design (signal sensor, conductive system, signal reception device) leading to a decrease in their reliability when used even for their intended purpose - in wells. In addition, the mere fact of the presence of a conductive system in the wells significantly reduces the reliability of the device in such conditions of its operation.

Temperature indicators are also known using elements made of hot-melt materials (A.S. USSR No. 861980, MPKZ G 01 K 11/06, “Temperature Indicator, BI No. 33.81; AS USSR No. 1186967, MPK4 G 01 K 11/06, “Thermal sensor, BI No. 39, 85g .; AS USSR No. 1195196, IPC4 G 01 K 11/06,“ Temperature sensor, BI No. 44, 85g; AS USSR No. 1402038, MPK6 G 01 K 11/00, 07/22 "Thermal indicator BI No. 31, 97; US Pat. No. 3633425, IPC G 01 K 11/12, publ. 11.01.72).

The disadvantage of the design of these temperature indicators is the difficulty in installation and operation, which complicates their use.

“Temperature sensor, BI No. 44, 85g. It consists of a body filled with a melting substance with a given melting temperature, and the melt must necessarily provide mutual contact between the sensor elements (until the substance has melted, there is no contact). The disadvantage of the construction of this device is its complexity and the inability to determine the temperature in conditions of difficult access to the place of determination, because it is not possible to check the position of the temperature sensor at the temperature detection point. In the vertical position of the sensor, the determination becomes impossible due to the lack of contact of the melt with the sensor elements, because the melt flows to one side.

The task is to create a design of a thermal indicator that is easy to manufacture and operate, reliable under any temperature control conditions, especially in hard-to-reach places, for example, at the depth of oil wells, and providing the necessary temperature determination accuracy.

The task is achieved by the fact that in the thermal indicator containing the body and the melting mass in it, the body has the form of a bolt, in the end of the head of which there are recesses filled with seals from the melting substance with a given melting temperature. The number of recesses is determined from the condition of maintaining the strength of the bolt head. As the material for the seals, it is preferable to choose metal alloys with different melting points for each seal. Different temperature

Zcc. melting allows you to record the temperature spread. To reduce

the probability of mechanical destruction of seals in contact with the solid elements surrounding it, the surface of the head of the bolt is ground. If the indicator is planned to be placed horizontally, it is advisable to place marks on the surface of the fillings that will disappear when the fillings melt and thus make it possible to fix the fact of its melting.

In FIG. 1 shows a side view of the thermal indicator, a pull-out, in FIG. 2 is a view of a thermal indicator with recesses from the end.

The temperature indicator comprises a housing (1) in the form of a bolt with a head (2) and thread (3) for fastening in the descent element. In the body of the head (2), recesses (4) are made in which seals (5) of a metal alloy with a given melting temperature are placed (see the reference book “Heavy non-ferrous metals and alloys. Moscow. TsNIIEItsvetmet. 1999).

The thermal indicator works as follows.

The thermal indicator (case) (1), with the threaded part (3), is fixed in the body of the (oil) device lowered into the well, for example, in the body of the hydraulic protection of the electric motor of the submersible pump, then its descent begins. As the depth of descent increases, the temperature in the well increases. If the temperature in the well is equal to the melting temperature of the seal (5), the seal will melt. First of all, the most fusible filling is melted. When melting, it flows out of the recess (4), if the indicator head (2) is on an inclined section of the descent device, or splashes out (when mounted on a horizontal section). Anyway

v ,.

4

it changes shape and in appearance differs from the surface of the end face of the bolt head (for example, a missing mark). Then, other, more refractory fillings melt. (5) the highest temperature in the well is judged when it rises to the surface of the lowered device, by changes in the most refractory seal.

This indicator was tested at the fields of OJSC Nefteyuganskneftegaz, showed sufficient accuracy in determining the temperature in the well. It is very simple to manufacture and it can be made for any tool or device lowered into the well, taking into account their design and the holes in them. Those. there is no need to destroy their integrity. In addition, it is not difficult to replace or restore a leaked seal. Selection of a filling alloy by melting temperature is also a purely engineering solution that does not require additional studies and allows expanding the range of measured temperatures to the widest limits due to the properties of these alloys. With a large number of definitions, these devices are located taking into account the depth of the well at a distance from each other along the depth of the well.

Claims (4)

1. A thermal indicator comprising a body and a mass in it melting with a predetermined melting point, characterized in that the body is in the form of a bolt, in the end of the head of which there are recesses filled with seals from the melting mass, the number of recesses being determined from the condition of maintaining the strength of the bolt head. 2. The temperature indicator according to claim 1, characterized in that metal alloys are used as the melting mass. 3. The temperature indicator according to claim 1, characterized in that the surface of the bolt head is ground. 4. The temperature indicator according to claim 1, characterized in that marks are applied to the surface of the seals.