RU1809001C - Refrigerator cellar pit - Google Patents

Abstract

Usage: in the oil and gas industry ™ in particular for equipping estuaries, oil and gas producing and exploratory wells in permafrost. Essence; the direction consists of a cold accumulator, in the housing 1 of which the inner pipe 2 with heat insulation 3 is coaxially mounted. Under the upper end cover 4 there is a heat exchanger 5 of a radiator type and a cold generator 6 with an external gas pipeline 7.

Description

Circulation pipes 8 are attached to the heat exchanger, located in the housing 1 of the cold accumulator and passed to the lower end cover 9. The lower end of the inner pipe 2 ends with a bell 10. In the upper part of the housing 1 there is an exhaust gas outlet 11 with a throttle

device 12. The lower end cover 9 is provided with holes 13 into which the lower ends of the circulation pipes are connected. The lower edge of the housing 1 of the cold accumulator is connected to the lower edge of the inner pipe 2 by a diaphragm 14 to form a cavity 15 filled with a coolant. 2 ill.

The invention relates to the oil and gas industry, namely to gas production from wells in permafrost regions.

The disadvantage of this solution is the low efficiency.

The purpose of the invention is to increase the efficiency of the direction.

The drawing shows a longitudinal section of a refrigerator mine direction.

The direction consists of a cold accumulator, in the case 1 of which the inner tube 2 with heat insulation 3 is coaxially mounted. Under the upper end cover 4 there is a heat exchanger 5 of a radiator type and a cold generator 6 with an external gas pipeline 7. Circulation tubes 8 are attached to the heat exchanger. located in the cavity of the housing 1 of the cold accumulator and passed to the lower end cover 9.

The lower end of the inner pipe 2 ends with a bell 10. In the upper part of the housing 1, an exhaust gas outlet 11 is installed with a throttle device 12. The lower end cover 9 is provided with holes 13 into which the lower ends of the circulation pipes are connected 8. The lower edge of the housing 1 of the cold accumulator connected to the bottom edge of the inner pipe 2 by a diaphragm 14 to form a cavity 15 filled with a coolant.

The direction works as follows.

Before the start of the drilling of the well, the direction is lowered into the shaft, drilled without washing with the help of a screw and put into operation. For this, the calculated amount of coolant i - low-boiling liquid (freon, propane-butane, etc.) is supplied to the cavity of the tank 15 through a special fitting on the circulation tubes 8, and the ring cavity of the cold accumulator is filled with freezing liquid (water) and the level it is brought to the bottom surface of the heat exchanger. Then, the chokes of the cold generator are opened and the cooling mode is set. The exhaust gas is removed from the cold accumulator through a conduit 11 by means of a throttling device 12 which creates a vacuum in the exhaust gas extraction region and acts as a vacuum pump. The vapors of the low boiling liquid coming here from the reservoir 15 through the circulation tubes 8 begin to condense, and this process accelerates as the cooling temperature of the heat exchanger decreases. At the same time, the degree of cooling of the condensate droplets also increases. Having cooled deeply on the heat exchanger wall and having reached gravitational maturity, a drop of condensate breaks off the nucleation points and slides along the walls of the condenser and circulation pipes into their bottom region, enters reservoir 15, which is broadcast with its mass of cold charge, which is exchanged by heat exchange with the circulation walls the tubes are transferred to a freezing fluid located in the annular space of the cold accumulator, as well as to the mountain (frozen) massif through the diaphragm 14 directly in contact with it. In the vicinity of the cold accumulator, the liquid gradually freezes and forms an ice cylinder around the wellhead, providing on the one hand a normal mode of freezing of the external surface of the cold accumulator with a frozen massif, and on the other hand, the absorption of heat from the surface of the lift column into the frozen massif (acts as a heat shield ) A lower freezing temperature of the frozen massif is created in the end region of the direction under the diaphragm 14 due to the placement here

reservoir 15, filled with a condensed and cooled working agent - a coolant that contacts the frozen massif directly through the metal wall.

Claims (1)

The formula is invented and - Refrigerator shaft direction, including an inner pipe with a bell, a cold accumulator with a cavity filled with working freezing fluid, and end caps, a heat exchanger associated with it and located in the accumulator cavity circulation pipes with a coolant, different fia2 0 the fact that. in order to increase the efficiency of the direction, it is equipped with a cold generator located concentrically to the heat exchanger, the heat exchanger is installed in the cavity of the accumulator above the level of its working freezing liquid, the lower end cover of which is made with holes in which the ends of the circulation pipes are placed, while the accumulator The cold torch has a diaphragm arranged to connect it to the bell of the inner pipe and to form a cavity filled with a coolant between them.