JPS59229072A - Gas compressor for well of natural gas - Google Patents

Abstract

PURPOSE:To prevent the action of a water hammer, by equipping a drain pot of large capacity to the bottom part of a suction filter device. CONSTITUTION:The mist of submergence and the accompanying submergence at the time of sudden jet from a gas well are collectively removed by a demister 22, separately stored in a drain pot 24 of large capacity and continuously discharged by a trap 25. Gas, being allowed to flow into the first stage cylinder 26, is compressed by a piston 26a and cooled by an intercooler 27 further compressed by a piston 29a in the second stage cylinder 29 through a drain separator 28, and the gas is stored in a gas tank or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor for a gas lift pump for pumping water-soluble natural gas from a natural gas well.

Traditionally, water-soluble natural gas has been extracted by separating natural gas dissolved in brine under pressure by pumping up underground bushes from wells using gas lift pumps and releasing the pressure to atmospheric pressure above ground. ing.

In order to operate the gas lift pump, collected natural gas is compressed and used, but the reality is that the compressor used is for compressing air. However, water-soluble natural gas has special properties, and if care is not taken when using the compressor, it will inevitably cause malfunction of the compressor and waste energy for compressing the gas.

That is, the water-soluble natural gas is accompanied by a fine mist of sandy shrubs, and when a gas well blows up, the above-ground separation ability is not in time, and the shrubs are entrained as they are. In Figure 1, which shows the structural system of a conventional air compressor, the brine enters from the suction side indicated by arrow A, and the shrubs cause a mallet action within the compressor, resulting in a number of cars with broken crankshafts (not shown). Occur. Furthermore, water-soluble natural gas has methane (CH,) as its main component and has a higher specific heat than air. Therefore, unless the cooling capacity of the conventional air intercooler 11 is increased by 1.5 times or more, the compressed gas cannot be cooled sufficiently, wasted energy for gas compression is consumed, and furthermore, the compression due to the rise in gas temperature increases. cause machine failure. Furthermore, the water-soluble natural scum contains around 1% carbon dioxide gas (CO2), which dissolves to form carbonic acid under conditions of coexistence with water. Metal materials are generally corroded by acids, so
The intercooler 1 generates drain by cooling.
The cooling surface 11'a of the cooler tube made of iron or the like in No. 1 is
The wall thickness is also thin and susceptible to corrosion defects due to the effects of carbonic acid.

In addition, the methane (CH,
) are explosive and dangerous.

The present invention overcomes the above-mentioned problems and provides a novel gas compressor for pumping underground shrubs from wells in which water-soluble natural gas is dissolved under pressure, producing compressed gas that operates as a gas lift pump. The purpose is to provide.

That is, in a gas compressor for pumping water-soluble natural gas, there is a suction filter device containing a demister on the gas suction side, and a relatively large-capacity drain pot is installed at the bottom of the suction filter device. A one-stage cylinder with a built-in piston, an intercooler, a nine-drain separator, and a two-stage cylinder with a built-in piston are installed downstream of the suction filter device, and a check valve or pressure regulating valve is installed between the crankcase and the suction filter device. The present compressor is configured as follows.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of a gas pressure LII machine according to the present invention will be described with reference to the drawings. FIG. 2 is a structural diagram for explaining this embodiment, and FIG. 3 is a structural diagram for explaining measures against gas leaking from the piston into the crankcase. In FIG. 2, the gas suction of the gas compressor 21 (arrow B
) side (left side in the figure) is a suction filter device 23 containing a stainless steel demister 22, a drain pot 24 at the bottom of the suction filter device 23, and a trap 2 at the bottom.
There are 5. 'Downstream of the suction filter device 23 (
On the right side in the figure, there are an intercooler 270, a drain separator 28, and a second cylinder 29, which have a first-stage cylinder 26φ and a cooling surface 27a made of alcoholic beverage material. In FIG. 3, there is a crankshaft 32 inside the crankcase 31, and the gas flows unilaterally (to the left in the figure) from the crankcase 31 to the suction side of the suction filter device 23, and vice versa between the two. A stop valve or pressure regulating valve 33 is provided.

Next, to explain its effect, as shown in FIG. The wood is collected and removed by a demister 22, and a drain pot 2 with a larger capacity than the drain pot of the air gas compressor is installed in the lower part of the suction filter device 23.
4 and are stored separately and continuously discharged through a trap 25. Next, the gas enters the first stage cylinder 26, is compressed by the piston 28a, is cooled by the intercooler 27 having sufficient cooling capacity, is further compressed by the piston 29a in the second stage cylinder 2θ via the drain separator 28, and is compressed. It is stored as a gas (the following devices are not shown) in a gas tank or the like. Furthermore, the compressed gas is sent to the bottom of the well via piping, and the bubbles of the compressed gas act as a gas slit pump to pump underground shrubs to the surface through another thick pipe connected at the bottom of the pipe. I do.

Next, to explain the effect, in FIGS. 2 and 3, the demister 22 separates the drain from the drain pot 24 with a relatively large capacity, and the trap 25 continuously discharges the drain along with brine etc. in the natural gas. By doing so, it is possible to prevent accidents such as breakage of the crankshaft 32 of the compressor 21 due to the mallet action caused by suction shrubs into the compressor. Furthermore, by separating fine sand and mist, troubles such as damage and wear of cylinder valves are prevented.

Also, the cooling surface 2 of the intercooler 27? Since the cooling capacity of a is more than 1.5 times that of the conventional air intercooler cooling surface, it is possible to compress gas with energy savings, and it also has the effect of preventing compressor failure due to a rise in waste temperature. In addition, the material of the intercooler 27 is made of corrosion-resistant material such as stainless steel, and the valve port part is preferably shaped without a drain reservoir, so that carbon dioxide (CO) in natural scum or carbonic acid generated by dissolving in water can be used. Can prevent corrosion. Furthermore, methane (C) is the main component of natural gas.
) due to the compression of the pistons 26a and 29a,
A circulation path is provided that seals the crankcase 31 so that even if it leaks into the crankcase 31, it does not leak outside, and returns it to the suction side of the suction filter device 23 via the check valve or pressure regulating valve 33. Therefore, methane (CH,)
It also has the effect of preventing explosion accidents due to leakage to the outside and promoting effective use of resources.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a conventional gas compressor. FIG. 2 is a structural diagram of an embodiment of the present invention. FIG. 3 is a structural diagram for leakage gas countermeasures in this embodiment. 21... Gas compressor, 22... Demister-123.
...Suction filter device, 24...Drain pot, 2
6a... 1st stage compression screw), 27... Intercooler 29a... 2nd stage compression piston, 31...
Crank case, 33... Check valve or pressure regulating valve. Patent applicant Mitsui Toatsu Chemical Co., Ltd. Kaji Iron Works Co., Ltd.

Claims (1)

[Claims] In a gas compressor for pumping water-soluble natural gas, a demister for removing mist is provided in the suction filter device, and a relatively large-capacity drain bot for removing drain is provided in the lower part of the suction filter device. It has an intercooler made of corrosion-resistant material that has a larger cooling capacity than the air compressor of A gas compressor for a natural gas well, characterized in that the gas compressor is equipped with a check valve or a pressure regulating valve.