Method for preventing pollution of face-adjacent area of well in underground gas storage

FIELD: mining industry.

SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.

EFFECT: higher efficiency.

2 dwg, 1 tbl

 

The invention relates to underground storage of gas, in particular to methods for the prevention of pollution of bottom-hole zone of the well.

Analysis of the existing state of the art showed the following.

There is a method of creating underground gas storage (UGS)facilities, including compressor gas injection into the reservoir (see RF patent №2102301 from 29.01.96, class B 65 G 5/00, publ. in ABOUT No. 2,1998,).

The disadvantage of this method is the contamination of the well bottom zone of oil booster piston compressors, because there is no system of mechanical and chemical cleaning of the gas stream after compressor stations;

as the prototype was taken way to prevent contamination of the well bottom zone of at UGS, including kompremirovannyj gas booster compressor station to the required pressure injection, and disposal of the liquid droplet before the gas distribution substation (refer To question the quality of the gas transmission system, LLC “Kavkaztransgaz”, authors: Wemen, Ragusano and others in collected scientific articles. proceedings of SevKavNIPIgaz. - Stavropol - 2002. - vol. 36, s).

The disadvantage of this method is the absence of a specific system of purification of the gas stream, which will inevitably lead to contamination of the well bottom zone of oil booster compressors and reduce the acceleration of the latter. Explained turn will reduce the amount of injected gas and will affect the supply of off-spec gas to the consumer.

The technical result that can be obtained by carrying out the present invention, is as follows:

- eliminates contamination of the well bottom zone of UGS compressor oil;

- increased injection capacity of the well UGS;

- increases the efficiency of the reservoir in the selection process gas;

- eliminate substandard delivery of gas to the consumer.

The technical result is achieved by using a known method, including kompremirovannyj gas booster compressor station to the required pressure injection, and disposal of the liquid droplet containing drops of compressor oil and gas, before the gas distribution substation with subsequent injection of gas into the well. While the novelty of the proposed method lies in the implementation of the recycling of the liquid droplet in compressor oil using cylindrical cyclone separator of the centrifugal type and block deep chemical treatment in the form of two adsorbers operating alternately as replacement of spent adsorbent, which are mounted in parallel on the tank compressor oil.

The gas stream from the gas fields under its own pressure enters into the pipeline and forth in a linear compressor stations and transformed to pressure UGS. On doimo the compressor station UGS gas is supplied at a pressure of 36 kg/cm 2. After raising pressure up to 105-110 kg/cm2served in a well.

Purification of a gas stream conducted at compressor stations, is insufficient, because the amount of injected gas, for example, in the North-Stavropol UGS is 3400000000 m3for 6 months. And when you consider some samblanet pipelines, it is quite understandable significant pollution of bottom-hole zone of a number of wells.

For example, in the North-Stavropol UGS in 2000 pickup on a number of wells was several times lower than optimal (see table). In well No. 253, No. 314 per season download was downloaded over 75 million/m3gas at the optimum pick-up of the reservoir 214-215 mn/m3. The injection well No. 174 generally equal to 0.

This situation occurs in other UGS country.

In more detail the nature of the proposed technical solution is illustrated by the following example.

Proposed disposal of compressor oil from the flow of injected gas into the borehole storage is carried out according to the following schema:

see figure 1, which depicts a General view of technological equipment, its location according to the claimed technology, and see also figure 2, which presents technological equipment - top view.

The process equipment consists of a cylindrical cyclone separator centralino the type 1, manufactured by the factory “Volgogradneftemash” with the basic technical characteristics:

the diameter, Dn- 2000 mm

working pressure Pslave110 kg/cm2,

the gas flow rate, Q - 73000 m3/PM

To cylindrical cyclone separator 1 parallel connected two adsorber 2, 3, manufactured by the factory “Volgogradneftemash” with the basic technical characteristics:

the diameter, Dn- 2000 mm

the filtration area of the adsorber, Sf- 11 m2.

The separator of the centrifugal type adsorbers 1 and 2, 3 are mounted on the tank compressor oil 4. The purified gas is fed to the gas distribution substation 5, where he served in the hole 6.

After the booster compressor station gas enters the separator of the centrifugal type 1. It is designed for the separation of the incoming gas-liquid flow from drops of compressor oil. To ensure effective separation and uniform distribution of the gas flow over the cross section of the separator 1 is applied tangential input stream, which under the action of centrifugal force of the gas stream is directed towards the wall of the separator, the oil drops flow down and down in the tank with compressor oil 4 and the purified gas is withdrawn and sent to the block deep chemical cleaning. Vertical is operator has an undeniable advantage over other types of separators, because he has a good outflow and is easily cleaned in the tank 4, on which it is mounted.

The adsorbers 2, 3 are variable as replacement of spent adsorbents. The gas from the cyclone separator 1 with open valves 7 and 8 and the closed valves 9 and 10 are fed to the adsorber 2. When the triggering condition of the adsorbent in the adsorber 2 gas at open gate valves 9 and 10 and closed 7, 8 fed to the adsorber 3. As adsorbents, placed in collets of both adsorbers, use activated charcoal brand BAU-a PCO 21 6239 01 00 with a broad absorption spectrum, as well as zeolite or other molecular sieve. The adsorbents have a broad spectrum of absorption of mineral oils. The cleaned gas is directed to the gas distribution substation 5, where he served in the hole 6.

Based on the above not identified technical solutions, based on the signs consistent with the distinctive features of the proposed technical solution, i.e. not identified technical solutions (installation, technology), the cleaning gas is injected into wells UGS, from the compressor oil. Thus, the claimed significant signs do not follow explicitly from the parsed prior art, i.e., have an inventive step.

The inventive technology described process equipment is expected to be introduced in the region of the Rho-Stavropol UGS in 2004 2005, with projected increase in intake capacity of UGS wells and oil recovery (EOR) in the selection process gas ~ 15-20%.

The way to prevent contamination of the well bottom zone of underground gas storage are presented in the table.

Table
No. SLE.In what year wasLowering the pickup SLE. (million/m3)After purging (million/m3)UGS
12345
1742000About136North Stavropol UGS
253200075214North Stavropol UGS
314200075215North Stavropol UGS
307200060285North Stavropol UGS
225200079190North Stavropol UGS
349200018167North Stavropol UGS
350200036 138North Stavropol UGS

The way to prevent contamination of the well bottom zone of underground gas storage, including kompremirovannyj gas booster compressor station to the required pressure injection, and disposal of the liquid droplet containing drops of compressor oil and gas, before the gas distribution substation with subsequent injection of gas into the borehole, characterized in that the recycling of the liquid droplet is carried out using cylindrical cyclone separator of the centrifugal type and block deep chemical treatment in the form of two parallel installed adsorbers operating alternately as replacement of spent adsorbents, with the separator and two adsorber installed on the tank compressor oil.



 

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