ANALYSIS OF METHODS OF INSTALLATION OF TYPICAL TECHNOLOGICAL AND ASSEMBLY SCHEMES OF OBLIGATION OF THE MOUTH OF WELLS PSG ANTI-DISPOSAL EQUIPMENT

Abstract

Trends in the development of underground gas storage form a series of tasks ahead of science.  One of them is to reduce losses and increase storage. In order to increase the level of safety in all underground gas storage facilities of Ukraine, enterprises and organizations of Ukraine under the obligation to install anti-dumping equipment during the implementation of work on overhaul of wells at the mouth. There are three blocked circuits that are used in the territory of Ukraine.  The main elements of the equipment are installed at the mouth of the well for the entire period of repairs, and additional elements are located on the work platform in the open position and set, depending on the conditions of the work to be performed and the state of the well. Typical drainage schemes of wells of the UGS during the cattle system provide the following operations:  - sealing the mouth of the well in the presence or absence of a drill tool in it; - discharge of the well by gas release through the discharging pipeline;  - replacement of carbonated washing liquid with fresh direct flush with the necessary countermeasures;  - pumping of the washing liquid into the annulus with cement aggregates and drill pumps; - pressure control in the well with a sealed mouth;   - gas withdrawal not less than 100 m from the mouth of the well, and at high density of the location of wells on the PSG and their debits up to 100 thousand m3 / day - not less than 40 m;  - installation of additional equipment or devices for the elimination of gas manifestations and open fountains.

 In the analysis in the work, it was found that typical patterns of obstruction of the wells of PSG during repairs are established taking into account the geological and technical characteristics of the storage, depending on the relationship of reservoir and hydrostatic pressure. The main elements of the equipment are installed at the mouth of the well for the entire period of repairs, additional elements are located on the work platform in the open position and set, depending on the conditions of the work to be performed and the state of the well. For each well, the typical scheme needs to be specified, taking into account the terrain, location of lines of power grids, roads, equipment for repairing wells, auxiliary equipment and other structures and communications.