Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
- flow string by 140mm diameter lower on design depth for the purpose of full
opening of productive horizons with deepening on 20m lower and their
development in stand of pipes.
There are made special demands for design of gas wells. Wells should be airtight,
durable, reliable in operation, inexpensive.
Gas condensate wells are equipped by the special underground and ground
equipment.
Purpose of the underground equipment:
- not to allow destruction of critical area of formation;
- to protect flow strings and pump-compressor pipes and other equipment from
corrosion and erosion;
- to prevent formation of hydrate blocks in a borehole;
- not to allow open well flowing by overlapping of gas stream on a bottomhole;
- to provide supplying on a bottomhole and borehole of the corrosion inhibitors and
hydrate inhibitors, and also a liquid mud during killing of well;
- to provide work on increase of wells productivity;
- to lower inundation rate and to isolate watering interlayers;
- to provide liquid and firm particles removal from the bottomhole;
- to provide possibility of carrying out research and repair works.
The land equipment is intended for:
- hermetic sealing of hole annulus of well;
- regulations and control of gas streams;
- regulations of well rate of yield and maintenance of the operation set mode;
- start-up, shutdown and killing of well;
- supply of the corrosion inhibitors and hydrate inhibitors on bottomhole and in
borehole;
- control of wellhead pressure and temperature;
- carrying out research and repair works, including works on increase of wells
productivity.
There is install the casing head ОКК-2-350-299-214-140 type on the wellhead which
binding and sealing all well strings. Wellhead is equipped with control equipment (casing
head and Christmas tree) of cross-shaped type AFK 3-65х350 for 350 atmospheres which
binding and sealing tube and tubing space of the well flow string.
Connections of assembly of control equipment are flange. The control equipment is
completed by straight-through type slide valves with consolidation “metal to metal” with
positive or automatic greasing feed.
Volume 2. Part 1. EIS Project for Surgil field construction
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