Удп « Шуртаннефтегаз ». Comprehensive Solution for Flaring Gases Issue at the Facilities of the Unitary SC ShurtanNeftegaz. along the existing collectors. By Rakhmatilla Rajabov , Chief Expert on Technologies. УДП «Шуртаннефтегаз».
Comprehensive Solution for
Flaring Gases Issue
at the Facilities
of the Unitary SC
along the existing collectors
Chief Expert on Technologies
As known, the solution of the issue to utilize associated gases implies the concurrence of three components, i.e. environmental, economic and technological.
Unlike natural gas which consists mostly of methane, associated oil gases contain considerable part of ethane, propane, butane and other saturated hydrocarbons. Additionally there is a water vapor, nitrogen, carbon dioxide, and hydrogen sulphide. Currently oil producing enterprises have no facilities to completely utilize APG.It is caused by the absence of technologies, the introduction of which would be justified from the viewpoint of economic efficiency.
Therefore more often than not APG is flared which is accompanied by the formation of carbon black, dioxides and other combustion gases. This results in environmental pollution, excessive environmental loading on venting, and inflicts a destructive harm to human health.
This problem also exists at the oil-extracting facility of the Unitary Enterprise UDP Shurtanneftegazsituated on 19 production fields of the Kashkadarya Region. I represent that facility.
Potential ways to solve the issue of utilizing APG
In practiceAPG are utilized by using them for one’s own needs. Thus, at the Oil Treatment Plant Tashly of the Sarycha field oil gas is used as fuel gas for petroleum pre-heater. At the same time, it should be noted that the given method does not prevent flaring due to considerable volumes of oil gas. However, there are other ways to utilize oil gas which do not require significant expenditures. In March, 2009 we have accepted a most common solution to utilize petroleum gas of the Northern Shurtan field, i.e. a 12 kilometer pipeline was laid from the field to the principal facilities of the GPP, and this facilitated the utilization of up to 95% from the total volume.
Oil gas is utilized in the same way at the Shakarbulak field as well.
Diagram of oil processing at the Oil Treatment Facilityof the Northern Shurtan field
Oil extracted from wells is transported to the high pressure separator С-1. Oil gas from Northern Shurtan field under pressure of P=3.4MPa is delivered from the upper part of the separator to the SP-4 of the Oil Gas Unit-2; subsequently gas is transported along the existing collectors for further treatment and processing.
Gas to GPP
Gas to FND
Petroleum pipeline to OTP
of tube heater
Diagram of oil processing at the Oil Treatment Plant of Shakarbulak Field
Gas to GPP
Gas to FND
Petroleum pipeline to OTP of tube heater
Currently work is going on at the UCS ShurtanNeftegaz to implement the project Recovery and Utilization of APG from NorthernShurtan, Garmistan, Kumchuk, Shakarbulak Fields, and degasified gases from the Headworks.
This project stipulates construction of gathering facilities as well as booster compressor stations to compress APG and degasifying gases from the headworks of the UCS ShurtanNeftegaz for their further treatment and extraction of useful components.
It is suggested to implement the project in two stages:
APG from Northern Shurtan field will be transported by pipeline to the BCS Northern Shurtan at the Р=0.1 МPа;gas from the BCS Northern Shurtan will be delivered to the inlet of the BCS Headworks at Р=1.0 МPа.
In addition to oil gas, degasified gases from the Headworks will be delivered in three streams (at different pressures Р1=0.4 МPа; Р2=1.8 МPа; Р3=4.8 МPа) to the inlet of the BCS Headworks.
From the BCS Headworks oil gas and flash gases are transported to the UNTS of 1st and 2nd stages at P=7.5 MPa.
Description of utilization plan
While comparing cost of investment project for the prudent management of APG, which includes expenditures to build production facilities, purchase and assembly of equipment, cost of maintenance with the amounts of environmental payments and penalties imposed for flaring, it becomes evident that currently it is easier for oil company to pay penalties than to invest into a knowingly unprofitable project.
Nevertheless, taking into account the damage inflicted to the environment and human health, it is necessary to focus efforts directed to the reduction, and when possible to the elimination of flaring; and this we are hoping to achieve while actively cooperating with GGFR.
Thank you for your attention!