HSE Risk Management SAGD Mining Thick Oil Well Workover Process

Shu1 super heavy oil is an important capacity building block of Liaohe oil field "Nine Five" since, Shu1 super heavy oil proven geological oil reserves of 18308 * 104 t, reserves 11847 * 104 t, 1996 by way of steam huff puff into industrial production, 2000 production scale exceeded 100 * 104 t /a, the yield is 145 * 104 t. However, with the continuous expansion of production scale, super heavy oil steam huff and puff development contradictions gradually exposed. Shu1 area already entered the oil properties stimulation, special cause yield late huff and puff decline rapidly, the decline rate of around 20%, only to part of the construction of super heavy oil production capacity to maintain the stability of.According to the SAGD criteria for screening, Shul area ultra heavy oil in Du 84 block for SAGD mining horizon are: Xing VI group, and I group and Guantao reservoir. In 2003, Liaohe Oilfield Company in Du Guantao 84 well area of reservoir and Xing VI formation in 2 test area test was carried out combined vertical and horizontal wells well pattern SAGD pilot, Guantao formation of the deployment of 4 well groups, Xing VI formation in the deployment of 4 well group,in 2006 through the acceptance of PetroChina Co. Ltd., the pilot test of success based technology, perfect matching, key technology, to drive the time is ripe,thus the super heavy oil of Liaohe Oilfield Company Shu1 area industrialization the full implementation of SAGD.Through the systematic analysis of the main hazards SAGD wells and workover operations in the main conditions and dangerous, harmful consequences;evaluation of qualitative, quantitative and scientific analysis on the natural production process hazards and accidents, forecasting its security level and estimate the dangerous source of fire, explosion or leakage accidents may cause.To evaluate the major risk, and make the cut corresponding control measures,provide a reference for production management.