The Formation Damage Simulations And Protection Techniques For Wangzhuang Water Sensitive Reservoir

Nearly 40 million tons reserves in S1 of Wangzhuang, Shengli Oilfield were found in 2003, it is almost one-third of the untapped reserves at that year. However, the formation is seriously water-sensitive, this will easily result in formation damage and the energy maintainment is very difficult.The production rate is very low. The block had not been developed effectively. There is also no successful case history home and abroad on the development of such seriously water-sensitive reservoirs. Serious water-sensitivity is the key factor restricting effective development of this block. Therefore, according to characteristics and difficulties of sensitive heavy oil reservoirs, aiming at energy complement and flow conductivity improvement and based on evaluation of water sensitivity, full term formation protection technologies are optimized and researched during perforation, production operation, sand control, steam injection. High efficiency antiswelling agent SLAS-3, oil vehicle and high performance clean carrier fluid have been developed. At the same time, inclosed injection-production integration pipe string and adding chemicals through hollow rod above pump lifting technology have been optimized, and series reservoir protection technologies fitting for water sensitive heavy oil reservoirs have been developed. By means of these methods, production effect of water sensitivity heavy oil reservoirs has been improved. Water sensitivity formation protection technology and other supported engineering technologies have applied to Wangzhuang Oilfield, producing reserves of 1920×104 tons, building productivity of 46.3×104 tons and cumulative oil production is 89.6×104 tons.