Research On Optimization Design For Horizontal Well With Thin And Poor Formation In Aonan Oilifeld

The geological reserve is large, and its producing degree is low. Main formationis thin front layer with sand sheet deposition; the layer is thin and poor, which isreservoir with extra low abundance and low permeability. Since the low reserveabundance, low flow rate and low recovery, it’s difficult to develop the untouchedreserve effectively by conventional vertical wells under present economic andtechnical condition, whose economic performance is poor.An unit operation combined vertical well and horizontal well, which is mainlybased on horizontal wells, can solve the problems of low single well production,complex relationship between oil and water and high challenge in developmentefficiency, etc., which exposed in development on Putaohua Oil Layer of peripheraloilfield. Therefore, the research on optimization design for horizontal wells is aneffective way and the best choice to guarantee the development effect and enhance thedevelopment benefit.The article learned experience and cognition in horizontal well developmentfrom other similar reservoir, combined factors in reservoir, technique and economicaspects, deepen the geology understanding on reservoir, promote the optimization onhorizontal well area, well pattern and design parameters, and promote the productivit yprediction for horizontal wells, by ways of fine structure interpretation, reservoirseismic prediction and3D geological modeling; the article also summarize a set ofoptimization design method suitable for horizontal wells of reservoir with lowpermeability in peripheral oilfield of Daqing, and valuate the development result ofhorizontal wells comprehensively with real data in field. The result shows: theoptimization design for horizontal wells guarantees the coincidence rate of designplan for horizontal wells, the development degree of trouble reserves is improvedmuch, which bring large benefit for the oilfield.