Study On Adjustment Technique Of Pressure Profile Of Wells Drilling In Daqing Oilfield

Daqing oilfield is uneven multiplayer oilfiled that developed by water flooding in the early period. Various sediment modes, sand type and uneven characteristic between plane and interlayer are based on the contradictions in the intralayers ,between the interlayers, and complicate distribution of porous pressure. In the course of water flooding for development, because of the complexity of the distribution of oil and water, and moving order, apart from the affect from the plane distribution of infilling and producing wells, the porous pressure of reservoir will be controlled by the distributing range, extending directions and difference in physics characteristic of sand body, it has the bigger differences in directional and vertical. At present, we are processing the trice adjusting well for operating the thin and piece oil layer, another side for producing the potential oil between the interlayers. The key for both sides is effective interlayers that derived from the well quality of cementing. At the present condition, the bigger annulus pressure is main geology factor that affects the quality of cementing. So the pressure profile adjustment is the most important for drilling safety and improving the quality of cementing.The purpose of our work is that get the target and technique of pressure adjustment through the analysis of formation porous pressure that affects the quality of cementing, regulation of pressure change for infilling wells, technique of pressure dropping for whole block, technique of pressure discharge for high pressure, maintaining pressure in high pressure and lower penetrability formation..Remarkable performance is that it can ensure the drilling safety , improve the cementing quality and decrease the density of drilling fluid, avoid bottom-hole incident due to high drilling fluid density, decrease the drilling cost, reduce the reservoir pollution. After success, it can apply in whole Daqing oilfield.