Research On The Drilling-shut Design Of The Especially Low Permeability Oil-field

The exactly and logical design of the density of drilling liquid is the most important it safe drilling and the protection of oil/gas stratum during the adjust well drilling. During the process of the drilling liquid density design ,we found that if we take the design according to the Daqing changyuan's inter part measure of the adjust well shut drilling .On one side, the well mouth pressure cannot reach the request of drilling-shut, On the other side, it cannot represent the actual increasing of the geologic strata pressure. And the design according which the design has been made cannot satisfied the demands of safe drilling and the protection oil stratum. Therefore, in order to solve the question of actual drilling and product promised safe drilling, this text set the example of Chaoyuangou oil field, aim at the characteristics of outer circle oil field. According to Dacy radial flow theories and the improvement of practise, we found out a set of geologic strata pressure predict technology which adjudt to the density of especially low permeable oil field drilling well liquid , it is the pressure conduct empirical formula, through the adoptment of the formula, combine with structure fault, adopt move-static synthesize analysis, better to predict the layer pressure that need to be drilling increasing in a various complicated types of condition , compared to successfully solve the design problem of the outer circle oil field, obtained better economic performance in the adjustment of the drilling density ,fulfillment application of the drilling production.Drilling production practices show that the research own some characteristics . First, in the especially low permeability oil field drilling adjustment well, it is available to apply geologic strata pressure to predict technique to design the density of drilling liquid . It satisfied the demand of safe production ,at the same time ,it lower the density of drilling liquid at its best ,reduced the pollution to the layer and protected the oil/gas strata .Second, related drill-shut institution, the design well-well distance of water flooding well to be apart from in 300m must take the measure of open overflow to the pressure, the well-well distance between 300m to 600m should take the measure of stop flooding thinking from the drilling safety.