Study On Horizontal Well Production Technology For ZH39 Block

Heavy oil plays a great role in the world resources.At present,the development for reservoirs with small depth and thick pay zone is better for that with complex formation structure and thin pay zone.The application of the horizontal well improve the recovery of the heavy oil reservoir,but with time going by,some relating problems come out.It's necessary for us to make researches on the optimization of development technologies and relative parameters.To solve problems about the completion of the horizontal well,the article makes some researches on perforation distribution.With the increase of front head perforation density,the jetting length becomes longer,the dryness is lower than non-optimization but the influence on the end is little.To improve the horizontal well length and the dryness,we can increase the density of the end or decrease that of the front head.To clean the pollution around the well,nitrogen foam acidizing is better that mud-acid system.As for the selection of the development technologies,we analyze the mechanism of the viscosity reduction and the effectiveness about CO₂,composite viscosity agent and the steam.The results show that the best CO₂ injection volume is 0.2PV,composite viscosity agent can broaden the sweeping scale and be effective for low remain oil reservoir and the increasing injection of steam can greatly reduce the oil viscosity.With orthogonal experiment,we optimize the development of directional well and horizontal well especially with HDCS method.The results indicate that the best injection volume for CO₂,composite viscosity agent and the steam is 20t,50t,150t and 30t,150t,2000t.Finally,to solve the problem of large different properties from long time development,we establish the theoretical model to optimize the injection parameters and select the best parameter set for tubular column.The application demonstrates that the increasing oil is very large on the condition that the dryness is larger than 70,the velocity is9t/t,and the pressure is 19 MPa.Through the study,the essay makes sure the perforation density and HDCS production parameters.For the Ng7¹ zone,the HDCS is more proper and steam injection or DC method is better for Ng6³,Ng6⁶ and Ng7².Our research is significant for the heavy oil development and management.