| The actual field practice shows that the volume fracturing technique is the most effective method for tight reservoir stimulation.After multi-stage multi-cluster fracturing,horizontal wells can be generated a large volume fracture network in the reservoir near the well,which can effectively improve the development effect of tight reservoirs.Evaluation of effective fracture network of multi-stage fractured horizontal Wells with well test data is the foundation of scientific development of tight reservoirs.It is necessary to establish a set of unstable pressure response models and dynamic inversion technologies for multi-stage fractured horizontal wells in tight reservoirs,so as to provide technical support for inversion of fracture parameters and evaluation of fracturing effects.First of all,it conducted an in-depth investigation on the research status of the multi-stage fracturing horizontal well test analysis model,the flow process of the multistage fracturing horizontal well,the pressure characteristic curve,and the pressure dynamic inversion method in the tight oil reservoir at home and abroad.Based on mechanics of flow through porous media theory,modern well test interpretation technology,reservoir engineering analysis method,Considering the complex flow through porous media characteristics of tight oil and the shape of fracturing network,a well test analysis method for multi-stage fracturing horizontal wells in tight oil reservoirs was established.At the same time,the application research was carried out using the test data of a tight oil reservoir in Xinjiang Oilfield as an example,and the following results were achieved:(1)Based on the selected trilinear flow model and SRV model,the theoretical characteristic curve of the model is obtained.Through the sensitivity analysis of the theoretical characteristic curve,the main control factors of the pressure response characteristic curve of the multi-stage fracturing horizontal well are obtained,which provides a theoretical basis for the parameter inversion of the multi-stage fracturing horizontal well.(2)A set of interpretation methods for transient well test data of multi-stage fracturing horizontal wells in tight oil reservoirs has been established.The actual test data of a tight oil reservoir in Xinjiang proves the practicability and reliability of the dynamic inversion technology proposed in this paper.It provides a reference for the fracturing evaluation,dynamic monitoring and enhanced recovery of multi-stage fracturing horizontal wells in tight reservoirs.(3)Using the pressure response interpretation results,an optimization method for the fracturing construction process was proposed to optimize the reasonable well spacing and cluster spacing of the multi-stage fracturing horizontal wells in a tight reservoir in Xinjiang.A set of methods for determining the shut in time based on the pressure wave propagation range is proposed to optimize the reasonable borehole time after fracturing in a tight reservoir in Xinjiang. |
