Study On Parameter Optimization Of Double Horizontal Well In Tight Reservoir

As a kind of unconventional resource,tight oil is very rich in China.Its efficient development can partly alleviate the energy shortage in China.At present,single horizontal well and multi-branch horizontal well are two primary ways to develop tight oil reservoirs,and often combine with reservoir fracturing technology to improve oil recovery.Most researches focus on the optimization of fracturing parameters for horizontal wells.However,few studies focus on the application of dual-parallel horizontal wells in tight reservoir development and the optimization of fracturing parameters in dual-parallel horizontal wells.This paper takes W tight reservoir in Changqing oilfield as an example,and adopts dual-parallel horizontal wells as the way of production.The paper also uses numerical simulation to optimize fracturing parameters of dual parallel horizontal wells.Through the research of this thesis,the results are as follows:1)In this paper,the basic characteristics of tight oil reservoirs are researched out,then the evaluation criteria of tight oil reservoirs are systematically summarized.Furthermore,various seepage models of tight oil reservoirs are established,and the seepage characteristics of the models are analyzed.2)This paper describes the geological characteristics of W tight reservoir at first,and then select the M-section oil layer as the target formation for horizontal well development.Finally,by combining the productivity equations of ordinary horizontal wells and multi-hydraulic fracturing horizontal wells,various parameters that affect the productivity of oil wells are analyzed,and the stimulation of horizontal wells relative to vertical wells under various factors is compared.The conclusion is that horizontal wells are suitable for exploitation in M-section oil reservoirs.3)The method of orthogonal experiment range analysis is adopted,and CMG numerical simulation software is used to carry out numerical simulation research.The effects of horizontal well length,wellbore spacing,fracturing parameters and other factors on the production of dual-parallel horizontal wells are analyzed.The conclusions are as follows:firstly,reservoir parameters have the most obvious influence on horizontal well production;Secondly,among the engineering parameters,wellbore spacing is the most important factor affecting the production of dual-parallel horizontal wells,followed closely by fracture conductivity.4)The best engineering parameters for the development of dual-parallel horizontal wells in the W tight reservoir are as follows:the method of interlacing the fractures is adopted to evenly distribute;7 fractures with a length of 300m and a conductivity of 20μm~2·cm along the horizontal wellbore of 1200m,and the wellbore spacing shall be set above 400m.