A Full Cycle Productivity Prediction Model of Fractured Horizontal#br# Well in Tight Oil Reservoirs

doi:10.11885/j.issn.1674-5086.2013.11.14.03

Abstract

Abstract:

In tight oil reservoirs，the pore throat is of nano/micro-scale，the seepage channel is narrow，and the particle size
is small. As a result，the physical characteristics of reservoirs is very poor，and the microscale effect is significant. The
percolation is strongly affected by the matrix and fracture deformation. Due to complex reservoir characteristics and percolation
mechanism，the drainage radius in the matrix is small，there isn′t natural production capacity，which makes it difficult to
effectively develop tight oil reservoir. At present，the long horizontal well drilling technology with volume hydraulic fracturing
has been widely used to realize economic and economic development of tight oil. Under this mode，the production process can
be divided into three stages：early stage，transition period，and late stage. Accordingly，the flow field of fractured horizontal well
is divided into three regions，in which flow medium，seepage mechanism，and factors affecting the productivity are different. To
be consistent with the actual production，the productivity equations of three stages were established respectively，and eventually
a full cycle productivity prediction model was established considering the whole production process. By applying the model to
practical examples，calculated values are basically similar to actual values. The results show that the model can be applied to
practical tight oil reservoirs to predict the productivity of fracturing horizontal wells and analyze the effects of some factors on
oil production，thus the results of analysis play a guiding role in the development of tight oil reservoirs.

Key words: tight oil, fractured horizontal well, productivity, threshold pressure gradient, pressure-sensitive effect

CLC Number:

TE331.1

WEI Yi1，2*, RAN Qiquan1，2, TONG Min1，2, WANG Zhiping1，2. A Full Cycle Productivity Prediction Model of Fractured Horizontal#br# Well in Tight Oil Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.11.14.03.

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