Successful Hydraulic Fracturing Techniques in Shallow Unconsolidated Heavy Oil Sandstones Part 2: Multifracturing Job Performance

摘要

There is not enough experience of hydraulic fracturing on unconsolidated low-temperature shallow formations,similar to the main development site of the East Messoyakhskoye field-PK1-3,was found in Russia.Test fracturing was performed on directional and vertical wells in the pilot works in 2017 and the main conclusions were drawn: 1.Approve technological capability of hydraulic fracturing on unconsolidated and high-permeability heavy oil reservoir 2.Approve creating traditional vertical fracture by geophysical methods and by the results of production 3.Value of fracture height by different methods of mapping fracture geometry are semi-comparable,which makes it possible to estimate the averaged value of each parameter 4.Performed complex of geophysics logging allows to estimate in technological efficiency of hydraulic fracturing 5.Performed complex of laboratory studies of various chemical compound hydraulic fracturing fluids on the core material made it possible to select the optimal compound with minimal negative impact on the formation 6.Step-by-step method increase of the aggressiveness of the treatment designs allowed the accidentfree implementation of pilot works and estimate of possible aggressiveness to tip screen out(TSO)7.The productivity gains resulting from the development and operation of the wells after the fracturing allow to adapt the result to the MHF in horizontal wells with the expected productivity gain of 40% 8.Limite fracture height growth is achieved by planning the optimal injection design,but it is not always possible.If gas-oil contact is near,it is difficult to control the geometry of the fracture,which led to the limitation of replicating the fracturing in water-oil zones without gas cap.