An efficient inversion method to interpret distributed temperature measurement of horizontal wells in shale gas reservoirs

Design and Numerical Simulation Study of a Novel AICD for Water Control and Gas Production in Gas Wells

“…However, before the implementation of water control measures, accurate water detection is the key premise. At present, advanced and efficient water detection methods for oil and gas reservoirs can determine the fluid type and interpret the liquid production profile through the distributed temperature sensing optical fiber deviation temperature measurement technology, − to realize water detection in the water coning layer/section and the high-permeability layer/section. Among them, the automatic inflow control device (AICD) for gas wells is developed on the basis of the AICD for oil wells, which can be applied to all stages of bottom water reservoir exploitation, and AICD for gas wells can balance the liquid production profile and delay gas well water breakthrough in the stage of no water breakthrough in the gas reservoir; in the early stage of water breakthrough in the gas reservoir, it can discharge less produced water to the wellbore and play the role of drainage and gas recovery; in the middle and late stages when water production begins to increase, it can control the water production in the high-water production layer/section, balance the production profile, and improve the sweep efficiency.…”

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

“…Hydraulic fracturing has been regarded as a major technique helping stimulate the oil and gas reservoirs. − During a hydraulic fracturing process, sand-carrying fluid is pumped into the well bore to propagate induced fractures in the formation. − Multistage fracturing and horizontal drilling are the major techniques applied in the stimulation of unconventional reservoirs such as tight sand and shale, which are hard to develop with economic benefits by normal ways due to the ultralow permeability and low porosity. − The engineering pattern of stage-by-stage simultaneous fracturing with multiple perforation clusters has been seen as a critical stimulation method and has been proven functioning better than that with one cluster per stage in enhancing the flow abilities of oil and gas in unconventional reservoirs. , However, there is evidence indicating an attendant problem that the profile of the inflow rates of multiple perforation clusters turns out to be nonuniform due to the poor fracture propagation uniformity, which causes the low utilization ratio of perforations and massively blocks the production potential of one fractured horizontal well. − Miller et al’s study indicates that only about 20% of the clusters contribute to the 80% of the total production by acquiring and interpreting the production logs from more than 100 horizontal shale wells in multiple basins. Coincidentally, Cipolla et al drew a similar conclusion with that above by reviewing production logs for over 100 horizontal shale-gas wells, in which less than 30% of the perforation clusters produces the most of the gas and 40% or more of the clusters are nonproductive.…”