Analyzing development and operation of gas and gas-condensate wells at the fields in Eastern Siberia
Practice in development and exploitation of gas and gas-condensate wells at the fields and underground gas storages of Russia evidences that performance of such a well doesn’t always reach design value. On example of the Chayanda oil-gas-condensate field test wells it is shown that in a number of cases the wells either are not developed, or their operation starts from downshifted rates. Authors recommend several new ways to raise efficacy of development of low-productive complex reservoirs. These methods will increase initial productivity of low-rate wells several times. The paper also substantiates provisions for gas rate changing depending on the amount of linear reserves and the skin-factor.Besides, it is found out that stress of rocks in a bottom-hole area increases not only with dropping of pore pressure in course of a deposit mining, but also during development, exploration and operation of wells in conditions of higher depression. The lower the bottom-hole pressure, the higher the stress in a bottom-hole area. Under the influence of the auxiliary stress the main filtering channels in the high-permeable interlayers of the bottom-hole area shrink up. The efficient porosity decreases, and saturation with the bedded liquid increases.Also, the authors substantiate a range of productivity variations for wells which need intensification of hydrocarbon inflow from a bed to acquire the designed yields