The article proposes a method for selecting the optimal operation mode of a gas condensate well without sand accumulation in the bottom, taking into account the relaxation deformation of reservoir rocks during the development of a gas condensate deposit in the depletion mode. This method simultaneously allows you to determine the required current operating volume of produced condensate (as well as gas), as well as bottom-hole and contour values of reservoir pressure, condensate saturation and porosity of the reservoir, corresponding to the selected optimal operation mode of the well.
The article proposes a method for determining the technological regime of a well, in which it is operated without accumulation of sand in the wellbore, which is carried out of the reservoir during filtration in the reservoir of non-Newtonian oil. On the basis of the proposed method, with hypothetical data, a numerical calculation was carried out and a specific calculation example was given.
In the work, a dependence was obtained, analyzing which it is easy to see that the dimensionless parameter of sticking hazard depends very significantly on the permeability of the reservoir and increases in proportion to the increase in pressure drop, which is fully confirmed by the results of numerous experimental studies of sticking under the action of pressure drop. At the same time, one of the main, but previously not taken into account, factors that contribute to the occurrence of sticking in drilling wells is the viscosity of the formation fluid, as it decreases, the dimensionless sticking hazard parameter (i.e., the possible sticking force) in the interval of occurrence of a given permeable formation increases sharply. Indeed, the experience of drilling operations in various regions indicates that when drilling wells in gas fields, the frequency and severity of sticking is much higher than when drilling wells in oil fields, this requires special consideration in the process of drilling wells in gas fields. Keywords: sticking; drilling and casing strings; differential pressure; filter cake; viscosity; formation fluid.
The problem of determining reservoir properties (porosity, permeability) of gas layers developed in the depletion mode, whose rocks are subjected to creeping deformation with the Abel core, is considered. In order to determine the parameters that characterize reservoir properties of the reservoir, the authors indicate the possibility of using an appropriate numerical solution to the problem of determining the theoretical values of the reservoir volume-weighted average reservoir pressures over time, obtained using the finite difference method.
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