Abstract

AbstractDue to the low permeability characteristics of tight oil reservoirs, depleted development is the main driving force of oil displacement, and the additional seepage resistance near the bottom hole after oil degassed during the production process will seriously affect the production of oil wells. Therefore, it is very important to determine the reasonable production pressure difference of tight oil Wells. In this paper, physical simulation experiment is used to study the seepage resistance law of dissolved gas flooding in rock samples with different permeability, and the chart of permeability and reasonable production pressure difference is drawn. According to the chart, the reasonable production pressure difference of the well with known reservoir permeability can be obtained. The results show that the reasonable production pressure difference of oil well is controlled by the reservoir permeability, and the lower the reservoir permeability, the higher the corresponding bottomhole flow pressure. In the scenario of the same bottom hole flow pressure, the lower the permeability is, the earlier the influence of degassing on the additional seepage resistance of the flow is, the lower the reasonable production flow pressure is, the more serious the oil degassing is. At the same time, the reduction of formation energy depends on the amount of oil and gas recovered. when the dissolved gas escaped and recovered seriously with the same reservoir pressure drop, the amount of recovered oil will decrease accordingly. It is concluded that this method solves the challenges of rational production allocation and full utilization of natural energy of formation under the existing depletion development mode of tight oil wells, enriches the rational development technical countermeasures of tight oil reservoirs, and provides technical guidance for improving the development effect of current tight oil reservoirs.KeywordsTight oil reservoirReasonable production pressure differenceSeepage experimentOil displacement mechanismBubble point pressure

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