Optimal selection of sand filters for production wells on the basis of laboratory and experimental studies

Abstract

The relevance of the study is due to the need to ensure the flow of more purified reservoir fluid into the bottomhole zone of the well. When opening a formation with production wells, the design of which includes anti-sand filters, there are some imperfections that are characterized by the degree and nature of its opening and are due to the designs of casing filters. For a rational choice of an anti-sand filter in a well, it is necessary to conduct experimental bench studies, taking into account well conditions. To accomplish this task, a stand was created that allows you to: determine the amount of fluid passing through with sand; the volume and granulometric state of the sands that pass through the filters when filtering the mixed liquid; state and change in the structure of rocks in the bottomhole zone of the well; dependence of the distance between the filter elements and the production casing on the performance of the sand filter. The main component of the stand is a combined-shaped filtration tray imitating a circular reservoir model. Based on the results of experimental studies, optimal designs of anti-sand filters are proposed. To select, it is necessary to take into account the hydraulic parameters of its operation, which can be determined based on the bench tests of two types of filter elements: block and frame-rod with wire winding, both in open hole and cased hole conditions, as the most promising in terms of application. Keywords: filtration; liquid; bottomhole; zone; well; anti-sand filter.