The relevance of the study is caused by 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 characterized by the degree and nature of its opening, due to the designs of casing filters. If in the remote zone the design of the bottomhole zone has little effect on the reservoir fluid flow parameters (and it can be neglected), then hydraulic losses appear in the bottomhole zone and near the filter itself, which must be taken into account. 
Purpose: based on the results of experimental studies, propose the optimal design of the anti-sand filter. To select, it is necessary to take into account the hydraulic parameters of its operation, which can be determined taking into account the degree of filter resistance, and when setting filters in weakly cemented and loose rocks, take into account the sand-holding capacity of the filter membrane. 
Objects. Currently, various designs of sand filters are used. For example, those with round holes, slotted ones, located in horizontal or vertical planes, which length varies and can reach the dimensions of the reservoir thickness, as well as filters of a block design and filters of a design with a filtering surface made of meshes, as well as the shape and relative position of the elements of the filter shell, affecting the creation of stable bridges from large fractions of sand or gravel packing. 
Methods. Determining the generalized resistance for filters with a filtering surface of grids and block type is associated with great mathematical difficulties. This is due to the fact that a large number of parameters appear that affect the filtration capacity of the shell. When the mesh filters, depending on the type of weaving, this is the difference in the thickness of the weft and warp wires, the difference in sizes in the vertical and horizontal planes, the influence of the design of the frame, which is considered one with the mesh. With block structures – the size and uniformity of the composition of the particles, the thickness of the filter membrane, the geometry of the filtration channels, etc. Therefore, for such filters, it is more convenient to evaluate their permeability according to the Darcy formula. 
Results. The most promising designs of filters are frames with horizontal slots, which have a much lower resistance and are less affected by hole interference. It should also be noted that due to the peculiarities of the design of frame-rod filters, the duty cycle greater than in other designs, with the same minimum value of the hole size, is easily realized.