Analysis of the Causes and Treatment Measures of Sand Production in Tight Oil Wells

The A reservoir is a tight reservoir with low porosity and low permeability, and natural fractures are not developed, so it is necessary to add proppant to form oil and gas flow channels after large-scale fracture network fracturing to improve the permeability of formation, so as to obtain production, it also faces the problem of sand production. According to the production situation, 28 Wells with inconsistent performance were selected for sand flushing. After sand flushing, the output of 14 Wells increased, the output of 7 Wells did not meet the expectation, and 7 Wells did not produce sand. From the perspective of sand column height classification of vertical Wells, the higher the sand column, the better the effect of sand washing and oil increase. For sand production wells, it is considered that when crude oil carries sand and rises in the wellbore, its flowability becomes poor as the temperature falling, the sand column is gradually accumulated, blocking the wellbore, and the effect of sand washing is good. The sand surface is concentrated at the bottom of the well, without causing blockage to the wellbore, and has little impact on the flow of crude oil. The expected effect can not be achieved after sand flushing. Through comparative analysis, it is found that the main reasons for sand production in tight oil wells are high sand addition intensity, large absolute sand addition per well, increasing proportion of silty sand proppant application, discontinuous or unstable backflow process, long braising time and poor reservoir development. This article provides specific measures and suggestions for optimizing fracturing parameters, post fracturing diffusion time, blowout system, and sand control and solidification measures, which have good guiding significance for sand control in subsequent oil wells and ensure the safe production and operation of oil wells.