INTERCASING PRESSURE CAUSES ANALYSIS ON THE EXAMPLE OF ZHANAZHOL FIELD

Abstract

In the operational reserve of gas and oil wells, formation pressure (ICP) is one of the most significant problems, since it violates the ecological balance of the field areas, leads to the loss of formation fluid and is dangerous for personnel. Despite the continuous improvement of well construction technology at many oil and gas fields, adjacent flows and fluid effects at the wellhead are still a common type of complication. Unfortunately, the majority of methods for the ICP elimination involves the injection of sealing compounds into the intercasing from the wellhead, which is an extremely inefficient technique, since it covers visible signs, but does not exclude their causes. Therefore, the study of the causes of pressure will have both academic and practical significance, since the most effective way is not to eliminate, but to prevent PMS during the construction and completion of the well. In this paper, the occurrence of pressure in the reservoir by the example of wells of the Zhanazholsky field was considered. The research of 40 wells in a given region was conducted. To determine the degree of influence of geological, technical, technological, physicochemical and mechanical factors on the occurrence of ICP, statistical and correlation analysis procedures, an analysis of the composition of the intermediate fluid, and analysis of field material were used. Based on the available results, possible methods and ways for the ICP occurrence were shown, and also principles were formulated that could be used to prevent pressure during construction of wells and further exploitation.