Fundamentals of organizing a hydraulic well cleaning system

A. Pavlychenko1, A. Ihnatov1, Ye. Koroviaka1, S. Bartashevskyi1, I. Korotka2, M. Mekshun1

1Dnipro University of Technology, Dnipro, Ukraine

2Naftorynok LLC, Kyiv, Ukraine

Coll.res.pap.nat.min.univ. 2021, 67:136-152


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Purpose. Substantiation of the parameters of a progressive complex hydraulic program for cleaning the bottomhole and the wellbore under construction, based on methods for studying the physical and chemical interaction of drilling fluid (gas-liquid mixture) with rock mass destruction products.

Research methodology. Analytical and laboratory studies of the features of the creation and implementation of a progressive integrated hydraulic program for cleaning the bottomhole and the wellbore of a well under construction were carried out using modern methods of analytical analysis and experimental research, in particular by using the general principles of mathematical and physical modeling, methods for processing research results in the EXCEL, MATHCAD, measuring instruments and materials. The flow of drilling circulation processes was modeled on experimental wells of the training drilling site of the Dnipro University of Technology using the UKB-4P drilling rig and the corresponding auxiliary tools and equipment.

Research results. The key issues of improving the method of drilling with the use of cleaning agents of normal and low density are considered. The features of physico-chemical interactions at the phase boundary in the system “cleaning agent - rock” are studied. Basic information on the main design and technological features of individual nodes in the chain for obtaining low-density cleaning agents is given. The need for a thorough approach to the process of regulating the pH level of cleaning agents based on the geological and technical conditions of drilling operations and the purpose of the wells has been convincingly proven. The flushing liquid treated with direct electric current and having acquired certain values of the pH value can be used to improve the technical and economic indicators of well drilling.

Originality. The maximum efficiency of surfactants, as an indispensable component of the drilling fluid (gas-liquid mixture), is determined by the activity of their polar molecules, and the introduction of surfactants into the composition of the drilling fluid provides a significant reduction in energy costs for the implementation of a perfect well construction process.

Practical implications. Logically and sequentially, the issues of the influence of the parameters of the cleaning agent on the downhole processes of rock destruction are considered; the relationship between the physical and geometric characteristics of the destruction products and circulation processes at the bottom and in the wellbore; features of the circulation scheme of the cleaning agent associated with a variety of geological and technical factors.

Keywords: drilling fluid, well construction, surfactant, rock, destruction products, cuttings, hydraulic cleaning program, cavitation, activated fluid, device.


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