Search

During the construction of oil and gas wells, due to many reasons, vibration processes occur both in the circulation system of the drilling rig and in the drill string itself. One of the most basic sources of oscillatory processes is the operation of piston drilling pumps. It is established that high-amplitude fluctuations in the drilling fluid can lead not only to vibration of the drilling tool, unstable operation of downhole motors, the decrease in penetration to the bit, but also to significant waste of energy that is not brought to the bottomhole. The results of technological studies recorded during the drilling of well No. 9401 of cluster No. 47 of the Lovinskoye field are presented, indicating a wide range of amplitude of uneven pressure of the flushing fluid of the circulation system, despite the presence of standard pneumatic compensators for drilling pumps. A device developed at the level of the invention is presented, which allows controlling vibration processes at the bottom of the well. [ABSTRACT FROM AUTHOR]

The paper presents a developed mathematical model for a radially one-dimensional problem of developing a formation with high-viscosity oil. The model is built using the technology of paired horizontal wells; a coolant flows through one of them, and the liquefied heated oil flows into the other one, which is open. It is assumed that the wells are located close enough to each other, and the heating well has been operating for a sufficient time, at which the lengths of the temperature fields are many times greater than the radius of the well and the distance between them. The heat conduction equation was solved by the method of sequential changing of stationary states. The problem was solved in two stages. At the first stage, the formation was heated without oil extraction. At the second stage, the oil was heated and withdrawn simultaneously. [ABSTRACT FROM AUTHOR]