The results of research are related, with effective composition of process fluids for oil and gas workover.
In this article were shown research results connected with development of mathematical model of cementation in high-permeability rock at drilling and repair of oil and gas wells.
It shows the experimental results connected with creating of effective compositions of technological fluids for drilling and repair of oil and gas wells.
The results of researches of properties of the new native waterswelling polymer «Petrosorb» are given. Description is given to the design of plugging-up tool for liquidation of catastrophic absorption of flushing fluid in the course of drilling of oil and gas wells.
The study of energy balance in rock fracture is one of the directions of the scientific school of deformable solid mechanics developed for several decades at the Department of Structural Mechanics of the St. Petersburg (Leningrad) Mining Institute. The formation of this school is connected with the works of L.S. Burshtein, N.S. Bulychev, N.N. Kaidalov, A.N. Stavrogin and others. The practical results of this school are known at many sites of underground construction, in the mining industry, in exploratory drilling. Within the framework of this article, modern ideas about the mechanism of transformation of potential energy of elastic compression into dynamic types of energy during brittle fracture are briefly described, the balance of energy of this process is given, as well as examples of its use in solving a number of contact problems of exploratory drilling, least covered in the technical literature.
One of the most common types of geological complications arising when drilling wells through permafrost rocks is the violation of wellbore integrity due to changes in the natural stress state of the surrounding massif. Securing the wellbore walls with casing requires switching to a smaller drilling diameter, and the use of grouting materials for grouting fractured rocks is ineffective, since cracks are usually filled with ice, preventing the penetration of grouting material into them.
The primary results of the research and engineering work of the Department of Technology and Technique of Well Drilling, carried out and completed in 2000, are presented. The main result of drilling long wells in the ice of Antarctica is the development of the project of environmentally safe opening of the subglacial Lake Vostok, a unique natural phenomenon, the complex study of which is of the greatest interest to the world scientific community. A 505 m long well with full core recovery was drilled on the Academy of Sciences glacier (Severnaya Zemlya archipelago) in the framework of the international environmental program PEGAIS. Geophysical measurements were carried out in the well. A new method of tubeless casing and sealing of anomalous intervals using a fusible binding material and a thermal plugging penetrator was developed. Basic theoretical and technological principles of liquidation plugging of hydrogeological wells with the use of economical and environmentally safe cementing mortar based on cheap mineral waste were developed. Effectively conducted research and experimental developments on the combined heat and hydrodynamic effects on low-productive sands to increase oil and gas production wells, clarified the laws of the hydro and foam core. New applied programs for PC were formed, allowing to increase adequacy of data and to expand the field of application in evaluation of regulation and stabilization of circulation and heat exchange processes during well sinking and development.
One of the most common types of geologic complications arising during drilling for solid minerals is a breach of borehole integrity due to changes in the natural stress state of the surrounding rock massif.
Widespread introduction of SSC complexes into the practice of drilling operations allowed to significantly reduce non-productive time spent on downhole operations.
The main technological feature of operational well plugging with dry quick-setting mixtures (QSM) is the delivery of a certain amount of plugging material to a given interval, its mixing with water and processing by special plugging devices directly in the zone of geological sedimentation.
Application of so-called "dry" quick-setting mixtures (DSM) based on mineral binders as plugging material for isolation of zones of geological complications (cleaning agent absorption, water influxes and intervals of unstable rocks associated with them) required creation of a number of special devices for delivery and processing of DSM directly in the well interval to be plugged.
At geological exploration drilling for elimination of all kinds of complications is spent up to 25% of the calendar time of work of drilling rigs, and drilling productivity in some cases is halved ...
As it is known, rock loading in vertical shafts of mines, occupying 60-80% of the time of tunneling cycle, is the most labor-intensive and difficult to mechanize process. Therefore, the choice of the most rational method of rock loading is of particular importance. The main criterion for this is usually the total productivity of machines for loading, i.e. only the reduction of time for loading and the increase in sinking speed achieved due to this is taken into account. This completely misses the cost of rock loading, which has a significant impact on the cost of shaft construction.
