[en] There are many types of ejector pellet impact drill bit providing impact rock drilling. Basic types of drill strings have been regarded, the essential requirements for the most efficient facilities to drill hard and tough rocks are formulated. With regard to these requirements, the ejector pellet impact drill bit design appropriate for operating under given conditions has been proposed

[en] Increase of petroleum recovery on Kumkol deposit will demand a lot of new drilling. The use polymer phosphates as addition agent to drilling mud and of lubricant and cooling technological facilities for metal processing will give a considerable economic effects. (author)

[en] A high-speed data link that would provide dramatically faster communication from downhole instruments to the surface and back again has the potential to revolutionize deep drilling for geothermal resources through Diagnostics-While-Drilling (DWD). Many aspects of the drilling process would significantly improve if downhole and surface data were acquired and processed in real-time at the surface, and used to guide the drilling operation. Such a closed-loop, driller-in-the-loop DWD system, would complete the loop between information and control, and greatly improve the performance of drilling systems. The main focus of this program is to demonstrate the value of real-time data for improving drilling. While high-rate transfer of down-hole data to the surface has been accomplished before, insufficient emphasis has been placed on utilization of the data to tune the drilling process to demonstrate the true merit of the concept. Consequently, there has been a lack of incentive on the part of industry to develop a simple, low-cost, effective high-speed data link. Demonstration of the benefits of DWD based on a high-speed data link will convince the drilling industry and stimulate the flow of private resources into the development of an economical high-speed data link for geothermal drilling applications. Such a downhole communication system would then make possible the development of surface data acquisition and expert systems that would greatly enhance drilling operations. Further, it would foster the development of downhole equipment that could be controlled from the surface to improve hole trajectory and drilling performance. Real-time data that would benefit drilling performance include: bit accelerations for use in controlling bit bounce and improving rock penetration rates and bit life; downhole fluid pressures for use in the management of drilling hydraulics and improved diagnosis of lost circulation and gas kicks; hole trajectory for use in reducing directional drilling costs; and downhole weight-on-bit and drilling torque for diagnosing drill bit performance. In general, any measurement that could shed light on the downhole environment would give us a better understanding of the drilling process and reduce drilling costs

[en] Shallow gas blowouts, as a general class, are the most difficult type of blowout to kill. This paper discusses current industry myths about shallow gas, typical results from a shallow gas blowout that affect the kill operation, kill options and selection criteria, rig selection criteria, and well killing guidelines. The new kill technique of vertical intervention is discussed relative to shallow gas blowouts. Also, a new technique for using horizontal wells in combination with the reservoir flood technique for killing shallow gas, cratered blowouts is explained

[en] This paper describes an apparatus for unthreading a threaded connection in a drill string. It comprises: an elongate shaft; fluid powered means for moving the shaft in repeated movement between first and second positions; upper and lower mandrels supporting the shaft and exposed to joints making up the drill string, the mandrels joining together to permit rotation therebetween; upper and lower pipe gripping means cooperatively engaging pipe joints in the drill string wherein the upper pipe gripping means engages a pipe joint above a threaded connection in the pipe string and the lower pipe gripping means engages a pipe joint below the threaded connection in the pipe string; and means coupling the shaft to impart repeated movement through the upper and lower mandrels and pipe gripping means to the pipe joints so that the threaded connection in the pipe string is rotated to unthread

[en] Stability of elastic and plastic equilibrium of deep horizontal well has been studied conformably to West Kazakhstan deposits conditions. Different forms of flat stability loss for rock ores massif are studied. This massif was weaken by deep horizontal well, on counter of this well uniformly distributed load is enclosed - pressure of drilling mortar. Linearized boundary conditions for stability are defined on the well counter and on boundary between field of elastic and inelastic deformations. The characteristic determinant is received. It is revealed, that greatest from critical pressures takes place under wave-formation by well counter equals to 1

[en] The successes and failures of the Williston Wildcatters Oil Corp., a junior oil company headquartered in Arcola, Saskatchewan were chronicled. It is located in Arcola, Saskatchewan, whereas practically all the other oil companies operate from Calgary, Alberta. Apart from location and management, (a half back female) Williston operations are also different. Unlike most junior oil companies that rely on consultants and service companies to do most of their work, Williston has re-introduced the vertical integration to the industry. By owning and operating most of the needed equipment themselves, Williston spends most of the money locally, thus helping to keep alive a small prairie town that would otherwise have had a very difficult time of it. Williston CEO Mary Tidlund and her partner, have been described by the press as ^rebels of the oil patch^, are disliked by many in the industry for their antagonistic partnering style, and failure to pay suppliers and service companies, (at least in most recent times). Initially, the company has had good success with horizontal drilling, a technology new to Saskatchewan. Williston managed to decrease the cost of a horizontal hole to roughly twice that of a vertical one (considered to be very good in view of the potential payout). However, initial successes of the company were followed with financial problems and difficulty in paying their debts. High payroll costs associated with vertical integration, and lack of focus have been cited as the main reasons for Williston's financial troubles. Although an agreement has been reached with creditors to allow the company to continue operating, there is considerable doubt that they will be able to meet scheduled loan repayment deadlines

[en] Inherent drilling characteristics of polycrystalline diamond compact (PDC) bits alone can be sufficient to excite severe torsional drillstring vibrations. The work presented in this paper augments previous findings that torsional vibrations can result from the drilling characteristics of the bit itself. Laboratory and field torsional measurements are compared with model results to show that the observed vibrations can be explained by a reduction in PDC bit torque as rotary speed increases. These torsional vibrations are important because they can cause drillpipe fatigue and may be severe enough to damage the bit. The model also is used to pinpoint possible solutions to the problem

[en] As it stands, underbalanced drilling (UBD) operation has been beneficial in the exploration of hydrocarbons and production, with advantages like faster drilling control of lost circulation, stuck pipe situations, minimal or less formation damages and an enhanced ability to expedite development of brown fields. In spite of its edge over conventional drilling, the techniques can be more complex as well. Thus, a telemetry system is required to link downhole and surface while-drilling components transmitting and providing useful information under the real-time condition to the driller during drilling operations for more precise wellbore placement to ensure maximum reservoir exposure, ultimate production increment and monitoring conditions. A novel and systematic decision support system model based on distance-based approach has been developed for performance evaluation and optimal selection of while-drilling telemetry systems for the potential development of a depleted reservoir field. The proposed methodology attests to the need for the relative importance of criteria for a given application, without which inter-criterion comparison could not be accomplished. It requires a set of model selection criteria, along with available telemetry techniques and their level of criteria for optimal selection; and it successfully presents the results in terms of a merit value which is used to rank the while-drilling telemetry systems. This aims at delivering reliable drilling performance resulting to deliverable of real-time downhole data collection and most importantly places the matured well with minimal non-productive time during UBD operations. The scientific value of this study is the development of a simplified user-friendly decision support system for telemetry systems performance evaluation and selection optimization. The proposed framework was being validated and applied to a matured reservoir for an optimum selection of telemetry techniques in the UBD operation. The result of computations displayed similar results obtained by expert judgment demonstrating the significance effect and need for telemetry systems.

[en] The reasons for occurrence of self-induced torsional vibrations of the drill pipe string were studied for choosing the efficient conditions of d at rilling and the design of the lower part of drill pipe string with the aim of reducing the dynamic load. The simulation flowchart was compiled with the help of program extension Simulink, and the problem was solved using software Matlab. (author)