The article provides brief information about a non-standard experimental setup developed in the laboratory of St. Petersburg Mining University Well Drilling Department. technique presented makes it possible to simulate well cleaning process cuttings by incorporating variation parameters (the zenith angle well, volume flow and rheological properties agent, rotation frequency, number length drill...

Oil and gas drilling operations use drilling fluids (mud) to lubricate the drill bit and stem, transport formation cuttings to the surface, and seal off porous geologic formations. Following completion of the well, waste drilling fluid is often applied to cropland. We studied potential changes in soil compaction as indicated by cone penetration resistance, pH, electrical conductivity (EC(e)), s...

sore has appeared among the class of people (not necessarily poor) who, during a heavy rainy season, walked in mud and worked in marshy localities, barefooted. Forty-five inches of rain, mud and marshy conditions?and Naga sore were not previously known to this place. The same thing happened in Benares last summer, when heavy rainfall flooded the area, resulting in mud and marsh so that Naga sor...

Conventional Multi-User Detection (MUD) algorithms for the Multi-Input, Multi-Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system fail to consider the detection performance and algorithm complexity simultaneously. To address this problem, a new Joint Intelligent MUD (JI-MUD) algorithm that aims to improve the MUD performance of the MIMO-OFDM system and to reduce the complexity ...

Background: Drilling is one of the most widely used process in orthopaedic surgical operation and the same drill bit is used a number of times in hospitals. Using the same drill bit a several times may be the cause of osteosynthesis and osteonecrosis. Methods: In the present work, the effect of repeated orthopaedic surgical twist drill bit on the tool wear, force, torque, temperature and chip m...

Advantages  Technology allows for improved diamond deposition process, which results in stronger adhesion.  Improved adhesion of the film produces lower stresses to thereby increase the drill lifetime.  When compared to untreated drill bit, our drill bit was able to drill over 100 holes, whereas the untreated only drilled 40 holes before breaking. o Increased durability over 50% Diamond film...

A generically applicable hybrid MultiUser Detector (MUD) concept is proposed by appropriately activating different MUDs in consecutive turbo iterations based on the Mutual Information (MI) gain. It is demonstrated that the proposed hybrid MUD is capable of approaching the optimal Bayesian MUD’s performance despite its reduced complexity, which is at a modestly increased complexity in comparison...

This paper analyses the non linear properties exhibited by a drill string system under various un balanced mass conditions. The drill string is affected by continuous friction in the form of drill bit and well bore hole interactions. This paper proves the origin of limit cycling and increase of non linearity with increase in speed of the drilling in the presence of friction. The spectrum of the...

Drilling mud is a dense, viscous fluid mixture used in oil and gas drilling operations to bring rock cuttings the earth's surface from boreholes as well lubricate cool drill bit. Water-based commonly due its relatively inexpensive easy dispose of. However, several components additives muds become increasingly cautious restricted. Starch was introduced safe biodegradable additive into water-base...