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1

Emission of pollutants into the air during exploration of coalbed methane

Łukańko Ł., Macuda J.

AGH Drilling, Oil, Gas

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2018

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Vol. 35, no. 1

69--82

EN

Coalbed methane is usually utilized by gas well drilled from the surface. In order to increase the coefficient of methane exploration from coal seams, in a horizontal section of the well, hydraulic fracturing operations are applied. Drilling process and hydraulic fracturing operations involve emission of pollutants to the air from the fuel combustion process. In the case of drilling operations fuel is used to generate electric power, which drives the drilling device and its components, while during hydraulic fracturing to drive high-pressure pump engines.

2

Burr Dimension Analysis on Various Materials for Convenantionally and CNC Drilled Holes

Kumar B. S., Vijayan V., Baskar N.

Mechanics and Mechanical Engineering

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2016

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Vol. 20, nr 3

347--354

EN

This work reveals the burr dimensions at entry and exit of the drilled holes on copper, brass and stainless steel. Furthermore, the effect of spindle speed and feed rate on the burr dimensions are considered and reported. Burr size minimization is one of the key problems in drilling operation. The main aim of this research is evaluated the burr dimesion occurrences of drilling on conventionally drilled holes and CNC drilled holes. The burrs produced by conventional machine and CNC machine were compared and presented.

3

The influence of prospecting unconventional hydrocarbon reservoirs on acoustic climate

Łukańko Ł., Macuda J.

AGH Drilling, Oil, Gas

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2016

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Vol. 33, no. 4

747--755

EN

In Poland the perspective shale gas formations concentrate in the area of the Baltic Basin, Podlasie Depression and Lublin Basin. Their depth varies from slightly above 2,000 to 4,500 m, depending on the location. Accordingly, novel rigs of high hoisting capacity and installed power capacity of master motors have to be used for opening natural gas deposits with the use of directional wells. The operation of such systems creates an acoustic hazard for the environment, especially in the close vicinity to the rig. The results of noise analyses of a prospecting well for hydrocarbons from unconventional sources in the north of Poland performed with the use of a rig MASS 6000E are presentedin this paper. The noise analyses concentrated on the rig area among the direct noise sources and the neighborhood to show the influence of drilling operations on the acoustic environment. The obtained results revealed that the noise emission in the rig area can be limited by optimizing the localization and placement of particular objects and systems within the rig site. This also applies to the placement of the noise barriers on the border of the rig to limit the noise emission towards objects requiring protection.

4

Effects of modification of alkali activated slag cementing slurries with natural clinoptilolite

Brylicki W., Małolepszy J., Stryczek S., Wiśniowski R., Kotwica Ł.

Gospodarka Surowcami Mineralnymi

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2009

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T. 25, z. 4

61-76

EN

Alkali activated slag slurries for boreholes cementing were modified with natural zeolite - clinoptilolite. Three different activators: ordinary portland cement, soda and blended activator (cement + soda) were used. In present paper results of investigations on the influence of clinoptilolite modification of alkali activated slag slurries are described. Natural clinoptilolite was introduced to alkali activated slag pastes in quantities between 1 and 5% in respect to dry ingredients mass. Properties of pastes both in fresh and hardened state were examined. Microstructure studies were also conducted. Addition of natural clinoptilolite slightly changed the workability of slurries. It seriously influenced setting behaviour of the slurries. Details are presented in the article. Casson model was found as the best model to describe the rheological properties of fresh slurries. Clinoptilolite causes reduction in 7 days strength (except compressive strength of soda activated slurries).

PL

Alkalicznie aktywowane zaczyny do cementowania otworów wiertniczych modyfikowano dodatkiem naturalnego zeolitu klinoptilolitu. Używano 3 różnych aktywatorów: cement portlandzki CEM I, sodę techniczną oraz aktywator mieszany - CEM I + soda. Artykuł prezentuje wyniki badań wpływu dodatku klinoptilolitu na właściwości alkalicznie aktywowanych zaczynów żużlowych. Naturalny klinoptilolit był wprowadzany w ilościach pomiędzy 1 a 5% w stosunku do suchej masy spoiwa. Badano właściwości zaczynów zarówno w stanie świeżym jak i stwardniałym. Dodatek naturalnego klinoptilolitu nieznacznie zmienia urabialność zaczynów. W znacznym stopniu wpływa zaś na czasy wiązania. Szczegóły przedstawiono w artykule. Dodatkowo klinoptilolit powoduje spadek wytrzymałości po 7 dniach w zaczynach aktywowanych cementem, zaś podniesienie wytrzymałości 7-dniowej zaczynów aktywowanych sodą. Za najlepszy model reologiczny opisujący zachowanie badanych zaczynów uznano model Cassona.