Browsing by Subject "mud"

Now showing 1 - 3 of 3

Access status: Open Access ,
Environmental friendly drilling fluid management offshore Norway
(2014) Bilstad, Torleiv; Jensen, B.; Toft, Martin
Types and amount of fluids utilized when drilling a well determine to which extent the drilled cuttings are legally considered hazardous waste. The main categories of drilling fluids are oil based (OBM), water based (WBM) and synthetic based mud (SBM). The purpose of adding fluids to the drilling operations is to cool and lubricate the drill bit, to stabilize the well bore, to control subsurface pressure, to control formation pressure, to control well stability. to control corrosion, and to carry cuttings to the surface. Historically, cuttings from drilling sub-surface wells have been depositeddirectly from the platform to the seabed. However, environmental laws and regulations for the Norwegian offshore sector prohibit such practice when the oil on cutting exceeds 1 % by weight. Re-injection of cuttings as a slurry into subsurface formations is still practiced. Due to migration, leaks, re-entering of slurry onto the seabed, and collapsing formations this disposal method is on a decline. Transport of oily cuttings to shore for final treatment is the preferred Norwegian practice. However, cutting treatment on platforms is also continuousl yevaluated. For logistics and cost reasons, as well as health, safety and environmental (HSE) and working environment reasons, emphasis is put on offshore waste minimization, reuse and recycle.Ten onshore locations in Norway are currently receiving cuttings for further treatment and fluid recovery. The treated cuttings are for the most part disposed in landfills.
Access status: Open Access ,
Laboratory research on the influence of new BG-027 polymer addition on technological parameters of drilling mud dedicated to directional drilling in shale rocks
(2015) Wysocki, Sławomir; Wiśniowski, Rafał; Stopyra, Edyta; Romański, Michał
This paper shows the research results on the influence of new BG-027 polymer used in different concentrations onto technological properties of drilling mud for drilling in shale and clay rocks. Standard API test has been conducted as well as thermal resistance, resistance to mono- and divalent salts, LST were studied. The results show that polymer BG-027 addition gives the mud good technological parameters and is a good hydration inhibitor.
Access status: Open Access ,
Polyglycol mud for drilling in clay and shales
(2011) Gąszcz, Krzysztof; Suchar, Mariusz; Wysocki, Sławomir
Drilling a wellbore in formations containing water-sensitive shales can cause many serious technical problems. Especially mud which enable safe drilling in shales and clays formations must be characterized not only by features of standard modern mud, but also has to reduce water adsorption and thus hydration of clays and shales. This paper was prepared so as to present the results of laboratory investigation in which a glycol and ion - polymer fluid based on potassium salt was made. Obtained mud is characterized by high-temperature resistance, good rheological properties, low water loss and resistance to salt ions.