Mud pits

Application of Corrosion Inhibitors. There are basically two main techniques used to apply corrosion inhibitors in drilling operations. In the first method inhibitors are added to the drilling fluid system either by mixing the additives through the rig s chemical hopper or through additions into the mud pit. The treatment can be achieved in two ways, batch treatment or continuous treatment. In some cases it may be necessary to use both types of treatment simultaneously. The second technique of applying is directly coating the corrosion inhibitors on the drillpipe. 

Mud Drilling. The conventional drillsite includes mud pits, mud cleaning equipment, water storage, mud storage, pumps and mixing facilities. Often the reserve pit associated with the conventional mud system is as large as the leveled... 

Rig Practice. All drilling fluids should be contained in the mud pits or reserve pit. The cellar should have a conduit linking it to the reserve pit such that accumulation of mud from connections does not spread over the location. In the case of toxic mud, a bell should be located beneath the rotary table to direct such fluids back into the drilling nipple or into the mud pit in the case of a rotating head. The use of a mud bucket is also recommended in situations where the pipe can not be shook dry. 

Drilling, wireline and workover rigs (including the mud pits)... 

Unlike the freshwater biota, POPs in local marine fish and shellfish were relatively well studied. Data were retrieved primarily from two toxic substances consultancy studies (EPD, 2003a,b), the EPD ad hoc baseline survey (EPD, 2003c), and the 2004 CEDD Environmental Monitoring and Audit for Contaminated Mud Pit IV at East Sha Chau (CEDD,... 

CEDD, 2005. Environmental monitoring and audit for contaminated mud pit IV at east of Sha Chau (2000-2005). Agreement No. CE 64/99, Civil Engineering and Development Department, Hong Kong SAR Government. 

JetJel . [Rhone-POulenc/Peif. Resins Coatings] Flocculant for settling and clarifying reserve mud pits. 

Defoamers, such as those listed above, are typically introduced into the drilling fluid system upon return of the fluid to the surface. This can be accomplished by direct injection in the blooie (return) line, surface application in mud pits or by direct injection into closed loop separators. 

Recyclable Foam System Operation. As previously stated, a recyclable foam system can be adapted to function in almost any conventional mud pit system. In a system that functions by changing the pH of the drilling fluid, the selection of the acid and base to be used determines the salt created by the acid—base neutralization. Examples of this salt formation are as follows ... 

Prior to beginning the project, a major issue to be addressed was the need for a recyclable surfactant, which would perform satisfactorily in the presence of a high hydrocarbon influx. A formulation was developed to withstand up to 50% oil influx by weight of the injected foam solution. This was accomplished through the use of oil tolerant amphoteric surfactants. Figure 6 depicts the surface handling facility and mud pit configuration used on this project. 

Mud tanks, often called mud pits, store drilling fluid until it is required down the wellbore. 

Circulation system—pipes, valves, pumps, mud-return line, shale shaker, shale slide, mud mixing hopper, mud pits, reserve pit... 

Thousands of oil and gas workers are exposed each working day to possible death or injury in what are referred to as confined spaces. Workers are often required to enter confined spaces such as petroleum and other storage tanks, mud pits, reserve pits and other excavated areas, sand storage containers, and other confined spaces around a wellhead. Safety hazards associated with confined space include ignition of flammable vapors or gases. Health hazards include asphyxiation and exposure to hazardous chemicals. 

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