FUNCTIONAL REQUIREMENTS FOR STABILITY OF JACK UP DRILLING RIGS ON WORKING POSITION

Abstract

Jack up drilling platforms are offshore drilling units composed by drilling rig situated on naval structure without self propelling device. Jack up drilling rigs are units used for drilling and completion of deep well bores in offshore oil and gas exploration industry or field development. By reaching the theoretical center of gravity and equilibrium while towing and balance of acting forces on the unit while operations on location ensures the stability and safe mode of operations of entire unit. Penetration of legs spud cans in sea bad produced by weight of unit and acting of preload force, depending on geotechnical characteristics, type and bearing capacity of sea bad, and taking in consideration working environmental forces which acts on unit (wind, waves, sea current, ice, snow) ensures proper foundation, environmental forces balancing and safe mode of operations (the paper is published in Croatian).

Keywords

• jack up drilling platform
• environmental forces
• preload
• legs penetration in seabed
• friction angle
• stability moment
• safety against slippery