Flow Regimes are the behavior of the fluid while flowing in a well. The most common regimes are laminar, turbulent, and transitional. Unfortunately, it is impossible to define each type in the well clearly. For example, mudflow may be predominantly laminar, although the flow near the pipe waIls during pipe rotation may be turbulent. Laminar …
Why It Is Important To Understand Drilling Hydraulics? The drilling hydraulics system serves many purposes in the well. Since it is centered around the drilling mud circulating system, the purposes of mud and hydraulics are often common to each other. The hydraulics system has many effects on the well. Therefore, the reasons for giving attention …
Points to be checked before rig acceptance 1. Weld 30” riser (weld two x 3” valves on the bottom of the conductor casing to be used to take a return to the caller if required, check the conductor for any junk inside before welding. 2. Install the cellar jet and function test it (fill the …
Reaming & Backreaming Guidelines Reaming is a high risk operation that accounts for a large proportion of stuck pipe incidents. If reaming operations are conducted too fast, solids from wash-outs and cavings are introduced into the circulating system faster than the hole is being cleaned. This results in a drilling pack off. Do not assume …
Mechanical Pipe sticking is when any part from the Drill String such as Drill Pipe, Heavy Weight Drill Pipe HWDP, Drill Collars, Drilling Bit, or Bottom Hole Assembly BHA is stuck in a borehole due to mechanical reasons such as cutting accumulation, junk, extensive cement cutting and changing drill String geometry and cannot be recovered from …
Ledge in Drilling: The wellbore passes through the rock of varying types and ledges develop at the interfaces between layers of differing hardness. Closely spaced ledges decrease the effective diameter of the hole and produce a “shouldered” hole surface. Any type of casing string requires a smooth, more in-gauge hole diameter for free passage and …
Stuck Pipe In Cement Blocks Cuttings The Drill String becomes jammed in the hole by cement blocks cuttings falling around the Drill String. This mechanism occurs typically when : Hard cement becomes unstable around the casing shoe, open-hole squeeze plugs, and Sidetrack plugs. Preventative Action Rig Site Indications For Stuck-In Cement Cuttings Freeing Cement Blocks …
Collapsed Casing / Tubing Stuck Pipe Casing collapses either if pressure conditions exceed its original rated collapse pressure or the original collapse pressure rating of the casing is no longer valid due to casing wear and/or corrosion. Casing wear due to friction or corrosion decreases the effective collapse pressure rating of the casing, through decreased …
We mean by drilling junk any material, any tool or any piece of equipment may fall down from surface of from downhole Bottom Hole Assembly BHA and equipment. The junk may jams the Drill String and produce easily a good stuck. This type of stuck pipe usually occurs: Preventative Action For Wellbore Junk In Drilling …
Undergauge Hole in drilling is a phenomenon that means that the drilled hole diameter is less than the used Drilling Bit diameter. It always happens after the Drilling Bit, and the stabilizer gauges get worn while drilling abrasive rock, so the following section using the same Drilling Bit will produce a less diameter hole or …