PERFECT SHAPE OF THE HOLE

Even the most carefully designed wells will almost certainly experience problems when drilling. For example, the formations are heterogeneous,it is possible that areas using similar drilling techniques have reported drilling problems. Therefore, nearby two wells can have very different borehole conditions. In well planning, the key to successfully achieving the goals is to design your drilling program based on anticipation of potential well problems, not caution or containment.

Drilling can be very costly, the most prevalent drilling problems include pipe sticking, lost circulation, hole deviation, pipe failures, borehole instability, mud contamination, formation damage, hole cleaning, and equipment and problems. Understanding and anticipating drilling problems, understanding their causes, and planning solutions are necessary for overall-well-cost control and for successfully reaching the target zone.

The goal is to provide an efficient basis to obtain a near-gauge opening that can be maintained easily for the long term with minimal environmental impact, disturbance of the drilling objectives, and drilling costs in some oilfields, due to the high Non Productive Time (NPT),field instances of instability are a result of a combination of both chemical and mechanical factors, the former resulting from the failure of the rock around the hole due to high stresses, low rock strength, high borehole tortuosity ?or inappropriate drilling practice and the latter arising from damaging interactions between the rock, and the drilling fluid, Moreover, in these environments, high Shock and Vibration (S&V) are generated causing premature failures of the drilling rig equipment and the drill strings.

The increasing demand for wellbore stability analyses combined with DNR in the BHA design during the planning stage of a field arise from economic considerations and the increasing use of deviated, extended reach and horizontal wells, all of which are highly susceptible to the problem. Adding the DNR (DrillnReam), to the BHA assure a perfect shape of the hole which can be achieved after creating a good geomechanical model that prevents deformation of the drilled hole due to stress. This technology reduces the risk of casing breakage, damage to drill strings, reduce torque and drag, diminish downhole vibration, enhance weight and energy transfer to bit, and eliminate dedicated reamers run which can significantly reduce your nonproductive time.

A unique wellbore conditioning system, is a dual-stage, eccentric reamer.it can increases the wellbore drift as per the operator operations need, 1/16” or 1/8” over bit size while rotating during horizontal and vertical drilling operations.the main challenges in the highly deviated wells in addition to the hoop stress concentration around the borehole , the challenges are ledges, doglegs, and wellbore tortuosity, this tool can efficiently reduce all of these risks.

Four blades with numerous PDC cutters designed in a progressive pattern to minimize torque. Diamond domes are also strategically placed to eliminate pipe damage and protect the PDC cutters while rotating in casing.so you can imagine the efficiency of your mud weight window design to prevent any collapse while drilling added to the benefits of the DNR to smooth wall and eliminate the tortuosity. The resulted wall surface will be like moving in butter?:)

Proper hole geometry is a key to safe drilling, logging,completion and other production operations.?