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Drilling Engineering
Published in Nwanosike-Warren Quinta, Oil and Gas Engineering for Non-Engineers, 2022
There are several costs associated with drilling a well. Costs can vary depending on various factors including the depth of the reservoir, the rock types being drilled through, the fluid types, or the type of well that is being drilled, i.e., vertical, horizontal. The drilling engineer gets this information from the reservoir engineer and designs a drill job, then shares the cost with the reservoir engineer. The costs can include the daily cost of the drilling rig, materials including chemicals, drilling mud and water, casing, cement, fuel costs, and logging.
Mini pile underpinning
Published in A. M. Sowden, The Maintenance of Brick and Stone Masonry Structures, 2020
The drilling equipment comprises a drilling rig, a high pressure water or mud pump and a drill string. The drilling rigs may be electrically, hydraulically or pneumatically operated and may be rotary or rotary-percussive. Most contractors use commercially manufactured machines made by companies including Wirth, Hands-England, Craelius and Klemm, but some larger contractors manufacture their own specially designed rigs. Drilling rigs vary considerably in shape and size to meet the wide range of situations encountered when underpinning. They may be skid mounted, track mounted (Fig. 17.4), lorry mounted or even mounted remotely from the power pack to facilitate easier handling in very restricted working areas.
Site Investigations
Published in Benjamin Alter, Environmental Consulting Fundamentals, 2019
For boreholes that must penetrate more than a few feet of soil, a drilling rig is used. Drilling rigs come in three varieties: the rotary drilling rig, the direct push drilling rig, and most recently, the sonic drilling rig.
Application of load transfer method for bored pile in loess area
Published in European Journal of Environmental and Civil Engineering, 2022
Zhijun Zhou, Zhipeng Zhang, Chaoran Chen, Fu Xu, Tianyu Xu, Linxuan Zhu, Tong Liu
During the construction of test pile, the rotary drilling rig applies pressure by hydraulic pressure and uses the engine to drive the drill bit, which continuously spins in and cuts the soil. The soil to be cut is screwed into the bucket and lifted to the outside of the hole by the lifting device to unload the soil. In the construction process of ordinary cast-in-place pile, slurry is needed to protect the hole, which makes the mud skin formed at the contact zone of pile and soil, resulting the initial skin friction significantly lower. With the increase of time, the mud skin gradually hardens, and the skin friction increases. Similarly, sediment is easily formed at the pile tip due to slurry circulation, which makes the initial pile-tip resistance decrease. And, with the increase of time, the pile-tip resistance gradually recovers with the compaction of sediment. Since this construction method does not need slurry protection, mud skin and sediment will not be produced, and the disturbance to soil is smaller than that of impact drilling rig method. Therefore, the time-dependency of the bearing capacity of cast-in-place pile is eliminated to a great extent by this hole-forming method, and the bearing capacity of pile is improved.
Unknown Resistive Torque Estimation of a Rotary Drilling System Based on Kalman Filter
Published in IETE Journal of Research, 2022
R. Riane, M. Kidouche, R. Illoul, M. Z. Doghmane
Rotary drilling system, or more generally drilling rig, consists of three main functional equipment: the lifting, the rotation, and the pumping equipment. The classification of drilling rigs is at first approach by the maximum drilling depth capability. So, each drilling rig is designed to drill in a given depth range. Rotary drilling system is composed of different mechanical and electrical parts; the most important part of such systems is the Top Drive (Figure 1(a)). The Top Drive is a motorized injection head which, in addition to the injection of mud, ensures the rotation of the drill string (Figure 1(b)). Thus, neither the drive rod nor the rotary table is obligatory to rotate the packing; it is the Top Drive that ensures it [7].