The drilling program is the engineering design for the process of drilling and completion of the wellbore. The plan includes many data including well trajectory, casing design, mud program, well control, Drilling Bit Selection, geological data, formation gradient estimations, economics, and special procedures that shall be followed during the construction of the well. Although drilling …
The Variable Density – VDL Log in essence is a further refinement of the conventional CBL (Cement Bond Log) by including a full waveform display, presented on the log as ‘a variable intensity’ in shades between black and white, representing maximum and minimum in amplitudes. It is used mainly in the interpretation of the cement-to-formation …
The Cement evaluation tool (CET) uses ultrasonic acoustic pulses from a rotating transducer and measures radially instead of axially. The transmitter emits ultrasonic pulses between 200 and 700 kHz and measures the received ultrasonic waveforms reflected from the internal and external casing interfaces. The rate of decay of the waveforms received indicates the quality of …
Prior to cementing in drilling oil & gas job, laboratory testing must be carried out to ensure that the correct recipe is used considering all of the existing conditions and cementing additive properties (oil well cement properties) according to API Recommended Practise. Testing must be conducted on the actual on-site material to be used. The …
Coiled Tubing Drilling (CTD) has evolved rapidly since its first operations in 1992. The main motivation for drilling with coiled tubing was the presence of large diameter CT which makes it easy to deliver the required hydraulic horsepower to the downhole. This horsepower is mandatory for hole cleaning, transferring cuttings in the annulus, and providing …
This article covers all formulas that are used while well control situations on the drilling rig ( Check also: Drilling rigs Types). Pressures Formulas HYDROSTATIC PRESSURE (all depths TVD): Constants: PRESSURE, psi = Mud Weight x Constant x Depth, (TVD) PRESSURE GRADIENT, psi/ft = Mud Weight x Constant OR = Pressure, psi ÷TVD, ft MUD …
Well cementing plays a very important role in the construction, completion, and abandonment of wells since the cement performs vital functions in supporting the casing and drilling wellhead equipment. The casing cannot perform the functions it is designed for, described elsewhere unless effectively cemented in place. The cement forms an impermeable barrier to the passage …
The complete removal of the mud from the annulus (Mud Conditioning Simple Guide For Better Cementing) and its replacement with a good cement slurry is the major requirement for a good cement job. Cement placement is influenced by: Good cement placement can only be achieved when all parameters are optimally fulfilled. Single Stage Cement Jobs …
The cement evaluation is necessary for determining the zonal isolation and the top of cement. The position of the top of cement can be established in three ways: Comparison of the actual TOC with the intended TOC may give an indication that losses (Check also Mud Losses) (unexpectedly low TOC) or channeling (unexpectedly high TOC) …
Casing Tallies Versus Liner Tallies There are two different types of tubular tallies: 1) a casing tally spreadsheet and 2) a casing liner tally. A casing tally works from a fixed point at the wellhead (e.g. hanger landing point) and the formulae in the spreadsheet calculate the shoe depth by adding the length of each …