Here’s my written note on Darcy’s Law for safekeeping.
Oil & Gas Notes
My notes around the oil & gas industry
The basic Darcy’s Law equation describing the laminar, creeping flow of a single phase fluid in a porous medium.
pay attention to productivity index (J(ss)) and always remember that the actual well rate is fixed by the simultaneous solution of IPR and VLP curves.
The useful application of radial flow models is obviously dependent on making a reasonable estimate (assumption) of the extent of the region around a given well over the which the flow is radially symmetric.
Basic typical well pressure control equipment
In hydrocarbon extraction, the drill stem includes the drill pipe, drill collars, bottomhole assembly and drill bit. With regards to DST, it is a procedure for testing the surrounding geological formation through the drill pipe.
This test is designed to give large-scale reservoir property trends which can give improved estimates of directional permeability and reservoir storativity. In an interference test, one well is produced and pressure is observed in a different well (or even wells)… Read More ›
In a drawdown test, a well that’s static, stable and shut-in is opened to flow. For the purposes of traditional analysis, the flow rate is supposed to be constant.
Geological formation hosting oil, gas, water and geothermal reservoirs are complex and may contain different rock types, stratigraphic (rock layer) interfaces, faults, barriers and fluid fronts. Some of these features may influence the pressure transient behavior to a measurable extent,… Read More ›
Crude oil emulsion can be encountered at many stages during hydrocarbon supply chain. Therefore, emulsion do play a significant part in the supply chain. Numerous studies have been carried out to have better understanding of these complex phenomenon. This complexity… Read More ›
Basic Well Completion Design (Wellhead & Christmas Tree) Well Completion Accessories (Typical accessories) Tubing hanger To provide a seal between tubing & wellhead To support tubing Flow coupling To protect from internal erosion caused by high velocity & turbulence flow… Read More ›
Well tests conducted at a series of different flow rates for the purpose of determining well deliverability, typically in gas wells where non-Darcy flow near the well results in a rate-dependent skin effect. Multiple-rate tests are sometimes required by regulatory bodies.
Used to measure the flowing bottom-hole pressure of a reservoir to determine its productivity index, the flowing gradient of the well fluids, possible communication between zones, and to investigate the efficiency of the gas-lift valves. The pressure survey is carried… Read More ›
PETRONAS was incorporated on 17th August 1974 The PDA 1974 places petroleum development under the portfolio of the Prime Minister PETRONAS is vested with the ownership of petroleum resources in Malaysia, with exclusive rights, powers, liberties and privileges of exploring… Read More ›
A colorless, odorless gas, Nitrogen is a non-hydrocarbon inert gas used for a variety of functions in the drilling, workover and completion phases of oil and gas wells, as well as in pigging and purging pipelines. Applications for nitrogen include… Read More ›
heavy oil is a type of crude oil characterized by an asphaltic, dense, viscous nature (similar to molasses), and its asphaltene (very large molecules incorporating roughly 90 percent of the sulfur and metals in the oil) content. also contains impurities… Read More ›
HP/HT wells were considered uneconomical, but as technologies and experiences evolve, tapping these reservoirs has become a reality.
Part of the process of preparing a well for further drilling, production and abandonment, cementing a well is the procedure of developing and pumping cement into place in a wellbore.
Core analysis is a way of measuring well conditions downhole by studying samples of reservoir rocks, core analysis gives the most accurate insight into the porosity and permeability, among other characteristics, of the well
While six may be dry holes, one in the group can make a big enough difference to outweigh all the risks.
Measurement-While-Drilling (or MWD) is a type of well logging that incorporates the measurement tools into the drillstring and provides real-time information to help with steering the drill. Once a well angle exceeds 60 degrees, the logging tools can no longer… Read More ›
Mud Logging: Started as regular record of drilling depth versus cuttings observed. Now it has evolved to incorporate various technological well logging measurements, including electric logging, SP, induction and GR. Most recently, scientists and engineers have developed Logging-While-Drilling (LWD), a… Read More ›