Shallow Gas Drilling Procedure

We need to study the technical and operational aspects of top-hole drilling in the planning phase of a well. This will greatly help us provide practical shallow gas procedures for that particular well. The comprehensiveness of these drilling procedures depends on the chance of encountering shallow gas. The summary of wells with a higher probability of …

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Bottom Hole Pressure In Drilling

If you’re involved in drilling operations, you know how important it is to understand the concept of “bottom hole pressure.” This term is critical for drilling supervisors, drillers, drilling engineers, and all rig personnel, as it directly impacts well control. In fact, if the BHP drops below the formation pressure, it can cause a kick …

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Formation Pore Pressure In Oil & Gas Wells

Formation pore pressure is the pressure exerted by the formation fluids on the walls of the rock pores. The pore pressure supports part of the weight of the overburden stress, while the rock grains take the other part [Rabia, 1985]. Formations are classified based on the magnitude of their pore pressure gradients. In general, two …

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Background Gas In Drilling Oil & Gas Wells

Background gas enters the mud circulating system as the formation is drilled by the drilling bit and usually maintains a steady but low level. Additionally, as shales are circulated up the hole, the reduction in pressure explodes the shale particles releasing gas into the drilling mud. These are the most common sources of gas. Pressure …

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Shut In Drill Pipe & Casing Pressure

After taking an influx, closing the BOP stack & shutting in the well, pressure will build up on the standpipe and casing gauges. This is because of the hydrostatic under balance (drilling fluid weight too low to balance formation pressure). The pressure on the standpipe manifold is “Shut In Drill pipe Pressure” SIDPP, and what …

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Underground Blowout Causes & Killing

An underground blowout is the flow of formation fluids from one zone to another. Most commonly, we can recognize the underground Blowout by a lack of pressure response on the annulus. And this response will be while pumping on the drill pipe or by a general lack of pressure response. The underground Blowout can be …

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Relief Well Operations & Planning In Oil & Gas

A relief well is a directionally drilled (Directional Drilling) offset wellbore whose purpose is to intersect a well that has well control blowing out, thus enabling the control of the blowout. Relief Well Plan The relief well plan shall contain, as a minimum: Relief Well Kill Requirement Limit Rate Modelling A relief well plan aims …

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BOP Rams Types, Applications & Features

The BOP rams are the result of some eighty years of development in the BOP stack system. The first BOP ram was developed in the early 1900s. The ram preventer will only seal on the specific condition for which the ram block is designed. Rams are interchangeable between ram-type preventers of the same design and …

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Formation Integrity Test Procedure & Calculation

FIT or formation integrity test can be defined as the application of pressure by superimposing a surface pressure on a fluid column in order to determine the ability of a subsurface zone to withstand a certain hydrostatic pressure. Why FIT? The reason for performing the formation integrity test or formation competency test is to determine …

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Well Control Formulas & Illustrated Examples

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 …

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