Kick Tolerance Concept and Calculation for Well Design

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Kick tolerance is the maximum gas volume for a given degree of underbalance which the circulation can be performed without exceeding the weakest formation in the wellbore. This article is the extended version of Kick Tolerance Calculation  which will explain more on this topic. It is very critical that drilling personnel understand its importance to well design and drilling operation.

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There are two important factors used for determining the kick tolerance

• Kick Intensity – It is the different between the maximum anticipated formation pressure and planned mud weight. For example, the planned mud weight is 13.0 ppg and the possible kick pressure is 13.5 ppg. Therefore, the kick intensity is 0.5 ppg (13.5 – 13.0).

A zero kick intensity (swabbed kick scenario) should be used for a know area where you have less uncertainty about an overpressure zone.

 • Kick Volume – It is a gas influx entering into the wellbore from the formation. Gas kick is always used for well control calculation because it is the worst case scenario. The kick volume should be realistic figure which personal can detect the influx on the rig. In a larger hole, it allows bigger influx volume than a small hole.

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Understand More about Pipe Rams, Variable Bore Rams and Shear Rams

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I would like to share these 3 VDO’s demonstrating how Pipe Rams, Variable Bore Rams and Shear Rams work.

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This eliminate confusion when the new people in the oilfield read and try to understand about these rams.

Pipe Rams – You will see that the pipe rams will work only on size of the drill string. 

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LeNorman Ruth 87-2H Fracking Accident – Hemphill County, TX

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I’ve got this email from my friend. The bad incident was happened in Hemphill County TX (LeNorman Ruth 87-2H Fracking Accident). I would like to share in order to raise awareness of safety in the field.

This is the detail from email that I got.

Never think your ‘Safe’ because you’ve got a good safety record; or even an excellent safety team. We sometimes tend to forget ‘what we do’ is inherently dangerous. Always think ‘at some level’ about witch way to RUN when everything goes wrong.

This was on a location where 2 wells were being worked at same time. One well a zone was being fractured, while the other well was being perforated. Hemphill county in Texas, there are two contractors involving in the operation.

They were pumping at 8,500 psig when the 7″ production casing parted, the surface casing parted above that and the Frac Head, BOP’s and all that came which landed square in the middle of the Cased Hole Truck.

We would like to emphasize the importance of safety because working in the oilfield always involves with high pressure, stored energy, etc. The failure of recognizing the hazard can result in loss of time, money, life, etc.

Safety is number one as always.

 

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