Category Archives: Well Control

Stripping Procedure with Volumetric Control For Migrating Kick

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With gas kick in the well, the conventional stripping method is not application because it won’t account for the gas migration and expansion; therefore, the special stripping procedure, Stripping with Volumetric Control, will be utilized for this case. This procedure is designed to strip the drill string back into the well with gas influx while the bottom hold pressure is maintained nearly constant.

Figure 1 - Stripping With Volumetric Control

 Figure 1 – Stripping With Volumetric Control

 

The Stripping with Volumetric Control procedures are as follows;

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Stripping Procedure without Volumetric Control for Non-Migrating Influx

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This article will teach you about the stripping procedure for non-migrating kick. This procedure is used to strip to desired depth but it won’t account for volumetric bleed therefore it is mainly applicable for stripping with non-migrating kicks as water or oil.

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Basic Understanding of Stripping Operation Well Control with Gas Influx

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In the previous articles, we discuss about the stripping operation and techniques with non-migratable kicks as oil and water kick. This article will focus on the stripping operation with gas influx and we are going to describe some additional considerations that you need to account for. Gas kick is different from the liquid kicks because gas can naturally migrate. The gas migration affects the stripping operation because increase in casing pressure due to gas migration must be taken into considerations.

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Kick Penetration For Stripping Operation

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Kick penetration is one of the most critical concerns for stripping operation because a kick height will change due to change of hole geometry. In this this article, we will describe about this situation.

35-Kick-Penetration-in-Non-Migrate-Kick

This is will be happened when the string penetrates the kick.Height of influx will increase when the drillstring penetrates a kick; therefore, hydrostatic pressure decreases and casing pressure increases in order to compensate this situation.

If the casing is maintained constant while penetrating the kick, you will have high chance to take more influx because of underbalance situation (Figure 1). This article will teach you about how to determine pressure increment while penetrating into the kick, what to look for, etc. Continue reading →

Shallow Gas Hazard in Well Control – Sedco 700 Shallow Gas Incident

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Shallow gas is one of the most dangerous incidents in well control because you don’t have the BOP set to be able to control the well. Additionally, shallow gas always happens at the shallow depth as surface hole section where you will have a difficulty to control the well. This footage below show you how serious of the shallow gas in an offshore environment.

Sedco 700 Shallow Gas Blow Out 6 June 2009

Additional details about shallow hazards that you need to know.

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