This article describes the keys elements for the stripping method for well control This procedure is recommended when the drill string is partially or completely out of the hole. The basic principle of this technique is to maintain the BHP constant with the well closed and while running drill pipe. This will be achieved by … Well Control – Stripping Method
If normal well killing techniques with conventional circulation are not possible or will result in critical well control conditions, bullheading may be considered. Mud/influx are displaced/squeezed back downhole into the weakest exposed open hole formation. Bullheading may be considered when the following well control situations occur: H2S influx cannot be handled safely by rig personnel … Well Control – Bullheading
When the standard well control method (drillers’ or weight and wait) are not suitable, alternative methods can be considered: Stripping, bullheading, volumetric, off-botton, no circulation, etc 1. Stripping This procedure is recommended when the drill string is partially or completely out of the hole. The principle of this technique is to maintain the BHP constant … Non-conventional well control methods
The pressure at the top of a gas bubble at any point in the annulus while circulating it out using the Driller’s method can be calculated as follows: By calculating the expected annular pressures at the top of the influx at specific points along the wellbore together with the associated influx volumes at these points, … Pressure at the top of a Gas Influx in the Annulus using the “Driller’s Method”
The pressure at the top of a gas bubble at any point in the annulus while circulating it out using the “wait and weight” method can be calculated as follows: By calculating the expected annular pressures at the top of the influx at specific points along the wellbore together with the associated influx volumes at … Pressure at the top of a Gas Influx in the Annulus using the ‘Wait and Weight’ Method
Procedure and calculation example for Change in Circulating Rate while circulating an influx during a well control incident. 1. Calculate the average mud weight (Wav) in the string at the time pumping is stopped or changed. 2. Calculate shut in drillpipe pressure (PDP) at the time pumping is stopped/changed. 3. Maintain Pchoke constant for the … Procedure and Calculation example for Change in Circulating Rate
Wireline BOPs are not normally used for open hole logging operations or cased hole operations where the Drilling BOPs are installed. Exceptions to this rule are: Open Hole logging operations (rig on site) where losses or kicks have been encountered during drilling. The Drilling Supervisor and Drilling Engineer shall decide if a 7in shooting nipple … Well Control during Logging Operations
If normal well killing techniques are not possible or will result in critical well control conditions bullheading may be considered whereby mud/influx in displaced/squeezed back into the weakest open hole formation. Bullheading is a critical option of well killing and authorisation to proceed with this method of well killing must generaly be obtained form the … Bullheading
In this method the well is killed in two circulations. In the first circulation the influx is circulated out using the original mud. In the second circulation, when weighted up mud is available, the well is killed. Advantages of the Driller’s Method pumping can begin as soon as drillpipe pressure build-up is established; there is … Well Kill Using The Driller’s Method With The Bit On Bottom
The “Wait and Weight” method is the method recommended, in some circumstances, for controlling an influx taken while drilling or circulating on bottom. When drillpipe (string) volume is greater than open hole volume, the influx will already be inside the casing before heavy mud reaches the open hole. In this case the “Driller’s Method” can … Well Kill Using Wait and Weight Method (Balanced Method)