This is the oilfield incident resulting in our friend working on the rig got killed. It is very important that we need to heavily focus on the safety. Every year, people get injured due to several causes while working in the oilfield. For this case, there are several contributing factors the high pressure, line of fire, equipment inspection, etc. We want you to work safely for yourself and your family.
A high-pressure gate valve that came off a leaky standpipe on a Cyclone rig north of Parachute early in the evening of Oct. 21 struck and killed Shane Hill, 34, of Grand Junction and blew his body 6 feet away from the valve, a state report says.
Driller’s method and wait and weight method (engineer’s method) are widely used to circulate wellbore influx while maintaining bottom hole pressure constant. There are a lot of opinions regarding which method is the best for well control operation therefore this article will discuss about pros and cons of both methods.
The driller’s method requires two circulations to kill the well. The first circulation is to circulate influx out of the well with original mud weight. The second circulation is to kill the well with kill weight fluid. During the first circulation, the bottom hole pressure remains constant due to maintain drill pipe pressure constant while circulating. For the second circulation, in order to maintain constant bottom hole pressure, casing pressure is held constant while circulating kill mud to the bit. Once the kill mud passes the bit, the drill pipe pressure will be held constant until the kill weight mud is on surface and there is no sign of influx in the annulus.
Wait and Weight Method
The Wait and Weight method requires only one circulation. The influx will be circulated out while the kill weight mud is displaced into the well simultaneously. While pumping the kill fluid from surface to the bit, drill pipe pressure schedule must be strictly followed. After that the drill pipe pressure is maintained constant until the kill mud returns back to surface. Some people call the Wait and Weight method as “Engineer’s Method” because there are more calculations compared to the Driller’s method.
Comparison between Driller’s Method and Wait and Weight Method
1029.4 is used in several calculations in the oilfield and we’ve been asked about what is 1029.4, how it comes from, why it needs to be this figure so in this article, we will show you how 1029.4 comes from.
First of all, we would like to give someone about the background of this figure. The 1029.4 is widely used for capacity calculations. The following equations utilizing 1029.4 are listed below; Continue reading
Retort analysis is the method to determine solid and liquid components in the drilling fluid. In this article, we will adapt mass balance and retort analysis data to determine solid density in the mud.
Mass balance for mud is listed below;
We can rearrange the Euqation#1 in order to determine the solid density
Coring is a special process to recover wellbore rock in the well.
Figure 1 – Core from the well. Credit – Wikipedia
This article will demonstrate how to calculate coring cost per footage recovered.
Coring cost per footage recovered is expressed below;