This article provides basic concept of drilling waste volume estimation. These calculation methods can be utilized to compare and optimize the solid control equipment as well. Before I will go into the detailed formulas, I need to have a little bit more background regarding the drilling waste. When we talk about drilling waste, not only is the cuttings but it includes waste of drilling mud, cement, spacer, etc. There are several factor affecting the drilling waste volume such as hole size, solid control efficiency, formations drilled, the amount of drilling mud retained on the cuttings, the ability of drilling mud to sustain in the system, etc.
There are few terminologies that you need to understand as listed below:
Hole Volume (HV) – hole volume is typically expressed in bbl or cubic meters.
Solid Discharge (S) – volume of wet cutting discharged
Liquid Discharge (L) – unusable drilling mud is discharged when it reaches the solid content tolerance.
Efficiency of Solid Control (E) – the percentage of incoming drill solid which is removed by solid control equipment
Fraction of dry solid (Fs) – the percentage of dry solid in the cutting system and it varies from 25% to 50%.
Tolerance of Drilling Fluid to Solid Contamination (T) – It is a term that is used to express the frequency of dumping drilling mud.
Solid build up in the drilling fluid (DS) – The volume of drilled solid in the drilling mud and the dilution is the method to keep the mud in a good condition.
In the next topics, we will show some calculation regarding waste volume estimation.
Lost circulation is one of the most difficult drilling operation issues and it can cost a lot of money in order to fight with it. Nowadays with recently drilling fluid technology, there are more comprehensive and effective methodologies to prevent lost circulation. We’ve found the excellent presentation in the topic of “How to Stabilize and Strengthen the Wellbore during Drilling Operations” by Dr Fred Growcock, Society of Petroleum Engineers, Distinguished Lecturer Program. This presentation will teach you the following topics;
The Lost Circulation Problem
Strategy for Managing Lost Circulation
Wellbore Strengthening Wellbore Strengthening
Wellbore Stress Enhancement
Application Strategies on the Rig
Case History Case History
This will give you another idea on how to approach the lost circulation problem. These captured screens are some samples of the presentation.
Mud storage and tanks / reserved pits are one of the critical rig equipment. It must provide enough volume for drilling operation. It sounds simple however personnel must really understand about it otherwise it will affect the overall operation. Today, we would like to share this excellent vdo training in the topic of “Mud Storage and Tanks and Reserve Pit Overview” and the full VDO transcripts is provided to help someone gets full understanding on this subject. We wish you would enjoy this topic.
Full VDO Transcript
Mud is made up at the Rig location. Most Rigs have several steel Mud Tanks. Muds and additives are mixed and held in the tanks. Some land Rigs also have a Reserved Pit dug out of the ground. Mud tanks are also called Mud Pits, a carry-over from the days of earthen pits. Mud Tank is the preferred term. The Rig does not necessarily use all the Mud Tanks at once although it does use several. The Active Tanks hold mud the pump actively circulates. Often mud components come to the Rig in sacs.
Mud conditioning system is one of the critical systems on a drilling rig because it helps keep the drilling fluid in the specification. Drilling with good mud properties drastically reduce operational risks as pipe stuck, high ECD, etc. This VDO will demonstrate you the basic knowledge of mud conditioning system. We also add the full VDO transcript to help people who sometimes cannot catch all content in the VDO. We wish you would enjoy learning about the mud conditioning system from this VDO. Please feel free to give us some feedback.
Full VDO Transcript
The Shale Shaker mechanically takes out the large cuttings from the mud. It does not however, remove very fine cuttings and other small solid particles. These solids can be fine sand particles and other very fine materials often called silt. Good drilling practice requires removing these undesirable solids. If not removed the solids can increase the weight of the mud more than required, reduce the bit’s penetration rate and significantly increase the rate of wear on circulating equipment.
Mud tests are very crucial activities on a drilling rig. Good mud test will help you identify issues before it becomes even worse. Hence, we would like to emphasize on this topic today. The excellent footage below will teach you overall of mud test. In this VDO, there are several images which will definitely help you learn and get clearer pictures on how mud tests are performed on a drilling rig. Additionally, we provide you the full VDO transcript for accelerating learning process for someone who cannot catch the wording in the VDO clearly.Hopefully, you will enjoy learning this topic.
Oil based mud is widely used nowadays for drilling industry because it has good mud properties which waterbased mud cannot provide. However, it also has the drawback as well. Therefore, this article will recap both pros and cons of oil based mud in a simple way.