I’ve got some pictures of the Rig 325 in Mexico. I don’t know much details about it and it looks like the TDS hits the crown.
I wish those following images would help our people in the drilling industry raise the safe work practice awarness.
Today, I would like to share the great resport of the deepwater horizon – Macondo well published by the US Government. You can download the report for FREE.
Click Here to download the report => http://www.gpo.gov/fdsys/pkg/GPO-OILCOMMISSION/pdf/GPO-OILCOMMISSION.pdf
On April 20, 2010, the Macondo well blew out, costing the lives of 11 men and beginning a catastrophe that sank the Deepwater Horizon drilling rig and spilled nearly 5 million barrels of crude oil into the Gulf of Mexico. The spill disrupted an entire region’s economy, damaged fisheries and critical habitats, and brought vividly to light the risks of deepwater drilling for oil and gas — the latest frontier in the national energy supply. Soon after, President Barack Obama appointed a seven-member Commission to investigate the disaster, analyze its causes and effects, and recommend the actions necessary to minimize such risks in the future. The Commission’s report offers the American public and policymakers alike the fullest account available of what happened in the Gulf and why, and proposes actions — changes in company behavior, reform of Government oversight, and investments in research and technology — required as industry moves forward to meet the nation’s energy needs.
We published the article regarding Top 10 International Oil Companies In The World and there are few people asking about what the big oil company based on the hydrocarbon reserves are.
Today we add the new article showing top 10 oil companies based on oil and gas reserves. You will see that all of them are national oil companies. Please check out the link or click at the following image to read the article.
>> Top 10 oil companies based on oil and gas reserves <<
To get the good idea on how good of the hole cleaning is, the another method called Cutting Carrying Index (CCI) is utilized. The CCI is an empirical relationship from real data and the equation is below:
CCI = (K × AV × MW )÷(400,000) — Equation 1
Where;
AV is annular velocity in ft/min.
MW is mud weight in ppg.
K is a Power Law Constant.
The Power Law constant (K) can be calculated from the equation below:
Where;
PV is plastic viscosity in centipoises.
YP is yield point in lb/100sqft
n is flow behavior index.
The flow behavior index (n) can be determined by the following equation:
Where;
PV is plastic viscosity in centipoises.
YP is yield point in lb/100sqft
How will the CCI tell you about hole cleaning?
If CCI is equal to 0.5 or less, the hole cleaning is poor and the hole problem may be seen.
If CCI is equal to 1.0 or greater, it indicates that the hole cleaning is good.
Mud motor failure downhole may be happened from time to time. The questions that are usually raised are things like “How do I know if the mud motor fails down hole?” and “What indications will I see that this has happened?” etc. We would like to share our experience regarding mud motor failure and its symptoms.
The following signs indicate that you may be faced with downhole mud motor breakdown.
Frequent Mud Motor Stall – Motor stall happens when the rotor of the mud motor has stopped moving. Typically, the motor stalls only with a high differential of pressure. However, if the motor doesn’t perform as normal, it will get stalled with by a small amount of differential pressure. For instance, a mud motor normally drills at 400 psi differential pressure, but if the motor is stalled out with only 100 psi you can suspect the problem is with the motor.
Pressure fluctuation while rotating – Rotating with a good mud motor won’t create pressure fluctuations, whereas a bad mud motor will show fluctuation in stand pipe pressure and you may not be able to maintain constant pressure.
Abnormally high surface pressure – A stator is made of rubber. When the stator rubber is worn out and breaking into pieces, small parts of rubber can jam into the flow path in the motor. This situation also results in high stand pipe pressure.
Reduction in Rate of Penetration – If there are no changes in formation and drilling parameters, the decreasing in ROP (Rate of Penetration) may be caused by failure of the down hole tool. Moreover, if the took is severely damaged, you will be able to drill any footage.
What should you do if the problem is clearly identified?
If any failure sign is seen, it is recommended to pull out of the hole and change a new tool. It is almost impossible to drill with a damaged mud motor unless you only have a few feet to the well target depth.
With the mentioned indicators of mud motor failure above, you should be able to identify your suspected problem and begin troubleshooting as soon as possible to minimize non-productive time on a drilling rig.
References
Inglis, T.A. (2010) Directional drilling. Dordrecht: Springer-Verlag New York.
Mitchell, R.F., Miska, S.Z. and Aadnoy, B.S. (2012) Fundamentals of drilling engineering. Richardson, TX: Society of Petroleum Engineers.
Short, J.J.A. (1993) Introduction to directional and horizontal drilling. Tulsa, OK: PennWell Books.
