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. [click to continue…]
There are several situations when a kick is induced by swabbing effect. Today, we are going to discuss swabbing and well control situation. Swabbing is a condition when the string is pulled out of the well and it creates temporary bottom hole pressure reduction. If the hydrostatic pressure reduction is large enough to create underbalance condition, the well will eventually flow.
When you swab the fluid in, the swabbed fluid may not necessarily cause pit gain or the well flowing because the volume swabbed in is not significant. However, if you have several swabbed-in fluid, the well will finally flow.
Figure 1 – Take Swabbed Kick
It is quite tricky to recognize the swabbing volume and the most trustable method to detect is by tracking hole fill volume. For example, if the volume displacement for 10 stands pulled is 8 bbl but the hole fill volume is just only 6 bbl, 2 bbls of kick may possibly be swabbed in while tripping out. Once the swabbing is detected, you need to trip back to the bottom and circulate bottom up even though the well is not flowing. If you don’t go back to the bottom, it will be very difficult to control the well off bottom once the swabbed gas moves up to shallower depth of the well. [click to continue…]
Many people works on the oil rigs both offshore and onshore operation and a lot of people may get bored with the rig. Therefore we would like to share some spectacular drilling rig images. There are various rig types as land rig, shallow water rig, offshore deepwater rig, etc at various environment. At least, we wish these photos would inspire you
Please feel free to share with your friends and colleagues.
Mud gas separator located at downstream of the choke manifold is one of the important well control equipment that you need to focus. It separates gas out of the mud after the gas comes out of hole. Gas will be vent to atmosphere via the vent line in derrick (offshore operation) or the line away from the rigs (land operation) and the mud will be returned back to the pit. In the oilfield, people have several names for the mud gas separator as “poor boy degasser” or “gas buster”. While drilling, the mud gas separator should be lined up at all times and filled with the present mud weight currently used.
The concept of this equipment is density difference between liquid and gas. When the mud coming out from the choke manifold goes into the mud gas separator, mud will hit the baffle plates which are used to increase travelling time and allow gas to move out of the mud. Gas which has lower density than air will move up and mud will goes down due to gravity (see – Figure 1). Mud leg will provide hydrostatic pressure in order to prevent mud going through the separator into the rig. [click to continue…]
Drilling bits are one of the key tools to achieve good performance drilling and there are several types of bits. Therefore, personnel need to understand in order to use the right bits for the task. Today, we would like to share this excellent VDO teaching you about drilling bits. This VDO is excellent for everybody because it has a lot of illustrations and animations along with full explanations. As usual, we have full VDO transcript for anyone who cannot catch the wording from this footage.
As we discussed in the last section, crew members install the bit on the on the bottom drill collar. Two kinds of bits are roller cone bits and fixed cutter bits. Fixed cutter bits are also called fixed head bits. Roller cone bits usually have three cone shaped devices with teeth or cutters. As the bit rotates the cone and cutters rotate to drill a head. Fixed head bits also have cutters but manufacturers embed them in the bit’s head. The bit’s head moves only when the bit rotates. It has no moving parts like the cones on a roller cone bit. Both roller cone bits and fixed head bits come in sizes ranging from 2 or 3 inches or about 50 – 75 millimeters in diameter to more than 36 inches about 1 m in diameter.
Bit balling is one of the drilling operational issues which can happen anytime while drilling. This issue can cause several problems such as reduction in rate of penetration and surface torque, increase in stand pipe pressure. Personnel may eventually need to pull out of hole the BHA in order to clear the balling issue at the bit. This article will teach you about the bit balling and how to prevent it in the planning phase and how to effective detect and clear the balled up bit before it becomes a worse problem.
How You Recognize the Bit Balled Up While Drilling
Drilling Torque – Drilling torque will be lower than normal drilling torque since most of the cutters are covered up by cuttings.
Rate of Penetration – The ROP will decrease more than projection. If you drill 100 fph and later on the ROP drops to 50 fph without any drilling parameters changed, this might be this problem.
Standpipe Pressure – Standpipe pressure increases with no changes in flow rates or drilling parameters. Balling up around the bit reduce annular flowing area resulting in increasing pressure.
Adriatic IV Blowout incident is one of the worst oilfield incidents happened in our industry. We need to learn and understand about it so we can prevent this incident to reoccur again in the future.
In the month of August 2004, Adriatic IV was placed near the Temsah gas production platform, off Port Said situated in Egypt (Mediterranean). The rig was busy drilling a natural gas well and there was a gas explosion which took place. It has been vindicated through reports that the blast was followed by a fire which later escalated to the Petrobel-run platform where it was raging persistently for about 7 days after which it was taken care of. About 150 personnel on the jack-up were saved and all the production and functions were stopped.
It was vindicated through studies and reports by Global Santa Fe that the Adriatic IV was completely submerged and could not be saved or restored. Joint owners of the platform were Italy’s ENI, BP & Egypt’s General Petroleum Corporation and the platform was completely in a dilapidated condition and hence the Egyptian Petroleum minister commanded to destroy it completely. In about 12 months following the catastrophe, the Temsah field and its production activities were restored in a full-fledged manner.
Always ensure that SIMOP’s are properly conducted.
Fault is a discontinuity in a geological structure and it sometimes can create abnormal pressure. Hence, you need to really understand how the geological fault can cause higher pressure even though it comes from the same reservoir.
There are three fault types which are as follows;
Strike-slip, where the offset is predominately horizontal, parallel to the fault plane.
Dip-slip, offset is predominately vertical and/or perpendicular to the fault plane.
Oblique-slip, combining significant strike and dip slip.
Gas kick behavior in horizontal wells is different from the gas behavior in normal wells (vertical and deviated wells). Gas follows Boyle’s gas law when it moves up to the shallower section of the wellbore. However, in the horizontal section, there is no change in volume because gas will move up to high side of the wellbore and there is no change in pressure.
The gas kick volume will increase when the kick is circulated out of the horizontal section because the reduction in hydrostatic pressure results in expanding of gas as per Boyle’s gas law (see below).
The standpoint for employment in the industry of oil and gas today has been consistently vehement. Most people are expecting a “crew shift” transformation because today a lot of existing employees are quitting or retiring due to which there is substantial demand and fresh employment opportunities. The petroleum industry is one of the most wanted industries for employees because of challenge and payment. There has been increasing need for people who are skilled and credible, ranging through different genres from roustabouts, drilling supervisors, geologists, & engineers, health and environmental consultants, etc. A couple of strong years of experience and consistency in the oil and gas industry could lead to brilliant opportunities and a bright future ahead. However, the question that arises is- “How should one go about it?”
Usually people can start their journey in this industry through technical or entry-level positions, which might need certain qualifications, but it is not mandatory. It could be helpful to have some kind of knowledge or experience in mechanical or electrical knowledge because these skills can land you a job in oil & gas industry easier. Your resume will get better with safety-related or technical certifications. Apart from these, leadership & communication skills, working under pressure, being a perfectionist, team work and co-ordination are also required.
Offshore or Onshore?
Positions for both offshore & onshore are available; however, offshore jobs have better pay since individuals with more experience are chosen for the offshore jobs. In fact, offshore operations are quite expensive hence safe & efficient operations are crucial. There are some who think of offshore jobs as more dangerous, and require workers to stay away from home for longer time. There’s no doubt that such kind of jobs involve more long hours of duty and more difficult task, but when it comes to pay, it’s worth it. [click to continue…]