What is bottom hole sampling?
Bottom hole samplers are specially designed devices containing one valve or two valves at their extreme ends. They are run in the hole, on wireline, to the reservoir depth and the sample collected from the subsurface well stream at the prevailing bottom hole pressure.
What is a bottom sample?
Bottom Sampling Dredge Stainless steel sampler is designed for use on soft bottoms (sand or silt). Scissor design closes sampler, retrieving a volume of sediment to the surface for analysis.
What are sampling methods in biology?
Sampling methods of biological populations are Simple Latin Square Sampling, Capture Recapture Sampling, Inverse Sampling, Line Transect Sampling, Line Intercept Sampling and Adaptive Cluster Sampling.
What is downhole sampling in oil and gas?
Downhole sampling of fluids, also referred to as bottomhole sampling, is a key component of most hydrocarbon fluid sampling programs. The American Petroleum Institute publishes a detailed recommended practice, which is the most complete industry standard covering the sampling of pressurized hydrocarbon fluids.
What is fluid sampling?
Anew formation fluid sampling method separates filtrate contamination from the virgin reservoir fluid, and the fluid sample cleans up faster than with the conventional approach. Formation fluid samples provide essential information for field development.
How do you take an oil sample from a transformer?
Draw the sample by moving the handle towards the side port and allow the oil pressure to fill the syringe. Do not pull on the plunger! When the oil reaches the 40 to 45 cc mark, move the handle towards the syringe.
What is a Peterson grab?
The Peterson grab samples seabed sediments and organisms. Seabed sediments and organisms can give an indication of the overall health of the sea-bottom with respect to the microbiology. This is very important as the seabed sediments and their contents are the source of our nutrients when we get upwelling.
How many sampling methods are there?
There are two types of sampling methods: Probability sampling involves random selection, allowing you to make strong statistical inferences about the whole group. Non-probability sampling involves non-random selection based on convenience or other criteria, allowing you to easily collect data.
What is used for sampling of flowing liquids?
Sampling liquids, such as groundwater from wells, may involve the use of specialized “down-hole” sampling devices, with valves that can be remotely opened and closed, or of pneumatic or electrical pumps of various designs.
What is fluid sample collection process?
Samples are usually obtained through collection of the fluid in a container (e.g., urine, semen) or by inserting a needle into the body cavity and aspirating with a syringe a portion of the fluid (e.g., CSF, pericardial fluid).
Why do you test transformer oil?
Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. This is because it tends to deteriorate over time.
How is sampling like sampling of the whole?
When randomly selected, clusters can be assumed to represent the whole (like the city of Seattle), but with much less time and effort. Sampling is like tasting: you get a representative piece of the whole. Sampling efforts will be biased if you don’t take enough representative samples or sample randomly.
How are sampling methods used in biology fieldwork?
Divide a habitat into zones which appear different and take samples from each zone. For example, if vegetation cover in an area of heathland is 60% heather and 40% gorse, for a stratified sample take 60% of the samples from within heather and 40% of the samples from within gorse.
What kind of sampling is used to sample a larger population?
The methodology used to sample from a larger population depends on the type of analysis being performed, but it may include simple random sampling or systematic sampling. Types of sampling include random sampling, block sampling, judgement sampling, and systematic sampling.
What’s the difference between a sample and a sample?
Related Terms. Systematic sampling is a probability sampling method in which a random sample from a larger population is selected. A sample is a smaller, manageable version of a larger group. Samples are used in statistical testing when population sizes are too large.
