DWL offers gas measurement services from Stand-Alone systems to Mass Spectrometry.
For our Surface Measurement While Drilling service, C1 to C5 chromatographic data is recommended as the ‘basic’ level of gas analysis. With this data we are able to ‘map’ formation fluid and trend changes within a single well, well-to-well, and across fields. With a combination of gas ratios, cross-plots and other indicators, we track and correlate hydrocarbon signatures in realtime. Mass Spectrometry opens another level of formation fluid analysis with inorganic and atmospheric gases that can point to natural fractures or faults and a better indication of formation water.
DWL's focus on gas, cuttings, and artificial intelligence is part of our vision of a more cost efficient oilfield. By using material that is available on every well in every environment, we are providing some of the best formation evaluation available plus data to ultimately improve completion plans and production results.
Data Quality in Formation Gas and Fluid Analysis
In all of DWL's varied gas services quality is key. We have a daily quality control process that begins at the rigsite, passes review at a regional level, and ends with final verification by a DWL data quality specialist.
With quality controlled and assured, our gas and fluid evaluation of the formation can begin with an overview and comparison of gas curves and lithology - either from sample descriptions or, if available, from modelled lithology and mineralogy from our Hybrid Mudlogging Service. The gas data is then manipulated through normalization, gas ratio calculation, curve overlay and comparison, and cross-plotting to better visualize zones of possible interest and fluid changes throughout the wellbore.
Diversified Well Logging's gas and fluid analysis allows you to build a picture of hydrocarbon fluid change within the well. Using our methodology from well to well on a pad or across a field, we can correlate to identify differences that might indicate faults, fractures, or lateral facies changes that may have gone unnoticed. By adding data to the regional 'model' while drilling each well, the picture of production expectation indicated by gas analysis will be refined. Production data will further define the model, driving confidence in the realtime gas. We always emphasize that every well is different and homogeneity can be a rare thing.
ADVANCED FLUID ANALYSIS
Using the expertise of the T!Ps analytical team, DWL, under the banner of its Surface Measurement While Drilling suite of services, use mud gas to expand the knowledge of formation fluid composition.
With T!Ps workflows gas data can be used to aid in:
- Understanding formation fluid densities to aid in mud weight selection
- With Gas-In and Gas-Out, determine recycled gas vs. new formation gas to avoid mistakes such as unnecessary weighting up and potential mud loss
Hydrocarbon Systems Interaction
- Fluid composition (e.g. GOR) in all pay zones
- Proximity to pay (either in bypass or in water leg down dip of pay)
- Identification of Barriers and baffles
- Bit burn (e.g. false shows)
- Fluid variability in pay (help guide PVT and other geochemical sampling/analyses)
- Vertical connectivity
- PVT quality fluid data for all pay sands without wireline samples
VOLATILES ANALYSIS SERVICE
Optimize and Understand Gas Plays with Advanced Geochemical Cuttings Analysis
DWL offers the Volatiles Analysis Service (VAS), supplied by Advanced Hydrocarbon Stratigraphy, in conjunction with Baker Hughes as a strategic partner. This is an advanced geochemical analysis that provides detailed information on the composition of entrained volatile chemistries (gases and fluids) from geological materials (PDC cuttings, rock bit cuttings, side wall core, core, etc.) be they legacy (several years/decades old) or hermetically sealed at the well site. The volatiles monitored are extensive and provide unique insights into the geochemistry of the subsurface system in addition to providing a mechanical strength index and species by species permeability indices.
VAS assists the exploration/development of gas plays by:
- Assessing EUR, resource concentration, and resource quality/composition
- Evaluating the effect of structural features on a well
- Understanding the petroleum system
VAS is a low risk nonintrusive method for efficiently and affordably logging laterals and challenging conditions such as high temperature and/or high-pressure (HT/HP) wells.