Well Formation Characterization by Residual Hydrocarbon Analysis
- Mabre Maness (Core Laboratories Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- January 1979
- Document Type
- Journal Paper
- 118 - 120
- 1979. Society of Petroleum Engineers
- 5.1.1 Exploration, Development, Structural Geology, 2 Well Completion, 4.1.2 Separation and Treating, 1.6 Drilling Operations, 1.6.9 Coring, Fishing, 5.2.1 Phase Behavior and PVT Measurements, 5.5.2 Core Analysis, 4.1.5 Processing Equipment
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Information supplied by current wellbore evaluation methods often is insufficient for optimum well completion. Recent developments indicate that additional data useful for this application may be obtained from the composition of residual hydrocarbons in drill cuttings. As early as the mid-1950's, Smith and Evans demonstrated that residual hydrocarbons could be used to characterize some geologic formations. The general principles involved later were extended by Reed and Warren and Scrima to oil shale formations using pyrolysis techniques and thermal chromatography. In pyrolysis techniques and thermal chromatography. In 1974, Baker expanded their work to include petroleum source-rock evaluations. Other investigators during this period experienced only limited success in modifying the technique for use in wellbore evaluations. This paper describes a pyrochromatographic analysis that has proved useful when characterizing the producing potential of certain types of wells. potential of certain types of wells. Description of Method
Our method involves the premise that not all hydrocarbons in bits of formation rock are lost when these samples are brought to the surface during normal drilling procedures. Phase behavior and formation permeability procedures. Phase behavior and formation permeability phenomena responsible for residual hydrocarbons in these phenomena responsible for residual hydrocarbons in these samples have been well documented. Relationships between residual hydrocarbon saturations and formation production potential also have been well established. Our method potential also have been well established. Our method uses these relationships to correlate characteristics of test sample hydrocarbon with well production potential.
The analyzer used was composed of a low dead-volume pyrolysis unit attached directly to a flameionization gas pyrolysis unit attached directly to a flameionization gas chromatograph. A large pyrolysis chamber (1 m1 in volume) was developed to allow the testing of larger, more representative formation samples.
Fig. 1 - Carbon-number distribution for nonproductive formation.
Fig. 2 - Cumulative percent curve for nonproductive formation.
|File Size||151 KB||Number of Pages||3|