China
Africa
Explore chapters and articles related to this topic
When an End Was a Beginning
Published in Frank R. Spellman, Hydraulic Fracturing Wastewater, 2017
Produced wastewater is a complex mixture of dissolved and particulate organic and inorganic chemicals. The actual physical and chemical properties of produced wastewater vary widely depending on the geological age, depth, and geochemistry of the hydrocarbon-bearing formation, as well as the chemical composition of the oil and gas phases in the reservoir and process chemicals added during production (Neff et al., 2011). Water quality—The chemical, physical, and biological characteristics of water with respect to its suitability for a particular use.Watershed—All lands that are enclosed by a continuous hydrologic drainage divide and lay upslope from a specified point on a stream.Whipstock—A wedge-shaped piece of metal placed downhole to deflect the drill bit.Workover—To perform one or more remedial operations on a producing or injection well to increase production; deepening, plugging back, pulling, and resetting the line are examples of worker operations.
A data-driven probabilistic model for well integrity management: case study and model calibration for the Danish sector of North Sea
Published in Journal of Structural Integrity and Maintenance, 2020
Workover costs might vary largely, depending on the duration of operations and severity of damage. Indeed, there might be little difference between workover and failure costs, as the only possible repair is to substitute the full completion, and the cost of the rig per day is the major cost voice. Therefore, when the cost of failure and cost of workover are comparable, a little difference in the life cycle costs among strategies is expected. When the cost of failure largely differs from workover costs, a trade-off might be visible when comparing maintenance strategies. This is confirmed by the results of the simulations (Figures 12 and 14). In the following, for the reason of conciseness, results are illustrated for Field 1 only, but the same trend is found for Field 2.