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Well Test
Published in Zekâi Şen, for Scientists and Engineers, 2017
A well test is a specific type of pumping test designed primarily to evaluate well characteristics. Successful completion of any groundwater resources system is possible only after an effective evaluation of aquifer and well characteristics in addition to the reliable predictions of the groundwater variables. Among such variables are the groundwater levels, drawdowns, and discharge which vary with time and space and they are interdependent among themselves. For instance, drawdown in a well is directly proportional with the discharge.
Depth prediction by using various velocity models of Khasib Reservoir in East Baghdad field, Iraq
Published in Petroleum Science and Technology, 2023
The main purpose of this evaluation of 14 structural depth maps of Top Khasib Reservoir is to select the accurate depth map from these depth maps and then it used to generate the 3D geological model. Therefore, in the present study, three quality control criteria are used in this evaluation. These criteria are: Mis-tie or difference between estimated and real depth at well control.Standard deviation (S.D) value for each depth conversion method.Blind well test carried out at EB 24 and EB 26 well locations.
On application of machine learning method for history matching and forecasting of times series data from hydrocarbon recovery process using water flooding
Published in Petroleum Science and Technology, 2021
To overcome the challenge related to data collection in a production well, a concept of “well test day” has been developed (Lee 1982). Typically, once in a week, for an hour the raw output of production well fluid, oil, water and gas, is collected separately using a separator and once the separation process is complete measurements are taken for accurately calculating quantities of oil, water and gas produced. These readings are the true measurements of the amount of oil, water and gas produced by the well. Since these readings are taken for 1 h, they are then multiplied with 24 h to come up with the closest possible true oil and gas production rate for that “well test” in a day. The next well testing day is generally after an interval of 7–10 days or whenever there is a major change in the well’s production behavior. In the meantime, oil, gas, and water production rates of 1 well test day are copied for all the subsequent days till the next well test day’s recording is available.
The application of modified isochronal well test in a low-permeability condensate gas field
Published in Geosystem Engineering, 2019
Zhaojing Zhou, Xiuwei Wang, Xue Miao, Kangning Qian, Lijian Li, Peng Xu, Xiuqin Lu
The log–log curve of well A1 shows the characteristics of homogeneous reservoir, and the semi-log curve rises slowly for the characteristics of low-permeability reservoir. From the log–log curve, in the early wellbore storage stage, the pressure and derivative curve coincide, which is a constant well storage reaction; the reservoir permeability is low; After one log cycle, it enters the system radial flow; there is no boundary reflection in the later stage. The model of ‘constant well storage + variable skin + homogeneous gas reservoir + infinite boundary’ was adopted for comprehensive analysis. The results of well test interpretation are shown in Table 2. The effective permeability of the test layer is 7.25mD. According to the classification standard of gas reservoirs, the B gas reservoir is a medium-permeability gas reservoir; the total skin factor is 7.52, indicating that there is a certain degree of damage in the reservoir.