In the petroleum industry, the wells test is the implementation of a series of planned data acquisition activities. The data obtained were analyzed to extend knowledge and increase understanding of the nature of the hydrocarbons in it and the characteristics of the underground reservoirs in which the hydrocarbons are trapped.
This test will also provide information about the state of a particular well used to collect data. The overall objective is to identify the reservoir capacity to produce hydrocarbons, such as oil, natural gas and condensate.
The data collected during the test period includes the volumetric flow rate and the pressure observed in the selected well. The results of well tests, such as flow rate data and gas gas ratio data, can support the well allocation process for the ongoing production phase, while other data on reservoir capability will support reservoir management.
Video Well test (oil and gas)
Coverage and definitions
There are many sense test wells and various ways to categorize the type of testing according to its purpose, but the two main categories are based solely on purpose, these are productivity tests and descriptive tests. According to the Oklahoma Committee's Omnia and Gas Wells Commission of The Lease Pumper's Handbook, there are four basic well test types: potential tests, daily tests, productivity tests, and oil gas ratio tests, the last three in the productivity test category which is wider.
The test objectives will change across different phases of the reservoir or oil field, from the wildcat and appraisal well exploration phases, through the field development phase and finally through the production phase, which may also have variations from the initial production period to recovery recovery at the end of the life cycle field.
Maps Well test (oil and gas)
Exploration phase
Professionals working with reservoir modeling can obtain information about the permeability of rocks from core samples. Other sources of information for this model are data logs and seismic data, but the data is merely complementary, and for example, seismic data is insufficient to interpret whether structural traps have been sealed. Information from well testing will increase the amount of information with flow rate data, pressure data, and others, necessary to build a rich reservoir model. The main objective in the exploration phase is to assess the size of reservoirs and states with certain certainty whether owning property for commercial exploitation and should contribute to accounting for available reserves.
Well testing performed prior to the completion of a permanent well is referred to as drill testing.
Field development phase
The reservoir model was further developed to support field development planning and to suggest optimal locations for additional production wells to be drilled. Descriptive well tests are designed and performed in new wells.
Production phase field
Path test
This test is also called a daily test and may have other naming names. Often, and especially in offshore fields, a number of wells produce a common separation, and flow from some separator or facility can lead to a mixed stream in a pipe carrying oil or gas for sale (export).
The total flow rate of all wells as a whole is measured, but contributions from individual wells are unknown. It is important to know the contribution of individuals to take into account the balance of hydrocarbon materials and for the monitoring and management of reservoirs well.
To get a good individual flow rate, it is common to use smaller test separators. This is an isolated and parallel-scale parallel processing system with normal flow. Regularly, for example once a month per well, the flow of one and only one selected well is directed to the test separator to determine the flow rate of the well for the selected well. The separator divides the flow from the well into the flow of individual products which are usually oil, gas and water, but may include natural gas condensate. Contamination can also be removed and fluid samples collected.
This helps to allocate the contribution of the individual flow rate, but the method has uncertainty. Flow rates, water cuts, GOR and other parameters for the test system may deviate from the production separator. This is generally taken into account by the allocation of products back to individual wells based on total field, and by using data from each well test.
Multi-flow flow meters should reduce the level of need for flow tests and test separators, thereby reducing production loss during testing.
References
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Aghar, Hani; M. Caire; H. Elshahawi; J. R. Gomez; J. Saeedi; C. Young; B. Pinguet; K. Swainson; E. Takla; B. Theuveny (Spring 2007). "Scope of Expansion Testing Well". Oilfield Review (Schlumberger magazine) . 19 (1): 44-59 . Retrieved 2013-05-23 .
Source of the article : Wikipedia
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