During the exploration and appraisal phases field data is collected for the determination of reservoir parameters which will govern the Field Development and production strategy. Permeability-thickness, hydrocarbon properties and reservoir extent are critical parameters acquired during this phase which are used to evaluate expected well and reservoir performance. Dynamic Flow tests, combined with Downhole Fluid Analysis and fluid samples are commonly used to obtain this information. The most common flow tests today use either Wireline Formation Testers (WFT) for small scale tests, or Drill Stem Tests (DST) for larger scale flow tests. This paper will describe a workflow in which the information acquired from the small scale WFT tests can be used to optimize the design and execution of the larger, and typically more costly, DST’s. The ultimate goal of the workflow is to increase the value of the information obtained, and the overall success rate of the DST’s performed.
Bright children are delightful youngsters, fun to be with, and pleasant to have around. If nothing untoward has happened to them in their early years, they respond enthusiastically to normal recognition, attention, and friendliness. These children talk about their interests, activities, and aspirations very much at an adult level. They will even listen sympathetically to teachers and parents discussing their own personal affairs if the adults are genuine and sincere. In this respect, children with high mental ability are surprisingly mature. They take a personal interest in worthy adults and reward them with understanding and loyalty. If teachers and parents are not honest and frank with them, bright children will be quick to recognize the insincerity, although they may never reveal their discovery. Systematic evaluation of adults is characteristic of most children. Among bright children of almost any age the tendency is more highly developed. They view carefully, assess critically, and, if they approve, accept gladly.Bright children are first of all children. They need love, security, companionship, acceptance, motivation, challenge, opportunity for selfexpression, guidance, appreciation, and other fundamental support that fosters the effective development of all children. At home with intelligent, reasonable, understanding parents, these needs generally are satisfied. In neighborhoods and groups where youngsters of similar abilities, interests, and temperaments get together, bright children usually are happy, active, well-adjusted boys and girls. Such homes and neighborhoods are likely to provide opportunities for living, learning, and growing which are compatible with the needs of bright children.
Hydrocarbon production from fractured basements holds great promise as an unconventional hydrocarbon source. These unconventional reservoirs are key in meeting the world's increasing hydrocarbon demand. However, basement characterization faces great technical challenges. Traditional formation evaluation methods, such as saturation estimation using resistivity-dependent equations, are often ill-suited to the basement environment because of complex mineralogy including conductive and heavy minerals. A workflow integrating the results from various advanced well log interpretations provides a robust foundation for successful tapping of hydrocarbon potential from fractured basements. In the case study presented, a workflow is described in which the fractured basement underlying the sedimentary rocks of an offshore development field west of India was tested for the first time using the wireline-conveyed dual packer interval pressure transient testing (IPTT) technique. Pressure-volume-temperature quality oil samples were collected, gas/oil ratio was measured in real time, and formation pressure was recorded. The test was made possible by effective screening of potential test intervals using an enhanced workflow in which the newest generation of the nuclear magnetic resonance scanner was used for hydrocarbon saturation and permeability determination in conjunction with classical openhole logs and other advanced logs. Stoneley waveform analysis and borehole micro imager-derived results were useful in detailed fracture characterization and optimization of the dual packer position for a successful IPTT operation that proved oil production from fractured basement. Introduction Due to decline in the production rates of the field and increasing energy demand, there has been an intensified quest to explore hydrocarbons. The field, located western offshore India, is producing from a carbonate reservoir, there exist a fractured basement beneath this carbonate reservoir that might be hydrocarbon bearing. If properly characterized and evaluated, this basement could open up a new source of hydrocarbons that could be boon to India's oil industry. Wells were drilled deeper into the fractured basement, and the first few wells were evaluated with conventional openhole logs. The oil potential of this fractured basement was learned when the wells flowed oil to the surface during barefoot drillstem testing, revealing a new source of oil. Further testing showed that the new found oil reservoir was not as simple to characterize or evaluate as new wells produced oil at different rates during production testing. Figure 1 shows basic openhole logs of two different wells in which one well tested at a rate of 800 bbl/d and the other at a rate of only 40 bbl/d. It is difficult to ascertain the reason for this difference in flow rate on the basis of a basic openhole log shown in Figure.1. This variation in rate hints at a complexity of fractures and formation that needs to be understood before the basement can be exploited. Variation could be in terms of fracture orientation, or possibly only a particular type of fracture set might be hydrocarbon bearing, or there could be a well placement issue in this fractured basement. These variations could not be addressed by running conventional logs only. This paper describes what can be done to better understand and characterize the fractured basement through an integrated approach, incorporating elemental capture spectroscopy, dipole sonic, and formation microresistivity image data to characterize the complex architecture of the rock. Elemental capture spectroscopy provided dry weight elemental composition while microresistivity image data provided morphological and textural information in addition to resistivity variation. Elemental capture spectroscopy data and image data, when integrated, bring out the compositional variation along with textural details, with fracture and foliation patterns. The information obtained from these logs can be decided to isolate the desired fractures to enable Interval Pressure Transient Testing (IPTT) by using dual packer, which would give us formation pressure and fracture properties such as storativity and interporosity flow parameters.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.