The role of well testing in reservoir characterization. However, it should be noted that extended well tests are not an alternative to. Pdf well testing and interpretation for horizontal wells. Testing wells is an essential part of any pumping operation. Not only are evergreen subjects, such as layered reservoirs, naturally fractured reservoirs, and wellbore effects, covered in depth, but newer developments, such as well testing for horizontal wells, are. The activity concludes when the well has been killed and the test string has been recovered. Falloff test is the most common type of test in which pressure decline is determined as the function of time.
A well test model for composite reservoir with resistance force. If the well is going to be shutin anyway, record the pressures and try to learn something about the reservoir. Youre probably going to spend a fair bit of time around the lease performing tests of different sorts. Operational aspects of oil and gas well testing, volume 1. Constructing and maintaining a well is a team effort involving many people with different skills every individual is important.
New jersey private well testing act program september 2002 april 2007 private well testing act program july 2008. Go to well testing, results, and options for more information on how to test your well water and what to do with your test results. Oil well testing handbook is a valuable addition to any reservoir engineers library, containing the basics of well testing methods as well as all of the latest developments in the field. Sunry designs and delivers well testing package, trailer mounted well testing package and offshore well testing package more than 10 years. The objective is to provide an easy to read introduction to classical well test theory. This blog post by tory nudd, vice president, strategic business development. Various types of surface pressure tests usually for gas wells.
Sunry designed them according to chinese standards metric system. Hence, a tradeoff between technical and economic objectives is necessary. Final abandonment notices shall be filed only after all requirements, including reclamation, have been completed, and the operator has. Basic concepts in well testing for reservoir description. You may need a pdf reader to view some of the files on this page. The scope is to define the quality of the formation fluid. Data gathered during the test period includes volumetric flow rate and pressure observed in the selected well.
The usual method of investigating the reservoir is to conduct a well test and there are two methods which are available. Geologists, drilling engineers, production engineers and reservoir engineers with 15 years experience. In its most basic form, a well test records changes in downhole pressure that follow a change in flow rate. Flow in porous media is a very complex phenomenon and. Initially, horizontal well tests were analyzed with the conventional techniques designed for vertical wells. This circular provides clarification and guidance concerning testing of individual private water supply systems for properties subject to department of veterans affairs va backed loans. Make sure youre serving your family safe drinking water. In addition to standard packages, expro supports its surface well testing with a dedicated engineering team to provide bespoke solutions for. Non oil and gas well a well drilled for any purpose through sedimentary. Well used ndt is a highly valuable tool that can save both money and time as part of an aim programme. In the north sea, it is very common to call a production flow test a well test.
They are operated by sinopec and or cnpc in chinese mainland, south asia, middle east, africa and south america. Practical hardness testing made simple 11 the results obtained, even when the test was performed with utmost care, could be wrong. Well testing is also known as pressure transient tests, which arguably gives a. Regular testing of a well using different oil and gas well testing procedures is the only way to discover important information, which will be necessary to making decisions about production as well. The dst or drill stem test used in both oil and gas wells, in cased or uncased wells. Page 8 iogcc backpressure testing of gas wells stabilized multipoint test shutin pressure wells with a pipeline connection should be produced for a sufficient length of time at a flow rate large enough to clear the well bore of accumulated liquids prior to the shutin period. Well testing programme when the rig reaches total depth td and all the available data is analysed, the company reservoirexploration departments shall provide the company drillingproduction and engineering departments with the information required for planning the well test type, pressure, temperature of.
Well test analysis model, resistance force on interface, open fracture, composite reservoir, laplace transform. To understand the fundamental principles of well testing 2. In a production flow test, the well is flowed through a test separator or a multiphase flow meter mpfm. Not only are evergreen subjects, such as layered reservoirs, naturally fractured reservoirs, and wellbore effects, covered in depth, but newer developments, such as well testing for horizontal wells, are covered in full chapters. Introductory well testing 9 preface 1 preface while there are many excellent and important books on the subject of well testing, few provide an introduction to the topic at the very basic level. To be able to interpret the results of well test analysis 4. For non oil and gas related jobs give minimum details.
For newly completed wells, surface equipment to store reservoir fluid may. The priorities of the wells team are to maintain well integrity, avoid hurting anyone and deliver the well on time and in budget. Tests of all different sorts are a regular part of running a lease pumping operation. This data is also used to calculate bottomhole pressures 3. An average measured rate is reported, along with wellhead and bottomhole pressure values. To understand this important discipline, welltesting experts have developed definitions ranging from average reservoir pressure to dst and well interference testing. Surface well test cleanup well testing schlumberger. Drill stem test well cleanups well production testing supply 4 or 5 station to realize remote control pnuematic actuated hydraulic pump is adopted able to control several valves at same time manual pump is used as back up. The use of transient well testing for determining reservoir parameters and productivity of horizontal wells has become common because of the upsurge in horizontal drilling. In most reservoirs, the formation pressure is adequately high to maintain a complete column of fluid in the borehole and track the pressure at the.
Well testing, well test analysis by uzo nwamu msc dissertation academic supervisor. Well test objectives exploration well on initial well, confirm hc existence, predict a first production forecast dst. The main objective of drilling a well is to test and evaluate the target formation. Oil and other products of the well need to be tested before theyre sold, as well as to determine the effectiveness of things like chemical treatment. Timely, comprehensive collection and dissemination of well testing data is a key mandate of the commission. Outcomes of a well test, for instance flow rate data and gas oil ratio data, may support the well allocation process for an ongoing production phase, while other data about the reservoir capabilities will support reservoir management. Introduction to well testing by ned spe student chapter issuu. Well test analysis for wells produced at a constant pressure. Injection well testing is the testing of a well by injecting fluid into the reservoir. While most private water wells in wisconsin provide safe drinking water, some may become contaminated with bacteria and other contaminants that are not filtered out when the water soaks into the ground. Private well testing act pwta required when selling or leasing a home or multiunit dwelling with private well. Statutory and regulatory authority private well testing act, n. Well testing is the execution of the set of activities of planned data acquisition for broadening the understanding and knowledge of the properties of reservoirs containing hydrocarbons.
The distinctive feature of the works mentioned is that virtually all the techniques for well test data interpretation are based on the singlephase flow theory. The activity starts after having drilled and logged the last open hole section. Here we present well testing procedures based on the creation of twophase bidirectional fluid flows in the vicinity of a well. Well test validation well test validation and model update modelbased production optimization requires continuous updating of well performance models that are related to the latest well test validations and model updates. Development well cleanup and well unloading services. This document contains information and guidance on home water testing. After the initial pressure test required under this section, the operator shall conduct a pressure test of the casing of a partially plugged well at least once every 60. This handbook covers all the major operational aspects of oil and gas well testing and uses a structured approach to guide the reader through the steps required to safely and effectively plan a well test operation under just about any circumstances world wide. Often, downhole pressures and temperatures, surface. As a private well owner, you are responsible for regularly testing your well water. Well test data collection and validation and model validation update are tasks that can be automated to relieve engineers from spending continue reading. There are no strict criteria governing the maximum volume to be produced or the duration of an extended well test and the duration may be extended if there is a technical justification. Clarification of individual water supply system testing.