A temporary well completion to gather information on the potential productivity of a formation. Conventional drillstem testing dst is a proven and costeffective means of evaluating a well. Pdf analysis of drill stem test john ansa academia. 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. Drillstem test data analysis considering inertial and. Principal drill stem test database ubdst and documentation. Protest offers the following drill stem testing capabilities. Pdf in the paper results of dst tests obtained in two wells at osobnica oil field are presented. Drill stem test dst is one of the most famous onsite well testing that is used to unveil critical reservoir and fluid properties such as reservoir pressure, average permeability, skin factor and well potential productivity index.
The procedures listed below may be followed by operating company personnel to improve drill stem testing safety on their rigs. Analysis of drill stem test dst results at osobnica oil field, in terms of sampling of selected technology parameters. Pdf analysis of drill stem test dst results at osobnica oil field. With close links to our long established subsea product line development group, a dedicated dst engineering team guided by seasoned professionals, work together inhouse to develop and introduce innovative dst tools. Dst tcp drill stem testing tubing conveyed perforating. This seminar paper will present methods for the quantitative analysis of drill stem test. Protest has oilfieldstyle inflate drill stem testing tools for testing open hole sized from 156mm 618 and larger. Below are charts that depict the pressure graph with respect to time during different situations in dst. A well testing technique used to quantify the productivity of the wells to allow development and completion plans. The zone in question is sealed off from the rest of the wellbore by packers, and the formations pressure and fluids are measured. Special procedures for the analysis of slug and drillstem tests when the produced fluid does not reach the surface have appeared in the literature over the last ten years. Subsequently, analysis of the wireline logs and drill stem test data substantiated the information provided by the hydrocarbon detection unit.
Drill stem test dst valve petroleum reservoir scribd. The test is an important measurement of pressure behaviour at the drill stem and is a valuable way of obtaining information on the formation fluid and establishing whether a well has found a commercial hydrocarbon reservoir. It is relatively cheap onsite test that is done prior to well completion. All well files are available, except for confidential wells or confidential information. Analysis of a slug test or drill stem test for linear flow. The basic drill stem test tool consists of a packer or packers, valves or ports that may be opened and closed from the surface, and two or more pressurerecording devices. It consists of a combination of a packer arrangement and drill pipe or tubing. Equation box adobe pdf format54,102 bytes a new early formation pressure system efps combines the advantages of a drill stem test dst and a wire line formation tester wft and provides a. A drill stem test dst is a procedure for testing the wellbore pressure. Well data submission requirements directive png0 sets out the requirements for the submission of well data for drilling, completion, workover and abandonment.
Conventional drill stem tests are seldom utilized in geopressured offshore oil fields for fear of well control problems. The usgs does not support this software or technical questions for the software associated with the publication. Guidance specific to the injectivity test is provided in attachment 4. What is a drill stem test dst and what data is attainable. Upon completion of the test, the entire arrangement is withdrawn from the well. Completion production test drill stem test dst 1 4. A drill stem test dst is some form of temporary completion of a well that is designed to. Overview drill stem testing dst is a procedure to determine the potential productivity, pressure, permeability or extent of an oil or gas reservoir before the permanent. The presented case histories of analyses of characteristics of reservoir rock from drillstem tests illustrate that drillstem test analysis may be used to evaluate a formation within the vicinity.
Drill stem testing consists of running a suite of tools on drill pipe and then isolating a section of the open hole for the purpose of evaluating the well. Drill stem test dst drill stem testingdst drill stem. The most common test sequence consists of a short flow period, perhaps five or ten minutes, followed by a buildup period of about an hour that is used to determine initial reservoir pressure. With an established track record of esp system success, the artificial lift team offers operators an early understanding of reservoir mechanisms, determination of essential reservoir properties and pressures, and capturing of samples for pvt analysis. A drill stem test dst is a procedure for isolating and testing the pressure, permeability and productive capacity of a geological formation during the drilling of a well. The procedures listed below may be followed by operating company personnel to improve drill stemtesting safety on their rigs. A conventional dst is run on the end of the drill string immediately after a zone of interest has been drilled through. Before any drill stem test, conduct a safety meeting of all personnel participating in the test. Pdf one of the most important stages of completing a well is discussed in this report. In the case of the hamilton brothers cherhill well, there were neither physical nor temporal problems in obtaining conventional wireline logs and drill stem test data. The present techniques of using the drillstem test as a formation evaluation tool are discussed.
There are essentially no standard ascii dst data files formats existing that will allow the user to read and process dst data. New technology drill stem testing technology expro. Drill stem test dst free download as powerpoint presentation. The well files are scanned into adobe pdf documents that include all forms, letters, geological reports, drill stem test reports, core analysis reports, and other miscellaneous information. Expro is committed to advancing technology in the field of drill stem testing dst and our investment is driven by the requirements of existing and emerging growth markets.
As originally conceived, a drillstem test provided primarily an indication of formation content. Status of drillstem testing techniques and analysis. In order to evaluate a wells productivity there are number of direct and indirect tests but dst or drill stem test is the most authentic test of them all. Drill stem tests dsts are a type of bottom hole buildup test.
These tools are proven in the field with a high reliability and are. Input data required for well test analysis test data flow rate. Drill stem test a drill stem test dst is a temporary completion of a wellbore that provides information on whether or not to complete the well. The scope is to define the quality of the formation fluid. Drillstem testing dst is one of the most important completion techniques.
Our entire log inventory has been scanned into tiff image format. It is a test commonly used to test a newly drilled well. What is drill stem test pressure chart dst pressure chart. This is followed by a flow period of 4 to 24 hours to establish stable flow to the surface, if possible, and followed by the final shutin or buildup test. Each year, the offshore technology conference otc recognizes. Drill stem testing drill stem test dst is used primarily to determine the fluids present in a particular formation and the rate at which they can be produced. Expro is one of the most experienced international well testing companies in the world and an established provider of drill stem testing dst services to the oil and gas industry. This is a short term test which uses a combination of drillpipetubing and downhole tools to evaluate the reservoir.
This java applet allows the user to enter or import drill stem test dst data directly into the program. One of the most important stages of completing a well is discussed in this report which is the drillstem testing dst. Expired lifetime application number inventor jensen lloyd current assignee the listed assignees may be inaccurate. The one day test, usually a few hours in extent, produces fluids and creates a short term pressure draw down for reservoir evaluation. Well data submission requirements october 2016 page 6 of 31 1 introduction directive png0. Drillstem tests are usually made for one or both of the following reasons. Done during the drilling of wells, provides both samples of reservoir fluid and estimates of reservoir properties. The tool is lowered on the drill string to the zone to be tested. After the operator determines that a formation test is to be conducted, the test tool is assembled and lowered into the wellbore. 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. They are run during or after the drilling of a well, but before casing installation. Closed chamber well test analysis by superposition of the.
Drillstem tests drillstem test data are presented in the drillstem test data section in tables 111. Mining drill stem tests for fluid data john r forster1 1 the wetterhorn company, centennial, co dsts are short term open hole production tests, run while drilling, to evaluate potential producing zones. Drill stem testing, dst drill stem testing provides a method of temporarily completing a well to determine the productive characteristics of a specific zone. The data derived from the drill stem test dst give a computation of the formations permeability, damage ratio, productivity index, transmissibility and radius of investigation. Analysis of drill stem test is performed by drill stem test pressure charts. After the well has been drilled and cased, the first stage of a well test is to run a dst string in conjunction with a downhole data system with the. Halliburton improves on the technique by integrating existing technology with recent developments in dst tools and sampling technologies. Analysis of flowing dsts is less complicated because flow rates can be measured throughout the test. Google has not performed a legal analysis and makes no. Valves are present in this arrangement to open and close the tool, and pressure and temperature recording devices are employed. This report discusses three main aspects of this technique, it indicates the detailed function of each component of the tool. Tam provides customengineered packers for dependable and efficient testing operations. The presented case histories of analyses of characteristics of reservoir rock from drill stem tests illustrate that drill stem test analysis may be used to evaluate a formation within the vicinity.
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