Description: Das Projekt "Enhandced oil recovery-modification and continuation of the articulated drillstring" wird vom Umweltbundesamt gefördert und von Preussag, Abteilung Forschung und Entwicklung durchgeführt. Objective: Main purpose of the R and D project TH/02047/87/DE is the development of a short down hole motor based on the existing ADS-system (Articulated Drill String) with the same high accuracy of azimuthal and directional control. The usability of the new system to drill horizontal wells from small diameter casings has to be achieved. This target shall be reached by integration of short positive displacement motors into the ADS technology. In addition, drilling and production related technologies shall be developed to optimize the completion of horizontal wells in hydrocarbon reservoirs. General Information: The development consists of seven project stages related to three topics (subjects): 1. Articulated drill string (ADS). STAGE 1 : State - of - the - art report. STAGE 2: Modification of the existing drill string, adaption of mud motor and flexible drill pipe. STAGE 3 : Adaption of the flexible drill string components and 2-way EM-MWD system. 2. Flexible drill string. STAGE 4: State - of - the - art report. TAGE 5 : Construction and testing of flexible drill string components. 3. Completion and production methods. STAGE 6 : State - of - the - art report and theoretical solution of problems. STAGE 7 : Configuration, testing, modifications. Achievements: The new articulated down hole motor (ADM) was constructed and field-tested as a short positive displacement motor. After generally successful field-tests of the 4,75' and 6,75' version of the ADM, improvement and optimization work has to be done. The design of the articulations had to be changed twice. The support pads on the articulations were extended to improve the build-up performance of the ADM, particularly in soft formations and unconsolidated sands. The edging rings of the rubber sleeve had to be revised in geometry and finish to improve the adhesion of the vulcanized hose. The load capacity of the articulation was improved by the adjustment of the bearing surface. The increased interest in an ADM with a reduced diameter to get the ability to drill short radius horizontal wells with radii down to 20 m from all common 7' API casings will be satisfied by a new ADM with a diameter of 4,15 only. A MWD system which was developed by Preussag with a sponsorship of the German Ministry for Research and Technology is being modified to suit the requirements in short radius horizontal drilling. The now available MWD system shall be modified for use with the ADM in short radius horizontal drilling. In long horizontal sections it is difficult to create the necessary weight on bit. The weight on bit is produced by means do drill collars positioned in the vertical section of the borehole. The drill pipe located below the drill collars has to transfer the load to the bit. Under these conditions drag and buckling of the drill pipe is a problem. Up to now in horizontal sections usually heavy-wall-drill pipe (HWDP) is used due to their increased bending resistivity compared to conventional drill pipe. ..
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Hirsch ? Gummi ? Horizontalfilterbrunnen ? Alicyclischer Kohlenwasserstoff ? Ministerium ? Kohlenwasserstoff ? Pflanzensamen ? Brunnen ? Main ? Gemeinnützigkeit ? Belastbarkeit ? Sand ? Sponsoring ? Finanzierungshilfe ? Antriebstechnik ? Bohrkern ? Kapselung ? Kontrollsystem ? Motor ? Stand der Technik ? Verfahrenstechnik ? Vergleichsanalyse ? Höhle ? Horizontalbohrung ? Forschung und Entwicklung ? Adhäsion ? Freilandversuch ? Gemeinwohlorientierung ? Produktdesign ? Rohrleitung ? Abdichtung ? Bohrung ? Schadensregulierung ? Technische Aspekte ? Lagerstättenkunde ?
Region: Berlin
Bounding box: 10.44987° .. 10.44987° x 54.03573° .. 54.03573°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1988-01-01 - 1991-12-31
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