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Lost circulation in geothermal wells: survey and evaluation of industry experience

Description: Lost circulation during drilling and completion of geothermal wells can be a severe problem, particularly in naturally fractured and/or vugular formations. Geothermal and petroleum operators, drilling service companies, and independent consultants were interviewed to assess the lost circulation problem in geothermal wells and to determine general practices for preventing lost circulation. This report documents the results and conclusions from the interviews and presents recommendations for needed research. In addition, a survey was also made of the lost circulation literature, of currently available lost circulation materials, and of existing lost circulation test equipment.
Date: July 1, 1981
Creator: Goodman, M.A.
Partner: UNT Libraries Government Documents Department

Wellbore and soil thermal simulation for geothermal wells: comparison of geotemp predictions to field data and evaluation of flow variables. Part II report

Description: A better understanding of temperatures in a well is needed to improve casing selection, cement design, drilling fluid formulation, packer selection, and many other aspects of well design. Two applications of GEOTEMP are presented which provide the calculations needed. First, the results of testing GEOTEMP predictions with analytical solutions and with field temperature data are presented. And second, sensitivity studies establish the importance of certain well variables on downhole temperatures. (MHR)
Date: January 1, 1980
Creator: Wooley, G.R.
Partner: UNT Libraries Government Documents Department

Wellbore thermal simulation for geothermal wells. Survey of existing capability and industry needs and interest

Description: Four operating companies and five service companies in the petroleum and geothermal industry were contacted (1) to determine needs for wellbore temperature predictions during operations and (2) to evaluate interest in use of a wellbore thermal simulator (computer program) if developed by ERDA. As a basis for contacting industry, a literature survey was undertaken to assess the state-of-the-art and availability of wellbore thermal simulation capability. The literature review is summarized in the four tables of Appendix 1. Written abstracts of the individual articles is given in Appendix 2. The feedback from industry is presented in Appendix 3 in the form of completed questionaires.
Date: June 1, 1977
Creator: Goodman, M.A.
Partner: UNT Libraries Government Documents Department

Wellbore and soil thermal simulation for geothermal wells: development of computer model and acquisition of field temperature data. Part I report

Description: A downhole thermal simulator has been developed to improve understanding of the high downhole temperatures that affect many design factors in geothermal wells. This development is documented and field temperature data presented for flowing and shut-in conditions.
Date: March 1, 1980
Creator: Wooley, G.R.
Partner: UNT Libraries Government Documents Department

User's manual for GEOTEMP, a computer code for predicting downhole wellbore and soil temperatures in geothermal wells. Appendix to Part I report

Description: GEOTEMP is a computer code that calculates downhole temperatures in and surrounding a well. Temperatures are computed as a function of time in a flowing stream, in the wellbore, and in the soil. Flowing options available in the model include the following: injection/production, forward/reverse circulation, and drilling. This manual describes how to input data to the code and what results are printed out, provides six examples of both input and output, and supplies a listing of the code. The user's manual is an appendix to the Part I report Development of Computer Code and Acquisition of Field Temperature Data.
Date: March 1, 1980
Creator: Wooley, G.R.
Partner: UNT Libraries Government Documents Department

Advanced wellbore thermal simulator: GEOTEMP2 user manual

Description: GEOTEMP2 is a wellbore thermal simulator designed for geothermal well drilling and production problems. GEOTEMP2 includes the following features: fully transient heat conduction, wellbore fluid flow options, well completion options, and drilling-production histories. The data input format is given, along with input examples and comments on special features of the input. Ten examples that illustrate all of the flowing options and input options in GEOTEMP2 are included.
Date: February 1, 1982
Creator: Mitchell, R. F.
Partner: UNT Libraries Government Documents Department

Advanced wellbore thermal simulator GEOTEMP2. Appendix. Computer program listing

Description: This appendix gives the program listing of GEOTEMP2 with comments and discussion to make the program organization more understandable. This appendix is divided into an introduction and four main blocks of code: main program, program initiation, wellbore flow, and wellbore heat transfer. The purpose and use of each subprogram is discussed and the program listing is given. Flowcharts will be included to clarify code organization when needed. GEOTEMP2 was written in FORTRAN IV. Efforts have been made to keep the programing as conventional as possible so that GEOTEMP2 will run without modification on most computers.
Date: February 1, 1982
Creator: Mitchell, R.F.
Partner: UNT Libraries Government Documents Department

Temperature histories in geothermal wells: survey of rock thermomechanical properties and drilling, production, and injection case studies

Description: Thermal and mechanical properties for geothermal formations are tabulated for a range of temperatures and stress conditions. Data was obtained from the technical literature and direct contacts with industry. Thermal properties include heat capacity, conductivity, and diffusivity. Undisturbed geothermal profiles are also presented. Mechanical properties include Youngs modulus and Poisson ratio. GEOTEMP thermal simulations of drilling, production and injection are reported for two geothermal regions, the hot dry rock area near Los Alamos and the East Mesa field in the Imperial Valley. Actual drilling, production, and injection histories are simulated. Results are documented in the form of printed GEOTEMP output and plots of temperatures versus depth, radius, and time. Discussion and interpretation of the results are presented for drilling and well completion design to determine: wellbore temperatures during drilling as a function of depth; bit temperatures over the drilling history; cement temperatures from setting to the end of drilling; and casing and formation temperatures during drilling, production, and injection.
Date: July 1, 1981
Creator: Goodman, M.A.
Partner: UNT Libraries Government Documents Department