Abstract
Planning of the completion program of production casing and liner in geothermal wells is one of the important stages of a drilling and production program, the purpose of which is to minimize drilling and production problems from aspects of rock formation penetrated by drilling. As a comparison, the planning of production casing and liner completion in Oil and gas wells usually only considers factors of casing load and formation pressure, especially for the geothermal wells where the factors high temperature, corrosion rate of material and corrosion characteristics of production fluid as well as the location of the feed zone must be integrated in detail and simultaneously with casing loads and formation pressure. The higher temperature of the well will increase the corrosion rate of production casing and liner materials because it is continuously in direct contact with the hot fluid so that the material life of the production casing and liner decreases. The prediction of the corrosion rate of production casing and liner materials must be done in detail, so that the life of production casing and liner can be estimated based on the strength of the production casing and liner materials on the corrosion properties of the hot production fluids. The purpose of this study is to optimize the completion of the production casing and liner installed in reference wells (D#3 and D#4) for the completion programe of production casing and liner of the make-up wells (CCN # 4), so that its have a minimum age of 30 years production. The approach is to do data integration simultaneously, namely casing load, formation pressure, temperature, corrosion rate of material, corrosive properties of the production fluid and location of the feed zone. The results obtained are that the program of the optimum completion of the production casing and liner for make up well (CCN # 4), namely Conductor casing (0-30 mMD) grade X56-310ppf, Surface casing (0-340 mMD) grade K55-133ppf STC, production casing (0-1817 mMD) grade P110-72ppf STC, and perforated liner 10 ¾ “depth (1767-2355 mMD) grade N80- 40.5 ppf STC installed at 2 m from the bottom of the well.
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