Fuling Shale Gas Well Horizontal Section Control And Economic Evaluation

Domestic oil company usually is according towel history data, evaluators subjectively defined evaluation scope and the collection evaluation parameters, for example, whether the investment should be included in the scope of evaluation has always been a controversial problem in economic evaluation field, many scholars believe that should go to evaluation, but also other scholars think the existing investment should not be included in the evaluation; For the most basic parameters-reserves. Our evaluators basically using the method of determining the reserves value, artificially covers many risks leading the evaluation results not to be trusted. On the whole,There has existed many problems in the our economic evaluation of oil and gas resources lead to the evaluation results Inaccurate and unreliable.At present domestic use of traditional economic evaluation methods-Income approach, It is to be evaluated by the ratio of all capital investment and output to determine whether it is worthwhile to develop, All evaluation are used to calculate profitability, However, these indicators do not completely react during field development status of inputs and outputs with a strong subjective ideas, the results obtained are often very different from the actual revenues and productivity, at the same time such an evaluation model does not take into account the impact of oil and gas resources in the development process and the ecological environment, ignore the likely impact of the potential risks and there is no single comprehensive evaluation of the distribution function model, and the evaluation of the level of Western developed countries, a far cry from our oil companies.Given the current lack of domestic economic evaluation well drilling, in this paper, case history through cost well drilling company’s data and each individual wells, Last stratified analysis by calculating the optimal segment preferably BHA and drilling parameters out,and giving the Drilling costs and forecasts. For real needs,in this thesis, analysis of information on the history of finishing well,indicators will be needed to sort out some evaluation of the data given by the calculation method of the radar chart, These evaluation indicators to assess the economic return value drilling. The study includes the following:(1) Through calculation of the horizontal well production, to determine the optimum length of horizontal section, the optimal economic efficiency by drilling.(2) Fuling area drilling operation in complex cases, lost circulation accounts for a large proportion of the, through three pressure profile to predict fuling fuling stratigraphic area safe drilling fluid density window, combined with statistical accident data level section of the drilling fluid system and density are given(3) In the part of the economic evaluation to the radar in the principle of evaluation, in the process of evaluation, calculate the cost per unit footage of the well, the drilling cycle, penetration time unit, and then calculate a comprehensive index, comprehensive index is smaller, drilling the higher economic benefit...