Post-evaluation Of Crude Oil Production Capacity-building Project Of ZL Oil Field

Oil and natural gas industry, especially in the upstream oil and gas exploration and development projects, with many uncertainties, large investment and high risk to carry out post-project evaluation, project objectives, implementation, effectiveness and impact evaluation system to analyze and sum up the success of experience, identify the reasons for the failure is particularly necessary.ZL oilfield in development since 1986, since 1988 oil production in 2000 were 300,000 tons in more than 13 years to achieve continuous and stable. Year 2001-2003 annual planning the deployment of 892 development wells, the use of oil reserves 4715×104t, so that ZL oil fields reach an annual output of 100×104t. ZL crude oil production capacity-building projects of the early post-evaluation work, various types of engineering (resources, program deployment, drilling engineering, production engineering, ground engineering), production run, the economic benefits such as the overall evaluation. Can be seen through the evaluation, ZL capacity building oilfield exploration and development project is a model of integration.Post-evaluation of resource conditions. Direct use of water-drive characteristic curve and decline curve method 2001-2003 estimated recoverable reserves of oil, calibration results ZL old oil field in 2001 the demarcation of recoverable reserves of oil 436×104t, recovery 33.4%; in 2002 the demarcation of recoverable reserves of 467×104t, recovery 35.8%. Compared with the program in 2001 to increase recoverable reserves 77×104t, 2002 recoverable reserves increase 31×104t.Post-evaluation of deployment of development programs. ZL crude oil production capacity-building project (2001-2003) the actual production capacity in line with the rate of 93.5 percent, the maximum annual production rate was 96.4%, in line with the basic program design; actual production capacity in program design and make any mistakes, mainly Due to the sensitive portion of the project area is located in the area of environmental protection without the use of the scale.Post-evaluation of the drilling program. The number of new drilling program design 863, 788 actually completed, in line with the rate of 91%, 85% and 95%. Design Design footage 1,499,900 meters, the actual 1,382,200 meters, in line with the rate of 92%, 85% and 95%. Drilling program design costs 1099 yuan / m, the actual 1158 yuan / m, the actual drilling program costs and 5.4 percent deviation in between 5 and 15%. Program of scientific drilling, process control in place in time, organization and management of closely detailed and serious acceptance of settlement, to maintain a high level of engineering quality, to meet the development requirements. Post-evaluation of Oil Production engineering. Production targets and the actual difference in the larger design, which single-well program on the design of oil production of 5.3 tons / day, in fact 5.8 tons / day;Ⅰ# East single-well injection of water, design of 44 square / day, the actual 47 side / days,Ⅱ# East single-well injection of water, design of 38 square / day, the actual 33 to / day, from the above indicators of technology and production analysis, production engineering program and the actual design and development indicators have a certain bias.Post-evaluation of the Device of Surface programs. ZL years 2001 -2003 crude oil production capacity-building project is part of the ground engineering fields important to the integration of exploration and development results, through the use of "dozens of new technologies, the five new equipment, new materials", reached the "two optimization, five a combination of four short and two use ", the realization of the" unmanned station "," transfer station, the Joint Station confined the whole "new goals, the whole project economically reasonable and technically advanced, after three years of operation so that annual production capacity of ZL field 30×104t / a up to 100×104t / a. Designed to strictly enforce the relevant standards, norms, process the application of the more advanced and mature technology, construction management norms, the project quality.Post-evaluation of the production run. Project the overall level of production: the new three-year one million tons capacity, the main engineering and systems engineering have reached the level of one million tons of production so that production of crude oil on ZL oil in 2000 from 800 tons up to 2730 tons in 2002. To build a new joint station, seven transfer stations, 48 valve, the expansion and transformation of a joint stations, five water stations, a substation, 820 oil wells, fully meet the needs of oil field development.Post-evaluation of Environmental impact. Development process, in order to correctly handle resource development and the relationship between ecological and environmental protection, adopted a series of technological measures, the use of glass instead of iron pipe line pipe, pumping units from orange to red (warning colors) to brush for now green color (green or blue), the construction of artificial wetlands, etc., will ZL oil field development on the natural environment and minimizing the impact, and strengthen the management of ground-based construction equipment, strict control of man-made pollution incidents.Post-evaluation of economic benefits. ZL crude oil production capacity-building project (2001-2003) After years of production, from the actual internal rate of return achieved, the financial net present value and payback period analysis, such as economic indicators, ZL actual oil field development has been very good economic benefits, and programs is much higher than predicted.Evaluation of the highest point before the actual annual output of oil, the cumulative oil production of goods and the achievement of the completion of program design, respectively 96%, 95% and 95%. The project after several years of actual production operations to achieve overall efficiency and effectiveness indicators for the financial internal rate of return 28.21%, financial net present value for the total investment 999.92 million yuan, investment recovery period is 4.27 years, the above three indicators of the program than 15.17% , 222.88 million yuan and 6.42 years, and in particular the increase in net present value reached 349%, the overall economic benefits of the program is expected to more than good, and from the project's internal rate of return for the benchmark rate of return of 12% uncertainties marginal value analysis, there is no risk of the project is now to recover their investments. ZL oil production capacity of one million tons to invest 24.16 billion yuan, 181 unit development cost yuan / ton, the cost of drilling for 1158 yuan / m, the internal rate of return of 28.21%, 167 units of net present value of yuan / ton, more than efficiency indicators have reached or even exceeded the company shares the benefits of a similar level of oil field development. As a result of the deployment of digital reservoir wells, drilling, oil and ground exploration projects closely tracking the development and construction of dynamic, timely analysis, timely research, timely adjustment of saving a great deal of investment, to enhance the economic benefits of the project.Based on the above evaluation results, in the ZL oil field development projects, the successful method used, because the more successful method is simple, has a strong operational. Comprehensive evaluation of the project decision-making for the A-level grades, scores for sub-8.66; comprehensive evaluation of the geological reservoir engineering for the B grade level, scores for sub-7.77; comprehensive evaluation of drilling projects for A-level grades, scores for sub-8.28; production engineering A comprehensive evaluation of grade level, scores for sub-8.67; comprehensive evaluation of the ground works for the A-level grades, scores of 9.5 points; comprehensive evaluation of production levels for the B-class, value for the 7.08 pm; comprehensive evaluation of economic efficiency rating A grade, scores for sub-8.10; the impact of comprehensive evaluation and continuous evaluation for A-level grades, scores of 8.9 points; Based on the above points in various parts of the results of the successful application of evaluation method, after calculating the production capacity of crude oil ZL construction projects ( 2001-2003) for the comprehensive evaluation score 8.37, belonging to A-(excellent).The resulting capacity building in the field of the final conclusions: First, crude oil production capacity ZL construction project (2001-2003) the first time, supporting the formation of oil fields in a complete, integrated exploration and development of a mature pattern of development, the evaluation of conservation investment, capacity to shorten the construction period. Second, crude oil production capacity ZL construction project (2001-2003) in the sensitive area of environmental protection, resulting in some blocks there is no scale to use, coupled with the reservoir type and complexity of geological conditions, resulting in the actual size and design of production have a certain bias, but the project has achieved good results and economic benefits of development, the development of oil fields for the same accumulated valuable experience. Third, through a bold introduction and application of advanced and mature technology and the development of mining technology and advanced management technology, to promote the effective development of marginal oil reservoirs to better control the process of building the investment and the cost of the actual development of the project post-evaluation cost of 2.94 U.S. dollars / barrel, than the plan of development costs 3.63 U.S. dollars / barrel dropped by 19%.