运用产量构成法评估低渗致密气藏SEC储量——以大牛地气田DK13区块为例

SEC reserves in low permeability tight gas reservoirs by yield composition method——by taking DK13 block of Daniudi gas field as an example

大牛地气田一直以来采用整体单元递减法评估SEC储量,随着气田开发的不断深入,受开井数、措施、限产等因素的影响,无法确定合理的整体单元递减率,SEC储量评估结果失真。通过将评估单元开发井按投产时间和井型划分为不同的产量构成单元,包括稳定老井、不稳定老井和新井,分别进行天然气产量预测,最终叠加得到评估单元的整体产量,该方法能够消除选取合理递减率的不利因素。应用产量构成法重新评估大牛地气田DK13区块的SEC储量,充分反映了井型、投产年限、限产等因素的影响,使标定结果更及时反映单元的实际开发状况。

In Daniudi gas field,the overall unit decline method has been used to evaluate SEC reserves,with the development of gas field,the reasonable overall unit decline rate cannot be determined due to the influence of flowing well numbers,measures,production limit and other factors,and the result of SEC reserves evaluation is distorted.By dividing the development wells of assessment units into different production components according to the production time and well types,including stable existing wells,unstable existing wells and new wells,natural gas production is predicted respectively,and the overall output of assessment units is finally obtained by superposition.This method can eliminate the adverse factors of selecting reasonable decline rate.The SEC reserves in block DK13 of Daniudi gas field are reevaluated by using the yield composition method,which fully reflects the influence of well types,production life,production limit and other factors,and makes the calibration result more timely reflect the actual development status of the units.