| Sulige is the main gas field of Changqing Oilfield,which the geological structure is tight sandstone.There are more than 1000 horizontal wells in Sulige gas field at the end of 2015.Horizontal well production capacity accounted for more than half of the total annual production capacity,but the production time of the horizontal well is short,the production is decreasing quickly,and the decreasing feature is not clear.At the same time also need to have a more comprehensive understanding of the horizontal wells in Sulige gas field production capacity.The dynamic analysis of 162 fractured horizontal wells which had been completed more than 500 days is studied.162 wells are divided into three types by the rule of dynamic and static standard.Methods and processes for rational allocation of production are established based on the study of AOF and single well controlled reserves.In the following,the research on the law of decreasing typical wells is carried out and the production of all kinds of horizontal wells index is predicted.In the end,the factors affecting the stability of horizontal wells are studied.The final results are as follows:1.Fast evaluation chart of horizontal well dynamic reserves are drawn which can achieve rapid calculation in the early stage of production.2.A point method formula of horizontal well in Surge gas field is established which based on the data of modified well test.The chart of AOF has been established.3.Methods and processes for rational allocation of production are established based on the study of AOF and single well controlled reserves.4.The dynamic and static criteria for the classification of horizontal wells are established.5.The initial pressure drop of the horizontal well is relatively fast,and the latter becomes slow.The initial decline rate of the three kinds of wells was 35%,37% and 40%.6.The productivity of horizontal well is influenced by the geological and engineering factors. |
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