Study On Gas Well Deliverability Evaluation And Production Proration For Block Wangshen1 Volcanic Gas Reservoir

Based upon the review of the technical literature on gas well deliverability and production proration, this dissertation investigated the factors which could cause high productivity and rate maintenance capability. The emphasis is put on transient deliverability, stable deliverability, dynamic reserves and rational rate considering proration principle. The research results are as follow:1. The absolute open flows were calculated by single point deliverability equations and stable-point binomial deliverability equations in researched block without well test data. The applicable condition of single point method was discussed and result was reached that if the ratio of flow pressure to reservoir pressure is smaller than 0.7, the effect of a on flow potential is neglected and Chen's single point method can meet the need of early development evaluation. Compared with the results of two methods, their absolute open flows are almost equal as the ratio of flow pressure to reservoir pressure is smaller than 0.7.2. Due to the differences of gas well deliverability, gas wells were classified into II and III₁, their deliverabilities were evaluated and then new well absolute open flow will be predicted after deliverabilty equations were established.3. By non-stabilized well test interpretation and performance analysis, it's concluded that intensive reservoir heterogeneity, limited reservoir layer length, low dynamic reserves, rapid pressure falloffand poor rate maintenance capability.4. The rational rate is affected by gas well deliverability, dynamic reserves, years of stable production, reasonable producing pressure drop, critical liquid holup capacity and maximum gas rate. The first two is the key factors. Finally the class II gas wells are prorated above 15 Mstm/D, which are produced with 2³/₈" oil tubing by pressure booster stimulation. The class III₁ gas wells are prorated below 10 Mstm/D, which are produced with 1.5" oil tubing by pressure booster stimulation considering liquid holdup capacity.