煤层气羽状水平井的开采优化

羽状多分支井在煤层气开采中具有巨大的潜力，其井型的优化布置是多分支井成功开发煤层气的关键。目前在煤层气羽状多分支井产能预测和井型优化这方面的研究并不多，给现场生产造成了困难。为此，以多分支井产能数值计算方法为基础，研究了多分支井的分支角度、分支间距和分支长度对产能的影响。结果发现：为了获得较高的产能，多分支井的井筒应垂直于最大主渗透率方向；对于给定的煤层气藏，存在一个最优的分支间距，既能保证较大的控制面积，又能保证分支间的互相影响；随着分支长度的增高，产气量也显著增大，但是考虑到煤层边界和井筒压降的影响，分支长度也应该有一个比较合理的值。

Optimization of pinnate horizontal multilateral wells for coalbed gas recovery

Pinnate horizontal multilateral wells have great potential in the exploitation of coalbed methane,the result of which lies in well pattern optimization.However,much trouble arises in field production of pinnate horizontal multilateral wells for lack of references from present studies on productivity predication and well type optimization.Therefore,based on numerical calculation of a multi-branch well's productivity,the influences of the branch angle,branch interspaces and branch length on the gas yield are ...