油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2012年
5期
78-82
,共5页
煤层气%产能%构造%压裂%排采%影响因素%延川南区块
煤層氣%產能%構造%壓裂%排採%影響因素%延川南區塊
매층기%산능%구조%압렬%배채%영향인소%연천남구괴
CBM%productivity%structure%fracture%drainage and gas recovery%influencing factors%South Yanchuan block
延川南区块作为中国石化第一个煤层气产建区块，目前已进入开发阶段。掌握该区煤层气井生产动态，确定其产能影响因素，对区块下一步规模化开发具有显著的指导意义。以延川南区块煤层气井生产动态为研究基础，综合运用统计、对比、数模方法，对该区煤层气排采井生产特征进行分类，分析影响该区煤层气井产能的主要因素。研究表明，该区煤层含气量对产能影响较大，而含气量受煤体结构影响显著；构造高部位相对高点及距断层200 m以上区域受含水层影响较小，有利于煤层气井排水降压，获得高产；水力压裂裂缝半长与单井产能具有一定关系；适宜的压裂液量和加砂量有助于提高煤储层渗流能力，促进煤层气产出；合理控制煤层气井初期排采强度，有助于煤层气井产能的提高。
延川南區塊作為中國石化第一箇煤層氣產建區塊，目前已進入開髮階段。掌握該區煤層氣井生產動態，確定其產能影響因素，對區塊下一步規模化開髮具有顯著的指導意義。以延川南區塊煤層氣井生產動態為研究基礎，綜閤運用統計、對比、數模方法，對該區煤層氣排採井生產特徵進行分類，分析影響該區煤層氣井產能的主要因素。研究錶明，該區煤層含氣量對產能影響較大，而含氣量受煤體結構影響顯著；構造高部位相對高點及距斷層200 m以上區域受含水層影響較小，有利于煤層氣井排水降壓，穫得高產；水力壓裂裂縫半長與單井產能具有一定關繫；適宜的壓裂液量和加砂量有助于提高煤儲層滲流能力，促進煤層氣產齣；閤理控製煤層氣井初期排採彊度，有助于煤層氣井產能的提高。
연천남구괴작위중국석화제일개매층기산건구괴，목전이진입개발계단。장악해구매층기정생산동태，학정기산능영향인소，대구괴하일보규모화개발구유현저적지도의의。이연천남구괴매층기정생산동태위연구기출，종합운용통계、대비、수모방법，대해구매층기배채정생산특정진행분류，분석영향해구매층기정산능적주요인소。연구표명，해구매층함기량대산능영향교대，이함기량수매체결구영향현저；구조고부위상대고점급거단층200 m이상구역수함수층영향교소，유리우매층기정배수강압，획득고산；수력압렬렬봉반장여단정산능구유일정관계；괄의적압렬액량화가사량유조우제고매저층삼류능력，촉진매층기산출；합리공제매층기정초기배채강도，유조우매층기정산능적제고。
As the first CBM productivity construction block of Sinopec, South Yanchuan block is under development at present. Knowing well about the production performance of CBM wells and ensuring the influence factors of productivity have obvious guid-ing significance to the next scale development. Therefore, base on the production performance, with the combination of method of statistics, comparison and numerical simulation, and Classifying the production characteristic of CBM drainage wells in this block, this paper analysed the main influence factors of CBM wells productivity in South Yanchuan block. The results shows that the gas content in the coalbed layers in this block has great effect on productivity, while the gas content is markedly affected by the coal structure. Relatively high position of the structure and the area above 200 meters of the faults that are less affected by the aquifer contribute to dewatering and depressurizing in order to obtain high productivity. Fracture half-length has a certain relationship with productivity. Meanwhile, suitable fracturing fluid volume and sand amount help to improve the permeability of coal seam and promote the output of CBM. And reasonable controlling of the initial drainage and gas recovery strength of the CBM wells also helps to improve the productivity.
