丰庆泰 李平

(1．中国煤炭地质总局119勘探队，河北 056107;2．格瑞克能源(国际)公司，河南 450000)

煤层气水平对接井钻井技术研究

丰庆泰1李平2

(1．中国煤炭地质总局119勘探队，河北 056107;2．格瑞克能源(国际)公司，河南 450000)

水平对接井(SIS)由水平井与垂直井对接组成，并可根据地质条件和需要，设计成多口水平井与1口直井对接的多“U”型组合;其井身结构简单，尤其是完井后可下入一根高强度PVC筛管，克服因煤体坍塌、煤粉沉淀等原因可能造成的水平井段堵塞，还可对水平段井眼进行双向冲洗，保证采气阶段井眼的畅通。煤层气开发实践证明水平井可有效地导通煤储层的裂隙系统，增加气、水导流能力，大幅度提高单井产量和采收率，是开发低压、低渗地区煤层气资源的有效手段，而水平对接井以其合理的井身结构和独特的完井方式，更适宜于中国大多数煤储层条件的煤层气开发。

水平对接井 煤层气开发 地质导向 水平钻进

［HJ］Abstract:SIS consists of a horizontal well and a vertical well．Based on the requirements of the geological conditions and requirements，the author may design the well grouping as a“U”type assembly，consisting of a multiple of horizontal wells and a vertical well．The structure of wellbore is simple．Especially after well completion a high strength perforated PVC pipe can be lowered into the well to prevent the horizontal section from plugging due to collapsing of coal solid，or deposition of fine coal．Bidirectional flushing can also be carried out in the horizontal section of the borehole，so as to ensure smooth flow of gas in the production section of the borehole．Practical experiences obtained from development of CBM have proved that horizontal well can effectively connect the fracture system in coal reservoir．It can increase the diversion capacity of gas and water，and enhance to a great extent the production of a single well and recovery rate．It is an effective means to exploit CBM resources in low pressure，low permeability areas．SIS well due to its rational wellbore structure and unique completion method is more suitable for development of CBM in most coal reservoir conditions in China．

Keywords:SIS;development of CBM;geological guidance;horizontal drilling

中国大陆煤层形成后的地史时期，曾经受过多 期次强烈的地质构造运动，使多数煤储层的原生结构遭受了很大程度的破坏，决定了中国煤层气储层普遍具有三低一高(低压、低渗、低饱和及高含气量)的特点，在很大程度上限制了地面垂直压裂煤层气井的产量。而顺煤层水平井可有效地导通煤储层的裂隙系统，增加气、水导流能力，大幅度提高单井产量和煤层气采收率，缩短回收周期，是开发低压、低渗地区煤层气资源的有效手段。近年来，国内实施的大批煤层气羽状水平井(或多分枝水平井)获得了较大的成功，尤其是在沁水盆地南部，单井产气量最高已突破1.0×105m3/d，取得了很好的商业化开发效果。……