摘要
国外的经验表明，应选择煤层稳定，单层厚度大（＞０．６ｍ）．煤层埋藏浅（＜１０００ｍ），煤层物性好，裂隙发育。含气量较高（烟煤或半无烟煤）的煤层做为煤层气勘探开发的对象。最优化压裂设计是增产的关键，国外目前已建立了一批适于煤层气井的压裂软件，可供我们借鉴。应根据煤层的地质特征，选择合适的压裂液和支撑剂：冻胶压裂液适于高渗透煤层，清水压裂液适于低渗透煤层。作者也曾研制出了两种适于压力系数为１．温度为２０℃左右煤层的压裂液。新疆聚煤盆地发育，侏罗系煤炭资源十分丰富。尤其是准噶尔盆地南缘地区煤层厚度大，煤岩热演化程度高，已达气煤阶段，煤层气资源的开发利用有着广阔的前景。
It is shown from foreign experiences that the coal seams with little change, large individual layer thickness (0.6m) . shallower burial. better coalbed properties. fractures widely distributed, and high gas content (bituminous coaland semianthracite)should be chosen as candidates for coalbed gas exploration and development. The optimized frac-turing designs are the key to stimulation. The fracturing softwares applicable for coalbed gas well have been designedabroad .which can be used for reference. Appropriate fracturing fluids and proppants should be selected upon the geo-logical characteristies of coalbed. Gel fracturing fluid is applicable for high permeability coalbeds.while fresh waterfracturing fluid is more applicable for low permeability ones. Two fracturing fluids applicable for the coalbeds withpressure coefficient of 1 and temperature of about 20℃ have ever been developed. Coal basins in Xinjiang exist inlarge amounts in which coal resources are rather rich in the Jurassic. particularly in southern margin of Jungsar Basin.which is characterized with thicker coalbed and high degree thermal evolution (gas coal) . Development and utilizationof coal and gas resources have broad a prospects.
出处
《新疆石油地质》
CAS
CSCD
北大核心
1994年第1期87-90,共4页
Xinjiang Petroleum Geology
关键词
煤层气
气井压裂
勘探
开发
增产
coalbed gas Exbloration and production Gas-well fracturing.
