煤田地质与勘探
煤田地質與勘探
매전지질여감탐
COAL GEOLOGY & EXPLORATION
2015年
1期
30-34,42
,共6页
谢向向%张玉贵%姜家钰%张大伟
謝嚮嚮%張玉貴%薑傢鈺%張大偉
사향향%장옥귀%강가옥%장대위
钻井液%煤心煤层气%损失量%液置气%水锁%解吸
鑽井液%煤心煤層氣%損失量%液置氣%水鎖%解吸
찬정액%매심매층기%손실량%액치기%수쇄%해흡
drilling fluid%coal core CBM%loss quantity%liquid-replaced gas%water locking%desorption
为了准确求取钻井液作用下煤心煤层气解吸损失量，借助物理化学、界面化学、表面浸润、浸润相变和煤化学等理论，并通过相关实验研究，讨论了游离态煤层气对解吸损失量的影响，探讨了钻井液作用下液置气和水锁现象对煤层气解吸机理的影响。结果表明：在钻井液作用下，煤心煤层气解吸是多因素动态耦合作用的结果，煤层气原始压力、煤结构破坏类型、粒度、煤级、提钻速度和装罐时间是影响煤层气解吸损失量的主要因素；另外，煤心煤层气在钻井液和空气两种介质中有置换解吸、变压解吸和常压解吸3种解吸过程。
為瞭準確求取鑽井液作用下煤心煤層氣解吸損失量，藉助物理化學、界麵化學、錶麵浸潤、浸潤相變和煤化學等理論，併通過相關實驗研究，討論瞭遊離態煤層氣對解吸損失量的影響，探討瞭鑽井液作用下液置氣和水鎖現象對煤層氣解吸機理的影響。結果錶明：在鑽井液作用下，煤心煤層氣解吸是多因素動態耦閤作用的結果，煤層氣原始壓力、煤結構破壞類型、粒度、煤級、提鑽速度和裝罐時間是影響煤層氣解吸損失量的主要因素；另外，煤心煤層氣在鑽井液和空氣兩種介質中有置換解吸、變壓解吸和常壓解吸3種解吸過程。
위료준학구취찬정액작용하매심매층기해흡손실량，차조물이화학、계면화학、표면침윤、침윤상변화매화학등이론，병통과상관실험연구，토론료유리태매층기대해흡손실량적영향，탐토료찬정액작용하액치기화수쇄현상대매층기해흡궤리적영향。결과표명：재찬정액작용하，매심매층기해흡시다인소동태우합작용적결과，매층기원시압력、매결구파배류형、립도、매급、제찬속도화장관시간시영향매층기해흡손실량적주요인소；령외，매심매층기재찬정액화공기량충개질중유치환해흡、변압해흡화상압해흡3충해흡과정。
In order to accurately calculate the loss of CBM under the effect of drilling fluid, in this paper, with the help of physical chemistry theory, interfacial chemistry theory, surface wetting theory, wetting transition theory, coal chemistry theory and so on, meanwhile through the relevant experiment, the influence of free CBM on loss quantity was discussed. The influence of ' liquid-replaced gas' and ' water locking' phenomena on the desorption mechanism of CBM under the effect of drilling fluid was investigated. The results show that CBM desorption of coal core is the result of dynamic coupling of multi-factors under the effect of drilling fluid. CBM in-situ pressure, failure type, granularity, coal rank, core-hoisting velocity and canning time are the main factors influencing the desorption loss of CBM. Furthermore, CBM of coal core have three kinds of desorption process in the medium of drilling fluid and air:displacement desorption, variable pressure desorption, atmospheric pressure desorption.
