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水电钻探不同于工民建、地质矿产、煤田等勘探的是钻孑L除取芯外,还要用于水文地质试验。常见水文地质试验有水位观测、抽水试验、压水试验,主要是测试地层的渗透性。这就要求在冲洗液的使用上进行必要的选择,相应规范中都规定不能使用泥浆钻孔,这往往与钻探中护胶固壁相矛盾。实践中,采用分清主要目的的方法,基本上能处理好这一矛盾。如取芯为主的钻孔,选用SM泥浆或无固相泥浆,取好岩样;而在试验为主的钻孔中,严禁使用泥浆,保证试验资料的真实性。
Hydroelectric drilling is different from the workers and civil engineering, geology and mineral resources, coal exploration and other exploration is drilling larvae L addition to coring, but also for hydrogeological tests. Common hydrogeological test water level observation, pumping test, water pressure test, mainly to test the permeability of the formation. This requires the use of flushing fluid to make the necessary choices, the relevant provisions of the regulations are not allowed to use drilling mud, which often contradict the plastic wall in drilling. In practice, adopting a method of distinguishing the main purpose can basically handle this contradiction. Such as coring-based drilling, the choice of SM mud or solid-free mud, take a good rock sample; and in the pilot-based drilling, the use of mud is strictly prohibited to ensure the authenticity of the test data.