物探参数孔成井工艺及测井方法研究

Study on the Building and Logging Technological Innovation of the Geophysical Parameter Borehole

在砂岩型铀矿普查、详查或之后铀矿床的地浸开采工作中,需要确定镭氡平衡系数,用来修正γ测井解释结果或进行铀资源量估算。物探参数孔的成井质量是获取镭氡平衡系数准确性的关键。文章对目前参数孔的成井工艺及施工流程进行了详尽的阐述,并针对成井环节中的扩孔方式、套管底部封堵方法、后续γ状态观测次数和测井速度等存在的问题,提出改变扩孔顺序、改进封堵工艺、减少前期γ状态观测次数和提升非矿段测井速度的技改措施,防止原来成井时对变径止水段的破坏,避免了重复封堵或封堵效果不佳的情况出现,既提高了工程质量,又缩短了建井和观测时间,取得了工艺改进预期的效果,达到节能增效的目的。并通过实例验证了技改的合理性和可行性,期望在今后的工作中借鉴和推广。

During the in-situ leaching periods or uranium preliminary exploration,detail prospecting,it is needed to know the Ra-Rn balance coefficient that is important to correct of the γ logging interpretation results,estimate of the uranium reserves. The geophysical parameters borehole is a very important way to know the balance coefficient,whose building quality is crucial to the parameter＇s accuracy. The thesis has given an elaboration to the borehole＇s building technology and procedure,and a suggestion to the existed problems,such as borehole＇s reaming,stemming method of the case bottom,later γstatus observing times and logging speed. And all of measures mentioned above can prevent damage to the reducer water stops amid borehole＇s building and avoid repeating stemming or poor stemming effect,which not only improve the quality of the borehole＇s building but also shorten the borehole＇s building and observing time,whose aim is to improve the technology,save energy and increase efficiency. Finally,the thesis argues its feasibility of the technical innovation in examples and considers it can be referred and popularized.