基于低场核磁共振录井钻井液的油气识别技术

Hydrocarbon Identification Technique Based on Low Field NMR Well Logging of Drilling Fluids

摘要: 随着钻井工艺的不断进步以及勘探开发对象趋于复杂化，荧光录井和气测录井已经不能完全满足现场油气识别与评价的需求。当钻遇油气层及水层等不同流体时，其钻井液在核磁弛豫谱上响应位置是不同的。根据该特性可以计算钻井液的含油率和含水率，进而直观地判断油层、干层和水层，再综合利用录井气测和荧光参数建立不同地区，不同油品，不同储层的油、水层解释初步标准，为完井及试油层位决策提供全面、准确的依据。与常规录井测试相比，该次研究采用高分辨率低场核磁共振技术对水基钻井液的弛豫特性进行研究，建立了水基钻井液含油性及含油率的精细评价方法，并对东北某油田砂岩储层水基泥浆进行了大量的实验和验证，建立了水基钻井液含油性及含油率的精细评价方法，提高了录井技术对流体性质识别的准确性。由此可见，利用核磁共振技术测试钻井液含油率对录井行业具有重要而深远的意义。

Abstract: With the progress of drilling technology and the complication of exploration and development, Fluorescent logging and gas logging could not meet the demands of field oil and gas identification and evaluation. When different fluids in oil and gas layer and water layer are drilled, the response location of drilling fluid is different in nuclear magnetic relaxation spectra. According to the characteristics of drilling fluid, the ratio of oil and water content could be calculated to judge fluid types in reservoir, and a preliminary standard method was built for different areas and different oil reservoirs to solve the comprehensive utilization in combination with well-logging interpretation and fluorescence parameters, this study provided a comprehensive and accurate basis for decision making for well completion and oil testing horizon. Compared with the conventional mud logging methods, low field nuclear magnetic resonance technology is used to study the water based drilling fluid based on their NMR relaxation. A number of experiments and applications in northeast oilfield are established in order to improve the accuracy of evaluation technology to identify the fluid types. The nuclear magnetic resonance technology used for testing drilling fluid has important and far reaching significance for the mud-logging industry.