海上钻井中运用泥浆温度测算地温梯度方法研究

Estimation of True Formation Temperature Based on Mud Temperature Data in Offshore Drilling

摘要: 南海东部海域白云凹陷钻遇极高温井，预测甜点段地层温度区间为200℃~250℃，已达到甚至超过大多数测井测试工具的耐温极限，给勘探作业施工带来了巨大的挑战。在工具耐温性能短期内无法提升的情况下，准确的地层温度测算是高温井作业方案设计和作业跟踪决策的基础。传统的测算方法引入参数较多且部分参数较难获取，对于新目标、测试温度数据缺乏的区块适用性差，无法快速解决作业问题。本文通过简化模型和多井数据规律总结，提出2种利用泥浆温度测算地层温度的新方法，方法具有计算参数精炼、适用性强的特点。在BY2-F井中运用新方法进行测算，取得了良好的应用效果。

Abstract: Ultra-high temperature well appears in Baiyun sag. It is predicted that the temperature range of the formation in the sweet spot section is 200˚C~250˚C, which has reached or even exceeded the temperature tolerance limit of most logging tools, bringing great challenges to the exploration operation. Under the condition that the tool temperature resistance cannot be improved in a short period of time, accurate formation temperature measurement is the basis of high-temperature well operation scheme design and operation tracking decision-making. The traditional calculation method introduces many parameters and some parameters are difficult to obtain. It has poor ap-plicability for the new target and the block with a lack of test temperature data, so it cannot solve the operation problem quickly. In this paper, two new methods of using mud temperature to cal-culate formation temperature are put forward by simplifying the model and summarizing the law of multi-well data. The method has the characteristics of refining calculation parameters and strong applicability. The new method has been used in BY2-F well and good results have been obtained.