长庆油田水平井二流量试井数据去噪方法-《油气井测试》

文章信息/Info

Title:: Denoising method for twoflow well testing data of horizontal wells in Changqing Oilfield

Author(s):: HE Shengping; LIU Liangren; TAN Xiqun; YANG Jun; AN Xiaoping; Exploration and Development Research Institute of Changqing Oilfield Company, PetroChina, Xi′an, Shaanxi 710021, China

Keywords:: Changqing Oilfield; twoflow testing; pressure buildup test; well testing interpretation; least square method; data denoising; smoothness ; ; ; ; ;

摘要:: 长庆油田水平井二流量测试中存在着测试数据质量差、试井解释难度大、解释结果偏差较大等问题。在研究分析104井次测试数据质量的基础上，针对试井分析资料，提出一种基于最小二乘曲线拟合原理的数据去噪处理方法，对曲线形态较好、光滑性较差的数据进行去噪处理。将一口井二流量测试数据去噪前后的解释结果与同一口井的压力恢复测试解释结果进行对比，结果表明，去噪前的解释结果与压力恢复解释结果差异较大，最大相对误差可达95%；而去噪后的解释结果与压力恢复解释结果较为接近，最大相对误差仅为79%，验证了该处理方法的准确性。该方法有效挖掘了质量较差的测试资料中的有用数据，提高了长庆油田水平井二流量测试数据解释结果的可靠性。

Abstract:: There are problems in the twoflow testing of horizontal wells in Changqing Oilfield, such as poor quality of testing data, difficulty in well test interpretation, and serious deviation of interpretation results. After analyzing the data quality of 104 wells test, a data denoising method based on the principle of least squares curve fitting for the well test analysis data was proposed, which can denoise the data with better curve shape and worse smoothness. In practical application, the interpretation results of the twoflow testing data before and after denoising of the same well was compared with the results of its pressure buildup test interpretation. The results show that the interpretation result before denoising was significantly different from the pressure buildup interpretation result, and the maximum relative error can be up to 95%; however, after denoising, the interpretation result was close to the pressure buildup interpretation result, and the maximum relative error was only 79%. This comparison verified the accuracy of the processing method. This method effectively excavated useful data from test data with poor quality and improved the reliability of interpretation results of twoflow testing data of horizontal wells in Changqing Oilfield.