Identification of Interwell Interference Based on Hydrogeochemical Characteristics of Produced Water from Coalbed Methane Wells: A Case Study in the Southern Qinshui Basin, China

IF 3.2 3区工程技术 Q1 ENGINEERING, PETROLEUM

SPE Journal Pub Date : 2024-04-01 DOI:10.2118/219759-pa

Mingkai Tu, Xiaoming Wang, Shihui Hou, Wenwen Chen, Zheng-Jie Dang

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Abstract

Interwell interference is the superposition effect of coalbed methane (CBM) reservoir pressure. This study aims to provide a new direction for the quantitative analysis of interwell interference from the hydrogeochemical characteristics of produced water from CBM wells. A total of 24 produced water samples collected from the Panhe (PH) group, Shizhuangnan (SZN)-1 group, and SZN-2 group in Qinshui Basin were selected for the comparative analysis. The water type of all water samples is characterized by Na-HCO3, with Na+ being the main total dissolved solids (TDS) provider. The self-similar major ionic characteristics of the PH and SZN-2 groups are prone to the occurrence of interwell interference. The δD and δ18O show that the main source of produced water is atmospheric circulating water. The similar isotope characteristics of produced water in the PH and SZN-2 groups represent that there is remarkable interwell interference. Sr, As, Cu, Ga, Li, Rb, Sn, Mo, and V are selected as indicator elements. In the cluster analysis, all CBM wells form a single cluster in the PH and SZN-2 groups in the first three iterations, indicating interwell interference. According to the established fuzzy discriminative model, interwell interference is divided into two types—strong interwell interference and weak interwell interference. Most CBM wells in the PH and SZN-2 groups show strong interwell interference. This study can provide theoretical foundations for the dynamic pressure regulation and well pattern infilling of CBM wells.

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基于煤层气井产水水文地质化学特征的井间干扰识别：中国沁水盆地南部案例研究

井间干扰是煤层气储层压力的叠加效应。本研究旨在从煤层气井产水的水文地质化学特征出发，为井间干扰的定量分析提供一个新的方向。本研究选取了沁水盆地泮河（PH）组、石庄南（SZN）-1 组和 SZN-2 组共 24 口井的采出水样品进行对比分析。所有水样的水型特征均为 Na-HCO3，其中 Na+ 是主要的溶解性总固体（TDS）提供者。PH 组和 SZN-2 组的主要离子特性自相似，容易发生井间干扰。δD和δ18O表明，采出水的主要来源是大气循环水。PH 组和 SZN-2 组采出水的同位素特征相似，表明存在明显的井间干扰。选取 Sr、As、Cu、Ga、Li、Rb、Sn、Mo 和 V 作为指示元素。在聚类分析中，在前三次迭代中，所有煤层气井在 PH 组和 SZN-2 组中形成一个聚类，表明井间干扰。根据建立的模糊判别模型，井间干扰分为两种类型--强井间干扰和弱井间干扰。PH组和SZN-2组的大多数煤层气井表现为强井间干扰。该研究可为煤层气井的动态压力调节和井型充填提供理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

SPE Journal 工程技术-工程：石油

CiteScore

7.20

自引率

11.10%

发文量

229

审稿时长

4.5 months

期刊介绍： Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.