Gel-breaking free drill-in fluid technology for deepwater high-porosity and high-permeability reservoirs

被引：0
|
作者：
Zhao X. [1 ,2 ]
Geng Q. [1 ,2 ]
Qiu Z. [1 ,2 ]
Geng T. [3 ]
Zhou G. [1 ]
Xing X. [4 ]
机构：
[1] Shandong Key Laboratory of Oilfield Chemistry, China University of Petroleum - East China, Qingdao, 266580, Shandong
[2] School of Petroleum Engineering, China University of Petroleum - East China, Qingdao, 266580, Shandong
[3] China Oilfield Services Limited, Sanhe, 065200, Hebei
[4] CNOOC Research Institute Co., Ltd., Beijing
来源：
Natural Gas Industry | 2021年 / 41卷 / 04期
关键词：
Deepwater gas field; Drill-in fluid; Formation damage mechanism; Gel-breaking free; High-porosity and high-permeability; Plugging removal by flowback; Reservoir formation protection; South China Sea;
D O I：
10.3787/j.issn.1000-0976.2021.04.012
中图分类号：
学科分类号：
摘要：
Deepwater drilling and completion engineering has high cost and great risk, and severe reservoir damage can cause substantial losses. In this paper, the reservoir damage mechanisms in the deepwater gas fields of the South China Sea were analyzed by means of X-ray diffraction, mercury intrusion, scanning electron microscope, hydration swelling and dispersion experiment, and reservoir sensitivity flow experiment. Then, technical countermeasures for reservoir protection were proposed and the drill-in fluid with the ability of reservoir protection was optimized. And the following research results were obtained. First, this reservoir is a sandstone reservoir of high porosity and high permeability and its average clay content is 12.38%. It has a strong velocity sensitivity and moderate water sensitivity. Second, the reservoir damage mechanisms mainly include the solid invasion of drilling and completion working fluid and the incompatibility between working fluid and reservoir rock. Third, the effective temporary plugging of the large-sized pore throats using the ideal packing bridging method is the key technical measure to protect reservoirs. Fourth, the optimized water based drill-in fluid has stable rheological properties under 2-75℃, the temperature of deepwater wellbore. The recovery ratio of core permeability is in the range of 74.5-92.24% after direct plugging removal by flowback. In addition, the recovery ratio of core permeability is higher than 86% after the core is successively contaminated by the drill-in fluid and chelating acid completion fluid. The field applications in four deepwater wells show that no downhole troubles happen, and plugging removal by flowback is carried out directly after the operation, so the completion operation time is saved. In conclusion, the optimized drill-in fluid can meet the drilling technical requirements of deepwater high-porosity and high-permeability reservoirs. What's more, it is gel-breaking free and its reservoir protection effect is good. © 2021, Natural Gas Industry Journal Agency. All right reserved.
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页码：107 / 114
页数：7
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