Laboratory Evaluation of Weighting Materials for Ultra-High Density Oil-Based Drilling Fluids in Ultra-HPHT Wellbore Applications
- Qinghui Li (Qianhai Harbour Energy Technology Development Shenzhen Co., LTD) | Jinzhi Zhu (Petrochina Tarim Oilfield Company) | Shaoxuan Li (Xidian University) | Shaojun Zhang (Petrochina Tarim Oilfield Company) | Nasr-El-Din Hisham (Texas A&M University) | Lingling Ren (Petrochina Tarim Oilfield Company) | Jiaxue Li (Petrochina Tarim Oilfield Company) | Manayer Al-Mujalhem (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 18-21 March, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 2.2 Installation and Completion Operations, 1.11 Drilling Fluids and Materials, 4.1.2 Separation and Treating, 2.2 Installation and Completion Operations, 7.4 Energy Economics, 4.1 Processing Systems and Design, 7.4.3 Market analysis /supply and demand forecasting/pricing, 7 Management and Information, 4 Facilities Design, Construction and Operation, 1.6.9 Coring, Fishing
- Ultra-high Density, Laboratory Tests, Ultra HPHT Wellbore, Weighting Material, Oil-based Drilling Fluid
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- 110 since 2007
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Global energy demand has driven the petroleum industry to develop hydrocarbon resources from extremely harsh formations which contain ultra-high pressure and temperature (HPHT) reservoirs. Ultra-high density drilling fluids are critical to successful drilling and completion practices in all of these wells. In this paper, potential weighting materials were systematically evaluated and screened to accomplish an ultra-high density oil-based drilling fluid system (19.62 to 22.12lb/gal) aimed to utilize in ultra HPHT conditions (>30000psi and >410°F).
Several potential high-density weighting materials were evaluated in the laboratory conditions. Basic properties (pure density, particle size/distribution, surface area etc.) were evaluated and compared. Special treatments were conducted to optimize the properties of weighting materials. HPHT filtration tests under static and dynamic conditions were conducted at higher than 410°F and 300 psi. Real cores with an average porosity of 19% and an average permeability of 50 mD were used in the filtration tests. Rheological properties, sag tendency, the volume of filtrate, and the filtrate cake characterization of oil-based drilling fluids were measured before and after heating at 410°F for 16 hours.
Results revealed that ultra-micro manganese and ilmenite complex after suitable surface treatment could act as an ideal weighting material than ultra-pure barite or other materials, which could fail in rheology and sag controlling measurement with such high temperature and density. The viscosity and filtration analysis confirmed the stability and reliability of this novel ultra-high density oil-based drilling fluid.
This study developed a challenged drilling fluid system under critical testing states, as well as established a systematical laboratory evaluation and screening procedure of weighting materials for ultra-deep wells and contributed recommendations on how to utilize it in the fields.
|File Size||1 MB||Number of Pages||10|