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The effects of temperature and acid number of crude oil on the wettability of acid volcanic reservoir rock from the Hailar Oilfi eld

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Petroleum Science 2010年第1期7卷 93-99页

作者： Xie Quan He Shunli Pu Wanfeng Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Siehuan 610500 China

Wettability of acid volcanic reservoir rock from the Hailar Oilfield, China, was studied with crude oils of different acid numbers generated from an original crude oil with an acid number of 3.05 mg KOH/g. The modifed oils and their resultant acid numbers were： A （2.09 mg KOH/g）, B （0.75 mg KOH/g）, C （0.47 mg KOH/g）, D （0.30 mg KOH/g）, and E （0.18 mg KOH/g）. Contact angles and improved Amott water indexes were measured to study the effects of temperature and acid number on the wettability of the acid volcanic reservoir rock. Experimental results indicated that the wettability was not sensitive to variation in temperature when using the same oil, but the acid number of the crude oil was a key factor in changing the wettability of the rock. The Amott water index, Iw was an exponential function of the acid number, and the Amott water index increased as the acid number decreased （i.e. Amott water index exponentially decreased with the acid number increase）. The Iw value of the core saturated with oil A, with an acid number of 2.09 mg KOH/g, ranged from 0.06 to 0.11, which indicated low water wetness. If the acid number of the oil decreased to 0.18 mg KOH/g, the Iw value increased to 0.95, which indicated strong water wetness. The contact angle decreased from 80~ to 35~ when the aid number decreased from 0.75 to 0.18 mg KOH/g, indicating a change towards more water wet conditions. The oil recovery by spontaneous imbibition of water also increased as the acid number of the oil decreased. As an example, at 80 ~C, the recovery of Oil A with an acid number of 2.09 mg KOH/g was only 7.6%, while Oil E with an acid number of 0.18 mg KOH/g produced 56.4%, i.e. an increase of 48.8%.

关键词： acid volcanic reservoir rock Amott wettability index wetting angle temperature acid number wettability

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Properties of a High Hydrolysis Stable Nitrogenous Benzo-heterocyclic Borates

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China Petroleum Processing & Petrochemical Technology 2020年第2期22卷 37-45页

作者： Tian Ying Lyu Ya East China University of Science and Technology Shanghai 200237

A benzotriazole-containing derivative was synthesized via the Mannich *** structure was characterized by NMR *** utilizing computational chemistry and molecular simulation,the calculation and mapping of atomic charge and frontier molecular orbitals with complex structure of the borate were carried *** acid number of BTBE(nitrogen-containing heterocyclic borate)was determined by the standard test method for acid number and the open observation *** results showed that BTBE had a low initial acid number,because the acid number was changed only after 72 hours of hydrolysis,and it was negative after the hydrolysis reached 120 *** extreme-pressure friction resistance of BTBE and other four base oils was also *** 5 kinds of base oils,the friction experiment was carried out under a load of 30 kgf,and the BTBE showed a lowest wear scar diameter(0.365 mm)along with a highest maximum non-seizure *** results showed that the EP friction resistance of BTBE was stronger than that of other four base oils under the same test *** results of hydrolysis performance showed that the synthesized nitrogencontaining heterocyclic borate had a high resistance to hydrolysis,while demonstrating broad application prospects.

关键词： borate Mannich reaction acid number hydrolysis EP friction resistance

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Investigation of alkalineecrude oil reaction

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Petroleum 2015年第1期1卷 31-39页

作者： James J.Sheng Texas Tech University Petroleum EngineeringP.O.Box 43111LubbockTX 79409USA

One of the mechanisms of alkaline flooding relies on alkaline reaction with organic acids(saponifiable components)in the crude oil to produce an in situ surfactant called soap that lowers interfacial ***,this mechanism is not quantified in the *** example,what is the fraction of acid components which react with alkaline solution to generate soap?How much soap can be generated?In this paper,this mechanism and related issues are discussed,analyzed or *** particular,the numerical simulation approach is *** results show that only a fraction of acid components can be converted into soap;the amount of generated soap could be low.A minimum pH(e.g.9)is needed for the acids to be converted to *** literature information on the effect of amount of acid components(total acid number)on oil recovery is also discussed.

关键词： Alkali Alkaline flooding Crude oil acid number Soap Surfactant

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