Chinese Academy of Sciences

Northeast Petroleum University

Naigui Liu

Jianzhao Yan

Likuan Zhang

Ming Cheng

Yuhong Lei

Xiaorong Luo

Fei Tian

Wang Zhang

Changchun Yang

Xu Xue

Hansheng Ji

Zhijun Jin

The present invention provides a device and a method for measuring fluid saturation in nuclear magnetic resonance (NMR) on-line displacement, the method comprising: measuring a nuclear magnetic resonance (NMR) T2 spectrum under the dead volume filling of the on-line displacement system as displacing phase fluid and the core to be measured as saturated nuclear magnetic detection phase fluid to generate a calibrated T2 spectrum; measuring a nuclear magnetic resonance (NMR) T2 spectrum of a process in which the core to be measured is converted from a saturated displaced phase fluid into a displacing phase fluid to generate a displacement process T2 spectrum; generating the fluid saturation of the on-line displacement system in real time according to the generated calibrated T2 spectrum and the displacement process T2 spectrum. The present invention achieves the purpose of improving measurement precision of fluid saturation in the on-line displacement process.

Device and method for measuring fluid saturation in nuclear magnetic resonance on-line displacement

A method for determining rock wettability based on contact angle measurement and correction of multiple oil globules includes: saturating a rock sample with oil, placing a shooting angle calibration circle on a measurement surface of the rock sample, and placing the rock sample saturated with oil in water for water imbibition and oil displacement to form a rock sample with multiple oil globules; acquiring an image of a measurement surface of the rock sample with multiple oil globules at a shooting angle &#x3b1; and a deformation degree of the calibration circle in a shooting field of view, and calculating the shooting angle &#x3b1;; correcting, based on the shooting angle &#x3b1;, a contact angle measurement value &#x3b3; through a contact angle correction model to acquire a contact angle correction value &#x3b8;; and determining, based on the contact angle correction value &#x3b8;, wettability of the rock sample.

System and method for determining rock wettability based on contact angle measurement and correction of multiple oil globules

The invention relates to a high-temperature and high-pressure nuclear magnetic resonance core holder. An inner cylinder body of the core holder is provided in an outer cylinder body, a nuclear magnetic resonance probe coil is provided between the outer cylinder body and the inner cylinder body, two plugging sleeves are respectively provided between both ends of the inner cylinder body and between both ends of the outer cylinder body, a sealing groove is provided at the inner side of each plugging sleeve, a sealing joint component is provided in each sealing groove of each plugging sleeve, and two ends of the nuclear magnetic resonance probe coil are respectively connected with the sealing joint component, so that the nuclear magnetic resonance probe coil can be led out. The holder disclosed by the invention is compatible with nuclear magnetic resonance, integrates injection displacement experiments and nuclear magnetic resonance measurement, and adopts a sealing solution to ensure the sealing performance of the joint of the outer cylinder body and the inner cylinder body, so as to adapt to nuclear magnetic resonance on-line measurement and analysis experiments under the condition of simulative deep basin high-temperature and high-pressure.

High-temperature and high-pressure nuclear magnetic resonance core holder

The invention relates to the technical field of oilfield exploration and development, and particularly relates to a method for characterizing the rock physical characteristics of deeply buried carbonate rocks, comprising the following steps: determining a rock type of a rock thin section by identifying the surface structure characteristics of the rock thin section corresponding to a core plunger sample; performing a normal pressure nuclear magnetic resonance test and rock physical characteristic tests on the core plunger sample; establishing an identification plate, a first relation, a second relation and a third relation; characterizing the rock physical characteristics of a target rock sample under normal pressure and its buried depth according to the normal pressure nuclear magnetic resonance test result and the overburden pressure nuclear magnetic resonance test result of the target rock sample respectively.

Method for characterizing rock physical characteristics of deeply buried carbonate rocks

Growing community of inventors

Beijing, China

Naigui Liu