公开(公告)号：US20210324716A1

公开(公告)日：2021-10-21

申请号：US16331929

申请日：2018-08-03

Applicant: CHINA UNIVERSITY OF PETROLEUM

Inventor： Chao ZHANG ,  Zhaomin LI ,  Jianlin LIU ,  Dongya ZHAO ,  Teng LU ,  Shouya WU ,  Longjiang GUO

IPC: E21B43/16 ,  E21B43/40

Abstract: A CCUS system for exploiting a thickened oil reservoir based on an optimal flue gas CO2 enrichment ratio. The CCUS system comprises a flue gas CO2 enrichment unit, a flue gas injection unit, a thickened oil thermal production well group unit and a produced gas recovery unit; the fuel gas CO2 enrichment unit comprises an air separating enrichment unit and a boiler injection gas premixed tank; the air separating enrichment unit comprises an air separating primary device used for separating air into oxygen and nitrogen preliminarily, and an air separating secondary device used for further enriching a part of the oxygen which is subjected to the preliminary separation; and the boiler injection gas premixed tank is used for mixing the preliminarily separated nitrogen, the preliminarily separated part of the oxygen and/or the further enriched oxygen.

公开(公告)号：US11136488B1

公开(公告)日：2021-10-05

申请号：US17228424

申请日：2021-04-12

Applicant: China University of Petroleum (Beijing)

Inventor： Guancheng Jiang ,  He Shi ,  Kaixiao Cui ,  Yinbo He ,  Lili Yang ,  Tengfei Dong ,  Chunyao Peng ,  Xuwu Luo ,  Bin Tan ,  Jun Cai ,  Xing Liang ,  Zhiliang You ,  Yong Wang

IPC: C09K8/36 ,  C08G63/685 ,  C08G63/78

Abstract: The present invention relates to the technical field of oil and gas drilling, and discloses a biodiesel-based constant rheological property drilling fluid containing intelligent temperature responsive polymer, which contains two or more of the following components which are stored in admixture or separately: base oil biodiesel, aqueous phase, emulsifier, organic soil, constant rheological property flow pattern modifier, hydrolysis inhibitor, filtrate reducer and weighting material; the constant rheological property flow pattern modifier is an intelligent temperature responsive polymer, and the polymer contains structural units provided by bis-hydroxyethyl bis-hydroxypropyl stearyl ammonium chloride, ethylene bis-stearamide and dimerized fatty acid. The drilling fluid provided by the present invention has excellent environmental protection property and degradability, and has conventional rheological property, weak gel structure and fluid loss property which are equivalent to those of the conventional oil-based drilling fluid, and also has excellent temperature resistance, CaO compatibility and constant rheological property.

公开(公告)号：US20210246729A1

公开(公告)日：2021-08-12

申请号：US17056751

申请日：2019-12-16

Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)

Inventor： Yongwang LIU ,  Zhichuan GUAN

IPC: E21B7/18 ,  E21B10/43 ,  E21B10/60

Abstract: A drill bit performs pilot rock-breaking using an outer annular drill bit and breaks a central rock pillar using a central drill bit mounted in the middle of the annular drill bit and located inside a drill bit body to induce unloading of a bottom hole stress. A method mixes rock debris produced by rock breaking of the central drill bit as abrasive with the drilling fluid flowing into the entire drill bit as abrasive jet liquid phase to form an abrasive jet. The method includes obtaining an annular borehole by braking, and breaking the rock pillar at the inner side of the annular borehole to induce unloading of the bottom hole stress, mixing the rock debris produced by breaking the rock pillar at the inner side of the annular borehole as abrasive with the drilling fluid entering the drill bit to form an abrasive jet.

公开(公告)号：US20210220784A1

公开(公告)日：2021-07-22

申请号：US17264539

申请日：2020-04-17

Applicant: China University of Petroleum (East China)

Inventor： Chao ZHANG ,  Zhaomin LI ,  Songyan LI ,  Yong WANG ,  Guangzhong LV ,  Shouya WU ,  Linghui XI ,  Meijia WANG

IPC: B01F13/06 ,  B01F11/02 ,  B01F13/10 ,  B01F15/02 ,  B01F3/08

Abstract: Provided is a carbon dioxide fluidity control device comprising, a sample preparation tank, a high-pressure stirring unit, a reciprocating plunger pump and a booster pump, wherein the stirring unit comprises one or more high-pressure stirring tanks, each provided with an atomizing spray probe and a piston, wherein a discharge port of the sample preparation tank is connected to the atomizing spray probe via a plunger pump, which is connected to the piston to push the piston to reciprocate; the booster pump is connected to the high-pressure stirring tanks to provide supercritical carbon dioxide to the high-pressure stirring tank; and a discharge port of the high-pressure stirring tanks is connected to an oilfield well group. Provided is a carbon dioxide fluidity control method using the device, comprising mixing surfactants and nanoparticles with heated carbon dioxide, and injecting a microemulsion of supercritical carbon dioxide and nano-silicon dioxide into an oilfield well group.

公开(公告)号：US20210139764A1

公开(公告)日：2021-05-13

申请号：US17151386

申请日：2021-01-18

Applicant: CHINA UNIVERSITY OF PETROLEUM

Inventor： YINGRUI BAI ,  JINSHENG SUN ,  KAIHE LV ,  XIANBIN HUANG ,  XIAOSEN SHANG ,  JIAFENG JIN ,  JINGPING LIU ,  JINTANG WANG

IPC: C09K8/508 ,  C09K8/502

Abstract: The invention presents a high temperature-resistant and high oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and its preparation method, wherein the plugging agent is prepared from raw materials in parts by mass as follows: 15-30 parts of reaction monomers, 5-12 parts of linear high polymers, 0.1-1.5 parts of cross-linking agents, 0.1-0.5 parts of initiators, 1-3 parts of modified starches, 1-5 parts of filler particles and 1-5 parts of dispersing agents. The resin particle plugging agent presented in the invention not only has high oil absorption capacity under a high-temperature condition, but also has high toughness after oil-absorbing expansion. It is not easy to break by extrusion and stretching and can effectively plug a high-temperature leakage passage. Also, the resin plugging particles in it will not be affected by crack factors.

公开(公告)号：US20210132246A1

公开(公告)日：2021-05-06

申请号：US17022802

申请日：2020-09-16

Applicant: China University of Petroleum (East China)

Inventor： Jingshou LIU ,  Kongyou WU ,  Caiwei FAN ,  Guanjie ZHANG ,  Lijie CUI ,  Shouzheng SHENG

IPC: G01V1/28

Abstract: A method for determining grid cell size in geomechanical modeling of fractured reservoirs including a variation range of mechanical parameters of the reservoir is determined. A three-dimensional fracture discrete network model is established. Mechanical parameters of fracture surface are determined on the basis of fracture surface mechanical test. Equivalent mechanical parameters of models with different sizes are researched by three-cycle method, and size effect and the anisotropy of the mechanical parameters of the fractured reservoir are calculated respectively, and an optimal grid cell size in geomechanical modeling is determined.

公开(公告)号：US10969321B2

公开(公告)日：2021-04-06

申请号：US16390131

申请日：2019-04-22

Applicant: China University of Petroleum (East China)

Inventor： Yongfei Yang ,  Jun Yao ,  Yingwen Li ,  Wenjie Zhang ,  Zhihui Liu ,  Haiyuan Yang ,  Qianfei Lv ,  Xin Wang ,  Ning Wu ,  Ke Wang ,  Jie Liu ,  Liu Tao ,  Xinze Li ,  Pengfei Liu

IPC: G01N13/02 ,  E21B49/02

Abstract: A method and system for determining contact angles of porous media, including: in a displacement simulation experiment, injecting a displacement fluid into a actual core sample, and performing computed tomography scanning on the core to determine three-dimensional images at different oil displacing time points; segmenting different phases of the three-dimensional images to obtain segmented three-dimensional images; marking a contact line between different phases according to the segmented three-dimensional images, where the phases are underground fluids or displacement fluids and a rock matrix in the displacement simulation experiment; and determining a contact angle of the porous media at different 3D positions at different time points according to the contact line. The method and system provided can obtain the dynamic changing process of the contact angle at different 3D positions in the core at different displacement time points, reflect the wettability of the real reservoir environment more accurately.

公开(公告)号：US20210087475A1

公开(公告)日：2021-03-25

申请号：US17028994

申请日：2020-09-22

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： XINGYING LAN ,  YUMING ZHANG ,  JINSEN GAO ,  XIAOGANG SHI ,  CHENGXIU WANG

IPC: C10G9/36 ,  C10G31/08 ,  C10G57/00

Abstract: A coupling reaction apparatus for heavy oil cracking-gasification, including a cracking section and a gasification section communicated with each other, and the cracking section is located above the gasification section; the cracking section is provided with a heavy oil raw material inlet and a fluidizing gas inlet, and an upper part of the cracking section is provided with an oil-gas outlet; and the gasification section is provided with a gasification agent inlet.

公开(公告)号：US10947830B2

公开(公告)日：2021-03-16

申请号：US16257254

申请日：2019-01-25

Applicant: China University of Petroleum—Beijing

Inventor： Guangqing Zhang ,  Yuanxun Nie ,  Cankun Lin

IPC: E21B43/26 ,  E21B43/20 ,  E21B47/18

Abstract: A fracturing method for creating a complex crack network by intermittent fracturing on site, which relates to oil and gas field development, and comprises the following steps: pumping a fracturing fluid into an oil well to enter the reservoir, continuing pumping the fracturing fluid into fractured cracks after a pumping pressure has reached a preset pressure, and stopping pumping the fracturing fluid after a preset condition has been reached; performing under-pressure shut-in for the oil well; stopping the shut-in operation when a signal detecting vehicle cannot receive an obvious microseismic signal in the under-pressure shut-in process; repeating the above three steps multiple times; pumping the fracturing fluid into the oil well to enter the reservoir by the fracturing truck until an amount of the pumped in fracturing fluid reaches a design pump-in liquid amount; pumping a sand-carrying fluid into the oil well to enter the reservoir by means of a sand blending truck and the fracturing truck after the amount of the pumped in fracturing fluid has reached the design pump-in liquid amount, and stopping pumping the sand-carrying fluid after the pumped in sand-carrying fluid has reached a preset sand adding amount.

公开(公告)号：US10937210B2

公开(公告)日：2021-03-02

申请号：US16395060

申请日：2019-04-25

Applicant: China University of Petroleum (East China)

Inventor： Mingming Tang ,  Shuangfang Lu ,  Yang Gao ,  Shunwei Wu ,  Jing Zhang ,  Haisheng Hu ,  Wenbiao Huang ,  Huifang Ma ,  Jiafan Tang ,  Hongkun Tan ,  Changhong Chu

IPC: G06T11/00 ,  G06T7/49 ,  G06T7/11 ,  G01N1/28 ,  G06T7/136 ,  G01N15/08

Abstract: A reconstruction method for a pore structure of a core with micro-CT (Computed Tomography) is provided. With utilizing a FIB-SEM (Focused Ion Beam-Scanning Electron Microscope) experiment, an actual porosity corresponding to a grey level in micro-CT results is obtained, so as to establish a relationship between the grey level of a micro-CT image and the porosity. Thereafter, according to the above relationship, a certain porosity is assigned to each pixel in the micro-CT image, so as to establish a soft segmentation method of the pore structure. The reconstruction method provided by the present invention discloses a soft segmentation method for digital reconstruction of the pore structure of the core combined with FIB-SEM data and micro-CT data, and establishes a fractional digital pore structure model of the core, which further improves a matching degree between the digital pore structure model of the core and an actual core.