公开(公告)号：US20230400498A1

公开(公告)日：2023-12-14

申请号：US18207516

申请日：2023-06-08

Applicant: China University of Petroleum (East China)

Inventor： Zhihua ZHANG ,  Mingming SUN ,  Yongtao TIAN ,  Hao WANG ,  Kun WANG ,  Chengmin LIU

IPC: G01R31/08

CPC classification number: G01R31/086 ,  G01R31/088

Abstract: The present invention relates to the technical field of fault location of distributed energy resources connected flexible DC distribution network, and disclosed a fault location method, system and application of bipolar short-circuit of two-level VSC-type photovoltaic-connected flexible DC distribution network, wherein, directions of positive currents of DC feeders during fault are used to locate a fault section; a bipolar short-circuit distance measurement model covering interactions and responses of systems is established according to equivalent circuits of transient periods; and fault location is done by obtaining a distance to fault with electric parameters and information of the fault. With the technical solutions offered in the present invention, accurate location of the fault can be done with the electric parameters and information of the fault, a key technology is provided for quick location of bipolar short-circuit of flexible DC distribution network, power supply reliability of the system is further improved, errors due to differentiation of the conventional distance measurement methods are effectively avoided, the location results are more accurate and of high stability, in this way, further development of flexible DC distribution network can be promoted and building of a new power system in the background of energy transition is facilitated.

公开(公告)号：US11820936B2

公开(公告)日：2023-11-21

申请号：US18097190

申请日：2023-01-13

Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) ,  Guizhou Engineering Research Institute of Oil & Gas Exploration and Development

Inventor： Shenglai Guo ,  Yuhuan Bu ,  Chang Lu ,  Lingyun Zhao ,  Yuanlong Wei ,  Qi Zhao ,  Huajie Liu ,  Qiang Wang ,  Xinyang Guo

IPC: C09K8/584 ,  C09K8/487

CPC classification number: C09K8/487 ,  C09K8/584

Abstract: A scour-resistant interface enhancer, a preparation method, and an application thereof are provided. The scour-resistant interface enhancer is a compound solution prepared by using a 0.1% surfactant CAEO-15 and a 0.3% silane coupling agent as solutes and using clear water and absolute ethanol as solvents, where the mass ratio of clear water to absolute ethanol is 9:1. The scour-resistant interface enhancer of the present invention used as pre-flush for well cementing of coalbed methane wells has good wettability modification effect, shows scour-resistant effect against cement slurry, exhibits good compatibility with cement slurry system, and can significantly improve the cementing strength and air tightness of two interfaces of coal bed and effectively enhance the cementing quality of coalbed methane wells.

公开(公告)号：US11807802B2

公开(公告)日：2023-11-07

申请号：US17653030

申请日：2022-03-01

Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)

Inventor： Xianbin Huang ,  Jinsheng Sun ,  He Li ,  Kaihe Lv ,  Jingping Liu ,  Jiafeng Jin ,  Jintang Wang ,  Yingrui Bai

IPC: C09K8/22

CPC classification number: C09K8/22 ,  C09K2208/10 ,  C09K2208/12 ,  C09K2208/22

Abstract: A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor is obtained by performing hydrophobic modification for nano-particles through long-chain organosilicon together with a surface-active agent. A preparation method of the said hydrophobic shale surface hydration inhibitor comprises steps as follows: nano-particles are added to the solvent under stirring conditions, and then an ultrasonic dispersion is performed; upon the end of the ultrasonic dispersion, the reaction system is adjusted to a pH of 9-11 to obtain mixed solution A; a long-chain organosilicon solution is then dropwise added to the mixed solution A for reaction under stirring conditions to obtain mixed solution B; a surface-active agent is added to the mixed solution B for reaction under stirring conditions; upon the reaction is finished, part of the solvent is removed to obtain the inhibitor.

公开(公告)号：US20230349864A1

公开(公告)日：2023-11-02

申请号：US18114289

申请日：2023-02-27

Applicant: China University of Petroleum (East China)

Inventor： Guanghui YUAN ,  Yingchang CAO ,  Zihao JIN ,  Keyu LIU

IPC: G01N30/06 ,  G01N30/72 ,  G01N24/08 ,  G01N33/24

CPC classification number: G01N30/06 ,  G01N30/7206 ,  G01N24/088 ,  G01N33/24 ,  G01N2030/025

Abstract: A thermal simulation experiment method for hydrocarbon-water-rock interactions based on isotope tracing is disclosed. N-eicosane, water and feldspar grains are first heated and reacted in a high temperature high pressure (HTHP) reactor. The reactor is quenched in water to room temperature and samples from the reaction are tested to obtain the composition and content of gas products, the isotopic compositions of gas products, the water solutions and authigenic clays, the nuclear magnetic resonance (NMR) spectra of the liquid hydrocarbons and water solutions, and textures and compositions of minerals. The genetic mechanisms of mass exchange and occurrence of hydrocarbon-water-rock interactions are analyzed. A thermal simulation experiment method using multiple isotope tracing, calibrates the exchange processes and paths for H and O between the hydrocarbons, water and minerals to provide evidence for deciphering the mechanism of the organic-inorganic interactions is disclosed.

公开(公告)号：US20230335015A1

公开(公告)日：2023-10-19

申请号：US18023196

申请日：2022-03-25

Applicant: CHINA UNITED COALABED METHANE ENGINEERING RESEARCH CENTER CO., LTD. ,  CHINA UNIVERSITY OF PETROLEUM ( BEIJING)

Inventor： Junyao Deng ,  Fengyin Xu ,  Jinhui Zhou ,  Lei Zhang ,  Dong Chen ,  Yuan Wang ,  Yuan Ji ,  Xiaoyi Sun ,  Liwei Chi ,  Yi Zhang ,  Siqi Mo ,  Yun Yang

IPC: E21B41/00 ,  G09B25/02

CPC classification number: G09B25/02 ,  E21B41/00

Abstract: An experimental apparatus for simulating substance exchange between a wellbore and a formation. The apparatus includes: a wellbore simulation system, a wellbore liquid injection system, a formation simulation system, a formation fluid injection system, and a data acquisition system; the wellbore simulation system includes a vertically arranged wellbore body for simulating a wellbore; the formation simulation system includes a horizontally arranged sealing body for simulating a formation and a mortar filler filled in the sealing body; the wellbore liquid injection system is connected to the upper end of the wellbore body; the formation fluid injection system is connected to one end of the sealing body so as to inject a formation fluid into the sealing body; the other end of the sealing body is communicated with the bottom of the wellbore body; and the data acquisition system is electrically connected to the wellbore simulation system and the formation simulation system.

公开(公告)号：US20230323769A1

公开(公告)日：2023-10-12

申请号：US18334293

申请日：2023-06-13

Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)

Inventor： Hualin LIAO ,  Ming LU ,  Jiansheng LIU ,  Wenlong NIU ,  Yanfeng GENG ,  Jilei NIU ,  Jingkai CHEN ,  Yucai SHI ,  Fengtao QU ,  Tianyu WU

IPC: E21B47/13 ,  E21B47/013 ,  E21B47/24

CPC classification number: E21B47/13 ,  E21B47/013 ,  E21B47/24

Abstract: A near-bit multi-parameter downhole measurement and control system while drilling, including a ground device and a downhole assembly. The downhole assembly includes a drill bit, a multi-parameter acquisition and signal transmission sub, a positive displacement motor or drilling tool, a receiving and transmitting module, a wireless communication sub, and a non-magnetic drill collar which are connected in sequence. The multi-parameter acquisition and signal transmission sub is provided with the near-bit measuring instrument. The receiving and transmitting module is configured to receive signals from the near-bit measuring instrument and transmit the signals to the wireless communication sub. The wireless communication sub is configured to transmit the received signals to the ground device through a mud pulse generator in a form of pulse signal, and the ground device decodes and analyzes downhole data. The system can monitor and adjust the real-time changes of downhole engineering parameters timely.

公开(公告)号：US20230314645A1

公开(公告)日：2023-10-05

申请号：US17726178

申请日：2022-04-21

Applicant: CHINA UNIVERSITY OF PETROLEUM (East China)

Inventor： Liyun FU ,  Zhiwei WANG ,  Wei WEI ,  Qizhen DU ,  Qingqing LI

IPC: G01V1/30

CPC classification number: G01V1/303 ,  G01V2210/74 ,  G01V2210/6222

Abstract: The seismic imaging resolution analysis method comprises: obtaining common-shot gathers and common-detector gathers; in the common-shot gathers, conducting detector focusing analysis on a focus point at (xj, zn) in each source point gather to obtain a source point focal-beam gather; looping all the focus points at a depth zn, and conducting computation on a weighted source-focusing operator Pik† (zn, zn); in the common-detector gathers, conducting source point focusing analysis on an focus point at (xj, zn) in each source point gather to obtain a detector focal-beam gather; Loop all the focus points at a depth zn, and conducting computation on a weighted detector-focusing operator Pik (zn, zn); and conducting computation on a normalized resolution function of a single focus point so as to obtain a horizontal resolution and a definition.

公开(公告)号：US11747306B2

公开(公告)日：2023-09-05

申请号：US17690475

申请日：2022-03-09

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： Hong Zhang ,  Xiaoben Liu ,  Tong Shi ,  Honglin Zhao ,  Chengqi Liu ,  Jie Liu

IPC: G01N29/04 ,  F16L55/40 ,  G01N29/12 ,  F16L101/30

CPC classification number: G01N29/043 ,  F16L55/40 ,  G01N29/048 ,  G01N29/12 ,  F16L2101/30

Abstract: The present application provides a pipeline structural fault diagnosis apparatus and a diagnosis method. The pipeline structural fault diagnosis apparatus includes a signal generating apparatus configured to generate an acoustic wave signal by knocking a pipeline; a signal collecting apparatus configured to collect the acoustic wave signal; a signal storage apparatus configured to store the acoustic wave signal for a signal processing and analyzing apparatus to analyze and determine a fault type, a fault degree, and a fault position. The acoustic wave signal after being generated by the signal generating apparatus is collected by the signal collecting apparatus and stored in the signal storage apparatus. The signal processing and analyzing apparatus extracts the acoustic wave signal in the signal storage apparatus, and performs processing and analysis to determine the fault type, the fault degree, and the fault position of the pipeline structure.

公开(公告)号：US11719658B2

公开(公告)日：2023-08-08

申请号：US17994420

申请日：2022-11-28

Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)

Inventor： Yuhuan Bu ,  Shengda Shen ,  Chang Lu ,  Huajie Liu ,  Shenglai Guo ,  Xun Shan ,  Rui Ma

IPC: E21B33/14 ,  G01N25/18 ,  E21B49/02 ,  G01N33/38

CPC classification number: G01N25/18 ,  E21B33/14 ,  E21B49/02 ,  G01N33/383

Abstract: A performance evaluation device and a design method of a cement for well cementing in a penetrated hydrate layer are provided. The performance evaluation device includes an equivalent wellbore, an inner circulation system, an outer circulation system, a thermal insulation cover, a bracket, a temperature sensing system, and a cement mold. The device can simulate a true downhole situation, conduct an evaluation experiment on the heat insulation performance of a cementing cement, and conduct experiments at different temperatures with automatic temperature control. The design method is to use a low-hydration, early-strength, and heat-insulating cement slurry system during the well cementing in a penetrated hydrate layer, where the low-hydration and early-strength characteristics ensure the effective sealing of a hydrate layer during a cementing process, and the heat insulation characteristic results in low heat conductivity and thus can ensure the stability of a hydrate layer during a production operation.

公开(公告)号：US11719081B2

公开(公告)日：2023-08-08

申请号：US17596156

申请日：2020-04-30

Applicant: CHINA UNIVERSITY OF PETROLEUM

Inventor： Teng Lu ,  Zhaomin Li ,  Binfei Li ,  Songyan Li

IPC: E21B43/24 ,  E21B43/16

CPC classification number: E21B43/24 ,  E21B43/166

Abstract: Disclosed is a method for performing integral plugging control on water invasion and steam channeling of an edge-bottom water heavy oil reservoir. The method for performing integral plugging control on water invasion and steam channeling of an edge-bottom water heavy oil reservoir comprises the following steps: (1) selecting an oil reservoir; (2) arranging a huff-puff well; (3) performing steam huff-puff development; and (4) performing integral plugging control. An integral plugging control technology is used for the method, a high-strength nitrogen foam system is injected by means of well rows at different positions in the oil reservoir, and effective plugging walls are formed at different positions from the edge-bottom water to reduce water invasion and steam channeling.