公开(公告)号：US20240159644A1

公开(公告)日：2024-05-16

申请号：US18476338

申请日：2023-09-28

Applicant: Southwest Petroleum University

Inventor： Yu Xiong ,  LingHong Wang ,  MeiHua Chen ,  TingTing Lei ,  MeiJuan Guo ,  HaiTao Hong ,  XiuQing Li ,  Rui Zhang

IPC: G01N15/08 ,  G01N1/44 ,  G01N24/08 ,  G01N33/24

CPC classification number: G01N15/0886 ,  G01N1/44 ,  G01N24/081 ,  G01N33/24

Abstract: A method for determining lower radius limit of movable throat of shale is provided, and it includes: performing a low-temperature nitrogen adsorption test on a target shale to obtain first pore radii; performing a high-pressure mercury injection test on the target shale to obtain second pore radii; performing a nuclear magnetic resonance test on the target shale to obtain third pore radii; obtaining a relationship diagram of distribution frequencies and pore radii according to three pore radii; distinguishing, according to the pore radii, relationship diagram data, and performing normalization processing to determining a relationship curve of normalized frequency data and the pore radii; and determining a lower radius limit of movable throat of shale according to relationship curve. A problem of describing characteristics of shale occurrence space with complex pore structures and strong heterogeneity is solved, the method is suitable for determining lower radius limit of movable throat of shale.

公开(公告)号：US11979506B2

公开(公告)日：2024-05-07

申请号：US17431133

申请日：2020-07-14

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Xiaojun Zhang ,  Chao Huang ,  Jingwei Zhang ,  Jie Gong ,  Ziyu Zhou ,  Shuang Zheng ,  Jie Zhao

IPC: H04L9/32 ,  H04L9/00 ,  H04L9/06 ,  H04L9/14 ,  H04L9/30

CPC classification number: H04L9/3247 ,  H04L9/008 ,  H04L9/0618 ,  H04L9/0643 ,  H04L9/14 ,  H04L9/3073

Abstract: In a method for statistical analysis of aggregate encrypted data with key-leakage resilience for smart grids, every user area is managed by a fog node which plays the role of data aggregation gateway and data relay. All the users' electricity consumption data sent by smart meters in the same user area are firstly aggregated by the fog node to generate a fog-level aggregate ciphertext. Then the fog node further generates a digital signature for the fog-level aggregate ciphertext and sends these data to a cloud server for long-time storage. The cloud server stores all the aggregate ciphertexts and digital signatures received from different user areas in its database, and provides data query and statistical analysis services for the control center of smart grids. On the premise of without violating users' privacy, the cloud server could provide enough information for the control center, enabling it to compute the sum, arithmetic mean and variance of all users' data in specified areas in a privacy-preserving way.

公开(公告)号：US11946374B2

公开(公告)日：2024-04-02

申请号：US18347179

申请日：2023-07-05

Applicant: Southwest Petroleum University

Inventor： Yang Tang ,  Miantao Guan ,  Yulin Zhang ,  Peng Zhao ,  Guorong Wang ,  Jinhai Zhao ,  Qingyou Liu ,  Jinzhong Wang ,  Xiang Gao ,  Yufa He ,  Hu Deng ,  Liming Fan ,  Rutao Ma

IPC: E21B7/06 ,  E21B23/00 ,  E21B23/04

CPC classification number: E21B7/061 ,  E21B23/006 ,  E21B23/0411

Abstract: The disclosure relates to an omni-directional horizontally oriented deflecting tool for a coiled tubing, which includes an inner central pipe, an outer central pipe, a conical outer cylinder, a piston outer cylinder, an anchoring mechanism, a sealing mechanism, a reversing mechanism and a steering mechanism. The anchoring mechanism includes a cone, an O-shaped sealing ring I, a cone spring, a slip, a slip spring, a slip seat, a claw I and a pin shaft I, and the sealing mechanism includes a piston, an O-shaped sealing ring II, a claw II, a pin shaft II, an upper rubber cylinder seat, a rubber cylinder, a connecting cylinder, a lower rubber cylinder seat and a gasket.

公开(公告)号：US11927094B2

公开(公告)日：2024-03-12

申请号：US17551164

申请日：2021-12-14

Applicant: Southwest Petroleum University

Inventor： Jian Xiong ,  Xiangjun Liu ,  Lixi Liang ,  Yi Ding ,  Linlin Huang ,  Lianlang Hou ,  Shiqiong Liu ,  Hongqi Liu

IPC: E21B49/00 ,  G01V99/00 ,  G06F30/28 ,  E21B43/26 ,  G06F113/08

CPC classification number: E21B49/00 ,  G01V99/00 ,  G06F30/28 ,  E21B43/26 ,  E21B2200/20 ,  G06F2113/08

Abstract: A comprehensive geological-engineering classification evaluation method for low-permeability reservoirs, includes: constructing geological classification evaluation indexes of a reservoir: adopting gray correlation method to obtain main controlling factors of reservoir geology of the low-permeability reservoirs that affects fracturing effects; based on the main controlling factors of the reservoir geology, constructing the geological classification evaluation indexes of low-permeability reservoirs by principal component analysis; constructing engineering classification evaluation indexes of the reservoir: adopting gray correlation method to obtain main controlling factors of geomechanics of the low-permeability reservoirs that affects fracturing effects; based on the main controlling factors of geomechanics, constructing the engineering classification evaluation indexes of low-permeability reservoirs by an analytic hierarchy process; and according to classification limit values of the geological classification evaluation indexes of a reservoir and engineering classification evaluation indexes of a reservoir, achieving classification of reservoir types.

公开(公告)号：US20240077401A1

公开(公告)日：2024-03-07

申请号：US18494919

申请日：2023-10-26

Applicant: Southwest Petroleum University

Inventor： Min Xiong ,  Lei Chen ,  Xiucheng Tan ,  Yubing Ji ,  Qingsong Cheng

IPC: G01N15/02 ,  G06T5/40 ,  G06T5/50 ,  G06T7/11 ,  G06T7/13 ,  G06T7/136 ,  G06T7/174 ,  G06T7/194

CPC classification number: G01N15/0227 ,  G06T5/40 ,  G06T5/50 ,  G06T7/11 ,  G06T7/13 ,  G06T7/136 ,  G06T7/174 ,  G06T7/194 ,  G01N2015/0061

Abstract: The present disclosure provides a particle size statistical method of granular minerals of shale, comprising: collecting shale samples; cutting the collected samples into the size of 1 cm×1 cm×1 cm; performing argon ion polishing; magnifying the samples by the field emission scanning electron microscopy, collecting 500-1000 images; using Adobe Photoshop to seamlessly splice the collected images; using ImageJ in combination with EDS energy spectrum to determine types of mineral particles, performing background subtraction, and setting a reasonable grayscale threshold to classify the particle minerals; performing binary processing on the images of selected mineral particle types; identifying edges of granular minerals, and using a Analyze Particles command to statistically analyze and measure particle sizes, and drawing a particle size distribution histogram. The method can perform precise measurement and statistics on the particle sizes of shale particle minerals, and can perform full-scale statistical analysis on the distribution of different mineral particle sizes in the shale.

公开(公告)号：US20240068923A1

公开(公告)日：2024-02-29

申请号：US18501936

申请日：2023-11-03

Applicant: Southwest Petroleum University

Inventor： Ping YUE ,  Hongnan YANG ,  Yuan LEI ,  Xu ZHENG ,  Peng SONG ,  Pengyu CHEN ,  Zhouhua WANG ,  Simin QU

IPC: G01N15/08 ,  G01N33/24

CPC classification number: G01N15/0806 ,  G01N33/24

Abstract: A device for simulating carbon dioxide storage in a deep saline aquifer, including a CO2 gas source, first and second valves, first and second pressure pumps, first, second and third pressure gauges, a water storage tank, a simulation box, a first flow meter, a gas-liquid separator, a recycling tank, a microcomputer-display assembly, a structure plate, core holders, an injection pipeline, a connection pipeline, a baffle, a piezometer, a second flow meter, a heater, a lifter and an acoustic logging tool. The CO2 gas source, the first valve, the first pressure pump and the first pressure gauge for gas injection. The water storage tank, a second pressure pump and a second pressure gauge for water injection. The second valve, the third pressure gauge, the first flow meter, the gas-liquid separator and the recycling tank form an output pipeline.

公开(公告)号：US11912802B2

公开(公告)日：2024-02-27

申请号：US18067512

申请日：2022-12-16

Applicant: Southwest Petroleum University

Inventor： Yongming Li ,  Qiang Ren

IPC: C09K8/68 ,  C08F2/48 ,  C08F251/00 ,  C09K8/588 ,  C09K8/88

CPC classification number: C08F251/00 ,  C08F2/48 ,  C09K8/588 ,  C09K8/68 ,  C09K8/885

Abstract: A supramolecular star-shaped polymer with β-CD as a core and a preparation method thereof. The supramolecular star-shaped polymer with β-CD as a core has a β-cyclodextrin-modified branched monomer F-β-CD that serves as a core and is grafted with acrylamide, acrylic acid, hydrophobic monomers and surface-active macromolecular monomers to form a supramolecular star-shaped polymer. The hydrophobic monomer is one or more of N-benzyl-N alkyl (meth) acrylamide and N-phenethyl-N alkyl (meth) acrylamide; the surface-active macromolecular monomer is one or more of allyl polyoxyethylene ether, alkylphenol polyoxyethylene ether (meth)acrylate, allyl alkylphenol polyoxyethylene ether, alkyl alcohol polyoxyethylene ether (meth)acrylate and allyl alkyl alcohol polyoxyethylene ether. The method has cheapness and easiness to obtain raw materials, ease to control synthesis conditions, and high yield. The present invention has excellent tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, so that it shows good application prospects in the aspect of enhancing recovery ratios and hydraulic fracturing in oilfields.

公开(公告)号：US11834928B1

公开(公告)日：2023-12-05

申请号：US17936141

申请日：2022-09-28

Applicant: Southwest Petroleum University ,  Sichuan Xieming Technology Co., Ltd.

Inventor： Jialin Tian ,  Haolin Song ,  Yinglin Yang ,  Yanniu Ren ,  Lin Yang ,  Zhe Zhang ,  Bo He ,  Jun Li ,  Yu Wei ,  Lei Cha

IPC: E21B4/02 ,  E21B4/14 ,  E21B4/00

CPC classification number: E21B4/02 ,  E21B4/003 ,  E21B4/14

Abstract: A drill string rotation controller includes an anti-torque balance module, a TC bearing retaining ring, an upper TC bearing, an upper thrust ball bearing, an upper Haval ring, a middle seal retaining ring, an upper mandrel, an upper shell, a rotary control cylinder, an upper spring, a spline shell, a spline sleeve, a spline mandrel, a lower shell, a spring push sleeve, a lower spring, a floating piston, a lower mandrel, a bulkhead, a lower thrust ball bearing, a lower Haval ring, a lower TC bearing, a conversion joint, an anti-drop joint, a lower joint, and a control pin. The rotary control cylinder causes the spline sleeve to switch the transmission relationship between the spline mandrel and shell. Therefore, the drill string rotation controller controls the conversion between the composite drilling mode and the directional drilling mode.

公开(公告)号：US11828733B2

公开(公告)日：2023-11-28

申请号：US17690018

申请日：2022-03-09

Applicant: Southwest Petroleum University

Inventor： Duo Hou ,  Zhongling Xiao ,  Zhi Zhang ,  Jian Ding ,  Jiawei Wang ,  Taihe Shi

IPC: G01N3/02 ,  G01M3/00 ,  G01M3/26 ,  G01N33/38 ,  E21B47/005 ,  E21B43/116

CPC classification number: G01N3/02 ,  G01M3/002 ,  G01M3/26 ,  G01N33/383 ,  E21B43/116 ,  E21B47/005

Abstract: The invention discloses a device for testing strength and sealing performance of cement sheath after perforation, comprising a cement sheath curing maintenance simulation component, a perforation operation simulation component, and a cement sheath performance test component. By simulating the detonation effect and fluid-solid coupling effect, quantitatively testing the internal transverse crack and longitudinal crack propagation size, compressive strength and tensile strength, permeability, blowby pressure, blowby velocity and other parameters of the cement sheath, drawing the relation curve between different perforation distances and the maximum blowby pressure and permeability of the cement sheath, determining the perforation distance Hp where the blowby of the cement sheath does not occur, determining the perforation distance HK to ensure the sealing of the cement sheath, and using min (Hp, HK), the critical perforation distance that the cement sheath has sufficient strength to prevent blowby and meet the sealing requirements can be determined.

公开(公告)号：US20230376657A1

公开(公告)日：2023-11-23

申请号：US18153018

申请日：2023-01-11

Applicant: Southwest Petroleum University

Inventor： Yu PENG ,  Pengjun SHI ,  Yongming LI ,  Weihua CHEN ,  Fei LIU ,  Ji ZENG

IPC: G06F30/28

CPC classification number: G06F30/28 ,  G06F2111/10

Abstract: The present invention discloses an evaluation method for acid fracturing effect based on the theory of acid-frac “stimulated zone”, comprising the following steps: establish a structured reservoir grid, and add initial artificial fractures to the structured reservoir grid; establish a fracture propagation model considering the acid-frac stimulated zone, on the basis of the structured reservoir grid, conduct numerical simulation according to the fracture propagation model, and work out the seepage parameters during acid fracturing; establish a gas well production model, and calculate the pore distribution and liquid saturation distribution of the reservoir in gas well production; calculate the cumulative production of the gas well, and calculate the multiple proportion of cumulative production increase of the construction plan according to the cumulative production of the gas well; the greater the multiple proportion, the better the acid fracturing effect.