公开(公告)号：US11345844B2

公开(公告)日：2022-05-31

申请号：US16887336

申请日：2020-05-29

Applicant: SOUTHWEST PETROLEUM UNIVERSITY ,  SOUTHWEST PETROLEUM UNIVERSITY ENVIRONMENTAL PROTECTION TECHNOLOGY (CHENGDU) CO., LTD

Inventor： Xiaowei Cheng ,  Gaoyin Zhang ,  Shunxiang Luo ,  Zuwei Chen ,  Sheng Huang ,  Kaiqiang Liu ,  Chunmei Zhang ,  Kaiyuan Mei ,  Jian Liu ,  Zaoyuan Li ,  Xiaoyang Guo

IPC: C09K8/467 ,  C04B18/12 ,  C04B20/02 ,  C04B20/04 ,  E21B21/01

Abstract: An oil well cement slurry high-temperature suspension stabilizer prepared from oil-based shale drilling cuttings is provided. The high-temperature suspension stabilizer is reasonable in principle, inexpensive and easily available in raw materials, high in product uniformity and good in chemical stability. Meanwhile, waste is changed into wealth. Therefore, the high-temperature suspension stabilizer is environment-friendly and has a broad industrial application prospect.

公开(公告)号：US20250043644A1

公开(公告)日：2025-02-06

申请号：US18789724

申请日：2024-07-31

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： GANG HU ,  ZONGYU WEN ,  GUORONG WANG ,  YUHU XU ,  HONGLIN LIAO

IPC: E21B23/00 ,  E21B49/08

Abstract: This invention discloses an intelligent water detection tool for horizontal wells, including a water detection instrument, and also including a floating-diving component for driving the movement of the water detection instrument, a buoyancy device connected to the water detection instrument, and a buoyancy adjustment component for adjusting the water displacement volume of the buoyancy device. This invention provides an intelligent water detection tool for horizontal wells, using a completely different technical approach to achieve floating-diving style water detection operations in horizontal well sections, aiming to reduce tool friction and facilitate easy passage through horizontal sections.

公开(公告)号：US12196725B2

公开(公告)日：2025-01-14

申请号：US18055819

申请日：2022-11-15

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Duo Hou ,  Zhi Zhang ,  Zhongling Xiao ,  Huabo Yang ,  Jian Ren ,  Taihe Shi

IPC: G01N3/56 ,  E21B47/005 ,  G01N3/12 ,  G01N25/00

Abstract: The embodiments of the present disclosure disclose an evaluation apparatus and a method for seal integrity of a wellbore in a full life cycle. The apparatus may include an oil pipe temperature and pressure simulation assembly, an oil casing annular temperature and pressure simulation assembly, a formation confining pressure simulation assembly, a casing-cement sheath-formation combination preparation assembly, a blowby characteristic detection assembly, and a monitoring system. The present disclosure may crustal stress quickly complete scanning of cement slurry system and maintenance and preparation of casing-cement sheath-formation combination, intelligent monitor blowby pressure of cement sheath in real time, test the critical blowby pressure curve of cement sheath of oil and gas wells under various production conditions throughout the life cycle for evaluating the seal integrity of wellbore, and provide technical support for the formulation of wellbore safeguard measures.

公开(公告)号：US12180409B1

公开(公告)日：2024-12-31

申请号：US18824209

申请日：2024-09-04

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Yu Peng ,  Pengjun Shi ,  Yongming Li ,  Zhenglan Li ,  Jiandu Ye ,  Jinzhou Zhao

IPC: C08F220/06 ,  C08F220/20 ,  C08F220/58 ,  C09K5/06 ,  C09K8/00 ,  C08K3/34 ,  C08K3/38 ,  C09K8/24 ,  C09K8/512

Abstract: The present invention discloses a double-crosslinked thermal phase transition gel temporary plugging agent and an application thereof, and relates to the technical field of oil and gas field development. The gel temporary plugging agent comprises the following components in percentage by weight: 5.8-18.3% of acrylic acid, 2.8-6.5% of 2-acrylamide-2-methylpropanesulfonic acid, 2.8-7.0% of hydroxyethyl acrylate, 0.2-1.0% of a degradable crosslinking agent, 0.4-1.2% of borax or boric acid, 0.2-0.8% of a high-temperature initiator, 2.6-4.5% of palygorskite attapulgite, 1.5-3.1% of a urea-formaldehyde resin, and the balance of water, wherein the gel temporary plugging agent is formed by underground gelation. The gel temporary plugging agent is applied to oil and gas reservoirs with a temperature of 100-150° C., can automatically be subjected to gelation and degradation, and has a low filtration loss before gelation.

公开(公告)号：US12168752B2

公开(公告)日：2024-12-17

申请号：US18402787

申请日：2024-01-03

Applicant: Southwest Petroleum University

Inventor： Kun Wang ,  Shouxin Wang ,  Jianchun Guo ,  Chi Chen ,  Tao Zhang ,  Xiang Bai ,  Xinghao Gou ,  Jichuan Ren ,  Cong Lu ,  Bo Gou ,  Jie Lai

IPC: C09K8/72

Abstract: The present invention discloses a novel high-temperature visual acid etching test device and method; the test device includes a visual rock slab holder, an acid solution storage tank I, an acid solution storage tank II, a heating apparatus, a high-pressure water pump, a low-pressure acid pump, a back-pressure valve, an acid valve A, an acid valve B, an acid valve C, an acid valve D, an acid valve E, an acid valve F, a water valve G, a water valve H, a water valve I, a water valve J, and a water valve K; both the acid solution storage tank I and the acid solution storage tank II are provided with a piston therein, where the acid solution storage tank is divided into upper and lower independent parts by the piston. According to the present invention, the flowing process of an acid solution in a fracture can be directly observed to accurately characterize the distribution of the acid solution in the fracture, which facilitates a study on an acid etching mechanism. According to the present invention, an acid solution injection system is separated from a water injection system, so that only water is injected into the system through a high-pressure pump, effectively solving safety problems of acid solution pumping. In the test process of the present invention, a totally-enclosed acid solution system can ensure that the acid solution does not overflow at high temperature and high pressure, thus greatly increasing the safety of the test.

公开(公告)号：US12163905B2

公开(公告)日：2024-12-10

申请号：US18167712

申请日：2023-02-10

Applicant: Southwest Petroleum University

Inventor： Ping Guo ,  Zheng Gu ,  Shuoshi Wang ,  Zhouhua Wang ,  Qinglong Xu ,  Shiyong Hu ,  Wenhua Zhao ,  Yisheng Hu ,  Huang Liu ,  Hanmin Tu

IPC: G01N24/08 ,  G01N1/42 ,  G01N1/44

Abstract: A method for determining a phase-state type and saturation of a fluid by an NMR technology includes putting a core to be measured to an NMR phase-state testing device, injecting a heavy water solution from both ends of a gripper at the same time until the core reaches the formation pressure, and stopping; scanning the core to obtain a two-dimensional NMR map, and determining whether the core contains a gas phase; reducing the temperature of the gripper, and collecting an oil phase volume, a gas phase volume and a water phase volume discharged from the core; purge the pipelines out with nitrogen, collecting a water phase volume and an oil phase volume in the pipelines; performing dry distillation on the core to obtain an oil phase volume and a water phase volume; and obtaining the saturations of various phases according to the fluid volumes of multiple phases in the core.

公开(公告)号：US12123996B2

公开(公告)日：2024-10-22

申请号：US18544379

申请日：2023-12-18

Applicant: Southwest Petroleum University

Inventor： Yonghui Liu ,  Jinhong Jiang ,  Chengcheng Luo ,  Ning Wu ,  Xuanzhi Zheng ,  Xinke Tang ,  Xin Li ,  Zhengyang Liu ,  Boren Yang ,  Tianjian Liu

IPC: G01V11/00

CPC classification number: G01V11/002

Abstract: The present disclosure provides a method for experimentally determining a critical sand-carrying gas velocity of a shale gas well. The method includes: collecting well structure and production data, calculating parameter ranges of a gas flow velocity and a liquid flow velocity; carrying out a physical simulation experiment of sand carrying in the shale gas well to obtain the sand holding capacity of the wellbore under different experimental conditions, and calculating a sand holding rate; by observing a change curve of the sand holding rate of the wellbore vs. the gas flow velocity, defining a turning point, and sensitively analyzing the influence of other experimental variables on the turning point, to calculate the critical sand-carrying production of the shale gas well under different conditions. Therefore, this calculation method is simple and applicable, and provides a theoretical basis for the optimization design of water drainage and gas production process.

公开(公告)号：US12117385B1

公开(公告)日：2024-10-15

申请号：US18314395

申请日：2023-05-09

Applicant: Southwest Petroleum University

Inventor： Youwei He ,  Yu Qiao ,  Jiazheng Qin ,  Yong Tang ,  Ning Wang ,  Guoqing Zhao

IPC: G01N15/08 ,  E21B49/00 ,  G01N33/24

CPC classification number: G01N15/088 ,  E21B49/00 ,  G01N33/24 ,  E21B2200/20

Abstract: Disclosed is a method for evaluating the underground hydrogen storage (UHS) capacity in porous media of depleted gas reservoirs using CO2 as cushion gas, including the following steps: S1: obtaining physical parameters required for UHS capacity evaluation based on geological and production data of the target depleted gas reservoir; S2: calculating the cap-rock breakthrough pressure and fault-slip pressure of the UHS based on the cap and fault properties of the target depleted gas reservoir to further estimate the highest operating pressure of the UHS; S3: developing the H2—CO2—CH4 multi-component material balance equation in underground porous media by considering the dissolution of three components in formation water; S4: substituting the parameters obtained from S1 and S2 into the multi-component material balance equation to calculate the proportion of different gas components in the pore space to finally determine the UHS capacity of the target depleted gas reservoir.

公开(公告)号：US12116888B1

公开(公告)日：2024-10-15

申请号：US18523841

申请日：2023-11-29

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Dong Xiao ,  Hongyu Xiao ,  Gao Li ,  Mingjie Liu ,  Pan Fang ,  Yachuan Liu

IPC: E21B47/12 ,  E21B21/08

CPC classification number: E21B47/138 ,  E21B21/08 ,  E21B2200/20

Abstract: The present disclosure provides an impact simulation device and simulation method for characteristics of a rock chip bed in a large displacement well. The device comprises a wellbore system, a drilling fluid circulation system, a rock chip transportation system, a drill pipe control system, a data acquisition system, and a data processing system. The wellbore system is configured to simulate a horizontal annulus environment for rock chip transportation during drilling. The drilling fluid circulation system is configured to provide drilling fluid to the wellbore system and collect flow data of the drilling fluid. The rock chip transportation system is configured to simulate an output of rock chips in the horizontal annulus environment during drilling and recover the rock chips. The drill pipe control system is configured to implement drilling simulation in the wellbore system. The data acquisition system is configured to collect monitoring data during the drilling simulation and to transmit the monitoring data to the data processing system. The data processing system is configured to determine ECD correction parameters based on the monitoring data.

公开(公告)号：US20240337579A1

公开(公告)日：2024-10-10

申请号：US18632242

申请日：2024-04-10

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Yisheng HU ,  Lei PU ,  Jin WANG ,  Chenhui SHI

IPC: G01N15/08 ,  G01N29/024 ,  G01N29/14 ,  G01N33/24

CPC classification number: G01N15/0826 ,  G01N15/0806 ,  G01N29/024 ,  G01N29/14 ,  G01N33/24

Abstract: Embodiments of the present disclosure provide a displacement device, comprising a plate model, a cylinder, a circulation component, a confining pressure pump, a displacement component, an acoustic detection component, and a pipeline component. The plate model includes a model cavity and a rock plate disposed in the model cavity, and the rock plate is provided with a sealing member on a surface. The sealing member is provided with an electrode sheet, and acoustic waves generated by the acoustic detection component pass through the rock plate and are received by an acoustic reception assembly. The confining pressure pump applies a confining pressure on the plate model. The pipeline component includes an inner pipeline and an outer pipeline, and a fluid is provided between the outer and the inner pipelines. Cables of the acoustic detection component are provided inside the inner pipeline and are connected to the outside through the inner pipeline.