公开(公告)号：US11614561B1

公开(公告)日：2023-03-28

申请号：US17859240

申请日：2022-07-07

Applicant: Southwest Petroleum University

Inventor： Yongming Li ,  Tai Chang ,  Yu Peng ,  Huohai Yang ,  Guowei Deng ,  Juhui Zhu ,  Cheng Chang

IPC: G01V99/00 ,  G01G11/00 ,  E21B43/16 ,  E21B49/00 ,  G01N15/08 ,  G01N13/04

Abstract: A glass clamping model based on microscopic displacement experiment, including a frame, a transparent silicone sleeve having a horizontal through hole, a piston, a piston cap arranged on the frame, a connecting plate, a screw compression bracket, a clamp support, a glass sheet entirety placed in the transparent silicone sleeve, a boss, a light source and a microscope. The transparent silicone sleeve is sheathed on the piston cap, the piston penetrates through the horizontal penetration hole; the connecting plate and the clamp support are respectively connected to both ends of the frame, the end of the screw compression bracket is clamped between the frame and the connecting plate, and the piston and the frame are connected with the clamp support; an emptying channel and an inlet passage are respectively arranged at both ends of the piston, and an outlet passage is arranged at an end of the piston.

公开(公告)号：US11125068B2

公开(公告)日：2021-09-21

申请号：US17226078

申请日：2021-04-09

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Youshi Jiang ,  Yan Kou ,  Yongming Li ,  Zhibin He ,  Jing Jia ,  Wang Tang ,  Ang Luo ,  Bo Chen

IPC: E21B43/267 ,  C09K8/80

Abstract: The present invention relates to a channel fracturing method with alternative injection of conventional and capsule-type soluble proppants. The method includes the following steps: injecting pad fluid into a wellbore to break a formation and form fractures in the formation; alternately injecting a sand-carrying fluid containing conventional proppant and a sand-carrying fluid containing capsule-type soluble proppant into the wellbore in sequence to support fractures in the formation and continue to fracture the formation; injecting displacement fluid into the wellbore to completely displace the sand-carrying fluids in the wellbore into the fractures. The conventional proppant of less dosage is used. The capsule-type soluble proppant is less difficult to be developed and its solubility is sensitive to the fracture closure, which is conducive to the quick flowback after fracturing. The channel fracturing technology is more mature, reliable, and cost-effective, and the concept of forming high-conductivity channel is more simple and effective.

公开(公告)号：US20210222537A1

公开(公告)日：2021-07-22

申请号：US17226078

申请日：2021-04-09

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Youshi Jiang ,  Yan Kou ,  Yongming Li ,  Zhibin He ,  Jing Jia ,  Wang Tang ,  Ang Luo ,  Bo Chen

IPC: E21B43/267 ,  C09K8/80

Abstract: The present invention relates to a channel fracturing method with alternative injection of conventional and capsule-type soluble proppants. The method includes the following steps: injecting pad fluid into a wellbore to break a formation and form fractures in the formation; alternately injecting a sand-carrying fluid containing conventional proppant and a sand-carrying fluid containing capsule-type soluble proppant into the wellbore in sequence to support fractures in the formation and continue to fracture the formation; injecting displacement fluid into the wellbore to completely displace the sand-carrying fluids in the wellbore into the fractures. The conventional proppant of less dosage is used. The capsule-type soluble proppant is less difficult to be developed and its solubility is sensitive to the fracture closure, which is conducive to the quick flowback after fracturing. The channel fracturing technology is more mature, reliable, and cost-effective, and the concept of forming high-conductivity channel is more simple and effective.

公开(公告)号：US20210088429A1

公开(公告)日：2021-03-25

申请号：US16879156

申请日：2020-05-20

Applicant: Southwest Petroleum University

Inventor： Yongming Li ,  Bo Chen ,  Zixi Guo

IPC: G01N3/10 ,  G01N3/06 ,  G01N33/24

Abstract: A device and method for evaluating fracture initiation and propagation, and a stress sensitivity of a propped fracture is provided. The device includes a core part, a confining pressure loading part, a fracturing fluid pumping part, a stress sensitivity testing part and a fracture monitoring part. The method evaluates fracture initiation and propagation, and a stress sensitivity of a propped fracture using the above device and is reliable and simple to operate and guides optimization of construction parameters of hydraulic fracturing, thus achieving improvement in productivity of an oil and gas well.

公开(公告)号：US10921228B2

公开(公告)日：2021-02-16

申请号：US16747492

申请日：2020-01-20

Applicant: Southwest Petroleum University

Inventor： Youshi Jiang ,  Fujian Liu ,  Yongming Li ,  Bo Chen ,  Jinzhou Zhao

IPC: G01N9/10 ,  G05B19/416

Abstract: A testing device and method for floating rate of floating agent for fracture height control are provided. The test device includes a support frame, a glass tube vertically fixed on the support frame, a floating agent storage container, a control valve, and a liquid storage tank, wherein multiple circular holes are uniformly distributed along an axial direction of the glass tube, and multiple turbidimeters for measuring liquid turbidity are sequentially mounted on the circular holes. The liquid storage tank communicates with an inner cavity of an upper end of the glass tube through a pipeline, and the floating agent storage container is connected to an inner cavity of a lower end of the glass tube through a control valve. The present invention increases accuracy of measured floating rate of the floating agent, and provides reliable floating data of the floating agent for oil and gas reservoir reconstruction.

公开(公告)号：US12158063B2

公开(公告)日：2024-12-03

申请号：US18541285

申请日：2023-12-15

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Xiyu Chen ,  Jingze Li ,  Yongming Li ,  Tai Chang ,  Le He ,  Juhui Zhu

IPC: E21B43/26 ,  E21B47/06

Abstract: A method for predicting a risk of early screen-out in a near-well zone based on distributed fiber acoustic sensing (DAS) is provided. The method comprises: obtaining an acoustic signal during a fracturing process based on distributed optical fibers deployed in a well to be fractured, and obtaining pressure monitoring data based on at least one sensor deployed in the well to be fractured; determining, based on a location of a perforation cluster, and an acoustic signal of the perforation cluster, fracturing fluid flow velocity data of the perforation cluster by a first predetermined algorithm; determining, based on the fracturing fluid flow velocity data of the perforation cluster and perforation parameters of the perforation cluster, a perforation friction resistance pressure drop of the perforation cluster by a second predetermined algorithm; determining a near-well friction resistance pressure drop of the perforation cluster based on a fluid pressure, the perforation friction resistance pressure drop, a slit fluid pressure; determining a near-well friction resistance coefficient of the perforation cluster based on the near-well friction resistance pressure drop of the perforation cluster; and determining, based on the near-well friction resistance coefficient, whether the perforation cluster has the risk of early screen-out in the near-well zone.

公开(公告)号：US12134735B1

公开(公告)日：2024-11-05

申请号：US18537488

申请日：2023-12-12

Applicant: Southwest Petroleum University

Inventor： Yongming Li ,  Yadong Chen ,  Jiandu Ye ,  Dingyuan Zhang

IPC: C09K8/82

Abstract: The present invention relates to a low-shrinkage and high-strength plant-based resinous blocking agent and preparation method thereof, and belongs to the technical field of oilfield development. The resinous blocking agent consists of the following substances according to weight parts: 37.2˜47.8 parts of epoxy plant oil, 19.8˜37.2 parts of benzoxazine, 22.9˜31.6 parts of curing agents, 0.8˜1.8 parts of initiators, 1.2˜1.8 parts of toughening agents, 0.5˜1.2 parts of reinforcing agents, wherein the sum of the weight parts of the above substances is 100 parts, the epoxy plant oil is obtained through epoxidation on unsaturated carbon-carbon double bonds in a molecule of dehydrated plant oil; the benzoxazine is synthesized from long-chain diamine, monohydric plant phenol and paraformaldehyde. The blocking agent has the advantages such as high compressive strength, degradability, low shrinkage and excellent plugging performance, is easy to obtain cheap raw materials and controllable to a preparation process, can meet the requirements of oil-gas reservoirs for high-strength blocking agents, and has a broad market prospect.

公开(公告)号：US11692423B1

公开(公告)日：2023-07-04

申请号：US17694527

申请日：2022-03-14

Applicant: Southwest Petroleum University

Inventor： Xiyu Chen ,  Yitao Huang ,  Yongming Li ,  Huibo Wen ,  Yu Peng ,  Youshi Jiang ,  Jinzhou Zhao

IPC: E21B43/267 ,  E21B43/26

CPC classification number: E21B43/261 ,  E21B43/267 ,  E21B2200/20

Abstract: The present invention discloses a method for realizing uniform stimulation for the oil and gas well by low-cost multi-stage fracturing, comprising the following steps: first calculate and predict the inlet widths of the fracture created in the planned hydraulic fracturing; then design the plugging scheme for blocking the fracture inlet after each fracturing treatment; the selected plugging particles are composed of filling particles and skeleton particles, with designed plugging scheme; after complete the design of plugging scheme, perform the fracturing treatment to create hydraulic fracturing in the reservoir; skeleton particles and filling particles are added into the fractures successively according to plan. The present invention provides a multi-stage single-cluster fracturing method, with the advantages of controllable fracture sizes and low cost. The present invention can realize a good uniformity of stimulation for the oil and gas wells.

公开(公告)号：US11459418B2

公开(公告)日：2022-10-04

申请号：US16622840

申请日：2018-11-20

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Qiang Ren ,  Yongming Li ,  Youshi Jiang

IPC: C08F220/06 ,  C08F220/56 ,  C08F290/04 ,  C08K5/07 ,  C09K8/588

Abstract: A quadripolymer based on host-guest interaction and prepared in the steps including (1) weigh maleic anhydride and dissolve in dichloromethane, add β-phenethylamine dropwise, stir to react for 1 to 3 hours, perform extraction filtration and washing, to obtain N-phenethylmaleamic acid; (2) weigh mono 6-ethylenediamine β-cyclodextrin and maleic anhydride, dissolve in N, N-dimethylformamide, and place at 40° C. for reaction for 3 to 6 hours, the product is precipitated with chloroform, washed and dried under vacuum to obtain maleic anhydride modified mono 6-ethylenediamine β-cyclodextrin; (3) Add acrylamide, acrylic acid, maleic anhydride modified mono 6-ethylenediamine β-cyclodextrin, N-phenethylmaleamic acid, adjust the pH of the solution to 7; introduce nitrogen, add a photoinitiator and place to a photo-initiating device to react 3˜5 hours at a temperature of 10˜30° C. The quadripolymer has good temperature and salt resistance, shear resistance. The raw materials are cheap and easily available. The reaction conditions are mild.

公开(公告)号：US11280172B2

公开(公告)日：2022-03-22

申请号：US17513923

申请日：2021-10-29

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Yu Peng ,  Ang Luo ,  Yongming Li ,  Qing Yin ,  Hu Jia ,  Xiyu Chen

IPC: E21B49/00 ,  E21B43/26 ,  E21B43/267 ,  E21B49/08 ,  G01N3/08

Abstract: The present invention discloses a method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs, comprising: (1) selecting a rock sample of target reservoir for creep experiment, and plotting ε-t curve of the rock sample during creep; (2) fitting the fractional Kelvin model with the ε-t curve of the rock sample during creep; (3) calculating the conductivity and permeability of hydraulic fracture considering creep damage; (4) numerically solving the productivity model, calculating the cumulative gas production of the gas well produced up to time t, and calculating the creep damage rate for cumulative production of the gas well; (5) repeating Steps (3) to (4), calculating the creep damage rate for cumulative production for the cases of hydraulic fracture sanding concentration N of 5 kg/m2, 7.5 kg/m2, 10 kg/m2, 12.5 kg/m2 and 15 kg/m2 respectively, plotting the creep damage chart of cumulative production.