公开(公告)号：US12060519B1

公开(公告)日：2024-08-13

申请号：US18603436

申请日：2024-03-13

Applicant: Southwest Petroleum University

Inventor： Yu Peng ,  Jiandu Ye ,  Yongming Li ,  Pengfei Chen ,  Pengjun Shi

IPC: C09K8/42

CPC classification number: C09K8/426

Abstract: The present invention discloses a plant-based self-degradable gel diverting agent and a preparation method therefor. The preparation method comprises the following steps: adjusting a pH of a formaldehyde solution, adding urea in three batches, heating and stirring, adding furfural in the process of adding a second batch of urea until a plant-based urea-formaldehyde resin is obtained through the reaction, completely dissolving starch in water, uniformly stirring to obtain a gelatinized starch solution, adding the plant-based urea-formaldehyde resin, adding a curing agent, and uniformly stirring, mixing and curing to obtain a product. The resin plugging agent is a liquid homogeneous system and has a low initial viscosity; the system is particle-free, can enter tiny slits; and the gel temporary plugging agent does not need to be added with a gel breaker at a temperature of 100-180° C., the temporary plugging agent can be completely degraded.

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：US11604132B1

公开(公告)日：2023-03-14

申请号：US17837499

申请日：2022-06-10

Applicant: Southwest Petroleum University

Inventor： Yu Peng ,  Yitao Huang ,  Yongming Li ,  Ang Luo ,  Pengjun Shi

IPC: G01N15/08 ,  G01N33/24

Abstract: The present invention discloses a testing device and evaluation method for sensitivity damage of core permeability tensor, comprising the following steps: first, obtain the cubic experimental rock samples and calculate the formation pressure distribution based on the reservoir geological data; then simulate the true stress and strain state of core in formation through triaxial stress loading, design the acid liquor, alkali liquor, inorganic salt solution, formation water and different displacement rates for displacement experiments, realize the determination of core three-directional permeability tensor under the same experimental conditions through three-directional sequential displacement, process the experimental data through Darcy's law, and calculate the damage degree of core permeability tensor under different sensitivity conditions of triaxial stress state; finally, identify the real-time flow state of fluid through permeability tensor synthesis, and realize the accurate and efficient testing and evaluation on permeability tensor sensitivity of reservoirs.

公开(公告)号：US11598205B1

公开(公告)日：2023-03-07

申请号：US17837545

申请日：2022-06-10

Applicant: Southwest Petroleum University

Inventor： Yu Peng ,  Ang Luo ,  Yongming Li ,  Pengjun Shi ,  Hu Jia ,  Cheng Chang

IPC: E21B49/00 ,  E21B43/26 ,  G01V99/00

Abstract: The present invention discloses a method for comprehensive evaluation of shale fracability under the geology-engineering “double-track” system, comprising the following steps: S1: Divide the target horizontal fracturing interval into multiple sampling sections; S2: Establish the reservoir property evaluation factor of each sampling section, and calculate the geological evaluation index of the target horizontal fracturing interval according to the reservoir property evaluation factor of each sampling section; S3: Establish the brittleness factor, natural fracture factor and natural fracture opening factor of each sampling section, and then establish the engineering evaluation index of each sampling section according to these factors; S4: Calculate the engineering evaluation index of the target horizontal fracturing interval according to the engineering evaluation factor of each sampling section; S5: Evaluate the fracability of the target horizontal fracturing interval according to the geological evaluation index and the engineering evaluation index.