公开(公告)号：US20200300082A1

公开(公告)日：2020-09-24

申请号：US16899546

申请日：2020-06-11

Applicant: SOUTHWEST PETROLEUM UNIVERSITY ,  PETROCHINA COMPANY LIMITED

Inventor： Pingli Liu ,  Xiang Chen ,  Heng Xue ,  Honglan Zou ,  Liqiang Zhao ,  Nianyin Li ,  Daocheng Wang ,  Zhifeng Luo ,  Juan Du ,  Chong Liang ,  Mingyue Cui ,  Fei Liu ,  Changlin Zhou ,  Rong Zeng

IPC: E21B47/10 ,  E21B43/27 ,  G06F30/28 ,  G06F17/11

Abstract: The invention discloses a calculation method for dynamic fluid loss of acid-etched fracture considering wormhole propagation, which is applied to pad acid fracturing process, comprising the following steps: Step 1: dividing the construction time T of injecting acid fluid into artificial fracture into m time nodes at equal intervals, then the time step Δt=T/m and tn=nΔt, where, n=0, 1, 2, 3, . . . , m, and to is the initial time; Step 2: calculating the fluid loss velocity vl(0) in the fracture at t0; Step 3: calculating the flowing pressure distribution P(n) in the fracture at tn; Step 4: calculating the width wa(n) of acid-etched fracture at tn; Step 5: calculating the wormhole propagation and the fluid loss velocity vl(n) at tn; Step 6: substituting the fluid loss velocity vl(n) into Step 3, and repeating Step 3 to Step 6 in turn until the end of acid fluid injection.

公开(公告)号：US11781062B1

公开(公告)日：2023-10-10

申请号：US17844731

申请日：2022-06-21

Applicant: Southwest Petroleum University ,  Tianjin Branch of CNOOC (China) Co., Ltd

Inventor： Pingli Liu ,  Jun Li ,  Jian Yang ,  Jianfa Wu ,  Shang Gao ,  Xingwu Guo ,  Jian Zou ,  Xitang Lan ,  Liping Zhang ,  Zhifeng Luo ,  Lan Ren ,  Changlong Liu ,  Juan Du ,  Xiang Chen ,  Nianyin Li ,  Peng Wang

IPC: C09K8/80 ,  C09K8/60 ,  C09K8/68

CPC classification number: C09K8/80 ,  C09K8/605 ,  C09K8/608 ,  C09K8/68 ,  C09K2208/08 ,  C09K2208/10 ,  C09K2208/28

Abstract: The present invention relates to a bionics-based efficiently transported and packed proppant and preparation method thereof, comprising enhanced fracturing fluid and biomimetic dandelion proppant; the mass ratio of the enhanced fracturing fluid and the biomimetic dandelion is: 1-2:100-400; the 100 pbw of enhanced fracturing fluid includes 0.1-1 pbw of drag reducing agent, 0.01-0.1 pbw of cleanup additive, 0.2-0.8 pbw of clay stabilizer, 0.01-0.05 pbw of bactericide, 0.01-0.2 pbw of nanoparticle enhancer, and water; the biomimetic dandelion proppant consists of modified proppant and modified fiber, and the mass ratio between the modified proppant and the modified fiber is 99-99.9:0.1-1.

公开(公告)号：US12116437B1

公开(公告)日：2024-10-15

申请号：US18590881

申请日：2024-02-28

Applicant: Southwest Petroleum University

Inventor： Pingli Liu ,  Chengjie Wang ,  Jinzhou Zhao ,  Juan Du ,  Xiang Chen ,  Xianyu Song ,  Guan Wang

IPC: C08F220/38 ,  C10G75/04

CPC classification number: C08F220/387 ,  C10G75/04 ,  C10G2300/4075

Abstract: The present invention provides an asphaltene dispersion stabilizer and a preparation method therefor, and relates to the technical field of oilfield additives. The asphaltene dispersion stabilizer is prepared by the following method: taking iminodisuccinic acid or salt thereof, and performing Michael addition reaction on the iminodisuccinic acid or the salt thereof and unsaturated sulfonate to prepare a first intermediate; taking the first intermediate, and performing amidation reaction on the first intermediate and a first monomer under the action of a catalyst to obtain a second intermediate; and preparing a dendrimer by taking the second intermediate as a core and taking a second monomer and a third monomer as raw materials, wherein the dendrimer is the asphaltene dispersion stabilizer, and the generation number of the dendrimer is 0.5 generations, 1.5 generations or 2.5 generations. The asphaltene dispersion stabilizer of the present invention has a good dispersion stabilization effect on asphaltene.