US 12,704,451 B2Granted

Method and device for predicting ability of the temporary plugging agent to plug cracks and storage medium

AssigneeBeijing Institute of Petrochemical Technology

InventorsDaobing Wang, Bo Yu, Haiyan Zhu, Fujian Zhou, Dongliang Sun, Xiongfei Liu, Tiankui Guo, Xiuhui Li, Xuanhe Tang, Xian Shi, Qing Liu, Yu Suo, Yang Shi

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Abstract

The present disclosure relates to a method and a device for predicting ability of a temporary plugging agent to plug cracks and a storage medium, and includes the following steps: calculating a plane elastic modulus of a core through experiments, acquiring a maximum force load of a specimen, calculating rock fracture toughness through the maximum force load, manufacturing an artificial crack model and placing it in a core holder, preparing temporary plugging deflection fluid by selecting a temporary plugging agent, injecting the temporary plugging deflection fluid into the artificial crack so as to calculate apparent fracture toughness of the temporarily plugged crack, and finally calculating a fracture pressure of the temporarily plugged crack based on the calculated rock fracture toughness and the plane elastic modulus of the core. Through the above method, the present disclosure provides a standard fracture pressure calculation method.

Claims10

Dependent claims

A method for predicting ability of a temporary plugging agent to plug cracks, comprising:

acquiring an elastic modulus E and a Poisson's ratio v of a core through experiments, and acquiring a plane elastic modulus E′ of the core through the elastic modulus E and the Poisson's ratio v;
prefabricating an initial crack with a certain length on a fracture toughness specimen to acquire a maximum force load Pmax of the fracture toughness specimen;
acquiring rock fracture toughness KIC through the length of the initial crack and the maximum force load Pmax;
preparing an artificial crack model with a crack width of w and a crack height of H, and placing the artificial crack model in a core holder;
preparing temporary plugging deflection fluid by selecting any temporary plugging agent, applying a confining pressure Pc to the core holder, injecting the prepared temporary plugging deflection fluid into the crack with the width of w in the artificial crack model in the core holder at a certain rate, and temporarily plugging the crack;
acquiring the thickness wc of a filter cake forming a temporary plugging body in the crack with the width of w, and calculating apparent fracture toughness
k
p
c
of the temporarily plugged crack through the rock fracture toughness KIC, the plane elastic modulus E′ of the core, the thickness wc of the filter cake and the confining pressure Pc;
acquiring a fracture pressure
p
tip
c
of the temporarily plugged crack through the apparent fracture toughness
k
p
c
and the crack height H, and predicting the ability of the selected temporary plugging agent to plug cracks by the fracture pressure
p
tip
c
of the temporarily plugged crack.

20 more elements

A device for predicting ability of a temporary plugging agent to plug cracks, comprising:

a plane elastic modulus acquiring module, which is configured to acquire an elastic modulus E and a Poisson's ratio v of a core through experiments, and acquire a plane elastic modulus E′ of the core through the elastic modulus E and the Poisson's ratio v;
a maximum force load acquiring module, which is configured to prefabricate an initial crack with a certain length on a fracture toughness specimen to acquire a maximum force load Pmax of the fracture toughness specimen;
a rock fracture toughness acquiring module, which is configured to acquire rock fracture toughness KIC through the length of the initial crack, geometric parameters of the fracture toughness specimen and the maximum force load Pmax;
an artificial crack model preparing module, which is configured to prepare an artificial crack model with a crack width of w and a crack height of H, and place the artificial crack model in a core holder;
an artificial crack temporary plugging module, which is configured to prepare temporary plugging deflection fluid by selecting any temporary plugging agent, apply a confining pressure Pc to the core holder, inject the prepared temporary plugging deflection fluid into the crack with the width of w in the artificial crack model in the core holder at a certain rate, and temporarily plug the crack;
an apparent fracture toughness acquiring module, which is configured to acquire the thickness wc of a filter cake forming a temporary plugging body in the crack with the width of w, and calculate apparent fracture toughness
k
p
c
of the temporarily plugged crack through the rock fracture toughness KIC, the plane elastic modulus E′ of the core, the thickness wc of the filter cake and the confining pressure Pc;
a judging module, which is configured to acquire a fracture pressure
p
tip
c
of the temporarily plugged crack through the apparent fracture toughness
k
p
c
and the crack height H, and predict the ability of the selected temporary plugging agent to plug cracks by the fracture pressure
p
tip
c
of the temporarily plugged crack.

20 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/640,134Filed 19 Apr 2024
Priority: CN 202310422865.620 Apr 2023
Published: US 2024/0353304 A124 Oct 2024
Granted: 11 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 15/0826
Investigating permeability by forcing a fluid through a sample: and measuring fluid flow rate, i.e. permeation rate or pressure change
Y02E 10/10
Energy generation through renewable energy sources: geothermal energy
G01N
Investigating or analysing materials by determining their chemical or physical properties
Y02E
Clean energy generation and storage