Sealing integrity evaluation device for high-temperature and high- pressure casing-cement ring-formation and method thereof

Patent metadata

Field	Value
Publication number	US-11733121-B2
Application number	US-202117229802-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Aug 26, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A sealing integrity evaluation device for high-temperature and high-pressure casing-cement ring-formation and a method thereof are provided. the device includes: a high-temperature autoclave, a temperature and pressure control system, and a casing-cement-formation combination; wherein the autoclave realizes alternating temperature and pressure during the experiment; the control system monitors, controls and records the temperature and pressure data; the combination simulates a full size or a compact size casing-cement-formation of a well. Casing-cement-formation combination samples are designed and prepared by simulating working conditions such as alternating temperature, pressure, and casing internal pressure, by testing the channeling and leakage pressure of the first interface and the second interface of combination, analyzing the shape and size of the internal defects, testing the compressive strength, provided a more stable and reliable experimental method and data support for the detection of cementing sheath sealing ability and the evaluation of sealing integrity.

First claim

What is claimed is:

1. A sealing integrity evaluation device for casing cement ring formation, comprising: an autoclave, a temperature and pressure control system, and a three-layer cylinder ( 12 ); wherein
the autoclave comprises: a kettle cover ( 1 ), a kettle body ( 2 ), an air inlet check valve ( 7 ), an air inlet pipeline ( 8 ), an air outlet pipeline ( 9 ), a bracket ( 11 ), and an exhaust valve ( 13 ), thereby realizing alternating temperature and pressure conditions for sealing integrity evaluation of a casing/cement ring/formation combination;
the temperature and pressure control system comprises: a heating jacket ( 3 ), an insulation layer ( 4 ), a temperature and pressure probe ( 5 ), a temperature and pressure monitoring system ( 10 ), and a booster pump ( 6 ), thereby controlling temperatures and pressures as well as monitoring and recording data during the sealing integrity evaluation of the casing/cement ring/formation combination;
the kettle cover ( 1 ) and the kettle body ( 2 ) together form a closed system through sealing; the air inlet pipeline ( 8 ) and the air outlet pipeline ( 9 ) are both connected to the closed system; the booster pump ( 6 ) is connected to the air inlet pipeline ( 8 ), and the air inlet check valve ( 7 ) is installed on the air inlet pipeline ( 8 ) to control air intake; the exhaust valve ( 13 ) is installed on the air outlet pipeline ( 9 ) to control exhaust; the bracket ( 11 ) is installed in the closed system to support the three-layer cylinder ( 12 );
a surface of the kettle body ( 2 ) is covered by the heating jacket ( 3 ), and the heating jacket ( 3 ) is covered by the insulation layer ( 4 ); the temperature and pressure probe ( 5 ) penetrates the heating jacket ( 3 ), the insulation layer ( 4 ) and the kettle body ( 2 );
the three-layer cylinder ( 12 ) comprises: formation rock ( 14 ), the cement ring ( 15 ), the casing ( 16 ), a combination upper cover plate ( 17 ), a combination lower cover plate ( 18 ), a combination sealing ring ( 19 ), a casing sealing ring ( 20 ), combination upper cover handles ( 21 ), combination upper cover plugs ( 22 ), channel inspection pipelines ( 23 ), a channel inspection manifold ( 24 ), a casing valve ( 25 ), combination lower cover plugs ( 26 ), a casing cavity ( 27 ), combination lower cover handles ( 28 ), a straight joint ( 29 ), and steel wires;
the ( 12 ) three-layer cylinder, from inside to outside, comprises the casing ( 16 ), the cement ring ( 15 ), and formation rock ( 14 ); the combination upper cover plate ( 17 ) is installed on an upper surface of the three-layer cylinder, and the combination lower cover plate ( 18 ) is installed on a lower surface of the three-layer cylinder; a first cementing interface is formed between the casing ( 16 ) and the cement ring ( 15 ), and a second cementing interface is formed between the cement ring ( 15 ) and the formation rock ( 14 );
two combination upper cover handles ( 21 ) are symmetrically provided on the combination upper cover plate ( 17 ), and six combination upper cover plugs ( 22 ) are provided on a top portion of the combination upper cover plate ( 17 ); each of the combination upper cover plate plugs ( 2 ) is inserted with one of the channeling inspection pipelines ( 23 ); one ends of all the channel inspection pipelines ( 23 ) pass through the combination upper cover plugs ( 22 ) and the combination upper cover plate ( 17 ) and then enter the cement ring ( 15 ); the other ends of all the channel inspection pipelines ( 23 ) are converged to the channel inspection manifold ( 24 ) through the straight joint ( 29 ); one end of the straight joint ( 29 ) is connected to the channel inspection pipelines ( 23 ), and the other end of the straight joint ( 29 ) is connected to the channel inspection manifold ( 24 );
an upper portion of the three-layer cylinder is sealed by the combination sealing ring ( 19 ), the combination upper cover plugs ( 22 ) and the casing sealing ring ( 20 ), and the channel inspection manifold ( 24 ) applies a channel inspection pressure to the cement ring ( 15 ); two combination lower cover handles ( 28 ) are symmetrically provided on the combination lower cover plate ( 18 ), and six combination lower cover plugs ( 26 ) and the casing valve ( 25 ) are provided on a surface of the combination lower cover plate ( 18 ); a lower portion of the three-layer cylinder is sealed by the combination sealing ring ( 19 ), the combination lower cover plugs ( 26 ) and the casing sealing ring ( 20 ), and is connected to a casing valve pipeline through the casing valve ( 25 ); the casing valve pipeline passes through the combination lower cover plate ( 18 ) and penetrates into the three-layer cylinder, thereby increasing or decreasing an internal pressure of the casing cavity ( 27 ); and
the combination upper cover plugs ( 22 ) are connected to and sealed with the combination upper cover plate ( 17 ) by threads, and the combination lower cover plugs ( 26 ) are connected to and sealed with the combination lower cover plate ( 18 ) by threads, too; the combination upper cover handles ( 21 ) and the combination lower cover handles ( 28 ) are connected to the combination upper cover ( 17 ) and the combination lower cover ( 26 ) respectively through threads.

2. The sealing integrity evaluation device, as recited in claim 1 , wherein the one ends of the six channel inspection pipelines ( 23 ) are vertically inserted into the cement ring, and are bent to the first cementing interface or the second cementing interface; a diameter of the channel inspection pipelines ( 23 ) is 3 mm, and a diameter of the steel wires inserted in the channel inspection pipelines ( 23 ) is 1 mm; one ends of the steel wires are fixed in the cement ring ( 15 ), and the other ends of the steel wires are fixed on the combination upper cover plate ( 17 ) through the combination upper cover plugs ( 22 ) and are then converged to the channel inspection manifold ( 24 ) through the straight joint ( 29 ); the steel wires are pulled out from the channel inspection pipelines ( 23 ) during channel inspection.

3. The sealing integrity evaluation device, as recited in claim 2 , wherein the formation rock ( 14 ) is natural formation rock collected according to a wellbore size of a target well section of the oil and gas well.

4. The sealing integrity evaluation device, as recited in claim 3 , wherein the kettle cover ( 1 ), the kettle body ( 2 ), the air inlet check valve ( 7 ), the air inlet pipeline ( 8 ), the air outlet pipeline ( 9 ) and the exhaust valve ( 13 ) are all made of Hastelloy C276;
the cement ring ( 15 ) is formed by solidifying a cement slurry used in the target well section of the oil and gas well;
a material of the casing ( 16 ) is identical to a casing material used in the target well section of the oil and gas well;
materials of the combination upper cover plate ( 17 ), the combination lower cover plate ( 18 ), the combination upper cover handles ( 21 ), the combination upper cover plugs ( 22 ), and the combination lower cover plugs ( 26 ) are identical to the material of the casing ( 16 );
the combination seal ring ( 19 ) and casing seal ring ( 20 ) are made of polytetrafluoroethylene; and
the channel inspection pipelines ( 23 ), the channel inspection manifold ( 24 ), and the steel wires are made of the Hastelloy C276.

Assignees

• Univ Southwest Petroleum
• Engineering Tech Research Institute Southwest Oil And Gas Field Company Of Petro China
• Engineering Tech Research Institute Southwest Oil And Gas Fieldcompany Of Petro China

Inventors

• Zhang Zhi
• Hou duo
• Zhang Huali
• Li Yufei
• Wu You
• Zhang Lin
• Luo Wei
• Wang Chuanlei
• Zhong Xiankang
• Sang Pengfei

Classifications

• G01M3/26 Primary

  by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors · CPC title

• G01M3/06

  by observing bubbles in a liquid pool · CPC title

• G01N21/95

  characterised by the material or shape of the object to be examined (G01N21/89 - G01N21/91, G01N21/94 take precedence) · CPC title

• G01N23/046

  using tomography, e.g. computed tomography [CT] · CPC title

• G01N23/06

  and measuring the absorption · CPC title