High-temperature high-pressure casing cement sheath stratum sealing integrity evaluation device and method

Abstract

The invention discloses a high-temperature high-pressure casing cement sheath stratum sealing integrity evaluation device and method. The device comprises a high-temperature high-pressure kettle, a temperature and pressure control system and a combination body, wherein the high-temperature high-pressure kettle realizes alternating temperature and pressure experiment conditions of combination bodysealing integrity evaluation; the temperature and pressure control system realizes temperature and pressure regulation and control and experiment data monitoring and recording during the combination body sealing integrity evaluation period; and the combination body realizes the simulation of a full-size or compact-size casing cement sheath stratum of a high-temperature high-pressure oil and gas well target well section. Through simulating the alternating temperature, pressure and casing inner pressure work conditions of the high-temperature high-pressure oil and gas well target well section, casing / cement sheath / stratum combination body samples are designed and prepared; the blow by pressure difference among the combination body, a well cementation interface I and a well cementation interface II is tested; the internal defect appearance dimension and the compressive strength change rule are analyzed; and the stable and reliable experiment method and data support are provided for the well cementation cement sheath sealing and isolation capability detection and sealing integrity evaluation.

Description

technical field [0001] The present invention relates to the technical field of mining, in particular to a method for evaluating the integrity of casing / cement sheath / formation combination seals in the cementing process of high-temperature and high-pressure oil and gas wells, and also relates to using the method for high-temperature and high-pressure oil and gas well casing / Apparatus for evaluating cement sheath / formation seal integrity. Background technique [0002] Energy is an important material basis and power source for economic and social development. The sustainable development of the world economy has put forward higher requirements for energy demand. Cementing engineering is an important link to ensure safe and efficient oil and gas development. It is the key to protect oil and gas well casings, prolong the life of oil and gas wells, improve recovery and scientifically and rationally develop oil and gas resources. With the continuous increase in oil and gas explora...

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Problems solved by technology

[0007] (A) The curing method of casing / cement sheath / formation rock is limited, and it is impossible to finely simulate the first interface of cementing, the second interface of cementing, and the alternating high temperature, internal pressure, confining pressure and complex working conditions of oil and gas wells;

[0008] (B) The sample structure, material and experimental conditions of the casing / cement sheath / formation combination are different from the actual high temperature and high pressure oil and gas well engineering, which cannot provide reliable guarantee for the selection and applicability evaluation of the cement slurry system on site;

[0009] (C) The cementing interface between the casing and the cement sheath, the cementing interface between the cement sheath and the formation rock and the sealing ability cannot be detected at the same time, and the casing / cement sheath / formation combination cannot be truly evaluated Seal integrity of body in ultra-deep, ultra-high temperature and ultra-high pressure environment

[0010] In order to solve the problem that the conventional casing / cement sheath / formation combination seal integrity evaluation method cannot optimize the cement slurry system suitable for oil and gas well engineering, the present invention proposes a high-temperature and high-pressure oil and gas well casing / cement sheath / formation combination The design method of the simulation device, the calculation and determination of the size of the device according to the operating conditions of the oil and gas well to be evaluated, the experimental test and analysis and evaluation methods are proposed, and the device and method suitable for high temperature and high pressure casing / cement sheath / formation seal integrity evaluation have been formed

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