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Experiment Study on the Law of Change of Casing Axial Tension in Process of Well Cementation

Author: MengXianPeng
Tutor: LiZiFeng
School: Yanshan University
Course: Oil and Gas Well Engineering
Keywords: Cementing Grout Weightlessness Casing Stress Analysis
CLC: TE256.9
Type: Master's thesis
Year: 2010
Downloads: 103
Quote: 1
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Abstract


The grout curing process is an important part of cementing engineering , the grout curing a direct impact on the pros and cons of the cementing quality , which in turn affect the entire drilling engineering and cost issues . Grout curing process , reduce the pressure of slurry column will increase the upper casing of the Rally , which is the main cause of oil , gas , water channeling and casing of the early damage . The grout gelled process , due to hydration to produce a warming phenomenon , and subsequently weightlessness , under the combined action of the temperature and pressure causes the casing string great deformation occurs . With the cement curing , this deformation will be consolidation in the segment of cemented as the injection and production under the conditions of temperature, pressure changes , cementing casing segment may be in serious stress and strain , and there may be an important factor of the impact sleeve life . Casing damage process , only for cementing finished cement paste after consolidation , oilfield production late , due to the high temperature and pressure of the strata , construction and other factors , the attention is mainly concentrated in the mechanical and chemical role in two aspects, with little consideration of the change in the state of the gelation process of the cement slurry in the casing . Therefore study of the casing string in the the grout gelling weightlessness process in the force and the deformation law is necessary. Of this thesis by means of laboratory experiments designed experimental device casing load test grout curing process , the simulated downhole different conditions ; under the influence of factors such as the density of the grout , cement sheath length , admixtures and formation environment sets tube by the force and changes ; derived the casing axial tension with grout clotting time presents step-like increments and finally tends to decrease . The experimental study concluded slurry system and formulation preferred to improve the construction process of cementing and casing late damage to provide a reference .

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CLC: > Industrial Technology > Oil and gas industry > Drilling engineering > Wash wells, cementing,completion,reservoir damage and prevention > Cementing engineering > Other
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