【摘要】：振動(dòng)固井可有效提高頂替效率和一、二界面的膠結(jié)強(qiáng)度。本文主要對(duì)水力它激振蕩機(jī)理及其振動(dòng)固井機(jī)理進(jìn)行研究,以水力它激振蕩振動(dòng)固井工具腔室出口脈沖壓力增加值為研究對(duì)象,對(duì)其腔室以及環(huán)空等空間內(nèi)流體流動(dòng)情況進(jìn)行正交數(shù)值模擬,分析腔室結(jié)構(gòu)和流體介質(zhì)特性參數(shù)對(duì)腔室出口脈沖壓力增加值大小的影響情況。研究成果如下： (1)水力它激振蕩振動(dòng)固井工具可使固井時(shí)套管底部出口的瞬時(shí)速度和壓力大幅度提高,產(chǎn)生脈沖壓力作用于環(huán)空流體,提高注水泥頂替效率。 (2)該振動(dòng)固井工具產(chǎn)生的脈沖壓力,從井底沿環(huán)空向上傳播過程中,隨距井底距離的增加而減��；脈沖壓力最遠(yuǎn)傳播距離與井底初始脈沖壓力成正比。 (3)對(duì)該振動(dòng)固井工具腔室內(nèi)流體流動(dòng)狀態(tài)的數(shù)值模擬研究表明,均勻來流經(jīng)過該它激振蕩腔室后會(huì)發(fā)生強(qiáng)烈的振蕩,形成振幅為0.7MPa的脈沖壓力。 (4)影響該振動(dòng)固井工具脈沖壓力增加量的主要因素是上下口直徑比值r和上口排量Q。當(dāng)r=1.5時(shí),脈沖壓力增加量最大；隨著上口排量Q的增大,脈沖壓力明顯增加,而其增加量的百分比卻變化不大。 (5)在對(duì)該固井工具固井效果影響因素研究與分析的基礎(chǔ)上,優(yōu)化設(shè)計(jì)水力它激振蕩振動(dòng)固井工具的結(jié)構(gòu)參數(shù)。 通過理論分析和數(shù)值模擬研究表明,本文設(shè)計(jì)的水力它激振蕩振動(dòng)固井工具能有效提高固井質(zhì)量。
[Abstract]:Vibration cementing can effectively improve the replacement efficiency and the bonding strength of one and two interfaces. In this paper, the mechanism of hydraulic vibration and its vibration cementing mechanism are studied, and the added value of pulse pressure at the outlet of hydraulic vibration cementing tool chamber is taken as the research object. The orthogonal numerical simulation of fluid flow in chamber and annular space is carried out, and the influence of chamber structure and fluid medium characteristic parameters on the increase of pulse pressure at the outlet of chamber is analyzed. The research results are as follows: (1) hydraulic vibration cementing tool can greatly increase the instantaneous velocity and pressure at the bottom outlet of casing, produce pulse pressure acting on annular fluid, and improve the replacement efficiency of cement injection. (2) during the upward propagation of pulse pressure from the bottom hole along the annulus, the pulse pressure decreases with the increase of the distance from the bottom hole, and the furthest propagation distance of the pulse pressure is proportional to the initial pulse pressure at the bottom of the well. (3) the numerical simulation of the fluid flow state in the vibrating cementing tool cavity shows that the uniform incoming flow will oscillate strongly after passing through the vibrating cavity, and the pulse pressure with amplitude of 0.7MPa will be formed. (4) the main factors affecting the pulse pressure increase of the vibrating cementing tool are the ratio of upper and lower orifice diameter r and the upper mouth discharge Q. When r 鈮，

本文編號(hào)：2486913