本文選題：負(fù)壓脈沖射流 + 噴嘴��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：井底負(fù)壓脈沖的多個(gè)參數(shù)對(duì)鉆頭的鉆進(jìn)有著不同程度的影響,本文著重研究這些參數(shù)對(duì)鉆頭鉆進(jìn)的影響效果,為改進(jìn)鉆井工藝提供參考。根據(jù)射流通道和內(nèi)部流體的特點(diǎn),以不穩(wěn)定熱傳導(dǎo)關(guān)系方程為研究基礎(chǔ),使用計(jì)算機(jī)語言Matlab進(jìn)行模擬運(yùn)算,模擬運(yùn)算出鉆頭鉆進(jìn)不同地層過程中包裹巖層與負(fù)壓脈沖傳播特點(diǎn)間的影響關(guān)系。設(shè)定鉆井負(fù)壓延續(xù)時(shí)間為一個(gè)毫秒,研究表明在此范圍內(nèi),脈沖三角波在井下持續(xù)的負(fù)壓值比脈沖方形波持續(xù)的同類值要小,這一關(guān)系說明脈沖方形波能夠促進(jìn)鉆井的效率,基于此關(guān)系對(duì)各區(qū)間的參數(shù)值進(jìn)行篩選,波動(dòng)頻率區(qū)間為55~105Hz,持續(xù)時(shí)間區(qū)間為1.5~2.5ms的脈沖波有較好的進(jìn)尺效果。采用改變調(diào)制器外面通道形態(tài)和噴嘴通道形態(tài),選取恒定的噴嘴出口直徑設(shè)計(jì)實(shí)驗(yàn),深入研究對(duì)鉆井效果的影響。實(shí)驗(yàn)結(jié)果顯示:隨著錐形噴嘴縮口的增大,負(fù)壓脈沖值的損失增加;隨著梯形噴嘴進(jìn)出端口直徑比值的增加,負(fù)壓脈沖值損失減小。在上述研究的基礎(chǔ)上,進(jìn)行負(fù)壓脈沖射流輔助鉆井實(shí)驗(yàn)?zāi)M。實(shí)驗(yàn)?zāi)M結(jié)果顯示:負(fù)壓脈沖輔助鉆井速度隨著井底圍壓的升高先升后降;隨著脈沖負(fù)壓值的增加而增大;這些影響都可以大幅度的提升鉆井效率,其技術(shù)應(yīng)用前景不可估量。
[Abstract]:Several parameters of bottom hole negative pressure pulse have different effects on bit drilling. This paper focuses on the effect of these parameters on bit drilling, which provides a reference for improving drilling technology. According to the characteristics of the jet channel and internal fluid, based on the unstable heat conduction equation, the computer language Matlab is used to carry out the simulation operation. The relationship between the characteristics of negative pressure pulse propagation and the surrounding rock formation during bit drilling in different formations is simulated and calculated. The negative pressure duration of drilling is set as one millisecond. The research shows that in this range, the negative pressure of the pulse triangle wave is smaller than the same value of the pulse square wave. This relationship shows that the pulse square wave can promote the drilling efficiency. Based on this relation, the parameter values of each interval are screened. The pulse wave with a wave frequency interval of 55 ~ 105Hz and a duration interval of 1.5~2.5ms has a good scaling effect. By changing the outside channel shape and nozzle channel shape of modulator and selecting constant nozzle outlet diameter design experiment, the effect on drilling effect is deeply studied. The experimental results show that the loss of negative pressure pulse increases with the increase of conical nozzle shrinkage, and decreases with the increase of the ratio of inlet and outlet diameter of trapezoidal nozzle. On the basis of the above research, the experimental simulation of negative pressure pulse jet assisted drilling is carried out. The experimental results show that the velocity of negative pressure pulse assisted drilling rises first and then decreases with the increase of bottom hole confining pressure, and increases with the increase of pulse negative pressure. These effects can greatly improve the drilling efficiency, and the technical application prospect is inestimable.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE242
，

本文編號(hào)：1996424