氣舉反循環(huán)鉆進(jìn)中空壓機(jī)的啟動(dòng)風(fēng)壓初探
本文關(guān)鍵詞: 氣舉反循環(huán) 啟動(dòng)風(fēng)壓 巖屑舉升 氣液混合器 出處:《煤田地質(zhì)與勘探》2017年04期 論文類型:期刊論文
【摘要】:隨著氣舉反循環(huán)鉆進(jìn)技術(shù)及配套設(shè)備的不斷發(fā)展和完善,其應(yīng)用日益廣泛,用于煤礦勘探開發(fā)領(lǐng)域時(shí),確定合理的工藝參數(shù)十分關(guān)鍵。基于氣舉反循環(huán)鉆進(jìn)雙壁鉆具系統(tǒng)結(jié)構(gòu)特點(diǎn),依據(jù)牛頓第二定律求解出氣舉反循環(huán)鉆進(jìn)中巖屑被舉升排出的臨界速度模型,然后根據(jù)能量守恒定律,考慮壓縮氣體的沿程損失和局部阻力損失,建立了氣舉反循環(huán)鉆進(jìn)的啟動(dòng)風(fēng)壓模型。用Matlab對(duì)模型進(jìn)行計(jì)算,分析發(fā)現(xiàn)井深、氣液混合器的下入深度、沉沒(méi)比和鉆井液密度都對(duì)啟動(dòng)風(fēng)壓有影響。計(jì)算結(jié)果為確定合理的啟動(dòng)風(fēng)壓奠定了基礎(chǔ),為空壓機(jī)的合理選配提供了依據(jù),對(duì)保證良好的鉆進(jìn)效果具有重要意義。
[Abstract]:With the continuous development and improvement of gas lift reverse circulation drilling technology and related equipment, its application is becoming more and more extensive, when it is used in the field of coal mine exploration and development, It is very important to determine reasonable technological parameters. Based on the structural characteristics of double wall drilling tool system in reverse circulation drilling with gas lift, the critical velocity model of cuttings lifting and discharging in reverse circulation drilling with gas lift is solved according to Newton's second law. Then according to the law of conservation of energy, considering the loss of compressed gas along the path and local resistance, the starting wind pressure model of gas lift reverse circulation drilling is established. The model is calculated with Matlab, and the depth of well depth and the bottom entry depth of gas-liquid mixer are found out. Both the sinking ratio and drilling fluid density have an effect on the starting wind pressure. The calculation results lay a foundation for determining the reasonable starting air pressure, and provide the basis for the reasonable selection of air compressor, which is of great significance to ensure the good drilling effect.
【作者單位】: 煤炭科學(xué)研究總院;中煤科工集團(tuán)西安研究院有限公司;
【基金】:國(guó)家科技重大專項(xiàng)課題(2016ZX05045-003)~~
【分類號(hào)】:P634.5
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