【摘要】：從氣相啟動(dòng)壓力梯度的物理概念和物模實(shí)驗(yàn)角度分析認(rèn)為,氣體通過高束縛水低滲致密巖心時(shí)的"閾壓效應(yīng)"實(shí)質(zhì)為氣水相間滲流阻力的宏觀反映,毛管壓力曲線與時(shí)變的氣水相滲曲線足以定量描述該現(xiàn)象,不應(yīng)引入氣相啟動(dòng)壓力梯度。建立了考慮氣水相滲時(shí)變、儲(chǔ)層應(yīng)力敏感及可動(dòng)水啟動(dòng)壓力梯度的致密氣滲流數(shù)學(xué)模型,用全隱式有限差分方法求解,并編制了數(shù)值模擬器。對新模擬器進(jìn)行了退化測試,并利用新模擬器研究了特殊滲流機(jī)理對致密氣藏開發(fā)的影響及氣水相滲時(shí)變對實(shí)際區(qū)塊的影響,結(jié)果表明:不考慮特殊滲流機(jī)理時(shí),新模擬器與Eclipse軟件計(jì)算結(jié)果具有很好的一致性;氣水相滲時(shí)變會(huì)增大氣井產(chǎn)水量、減少穩(wěn)產(chǎn)氣時(shí)間;可動(dòng)水啟動(dòng)壓力梯度會(huì)減少日產(chǎn)水量、增加穩(wěn)產(chǎn)氣時(shí)間;儲(chǔ)層應(yīng)力敏感會(huì)降低日產(chǎn)水量、提早進(jìn)入遞減期;束縛水的運(yùn)移是氣井產(chǎn)水重要原因之一,考慮氣水相滲時(shí)變更能反映實(shí)際氣井生產(chǎn)動(dòng)態(tài)。
[Abstract]:From the point of view of physical concept of gas phase starting pressure gradient and physical model experiment, it is considered that the "threshold pressure effect" of gas passing through high bound water and low permeability dense core is essentially a macroscopic reflection of the seepage resistance between gas and water phase. The capillary pressure curve and the time-varying gas-water phase permeation curve can describe the phenomenon quantitatively, and the gas-phase starting pressure gradient should not be introduced. A mathematical model of tight gas seepage with time-varying gas-water phase, sensitive reservoir stress and movable water starting pressure gradient is established. The mathematical model is solved by fully implicit finite difference method, and a numerical simulator is developed. The degradation test of the new simulator is carried out, and the influence of the special seepage mechanism on the development of the tight gas reservoir and the influence of the time-varying gas and water phase permeability on the actual block are studied by using the new simulator. The results show that the special seepage mechanism is not taken into account. The results of the new simulator are in good agreement with those of the Eclipse software. The time-varying permeability of gas-water phase will increase the water production of gas wells and reduce the time of stable gas production; the starting pressure gradient of movable water will reduce the daily water production and increase the stable gas production time; the reservoir stress sensitivity will reduce the daily water production and enter the decline period early. The migration of bound water is one of the important reasons for water production in gas wells.
【作者單位】： 中國石油大學(xué)(華東)石油工程學(xué)院;中海石油(中國)有限公司上海分公司;
【基金】：“十三五”國家科技重大專項(xiàng)“厚層非均質(zhì)性氣藏產(chǎn)能評價(jià)及預(yù)測技術(shù)(編號(hào):2016ZX05027-004-004)” 國家自然科學(xué)基金“頁巖氣藏多級(jí)壓裂水平井流動(dòng)特征及產(chǎn)能評價(jià)方法研究(編號(hào):51374227)”;國家自然科學(xué)基金“致密儲(chǔ)層體積壓裂縫網(wǎng)擴(kuò)展模擬研究(編號(hào):51574265)”部分研究成果
【分類號(hào)】：P618.13

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