C9低滲透油藏注空氣開發(fā)可行性研究
本文關(guān)鍵詞:C9低滲透油藏注空氣開發(fā)可行性研究 出處:《西南石油大學(xué)》2017年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 低滲透 輕質(zhì)油藏 注空氣 數(shù)值模擬
【摘要】:C9井區(qū)西山窯組油藏滲透率平均為10mD,屬于低滲透油藏,該區(qū)微裂縫發(fā)育。自從1993年開始進(jìn)行注水,經(jīng)過(guò)20多年的開發(fā),油田經(jīng)歷了產(chǎn)能建設(shè)階段、高產(chǎn)穩(wěn)產(chǎn)階段、快速遞減階段、加密調(diào)整階段和綜合治理階段。目前油田暴露出許多問(wèn)題:油田注采井之間沒(méi)能形成有效的驅(qū)替系統(tǒng),注不進(jìn)采不出矛盾突出,導(dǎo)致壓力場(chǎng)分布不均。為緩解注采矛盾該區(qū)進(jìn)行了小井距加密試驗(yàn),由于油井壓裂溝通次生底水導(dǎo)致采油井高含水,小井距開發(fā)效果不佳,開發(fā)形勢(shì)嚴(yán)峻。首先,針對(duì)上述問(wèn)題,進(jìn)行了注空氣驅(qū)可行性分析。從油藏流體條件與注空氣篩選標(biāo)準(zhǔn)的匹配度,隔層條件防止層間氣竄的適應(yīng)性,地層構(gòu)造傾角的適應(yīng)性,巖礦組成對(duì)低溫氧化反應(yīng)的影響等方面進(jìn)行分析,認(rèn)為該區(qū)域均符合注空氣開發(fā)的有利條件。其次,數(shù)值模擬預(yù)測(cè)挖潛潛力。根據(jù)前人對(duì)該區(qū)域的微裂縫預(yù)測(cè),建立帶有裂縫系統(tǒng)的雙重介質(zhì)地質(zhì)模型和數(shù)值模型,結(jié)合生產(chǎn)動(dòng)態(tài)數(shù)據(jù),利用示蹤劑資料,根據(jù)不同層的見(jiàn)劑方向調(diào)整小層油水井間的滲透率,對(duì)單井及全區(qū)的含水、產(chǎn)油量等指標(biāo)進(jìn)行擬合,得到符合真實(shí)地層的地質(zhì)模型。通過(guò)數(shù)值模擬計(jì)算得到各小層的剩余可采儲(chǔ)量及剩余油分布。剩余油分布表明J2X12-2、J2X13-1的含油飽和度較高,J2x13-2、J2X14層水淹程度較高,預(yù)測(cè)剩余可采儲(chǔ)量21.6×104t,具有進(jìn)一步挖潛的潛力。最后,建立空氣驅(qū)數(shù)值模型,對(duì)注氣參數(shù)進(jìn)行優(yōu)化。數(shù)值模擬結(jié)果表明:注空氣開發(fā)明顯優(yōu)于注水開發(fā);由于構(gòu)造傾角較小,高低部位注氣對(duì)后期累產(chǎn)量有影響;水氣交替周期長(zhǎng)短對(duì)產(chǎn)油量的影響不大;通過(guò)對(duì)注氣量的優(yōu)選,單井注氣量在22000m3/d時(shí)換油率最高,建議單井注氣量在22000m3/d左右最佳;空氣中氧含量越高,累產(chǎn)油量越大,為了兼顧安全生產(chǎn),同時(shí)獲得最大累產(chǎn)油量,考慮減氧至10%進(jìn)行生產(chǎn)。同時(shí),經(jīng)濟(jì)評(píng)價(jià)表明選擇單井注氣量在22000m3/d開發(fā)時(shí),區(qū)塊在第二年即可收回成本,空氣驅(qū)開發(fā)可以獲得較大利潤(rùn)。
[Abstract]:C9 well area of Xishanyao reservoir average permeability is 10mD, which belongs to low permeability reservoir, the micro crack growth. Since the beginning of 1993 water, after 20 years of development, has experienced the oil production capacity construction stage, production stage, rapid decline stage, encryption adjustment stage and comprehensive treatment stage. At present oil exposed many problems between the oil well can not form effective system for flooding, injection production no contradiction, resulting in pressure field distribution. In order to alleviate the contradiction between the injection production well spacing test area of encryption, because communication leads to fracturing secondary bottom water high water cut wells, well spacing development effect is poor, development the situation is grim. Firstly, aiming at the above problems, this paper presents a feasibility analysis of flooding from the air. The matching degree of reservoir fluid conditions and air injection screening criteria, the interlayer conditions to prevent gas channeling layer formation adaptability. Make angle of adaptability, the mineral composition of low temperature oxidation were analyzed in this region are in line with the favorable conditions of air injection development. Secondly, the numerical simulation. According to the previous prediction of tapping the potential of micro cracks in the region, the establishment of dual medium geological model and numerical model with fracture system, combined with the production dynamic data, using the tracer data, according to the different layer see direction adjustment layer agent between oil and water well permeability, water content of single well and the index, oil production by fitting with the geological model of the real formation. Through the numerical simulation of residual layer of the small recoverable reserves and remaining oil distribution are calculated. J2X12-2 showed that the distribution of remaining oil, J2X13-1 J2x13-2, J2X14 high oil saturation, watered out degree of prediction of remaining recoverable reserves of 21.6 * 104t, with further tapping potential finally. The establishment of air, flooding numerical model of gas injection parameters were optimized. The numerical simulation results show that the air injection development is obviously better than that of water flooding; because the construction of a small dip, or parts of gas injection on the late tired yield effect; influence of water alternating cycle oil production is not large; by optimization of gas injection rate, single well gas injection in 22000m3/d oil was the highest, that of single well gas injection best at about 22000m3/d; the higher the oxygen content in the air, the greater the amount of cumulative production, in order to take into account the safety in production, and get the maximum cumulative production to 10%, considering the reduced oxygen production. At the same time, the economic evaluation shows that the choice of single well gas injection in 22000m3/d the development, in second years to recover the cost of the block, air flooding can obtain greater profits.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TE357.7
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