本文選題：帶油環(huán)凝析氣藏 + 潛力分析　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：K7氣藏為邊水帶油環(huán)凝析氣藏,1977年井噴發(fā)現(xiàn)后,于1980年9月正式投產(chǎn),目前處于產(chǎn)量遞減階段。該氣藏由于早期井噴,導(dǎo)致地層壓力下降,天然能量不足,開采初期地層中就有凝析油析出,后續(xù)衰竭式開采過程中凝析污染嚴(yán)重,凝析油采出程度低。同時(shí)由于氣頂壓力下降,部分邊部氣井出現(xiàn)油環(huán)突破現(xiàn)象。為了更加清楚地認(rèn)識(shí)該氣藏剩余儲(chǔ)量分布情況,本文從生產(chǎn)動(dòng)態(tài)資料和測(cè)試資料入手,分析單井剩余潛力及潛力層位,提出增產(chǎn)措施并進(jìn)行可行性及機(jī)理分析研究；結(jié)合氣藏地質(zhì)特征,建立儲(chǔ)層地質(zhì)模型,利用數(shù)值模擬研究剩余儲(chǔ)量分布,提出氣藏開發(fā)調(diào)整方案,指導(dǎo)氣藏合理開發(fā)。本次研究主要取得如下認(rèn)識(shí)： (1)K7氣藏儲(chǔ)層基質(zhì)物性較好,斷層發(fā)育但隔擋作用差,水體不活躍。利用氣藏地質(zhì)資料建立了精細(xì)地質(zhì)模型。 (2)對(duì)該氣藏躺井、氣井、邊部油井進(jìn)行了生產(chǎn)動(dòng)態(tài)分析,根據(jù)油氣井的生產(chǎn)歷史數(shù)據(jù)計(jì)算了主要生產(chǎn)井天然氣、凝析油的單井動(dòng)態(tài)儲(chǔ)量以及油井的油環(huán)、溶解氣的單井動(dòng)態(tài)儲(chǔ)量。同時(shí)將單井采出油氣劈分到各小層,得到各小層剩余潛力,并根據(jù)試油結(jié)果,對(duì)有潛力的井提出生產(chǎn)調(diào)整措施。 (3)氣層單井動(dòng)態(tài)地質(zhì)儲(chǔ)量分布不均勻,氣頂氣的主要潛力在K7-2、K7-3和K7-7小層。油環(huán)上的井少,單井油環(huán)油動(dòng)態(tài)地質(zhì)儲(chǔ)量采出程度不均勻,平均油環(huán)油動(dòng)態(tài)儲(chǔ)量的采出程度25%,油環(huán)潛力較大。因此應(yīng)該保持能量盡量多的開采油環(huán),以提高油環(huán)采出程度。 (4)根據(jù)生產(chǎn)動(dòng)態(tài)分析結(jié)果,提出循環(huán)注氣提高凝析油采收率方法,并做機(jī)理研究,優(yōu)選注采參數(shù),針對(duì)本氣藏這種中后期循環(huán)注氣的氣藏提出先高注采比后注氣保壓的循環(huán)注氣方式,在相同注入氣量情況下,此方法能獲得更好的經(jīng)濟(jì)效益。 (5)數(shù)值模擬研究表明,剩余氣主要分布在構(gòu)造高部和構(gòu)造西部,剩余油主要分布在構(gòu)造南部,這些地方應(yīng)作為挖潛的主要區(qū)域。 (6)根據(jù)動(dòng)態(tài)分析單井潛力層位及數(shù)值模擬剩余油氣分布,綜合提出了單井生產(chǎn)制度調(diào)整、循環(huán)注氣及打新井的開發(fā)調(diào)整方案,通過經(jīng)濟(jì)評(píng)價(jià)優(yōu)選出了一套最優(yōu)方案。
[Abstract]:K7 gas reservoir is a side water belt oil ring condensate gas reservoir. After the blowout was discovered in 1977, it was put into production in September 1980, and it is in the stage of production decline at present.Due to the early blowout, the formation pressure is decreased and the natural energy is insufficient. Condensate oil is precipitated in the early stage of exploitation, and the condensate pollution is serious and the recovery degree of condensate oil is low.At the same time, due to the decrease of gas cap pressure, oil ring breakthrough appears in some side gas wells.In order to understand the distribution of the remaining reserves of the gas reservoir more clearly, this paper starts with the production performance data and test data, analyzes the residual potential and potential horizon of single well, puts forward the measures of increasing production, and analyzes the feasibility and mechanism.Combined with the geological characteristics of the gas reservoir, the geological model of the reservoir is established, the distribution of remaining reserves is studied by numerical simulation, and the plan of gas reservoir development adjustment is put forward to guide the rational development of the gas reservoir.The main findings of this study are as follows:The reservoir matrix physical property of the gas reservoir is good, fault is developed, but the barrier is poor, and the water is not active.A fine geological model is established based on gas reservoir geological data.(2) the production performance of lying well, gas well and side oil well in this gas reservoir is analyzed. According to the production history data of oil and gas well, the dynamic reserves of natural gas, single well of condensate oil and the oil ring of oil well are calculated.Single well dynamic reserves of dissolved gas.At the same time, the oil and gas produced from single well are divided into each sublayer, and the residual potential of each sublayer is obtained. According to the result of oil test, the production adjustment measures for the potential well are put forward.The main potential of gas cap gas is in K7-2K7-3 and K7-7 sublayers.There are few wells on the oil ring, the recovery degree of the oil ring dynamic reserves is uneven, the recovery degree of the average oil ring dynamic reserves is 25, and the oil ring potential is great.Therefore, the energy should be kept as much as possible to improve the recovery of oil rings.4) according to the results of dynamic analysis of production, the method of improving condensate recovery by circulating gas injection is put forward, and the mechanism is studied to optimize the injection and production parameters.Aiming at this gas reservoir, a new way of gas injection with high injection / production ratio and then gas injection to maintain pressure is put forward. Under the condition of the same gas injection rate, this method can obtain better economic benefits.The numerical simulation results show that the residual gas is mainly distributed in the high part of the structure and the western part of the structure, and the remaining oil is mainly distributed in the southern part of the structure, which should be regarded as the main area of tapping potential.Based on the dynamic analysis of single well potential horizon and numerical simulation of remaining oil and gas distribution, the development adjustment scheme of single well production regulation, circulating gas injection and drilling new well is put forward, and a set of optimal scheme is selected through economic evaluation.
【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】：2015
【分類號(hào)】：TE372

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