本文選題：致密油 + 體積壓裂��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：作為一種重要的能源供給形式,近年來,致密油氣的勘探和開發(fā)在國內(nèi)外已經(jīng)成為熱點領(lǐng)域之一。三塘湖油田馬56區(qū)塊屬于典型的致密油藏,壓裂改造是開發(fā)致密油藏最有效的技術(shù)手段。因此,通過對該油田體積壓裂改造工藝技術(shù)開展研究,對于提高區(qū)塊致密油藏開發(fā)效果以及推動致密油藏壓裂增產(chǎn)技術(shù)上臺階具有十分重要的作用和意義。本文在總結(jié)國內(nèi)外致密油儲集層體積壓裂改造已有成果的基礎(chǔ)上,進行地質(zhì)工程一體化研究,從儲層的角度開展了儲集層脆性特征、天然裂縫、儲集層應(yīng)力條件等方面的評價,明確了儲層具備體積壓裂的條件。系統(tǒng)評價了儲層原始潤濕性、壓裂液對儲層潤濕性以及潤濕性對水驅(qū)油采收率的影響,結(jié)果表明,研究區(qū)致密油儲層潤濕性現(xiàn)為弱水濕—親水特征,平均相對潤濕指數(shù)0.37。壓裂液作用于儲層后,儲層傾向于水潤濕性特征,儲層親水性增強。不同潤濕性巖心水驅(qū)油實驗結(jié)果表明,水潤濕性越強,水—巖石作用力越強,水驅(qū)突破晚,水驅(qū)置換原油效果越好。以單井產(chǎn)量為目標(biāo),對水平井井眼方位以及完井方式進行了優(yōu)化,并設(shè)計了3種不同的井網(wǎng)形式,通過數(shù)值模擬,確定了區(qū)塊水平井矩形五點法井網(wǎng)布井方式,優(yōu)化水平段長度為600~800m之間,排距為400m。對水平井分級多簇體積壓裂布縫機理進行了研究,優(yōu)化形成了目標(biāo)區(qū)塊縫間距和射孔數(shù),采用軟件數(shù)值模擬技術(shù),對壓裂主要工藝參數(shù)進行了優(yōu)化,確定了目標(biāo)區(qū)塊裂縫半長、加砂量、導(dǎo)流能力以及施工排量等關(guān)鍵工藝參數(shù)。對影響壓裂改造效果的關(guān)鍵因素進行了總結(jié),水平段長度、壓裂改造規(guī)模和分段距離是影響壓裂改造效果最主要的因素。水平段長度與壓裂效果呈正相關(guān)關(guān)系,水平井段越長,單井壓后日產(chǎn)液、日產(chǎn)油和180天后累計產(chǎn)液、累計產(chǎn)油量均呈增長趨勢;單井壓裂改造規(guī)模越大,生產(chǎn)180天后的累計產(chǎn)液量和累計產(chǎn)油量也呈增加的趨勢,同時單井自噴生產(chǎn)周期和自噴生產(chǎn)量也不斷增加;段間距離在80~100m之間時平均單段累計產(chǎn)液量和產(chǎn)油量最高。
[Abstract]:As an important form of energy supply, the exploration and development of dense oil and gas has become one of the hot fields at home and abroad in recent years. Block Ma56 of Santanghu Oilfield is a typical compact reservoir, and fracturing is the most effective technical means to develop compact reservoir. Therefore, it is very important and significant to improve the development effect of tight reservoir in block and to promote fracturing and increasing production technology of tight reservoir by studying the technology of volume fracturing reconstruction in this oilfield. On the basis of summing up the existing achievements in volume fracturing of dense oil reservoirs at home and abroad, this paper studies the integration of geological engineering, and carries out the evaluation of reservoir brittleness, natural fractures, reservoir stress conditions and so on from the perspective of reservoir. It is clear that the reservoir has the condition of volume fracturing. The original wettability of reservoir, the effect of fracturing fluid on reservoir wettability and the effect of wettability on water drive oil recovery are systematically evaluated. The results show that the wettability of dense oil reservoir in the studied area is weak wet-hydrophilic, and the average relative wettability index is 0.37. When the fracturing fluid acts on the reservoir, the reservoir tends to wettability and the hydrophilicity of the reservoir is enhanced. The experimental results of water flooding in different wettable cores show that the stronger the wettability, the stronger the water-rock force, the later the water flooding breakthrough, the better the water displacement effect. Taking single well production as the target, the hole orientation and completion mode of horizontal well are optimized, and three different well pattern forms are designed. Through numerical simulation, the rectangular five-spot well pattern distribution mode of horizontal well in block is determined. The length of the optimized horizontal segment is between 600m and 800m, and the spacing is 400m. In this paper, the fracturing mechanism of graded multi-cluster volume fracturing in horizontal wells is studied, and the fracture spacing and perforation number of target blocks are optimized. The main parameters of fracturing are optimized by using software numerical simulation technology, and the half length of fracture in target block is determined. Key process parameters, such as sand addition, diversion capacity and construction displacement. The key factors affecting the effect of fracturing are summarized. The length of horizontal section, the scale of fracturing and the distance of fracturing are the most important factors affecting the effect of fracturing. The length of horizontal section is positively correlated with the fracturing effect. The longer the horizontal well is, the greater the daily fluid production, the daily oil production and the accumulative fluid production after 180 days are, and the larger the scale of single well fracturing is. After 180 days of production, the accumulative liquid production and cumulative oil production also showed an increasing trend, at the same time, the production cycle and self-jet production of a single well were also increasing, and the average accumulative liquid production and oil production of a single section were the highest when the distance between sections was between 80 ~ 100m.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357

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本文編號：1917434