本文選題：特低滲透油田 + 超前注水��； 參考：《東北石油大學》2017年碩士論文

【摘要】：朝陽溝油田是典型的低-特低滲透裂縫性油藏,儲層滲流阻力大,壓力傳導能力差,具有一定的壓敏特性,投產(chǎn)后油井遞減速度快,注水受效慢。目前探明未動用的儲量以及待提交儲量,主要以低、特低滲透欠壓油藏為主,進一步加大了油田開發(fā)的難度。超前注水開發(fā)方式能合理補充地層能量,提高地層壓力,防止儲層滲透率損失,建立有效的驅(qū)動體系,從而提高油井生產(chǎn)能力并減小遞減速度,是一種有效的低滲透油田開發(fā)方法,對朝陽溝油田提高水驅(qū)開發(fā)效果具有重要意義。為此,對超前注水提高產(chǎn)油量機理、超前注水技術(shù)界限及后期調(diào)整對策,做了進一步的研究。超前注水技術(shù)改善開發(fā)效果機理:超前注水能夠提高地層壓力,減少壓敏傷害;超前注水有利于建立驅(qū)替壓力系統(tǒng),提高原油產(chǎn)量;超前注水有利于提高波及系數(shù)和驅(qū)油效率,提高采收率。超前注水開發(fā)低滲透油藏應(yīng)用技術(shù)界限研究。適應(yīng)油藏地質(zhì)條件:壓力系數(shù)小于0.96的油藏、滲透率小于15mD、流度在0.16~0.60 mD/mPas的油藏建議采用超前注水方式開發(fā),及時補充地層能量;滲透率大于15mD、流度大于0.60 mD/mPas的油藏在通過井網(wǎng)優(yōu)化、儲層整體改造、精細分層注水,可以不采用超前注水,但建議采取同步注水方式開發(fā),防止由于滲透率損失影響開發(fā)效果。超前注水技術(shù)相關(guān)參數(shù)界限:一是超前注水階段合理的地層壓力保持水平為原始地層壓力的120%左右;二是滲透率越低,達到相同地層壓力所需注入孔隙體積倍數(shù)越大,當滲透率為7mD時,達到原始地層壓力120%時,需要注入孔隙體積倍數(shù)0.015PV;三是根據(jù)引起速敏的臨界流速,計算了長10區(qū)塊和朝86區(qū)塊的臨界注水強度,為4.0m~3/d·m;四是計算了長10區(qū)塊和朝86區(qū)塊合理注水強度為2.0~3.5m~3/d·m,超前注水時間4~6個月。在長10區(qū)塊及朝86區(qū)塊開展的超前注水開發(fā)現(xiàn)場試驗,取得了不錯的開發(fā)效果:一是井區(qū)保持較強的吸水能力,能夠滿足超前注水需要;二是地層壓力保持較高水平,能夠建立有效驅(qū)動體系;三是單井產(chǎn)量高,遞減幅度較小;四是兩類油層動用狀況較好;五是與同步注水相比,階段采出程度高,經(jīng)濟效益好。分析研究了開發(fā)5年后超前注水井區(qū)的宏觀及微觀開發(fā)規(guī)律,綜合考慮井區(qū)累計注水量及井區(qū)含水等因素,確定了超前注水井區(qū)的調(diào)整對策及方式,注水強度調(diào)整到1.5m~3/d.m及短周期間注兩種調(diào)整手段。其中對累注水高于2.5×104m~3進行短周期間注,階段采出程度比基礎(chǔ)方案高0.67個百分點,含水低14個百分點;對注水強度高的井區(qū),進行短周期間注及水量下調(diào)方案,使注水強度調(diào)整到1.8m~3/d.m。
[Abstract]:Chaoyang Gou Oilfield is a typical low to very low permeability fractured reservoir with large percolation resistance, poor pressure conductivity and certain pressure-sensitive characteristics. After putting into production, the oil well decreases rapidly and the water injection efficiency is slow. At present, the proven reserves and reserves to be submitted are mainly low, ultra-low permeability and under-pressure reservoirs, which further increase the difficulty of oilfield development. Advanced water injection development can reasonably replenish formation energy, increase formation pressure, prevent reservoir permeability loss, establish effective driving system, and thus increase oil well productivity and decrease decline rate. It is an effective method for the development of low permeability oil fields, which is of great significance to improve the development effect of water drive in Chaoyang Gou Oilfield. Therefore, the mechanism of oil production, the technical limits of advanced water injection and the adjustment countermeasures in the later period are further studied. Advanced water injection technology can improve the mechanism of development effect: advanced water injection can increase formation pressure and reduce pressure sensitivity damage; leading water injection is conducive to establishing displacement pressure system and increasing crude oil production; leading water injection is conducive to improving sweep efficiency and oil displacement efficiency. Increase oil recovery. Study on the technical limits of low permeability reservoirs developed by water injection ahead of time. Suitable for reservoir geological conditions: reservoirs with pressure coefficient less than 0.96, permeability less than 15mD, mobility at 0.16m 0.60 mD/mPa?s should be developed by advanced water injection, and the formation energy should be replenished in time. In reservoirs with permeability greater than 15mDand mobility greater than 0.60 mD/mPa?s, the reservoir can be optimized by well pattern optimization, the reservoir is reformed as a whole, and fine stratified water injection can not be adopted. However, it is suggested that simultaneous water injection should be adopted to prevent the development effect from being affected by permeability loss. The limits of parameters related to advanced water injection technology are as follows: first, the reasonable level of formation pressure in advance water injection stage is about 120% of the original formation pressure; second, the lower the permeability, the greater the volume multiple of injection pores required to reach the same formation pressure. When the permeability is 7mD, when the original formation pressure reaches 120, the porosity volume multiple is 0.015 PV.The third, the critical water injection intensity of Chang10 block and Chao86 block is calculated according to the critical velocity of velocity. The reasonable water injection intensity of Chang 10 block and Chao 86 block is 2.0~3.5m~3/d m, and the lead injection time is 4 ~ 6 months. Field tests of water injection ahead of Chang10 and Chao86 blocks have achieved good development results: first, the well area maintains a relatively strong water absorption capacity to meet the needs of advanced water injection; and second, the formation pressure maintains a high level. It can set up an effective driving system; third, the single well production is high, the decline range is small; fourth, the production condition of two kinds of oil layers is better; fifth, compared with synchronous water injection, the stage recovery degree is higher, and the economic benefit is good. This paper analyzes and studies the macro and micro development rules of water injection well area after 5 years of development, synthetically considers the factors such as cumulative water injection rate and water cut in well area, and determines the adjustment countermeasures and methods of leading water injection well area. Water injection intensity adjustment to 1.5m~3/d.m and short-week injection two adjustment means. The stage recovery degree is 0.67% higher than that of the basic scheme, and the water cut is 14% lower than that of the basic scheme. For the wells with high water injection intensity, the injection during the short week and the down-regulation of the water quantity are carried out. The water injection intensity was adjusted to 1.8 mb / d.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE357.6
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本文編號：1989884