大慶油田扶楊油層體積壓裂技術(shù)研究
發(fā)布時間：2018-12-16 19:07
【摘要】：扶楊油層是大慶外圍油田主要后備石油產(chǎn)量接替地區(qū),屬于低—特低滲透、以巖性為主的復(fù)合型油藏,自然產(chǎn)能低。近幾年,改造方面針對扶楊儲層特點,形成了以CO2泡沫壓裂技術(shù)、清潔壓裂液技術(shù)、低傷害水基壓裂液體系低傷害壓裂增產(chǎn)工藝,解決了部分扶楊油層進一步提高單井產(chǎn)能的技術(shù)難題,但存在壓裂成本較高的問題,難以在開發(fā)上推廣。扶楊油層的剩余儲量大體分布在大慶長垣、龍西-巴彥查干、齊家北、肇源—裕民以及提交儲量的周邊地區(qū)及分散區(qū)塊。扶楊油層含油產(chǎn)狀逐年變差:儲層孔隙度一般10-15%,滲透率高的幾個毫達西、低的還不到0.05×10-3μm2,泥質(zhì)含量一般8-15%,有的在20%以上;原油物性相對較差(密度0.86-0.87、凝固點33-35℃),自然產(chǎn)能低,壓前經(jīng)提撈、氣舉和MFE等測試,日產(chǎn)油僅幾公升到幾百公升�？偟膩砜�,按儲層滲透率和原油流度,扶楊油層未動用儲量分為四類,多分布在Ⅱ、Ⅲ類儲層。在開發(fā)改造方面,開展了多個區(qū)塊的水驅(qū)試驗,從反九點井網(wǎng)到矩形井網(wǎng),井排距從300m縮小到60m。試驗表明,矩形井網(wǎng)300m×300m無法建立驅(qū)替關(guān)系;300m×60m井距在部分區(qū)塊能建立驅(qū)替關(guān)系,但效果不好,采出程度低。對于水平井常規(guī)分段壓裂改造工藝,主要優(yōu)化了段數(shù)與改造規(guī)模兩者的關(guān)系,在造人工裂縫工藝上沿用直井改造方式,單縫的供油能力實際沒有得到提高,壓后產(chǎn)能效果完全依賴改造段數(shù),改造效果也往往達不到水平井預(yù)期的增產(chǎn)效果。本文建立了流線模擬分析方法,對于平面選井及縱向選層具有很好的指導(dǎo)性,為工藝措施優(yōu)化提供了有力的技術(shù)支持�，F(xiàn)場試驗按同一卡段最小滲透率40md以下的層,采用對應(yīng)壓裂;40md以上的層單壓水井,可以調(diào)整注采剖面,完善注采關(guān)系。通過模擬分析,確定了不同物性儲層在同一卡段合注的非均質(zhì)性界限值,為卡段均衡注水提供了理論依據(jù)。
[Abstract]:Fuyang reservoir is the main reserve oil production replacement area in Daqing peripheral oil field, which belongs to the compound reservoir with low-very low permeability and lithology, and its natural productivity is low. In recent years, according to the characteristics of Fuyang reservoir, in the aspect of revamping, CO2 foam fracturing technology, clean fracturing fluid technology, low damage water base fracturing fluid system, low damage fracturing and increasing production technology have been formed. The technical problem of further improving single well productivity in some Fuyang reservoirs is solved, but the problem of high fracturing cost is difficult to be popularized in development. The remaining reserves of Fuyang oil reservoir are mainly distributed in Daqing Placanticline, Longxi-Bayan Chagan, Qijiabei, Zhaoyuan-Yumin and the surrounding areas and scattered blocks of submitted reserves. The oil-bearing occurrence of Fuyang reservoir has become worse year by year: the porosity of reservoir is 10-15, the permeability is several mordaci, the low is less than 0.05 脳 10-3 渭 m ~ (2), and the muddy content is 8-15%, some is above 20%; The physical properties of crude oil are relatively poor (density 0.86-0.87, freezing point 33-35 鈩，
本文編號：2382896
[Abstract]:Fuyang reservoir is the main reserve oil production replacement area in Daqing peripheral oil field, which belongs to the compound reservoir with low-very low permeability and lithology, and its natural productivity is low. In recent years, according to the characteristics of Fuyang reservoir, in the aspect of revamping, CO2 foam fracturing technology, clean fracturing fluid technology, low damage water base fracturing fluid system, low damage fracturing and increasing production technology have been formed. The technical problem of further improving single well productivity in some Fuyang reservoirs is solved, but the problem of high fracturing cost is difficult to be popularized in development. The remaining reserves of Fuyang oil reservoir are mainly distributed in Daqing Placanticline, Longxi-Bayan Chagan, Qijiabei, Zhaoyuan-Yumin and the surrounding areas and scattered blocks of submitted reserves. The oil-bearing occurrence of Fuyang reservoir has become worse year by year: the porosity of reservoir is 10-15, the permeability is several mordaci, the low is less than 0.05 脳 10-3 渭 m ~ (2), and the muddy content is 8-15%, some is above 20%; The physical properties of crude oil are relatively poor (density 0.86-0.87, freezing point 33-35 鈩，
本文編號：2382896
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