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Lean gas injection into an extra light oil reservoir - initial results and further steps

机译：将稀薄的天然气注入额外的轻质油藏-初步结果和进一步步骤

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摘要

Ležište Tisza-1 nalazi se na vrhu jugoistočnog dijela polja Algyo u Madžarskoj. Ležište na dubini od 1 700 m razvijeno je u vrhu serije pješčenjaka i dobrih je svojstava. Dobro sortiran, srednjozrnati i krupnozrnati pješčenjak sadrži ekstra laganu sirovu naftu: ležišni volumni faktor je gotovo 4,0 bbl/bbl, gustoća nafte je 63° API (727 kg/m~3). Ekstremne karakteristike ležišne nafte znače da je srednji sadržaj srednjih ugljikovodika iznad 34 mol%. Proizvodnja je započela 1986. godine. Osamnaestogodišnja eksploatacija pokazala je da je primarni mehanizam istiskivanja nafte jak vodonaporni režim. Do kraja 2004. godine pridobiveno je 53% nafte, ležišni je tlak pao za 8,1 bar s prosječnom količinom vode u kapljevini oko 20%. Kontrolni karotažni dijagrami pokazali su da oko 35% pornog volumena nije bilo zahvaćeno podinskom vodom. Glavni cilj upravljanja ležištem bio je povećati pridobivanje srednjih komponenti i istiskivanje nafte iz pokrovnih zona upotrebom suhih plinova. U cilju procjene mogućnosti utiskivanja plina razvijen je 3D složeni simulacijski model. Statički model bio je povećan do jedinica protjecanja koje odgovaraju međusobno povezanim ležišnim stijenama nastalim u identičnim uvjetima sedimentacije. Uspoređujući načine daljnjeg iskorištavanja ležišta, pokazalo se da se utiskivanjem plina pridobivost srednjih komponenti povećava za 11%.%The Tisza-1 reservoir is situated at the top of the SE part of Algyo field, Hungary. The 1 700 meters deep reservoir is developed in the uppermost sandstone series showing good reservoir quality. The well sorted, middle and coarse grain sandstone contains extra light crude: the reservoir volume factor is almost 4.0 res. bbl/bbl and the oil gravity is 63° API. The extreme characteristics of the reservoir oil mean that the intermediate content is above 34-mol%. The production started as early as 1986. The 18-year exploitation history has proved the strong bottom water drive as the primary driving mechanism. By the end of 2004, 53% of oil recovery was reached, while the reservoir pressure drop was 8.1 bars with average water cut of about 20%. Control logs have indicated that about 35% of the net pay pore volume has been unaffected by the bottom water. The main aim of the reservoir management was to increase the recovery of the intermediates and to sweep the oil from the upper zones by using dry gases. A 3D, compositional simulation model was developed to evaluate the potential of the gas injection. The static model has been up-scaled to flow units corresponding to the interconnected reservoir rock bodies of identical depositional environment. Comparing the production forecast cases, the gas injection showed an additional 11% recovery of intermediates. During the modeling, the use of different gases was investigated. The economic evaluation was highly affected by the developed gas market environment, but finally lean gas was chosen for injection purposes. The gas injection project started in 2000 after four years of planning and preparation. This case study summarizes the planning, and preparation of the gas injection project, highlights the economic dilemmas, and shows the latest results of the process.
机译：Tisza-1矿床位于匈牙利Algyo油田东南部的顶部。在一系列砂岩的顶部开发了深度为1,700 m的矿床，并具有良好的性能。分类合理的中粒和粗粒砂岩含有额外的轻质原油：储层体积因子几乎为4.0 bbl / bbl，油密度为63°API（727 kg / m〜3）。储层油的极端特性意味着中间烃的平均含量高于34 mol％。 1986年开始生产。十八年的开发表明，驱油的主要机理是强大的水压机制。到2004年底，已提取了53％的石油，储层压力下降了8.1巴，液体中的平均水量约为20％。对照测井图显示，约35％的孔隙体积不受地下水影响。储层管理的主要目标是增加中间组分的提取量，并使用干燥气体从覆盖区驱替石油。为了评估注气的可能性，开发了3D复杂模拟模型。将静态模型扩展为对应于在相同沉积条件下形成的相互连接的储集岩的流动单元。比较储层的进一步开发方法，结果表明，注气可使中间组分的产率提高11％。％Tisza-1储层位于匈牙利Algyo油田东南部的顶部。最上层的砂岩系列已开发了1,700米深的储层，显示出良好的储层质量。分类正确的中，粗粒砂岩含有少量轻质原油：储层体积因子几乎为4.0 res。 bbl / bbl和油的重力为63°API。储层油的极端特性意味着中间含量高于34摩尔％。生产早在1986年就开始了。18年的开采历史已将强大的底水驱动作为主要驱动机制。到2004年底，已达到53％的石油采收率，而油藏压降为8.1巴，平均含水量约为20％。控制记录表明，净净孔隙体积的约35％不受底水的影响。储层管理的主要目的是增加中间产物的采收率，并通过使用干燥气体将油从上部区域清除。开发了3D成分模拟模型以评估气体注入的潜力。静态模型已按比例放大到与相同沉积环境的互连储集岩体相对应的流动单元。比较生产预测案例，注气显示中间体回收率提高了11％。在建模期间，研究了不同气体的使用。经济评估受到发达的天然气市场环境的极大影响，但最终选择了贫气用于注入。经过四年的规划和准备，该注气项目于2000年开始。该案例研究总结了注气项目的计划和准备工作，突出了经济难题，并显示了该过程的最新结果。

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