Efficiency improvement of foam-acid treatments and selective large-volume acidizing at carbonate reservoirs of Tatneft PJSC

UDK: 622.376.63
DOI: 10.24887/0028-2448-2019-11-116-119
Key words: selective acidizing, matrix acidizing, foam-acid, acid diversion, plugging effect, large-volume treatment
Authors: M.Kh. Musabirov (TatNIPIneft, RF, Bugulma), A.Yu. Dmitrieva (TatNIPIneft, RF, Bugulma), R.F. Khusainov (Technology Development Centre of Tatneft PJSC, RF, Almetyevsk), E.M. Abusalimov (Technology Development Centre of Tatneft PJSC, RF, Almetyevsk), B.G. Ganiev (Tatneft PJSC, RF, Almetyevsk), F.Z. Ismagilov (Tatneft PJSC, RF, Almetyevsk)

For more than a century, matrix acidizing has been one of the most common methods to enhance productivity of oil producing wells. Domestic and foreign researchers have developed numerous modifications of acidizing systems and plenty of technologies to inject them into formations. The treatments are carried out with varying degree of success depending on concrete geological settings and reservoir conditions. The effectiveness of matrix acidizing of sandstone and carbonate reservoirs penetrated by vertical and horizontal wells depends on a number of factors. Natural factors are the type of a reservoir, geological setting, macro- and micro-heterogeneity of a reservoir, physical and chemical properties of formation fluids, reservoir pressure and temperature, oil- and water saturation, structure of residual reserves in the well drainage area, well interference, etc. Operational and engineering factors are associated with proper selection of candidate wells, effective preparation works on the wellsite, proper selection of acidizing system, engineering design, acid and other chemicals retention time, the completion method and the quality of completion jobs, competence of staff, whether reservoir energy is maintained or not, well design, optimal bottomhole pressure and reservoir pressure (underbalance), duration of aftereffect, etc. Low success of matrix acidizing is attributed, mainly, to poor distribution of acid in the reservoir, plugging of pore space by chemical reactions’ products, shallow acid penetration, etc. Innovative treatment methods to enhance production from heterogeneous carbonate reservoirs are in high demand. The paper discusses two promising methods – foam-acid treatment and selective large-volume acidizing.


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