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METHOD FOR INTERVAL ACIDISING OF HORIZONTAL WELL USING CARBONATE RESERVOIR

机译：碳酸盐岩储层水平井间歇酸化方法

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FIELD: chemistry.SUBSTANCE: method for interval acidising of a horizontal well using a carbonate reservoir, which includes lowering a pipe string into a well; pumping acid compositions into the formation through the pipe string; conducting geophysical investigations in the horizontal well before treatment; selecting and separating intervals of the horizontal well into two groups; the first group includes intervals with permeability of 40-70 mD and water cut of the extracted product of 70-80%; the second group includes intervals with permeability of 5-39 mD and water cut of the extracted product of 50-69%; lowering into the horizontal well a pipe string plugged at the bottom and fitted with two packers with a perforated connecting pipe in between; performing consecutive treatment of the intervals of the horizontal well relating to the first group by sealed cut-off of each interval with subsequent alternating pumping into each interval in three cycles a temporary blocking composition at a rate of 6-12 m/h, the temporary blocking composition used being a water-in-oil emulsion with dynamic viscosity of 120 mPa·s at 20°C, and an acid composition at a rate of 54-66 m/h; after treatment of the intervals of the horizontal well relating to the first group, retrieving the pipe string from the horizontal well; at the mouth of the horizontal well, the pipe string is fitted with a liquid pulsator above the perforated connecting pipe and the pipe string which is plugged at the bottom and fitted with two packers with a perforated connecting pipe in between is once more lowered into the horizontal well; treating the intervals of the horizontal well of the second group by sealed cut-off of each interval with subsequent pulsed pumping into each interval a self-deviating acid composition based on a gelling agent at a rate of 24-36 m/h.EFFECT: intensifying oil extraction from a horizontal well, increasing oil yield and reducing the water cut of the extracted product.3 dwg
机译：领域：化学。物质：使用碳酸盐储层对水平井进行间歇酸化的方法，该方法包括将管柱降低到井中;通过管柱将酸性成分泵入地层;处理前在水平井中进行地球物理调查;选择水平井的间隔并将其分为两组;第一组包括渗透率在40-70 mD的区间，提取产品的含水率在70-80％。第二组包括渗透率为5-39 mD的区间和提取产物的含水率为50-69％。将一根管柱向下插入水平井，该管柱底部插入并装有两个封隔器，两者之间有一个穿孔的连接管;通过密封截断每个井段，对第一组水平井的井段进行连续处理，并随后以三个周期交替泵入临时井堵成分，每个周期为6-12 m / h，所使用的封端组合物是油包水型乳液，在20℃时的动态粘度为120 mPa·s，酸组合物的速率为54-66 m / h。在处理与第一组有关的水平井的间隔之后，从水平井取回管柱;在水平井口处，管柱的多孔连接管上方装有一个液体脉动器，管柱的底部装有两根封隔器，而两根封隔器之间有孔连接管，该管柱再次插入下端。水平井通过密封切下每个井眼的间隔来处理第二组水平井的井眼的间隔，然后以24-36 m / h的速率脉冲泵送入每个井眼的基于胶凝剂的自脱酸组合物。加强水平井的采油，提高采油量，减少采出产品的含水量。3 dwg

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