SU960424A1

SU960424A1 - Method of isolating the inflow of formation waters into well

Info

Publication number: SU960424A1
Application number: SU813235286A
Authority: SU
Inventors: Георгий Дементьевич Савенков; Владимир Михайлович Дорошенко; Василий Степанович Бойко; Иосиф Николаевич Костур; Василий Гервасиевич Касянчук; Любовь Петровна Гринкевич
Original assignee: Ивано-Франковский Институт Нефти И Газа
Priority date: 1981-01-12
Filing date: 1981-01-12
Publication date: 1982-09-23

Description

Изобретение относится к области нефтедобывающей промышленности, в частности к способам изоляции притока пластовых вод в скважине.The invention relates to the field of oil industry, in particular to methods for isolating the influx of formation water in a well.

Известен способ изоляции пластовых вод созданием водоизолирующих мостов цементными растворами, включающий спуск заливочных труб до места установки моста, присоединение вертлюга и промывку забоя, отсоединение вертлюга, приподъем заливочных труб и ввинчивание в верхний их конец заливочной головки, закачку цементного раствора и его продавку из заливочных труб, промывку скважины (1].A known method of isolating produced water by creating water-insulating bridges with cement mortars, including lowering the casting pipes to the bridge installation site, attaching the swivel and flushing the face, disconnecting the swivel, raising the casting pipes and screwing them into the upper end of the casting head, injecting the cement mortar and selling it from the pouring pipes flushing the well (1].

Недостатком этого способа является длительность и сложность проведения процесса изоляции.The disadvantage of this method is the duration and complexity of the isolation process.

Кроме того недостатком является то, что создание цементных мостов в скважинах с высокой поглотительной способностью требует закачки большого количества цементного раствора, а кровля моста, как правило, не соответствует заданной глубине его установки . Это приводит либо к частичной закупорке нефтегазонасыщенных интервалов, либо к неполному перекрытию обводненных интервалов.In addition, the disadvantage is that the creation of cement bridges in wells with high absorption capacity requires the injection of a large amount of cement mortar, and the roof of the bridge, as a rule, does not correspond to the specified installation depth. This leads either to a partial blockage of oil and gas saturated intervals, or to incomplete overlap of waterlogged intervals.

Известен способ изоляции притока пластовых вод в скважину, заключающийся в закачке в водоносный пласт в жидкости-носителе гранулированного магния, взаимодействующего с пластов вой водой с образованием осадка [2J.A known method of isolating the influx of formation water into the well, which consists in injecting granular magnesium into the aquifer in a carrier fluid, interacting with the formation water with formation of sediment [2J.

Однако известный способ не позволяет достаточно эффективно иэолировать приток пластовых вод в скважину ¹ особенно при наличии подошвенных вод. Целью изобретения является повышение эффективности процесса изоляции.However, the known method does not allow sufficiently efficiently to aerate the inflow of formation water into the well ^1, especially in the presence of bottom water. The aim of the invention is to increase the efficiency of the isolation process.

Указанная цель достигается тем, что согласно способу, изоляции притока пластовых вод в скважинезаключающей муся в закачке в обводненный пласт в жидкости-носителе гранулированного ’магния,взаимодействующего с плас20 товой водой с образованием осадка, одновременно с закачкой магния в пласт в скважине создают из магния мост, перекрывающий обводненный пласт в интервале от его забоя до 25 кровли путем поддержания скорости исходящего потока жидкости-носителя меньше скорости падения гранул магния в ней.This goal is achieved by the fact that, according to the method, isolating the influx of formation water into the well, including pumping water into the flooded formation in a carrier fluid of granular magnesium interacting with the bed water to form a precipitate, simultaneously with the injection of magnesium into the formation in the well, a bridge is created from magnesium covering the flooded layer in the interval from its bottom to the 25th roof by maintaining the speed of the outgoing flow of the carrier fluid is less than the rate of fall of the magnesium granules in it.

Способ осуществляется следующим 30 образом.The method is carried out as follows 30.

В скважину диаметром 0,146 м, вскрывшую трещиновато-пористый пласт на глубине 1960-2000 м поступает подошвенная вода из интервала 19902000 м (объем скважины в обводненном интервале составляет 0,125 м’). с ' целью изоляции притока воды по технологии гидравлического разрыва производят раскрытие трещинки закачивают в скважину 200 кг гранулированного магния в 10 м³ воды четырьмя агрегатами 4АН-700 на третьей скорости при расходе 1,88 м^э/мин (скорость нисходящего потока 1,87 м/с) После закачки 200 кг гранулированного магния в трещины пласта производят закачку 108 кг гранулированного магния в 5 м³ воды (103 кг = . _ = 0,125 -мЗ*8б0 кг/м^, где 860 кг/мнасыпная плотность гранулированного магния) одним агрегатом 4АП-700 на второй скорости с расходом 0,23 м³/мин“ (скорость нисходящего потока 0,22 м/с. скорость падения гранул магния / J 0,4 м/с). После создания расчетного слоя магния на забое, скважин/ закрывают и по истечении 60 ч реакции гидролиза магния, потребных для образования водоизоляционной структуры, вводят в эксплуатацию.Plantar water from the interval of 19902000 m (well volume in the flooded interval is 0.125 m ') enters the well with a diameter of 0.146 m, which opened the fractured-porous layer at a depth of 1960-2000 m. in order to isolate the influx of water using hydraulic fracturing technology, the crack is opened crack 200 kg of granular magnesium in 10 m ^{3 of} water are pumped into the well with four 4AN-700 units at a third speed at a flow rate of 1.88 m ^e / min (downward flow velocity of 1.87 m / s) After 200 kg of granular magnesium is injected into the formation cracks, 108 kg of granulated magnesium is injected into 5 m ^{3 of} water (103 kg =. _ = 0.125 -mZ * 8b0 kg / m ^, where 860 kg / bulk density of granular magnesium) is unit 4AP-700 at a second speed with a flow rate of 0.23 m ³ / min “(speed no downward flow 0.22 m / s. the speed of the fall of the granules of magnesium / J 0.4 m / s). After creating the calculated magnesium layer at the bottom, the wells are closed and after 60 hours the magnesium hydrolysis reaction, required for the formation of a waterproofing structure, is put into operation.

Осуществление закачки порции гранулированного магния объемом, равным 30 объему скважины в- интервале от забоя «до кровли обводненного пласта, с поддержанием скорости нисходящего потока жидкости-носителя меньше скорости падения гранулированного;магния позволяет создавать йа забое скважины водоизоляционные мосты расчетной толщины одним технологическим приемом с закупоркой обводненных трещин. Скорость нисходящего потока регулируется расходом жидкости-носителя так, чтобы она была; меньше скорости падения гранул магния в жидкости-носителе. Этим обеспечива- · ется выпадение расчетной массы гранулированного магния на забой скважины. При использовании, например, воды в качестве жидкости-носителя! скорость нисходящего потока, определяемая частным от деления расхода жидкости-носителя магний на площадь поперечного сечения эксплуатационной колонны ниже башмака насосно-компрессорных труб, должн а быть меньше 0,4 м/с (скорость падения гранул в жидкостигносителе оценивается, например, по формуле Стокса).Carrying out the injection of a portion of granular magnesium with a volume equal to 30 well volume in the interval from the bottom "to the roof of the flooded formation, while maintaining the speed of the downward flow of the carrier fluid is lower than the rate of fall of the granular; magnesium allows the formation of waterproofing bridges of the calculated thickness in the bottom of the well in one technological method with blockage waterlogged cracks. The speed of the downward flow is regulated by the flow rate of the carrier fluid so that it is; less than the rate of fall of the granules of magnesium in the carrier fluid. This ensures that the calculated mass of granular magnesium falls out at the bottom of the well. When using, for example, water as a carrier fluid! the downward flow rate, determined by the quotient of dividing the flow rate of the magnesium carrier fluid by the cross-sectional area of the production string below the shoe of the tubing, should be less than 0.4 m / s (the rate of fall of the granules in the carrier fluid is estimated, for example, according to the Stokes formula) .

Таким образом, предлагаемый способ позволяет повысить эффективность изоляции подошвенных вод путем созI Дания на забой скваЖины водоиэоляционного моста заданной толщины, причем одновременно (одним технологическим приемом) с закупоркой трещин. .Thus, the proposed method allows to increase the efficiency of isolation of bottom water by creating a hole for a well of water-displacement bridge of a given thickness, and at the same time (in one technological technique) with plugging the cracks. .

Использование предлагаемого споСо15 ба изоляции притока пластовых вод обеспечивает по сравнению с известным следующие преимущества: простота создания водоизоляционного моста; точность отсечения обводненных интервалов на забое скважины; исключение необходимости в специальных спуско-подъемных операциях; повышение эффективности и экономичности работ.Using the proposed method for isolating the influx of formation water provides the following advantages in comparison with the known: simplicity of creating a water-proof bridge; accuracy of cutting off waterlogged intervals at the bottom of the well; elimination of the need for special trips; increasing the efficiency and economy of work.

Claims

The invention relates to the field of the oil industry, in particular, to methods for isolating the inflow of formation water in squamous oil. There is a method of isolating reservoir waters by creating water isolating bridges with cement mortars, including lowering the casting pipes to the bridge installation site, attaching the swivel and washing the bottom, disconnecting the swivel, raising the casting pipes and screwing in the upper end of the casting head, pumping cement mortar and prsdavka from pipe casting, washing the well 1. The disadvantage of this method is the length and complexity of the isolation process. In addition, the disadvantage is that the creation of cement bridges in wells with a high absorption capacity requires the injection of a large amount of cement mortar, and the roof of the bridge, as a rule, does not correspond to the specified depth of its installation. This leads either to a partial blockage of oil and gas intervals, or to an incomplete overlap of the watering intervals. A known method for isolating the inflow of formation water into a well consists in pumping granulated magnesium into a carrier fluid in a carrier fluid, which interacts with the formation water to form sediment 2. However, the known method does not allow to sufficiently isolate the inflow of formation water into the well, especially presence of bottom waters. The purpose of the invention is to increase the efficiency of the insulation process. This goal is achieved in that according to the method of isolating the flow of formation water in the well ,. enclosing the crayfish in injection into the flooded formation in the carrier fluid of granular magnesium, which interacts with the reservoir water to form sediment, simultaneously with the injection of magnesium into the reservoir in the well, create a magnet bridge overlying the flooded formation in the interval from its slaughter to the roof by maintaining the speed of the outgoing the flow of the carrier fluid is less than the rate of fall of the magnesium granules in it. The method is carried out as follows. In the well with a diameter of 0.146 m, the overburden of the fractured-porous plate at a depth of 1960-2000 m enters the ground water from the interval of 1990 000 m (the volume of the well in the interval is 0.125 m). In order to isolate water inflow using hydraulic fracturing technology, fractures are opened and 200 kg of granules of SJOBaHHoro magnesium in 10 m of water are pumped into the well with 4AN-700 four units at a third speed at a flow rate of 1.88 mVmin (downstream speed of 1.87 m After injection of 200 kg of granulated magnesium into the tertiary strata of the reservoir, 108 kg of granulated magnesium are injected into 5 m of water (103 kg. 0.125 m3 VBO kg / m, where 860 kg / m is the bulk density of granulated magnesium) in one unit 4АI-700 speeds with a flow rate of 0.23 (downstream speed 0.22 m, the fall rate of magnesium is 0.4 m / s. After creating a calculated layer of magnesium at the bottom, the wells are closed and, after 60 hours of the hydrolysis reaction, the magnesium required for the formation of an insulated structure is put into operation. The injection of a portion of granulated magnesium with a volume equal to the volume of the well in the interval from the bottom to the roof of the flooded reservoir, while maintaining the downward flow rate of the carrier fluid less than the velocity of the fall of granular magnesium allows creating a bottom hole. The calculated thickness is one technological method with blocked watered cracks. The rate of the downward flow is regulated by the flow rate of the carrier fluid so that it is; less falling speed: magnesium granules in a carrier fluid. This ensures the loss of the calculated mass of granulated magnesium to the bottom of the well. When using, for example, WATER as a carrier fluid, the speed of the downward flow, determined privately by dividing the flow rate of the carrier fluid magnesium and the cross-sectional area of the production string below the pump-compressor pipe, should be less than 0.4 m / s ( the rate of falling of the granules in the fluid carrier is estimated, for example, by the Stokes formula). Thus, the proposed method makes it possible to increase the effectiveness of isolating the bottom water by creating a water insulating bridge at the well bottom with a predetermined thickness, and at the same time (with a single technological method) with cracking. The use of the proposed method for isolating the inflow of formation water provides, in comparison with the known HbJM, the following advantages: the simplicity of creating a water insulating bridge; cutoff accuracy of watering intervals at the well bottom; eliminating the need for special tripping operations; increase of efficiency and profitability of work. Claims; The method of isolating the reservoir inflow (WOW in the well, which consists in pumping into the watered reservoir in a granular magnesium granular fluid carrier interacting with the stratum water to form a sediment, from the water that In order to increase the efficiency of the isolation process, simultaneously with the injection of magnesium into the reservoir, a bridge is created from the bridge, blocking the flooded plate in the interval — oh its bottom up to the roof by supporting the downward flow rate of the carrier fluid in it. Source Information taken into account in the examination of 1. Lavrushke, PN, Underground Well Repair, M., Nedra, 1968, pp. 381-383.

2. USSR author's certificate number 715771, cl. E 21 B 43/22, 1978 (prototype). .