SU901472A1

SU901472A1 - Interval packer

Info

Publication number: SU901472A1
Application number: SU802889103A
Authority: SU
Inventors: Игорь Павлович Королев; Сергей Викторович Тимошин; Клавдий Павлович Рыболовлев; Степан Михайлович Мазурик; Евгений Борисович Напирай
Original assignee: Печорский государственный научно-исследовательский и проектный институт нефтяной промышленности
Priority date: 1980-03-06
Filing date: 1980-03-06
Publication date: 1982-01-30

Description

Изобретение относится к нефтегазодобывающей промышленности, в частности к устройствам для разобщения ствола скважин при проведении различных технологических операций.The invention relates to the oil and gas industry, in particular to devices for separating a wellbore during various technological operations.

Известен пакер для селективной ⁵ изоляции в процессе бурения, содержащий верхний и нижний герметизирующие элементы, корпус, якорь и фиксирующее устройство для удержания герметизирующих элементов в транспортном положении [1J.Known packer for selective ⁵ isolation during drilling, containing the upper and lower sealing elements, a housing, an anchor and a locking device for holding the sealing elements in the transport position [1J.

В известном пакере герметизирующие элементы удерживаются в рабочем положении лишь при создании нагрузки весом колонны труб и при создании давления в гидравлическом якоре. При подъеме колонны труб (снятии нагрузки с оборудования) и при сбросе давления герметизирующие элементы раз- _мгерметизируют затрубное пространство.In the known packer, the sealing elements are held in position only when a load is created by the weight of the pipe string and when pressure is created in the hydraulic armature. When lifting the pipe string (the load is removed from the equipment) and for resetting the sealing elements different _m-pressure sealed annulus.

Известен также интервальный пакер, включающий верхний и нижний гёр2 метизирующие элементы со стволами, выполненными с радиальными каналами, корпус с окнами, состоящий из связанных колонной труб подвижных упоров верхнего и нижнего герметизирующих элементов, клапанный механизм, якорь^ гильзу и фиксатор, установленный на конце ствола верхнего герметизирующего элемента с возможностью взаимодействия с гильзой [23.An interval packer is also known, including the upper and lower ger2 metering elements with trunks made with radial channels, a case with windows, consisting of movable stops of the upper and lower sealing elements connected by a column of pipes, a valve mechanism, an anchor ^ sleeve and a latch mounted on the end of the barrel upper sealing element with the possibility of interaction with the sleeve [23.

Для сборки пакера необходимо иметь точно изготовленные определенной длины отрезки труб внутренней и наружной колонны. При изменении интервала обработки в каждом конкретном случае необходимо снова изготавливать эти трубы, что отнимает много времени на подготовительные работы и не всегда возможно в промысловых условиях. Незначительные отклонения в длинах соединительных труб приводят к ослаблению одного из резьбовых соединений, что снижает надежность работы пакера.To assemble the packer, it is necessary to have pipe sections of the inner and outer columns that are precisely made of a certain length. When changing the processing interval in each case, it is necessary to produce these pipes again, which takes a lot of time for preparatory work and is not always possible in the field. Slight deviations in the length of the connecting pipes lead to the weakening of one of the threaded joints, which reduces the reliability of the packer.

В известном пакере корпус взаимодействует с подвижными упорами, а гильза и фиксатор - со стволами. Фиксатор, входя в зацепление с гильзой, жестко связывает верхний и нижний стволы, воспринимая на себя всю нагрузку снятия герметизирующих элементов. При работе пакера усилие от давления закачки жидкости дополнительно воздействует на фиксирующий механизм, что существенно снижает работу фиксатора, особенно при высоких давлениях закачки жидкости.In the well-known packer, the housing interacts with the movable stops, and the sleeve and retainer interact with the trunks. The latch, engaging with the sleeve, rigidly connects the upper and lower trunks, perceiving the entire load of removing the sealing elements. When the packer is working, the force from the fluid injection pressure additionally acts on the locking mechanism, which significantly reduces the operation of the retainer, especially at high fluid injection pressures.

Цель изобретения - упрощение конструкции и повышение надежности работы фиксирующих элементов.The purpose of the invention is to simplify the design and increase the reliability of the locking elements.

Поставленная цель достигается тем, что гильза размещена между подвижным упором верхнего герметизирующего элемента и колонной труб и жестко связана с ними.This goal is achieved by the fact that the sleeve is placed between the movable stop of the upper sealing element and the pipe string and is rigidly connected with them.

Такое конструктивное соединение элементов пакера привело к новой функ‘ циональной взаимосвязи элементов.При этом на фиксатор действует только усилие сжатия верхних герметизирующих элементов, а усилие от давления закачки жидкости передается на колонну труб.Such a structural connection of the packer elements led to a new functional interconnection of the elements. In this case, only the compression force of the upper sealing elements acts on the clamp, and the force from the injection pressure of the liquid is transmitted to the pipe string.

На чертеже представлен прилагаемый пакер, общий вид.The drawing shows the attached packer, General view.

Пакер состоит из клапанного механизма, включающего клапан 1 и седло 2. Седло 2 соединено со стволом 3 верхнего пакера, выполненного с радиальными каналами 4 и цилиндром 5 с установленным на конце фиксаторомThe packer consists of a valve mechanism, including valve 1 and seat 2. The seat 2 is connected to the barrel 3 of the upper packer, made with radial channels 4 and cylinder 5 with a latch mounted at the end

6. На ствол 3 насажены герметизирующие элементы 7 и кольцо 8. На ствол 9 нижнего пакера, выполненного с радиальными каналами 10, насажены герметизирующие элементы 11 и кольцо 12. В нижней части ствол 9 нижнего пакера жестко соединен с конусом 13, который, в свою очередь, жестко соединен с цилиндром 14 якорного узла гидравлическо-механического типа, выполненным с радиальными каналами 15, На цилиндр 14 насажен поршень 16, подпружиненный пружиной 17 и соединенный поводками-пружинами 18 со шлипсами 19. В нижней части цилиндр 14 якорного узла жестко соединен с внешним цилиндром 20.6. The sealing elements 7 and the ring 8 are mounted on the barrel 3. The sealing elements 11 and the ring 12 are mounted on the barrel 9 of the lower packer made with radial channels 10. In the lower part, the lower packer barrel 9 is rigidly connected to the cone 13, which, in its the turn is rigidly connected to the cylinder 14 of the hydraulic-mechanical type anchor assembly made with radial channels 15, A piston 16 is mounted on the cylinder 14, spring-loaded with a spring 17 and connected by spring leads 18 with slips 19. In the lower part, the cylinder 14 of the anchor assembly is rigidly connected to vn with another cylinder 20.

Корпус интервального пакера состоит из подвижного упора 21, насажен,ного на ствол 3 верхнего пакера, гильзы 22, выполненной с окном 23The case of the interval packer consists of a movable stop 21, mounted on the barrel 3 of the upper packer, a sleeve 22 made with a window 23

901472 4 и жестко соединенной с упором 21 верхнего пакера и упором 24 нижнего пакера посредством насосно-компрессорных труб 25 и муфты 26, выполненной с окнами 27. Промежуточные насосно-компрессорные трубы 25 предназначены для изменения длины пакера в зависимости от мощности обрабатываемого интервала.901472 4 and rigidly connected to the stop 21 of the upper packer and the stop 24 of the lower packer by means of tubing 25 and a sleeve 26 made with windows 27. The intermediate tubing 25 is designed to change the length of the packer depending on the power of the processed interval.

Внутри интервального пакера проходит колонна труб 28, соединенная с клапаном 1 и заканчивающаяся муфтой 29.Inside the interval packer there is a pipe string 28 connected to the valve 1 and ending with a coupling 29.

Пакер спускают на колонне насосно-компрессорных труб, соединенных с клапанным механизмом, на необходимую глубину. От самопроизвольной пакеровки шлипсы 19 удерживаются пружиной 17, опирающейся на поршень 16. После спуска колонны в ней создается давление порядка 60-70 кг/см , поршень 16 движется вверх, сжимая пружину 17, и шлипсы 19, надвигаясь на конус 13, плотно прижимаются в обсадной колонне. При дальнейшей посадке пакера конус 13 раздвигает шлипсы 19 до врезания их в обсадную колонну. Вес колонны труб передается на герметизирующие элементы 7 и 11, которые одновременно сжимаются и герметизируют кольцевое пространство, при этом фиксатор 6 входит в зацепление с конусными выточками гильзы 22, и происходит фиксация пакерующих элементов. При установившемся рабочем положении пакера окна 4 и 23, 10 и' 27 совмещаются, создавая канал для прохода жидкости.The packer is lowered on a string of tubing connected to the valve mechanism to the required depth. From spontaneous packing, the slips 19 are held by a spring 17 resting on the piston 16. After the column is lowered, a pressure of about 60-70 kg / cm is created in it, the piston 16 moves upward, compressing the spring 17, and the slips 19, moving on the cone 13, are tightly pressed into casing string. With further planting of the packer, the cone 13 pushes the slips 19 until they cut into the casing. The weight of the pipe string is transferred to the sealing elements 7 and 11, which are simultaneously compressed and seal the annular space, while the latch 6 is engaged with the conical recesses of the sleeve 22, and the packing elements are fixed. When the packer is in the operating position, the windows 4 and 23, 10 and '27 are combined, creating a channel for the passage of fluid.

Для создания циркуляции жидкости при промывке приподнимают клапан 1, не доводя муфту 29 до фиксатора 6. При этом жидкость, заключенная в тру* бы, выходит через окна 10 и 27, проходит между корпусом пакера и обсадной колонной и далее через окна 4 и 23 по кольцевому пространству между стволом 3 верхнего пакера и насосно-компрессорными трубами 28, между клапаном 1 и седлом 2 возвращается на поверхность.To create fluid circulation during flushing, lift valve 1 without bringing clutch 29 to lock 6. In this case, the fluid enclosed in the pipe * exits through windows 10 and 27, passes between the packer body and casing and then through windows 4 and 23 through the annular space between the barrel 3 of the upper packer and the tubing 28, between the valve 1 and the seat 2 returns to the surface.

Извлечение пакера на поверхность производят подъемом труб. При этом • муфта 29 выводит фиксатор 6 из зацепления с гильзой 22, упирается в торцовую поверхность ствола 5 верхнего пакера, который, в свою очередь, упирается в подвижный упор и приводит в транспортное положение герметизирующие элементы 7. Одновременно упор 21 увлекает вверх корпус пакера, при этом подвижный упор 24, упираясь в буртик цилинд- 5 ра 9 нижнего пакера, освобождает герметизирующие элементы 11 и конус 13 выходит из-под шлипсов 19. Пружина 17 приводит шлипсы 19 в транспортное положение. ЮRemoving the packer to the surface by lifting pipes. In this case, • the coupling 29 disengages the latch 6 from the sleeve 22, abuts against the end surface of the barrel 5 of the upper packer, which, in turn, abuts against the movable stop and puts the sealing elements 7 in transport position. Simultaneously, the stop 21 carries up the packer body, in this case, the movable stop 24, abutting against the flange of the cylinder 5 ra 9 of the lower packer, releases the sealing elements 11 and the cone 13 leaves the slips 19. The spring 17 brings the slips 19 into the transport position. YU

Предлагаемый пакер обладает рядом преимуществ по сравнению с известной конструкцией, т.е. повышается надежность работы фиксирующего узла, упрощается конструкция пакера, is снижается его металлоемкость, упрох щается сборка пакера и, как следствие, расширяется область его применения. Экономический эффект от использования предлагаемого пакера для уело- 20 • вий НГДУ Тэбукнефть от снижения металлоемкости пакера и дополнительных затрат на перевозку пакера в мастерские, сборку и подгонку промежуточной колонны, а также сокраще- 2$ ния простоев бригады капитального ремонта составит 1,9 тыс.руб. на одну скважино-опирацию.The proposed packer has several advantages compared to the known design, i.e. the reliability of the fixing unit is increased, the design of the packer is simplified, its metal consumption is reduced, the assembly of the packer is simplified and, as a result, the scope of its application is expanded. The economic effect of using the proposed packer for the benefits of oil and gas production facilities Tebukneft from reducing packer metal consumption and additional costs for transporting the packer to workshops, assembling and adjusting the intermediate column, as well as reducing the $ 2 outage of the overhaul crew will amount to 1.9 thousand. rub. on one well-bearing.

Claims

The invention relates to the oil and gas mining industry, in particular, to devices for separating a wellbore during various technological operations. A known packer for selectively isolating a drilling process, comprising upper and lower sealing elements, a housing, a measles and a fixing device for holding the sealing elements in the transport position from. In the known packer, the sealing elements are kept in the working position only when the load is created by the weight of the pipe string and when the pressure is created in the hydraulic core. When lifting the pipe string (removing the load from the equipment) and when the pressure is released, the sealing elements depressurize the annulus. Also known is an interval packer that includes upper and lower hermetic elements with radial 4 and KaHanafw, a housing with windows consisting of from connected pillar pipes of movable stops of the upper and lower sealing elements, valve bellows, bark | a sleeve and a retainer installed at the end of the barrel of the upper sealing element with the possibility of interaction with the sleeve 21. For assembling the packer, it is necessary to have precisely cut the lengths of the tubes of the inner and outer columns of a certain length. When changing the processing interval in each specific case, it is necessary to produce these pipes again, which takes a lot of time for preparatory work and is not always possible in field conditions. Minor deviations in the lengths of the connecting pipes lead to the weakening of one of the threaded connections, which reduces the reliability of the packer. 39 The well-known packer housing interacts with movable stops, and the sleeve and the retainer - with trunks. The latch, the engagement with the sleeve, rigidly connects the upper and lower trunks, taking up the entire load of the removal of the sealing elements. When the packer operates, the force from the fluid injection pressure additionally acts on the fixing mechanism, which significantly reduces the fixer operation, especially at high fluid injection pressures. The purpose of the invention is to simplify the design and increase the reliability of the locking elements. The goal is achieved by the fact that the sleeve is placed between the movable stop of the upper sealing element and the column pipe and is rigidly connected with them. Such a constructive connection of packer elements has led to a new functional interconnection of elements. In this case, only the compressive force of the upper sealing elements acts on the retainer, and the force from the fluid injection pressure is transmitted to the pipe string. The drawing shows the proposed packer, a General view. The packer consists of a valve mechanism that includes a valve 1 and a saddle 2, the saddle 2 is connected to the barrel 3 of the upper packer, made with radial channels 4 and the cylinder 5 with a clamp 6 installed at the end 6. Sealing elements 7 and a ring 8 are mounted on the barrel 3 bottom packer, made with radial channels 10, fitted with sealing elements 11 and ring 12. In the lower part of the barrel 9 of the lower packer is rigidly connected to the cone 13, which, in turn, is rigidly connected to the cylinder} k of the core node of the hydraulic-mechanical type , made with radial channels 1 A piston 16 is spring-mounted on a cylinder} Z, spring 17 loaded and connected by springs 18 leads with spikes 19. In the lower part the cylinder C of the core assembly is rigidly connected to the external cylinder 20 The case of the interval packer consists of a movable stop 21, mounted on the barrel 3 of the upper packer, the sleeve 22, made with the window 23 2 and rigidly connected to the stop 21 of the upper packer and the stop 2 of the lower packer by means of tubing pipes 25 and the coupling 26, made with windows 27. Intermediate pump-compressor t The tubes 25 are intended to change the length of the packer depending on the power of the interval being processed. Inside the interval packer, a column of pipes 28 passes, which is connected to valve 1 and ends with coupling 29. The packer is lowered to the required depth on the tubing string connected to the valve mechanism. From spontaneous packing, the slips 19 are held by the spring 17 supported on the piston 16. After the column is lowered, a pressure in the order of 60-70 kg / cm is created in it, the piston 16 moves upward, compressing the spring 17, and the slips 19 pushing the cone 13 tightly against in the casing. Upon further planting of the packer, the cone 13 moves apart the splinters) 19 until they are embedded in the casing. The weight of the pipe string is transmitted to the sealing elements 7 and 11, which are simultaneously compressed and seal the annular space, while the retainer 6 is engaged with the tapered grooves of the sleeve 22, and the packer elements are fixed. With the steady-state working position of the packer, the windows and 23, 10 and 27 are combined to create a channel for the passage of fluid. In order to circulate the fluid during flushing, the valve 1 is raised, not bringing the coupling 29 to the latch 6. At the same time, the fluid enclosed in pipes comes out of the windows 10 and 27, passes between the packer body and the casing and then through the windows and 23 through the annular the space between the upper packer barrel 3 and the tubing 28, between the valve 1 and the saddle 2 is returned to the surface. Removing the packer to the surface is done by lifting the pipes. When this coupling 29 removes the latch 6 from engagement with the sleeve 22, abuts against the end surface of the barrel 5 of the upper packer, which, in turn, abuts against the movable stop 59 21 and brings the sealing elements 7 into transport position the packer, while the movable stop 2A, abutting against the collar of the cylinder 9 of the lower packer, releases the sealing elements 1t and the cone 13 comes out from under the slips 19. The spring 17 leads the slips 19 into the transport position. The proposed packer has several advantages compared with the known construction, i.e. the reliability of the fixing unit is improved, the design of the packer is simplified, its metal intensity is reduced, the packer assembly is simplified and, as a result, its scope is expanded. The economic effect of using the proposed packer for the NGDU Tebukneft conditions from the reduction of the metal content of the packer and the additional costs of transporting the packer to the workshops, assembling and adjusting the intermediate column, as well as reducing the downtime of the capital repair crew will be 1.9 thousand rubles. on one well support. Claims of the invention Interval packer, including upper and lower sealing elements with trunks made with radial channels, housing with windows, consisting of connected column pipes of movable stops of the upper and lower sealing elements, valve mechanism, measles, sleeve and retainer mounted on end of the upper sealing element with the ability to interact with the sleeve, which differs (which, in order to simplify the design and increase the reliability of the fixing elements, the sleeve is placed and between the movable stop of the upper sealing element and the column pipe and is rigidly connected with them. Sources of information taken into account in the examination 1.US Patent D, class E 21 V 33/12, published, 196.

2. USSR author's certificate tf 613081, cl. E 21 V 33/12, 1975 (prototype).