SU899833A1

SU899833A1 - Disconnector

Info

Publication number: SU899833A1
Application number: SU802896272A
Authority: SU
Inventors: Фраим Фриделевич Конрад; Николай Николаевич Кошелев; Владислав Николаевич Панов; Григорий Федорович Пасниченко
Original assignee: Всесоюзный научно-исследовательский институт по креплению скважин и буровым растворам
Priority date: 1980-03-19
Filing date: 1980-03-19
Publication date: 1982-01-23

Description

(54) РАЗЪЕДИНИТЕЛЬНОЕ УСТРОЙСТВО(54) DISCONNECTING DEVICE

1one

Изобретение относитс к бурению скважин , а именно к разъединител м, включаемым в- компановку низа бурильной колонны дл разъединени ее в случае возникновени прихвата инструмента.The invention relates to the drilling of wells, namely to disconnectors that are included in the bottom hole assembly for disengaging it in the event of a tool sticking.

Известен гидравлический разъединитель, содержащий муфту и ниппель, соединенные левой резьбой и жестко зафиксированные штифтами, взаимодействующими с полым выталкивателем, который при перемещении в осевом направлении обеспечивает разфиксацию резьбового соединени и разъединени муфты от ниппел 1.A hydraulic disconnector is known comprising a coupling and a nipple connected by a left-handed thread and rigidly fixed with pins interacting with a hollow ejector, which, when moved in the axial direction, disengages the threaded connection and disconnects the coupling from nipple 1.

Недостатком разъединител вл етс невозможность использовани в глубоком бурении в св зи .е ослаблением поперечного сечени его элементов по сравнению с ут желенными бурильными трубами и ненадежностью конструкции узла фиксации, способной деформироватьс при длительном воздействии знакопеременных нагрузок осевого и радиального направлений.The disadvantage of the disconnector is the impossibility of using it in deep drilling due to the weakening of the cross section of its elements compared to loose drill pipes and the unreliability of the fixing unit design that is able to deform under long-term exposure to alternating axial and radial loads.

Наиболее близким к предлагаемому по технической сущности вл етс разъединительное устройство, содержащее корпус, верхний переводник с кулачками, соединенный с корпусом левой резьбовой, и кулачковую муфту 2.Closest to the proposed technical entity is a disconnecting device comprising a housing, an upper sub with cams, connected to the left threaded housing, and a cam clutch 2.

Недостатками этого устройства вл ютс невозможность компенсации износа торцов левой резьбы корпуса и верхнего переводника , в процессе работы в скважине, чтоThe disadvantages of this device are the inability to compensate for the wear of the ends of the left thread of the housing and the upper sub, during operation in the well, that

5 приводит к ослаблению нат га в резьбе и ее износу, а также невозможность многократного соединени - разъединени по левой резьбе в скважинных услови х.5 leads to a weakening of the tension in the thread and its wear, as well as the impossibility of multiple connections - separation along the left thread in the well conditions.

Цель изобретени - повышение надеж-- ности работы устройства при многократном использовании путем создани гарантированного нат га в левой резьбе.The purpose of the invention is to increase the reliability of the device operation with repeated use by creating a guaranteed tension on the left thread.

Указанна цель достигаетс тем, что йуфта подпружинена, кулачки муфты и верхнего переводника выполнены наклонными сThis goal is achieved by the fact that the yufta is spring-loaded, the cams of the coupling and the upper sub are inclined with

15 возможностью проскальзывани при левом вращении верхнего переводника, а верхний торец корпуса, контактирующий с верхним переводником, выполнен .в виде прорезной пружины.15 with the possibility of slippage with the left rotation of the upper sub, and the upper end of the housing in contact with the upper sub is made in the form of a slotted spring.

Claims

FIG. 1 shows a general view of the device in section, when working in a line-up of the bottom of the drillstring; in fig. 2 — sweep the interaction of the cams of the upper sub and the coupling; in fig. 3 is a section A-A in FIG. one; in fig. 4 - the device after the left threads are uncoupled; in fig. 5 - extracted from the well to the surface of the device. The device consists of a housing 1, an upper sub 2 with inclined cams 3, which interact with counter cams 4 of the coupling 5. The case and the upper sub are connected by a left thread 6, which is created by means of a slotted spring 7, made on the upper end of the housing 1. In the lower part of the housing there is a sub 8, in which a spring 9 is placed, which presses the cam coupling 5 to the upper sub 2. The coupling 5 is connected to the housing 1 by a splined connection 10. Inside the device there is a hollow plunger 11 with a saddle in the upper part For ball throw 12. In the sub 2 there are holes 13 with plugs 14 sealed with cuffs 15. A spring ring 16 is installed below the holes 13 to secure the hollow pusher 11. A floating piston 17 is placed between the And pusher and the upper sub 2. To move the coupling 5, the pusher 11 has projections 18. The device works as follows. A release device is installed in the bottom hole assembly and lowered from the pipe string to the well for drilling. During the drilling process, the torque from the upper sub 2 is transmitted to the housing 1 through the cams 3 of the sub 2, to the cams 4 of the coupling 5 and then through the splined joint to the housing 1. In the event of sticking of the tool and the need to disconnect, the ball 12 is dropped into the drill string hollow pusher seat 11. An overpressure is created in the pipe string. The hollow plunger 11 of the protrusion 18 through the spline connection 10 moves the coupling 5 to the lower position and disengages the cams 3 and 4 (Fig. 2). The moment of disconnection is determined by a noticeable drop in pressure, since in this case the opening 13 is released from the pressure drop from the sealing plugs 14. The return of the hollow pusher I and together with the cam sleeve 5 is prevented by the stop ring 16. Fluid from the pipes flows out of the holes 13. Turning the tool to the right produces the flap of the top sub 2 from the housing 1, after which the top sub 2 is raised to the surface with a hollow pusher 11 and a ball 12 (Fig. 5). To reunite the disconnecting device in the well in the extracted unit, the hollow plunger 11 is returned to its original position, the ball 12 is removed, the sealing plugs 14 are installed and lowered into the well. Turn the tool to the left, connect it to the part of the disconnecting device remaining in the well. Due to the fact that the cams of the sub and the coupling are tilted in the direction of left rotation, they freely slip over each other, and the spring 9 ensures their contact. A rigid cutting of the spring 7, is made on the upper end of the case, provides guaranteed tension in the left thread 6. The use of a disconnecting device provides reliable disconnection - connecting the drill pipe in the right place and increases the efficiency of emergency response operations. Claims Disconnecting device comprising a housing, an upper sub with cams connected to the casing with a left-hand thread, and a cam clutch, characterized in that, in order to increase the reliability of the device during repeated use by creating a guaranteed tension on the left-hand thread, the clutch is spring-loaded cams the couplings and the upper sub are made inclined with the possibility of slippage with the left rotation of the upper sub, and the upper end of the body in contact with the upper sub is performed ene in the form of a slotted spring. Sources of information taken into account during the examination 1. USSR author's certificate No. 438774, cl. E 21 B 23/00, 1973.

2. USSR author's certificate number 570693, cl. Е 21 В 23/00, 1975 (prototype).

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FIG. I

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