Hydraulic iasi double action

 

The invention relates to the oil and gas industry, in particular to a hydraulic Assam double action designed to free stuck in a wellbore equipment during drilling and test beds. The device includes a hollow cylindrical body. Inside the housing telescopically mounted rod with a through axial channel, the associated splined connection. In the middle part of the rod has a piston placed in the working cylinder and having a throttling channel. The slave cylinder on the length of stroke of the piston is formed inside the housing cylinder sleeve. In the middle part of the cylinder liner are sealed relative to the housing, and on both sides of the seal forming with the casing an annular cavity. Above and below the working cylinder adjustably mounted annular separating piston. By the end gap of the ring cavity communicated respectively with newportnews and podpornoy cavities of the working cylinder. Cylinder sleeve has a wall on opposite sides of the seal through the radial holes. The cavity of the working cylinder filled with hydraulic fluid. Iasi has a breaking device that keeps the rod from moving to consider the. the crystals, 3 ill.

The invention relates to the oil and gas industry, in particular to a hydraulic Assam double action designed to free stuck in a wellbore equipment during the drilling and testing of the seams.

Known hydraulic Iasi with automatic direction changing shocks on stuck pipe, comprising a housing with annular recesses on the inner surface, the plunger is spring-loaded piston, two rigidly connected with the rod sleeve, between which is placed a spring-loaded spool, on the outer surface between the ends of the sleeves has mentioned piston, while above and below the spool between the rod and bushings formed cavity, the upper of which is in communication with the annular space, and the lower internal cavity of the tube [1].

For this Yassa mode strikes down requires the creation of a pressure differential between the cavity of the pipe and the annular space, and is due to the additional energy consumption leads to increased mechanical stresses in the pipes and requires the installation of an additional pump with adjustable flow rate and the corresponding binding at the mouth of the SC is showing is made in the form of a cylinder, filled with the working fluid, and a hollow stem seals, connected to each other by the piston dividing the cylinder on nadporshnevaya and podporchennuyu cavity [2]. To prevent rotation of the node rods with the piston relative to the housing upper stem provided with a thrust with shaped outer surface that interacts with the response of the inner shaped surface of the housing. The inner surface of the cylinder is made stepwise, in places of transition from one step to another is made of longitudinal grooves. The piston has two bypass channels that have a counter included check valves and made nests under the adjustable throttling nozzle. Piston seal placed on the ring insert that is installed on the piston with limited radial movement. The insert in engagement with the longitudinal grooves of the cylinder prevents the ejection of the piston seals from the grooves when moving the last step of smaller diameter at the level of larger diameter.

This design is inherent in other serious disadvantages, namely:

1. The necessity of lifting Yassa on the surface and disassembly for changing the direction of the shock, since the switching osushestvlyaetsya piston due to their additional strain when moving the piston in the cylinder from one level larger diameter at the level of smaller diameter.

3. The occurrence of the additional mechanical stresses in the elements of the cylinder group from the action line and annular pressure due to the fact that in the hydraulic system Yassa not provided for their payment, and this leads to decrease in the reliability of the latter.

4. The possibility of triggering Yassa (in his inclusion in plasticmetal layout) in non-nominal mode, for example, when tightening the column, due to the lack of axial fixation of the stem in the body, to maintain a certain value of the tension pipe.

The invention solves the problem of creating hydraulic Yassa double action, which while preserving the positive characteristics considered hydromechanical Yassa would enable two-way impact on stuck in a wellbore equipment without rising to the surface, under more favorable conditions of work piston seals and other elements of the cylinder groups, and, when included in the composition plasticmetal layout would prevent uncontrolled operation in the absence of the tack.

The invention consists in that the hydraulic Yassa double action, containing a hollow cylindrical block him splined connection rod with a through axial channel and with the piston in the middle part, placed in the working cylinder and having a throttling channel connecting nadporshnevaya and podporchennuyu cavity of the working cylinder filled with hydraulic fluid, the annular separating piston, movably mounted above and below the working cylinder between the casing and the stem and the cut-off device, hold the rod from moving relative to the housing, and a working cylinder stroke length of the piston is formed inside the housing cylinder sleeve, in the middle of compacted relative to the housing, and on both sides of the seal forming with the casing an annular cavity, through the end gaps, indicated respectively with newportnews and podpornoy cavities of the working cylinder, and having in the wall on opposite sides of the seal through the radial holes.

When this cylinder sleeve mounted in the body mainly with the possibility of a limited axial displacement and limited tilt in any direction along the outer cylindrical surface about the point of contact between its seal with the frame.

In addition, the cut-off device made in the form of discontinuous differential bushings, topiramate for internal ledge corpcom, and the other with the body, and the contact between the end faces separating a discontinuous differential bushing from the in-line space.

In Fig.1, 2 shows a hydraulic Iasi dual-action, upper and lower parts, respectively; Fig.3 - section a-a in Fig.1.

Yass includes a hollow cylindrical body 1, for ease of manufacture and Assembly is made of a composite of several parts (separately in the drawing not labeled) connected between themselves by means of threads. The upper end of the housing is reinforced through internal ledge 2, the upper end of the body performs the function of an anvil to strike down, and the lower end surface of the projection function anvil to strike up. In the Central part of the body formed a working cylinder 3, and the lower part is equipped with nipple sub 4. Inside the housing telescopically mounted rod 5 with a through axial channel, the associated splined connection 6. To facilitate manufacture and Assembly, the shaft is also made of composite of several parts (separately in the drawing are not marked), interconnected by means of threads. The upper thickened portion of the stem has an outer protrusion 7, the upper end surface of which serves as the striker to strike the eye. In the middle part of the stem 5 has a piston 9, is placed in the working cylinder 3, which is the length of stroke of the piston is formed inside the housing 1 cylinder sleeve 10, in the middle of compacted relative to the housing through the seal 11, and on both sides of the seal forming with the casing an annular cavity 12 and 13, through the end gaps, indicated respectively with newportnews and podpornoy cavities of the working cylinder 3, and having in the wall on opposite sides of the seal through the radial holes 14 and 15. Piston rings 16 on the piston 9 are arranged so that their locks are evenly spaced around the circumference, resulting in gaps 17 in castles together with clearances between piston and cylinder liner to form a labyrinth that perform the function of throttling channel connecting nadporshnevaya and podporchennuyu cavity of the working cylinder 3, is filled with hydraulic fluid. From the annular line and space of the working cylinder 3 is insulated by an annular separating piston 18 and 19, movably installed respectively above and below the working cylinder between the housing 1 and the shaft 5. Due to this, in the process of drilling and testing of wells in Qili is(depending, which is more), resulting in a decrease of the voltage and decreases the likelihood of deformation of the elements of the cylinder group. To fill the cavities of the cylinder with hydraulic fluid, the housing 1 has openings closed by plugs 20. To reduce the likelihood bully cylinder liner 10 in the body 1 is installed with the possibility of a limited axial displacement and limited rotation about the point of contact between its seal 11 with the housing 1, through which the piston 9 with the cylindrical sleeve 10 have the opportunity to mutually samoustraniajutsia. To maintain the working bodies of the Yassa in the initial position in the absence of sticking and preventing uncontrolled operation it is equipped with a discontinuous sleeve 21 connecting the rod with the housing, the latter being provided with a rigidly connected therewith and in contact between the ends of the protective sleeve 22 and 23, which separates the tensile strength of the sleeve from in-line space and prevent the loss inside the tubing of its fragments.

Works currently as follows.

When the position of the working bodies shown in the drawing, and when filled with hydraulic fluid newportnews and podpornoy the cavity of the work on the drilling or testing operations. During normal drilling or well test Iasi remains in its original position due to the connection rod 5 from the housing 1 a discontinuous sleeve 21, which prevents its activation in non-nominal mode, for example, when tightening the pipe string. In the case of sticking the tool string of pipe stretch and destroy the tensile strength of the sleeve 21, while the protective sleeve 22 and 23 prevent the loss of its fragments into the column. After this sub 8 with the rod 5 and the piston 9 have the opportunity to move up relative to the body 1, which is held in place downstream tack equipment. On a plot of L1stem Assembly with piston moves with great speed, because the hydraulic fluid freely flows from newportnews cavity of the cylinder in his podporchennuyu cavity through the lower holes 15 in the cylinder liner 10 and the lower annular cavity 13. On a plot of L2the speed of movement of the rod with a piston is small, because the holes 15 is blocked by the piston 9 and the flow of fluid from the upper cavity of the cylinder at the bottom is only through the throttling channel in the piston 9 having a large hydraulic resistance. This allows you to increase the tension vysheraspolozhennom is a plot of L3and opens the top of the hole 14 of the cylinder liner 10, through which the hydraulic fluid flows freely from newportnews cavity, passing through the upper annular cavity 12, in podporchennuyu. The fluid pressure in newportnews cavity of the cylinder drops, the force holding the drill pipe in the stretched condition, becomes insignificant and the stem Assembly with the piston under the influence of elastic stretching of the drill pipe is suddenly moved to its extreme upper position, the piston rod 5 with its outer ledge 7 hits on the inner ledge 2 of the housing 1. This blow through body parts Yassa is transmitted downstream node equipment. If you stuck a piece of hardware is released, Iasi again transmit the compressive force (in the slow passage of the section L2when moving down), followed by its extension, as described above.

If necessary, strike down Iasi charge, moving the rod 5 up to the stop in the inner ledge 2 of the housing 1. Then the tool is unloaded, causing the piston moves down, quickly passing area L3because the hydraulic fluid from podpornoy cavity through the upper openings 14 and versti 14 cylinder liner 10 during its subsequent transfer to the plot of L2the hydraulic fluid in podpornoy cavity of the cylinder 3 is compressed, because the cavity above and below the piston are communicated only through the throttling channel in the piston, providing the flow of fluid great resistance. In podpornoy cavity creates a pressure proportional to the compressive force. The compressing force is accumulated in the form of energy of elastic deformation of the drill pipe. After the release of the piston 9 in the section L1and opening the lower hole 15 of the cylinder liner 10, the fluid pressure in podpornoy oral drops, since set its message newportnews cavity through these holes and the lower annular cavity 13. The piston is rapidly moved down, and the energy of elastic compression of the tubing is transformed into a shot of the lower end of the upper sub 8 on the upper end of the body 1. If necessary, the application of repeated blows down described operations are repeated, when the charging Yassa move the piston up on the section L2exercise at a moderate speed.

Cycle Yassa again to release stuck equipment.

In comparison with the prototype of the proposed Iasi has the following advantages:

1. To change the direction of the shots on what exactly to change the direction of external load on the rod.

2. Greater reliability and a longer service life due to better conditions of work of piston provided with no steps (sections of different diameters) in the cylinder on the length of stroke of the piston, the possibility of self piston in the cylinder due to mobility of cylinder liners in the body and lower mechanical stresses due to the equal pressures acting on the cylinder sleeve inside and out, and also thanks to compensate for external pressure use to seal the cylinder from the pipe and the annulus movable separating piston.

3. When used in the composition plasticmetal layout, exception inadvertent operation at off-design mode by fixing the axial position of the rod in the housing through captive discontinuous sleeve.

Sources of information

1. USSR author's certificate No. 655812, IPC E 21 In 23/00, 1979.

2. Patent RU No. 2145659, IPC E 21 In 31/113, 2000 (prototype).

Claims

1. Hydraulic Iasi double action, including a hollow cylindrical body, in the middle part of which is formed a working cylinder telescopically mounted wadmedani in the working cylinder and having a throttling channel, connecting nadporshnevaya and podporchennuyu cavity of the working cylinder filled with hydraulic fluid, the annular separating piston, movably mounted above and below the working cylinder between the housing and shaft, and the cut-off device, hold the rod from moving relative to the housing, characterized in that the working cylinder to the stroke length of the piston is formed inside the housing cylinder sleeve, in the middle of compacted relative to the housing, and on both sides of the seal forming with the casing an annular cavity, through the end gaps are communicated respectively with newportnews and podpornoy cavities of the working cylinder, and having in the wall on opposite sides of the seal through the radial holes.

2. Hydraulic Iasi under item 1, characterized in that the cylinder liner is installed in the housing with the possibility of a limited axial displacement and tilt in any direction along the outer cylindrical surface about the point of contact between its seal with the frame.

3. Hydraulic Iasi under item 1 or 2, characterized in that the breaking device made in the form of discontinuous differential bushings, topiramate for internal octupling sleeve, and the other with the casing and the contact between the end faces separating a discontinuous differential bushing from the in-line space.

 

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