Borehole hydraulic jack

FIELD: oil and gas industry, particularly for freeing stuck downhole equipment.

SUBSTANCE: device comprises at least two hydraulic power cylinders, hydraulic anchor, overflow circulation valve having body connected to anchor body by means of shear pins and hollow stem connected to fishing string. Hydraulic separators having floating gaskets are installed between hydraulic power cylinders, as well as between anchor and hydraulic power cylinder. One hydraulic power cylinder comprises spring-loaded piston and consists of two cylinders provided with threads. Pistons of all hydraulic power cylinders have annular sealing means and annular groove for lubricant receiving. Orifices, which communicate hollow stem interior with hydraulic power cylinder and anchor interiors, are created in front of each hydraulic power cylinder and hydraulic anchor inside hollow stem. Orifices located in front of hydraulic power cylinders have diameters less than that of orifices formed in front of hydraulic anchors. Lower stem part is provided with seat for free-falling sealing ball receiving and connecting tread for fishing tool connection. Lower stem part is connected to valve body.

EFFECT: simplified structure along with technical capability retention.

1 dwg

 

The invention relates to the oil and gas industry and can be used when extracting from a cased wellbore disaster stuck downhole equipment.

Known downhole hydraulic Jack consisting of the power cylinders and hydrocore (Vahrukov. Overhaul of oil and gas wells. - M., Nedra, 1969, str. Thematic scientific and technical review series "Drilling", VNIIEM, 1977, p.10).

The main disadvantage of these devices is the lack of a rigid connection rod of the Jack with the fishing string and a fishing tool that does not allow them to transfer the force from the lifting installation on the stuck object. This fact makes it necessary to include in the design of hydraulic cylinder for more power cylinders increasing its size and complicating the technology of repair work.

Famous deep gidrotartrat to eliminate sticking (patent RU 2190080, C2, E 21 In 31/006, 27.09.2002,), in which case the power cylinders connected to the hydraulic anchor, and the barrel of the hydraulic cylinder is connected directly with the fishing string and a fishing tool (prototype).

A disadvantage of this device is that to recharge it in the hole, to fill the internal cavity of the fishing columns when running in the hole for the using serial enable hydraulic anchor and power cylinders are complex mechanical devices, the need for adjustment, which increases the size and complicating the maintenance of the hydraulic cylinder. Additionally, when you reload it in the hole you want to create excess pressure in the annulus, which cannot be done by leaks in the casing or in the presence of messages wells reservoir.

The aim of the present invention is to simplify the design of the hydraulic cylinder while maintaining its technical and technological capabilities.

This goal is achieved by the fact that gidrotartrat containing two or more power cylinders, the anchor, the housing of which is connected to the housing of the power cylinders bypass circulation valve, and a hollow barrel of the hydraulic cylinder directly connected with the fishing string, wherein one of the power cylinders of the hydraulic cylinder is equipped with a spring-loaded piston and consists of two cylinders connected by a thread, and all pistons of the power cylinders are provided with an annular sealing ring and a cavity for placement of the lubrication of the inner surface of the power cylinders, and hydraulic separators are equipped with floating seals, in addition, against each of the power cylinder and anchor in the hollow barrel of the hydraulic cylinder are holes, informing the cavity of the trunk cavity ilovegerardo and anchors, moreover, the diameter of the holes against the force of the cylinders is less than the diameter of the hole against the anchor, in the lower part of the hollow barrel of the hydraulic cylinder has a saddle bargain locking ball and mounting thread for fishing tool, and its upper part is connected to the housing by-pass valve in which there is a thread for attaching a fishing column, in this case the by-pass valve connected to the housing of the hydraulic anchor with shear pins.

The drawing shows the construction of the downhole hydraulic cylinder.

The layout of the hydraulic cylinder includes the following main elements: - pass circulation valve 1 with mounting thread for fishing column, which is threaded joint is rigidly connected to the hollow shaft 2 and the housing of the hydraulic anchor 3 using shear pins 4. In the lower part of the hydraulic anchor there is a thread with which it is connected to the housing of the power cylinder 5 and separated from it by a hydraulic separator floating seal 6. The internal cavity of the anchor is hydraulically connected with the cavity of the hollow piston rod of the hydraulic cylinder through the opening 7. The pistons of the power cylinders 8 and 16 with the ring 9 is connected by a threaded connection with the hollow shaft 2 and are provided with an annular cavity 10 for placing the lubricant is I. The inner cavity of the power cylinders are connected with the cavity of the hollow shaft 2 through the holes 11, the diameter of which is less than the diameter of the hole 7 and the annular space holes 12. In the layout of the hydraulic cylinder included power cylinder, which consists of the top 13 and bottom 14 of the cylinder, connected by threads 15. Inside this cylinder is placed a piston 16, a preloaded spring 17, and the bottom it is connected with a nut 18, which is equipped with o-rings and has an annular groove 19 for accommodating lubricant hollow rod 2, having in the lower part of the saddle 20 for the bargain locking ball and thread for attaching a fishing tool.

Well gidrotartrat works as follows. Before descending into the well, when the Assembly, in its layout includes a power cylinder, consisting of the top 13 and bottom 14 of the cylinder, connected by a thread 15, which perform senegalian spring 17, which podruzamevaet the piston 16. To the lower part of the hollow barrel of the hydraulic cylinder is connected fishing tool and using thread-pass valve 1 is attached to it fishing column, which lowered him into the hole. This results in the rigid connection between the fishing string and a fishing tool through the bypass valve 1 and the hollow shaft 2. Therefore, fishing is the instrument can be transmitted compressive, tensile forces, torque, axial displacement. Then make stretch fishing columns within the technical capabilities of the hoisting unit, throw in a fishing column locking ball and create it excessive pressure, resulting in the following: as the opening 7 more holes 11, first forward and rest against the wall of the casing crackers hydraulic anchor 3, then move the pistons 8 and 16 of the power cylinders 5 and 14. Because between them is the hydraulic separator with a floating seal, then their efforts are formed, and the floating seal eliminates the possibility of jamming of the hollow shaft 2, due to the possible misalignment of the parts of the cylinders, so it moves with minimal friction. With the hollow barrel 2 is moved down and is rigidly connected pistons 8 and 16 and placed in the cavity 10 of these pistons grease lubricates the inner surface of the power cylinder 5 and cylinder 14, and the lubricant in the cavity 19 of the nut 18 lubricates the outer surface of the lower part of the hollow shaft 2. As a result, it also reduces the friction during the movement of the trunk. As the case of cylinders fixed relative to the casing hydraulic anchor 3, the force arising in the hydraulic cylinder, is added to the tensioning force on the fishing string to the pubic and transmitted to the fishing tool. When moving the stuck object is cut pin 4 and the hollow shaft together with a by-pass valve moves up, causing the piston 16 compresses the spring 17, the housing of the power cylinder remains stationary. This action is observed on the surface of the indication of the weight of the fishing string. Then reduce the fishing pressure in the column, resulting in a retracted crackers hydraulic anchor and under the action of the spring 17 gidrotartrat automatically returns to its original position. Then try to raise privacey object. If it is to climb the impossible effort of a hoist, the newly create excessive pressure in the extractor column and the process is repeated the necessary number of times. When it becomes possible rise of the stuck object without the aid of hydraulic jacks, throw shut-off ball of larger diameter, open circulation holes bypass valve and continue the ascent.

Thus, the inclusion in the design of a hydraulic cylinder of a cylinder with a spring-loaded piston is allowed to solve the problem of its recharge in the well. However, it has become possible through the use of pistons with o-ring seals, the longitudinal displacement which requires much less effort compared to the lip seal, which is applied from the local structures of hydraulic jacks. Grease the inner surface of the housings of the cylinders helps to reduce friction ring seals on the casing wall of the cylinders and reduces corrosive wear. To reduce the efforts of the movement of the pistons also promotes the use of floating seals in hydraulic separators, which neutralize the possible misalignment of parts of the hydraulic cylinder. The presence of the hollow piston rod of the hydraulic cylinder of different diameter solves the problem of priority include hydraulic anchor and power cylinders. Furthermore, a power cylinder with a spring-loaded piston, costsi of two parts, allows senegalian springs without the use of special power devices.

All this makes the design of the downhole hydraulic cylinder compact, and technology of its application is simple and applicable in all conditions repaired well.

Well gidrotartrat, the descent on fishing the tubing or drill pipe in the well containing at least two power cylinder, hydraulic anchor, the housing of which is connected to the housing of the power cylinders, the bypass circulation valve, a hollow stem connected with the fishing string, characterized in that it is equipped with a hydraulic separator with floating seals, set the run between the hydraulic power cylinders, and between the hydraulic anchor and hydraulic power cylinder, one of the power cylinders are equipped with a spring-loaded piston and consists of two cylinders connected by a thread, and all pistons of the power cylinders are provided with an annular sealing ring and a cavity for placement of the lubrication of the inner surface of the power cylinders next to each power cylinder and hydraulic anchors in hollow barrel with holes, indicating its cavity with the cavity of the power cylinders and hydraulic anchor, and the diameter of the holes in front of the power cylinders is less than the diameter of the holes opposite the hydraulic anchor, in the lower part of the hollow barrel has a saddle bargain locking ball and mounting thread for fishing tool, and its upper part is connected to the housing by-pass circulation valve in which there is a thread for attaching a fishing column, in this case the bypass circulation valve connected to the housing of the hydraulic anchor with shear pins.



 

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