Hydraulic jar

FIELD: oil production industry, particularly for underground well repair to release stuck tool.

SUBSTANCE: device comprises cylinder having bored portion, cylinder, piston connected to traction and compensating rods and sealed with gaskets. Device also has bush with outer flat installed over the piston on compensating rod. The bush and piston end define annular gap with slot-like channel formed in bottom thereof. The device also has valve unit with shutoff member arranged in the annular gap and made as O-ring of elastomeric material. The shutoff member closes liquid flow directed from cavity located above the piston to cavity under the piston. The piston is spaced from the cylinder. Channel, which communicate cylinder cavities divided with piston, is made as annular space between compensating rod and piston and may be connected with slot-like channel.

EFFECT: simplified structure and increased reliability.

2 dwg

 

The invention relates to the oil and gas industry and is intended for use in underground (capital) repair of wells to free stuck tools and equipment blows.

Known hydraulic Iasi, which contain the cylinder associated with the released object and filled with the working fluid. The cylinder is placed a piston, through which the piston rod is connected with the working of the column of pipes, and the input shaft in the cylinder is sealed by a stuffing box. To create impact with this Assam tension pipe string load piston, which compresses the working fluid in the cylinder above it. Moreover, as a result of leakage of the working fluid through a couple of "cylinder-piston" last moves up and reaches in the cylinder bore to a larger diameter section. As a result, this plot the movement of the piston occurs without pressure drop, which stretched (deformed) working column is dramatically reduced under the action of elastic forces and the piston hits the top of the cylinder [1].

The disadvantage of this design is the low efficiency, due to the fact that a pair of piston-cylinder have to perform a significant gap, otherwise return the piston to its original position becomes difficult, resulting in such Iasi mo which should be operated only at relatively low differential pressure on the piston during upward which limits the deformation of the column, and hence the force of the blow.

In more modern designs of jars this disadvantage is overcome by the fact that a pair of "piston-cylinder" at the site of loading pressure drop well sealed, and the return of the piston in the original (lower) position is provided by passing the working fluid up through the valve, channels and throttling gaps [2].

The specified hydraulic Iasi contains a cylinder made with the bore section in which movably mounted a piston connected to the traction and the compensating rods, which are sealed by seals. To the piston through the top of the traction rod attached to the main column, at the bottom of the piston is auxiliary compensation stock for the permanence of the working volume of the cavity of the cylinder during movement of the traction rod. The cylinder is attached to a freed object.

Design features specified Yassa are those that the outer surface of the piston forms a tight pair of movable relative to the cylinder, the piston is made of a composite and includes an annular casing with perforated holes and filters, discs located between the bushings with longitudinal channels and with spiral grooves on the end surfaces. Between filters and dis is AMI are liners, on the inner surface of which is made of spiral grooves forming together with the spiral grooves of the sleeves, the longitudinal channels of the sleeves and the annular throttling gap disks and casing unified throttling the working fluid.

This design allows the above fundamental lack of similar, but also has some drawbacks, the main ones being the following:

- the complexity of the design of the piston;

- unified throttling the working fluid is sensitive to contamination, because even small unwanted particle may disrupt Yassa. This disadvantage is partially overcome by the use of high purity fluid and filter, which complicates the design of Yassa, at the same time, the inevitable contamination of the working fluid during operation of the products of wear of friction pairs still reduces the uptime Yassa.

The aim of the invention is to simplify the design and increase the reliability of your hydraulic Yassa.

This objective is achieved in that the channel that tells the cavity of the cylinder separated by the piston and filled with the working fluid, supplied installed above the piston on the compensating shaft sleeve with outer chamfer forming together with the end face of the piston ring groove, the bottom of which is made slotted channel, valve hub with a locking element in the form located in the ring groove o-ring elastomer to shut off the flow of fluid from the cavity above the piston in the cavity under the piston, while the piston is installed with a clearance relative to the cylinder, channel, informing the cavity of the cylinder separated by the piston, made in the form of an annular gap between the compensation rod and piston with messages with a slit channel.

On the issue regarding the conformity of the differences described the development of the criterion of "inventive step" reported the following.

Perform valve block with shut-off element in the form located in the ring groove o-ring elastomer makes the design Yassa much less sensitive to the content of mechanical impurities in the working fluid, since the latter in the case of penetration into the ring in most cases simply sink into the body of the ring, without breaking the integrity of the pair. As mentioned above, this property does not have a piston and unified throttling the working fluid of the prototype - mechanical inclusions can lead to a denial of the Yassa.

The above, in our opinion, shows that the proposed Iasi combines the advantages of analog and prototype, being free from their main drawbacks. In addition, to the available sources unknown to us design Yassa, equivalent proposed design. For these reasons, in our opinion, the proposal may be deemed to be the relevant criterion of "inventive step".

The drawing shows the proposed Yass. 1 shows a longitudinal section of the device; figure 2 shows the node cut-off flow - return valve in a larger view.

Yass consists of a cylinder 1 with the bore area, which with a small clearance relative to the cylinder 1 movably mounted on the piston 2. The traction rod 3 is sealed by the upper seal 4 and connected with the spindle 5, which housing 6 Yassa mated pair of slotted 7. The spindle 5 is connected with the working column pipe 8, and the spindle is made head 5g to strike to the body 6 Yassa. The compensation shaft 9 below the piston 2, sealed bottom seal 10 that is installed in the lower sub 11. Between the compensating rod 9 and the piston 2 has the annular gap 12. Above the piston 2 is located for axial movement relative to the compensation of the rod 9, the sleeve 13, which is made of the outer chamfer 14. In the annular groove formed by the chamfer 14 of the sleeve 13 and the end face of the piston 2, there is a sealing O-ring 15 of elastomer. The specified annular groove through the slotted channel 16 is in communication with the annular gap 12, which in turn is hydraulically connected to the backwater is newim space through the slots 17 are made in the rod 9.

The operation of the device is as follows.

When working tension pipe string 8 spindle 5, the rods 3 and 9 together with the piston 2 moves upward. While in the cavity b of the cylinder 1 above the piston 2 increases the pressure under which the sealing O-ring 15 of the elastomer adjacent to delavau channel 16 and overlap, preventing the flow of working fluid from the cavity Into the cavity H under the piston 2 of the cylinder 1. This differential acting on the annular area of the piston 2, places the burden on the working column 8. Further, the leakage through the gap in the plunger 2 to the cylinder 1, the piston moves up the bore area of the cylinder, where the pressure differential is removed. Then stretched the main column is dramatically reduced, resulting in the blow head 5g spindle 5 on the inner end of the body 6. Slotted pair 7 allows you to pass through Yass torque.

During the return of the moving parts Yassa in the original (lower) position, which corresponds to figure 1, after the entrance of the piston in the lower part of the bore of the cylinder 1, the piston 2 closes the cross section of the cylinder 1. Therefore, under the piston 2 increases the pressure which, acting through the slots 17, the annular gap 12 and the slotted channel 16 leads to increased pressure sealing O-ring 15 of elastomer. Under this influence on the effect of the sealing O-ring 15 a few stretches and rises in its groove. Due to the chamfer 14 between the sealing O-ring 15 and the sleeve 13 is formed an annular gap through which the working fluid from the cavity H flows into the cavity In the cylinder 1, allowing the piston 2 to move down the cylinder 1.

Is of practical interest is the question about the required width of the gap junction channel 16, as for wide o-ring 15 can be pressed into a slit channel 16 pressure drop, and with a small width is unacceptable increase in pressure drop during the movement of the piston 2 down. Evaluate these quantities for Yassa with an outer diameter 095 mm, i.e. for one of the most typical representatives of repair jars.

Let us put a slit width of 0.2 mm, which is quite acceptable for the integrity of the rubber o rings with a diameter of 5.8 mm body (standard cross-section according to GOST 9833-76) of hard rubber in all practically occurring loads (and hence the differential pressure on the piston Yassa [3].

For this Yassa outer diameter 95 mm length of the o-ring groove 15 of the design considerations will be the bottom about 52 mm × π=163 mm May be 1/4 of this value is left on the tabs on the end of sleeve 13, which define (support) the width of the gap junction channel 16. Then clean the crack will be 163 mm × (1-0,25)=123 mm Square is the area of the lumen of the slit will be 123 mm × 0.2 mm = 24.6 mm2≈ 0.25 cm2.

On the other hand, the area of the piston 2 of this Yassa is from design considerations about 26 cm2. Taking the speed of the landing of the piston about 10 cm/sec, the flow of liquid through the gap is 10 cm/sec × 26 cm2=260 cm3/s.

At this flow rate the flow rate through the gap will be

where 0,8 - speed ratio.

The pressure drop will be in metres:

Let as working fluid Yassa used mineral oil with a density of 900 kg/m3then when it flows through the gap difference is less than 1 atmosphere. Preliminary calculations for viscous losses give a figure of the same order. Thus the proposed shutoff of steam to the piston 2 Yassa has practical pressure loss of not more than (2÷5) ATM. On the area of the piston 26 cm2this differential creates a force of not more than 26×5=130 kg, which is approximately equal to the weight of one drill pipe with a diameter of 73 mm

In conclusion, we report on the prospects of use of the invention.

As you know, recently there has been the growth of oil production in the country. This is achieved, among other measures and intensive repair works in the wells with the purpose of entering them in the work of inactivity. Such restoration and repair slave who you are in the vast majority of cases require extraction from faces left earlier in the wells of various types of faulty equipment - packers, pumps, etc. In this regard hydraulic Iasi, which is an effective tool release are taken from the well equipment will be used more and more wide application in the practice of repairs.

Literature

1. Gcamp. Fishing in oil-wells. M.: Nedra, 1990, p.34.

2. Patent SU 1700196, 1991, 4 S.

3. Timbuktu. Engineering hydraulics. The Handbook. Moscow: Mashinostroenie, 1971

Hydraulic Iasi, comprising performed with the bore area of the cylinder, a piston connected with the traction and the compensating rods, sealed by seals, channel, informing the cavity of the cylinder separated by the piston and filled with the working fluid, characterized in that it has installed over on the compensating piston rod sleeve with outer chamfer forming together with the end face of the piston ring groove, the bottom of which is a slotted channel, valve hub with a locking element in the form located in the ring groove o-ring elastomer to shut off the flow of fluid from the cavity above the piston in the cavity under the piston, with the piston is installed with a clearance relative to the cylinder, channel, informing the cavity of the cylinder separated by the piston, made in the form of an annular gap between the compensation rod and Porsche who eat with messages with a slit channel.



 

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