JPS6095196A - Method for fabricating hollow pipe having suction lever, connector of suction lever and connection end and apparatus for utilizing suction lever in sucking oil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to various improvements in methods of manufacturing or using suction rods. One application of such improvements is in the suction rods used in the oil industry, and in particular in the wave-braked pumping of oil. However, the application is not limited to such things.

According to one aspect of the present invention, a plurality of hollow suction rods (lO) and a connecting means (lO) for connecting each of two adjacent suction rods are provided.
1) is provided with a suction rod series for a fluid brake pump, said series means (11) being hollow and having sealing means (
16), whereby the inside of the suction rod (10) can communicate and is set at a pressure different from the pressure outside the suction rod (10).

According to another aspect of the invention, there is provided a connector (11) for the suction rod (10), the connector (11) being entirely hollow and cylindrical and engaging the suction rod (10) at least at the l end. (12) and a suction rod (l) connected to the connecting means.
and sealing means (16) for sealing between the inside of the suction rod (10) and the outside of the suction rod (10).

According to another aspect of the invention, the connector for the rod (10) (
24) is provided, which connector (24) comprises two substantially identical female ends (39), each of which has internal coupling means (33) of the rod (10) connected by the connector (24). external coupling means (32) adapted to cooperate with the external coupling means (32) are provided.

According to yet another aspect of the invention, two bonded unisol l-
(25), drilling or introducing an axial hole (17) along the longitudinal direction of each coupling unit (25), providing a tube (10) of the required dimensions, l
We give a method for making a bonded terminated hollow tube (10) consisting of the procedure of friction welding each end of O) to each one of the bonded unibody tubes (25) with perforations.

According to another aspect of the invention, there is provided a suction rod series (1) comprising a plurality of suction rods at least at its lower end, each of these suction rods being between any two of said plurality of suction rods. The inner hole (17) has a diameter longer than that of the inner hole for connection.

According to another aspect of the invention, a sump downhole (do
wn hole) is provided with an apparatus for use in pumping oil consisting of a sump closed downhole of gas compressed to a pressure at least equal to the pressure of the down-ball interface. . The sump allows oil to be drawn in during the pump pump stroke, thereby compressing the gas in the sump and providing wave-braked pumping.

According to yet another aspect of the invention, suction rod series - (1)
A connector is provided having one end adapted to mate with the connector (
The compressed gas constitutes a connector prior to the suction rod series (1) connected to (85).

The present invention relates to a number of improvements in the -fQ area of rod manufacturing and utilization. One suitable but non-limiting application for this improvement is for suction rods used in the oil industry, particularly for wave-damped pumping of oil.

It is well known that the vast majority of oil fields created are operated by some type of artificial lift. In this case, 90% of the suction rod is 31) pumped.
Ru. This is an extremely simple system and has relatively few accidents. The system consists of an upright valve near the bottom of the drilled hole, a running valve and a plunger connected to the suction rod connection. A making beam or other surface pumping unit connected to the top of the suction rod train moves the traveling valve toward and away from the upright valve. However, when the wave nature of the operation is repeatedly applied to the suction rod, fatigue accidents may occur. Since the length of the suction rod is several thousand feet, the forces exerted on it are multiplied and the wave motion generates significant forces due to the different elastic deformations of the pipe and fluid. Changes in the velocity of the oil also cause changes in pressure, and as the oil moves, it creates pressure waves that are reflected at the end of the pipe until the force is completely reduced by friction and absorption.

All of the above may lead to an accident in one or more of the suction rods, and the deterioration of the situation will lead to higher costs. Repairing the suction rod requires shutting down production of the well, thus resulting in production losses.

In order to overcome the above-mentioned difficulties and to prolong the life of the suction rod, the use of hollow suction rods filled with compressed inert gas or air has been proposed. The interface between the gas and the fluid is close to the suction rod running valve and the pressure can be dissipated by the oil moving upwardly inside the hollow suction rod.

When the stress on the suction rod is reduced, the elastic deformation of the rod decreases,
The travel valve extends the travel distance in response to the stroke of the oil field hend pump, and the oil flow rate increases significantly. It goes without saying that the life of the suction rod will also be extended.

Apart from the rods used in the wave-braking pumping procedure described above, hollow suction rods are well known for injecting heavy oil diluents and are used to add preservative oils to corrosive oils. . In these two known cases, the I1 additive is pressurized to such an extent that the rising oil does not exert any force on the interior of the suction rod. Under these circumstances, the leakage from the hollow suction rod is not too much! Leakage is less likely to occur at this pressure]J, not p'. However, in the braking pumping method against wave motion, the pressure inside the hollow suction culm is
＼、Q、'Imonodena &JReponadzu', the weak bond between the suction culms and problematic leakage are the drawbacks.

It is an object of one aspect of the invention to overcome the above-mentioned disadvantages and to provide a suction rod and connector for forming a suction rod reception array useful for wave damping pumping.

According to a first aspect of the present invention, a suction rod series for braking and pumping of fluid is arranged, which comprises a plurality of hollow suction rods and the same number of connecting means for connecting each of two adjacent suction rods, and the connecting means is hollow and is provided with sealing means, whereby the interior of the suction rod is in communication and is at a pressure different from the pressure outside the suction rod.

In an embodiment of this aspect of the invention, the respective coupling means are connected to the suction rod such that each suction rod has a coupling means at one end thereof and means for engaging a second coupling means at the other end. It is one with each one.

In contrast, each coupling means has a housing adapted to mate with the respective ends of two adjacent suction rods.

In another embodiment, the coupling means is a "pin-to-pin" connector and the end of the suction rod is a corresponding "box".

Each suction rod is engaged with its corresponding coupling means by interlocking stud means.

The sealing means is preferably a seal made of glass-reinforced PTPli (polytetrafluoroethylene).

In a preferred embodiment of this aspect of the invention, the coupling means is a housing that is longer than the dimensions of the two parts of the suction rod adapted to fit within the housing and occupies the space between the ends of two adjacent suction rods. It is also a means of sealing.

A metal casing is provided to effectively maintain the sealing means. Additionally, a shoulder is provided at the intermediate internal point of the coupling means, against which the seal rests.

The seal is arranged to join within screw means connecting the coupling means to each of the two suction rods engaged therein. Additionally, the seal is held by each shoulder of the suction rod and abuts the end face of the coupling means.

According to a second aspect of the invention, there is provided a connector for the suction rod, the connector being generally hollow and cylindrical and comprising means for engaging the suction rod at at least one end, said connecting means A sealing means is provided between the inside of the suction pipe connected to the suction rod and the outside of the suction rod.

Preferably, the sealing means is a glass ring tube filled with PTFE.

The shape and predetermined location of the sealing means is fluid.

As mentioned above, the procedure for pumping oil from an oil field involves connecting the down-pole plunger and the oil field head pumping a.
U must. This connection is accomplished by a series of suction rods connected together to achieve the required length. Because these trains can be several thousand feet long, the connections must be strong enough to withstand the weight of the train, the weight of the oil being pumped, and the conditions of the suction rod during the pumping operation. It is important that the material can sufficiently withstand repeated stress when placed in the environment. The connection between the suction rods is usually by interlocking screw means, - first on the outside of the male member, called the pin, and - finally, on the inside of the female member, called the box. used.

The suction rods are provided with pin couplings at each end and are connected by generally cylindrical hollow couplings which in effect form a double box. These suffer from one disadvantage, which is that the suction rod is hollow for use in wave-brake pumping procedures.

The first disadvantage is that longer tubes are placed under greater tensile stress than shorter connectors. This loosens the screw means on the outside of the tube and on the inside of the connector.

A second disadvantage is that the outside diameter of the suction rod is limited, and in some proposals it is desirable to make the inside diameter of the tube as long as possible, as explained with respect to other aspects of the invention. This of course results in an increase in the outside diameter, and if this were screwed into the box connector for connection, the diameter of the box would also increase.

It is an object of one aspect of the invention to overcome the above-mentioned disadvantages and to provide a connector for rods, in particular for suction rods.

According to one aspect of the invention, a connector for the rod is provided;
The connector has two substantially identical opposing ends, each of which includes external coupling means adapted to interlock with the internal coupling means of the rods connected by the connector.

The device is disadvantageous because the long tube will have internal threads that interlock with the external threads of the short connector.

The tensile stress therefore tends to tighten the screw means.

The device is also disadvantageous because it allows box connectors to be constructed and fitted onto long outer diameter tubes.

Preferably each of the coupling means is a threaded means.

Preferably, the connector has an axial hole extending from one of the ends to the other end.

The middle part of the connector consists of a spanner flat and an elevator shoulder.

The 1.1 means are provided in abutment between each end of the connector and each end portion of the rod connected thereto.

This dense ↑・1 means forms part of another aspect of the invention.

The hollow rod mentioned above is particularly but not exclusively used for crude oil production +
From 11 onwards, it has been used as a suction rod for pumping up oil using wave braking. l-Losob Fawn.

It is known to construct solid bar stock as a coupling means for use with suction rods. Generally the rods are joined by cooperating screw means, one on the bl member, which is a pin, and the other on the female member, which is a box. It is clear from British Patent Application No. 8125760 that the solid rod end is 17 friction welded to a solid rod to form the suction rod.

It is also obvious how to form the joint ends by mechanically welding the bar stock to the rod or by welding them to the rod. However, the machining process is wasteful and especially complex when grinding flats. In any case, the generated combination means is not very strong (and also weak) as a creative combination means.

It is an object of the present invention to provide a method of making a bonded terminated hollow tube that rectifies these drawbacks.

According to one aspect of the invention, two coupling units are created and an axial perforation is provided or introduced along the length of each of the coupling units to provide a tube of the required dimensions, and each end of the tube is Each one of the coupling units has a hole drilled in the section.
Provided is a method for making a joint-terminated hollow tube consisting of a thick friction welding procedure. After the friction welding procedure, another procedure is performed to remove flash from the weld. Each or one of the internal and external flashes is removed.

Prior to the friction welding procedure, there is another separate procedure to upset the forging of the end of the tube.

Besides, the friction welding procedure itself forms the necessary upsets at both ends of the tube.

The joining unit is provided with respective screw means and is carried out in a convenient step of the process. In particular, a cutting procedure is included as the final step.

As previously mentioned, a problem with suction rod pumping is that movement of the sluice causes pressure changes that create stresses in the suction rod.

The suction rod is subjected to mechanical movements, generating repeated stress, which actually causes fatigue accidents. Due to the increase in pressure caused by the movement of oil, the speed decreases.
Against rL/sac! ], (HIOl bs/sq,
Each time the pressure applied to the interface between ft of gas and oil is increased. The wave damping process relieves this pressure by filling the hollow suction rod connection with compressed gas or air.

The tube approaches the plunger and is opened. In other words, it is in contact with the interface between gas and oil. The increased pressure is caused by oil flowing into the area where the hollow suction rod is moved to the upper blade when the pressure is increased, and also by the oil flowing out when the pressure is reduced or normal pressure again. The increased pressure is transferred to the top of the oil in the suction rod,
Its height is proportional to the pressure difference. In some cases, oil
It is desirable to lower the F section.

It is an object of one aspect of the present invention to provide a means by which low F oil tops can be achieved.

According to one aspect of the present invention, each of the plurality of suction rods has an internal hole in at least the lower part, the diameter of which is longer than the diameter of the internal bore of any two connecting means of the plurality of suction rods. A series of suction rods consisting of suction rods is provided.

The connecting means has a borehole of a normal diameter, and each of the rods has a borehole of at least twice the diameter.

The connector can also be of the pin-to-pin type forming another aspect of the invention. The pin-to-pin type connectors each mate with the interior of an enlarged hole in a corresponding suction rod formed as a conventional box.

Additionally, the inner diameter of each suction rod unit can be designed to be interlocking at the neck in the region of the connection.

The reservoir through which the oil passes through the enlarged diameter hole is formed by a member attached to the lower part. In use, its end is provided with a plurality of feed holes.

5 spaced apart at an angle but generally axially oriented
It is equipped with several oil supply holes.

The outer surface of the rod may be grooved or smooth. The grooved surface has the advantage of preventing upwardly mobile flow of oil if the enlarged diameter suction rod were not used in the enlarged space made available by the groove.

According to another aspect of the invention, a suction rod is provided for use in a suction rod connection according to the detailed described aspect of the invention.

It is clear that the hollow suction rod compressed with gas is used to brake the soaring pressure caused by the movement of oil in the production case, so that the oil level in the suction rod is at a point close to the interface in a stationary state. There is one.

When the suction rod starts its F stroke, the oil in the suction rod rises to its highest level. The oil in the suction rod will not be coated on its surface. However, in order to apply pressure inside the suction rod, the hollow tube must extend to the surface. This is a disadvantage since hollow rods are more expensive and generally heavier than solid suction culms.

The object of the present invention is to alleviate and eliminate the two disadvantages by providing a down-ball sealed reservoir system for an oil wave damping pump. It is something to do.

According to one aspect of the invention, prior to insertion of the gas reservoir down ball, when pumping oil, the oil is comprised of a gas reservoir surrounded by a down ball pressurized to a pressure at least equal to the +n force at the down ball interface. The equipment used is arranged and a gas reservoir is installed to allow oil to be sucked in during the pumping stroke, thereby compressing the gas in the gas reservoir and damping the waves. . The gas reservoir is pressurized and sealed at or before reaching the head of the well.

The seal is a solasovabr, a ball valve, or a stop valve activated by rotation of the suction rod train.

Advantageously, the pressure applying the sump is greater than the downhole interface pressure and less than the pressure produced during the suction rod amplifier stroke. The seal experiences an overwhelming force during the first amp stroke and the pressure in the IJ reservoir equals the interface pressure.

Once overwhelmed, the seal then remains uncoupled until the reservoir begins to function.

Alternatively, if the seal is a stop valve, it can be opened and closed freely by rotation of the suction rod series or other actuation.

During use, the sump is filled with fluid by a one-way valve located at the top end.

The sump consists of suction rods with a wide internal diameter, which suction rods form an aspect of the invention as described above.

According to another aspect of the invention, the upper end is adapted to be coupled to a suction rod series and the other end is adapted to be coupled to a suction rod forming part of a gas reservoir surrounded by a down ball of pressurized gas. and when the suction rod series is not connected to the connector,
A connector is provided comprising one-way valve means for filling the gas reservoir with pressurized gas.

The connector is of the box-to-box type (later a one-way valve means is housed in the neck section connecting the box coupler).

Examples of various aspects of the invention will now be described with illustrative reference to the 4=J diagram.

Referring now to FIG. 1 in particular, the operation of a wave damped pumping system is illustrated. The first figure shows the starting condition when the inside of the suction rod is pressurized by air, so that the interface between the oil and gas is at the bottom of hole 2 of the suction rod. Once set, the pressure at the oil/gas interface will remain the same.

FIG. 1b shows the system in an amplifier stroke when the sod bomb 3 raises the suction rod 1 and thus raises the travel rod t4 to the oil well. This lowers the pressure under the running jt and the oil flows through the upright valve 5 into the lower chamber defined by the valve. The flow of oil is shown by an arrow and is bent toward the upper blade at -n4.

As soon as the oil starts moving, its pressure will drop.

The low pressure is transferred at a considerable velocity through the column of oil, reflected from the open end of the production tube, and sent back out into the plunge. Due to the increased pressure created by this,
ζ approx. 9.0001 for a change in speed lft/sec
Generates a pressure force of 1+s/sq, fL. JIG great pressure is applied to the oil/gas interface of the suction culm and the gas compresses the hollow suction. This reduces the pressure in the oil production pipes.

FIG. 1C shows a top dead center system where the suction rod contains the maximum amount of oil.

Gases are in their most compressed state.

The down stroke is shown in Figure 1d.

The upright valve is closed by downward pressure, and the running valve opens to allow oil to flow into the plunger 6 from the chamber 41. The fluid pressure at the bottom of the suction culm chamber is higher than the pressure in the adjacent oil production pipe, at least up to the level of the oil in the suction rod. Thus, oil flows from the suction rod into the oil production pipe. This is the 1st e
The plunger continues as indicated by the arrow until it reaches the bottom dead center as shown. At this time, the oil/gas interface is at the heath of the suction rod series.

During the normal course of pumping, most of the oil
Only the oil supplied during the stroke, while the oil supplied during the downstroke, will be displaced by the volume of the rod that descends to a minimum degree of oil.

As mentioned above, the entire amount of oil that moves into the hollow suction rod during the amplifier stroke η is emitted from it during the downstroke and flows out of the well.

FIG. 2 shows the squeezing means 12 with which the suction rod 10 cooperates.
The two above-mentioned suction rods 1O are shown jointly connected by a box-shaped coupler 11 when held by a box. The suction rod is a spanner flat 13. The elevator shoulder 147A and pin type coupler 15 form the whole in a well known manner. MDI (America)
According to the Petroleum Ti++ Institute standards, the ζS1 method measurement is generally carried out.

At the middle point inside the box coupler 11, a glass-filled P
An annular seal 16 of T F Ii is arranged. When the two suction culms lO are fixedly screwed to the box coupler 11, the seals 16 are in compression and are coupled together to prevent fluid or gas flow between the inside and outside of the suction culms. Instrument II has been adopted. The suction culm is provided with an internal hole 17, indicated by a chain dotted line, and is formed so that the seal does not collide with this hole. The materials that make up the seal are extremely resistant to food conditions, long-lasting, and dense J1. form l f-. It is resilient under the pressure required to screw the suction rod onto the connector.

Figure 3 shows a similar coupling arrangement but with an improved seal f1.
I have 1#. The reference numbers are the same as in FIG.

This embodiment of the seal is shown in more detail in Figures 4 and 5, where the seal is a glass-filled prpp (7).
2 Tsu0J Ii Old Je J' l 11 (!: Gold 1.% 'J Sea 71/ -Holder 19 TeIf
f will be completed. The sole boulder 19 includes a ring for pushing the inside of the seal into the hole 17 and an O-
It is composed of a flange 20 that divides the ring 18.

In the embodiment shown in FIG. 6, two seals 16. The suction rod IO is arranged to be compressed within the screw means connected to the box connector 11. This modification is shown in Figures 7 and 8.
As shown in the figure, the seal 16 is located at the shoulder 2 of the suction rod.
1. Polishing the internal surface of the connector 22. Compression occurs between the inner wall of the connector and the exterior of pin 15. The embodiment shown in FIG. 7 provides an overlapping shoulder over the connector 11 to provide a better connection and seal.

FIG. 9 shows yet another embodiment in which the box connector 11 is formed with an internal shoulder 23 at its longitudinal midpoint, and an O-ring seal 16 is inserted into either side of the shoulder 23.

Since the shoulders do not effectively fill the space between the pin connectors 15 of the two suction rods 10, the seals 16 allow the seals 16 to be compressed into the shoulders when the suction rods are tightened with the connectors 11.

FIG. 1O shows an alternative arrangement in which connector 24 is a pin-to-pin type connector. This has 2 box parts on each end
It works in conjunction with a suction rod with 5. The sealing means should be as shown in this diagram! Although not shown, the internal shoulder may be placed within a box of the type shown in FIG. In order to provide a seal of the kind shown in Figs. 7 and 8), it is possible to provide a seal on the threaded means as shown in Fig. 6. should be obvious.

No. 111 W+ does not show a suction rod with a pin at one end and a box at the other end, as is commonly seen. box 25
In this case, it actually forms an internal joint, thereby eliminating the need to split the °ζ connector.

The box 25 can be friction welded to the η-shaped suction rod. Furthermore, the sealing means are arranged as just mentioned.

It is contemplated that other methods of fine IJ may be devised by the fine mfm of the present technique, and that these methods may be practiced within the scope of the present invention. Also, the materials constituting the sealing means may be varied to suit changing conditions. Apparently a special connection connects the suction rod series to the plant at the end of the downpole and connects the well.
＼You must connect it to the pump at the bottom end. However, these things can be changed depending on the situation.

Referring now to Figure 74'IO of Igl and Figures 12-14, a connector is shown having pins 31 formed by external threading means 32 on each of its opposite ends.

These are arranged to operate in cooperation with internal crimping means 33 which are arranged in a box 34 mounted on or formed on the ends of the rods to be connected b3.

Pin and box dimensions can vary, but generally eight pins
(American Petroleum Institute).

The connector shown in Fig. 12 is attached to the rod.
It has an intermediate portion 35 forged to a generally square cross section for co-operation with a wrench. This intermediate portion 35 is separated from each of the pins 31 by respective shoulders 36 adjacent the edges of the box 34 when the connector is screwed securely to the rod. The shoulder 36 is configured such that the shoulder protects the rod in the event of further wear.
It has an outer diameter longer than the diameter of the proximal suction rod.

The sealing means 37 may be arranged to cooperate between the connector and the rod when they are hollow to permit the passage of pressurized gas or fluid.

The connector in FIG. 13 has a middle portion 35 and a shoulder 36.
It differs from the connector shown in FIG. 12 only in that it includes an elevator shoulder 38 formed between the connector and one of the connectors.

The 21 connector shown in Figure 1θ has a wider diameter than the two embodiments described above. This connector prevents the suction rod connected to it from retracting from both sides of the hole, thereby preventing the
It works to prevent wear and tear. 1? ! This is particularly important if the anti-wear pad is placed at the midpoint of the suction rod, but the hole is not straight.

In this embodiment, the shoulder 36 is made long and the intermediate portion is forged with a spari flat 30.

Figure 14 is the same as the one shown in Figure 10. The connection means of ゛p is shown. Enough 111. that the box-type coupler can be formed without throwing the rod into one part.
There is a wall 01η) shown connected to the two rods.

The embodiments shown in FIGS. 10 and 12 to 14 all do not show an axially extending internal bore 39. A wealth of information has been provided in the application for a coupler that allows fluid to flow through the coupler from one hollow rod to the next. Shigashi,
As previously discussed, holes are not required when using solid rods. The holes 39 are retained to contribute to the weight reduction and to allow for the massing of the components, although this makes the connector more fragile than a solid one dimensioned accordingly.

The connector is described and illustrated as having a threaded connection with the proximal rod. This could, of course, be replaced by other forms, such as a hyonesoto part, a lug 1', or some pneumatically or hydraulically controlled releasable coupler.

The materials that make up the connector are designed to take advantage of this.
ζIt changes depending on the point of view. If the connector is used for an oil pumping suction rod, its material is 11+11 J%r
It probably depends on ll+. However, others may be available for specific purposes.

Although the expression "suction rod" is used in other ways than in this description, it is also used in this technique to refer to rods sometimes referred to as "bony rods" and "polisbed rods." This is what I am trying to do.

Referring to FIGS. 2, 3, 6-11, and 15 and 16 of FIG. 41, a hollow tube IO having the required length is shown. The end of the tube is formed with a hollow coupler, for example, either of pin type 2 as shown in Figs. 2 and 16, or of box type 3 as shown in Figs. 10 and 16. be done. Couplers are generally standard as they join other couplers, are marked with acceptable dimensions, and are approved by the API (American Petroleum Institute).

The coupler shown is exemplary and others may be substituted. These pieces are made by Trotub forging to give them the required form and then a central hole is drilled. The coupler thus formed can be attached to the ζ pipe by friction welding in one of two ways.
I can get 1 train. First, welding is performed along line 40. The friction welding procedure requires that one of the tubes or the coupler be clamped in a hydraulically operated chuck while the other component is clamped in a hydraulically operated clamp. The coupler is held in the chuck by its square face 13 or other flat.

The coupler and the end of the tube are aligned, with the clamp holding the member first and the other. Preferably, it is a tube that is held. The parts are moved into proximity and the chuck holding one part is driven by a motor at a preset rotational speed. This speed is generally less than 50 rpm. Axial pressure is applied at a controlled rate to generate frictional heat. When friction occurs, the softened metal gradually tightens from the heated interface, forming a forging pressure collar. Once the predetermined temperature is achieved, the rotating spindle is declutched from the main motor and stopped, moving axially to forge and heat process the interfacial zone to form a fully extended solid weld. pressure increases.

In this first method, the joint surface of the forged coupler has a diameter that is larger than the tube diameter. In the friction welding procedure, the ends of the tubes are externally pressed to effectively bell the ends of the forgings. In the second method, the end of the tube is first forged and pressed to give it a bell-shaped finish. In the forging of the coupler, the welding line indicated by 46 is previously reduced as shown in FIG. The diameter of the previously shortened forged portion and the diameter of the bell-shaped tube are approximately the same length and are friction welded together as described above.

Once one end of the coupler has been welded to the tube, the tube can be reversed and another coupler will be welded to the other end in a similar manner.

The accuracy and quality of the welded assembly parts exceeds that specified in the 1st standard. The joint has a fine-grained structure, its heat-sensitive zone falls, and therefore has excellent chemical properties.

One of the two inner and outer forging pressure collars formed during the welding process can be mechanically removed if necessary. The term friction welding as used herein should be interpreted to include any necessary post-welding steps such as normalization, quenching or conditioning. These treatments can be performed immediately after the welding process or as a post-treatment of the main process.

The above-mentioned suction rod may be filled with an inert gas or air under pressure for use in wave damped pumping.

According to Figure 1 and Figures 17 to 22, Figure 1 schematically shows the operating stages in the wave-braking oil pumping process, and this meveration is as described above. It is.

The suction rod is installed inside the oil production case, and the oil must be communicated with the suction rod series, so it is generally formed to have a short diameter.

As a result, the hollow suction rod can only have narrow holes. Thus, the maximum height 7 (FIG. 1) reached by the oil in the hollow suction rod is quite high. Obviously, the system is efficient since all of the increased saw pressure is controlled so that once this maximum height is reached, 11+
. However, during the a-stroke the oil has to move in both directions through the hollow suction culm, and even with narrowly configured hollow rings this is not always the case. Thus, at least inscribed in the lower part of the suction rod series, the invention introduces one liter 11 of suction rods with a resulting wide inner diameter.

Figure 17 &! , 1 side shows a wide diameter suction rod with a spiral groove to facilitate the movement of flowing oil. Since this has a wide diameter, it is impossible to place the connector on the outside of the tube.

Thus, as shown, the connector used is a bin-to-bin type IO, as illustratively described with respect to FIG. The connector 50 is screwed to the end of the suction rod 5j (wide diameter), the inner diameter of which corresponds to the outer diameter of the reference box. A seal 52 is provided to prevent escape of pressurized gas.

FIG. 18 shows the l variant, in which a wide diameter suction rod 51 is shown.
In order to form a bottle-shaped coupler 33 at the end thereof, the neck is made a short diameter. This can be formed by friction welding the reference bin coupler along line 54 to the wide diameter tube.

19 and 21 show a modification of the suction rod shown in FIG. 18 in which the bottle coupler is provided with an elevator shoulder 55. FIGS. The difference between the suction rods shown in Figures 19 and 21 is
If the edge of the rod shown in FIG. 21 is rounded, it will exist in an internal arrangement that is continuous with the narrow part of the neck. These wide diameter rods are 1? When friction welded,
External fludge should be removed. This is due to dimensional constraints, but the internal fludge can be left in place as the fluid path remains at least as wide as the fluid path through the connection.

The diameter of the wide diameter suction rods is
- Due to the need for oil for racing
bll limited. It is possible +) We intend to widely formulate these. In order to make the coupler (=t tJ), a connection between 11 and 11 with a shorter inner diameter (r) is required.

A refueling part 5 is disposed at one end of a suction rod having a wide diameter directly above the plunger. This is in 5'
I? It is welded. However, it can be formed as a separate component with its own coupler, thereby
Can be connected to the lowest suction culm. For the 1st part of the refueling L1 part, move this to plunge +6 and the travel j located below Jj.
It is equipped with a hollow coupler that connects r and one ζ.

FIG. 20 shows a refueling 1'' member with a bottle coupler 58.

The 221Q+ is a refueling unit 1- equipped with a box-type sticky device 59.
1 part indicates the month.

In the illustrated embodiment, a large number of oil supply 1'' 60 are arranged around the oil supply 1'' member 56, and the number thereof is four. These are 1: the oil that communicates with the interior of the end suction tube and flows into the suction rod series (J, the central port that passes through one of the four external ports 60 or through the coupler); There is a constant flow of water.

21 of these! The entire structure is vertically extended so that the oil can flow in an optimal manner.

Although I don't know, it is of course possible to use a wide diameter suction rod across these series. Wide diameter suction rods can also be used for closed wave damping devices.

Now looking at Figure 1 of Figure 41 and Figures 23 to 32, we see that
The figure schematically illustrates the general principle of wave-braked pumping. This operation is as described above. However, in Figure 1c,
It will be noted that when the train begins its downstroke, the oil rises to its highest height 7 within the suction rod train. This level is not the end of the sequence.

A hollow ring placed above this point is unnecessary except for the purpose of pressurizing the series. This aspect of the invention recognizes this fact and includes a sump containing upwardly flowing oil. The sump is taken to its surface by a series of suction rods.The sump is placed at a pressure greater than the pressure at the interface of the well to be used, with an inert gas, until the oil reaches the wellhead 1' or the oil reaches it. It is engorged before it is filled.

This predetermined pressure is less than the pressure at the interface during the upstroke of the suction rod, so that on the first amp stroke ζ the seal is broken and the pressure in the sump is equal to the pressure at the interface. Become.

For example, the interfacial pressure reaches 1,000 ps +, and the up-stroke
z +++++ k JA y ko1, no l -F j
I:1111--'! The pressurizing pressure will be 4.

Br is a flapper valve as shown in FIGS. 23, 271; 2+ and 31. The flap 70 is mounted as a pivot on the wall of the liquid reservoir 7I, and the liquid reservoir is located at IJ.
seat 72 until it is pressed.

This is shown at No. 23a, where the flap 70 is about 1 degree iF(
When the well pressure overwhelms the seal, its location is shown at 23b. Flap is 11 meters and JJ:e
It is kept out of the 'C' engagement by turning and holding the clip 73.

Other arrangements are shown in Figures 24 and 28, with reservoir locations
) until the J Cool 74 is seated on the valve seat 75.

When well pressure overwhelms the seal, the pole moves upwards and
By means of the ball catch & J device, generally indicated by 77, position 7
It is arbitrarily released from the engaged state at 6.

As an alternative to flapper or ball valves, down-pole shutoff valves are provided and actuated to open and close the valve.

This is carried out by rotating or activating the suction rod train. This valve system is superior to the previous two systems because the reservoir can be freely withdrawn from the well with the original gas pressure, and it responds to changes in well pressure when closed, ignited, or left completely open. It's more Frey 1-Schizor. The flapper valve and ball valve controlled sump are withdrawn from the well and held open during operating procedures. Of course other valve means may be used and the invention is not limited to those described.

Figures 23 and 31 show a flow port member 79 having five inlets for communicating oil from the well to the sump with a flapper valve closed at its bottom end (-1) when in use. The flow port member has been described in more detail with respect to other ffE aspects of the invention, but two variants are shown here.The variant shown in Figure 27 includes a pin coupler 80 connected to the plunger, The one shown in FIG. 31 includes a box-type coupler 81 connected to the plunger.

The reservoir is comprised of a main reservoir body 82 having a relatively large internal volume. Seal unit 8 at this lower end
3 is formed or attached, and the unit 83 with is connected to the main body in case of sealing the engagement,
shall include flapper valves, ball valves or other valve means. The volume of the sump needs to be varied depending on the characteristics of the well being operated. If it is necessary to increase the volume, the upper end of the main body can be taken up by one or more of the wide diameter hollow suction rods that form another aspect of the invention.

When used in this manner, these wide diameter rods form part of the reservoir.

The upper end of the reservoir is connected by a connector 85 to a solid suction rod series 84 shown in FIG. 30 or to a continuous empty suction rod series.

Blow the liquid reservoir in one direction with air or inert gas before use.
(It passes through 6 and is pressurized to a predetermined pressure.

Although the exact location varies, the dirt is generally located in the connecting area between the sump and the suction rod spring.

In FIGS. 25 and 21), the valve 86 is embedded in the bottle combiner at -Lj:ff of 7)), in which case the sump main body 83 and in other cases a wide diameter hollow suction rod. ■
The directional valve would be housed in the neck separating the two box couplers as shown in FIG. 32 and neck 85. connector 8
5 is a glass-filled P in the box coupler connected to the liquid reservoir.
The TFE seal 88 can be removed. Connector 85 is formed long enough to accommodate valve 86, but is otherwise generally formed.

■The directional valve is connected to the corresponding internal thread of the neck of the connector 85.
a The external 90 (No. 261: J
). The valve stem 91 is held biased by a spring 92 to close the valve 93 in the seat 94 (7). 7. If necessary, the lower end of the liquid reservoir is not directly connected to the plunger of the travel valve, but is connected to a solid or It is connected to the plunger through a series of hollow suction rods.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram schematically illustrating the general principle of wave-braked pumping of oil producing wells. Fig. 2 shows an embodiment of the connection between two suction rods. Fig. 3 shows another embodiment of this connection. Figure 4 shows a seal for use in the embodiment shown in Figure 3. Figure 5 shows the seal of Figure 4 in a separated state. 7, 8 and 9 show various embodiments of the coupling means shown connected in each case to one suction rod. FIG. 1O shows a variant of the coupling means. FIG. Fig. 12 shows an embodiment in which the connecting means is integrated with the suction rod.
2 shows a side view of a connector embodying the embodiment. FIG. 13 shows a modification of the connector shown in FIG. 12. FIG. 14 shows another embodiment of a connector mounted on a rod, each having a modified type of box coupler. FIG. 15 shows another embodiment of a box coupler mounted on a hollow field. Fig. 16 is a side view of a pin-type end coupler formed by the method according to Ike's embodiment. Fig. 17 is a pin-pin type end coupler. Figure 18 G'J shows the suction field embodying the IfiMla of the present invention when connected to a connector. Figure 19 shows the suction field shown in Figure 18 but with the electric heater shoulder removed. Figure 20 shows the lower end of the suction field with the filler port member. Figure 19 shows a suction field similar to that shown in Figure 19. Figure 22 shows a refueling unit with a central box coupler connected to the refueling Ij plunger. Figure 23 shows 417j FI, FIG. 24 shows a ball valve system that does not seal the reservoir until positioned. An embodiment is shown. Fig. 26 shows the one-way brake means in more detail. Fig. 27 shows a flapper valve with an additional oil filler member. Fig. 28 shows an extension to the reservoir. Figure 29 shows an embodiment of the coupling between the end of the sump and the end of the solid suction field series. Another embodiment of the coupling between the sump and the suction rod series of solids is shown. FIG. 31 shows a flapper valve that accommodates deformation of the filler member, and FIG. shows a connector including one-way valve means coupling the connector to a suction field series of: lO; suction field, ll; box coupler, 12; screw means, 13F spanner flat, 14; elevator shoulder, 15; Pin type coupler, 16; annular seal (sealer)
, 17: Internal hole. Engraving of the drawings (no change in content) (a) (b) (c) (d> (e) FIG, l. Continued priority claim on page 1 [Phase] October 5, 1981 [Phase] UK ■
October 5, 1983 [Sat] United Kingdom (GB) [Sat] 8326656 S (GB) @8326657 Procedural amendment stamp December 7, 1983 Mr. Manabu Shiga, Commissioner of the Patent Office. ,zu (1 1. Indication of the case Patent Application No. 209622 of 1982 2. Name of the invention 3.1ili Relationship with the case Patent applicant 5. I (positive subject

Claims (1)

[Scope of Claims] (Comprised of 11 hollow suction rods and the same number of connecting means for connecting two adjacent suction pipes to each other, the connecting means being hollow and provided with a sealing means, whereby the interior of the suction rod is A series of suction rods for pumping up and braking a body, which are in communication and have a pressure state different from the pressure outside the suction rods. (2) The whole is hollow and has a cylindrical shape, A connector for a suction rod, comprising means for engaging the suction rod at least at the L end, and sealing means for sealing between the inside of the suction pipe connected to the connecting means and the outside of the rod. A rod connector having opposite ends, each of said ends comprising internal coupling means of the rods connected by the connector. (4) Forging the two mating units, Drill or create an axial hole along the length of each of the throats, provide a tube of the required dimensions, and friction each end of the tube into a respective one of the coupling units having the drilled holes. A method for making a hollow tube having a joint end comprising the steps of welding. A series of suction rods with a plurality of suction rods installed at least at the bottom thereof. (6) Prior to insertion of the down hole, the liquid reservoir is compressed to a pressure at least equal to the pressure at the down hole interface (ink face). The reservoir consists of a reservoir with a closed downhole, containing the gas contained in the reservoir, and is provided to allow suction of oil during the suction stroke of the pump. A device used for suction of oil characterized by compression and damping of waves. (7) One end connected to the connection of the suction rod and forming part of a liquid reservoir surrounding the compressed gas downhole. 1. A connector comprising a one-way self-valve means having a suction rod connected to the connector and the other end adapted to be connected, and for filling the reservoir with compressed gas prior to the suction rod being connected to the connector.