RU70323U1 - TWO-LIFT DIFFERENTIAL ROD PUMP UNIT FOR SIMULTANEOUS-SEPARATE OPERATION OF WELLS - Google Patents

Abstract

The utility model relates to the oil and gas industry, in particular to pumping units for simultaneous and separate operation (hereinafter ORE) of two oil reservoirs using two parallel columns of elevator pipes. The purpose of this utility model is to create a two-lift differential rod pumping unit for simultaneous and separate well operation using two parallel columns of elevator pipes, driven by one rod column, which allows for separate intake and transport of oil in an immiscible mode. A two-lift differential rod pumping unit for simultaneous and separate operation of two oil reservoirs, including two parallel columns of elevator pipes, one of which is a tubing and compressor, and a packer, one of the elevator columns is formed of continuous flexible pipes, and the tubing string contains a pipe with side valves and an anchor shoe, which forms, together with a set of twin plug-in pumps, two types of pumps, namely: plug-in and non-ball, driven by a single column of rods, with the possibility of transferring the sintered product immiscible layers in the form of two columns of tubings, and products lower reservoir pumped through the tubing string and the top - the column of continuous coiled tubing. Thus, a two-lift differential rod pumping unit for simultaneous and separate well operation using two parallel columns of elevator pipes, one of which is formed of continuous flexible pipes, driven by a single column of rods, allows separate intake and transport of oil in an immiscible mode: products lower layer

it is pumped through the tubing string, the upper - through the string of continuous flexible pipes. Obviously, the use of continuous flexible pipes in combination with a differential pump facilitates tripping operations during underground well repair and simplifies the design of underground equipment by refusing an additional drive in the form of a rocking machine and one rod string, that is, reduces metal consumption , and, consequently, cost. It is also obvious that the use of a nozzle in the design of a differential sucker rod pump for simultaneous and separate operation of wells allows technically simplifying the design of the pumping unit by abandoning the column anchor and packer and, in connection with this, quite time-consuming underground work to install and remove them from the well during the repair of the deep pumping equipment of the well, as well as to simplify the process of underground repair through the use of plug-in sucker rod pumps and seamlessly conduct exploration of the upper reservoir.

Description

The utility model relates to the oil and gas industry, in particular to pumping units for simultaneous and separate operation (hereinafter ORE) of two oil reservoirs using two parallel columns of elevator pipes.

Known double-lift sucker-rod pumping units for the operation of wells by the WEM methods, the design of which contains:

1. two parallel columns of elevator pipes, composed of tubing (hereinafter tubing), each of which is lowered sucker rod pumps with a column of rods to drive the pumps;

2. one packer for hydraulic separation of layers, mounted on the longest column of elevator pipes (that is, held on the lower layer);

3. a special design of an anchor for tensioning the column of elevator pipes after descent into the well, used to facilitate the descent of the second column of rods.

One of the pumping units operates the lower layer, the other upper. The advantage of this design is that pumping units allow pumping the production of wellbores in an immiscible form, as well as, under certain conditions, replacing the plug-in type of pumps during underground repairs independently of each other (in the book “Simultaneous Separate Operation of Multilayer Oil Fields.” M. Subsoil. 1974. p. 101-102).

But this design has serious drawbacks. Firstly, tubing diameters should be no more than 50 mm for their descent into production casing with a diameter of 168 mm, which limits the application

plug-in pumps of a size range of more than 32 mm, and not plug-in pumps - more than 44 mm. The use of non-standard pumps complicates the underground repair, in case of failure of the lower pump, both suspensions are removed from the well. Secondly, to avoid complications during the hoisting operations during underground well repair, the edges of the tubing couplings must be previously grinded, that is, they are chamfered. Thirdly, the use of standard 50 mm couplings in the tubing string makes it impossible to lower pumping equipment into production cores with a diameter of less than 168 mm according to the “two parallel elevators” scheme. Joining couplings with a diameter of 73 mm is possible, but it is unsafe. Fourth, the pumping units at the mouth should have two independent drives, that is, equipped with two pumping units.

Also known is a differential pump designed by V.A.Safin et al., Driven by a single column of rods, but allowing to take and pump the products of two layers independently of each other. (Information on this pump is published in the books “Simultaneous Separate Operation of Oil Formations” (Tatar Book Publishing House. Kazan. 1967), and “Reference Book on Oil Production” edited by Dr. K.K. Gimatudinova (M. Nedra. 1974) This pump consists of two series-connected pumps of plug-in or non-plug-in type and two column packers. Packers have different purposes. The bottom - is used for hydraulic separation of layers or, more precisely, the receiving valve of the lower pump, which takes the products of the bottom a reservoir, from the upper top -.. for receiving hydraulic separation and discharge of the upper pump valve accordingly to provide structural rigidity entire system must be anchored.

The lower pump of the usual type has a concentric arrangement of the suction on the cylinder and discharge on the valve plug. The top pump has an unusual design. His plunger does not have

valves and is connected to the lower plunger by a hollow rod and is therefore hermetically isolated from the chamber between the pumps. His appointment is twofold. It connects the lower pump to the column of elevator pipes, that is, it serves to transit products from the lower pump. On the other hand, the reciprocating movement of the upper and lower plungers due to the difference in their diameters cause the appearance of vacuum pressure and compression in the chamber between the pumps. This actuates two valves, namely: suction and discharge, located on the side surface of the pipe connecting the pump cylinders. The valves, as mentioned above, are hydraulically disconnected from each other by the packer, which allows pumping products through the production string.

But this pump also has serious operational disadvantages. Due to the use of packers to separate reservoirs, it seems problematic in the pumping units of the WEM type to control the level of the liquid, that is, the reservoir energy, of only one of the reservoirs, usually the lower one, but in this design of the pumping installation, which uses two packers, it becomes difficult to control the level of both layers. A packer installed in the production casing to isolate the lateral suction and discharge valves eliminates the control of the level of fluid in the upper formation carried out along the annulus of the well.

Of the other problems, a technical focus on the use of tube type pumps should be noted. Although the lower pump can be plug-in type, but the upper one is only pipe type. Its diameter should be at least 57 mm to allow passage of pumps with diameters of 28 and 32 mm, which have an outer diameter of less than 45 mm. Pumps of the following size range, that is, 38 and 44, have an outer diameter of more than 57 mm., Which clearly limits their use and significantly complicates both the layout and repair work on replacing the pumps. Obviously, plug-in pumps should be used in this case.

There are problems associated with the lifting of products for the production casing. A moving oil stream, which contains aggressive components, can accelerate the corrosion of the pipe body and damage the production string, which is fraught with loss of oil reserves of the well.

The purpose of this utility model is to create a two-lift differential rod pumping unit for simultaneous and separate well operation using two parallel columns of elevator pipes, driven by one rod column, which allows for separate intake and transport of oil in an immiscible mode.

The proposed two-lift differential rod pumping unit for simultaneous and separate operation of wells driven by a single rod string is a structure consisting of two complex units, forming actually two types of pumps, namely:

1. Non-standard pump NN (in the figure 1 is marked with the letters NN), lowered into the well as part of the tubing 1. The products of this pump are pumped to the surface by a continuous flexible pipe string 6.

2. The plug-in pump VN (in the figure 1 is marked with the letters VN), run down the tubing string 1 as a part of the rod string 23. The products of this pump are pumped to the surface by the tubing string 1.

The first complex - the NN non-proprietary pump - consists of a set of plungers 3 and 11, which are part of the complex of double plug-in pumps 2 and 14, and a special design pipe 13, which contains:

- at the ends of the shoe anchor (in figure 2, position 25), which, together with cuffs 7 and 12, which are part of the dual pump complex, act as seals, sealing the interplunger chamber of the NN non-integral pump, that is, the chamber formed by plungers 3 and 11, and at the same time serve for landing of the complex launched in tubing 1

twin plug-in pumps 2 and 14 (in figure 2 view "A" is an enlarged view of a fragment of the anchor shoe 25 and cuff 7);

- two valves located on its lateral surface, namely: a side suction valve 10 and a side discharge valve 8.

Plungers 3 and 11 of the set of double plug-in pumps 2 and 14 have different diameters of the cylinders and plungers (Fig. 1 shows their cross-sectional area, S1 and S2, the cross-sectional area of the pump 2 plunger is larger than the cross-sectional area of the pump 14 plunger, i.e. S1> S2) . The hydraulic connection of the interplunger chamber of the NN non-standard pump with side valves 8 and 10 is ensured by perforations 9, which are located at the junction of the pumps 2 and 14. A lateral suction valve 10 connects the internal cavity of the NN non-standard pump to the well. Its purpose is to take the products of the upper layer 20 into the interplunger chamber. A side discharge valve 8 connects the interplunger chamber of the HH non-integral pump to the continuous flexible pipe 6. Its purpose is to transfer products from the interplunger chamber to the flexible pipe string 6 and then to the surface. The connection of the string of flexible pipes 6 with the side suction valve 10 is carried out using the sleeve 21.

This complex unit, namely: the NN non-sequential pump, descends into the production casing 22 of the well in the following order. The first to a given depth descends in the tubing string 1 (in figure 3) together with the packer 16 and continuous flexible pipes 6 of a special design pipe 13. The continuous flexible pipe string 6 is fastened to the tubing 1 with special clamps 26 and descends simultaneously with the tubing 1, but with using a coiled tubing installation (a coiled tubing installation is not indicated in the figure). After a reliable separation of the strata in the production casing 22 (in FIG. 1), the packer 16 lowers on the rods 23 the assembled complex of twin plug-in pumps 2 and 14.

The second complex - the VN plug-in pump - is part of the dual plug-in pumps 2 and 14 and has a different design of the plunger design (in figure 1 and 2). The lower pump 14 is of the usual type, that is, it contains the suction 17 and discharge 15 valves, the upper 2 without valves. Obviously, the role of the pump for collecting and pumping the products of the lower layer 18 is played by the lower plug-in pump 14, and the upper pump 2 is not involved in this process, but is connected to the lower plunger by a hollow rod 4, by which the products of the lower layer 18 are pumped into the tubing string 1 and further to the surface. Landing and fastening of the set of double plug-in pumps in a special design pipe is carried out using cuffs 7 and 12. The upper pump 2 has cuffs 7 in the lower part of the casing, and the lower pump 14 has cuffs 12 in the upper part (Figure 2 shows an enlarged view of A cuff 7, shoe anchor 25 and thrust collar, which is part of the pumps with cuff mount and serves to fix the complex of twin pumps at a given depth).

This set of dual plug-in pumps 2 and 14 on the rods 23 is lowered into the tubing string 1, that is, in the same way as the plug-in pumps.

A two-lift differential sucker rod pumping unit is operating for simultaneous and separate well operation as follows.

When moving up (in figure 1), the lower VN plug-in pump picks up and pumps the products of the lower layer 18. The product is pumped to the surface through the tubing string 1, which is hydraulically connected to the lower plug-in pump 14 by the plug-in pump 3 plunger, the hollow stem 4 and the plunger 3. During the course of the mechanically connected plungers 3 and 11 of the pumps 2 and 14 move upward by the value L, the volume of the interplunger chamber of the NN non-standard pump increases, which causes a decrease in pressure in this chamber and, as a result, the side suction valve 10 and filling it with the products of the upper layer 20

(in figure 1, the volume of the interplunger chamber is placed on the side field of the sketch and is indicated by number 19).

In the process of downward movement by L (in figure 2), the volume of the interplunger chamber decreases in the interplunger chamber of the non-inserted pump НН, which causes liquid compression and, as a result, reliable closing of the side suction valve 10 and opening of the side discharge valve 8. Production of the upper reservoir 20 displaced from the interplunger chamber of the NN non-standard pump, is pumped through the side discharge valve 8 into the lift pipe string 6 formed of continuous flexible pipes, and is then pumped to the surface. A downward stroke in the lower VH insertion pump causes the discharge valve 15 to open and the suction valve 17 closes. The products of the lower reservoir 18, collected in the cylinder of the VN insertion pump, flow along the hollow rod into the chamber of the plunger 11 and are pumped to the surface along the tubing string 1. Next, the cycle repeats.

Thus, a two-lift differential rod pumping unit for simultaneous and separate well operation using two parallel columns of elevator pipes, one of which is formed of continuous flexible pipes, driven by a single column of rods, allows separate intake and transport of oil in an immiscible mode: products the lower layer is pumped through the tubing string, the upper - through the string of continuous flexible pipes.

Obviously, the use of continuous flexible pipes in combination with a differential pump facilitates tripping operations during underground well repair and simplifies the design of underground equipment by refusing an additional drive in the form of a rocking machine and one rod string, that is, reduces metal consumption , and, consequently, cost.

It is also obvious that the use in the design of a differential sucker-rod pumping unit for simultaneous and separate operation of wells of a pipe of a special design allows:

1. to technically simplify the design of the pumping unit by abandoning the column anchor and packer and, in connection with this, quite laborious work on their installation and removal from the well during the repair of the deep pumping equipment of the well;

2. to simplify the process of underground repair for the replacement of sucker-rod pumps through the use of sucker-rod-type pumps;

2. Conduct unobstructed exploration of the upper reservoir.

Claims (1)

Two-lift differential rod pumping unit for simultaneous and separate operation of two oil reservoirs, including two parallel columns of elevator pipes, one of which is tubing, a packer, characterized in that one of the elevator columns is formed of solid flexible pipes, and the tubing string contains a nozzle with side valves and an anchor shoe, which forms, together with a set of twin plug-in pumps, two types of pumps, namely: plug-in and non-ballast, driven by a single rod string, with possibility of providing pumping immiscible product reservoir in the form of two columns of tubings, and products lower reservoir pumped through the tubing string and the top of the column of continuous coiled tubing.