RU43908U1 - DEVICE FOR DETECTING AND PROTECTING THE RECEIVING AND EXIT OF WELL BARBED PUMP PUMPS FROM MECHANICAL IMPURITIES - Google Patents

Abstract

The utility model relates to the mining industry and is intended for the oil and gas industry when operating oil and gas producing wells containing solid particles, sludge, sand, dirt, etc., namely, devices for retaining mechanical impurities. The purpose of the utility model is to increase the reliability and operational capabilities of borehole sucker rod pumps (SSHN), and, as a result, increase the overhaul period of their work. This goal is achieved by using a device for capturing and protecting the intake and output of borehole sucker rod pumps from mechanical impurities, consisting of a cylindrical body with inlet and outlet nozzles attached to the ends with the possibility of mounting on the thread to the tubing and borehole pump, while inside the cylindrical casing vertically mounted special hub discs, forming side pockets, voids for trapping solid particles during movement I flow the produced fluid through the device. Using the device provides, in comparison with existing ones, the following advantages: a) it is not created on the way of the flow of the produced fluid from the bottom to the pump and from the pump to the mouth of artificial mechanical barriers to retain solid particles (sand), i.e. minimized hydraulic losses to overcome resistance to flow movement; b) structurally, this device is universal in that it can equally protect both the reception and output of the SSHN.

Description

The utility model relates to the mining industry and is intended for the oil and gas industry when operating oil and gas producing wells containing solid particles, sludge, sand, dirt, etc., namely, devices for retaining mechanical impurities.

Prerequisites for creating a utility model.

A device for removing mechanical impurities from a well is known (Aut. St. USSR No. 800341 E 21 B 43/08 “Device for removing mechanical impurities from a well”), which includes:

- perforated pipe (filter);

- a cap with a valve (bottom of the filter);

- an inner tube with a gasket freely located inside the filter, which is provided with holes in the lower part and conical guides and a lock in the upper part.

This device separates mechanical particles; part of them is carried away by the flow, and part settles down, creating an active and passive particle removal zone.

However, the reduction of hydraulic resistance in the active zone and the removal of sand from the passive zone involves the use of significant flow rates and does not separate the flow of liquid and mixture from mechanical particles.

Known anti-sand filter (Aut. St. USSR No. 1550103 E 21 B 43/08 "Anti-sand filter"), which includes: the outer and inner perforated frames and placed between them a set of filtering cermet elements, where the filter element is made X-shaped and expanding to the bases ; while the planes of the smallest cross section and the bases are located between the holes of the inner and outer perforated frames, respectively.

The disadvantage of this design is the accumulation of sand and solid particles during operation in the space between the outer perforated frame and

a set of filtering cermet elements, which creates additional hydraulic resistance to fluid flow.

A device is also known for preventing sand from entering an electric submersible centrifugal pump (Aut. St. USSR No. 439594 E 21 B 43/08 "Device for preventing sand from entering an electric submersible centrifugal pump" (prototype), including a mandrel with a spring loaded, lower turns which are included in the screw thread of the mandrel, and the upper ones in the screw thread of the cylindrical part of the hollow base of the valve with its cage. The device is mounted by means of a coupling above the sub of the electric submersible centrifugal pump in the first pump of tubing (tubing) lifting columns to form therein a chamber for settling of the sand.

The disadvantage of this device is that constructively blocking (limiting) the internal section of the tubing at the pump outlet, it creates additional hydraulic resistance to the fluid flow, not to mention the consequences of the passage of sand through the working parts of the pump.

The purpose of the utility model is to increase the reliability and operational capabilities of borehole sucker rod pumps (SSHN), and, as a result, increase the overhaul period of their work.

This goal is achieved by using a device for capturing and protecting the intake and output of borehole sucker rod pumps from mechanical impurities, consisting of a cylindrical body with inlet and outlet nozzles attached to the ends with the possibility of mounting on the thread to the tubing and borehole pump, while inside the cylindrical casing vertically mounted special hub discs, forming side pockets, voids for trapping solid particles during movement I flow the produced fluid through the device.

The proposed utility model is illustrated in the drawing.

Figure 1 shows a device for capturing and protecting the reception and output of the SSHN from mechanical impurities, including a cylindrical body 1, which is installed above the SSHN in the first tubing of the lifting column and / or below by means of pipes (adapters) of the input 2 and output 3 on the thread SSN (in Fig. 1 tubing and SSN are not indicated).

Inside the cylindrical body 1 between the inlet 2 and outlet 3 nozzles in a continuous chain, special discs-bushings 4. are located vertically, which form the side pockets-voids 5.

The assembly of the device is carried out by screwing the inlet pipe 2 to the end of the cylindrical body 1, then from the other end of the cylindrical body 1 special disc sleeves 4 are dropped one onto the other in a continuous chain, which form side void pockets 5. Depending on the operating conditions of the productive formation, namely flow rate, fractional composition of mechanical particles, viscosity, water cut of the produced fluid, the number of special disc-sleeves 4 is selected.

The cylindrical housing 1, filled with special disc sleeves 4 is pulled together by an outlet pipe 3 having a thread. To protect the pump outlet, the assembled structure by means of inlet 2 and outlet 3 nozzles (adapters) on the thread is installed above the SSH in the first tubing of the lifting column; and to protect the intake of the pump through the outlet pipe 3 - below SSHN.

The proposed device operates as follows.

A device for capturing and protecting the reception and output of SSHN from mechanical impurities is lowered into the well to the required depth. Wellhead equipment is installed and a well is launched, while the flow of produced fluid passing through the device enters the tubing, aiming for the wellhead. Mechanical impurities (scale, sludge, sand and dirt) formed during operation during underground and overhauls of wells (ORS, KRS), chemical. treatments, etc., crumbling from the walls of the tubing and rods and falling down, overcome the force of the high-speed fluid flow and fall into the side pockets-voids 5.

This will be facilitated by the high density characteristic of the deposited substances and the discreteness of the flow of the produced fluid, since the first half of the SSH operation cycle is spent on pumping liquid, and the second on the suction process. For the laminar flow of an incompressible fluid, the partial differential Navier-Stokes equation is used:

Where - pressure gradient;

V is the local speed;

τ is the shear stress;

r, t - current radius and time;

ρ is the density of the liquid.

The velocity field does not change along the length L and depends only on r and t [1].

According to the law of the distribution of fluid flow rates in a round pipe [2], particles falling downward as well as particles carried away by the flow will be pressed against the wall, i.e. by the smallest vector of distribution of flow rates.

According to the Stokes formula:

solid particles settling, as well as those carried away by the fluid flow, having reached the side pockets-voids 5 of the device, will be pushed into them with a force equal to

where μ is the dynamic viscosity of the liquid;

ΔР - differential forces of hydrodynamic pressure;

L is the length of the cylinder of the considered volume of fluid;

V ₀ is the fluid velocity;

R is the radius of the round pipe;

r is the distance from the axis of the pipeline to the particle in question (current radius).

Since the velocity flow V ₀ → 0 is not affected by the cavity of the side pockets-voids 5 of the device, the buoyant forces acting on the settling particles tend to zero. The device will work until the side pockets-voids 5 are filled with settled particles.

Using the device provides, in comparison with existing, the following advantages:

a) it is not created on the path of the fluid flow from the bottom to the pump and from the pump to the mouth of artificial mechanical barriers to retain solid particles (sand), i.e. minimized hydraulic losses to overcome resistance to flow movement;

b) structurally, this device is universally applicable. which equally can protect both reception and output of the SSHN;

c) the ability to ensure the "archiving" of mechanical impurities, sand during the operation of the secondary water supply and their lifting from the well during underground repair of the well even after killing and washing the wellbore, ensuring the safety of contents in the side pockets-voids. The stored solid solids allow us to determine their quantitative and qualitative composition, type, size, chemical. structure;

d) saving time and material costs during ORS in order to clean the bottom of the well from mechanical impurities: it is enough to remove the plunger with rods, lower the device to sand and perform the “backwash” technological operation, during which the compacted sand will be washed and removed. The washing out of compacted sand, usually achieved with a “direct rinse”. will occur due to an increase in the rate of flushing fluid flow in the device zone (reduction in the annular annular space in view of the increased diameter of the device compared to the pump and tubing);

d) increases reliability, overhaul period, protection of the borehole sucker rod pump;

e) the design of the device allows you to collect a container of any length and capacity within the distance from the pump suspension to the bottom of the well and above the pump to the mouth;

g) the protruding dimensions of the device in diameter during echometric studies act as a benchmark;

h) sand removed from the bottomhole zone and settled in the side pockets-voids of the device does not allow him to re-participate in the creation of hydraulic resistance to fluid flow from the reservoir, thereby improving the reservoir properties of the bottomhole formation zone;

i) the side pockets-voids do not create barriers to the flow of produced fluid from the formation to and from the pump, retain mechanical impurities that have settled and risen from the bottom of the well, thereby protecting the pump plunger from jamming.

The proposed utility model can be manufactured industrially, which is confirmed by the tests of the prototype, ongoing.

Sources of information:

[1] Iktisanov V.A. "The study of the patterns of movement of borehole products in the annular channels SHSNU." The dissertation of a candidate of technical sciences. M .. MING them. Gubkina, 1992, 161 p.

[2] Rabinovich E.Z. "Hydraulics". M., Nedra, 1980, p. 106, 127, 250.

Claims (1)

A device for capturing and protecting the intake and output of borehole sucker-rod pumps from mechanical impurities, comprising a cylindrical body with inlet and outlet nozzles attached at the ends with the possibility of mounting on a thread to tubing and a borehole sucker pump, characterized in that it is vertically in the cylindrical body in series, special hub discs are installed with the possibility of forming side pockets-voids for trapping mechanical particles.