RU35134U1 - High-viscosity sucker rod pumping unit - Google Patents

Description

GitEptgs .vFSiri 15:; „.,. I

Borehole PUMP PUMP UNIT 1CA FOR PRODUCING HIGH-VISCOUS OIL

The device relates to the oil industry and can be used to operate wells with highly viscous products.

A well-known sucker rod pumping unit, consisting of a drive, a string of sucker rods, a downhole pump, a string of pumping pipes. During the operation of a well pump driven by a drive through a collet of sucker rods, the fluid along the tubing string rises to the wellhead, from where it enters the collection system / A.G. Modchanov, V.L. Chicherov. Oilfield machines and mechanisms. Textbook for technical schools. 2nd ed., Revised. and additional M., Nedra, 1983.-p. 34-37 /.

The disadvantages of the installation are the low filling factor of the pump and the freezing of the rod string leading 1; it leads to disruption of the operation of the entire installation during the production of highly viscous industrial production due to the significant number of hydrodynamic friction forces arising from the movement of the rod string, which reduces the reliability of the deep-well pump installation.

The closest in technical dryness and the achieved result is a borehole sucker rod pump /a.s. USSR No. 987175, class F 04 B 47/02, publ. 01/07/83 g. No. 1 /, the plzsher of which is filled with longitudinal slots and attached to the column of pump pipes, and the cylinder passes through; the diameter of the plunger through the slots of the plunger is connected to the rod string, and the slots in the plunger are filled so that the cavity of the pump pipes communicates in the lowermost position of the cylinder through said slots with a well. The pump is filled with well products during the course of the rod string and the cylinder down. The movement of the cylinder with the open suction valve towards the HOTOIQ fluid increases the pump pressure coefficient when high viscosity products are obtained. The downward stroke of the cylinder is demarcated by cargo shafts located in the lower part of the rod string. 2003126314 Illllimillllllli 2Q4) 3t26: S14 Object device MKI F 04 in 47/02

The disadvantage of the installation is that the use of cargo rods in the lower part of the rod string to ensure its downward movement has a low efficiency. So the use of cargo rods with a diameter of 25 mm instead of rods with a diameter of 19 mm allows you to increase the weight of the replaced section of the column of rods by about 1.7 times. However, when using a string of pump pipes with an inner diameter of 62.5 mm, an increase in the diameter of the rods from 19 to 25 mm, ceteris paribus, leads to an increase. (1 4.2 times / Valeev M.D., Khasanov M.M. Deep-pumped viscous oil production - Ufa: Bashk. installation.

The technical task of creating the device is to increase the reliability of the deep-well pumping unit during the production of highly viscous products by eliminating the hang of the rod string.

The indicated technical problem is solved by a borehole sucker rod pumping unit for producing highly viscous products from a well with a sump, including a ground reciprocating drive connected by a wellhead rod sealed in the wellhead with a string of pump rods, size, suspended in a column suspended in the wellhead reinforcement pump pipes and a borehole sucker rod pump, the plunger of which is made with longitudinal slots and is connected to the pump pipe string, and the cylinder through a slot passing through the plunger diameter is connected to the rod string, wherein the slits in the plunger vsholneny so that in the lowest position of the cylinder cavity pumping pipes soobp1; aetsya through said slot with the well.

What is new is that the downhole sucker-rod pumping unit is additionally equipped with a load attached to the bottom of the pump cylinder placed in a well sump filled with water.

In FIG. 1 schematically shows a general view of the installation; in FIG. 2 - installation pump at the lowest position of the cylinder.

The well-sucker-rod pumping unit (see Eng. 1) contains a ground reciprocating drive 1, connected by a wellhead rod 2, sealed in a wellhead 3, to a column of pump rods 4, suspended in a column of pumping pipes suspended in a wellhead 3. 5 and a sucker-rod pump 6, the plunger 7 of which is filled with longitudinal slots 8 and connected to the column of pump pipes 5. The cylinder 9 is connected through the diameter 10, passing through the slots 8 of the plunger 7, with the column of pump rods 4. Slots 8 in the plunger it is completed in such a way that the cavity of the pumping pipes 5 is connected in the lowermost position of the cylinder 9; it passes through the slots 8 to the bore 11. A load 12 is attached to the cylinder 9 of the borehole sucker-rod pump 6, placed; filled in the sump 13 of the bore 11 filled with water 14 . The load 12 is attached to the cylinder 9 through the rod 15.

Installation works as follows; im way.

The ground drive 1 transmits through the wellhead rod 2, sealed in the wellhead 3, the reciprocating movement of the string of pump rods 4, dimensioned 1, in the string of pump tubes 5. When the cylinder 9 moves downward under the action of gravity of the string of pump rods 4 and load 12 under the plunger 7 forms a rarefied space into which the production of the well enters through the suction valve 16, which has opened under the influence of a pressure differential. The movement of the cylinder 9 with the open suction valve 16 towards the fluid flow in the well increases the filling coefficient of the downhole sucker rod pump 6. During the course of the rod string 4 and cylinder 9 upward, the suction valve 16 closes, pressure is exceeded at cylinder 17 of cylinder 9; its pressure is the column of pumping pipes 5, due to which the discharge valve 18 opens and the fluid from the cavity 17 of the cylinder 9 is mixed; it is transferred to the column of pumping pipes 5 and then goes to the wellhead. Further cycles are repeated.

The placement of the cylinder 9 in the lowest position (see Fig. 2) is achieved by lowering the rod string 4 all the way down, while the cavity of the pump tubes 5 is connected through the slots 8 to the well 11, which allows heat treatment of the bottomhole zone of the well. Coolant (shown

arrows) is pumped along the column of pump pipes 5 and through the slot 8 enters the well.

Through the slots 8, the liquid is also drained from the colony of pump pipes 5 when the pump is lifted from the well, since the cylinder 9 is also in its lowest position.

The stable operation of the installation in the production of highly viscous products is characterized by the fact that the ratio of the dynamic load during the rod string down to the weight of the rod string should not exceed a value of the order of 0.3 to avoid frequent rod patterns / Vaneev M.D., Khasanov M.M. Deep Pumping Viscous Oil - Ufa: Bashkir. Prince Publishing House, 1992, p. 101 /, that is, the minimum load at the point of suspension of the rods (TPS) should not exceed about one third of the weight of the column of rods. Since the installation uses a load that makes the rod string heavier, the expression of the minimum load in the TPS can be written as

P - (+ P) GP

min 1shya

where RPYP - the minimum load in TPSh, I;

 - respectively, the weight of the rod string and the weight of the load in the liquid, I.

Since the placement of the load 12 in the sump 13 of the well 11 filled with water 14 excludes the influence of hydrodynamic friction forces acting on the load 12 when it is mixed, the minimum load in the TPS is determined by the expression

  pcs gr.

where the hydrodynamic friction force acting on the string of pump rods during its downward movement, N;

Solving the system of these two equations, we obtain the formula for calculating the necessary and sufficient to ensure stable, without hanging the pump rod string during the downward stroke, the unit’s operation when the high-viscosity oil reaches the weight of the cargo on the surface, taking into account the weight loss coefficient of the rod string and cargo in the liquid

gr i, JO frnp.H fjum

where Rgr and Rsht - respectively, the weight of the cargo and the weight of the string of pump rods on the surface, N; B - coefficient notary of the weight of the rods in the liquid;

Calculation of the hydrodynamic friction force acting on the string of pump rods during its downward movement F, „can be performed according to the formulas given in / Valeev M.D., Khasanov M.M. Deep-pumped viscous oil production - Ufa: Bashk. Prince Publishing House, 1992, p. 56 /.

Such an installation ensures stable operation of the installation during the production of highly viscous oil without hanging up the string of pump rods during downward flow and increases the reliability of the operation of the installation.

Claims (1)

A downhole sucker rod pump unit for the production of highly viscous oil, including a ground-mounted reciprocating drive connected by a wellhead rod sealed in the wellhead, to a string of pump rods located in a string of pumping pipes suspended in the wellhead, and a well sucker rod pump whose plunger is made with longitudinal slots and attached to the column of pump pipes, and the cylinder through the passage passing through the slots of the plunger diameter is connected to the column of pump rods, and the slots in the plunger are made in such a way that in the lowermost position of the cylinder the pumping tube cavity communicates through the said slots with the well, characterized in that it is additionally equipped with a load attached to the bottom of the pump cylinder placed in the well sump filled with water.