RU1800109C - Method of mounting bore hole sucker-rod pump - Google Patents

Abstract

SUMMARY OF THE INVENTION: A pump cylinder is connected to a tubing string. A suction valve and a plunger with a rod are installed in the cylinder. The rod is connected to the rod string. A hydraulic test of the pump and pipe string is carried out. Valve and plunger installation and hydraulic testing are performed on the surface. The pump is connected to the column with subsection descent into the well. After the descent of each section, hydraulic testing of the pipe string is carried out. The connection of the rod string to the rod is carried out upon completion of the hydraulic testing of the pipe string. 1 ill.

Description

FIELD OF THE INVENTION This invention relates to mechanized oil production, and in particular to the operation of wells by non-standard sucker rod pumps.

The aim of the invention is to increase the reliability of the pump and reduce the labor costs for installation and testing.

Techniques for mounting a non-sequential borehole sucker rod pump are as follows.

A non-standard borehole pump is prepared and assembled in oil workshops before being lowered into the well.

The drawing shows a longitudinal section of a non-integrated borehole sucker rod pump during its operation in the well,

A non-standard borehole sucker rod pump includes a cylinder 1 with a seating seat 2 installed in its lower part, a suction valve 3 with a stem 4, and also a plunger 5 with a pressure valve 6 equipped with a catcher 7 and screwed onto the upper end of the plunger 5 by a rod 8.

During the assembly of the pump, all its components are checked for leaks in the following sequence.

First, the cylinder of the pump 1 is assembled, and then a suction valve 3 is installed in its seat saddle 2. After that, the cavity of the cylinder 1 is connected to the discharge line of the pressure hydraulic pump (not shown) and the pressure is created at it, which is the maximum working pressure for this size downhole sucker rod pump, taking into account the standard safety factor.

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In this way, the tightness of the cylinder 1, the mating surfaces of the landing seat 2 and the suction valve 3, as well as the tightness of the suction valve 3 itself are checked.

Then the excess pressure in the cavity of the cylinder 1 is relieved, the cylinder 1 is disconnected from the discharge line of the injection pump and the plunger 5 with the discharge valve b and the rod 8 screwed onto the end of the plunger 5 are inserted into the cylinder 1. The suction valve 3 is pressed, the discharge is connected line of the pressure pump and create pressure in the cylinder. In this case, the tightness of the discharge valve 6 of the plunger 5 is checked, as well as the amount of fluid leakage through the gap between the cylinder 1 and the plunger 5 of the pump. In this way, all components of the non-sequential downhole sucker-rod pump are hydraulically checked before being lowered into the well.

. Thereafter, a fully assembled and tested non-sequential well sucker rod pump is attached to the tubing string 9 (tubing) and lowered into the well. The filling of the cavity of the pipes 9 with the borehole fluid occurs through the suction 3 and pressure 6 valves of the pump. After the tubing section of a certain length is lowered into the well by means of a pump unit, an excess pressure of the required value is created in them. The absence of pressure reduction in the tubing cavity indicates the tightness of the pipe string 9.

After that, the excess pressure is removed, the next section of the CST is launched, and the operation is repeated.

Thus, a sectional check of the tightness of the pipes 9 is carried out when the pump is lowered to the required depth, without the use of any special pressure testing device. Then, a string of pump rods 10 equipped with an automatic coupler 11 is lowered into the well and a rod 8 of the pump plunger 5 is gripped. After that, the plunger 5 of the pump is raised 250-300 mm from its lowest position in cylinder 1, the wellhead equipment is installed and the pump is put into operation.

When replacing the pump, lower the plunger 5 until it lands on the suction valve 3 and rotate the sucker rods 10, while the rod 4 of the suction valve 3 enters the lock of the catcher 7 installed on the lower end of the plunger 5. After that, the sucker rods 10 are lifted with the plunger 5 and 3 inlet valve

surface. Then, the CST is lifted with the empty cylinder 1 of the pump at the end.

The method of mounting an unintended borehole sucker rod pump ensures the tightness of all pump units and tubing, which ensures its normal operation. In addition, damage to the surface of the plunger is avoided, thereby reducing fluid leakage in the plunger pair and increasing the overhaul period of the pump. It is also possible to use self-sealing plungers which, under certain conditions, give a gain in the pump volumetric flow.

This method is applicable for the installation of all sizes of non-standard well borehole sucker rod pumps.

Example We select a hypothetical well with a depth of H 2000 m. The flow rate of the produced fluid is Og 50 m / day. The well is operated by an NSH2-43 type non-inserted sucker rod pump with a plunger diameter of 43 mm. Depth of descent of the pump Нн 1400 m. Wellhead pressure during pump operation Rust. 1.5 MPa. The pump is crimped to the maximum pressure possible during its operation. The maximum pressure drop acting on the pump is possible when the well is developed by a deep pump after underground repair is performed, when its wellbore is completely filled with filling fluid, provided that when the filling fluid is pumped out, its level decreases before the pump is received. As the filling fluid, technical water, 0 with a density of UOOkg / m3, is taken.

Thus, the maximum pressure drop in the pump cavity with a decrease in the liquid level in the annulus prior to pumping will be equal to

R Rust + (Nn) x 1.5 + 14 15.5MPa.

To ensure the reliability of the pump and the tightness of the lifting pipes, a safety factor of 1.25 is adopted.

Thus, the pressure test is

Ropr. - R x p 15.5 x 1.25 19.375 MPa. Take a pressure test equal to. Nim Ropr. 20 MPa.

Then, according to the sequence of operations described above, the pump units are tested for a given pressure, it is lowered into the well, tightness of the lifting pipes is checked and the pump is put into operation.

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Claims (1)

The claims A method of mounting a non-standard borehole sucker-rod pump, comprising connecting a pump cylinder to a tubing string, installing a suction valve and a plunger with a rod into a cylinder, connecting a plunger stem to a rod string, hydraulic testing of the pump and pipe string, characterized in that to increase the reliability of the pump and reduce labor costs for installation and testing, tired The cylinder of the suction valve and plunger and hydraulic tests of all pump assemblies are carried out on the surface, after which the cylinder 5 of the tested pump is connected to the column of compressor pipes with sectional descent into the well, and after the descent of each section, hydraulic tests of the pump string are performed -compressor pipes, with 10, the connection of the rod string to the plunger rod is carried out after completion of hydraulic tests of the tubing string.