WO2007008183A1

WO2007008183A1 - Hollow rod and a split casing pump for a deep-seated sucker rod pump

Info

Publication number: WO2007008183A1
Application number: PCT/UA2006/000041
Authority: WO
Inventors: Jurij Ivanovich Dolia; Anatolij Iurevich Dolia; Ganna Iurevna Sanzharovska; Bory Iurevich Lunov
Original assignee: Jurij Ivanovich Dolia; Anatolij Iurevich Dolia; Ganna Iurevna Sanzharovska; Bory Iurevich Lunov
Priority date: 2005-07-11
Filing date: 2006-06-22
Publication date: 2007-01-18
Also published as: WO2007008183A8

Abstract

The invention relates to the oil-and-gas industry. The inventive hollow rod of a rod string for a deep-seated sucker rod pump plant comprises a tubular body and heads. Each head is embodied in a solid manner and is sealingly fixed to the rod tubular body. A split deep-well long-stroke rod pump comprises a cylinder embodied in the form of in-series connected sections (8) and comprises a twinned piston (9,10) placed in said cylinder and provided with pumping valves (11, 12) and suction valves. The adjacent sections are connected with the aid of a bolt flange joint (13, 14) comprising at least two centring pins which are located in coaxial through holes embodied along the circumference of the adjacent flanges (13, 14). Each centering pin is embodied in the form of a rod provided with central conical and end threaded parts. The axes of the through holes in the adjacent flanges provided with centering pins are embodied in such a way that they are asymmetrical with respect to the axis of connection of the adjacent sections. Said invention makes it possible to increase the reliability by reducing a load applied to a drive and rods when a reversed drive is carried out and to reduce the wear of the piston and areas connecting the adjacent sections.

Description

EMPTY BAR AND SECTIONAL PUMP BAR DEPTH PUMP UNIT

The present invention relates to the oil and gas industry, and more specifically to the structural elements of a sucker rod pumping unit (SHGU), which can be used, in particular, for oil production. Most of the well stock of mechanized production, as in

Ukraine and the whole world are exploited with the help of SHGNU, but over the past years there has been a continuous increase in the depths of both the wells themselves and the depth of immersion of the SHGU pumps. SHGNU and electric centrifugal pumping units (ESPNU) operate relatively effectively at depths up to 2000-2200 meters. But with an increase in the immersion depth of the rod pump, the weight of the rods also increases, and the diameter of the plunger decreases. Already at depths of 2000-2200 meters, the weight of the rods reaches 80%, and the payload is only about 20%. In addition, the stroke of the plunger is significantly reduced relative to the course of the polished rod, which significantly reduces the flow rate and efficiency of the SHNU. To increase the immersion depth of the pump, the weight of the rods is reduced by using high-strength steels from which the rods are made, but this reserve has already been exhausted. In addition, one of the most important nodes of the ShGNU is a deep-well sucker-rod pump with a pump plunger stroke length of 15 meters or more, the manufacture of which is associated with the need for sectioning - connecting individual sections directly to the well. This work, given the large length of the movement of the pump plunger and the depth of the well, requires high centering accuracy of adjacent sections. Both of the proposed invention are aimed at creating such a design of a sectional sucker rod pump unit, which allowed to increase the productivity and depth of extraction of pumping and reduce its cost.

The closest to the proposed hollow rod in terms of number of essential features is a hollow rod of a sucker rod pump installation containing a cylindrical body and heads mounted at the ends of a cylindrical body / V. Muravyov. Oil and gas well operation. - M .: Nedra - 1973. - S. 210 - 230 /. The said rod is made in the form of a cylindrical pipe, and the heads are designed to connect adjacent rods to each other and form a rod string from tubular rods in the well. The described rod is used to protect the pump plunger from sand.

The disadvantage of the described column of rods SHGNU is its large weight in the liquid, which significantly reduces the flow rate and efficiency of SHGNU. The closest to the proposed sucker rod pump according to the number of essential features is a sectional long-stroke sucker rod pump containing a cylinder made in the form of series-connected sections and having a hollow plunger installed in the cylinder with a discharge valve, as well as a suction valve / A.c. USSR N ° 1193292, IPC 4 F04B 47/00, publ. 11/23/1985 Bull. Ne 43 /. Sections of the described cylinder are located in the casings.

Cylinder sections are mounted directly on the well, while certain violations of the centering of the sections are possible, which are compensated by the conical shapes of the hollow plunger and the end sections of the sections. Moreover, during the movement of the plunger, the mentioned conical surfaces interact with each other and center adjacent sections, but during the movement of the plunger through the junction of the sections, both he and the sections undergo increased wear. In addition, the presence of a casing and additional elements significantly complicates the design of the sucker rod pump, which reduces its reliability and increases the price. The basis of the proposed inventions is the task of creating such a hollow rod and a sectional borehole long-stroke rod pump, which would be more reliable by creating conditions to reduce the load on the drive and the rod. The problem is solved by the use of the proposed rod in the SHGNU design, which allows creating conditions for reducing the rod weight force by using the buoyancy force of the fluid that the well is filled with on the rod.

The proposed, as well as the well-known hollow rod of a sucker rod pump installation, includes a tubular body and heads mounted on the ends of the tubular body, and, in accordance with the proposal, each head is made solid and hermetically fixed to the corresponding end of the tubular body.

The problem is solved by the proposed sectional long-stroke sectional sucker rod pump due to the simplification of the design and reducing the wear of the plunger and the connecting sections of adjacent sections.

The proposed, as well as the well-known sectional long-stroke sucker-rod pump, contains a cylinder made in the form of series-connected sections and has a hollow plunger installed in the cylinder with a discharge valve, as well as a suction valve, and, in accordance with the proposal, adjacent sections are interconnected with by means of a bolt flange connection containing at least two centralizer pins located in through-through coaxial holes made around the circumference of adjacent flanges, and each centralizer pin is made oval in the form of a rod having a central conical and extreme threaded sections.

A feature of the proposed sectional borehole long-stroke sucker-rod pump is that the axes of the through coaxial holes in adjacent flanges in which the centralizer pins are installed are asymmetric with respect to the connection axis of adjacent sections. A flange is a connecting part of cylindrical sections (pipes), having the form of a flat ring or disk with holes for bolts evenly spaced around the circumference, designed to connect the flanges of adjacent sections (pipes) to each other along the outer planes of the respective flanges. In this case, the head of each bolt is placed outside one flange, and the free end of the bolt is screwed into the corresponding threaded hole in the second flange.

The invention is illustrated by schematic drawings, where

In FIG. 1 - shows a General view of a sectional pump sucker rod pumping unit;

In FIG. 2 shows a hollow bar.

In FIG. 3 shows a longitudinal section of a connection section of adjacent sections.

In FIG. 4 shows a top view of the connection section of adjacent sections.

In FIG. 5 shows a centralizer pin.

The sucker rod pump installation comprises a column of hollow rods. Each hollow rod of a sucker rod pump installation includes a tubular body 1 and heads 2 mounted on the ends of the tubular body 1. Each head 2 is solid and hermetically attached to the end of the tubular body 1. The head 2, in addition to the function of connecting adjacent rods, also performs the function of plugging the tubular of the housing 1. On the head 2 there is a section 3, which is used for mounting or dismounting the columns from hollow rods - a turnkey square, as well as a standard thread section

4 - for couplings / not shown /. The head 2 has a transitional conical part 5. The joint 6 of the head 2 with a cylindrical body 1 for additional sealing of the cavity of the rod is welded. The head 2 and the cylindrical housing 1 are interconnected by means of a threaded connection 7. A sectional long-stroke sucker-rod suction pump contains a cylinder, the upper end of which is attached to the pump compressor pipes / not shown /. The cylinder is made in the form of series-connected sections 8 and has a hollow plunger installed in the cylinder, containing two series-connected plungers 9 and 10 with corresponding pressure valves 11 and 12. Using a double plunger 9 and 10 in the pump design makes it possible to significantly increase the descent depth and reliability of operation downhole sucker rod pump. Each section 8 is bored and ground to the diameter of a double plunger 9 and 10. At the ends of each section 8, flanges 13 and 14 are rigidly fixed (screwed onto a hot seat) in the factory. Adjacent sections 8 are connected by respective flanges 13 and 14. Through flanges 13 and 14 have through holes for bolts with an internal hexagonal blind hole in the head / not shown / to reduce the dimensions of the flanges. In this case, a hole for the bolt head is made in the flange 13, and the corresponding hole in the flange 14 is threaded for the threaded part of the bolt. In addition, two through holes 15 are made in the flanges 13 and 14, in each of which a centralizer pin is installed, which simultaneously passes through coaxially arranged conical holes 15 in the flanges 13 and 14. Each centralizer pin is made in the form of a rod having a central conical 16 and extreme 17 and 18 threaded sections. Section 17 is designed to extrude the centralizer pin during disassembly of the pump, and section 18 is designed to fix the position of the flanges during assembly of the pump in the well. The taper of the holes 15 and the Central sections 16 of the pin-centralizer is the same. The vertical axes of the two through holes 15 in which the centralizer pins are mounted are asymmetric with respect to the axis of the connected sections 8, which ensures the optimal centering of adjacent sections 8 during installation of the cylinder in the well due to the possibility of displacement of the flanges 13 and 14 to align the axes of the adjacent sections 8 Between the flanges 13 and 14 are seals, each of which is made in the form of a gasoline-oil-resistant ring 19. A twin plunger 9 and 10 of the pump is associated with the drive / not shown / through the column of rods 22. In the lower section 8 of the cylinder is a node of the suction valve, made in the form of two sequentially installed valves 20 and 21.

Previously, under factory conditions, sections 8 of the cylinder are mounted in pairs, they pass and grind to the size of the plunger 9 and 10 in both directions through the connecting section of sections 8. Then, after mounting the cylinder from sections 8 in a fixed position in the factory, conical flanges 13 and 14 are made holes 15 for centralizer pins and place centralizer pins in them. In the locked position of section 8, the holes 15 and the corresponding centralizer pins are marked. Then, the connected and marked sections 8 forming the cylinder are disassembled and transported to the well, where installation is carried out taking into account the marking.

Since the well is filled with liquid, and each rod contains a tubular housing 1 with a cavity 2 sealed with heads, filled with air, the force of its weight is directed downward and the Archimedean force is directed upward, and therefore the weight of the proposed rod in the fluid is substantially decreases, which contributes to an increase in the immersion depth of the rod pump or its diameter without increasing the load on the drive SHGNU. A column of the proposed float rods in a liquid reduces weight, but not mass - inertial acceleration is more intense than in solid and tubular rods, which increases the stroke of the plunger / not shown / compared to the course of the polished rod, and not decrease, as it usually on continuous and tubular rod columns. While maintaining a sufficiently large buoyancy, a column of hollow rod-floats can significantly increase the diameter of the pump or the immersion depth of the pump without increasing the load on the SHGNU drive. Having a significantly larger diameter than traditional rods, the proposed design allows you to increase the speed of the fluid above the pump, which reduces the likelihood of jamming of the plunger 9 and 10 sand. During operation of the SHGNU, when the double plunger 9 and 10 moves upward from the lowermost position in the direction of the highest upper position, the pressure valves 11 and 12 are closed, which ensures liquid is pumped from the above-plunger section (not shown) / cylinder into the cavity of sections 8, and the open suction valves 20 , 21 provide filling of the sub-plunger section with stratum products. During the next movement of the twin plunger 9 and 10 down from the upper to the lowermost position, the suction valves 20, 21 are closed, and the pressure valves 11 and 12 are open, which ensures the displacement of fluid from the subplunger section of the cylinder to the plunger. Due to the rigidity of the connection of adjacent sections of the cylinder 8, their fixation and precise centering with centralizer pins, the twin plunger 9 and 10 move smoothly without jamming along the entire length of the cylinder. Thus, the proposed inventions can improve the reliability of the design, perform the installation of SHGNU with a plunger stroke of 15-25 meters and a liquid lifting height of about 4000 meters with a carrying capacity of 5-7 tons and a capacity of up to 40-60 m ³ per day.

Claims

Claim.

1. The hollow rod of the rod string of the sucker rod pump installation, comprising a tubular body and heads mounted on the ends of the tubular body, characterized in that each head is solid and hermetically attached to the corresponding end of the tubular body.

2. Sectional borehole long-stroke sucker-rod sucker-rod pump pump comprising a cylinder made in the form of series-connected sections and having a hollow plunger installed in the cylinder with a discharge valve, and also a suction valve, characterized in that the adjacent sections are interconnected by means of a bolt a flange connection containing at least two centralizer pins located in through coaxial holes made around the circumference of adjacent flanges, and each centralizer pin and prepared in the form of a rod having a central conical and extreme threaded sections.

3. Sectional long-stroke sucker-rod pump according to claim 2, characterized in that the axes of the through coaxial holes in the flanges in which the centralizer pins are installed are asymmetric with respect to the axis of the connection of adjacent sections.