NL2030654B1 - Horizontal well self-centering movable plug type cone valve pump - Google Patents

Abstract

The invention provides a horizontal well self—centering movable plug type cone valve pump. A movable plug type spiral sand scraping plunger, a double—centralizing rotary tooth stirring rod body, a traveling cone valve with a fixed cone valve and a movable cone valve seat and a fixed cone valve with a movable cone valve and a fixed cone valve seat are adopted to achieve timely discharging of produced liquid with sand grains, self—centering of the sand scraping plunger and the traveling cone valve and smooth opening and closing of the traveling cone valve and the fixed cone valve, and the problems about sand grain abrasion and eccentric wear between a long pump barrel and a movable plunger, horizontal well valve leakage, valve ball opening difficulty, untight closing and the like are solved.

Description

P1028/NLpd

HORIZONTAL WELL SELF-CENTERING MOVABLE PLUG TYPE CONE VALVE PUMP

TECHNICAL FIELD

The invention relates to an oil well pump for oil and gas ex- ploitation and non-conventional gas drainage and production hori- zontal wells and inclined wells, in particular to a self-centering movable plug type cone valve pump adopting a movable plug type spiral sand scraping plunger and a double-centralizing rotary tooth stirring rod body.

BACKGROUND ART

By adoption of a horizontal well development mode, an effec- tive path is provided for improving the single-well capacity of an oil and gas exploitation and non-conventional gas drainage and production thin and poor stratum and prolonging the stable produc- tion time. After oil and gas exploitation and non-conventional gas drainage and production enter a stable production stage, the sub- mergence in a well shaft is usually low, at the time, an oil well pump usually needs to be lowered to an inclined well section of a horizontal well, and accordingly when the conventional oil well pump is applied to the horizontal well, the problems about sand grain abrasion and eccentric wear between a plunger and a pump barrel, valve leakage, valve ball opening difficulty, untight closing and the like can happen.

To solve the problems that the pump inspection period is short and the pump efficiency is low during horizontal well ex- ploitation, current common oil well pumps suitable for horizontal well inclined well section exploitation mainly include a horizon- tal well oil well pump with a hydraulic balance compensation hy- draulic cylinder and a horizontal well oil well pump with a guide function fixed valve. Combination of the conventional oil well pump and the hydraulic balance compensation hydraulic cylinder is adopted in the horizontal well oil well pump with the hydraulic balance compensation hydraulic cylinder, the conventional oil well pump and the hydraulic balance compensation hydraulic cylinder are connected through a pull rod, a fixed valve of the horizontal well

0il well pump drives a valve ball through the pull rod, and a traveling valve adopts a mechanical opening and closing mode. The horizontal well oil well pump with a guide function fixed valve has the characteristics that the fixed valve of the horizontal well oil well pump adopts a structure with a guide function, a valve ball is provided with guide ribs so as to centralize the valve ball and reduce friction between the valve ball and a valve cover. Since the hole drift angle at the inclined well section of the horizontal well and the pump hanging position of the inclined well is too large, the valve balls of the above horizontal well oil well pumps still have the problems of valve seat setting lag- ging, valve leakage and the like, special centralizing devices are not designed on plungers, a certain sand grain abrasion and eccen- tric wear problem still exists between the plungers and pump bar- rels, meanwhile, the plungers still adopt hard materials, and plunger bodies are poor in bending-torsion performance and are not suitable for working conditions of large-inclination well sections and high oil liquid viscosity.

In conclusion, based on an existing horizontal well and in- clined well exploitation suction feasible technology, a flow nu- merical simulation and emulation analysis result of a solid phase and a liquid phase in the horizontal well oil well pump and a non- conventional gas well field investigation test result on a Shengli

Oil Field oil-gas well and Ordos Basin, a novel special cone valve pump device with a centering function for a horizontal well is de- veloped and has important significance on the problems about plunger and pump barrel eccentric wear, valve seat setting lag- ging, untightness and the like and improving the efficiency of the 0il well pump.

SUMMARY

To effectively solve the problems in the prior art, the in- vention provides a horizontal well self-centering movable plug type cone valve pump. The horizontal well self-centering movable plug type cone valve pump is characterized by comprising

To effectively solve the problems in the prior art, the in- vention provides a horizontal well self-centering movable plug type cone valve pump. The horizontal well self-centering movable plug type cone valve pump is characterized by comprising a pump barrel, wherein the pump barrel comprises a long pump barrel, a pump barrel coupling and a fixed coupling, the long pump barrel is connected with the pump barrel coupling and the fixed coupling in- to a whole, the inner walls of ring cavities of the pump barrel coupling and a gas anchor coupling are sequentially provided with inner pipe threads and a columnar barrel runner, circular holes are drilled in the bottom centers of the fixed coupling and a drainage base, and a segment pipe thread is arranged on the outer ring surface of the fixed coupling to connect the long pump barrel and the fixed cone valve into a whole;

a sand scraping plunger, wherein the sand scraping plunger comprises a spiral sand scraping column, a movable plunger and a compensation ring, the spiral sand scraping column is composed of trapezoid teeth and a sand scraping base pipe, the outer ring sur- face of the movable plunger is sequentially provided with a coni- cal liquid discharging surface, a columnar clamp ring surface and a columnar slip surface in the axial direction, and a split type bearing bush is adopted in the compensation ring;

a stirring centralizer, wherein the stirring centralizer com- prises a centering connector, a fixed centralizing body, a movable centralizing body, a centering short joint, an anti-scour body and a stirring body, the lower end of the fixed centralizing body is ground into a conical surface, the upper end and the lower end of the movable centralizing body are both ground into conical surfac- es, the middle lower portion of the centering short joint is se- quentially provided with a rod body and a bearing rod, and the stirring body is composed of rotary teeth and a stirring base pipe;

a traveling cone valve, wherein the traveling cone valve com- prises a traveling cone valve body and a traveling cone valve seat, the outer ring surface of the traveling cone valve body is ground into a cone valve surface, a valve seat and valve cover in- tegrated structure is adopted in the traveling cone valve seat,

and liquid guide holes arranged in a layered manner at equal in- tervals in the axial direction are milled in the cover wall of a valve cover;

and a fixed cone valve, wherein the fixed cone valve compris- es a fixed cone valve cover, a fixed cone valve body, a fixed cone valve seat, a guide rod, double springs, a drainage base and the gas anchor coupling, the inner wall of a ring cavity of the fixed cone valve cover is sequentially provided with a conical deep groove and a columnar clamp ring in the axial direction, the upper spring and the lower spring of the double springs are arranged at the upper portion and the lower portion of the guide rod corre- spondingly, the inner wall of a ring cavity of the fixed cone valve seat is sequentially provided with an inverted-cone seal surface, a columnar valve runner and a conical flow guide way from top to bottom, columnar flow holes evenly distributed in the cir- cumferential direction are drilled in the periphery of the circu- lar hole in the bottom of a circular box of the drainage base, and an inner pipe thread of the gas anchor coupling is connected with a gas anchor and a tail pipe.

The horizontal well self-centering movable plug type cone valve pump has the technical effects that the movable plug type cone valve pump can effectively solve the problems about sand grain abrasion and eccentric wear between the long pump barrel and the movable plunger, horizontal well valve leakage, valve ball opening difficulty, untight closing and the like; produced liquid is accelerated sequentially through the columnar flow holes of the drainage base and a variable-section runner between the fixed cone valve cover and the fixed cone valve body and is injected into a ring cavity of the long pump barrel through cone flow holes of the fixed coupling, and then sand grain deposition is avoided accord- ing to the stirring action of the stirring body; the sand scraping plunger achieves up-down limiting through the pump barrel coupling and the traveling cone valve seat, adopts the movable plug type spiral sand scraping plunger, combines the compensation ring to prevent sand grains from falling into an annular gap between the long pump barrel and the movable plunger and scrapes away and dis- charges sand grains adsorbed to the barrel wall of the long pump barrel through the spiral sand scraping column in time; the stir- ring centralizer achieves up-down limiting through the pump barrel coupling and the fixed coupling and adopts the double-centralizing rotary tooth stirring rod body to achieve self-centering of the sand scraping plunger and the traveling cone valve, the traveling cone valve adopts a fixed cone valve and movable cone valve seat structure, and is automatically opened in the lower stroke and au- 5 tomatically closed in the upper stroke along with the reciprocat- ing motion of the stirring centralizer, and the fixed cone valve adopts a movable cone valve and fixed cone valve seat structure and assists the fixed cone valve body in smooth opening and clos- ing through the double springs and the guide rod.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG.1 is a typical structure schematic diagram of a horizon- tal well self-centering movable plug type cone valve pump provided according to the present invention.

FIG.2 is a structure schematic diagram of a pump barrel of the present invention.

FIG.3 is a structure schematic diagram of a sand scraping plunger of the present invention.

FIG.4 is a structure schematic diagram of a stirring central- izer of the present invention.

FIG.5 is a structure schematic diagram of a traveling cone valve of the present invention.

FIG.6 is a structure schematic diagram of a fixed cone valve of the present invention.

FIG.7 is suction operation process schematic diagram of a downhole self-centering movable plug type cone valve of the pre- sent invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

As shown in drawings, a horizontal well self-centering mova- ble plug type cone valve pump is mainly composed of a pump barrel 1, a sand scraping plunger 2, a traveling cone valve 3, a stirring centralizer 4 and a fixed cone valve 5. The upper portion of the movable plug type cone valve pump is fixed to the bottom end of an 0il string through a pump barrel coupling of the pump barrel 1, the lower portion of the movable plug type cone valve pump is con- nected with a gas anchor and a tail pipe through a gas anchor cou- pling of the fixed cone valve 5, and meanwhile the sand scraping plunger 2 is connected with an oil pumping rod column through the stirring centralizer 4 and reciprocates up and down along with the oil pumping rod column.

An axial symmetry pipe body is integrally adopted in the hor- izontal well self-centering movable plug type cone valve pump, the pump barrel 1, the sand scraping plunger 2 and the stirring cen- tralizer 4 of the horizontal well self-centering movable plug type cone valve pump are sequentially coaxially arranged from exterior to interior in the radial direction, and meanwhile the traveling cone valve 3 and the fixed cone valve 5 are sequentially coaxially arranged from up to down in the axial direction.

During assembling of the horizontal well self-centering mova- ble plug type cone valve pump, a fixed cone valve seat and a drainage base of the fixed cone valve 5 are fixed into a fixed cone valve cover through the gas anchor coupling, a fixed cone valve body and double springs of the fixed cone valve 5 sequen- tially sleeve a guide rod of the fixed cone valve 5 and are fixed between the drainage base and a fixed coupling, then, the fixed cone valve 5 is connected to the bottom of the pump barrel 1 through the fixed coupling, then, a traveling cone valve body of the traveling cone valve 3 and a movable centralizing body and a fixed centralizing body of the stirring centralizer 4 sleeve a centralizing short joint, a stirring body and an anti-scour body of the stirring centralizer 4 are connected to the centralizing short joint and then are sequentially sleeved with a traveling cone valve seat of the traveling cone valve 3 and the sand scrap- ing plunger 2, then a centralizing connector of the stirring cen- tralizer 4 is tightened, accordingly, the sand scraping plunger 2, the traveling cone valve 3 and the stirring centralizer 4 are com- bined into a whole to be placed in a long pump barrel of the pump barrel 1, and finally, a pump barrel coupling of the pump barrel 1 is tightened.

The pump barrel 1 achieves upper limiting of the sand scrap- ing plunger 2 and the stirring centralizer 4 through the pump bar- rel coupling 6 of the pump barrel 1 and achieves lower limiting of the stirring centralizer 4 through the fixed coupling 8 of the pump barrel 1, and when produced liquid flows through cone flow holes of the fixed coupling 8, the cross section area of a duct is constantly reduced, the flow speed is gradually increased, then, the produced liquid is injected into a ring cavity of the long pump barrel 7, and sand grain deposition is avoided.

A movable plug type spiral sand scraping plunger is adopted in the sand scraping plunger 2, the spiral sand scraping column 9 can scrape away sand grains adsorbed to the barrel wall of the long pump barrel 7 in time, the sand grains are smoothly dis- charged through tooth gaps between trapezoid teeth of the spiral sand scraping column 9 along with the produced liquid, a movable plunger 10 slides in a reciprocating manner along with a traveling cone valve seat of the traveling cone valve 3, meanwhile, in the upper stroke, a compensation ring 11 is pressed and generates ra- dial deformation so that an annular gap between the long pump bar- rel 7 and the movable plunger 10 can be offset and reduced, sand grain falling is avoided, and finally the problem that horizontal well sand grains abrade the long pump barrel 7 and the movable plunger 10 is solved.

A double-centralizing rotary tooth stirring rod body is adopted in the stirring centralizer 4 and connected with the oil pumping rod column through the centralizing connector 12, the out- er ring surfaces of the fixed centralizing body 13 and the movable centralizing body 15 are in clearance fit with the inner wall of a ring cavity of the traveling cone valve seat of the traveling cone valve 3 at the same time, self-centering of the sand scraping plunger 2, the traveling cone valve 3 and the centralizing short

Joint 14 is achieved, a stirring base pipe of the stirring body 17 and the anti-scour body 16 are in interference fit, the columnar surface where the tooth tip line of the rotary teeth of the stir- ring body 17 and the columnar surface where the tooth tip line of the trapezoid teeth of the spiral sand scraping column 9 are in clearance fit with the long pump barrel 7 at the same time, and therefore the pump barrel 1 and the sand scraping plunger 2 are constantly kept in a coaxial state, and then the problem about ec- centric wear of the pump barrel 1 and the sand scraping plunger 2 is solved.

A fixed cone valve and movable cone valve seat structure is adopted in the traveling cone valve 3 and achieves lower limiting of the sand scraping plunger 2 through the traveling cone valve seat 18, the traveling cone valve body 19 slides in a reciprocat- ing manner along with the stirring centralizer 4, in the lower stroke, the traveling cone valve seat 18 upwards slides relative to the traveling cone valve body 19 along the ring cavity of the long pump barrel 7, the traveling cone valve 3 is automatically opened, in the upper stroke, the traveling cone valve seat 18 downwards slides relative to the traveling cone valve body 19, the traveling cone valve 3 is automatically closed, and accordingly the problem about horizontal well valve leakage is solved.

A movable cone valve and fixed cone valve seat structure is adopted in the fixed cone valve 5, a columnar surface moving pair is formed between the fixed cone valve body 23 and the guide rod 20, the upper spring and the lower spring of the double springs 22 are arranged at the upper portion and the lower portion of the guide rod 20 correspondingly, and therefore smooth opening and closing of the fixed cone valve body 23 are guaranteed. The prob- lems about horizontal well valve ball opening difficulty and un- tight closing are solved, produced liquid in the gas anchor and the tail pipe sequentially flows through a columnar barrel runner of the gas anchor coupling 26, columnar flow holes of the drainage base 25 and the ring cavity and flows into a conical deep groove of the fixed cone valve cover 21 through a columnar valve runner of the fixed cone valve seat 24.

In the downhole self-centering movable plug type cone valve suction operation process of the horizontal well self-centering movable plug type cone valve pump, in the upper stroke suction op- eration of the movable plug type cone valve pump, the sand scrap- ing plunger 2 and the traveling cone valve 3 slide upwards togeth- er along with the stirring centralizer 4, the traveling cone valve seat 18 downwards slides relative to the traveling cone valve body 19, the traveling cone valve 3 is automatically closed, and mean- while smooth opening of the fixed cone valve 5 is assisted through the double springs 22 and the guide rod 20 according to the colum- nar surface moving pair between the fixed cone valve body 23 and the guide rod 20; then, the produced liquid in the gas anchor and the tail pipe sequentially flows through the columnar barrel run-

ner of the gas anchor coupling 26, columnar flow holes of the drainage base 25 and the ring cavity and flows into the conical deep groove of the fixed cone valve cover 21 through the columnar valve runner of the fixed cone valve seat 24, and then the pro- duced liquid is accelerated by the cone flow holes of the fixed coupling 8 to be injected into the ring cavity of the long pump barrel 7; then, the produced liquid flows through tooth gaps of the rotary teeth of the stirring body 17 and is discharged into the ring cavity of the traveling cone valve seat 18 through the traveling cone valve body 19, and finally, the produced liquid se- quentially flows through liquid guide holes of the traveling cone valve seat 18 and the annular space between the traveling cone valve seat 18 and the movable plunger 10 to be discharged into a pump cavity above the spiral sand scraping column 9 and is dis- charged into the oil string through the columnar barrel runner of the pump barrel coupling &.

In the downhole self-centering movable plug type cone valve suction operation process of the horizontal well self-centering movable plug type cone valve pump, in the upper stroke suction op- eration of the movable plug type cone valve pump, the movable plunger 10 upwards moves along with the traveling cone valve 3, the spiral sand scraping column 9 and the movable plunger 10 are pressed due to the action of the hydraulic column pressure, the compression ring 11 is compressed to generate radial deformation, accordingly, the annular gap between the long pump barrel 7 and the movable plunger 10 is offset, and sand grain falling is avoid- ed.

In the downhole self-centering movable plug type cone valve suction operation process of the horizontal well self-centering movable plug type cone valve pump, in the lower stroke suction op- eration of the movable plug type cone valve pump, the sand scrap- ing plunger 2 and the traveling cone valve 3 slide downwards to- gether along with the stirring centralizer 4, the traveling cone valve seat 18 upwards slides relative to the traveling cone valve body 19, the traveling cone valve 3 is automatically opened, and meanwhile smooth closing of the fixed cone valve 5 is assisted through the double springs 22 and the guide rod 20 according to the columnar surface moving pair between the fixed cone valve body 23 and the guide rod 20; then, the produced liquid at the bottom of the ring cavity of the long pump barrel 7 flows through the tooth gaps of the rotary teeth of the stirring body 17 and is dis- charged into the ring cavity of the traveling cone valve seat 18 through the traveling cone valve body 19, and finally, the pro- duced liquid sequentially flows through the liquid guide holes of the traveling cone valve seat 18 and the annular space between the traveling cone valve seat 18 and the movable plunger 10 to be dis- charged into the pump cavity above the spiral sand scraping column 9 and is discharged into the oil string through the columnar bar- rel runner of the pump barrel coupling 6.

In the downhole self-centering movable plug type cone valve suction operation process of the horizontal well self-centering movable plug type cone valve pump, in the lower stroke suction op- eration of the movable plug type cone valve pump, the stirring body 17 on the anti-scour body 16 constantly stirs the produced liquid at the bottom of the ring cavity of the long pump barrel 7, the sand grains flow through the tooth gaps of the rotary teeth of the stirring body 17 along with the produced liquid and are dis- charged into the ring cavity of the traveling cone valve seat 18 through the traveling cone valve body 19, and then the sand grains are discharged into the pump cavity above the spiral sand scraping column 9 sequentially through the liquid guide holes of the trav- eling cone valve seat 18 and the annular space between the travel- ing cone valve seat 18 and the movable plunger 10 along with the produced liquid; and meanwhile, the spiral sand scraping column 9 scrapes the sand grains adsorbed to the barrel wall of the long pump barrel 7 in time, the sand grains are discharged into the pump cavity above the spiral sand scraping column 9 through the tooth gaps of the trapezoid teeth of the spiral sand scraping col- umn 9 along with the produced liquid, and finally, the produced liquid carries all the sand grains to be discharged into the oil string through the columnar barrel runner of the pump barrel cou- pling 6.

Claims (1)

CONCLUSIONS A conical valve pump for a horizontal well of the self-centering, movable plug type, characterized in that it comprises: a pump barrel, the pump barrel comprising a long pump barrel, a pump barrel coupling, and a fixed coupling, the long pump barrel is connected with the pump barrel coupling and the fixed coupling into a whole, the inner walls of annular cavities of the pump cylinder coupling and a gas anchor coupling are successively provided with internal pipe threads and a columnar running rail, with circular holes drilled in the center of the bottom of the fixed coupling and a drainage base, and wherein a segment pipe thread is provided on the outer ring surface of the fixed coupling to connect the long pump barrel and the fixed cone valve into a whole; a sand scraper plunger, the sand scraper plunger comprising a spiral sand scraper column, a movable plunger and a compensating ring, the spiral sand scraper column being composed of trapezoidal teeth and a sand scraper base pipe; wherein the outer ring surface of the movable plunger is successively provided with a conical fluid draining surface, a columnar clamping ring surface and a columnar slip surface in the axial direction, and a split bushing is received in the compensating ring; a rudder centralizer, the rudder centralizer comprising a centering connector, a fixed centralizing body, a movable centralizing body, a centering short joint, an anti-abrasive body and a stirring body, the lower end of the fixed centralizing body being ground to a conical surface, wherein the upper end and the lower end of the movable centralizing body are both ground to conical surfaces, the central lower portion of the centering short joint is successively provided with a rod body and a bearing rod, and the rudder body is composed of rotating teeth and a stirring bottom pipe a moving cone valve, the moving cone valve comprising a moving cone valve body and a moving cone valve seat, the outer ring surface of the moving cone valve body being ground into a cone valve surface, incorporating an integrated structure of a valve seat and valve cover is adopted in the valve seat of the conical valve, and fluid guide holes layered at equal intervals in the axial direction are milled in the cover wall of a valve cover; and a fixed cone valve, the fixed cone valve comprising a fixed cone valve cover, a fixed cone valve body, a fixed cone valve seat, a guide rod, double springs, a drainage base and the gas anchor coupling, wherein the inner wall of an annular cavity of the fixed cone valve cover is successively equipped with a cone sic deep groove and a columnar clamping ring in the axial direction, with the upper spring and the lower spring of the double springs arranged on the upper part and the lower part of the guide rod, accordingly the inner wall of a ring cavity of the fixed cone valve seat is successively provided with an inverted cone sealing surface, a columnar valve guide and a conical flow guideway from top to bottom, wherein columnar flow holes are drilled evenly spaced in the circumferential direction in the circumference of the circular hole in the bottom of a circular box of the drainage base, and wherein an inner pipe thread of the gas anchor coupling is connected to a gas anchor and an exhaust pipe.