CN2503195Y

CN2503195Y - Centering sucker rod

Info

Publication number: CN2503195Y
Application number: CN 01232952
Authority: CN
Inventors: 樊玉兰
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-09
Filing date: 2001-08-09
Publication date: 2002-07-31
Anticipated expiration: 2011-08-09

Abstract

The utility model discloses a sucker rod device used for downhole oil production, which consists essentially of a rod body 3, connectors 1 and 6, gear rings 2 and 5, and a righting paraffin scraper 4, wherein the rod body and the connectors at the two ends are integrated; the righting paraffin scraper is movably sleeved on the rod body; the two ends of the righting paraffin scraper and the ends of the gear rings have teeth; the circular surfaces of the connectors have recesses 9; the gear rings can be part of the connector entirety or be parts embedded in the connector recesses 9 or fixed on the rod body. The utility model applies to both short-body and long-body sucker rods and has the advantages of righting and paraffin scraping functions, eccentric wear and detachment resistance, reliable safety, long useful life, etc.

Description

A kind of sucker rod of setting upright

The utility model relates to a kind of downhole oil extraction device, specifically a kind of sucker rod.

Oil pumper drives oil well pump by the sucker rod in the oil pipe and pumps from down-hole extraction crude oil, extracts crude oil out ground.Owing to contain compositions such as a large amount of waxes in the crude oil of down-hole, in the process that promotes crude oil, contained wax is easy to be cemented on tube inner wall and the sucker rod, and this has brought resistance, mobile the cause difficulty of oil supply in oil pipe just for moving up and down of sucker rod; Moreover because a lot of oil well is an inclined shaft, moving sucker rod can produce friction with tube inner wall, causes oil pipe, sucker rod, joint, sets upright to scrape and arrange device to wear and tear ...The existence of these problems has all had a strong impact on the production of crude oil, has become to perplex for a long time one of difficult problem of Petroleum Production.On June 23rd, 1999, the Decree of Patent Office of China patented technology (patent No. 98209980.0) of by name " a kind of sucker rod deflection abrasion preventing centralizer ", this centralizer primary structure is: the body of rod (being pipe nipple) is sleeved on body of rod middle part, and mobilizable annular centralizer body; There is tooth at its two ends, and respectively there is a gear ring that is fixed on the body of rod centralizer body both sides, and upper ring gear relies on joint location (being that upper ring gear presses solidly on the body of rod by being connected the joint on the body of rod), and lower ring gear is fixed on the body of rod by pin.Have a plurality of on the surface of centralizer body and the axis inclined notches formed.During use, this centralizer is connected with the sucker rod of above and below by the screw thread at its two ends, and when sucker rod moved up and down in oil pipe, centralizer body also moved up and down and be rotated simultaneously motion; Therefore, can play centralizing function, also can wipe the wax deposition on the tube inner wall off, and because centralizer body when moving up and down certain position sucker rod, can with upper ring gear or lower ring gear interlock mutually, generation rotatablely moves, and can prevent the centralizer body eccentric wear.The maximum weak point of this patented technology is that security reliability is poor, and promptly because joint is by being threaded upper ring gear to be fixed on the body of rod, under the long term of live load, upper ring gear is difficult to be fixed on for a long time and effectively on the body of rod; Fixedly need during lower ring gear on the body of rod, be drilled with cross-drilled hole, thereby slackened the intensity of the body of rod, be easy to generate fatigue fracture.Secondly, be that regular screw threads connect and also are difficult to be fixed together for a long time and effectively between the joint of centralizer and the body of rod, therefore exist the hidden danger of generation case accident; In addition, this technology only can be used for short body sucker rod, is not suitable for long body sucker rod.

The purpose of this utility model is to provide a kind of good function that has: promptly set upright (preventing that sucker rod is crooked), paraffin cutting (preventing tube inner wall, body of rod wax deposition), anti-eccentric wear and the function that comes off, long service life, safe and reliable novel sucker rod.

The utility model is achieved in that sucker rod mainly is made up of the body of rod, joint, gear ring, centering paraffin scraper.There is joint at body of rod two ends, and the body of rod and joint are an integral body.The end of two joints has the internal thread and the external screw thread that are connected usefulness with upper and lower sucker rod respectively.Body of rod middle part suit closed annular centering paraffin scraper, and there is tooth at its two ends; This centering paraffin scraper internal diameter is less than the external diameter of joint, has on its annular surface with axis to be groove less than 60 ° of angles.On the body of rod between centering paraffin scraper and two end joints, fixing a gear ring respectively, gear ring and joint, the body of rod both can be an integral body, also can be two parts, as: the one or more grooves of processing on joint, the part with gear ring embeds in this groove again; Also available plastic or other material is injection molded at this groove; In a word, can reach the firmly purpose of fixed gear ring.And for long body sucker rod, can on a body of rod, one to ten centering paraffin scraper by suit, be connected on the upper and lower body of rod of each centering paraffin scraper one spacing and the guiding usefulness gear ring.During use, when moving on the sucker rod, centering paraffin scraper and upper ring gear are threaded off, and subsequently with the lower ring gear interlock, produce swing offset; When sucker rod moved down, centering paraffin scraper and lower ring gear were threaded off, and with the upper ring gear interlock, can produce swing offset again subsequently; Long this operation can make the paraffin scraper uniform wear, prevents eccentric wear.

The utility model is set upright sucker rod, and owing to the body of rod, joint are an integral body, centering paraffin scraper is enclosed within on the thin body of rod, so centering paraffin scraper can not come off; Because being connected between gear ring and the body of rod is very firm, so can play good location and anti-eccentric wear effect to centering paraffin scraper.The utlity model has good set upright, resultant effects such as paraffin cutting, anti-eccentric wear, slip-off preventing, and safe and reliable, long service life both had been applicable to short body sucker rod, also was applicable to long body sucker rod.

Narrate three embodiment below in conjunction with accompanying drawing:

Accompanying drawing 1, embodiment 1 short body are set upright the sucker rod structural representation;

Accompanying drawing 2, embodiment 2 short bodies are set upright the sucker rod structural representation;

Accompanying drawing 3, embodiment 2 centering paraffin scrapers cooperate schematic cross-section with the body of rod;

Accompanying drawing 4, embodiment 3 long bodies are set upright and are taken out the bar structural representation.

Among the figure, the 1st, top connection, the 2nd, upper ring gear, the 3rd, the body of rod, the 4th, centering paraffin scraper, the 5th, lower ring gear, the 6th, lower contact, the 7th, external screw thread, the 8th, groove, the 9th, groove, the 10th, internal thread.

Embodiment 1, short body are set upright sucker rod, mainly contain the body of rod 3, upper and

lower joint

1,6, centering paraffin scraper 4.Upper and lower joint is positioned at body of rod two ends, and its

joint

1,6 has external screw thread 7 and internal thread 10 respectively.Profile of

tooth gear ring

2,5 is made in joint the inner.Body of rod middle part suit the annular centering paraffin scraper of one two auspicious indentation.The body of rod, upward lower contact, gear ring are an integral body.The long 290mm of the body of rod, two end joint external diameter 41mm, body of rod middle part path 22mm, have on the long 80mm of centering paraffin scraper, external diameter 58mm, internal diameter 23mm, the circumferentia four wide 20mm, dark 8mm, and central axis be the groove 8 at 10 ° of angles, 8 of the end tooth ring numbers of teeth, the long 10mm of tooth.

Embodiment 2, short body are set upright and are taken out bar.Its structure is substantially the same manner as Example 1, difference is: on the surface of upper and

lower termination

1,6, four longitudinal flutings 9 are arranged, wide 10mm, dark 10mm, at groove and, be fixed on

gear ring

2,5 on the termination and the body of rod with plastic injection-moulded one-tenth towards the 25mm place of centering paraffin scraper.

Embodiment 3, long body are set upright sucker rod, and its structure and embodiment 1 or embodiment 2 are basic identical, and difference is: the body of rod 3 long 8000mm; Two centering paraffin scrapers 4 are housed on the body of rod; A spacing knot that firmly is connected with the body of rod is arranged between the centering paraffin scraper or on the body of rod of an end, spacingly tie injection moulding and

gear ring

2,5, spacing knot is used for fixing and limits the motion of gear ring.

Claims

1, a kind of sucker rod of setting upright, mainly by the body of rod (3), the joint (1 at body of rod two ends, 6), movable set is at the annulus scraper (4) of body of rod middle part sealing, gear ring (2 between joint and the centering paraffin scraper, 5) form, the end of joint has internal thread (10) and external screw thread (7) respectively, setting upright to scrape arranges the end of device to be profile of tooth, the tooth of gear ring matches with the tooth of centering paraffin scraper, it is characterized in that: the joint and the body of rod are an integral body, the internal diameter of centering paraffin scraper is less than the external diameter of joint, gear ring and joint can be an integral body, also can be two parts that connect together.

2, according to the said sucker rod of claim 1, it is characterized in that: on the ring surface of joint (1,6), can fluted (9), the part of gear ring (2,5) embeds in the groove.

3, according to the said sucker rod of claim 1, it is characterized in that: can one to ten of pivot bush unit on the body of rod (3) set upright to scrape and arrange device (4), fixing a spacing knot on the body of rod between two adjacent centering paraffin scrapers, gear ring (2,5) is injection-moulded in this spacing tying.

4, according to the said sucker rod of claim 1, it is characterized in that: on the ring surface of centering paraffin scraper (4), groove (8) is arranged, the angle between the groove and the body of rod (3) axis is less than 60 °.