CN201176868Y

CN201176868Y - Circular ring seam sand preventing screen pipe

Info

Publication number: CN201176868Y
Application number: CNU2008201079650U
Authority: CN
Inventors: 林咸银; 陈虎
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-28
Filing date: 2008-03-28
Publication date: 2009-01-07
Anticipated expiration: 2018-03-28

Abstract

The utility model relates to a circular seam sand control screen, which consists of a collar, a parent tube and a filter element, wherein the collar is connected to the end part of the parent tube through threads; the filter element consists of a central cap, a plurality of filter rings and a retainer ring; inside diameters of various filter rings are progressively increased in turn from the inside to the outside; the filter rings are embedded with each other in the same axle center; an outmost filter ring is embedded into the retainer ring; the central cap is embedded into an inmost filter ring; adjacent filter rings are in a form of clearance fit; the central cap and the inmost filter ring are in the form of clearance fit; the outmost filter ring and the retainer ring are in the form of clearance fit; the filter element is embedded into a circular hole on the sidewall of the parent tube; and a protective cover is covered on the surface of the filter element. The product of the circular seam sand control liner has large strength, high precision, narrow slit clearance, wide sand prevention range, large infiltrating area, long service life and convenient lowering operation, is abrasion resistant, high-temperature resistant and corrosion resistant, is difficult to block, has the efficacy of independent blockage relieving, and is a current ideal sand control device for a workover well of an oil gas well.

Description

Sand control screen with circular seam

Technical field

The utility model relates to the mechanical sand retention device that uses in the petroleum industry oil extraction, specifically a kind of sand control screen with circular seam.

Background technology

At present, the mechanical sand retention device of petroleum industry oil extraction mainly contains cutting seam sieve tube, wire-wrapped screen and wire lath or the compound screen casing of metallic fiber etc.

Cutting seam sieve tube is to be shaped by laser cutting, and minimum slot width is 0.25mm, so it is restricted the sand control of powder fine sand, and easily by the corrosion of the adverse circumstances of down-hole, not wear-resisting, application life is short.

Wire-wrapped screen is formed by the stainless steel wire coiling, and complex process, time-consuming expense money, cost height, intensity are low, low precision, the operational difficulty of going into the well, damage easily.

The compound screen casing of wire lath or metallic fiber easily stops up, and intensity is low, and the outsourcing footpath is big, and precision is low, and damaged easily, application life is short.

The utility model content

For addressing the above problem, the purpose of this utility model provides a kind of sand control screen with circular seam, and its intensity is big, the precision height, wear-resisting, high temperature resistant, anticorrosive, it is very narrow that the slit gap can be done, the sand control scope is wide, infiltrating area is big, is difficult for stopping up and having from de-plugging effect, long service life, the Job Operations of going into the well is convenient, is that present oil gas well is repaiied the comparatively ideal sand control installation of completion.

For achieving the above object, the utility model is by the following technical solutions:

A kind of sand control screen with circular seam, by box cupling, parent tube, filter core is formed, box cupling is by being threaded in the end of parent tube, it is characterized in that: described filter core is by a center cap, several filtering rings, a retainer ring is formed, the internal diameter size of described each filtering ring increases progressively from inside to outside successively, the coaxial heart of these filtering rings nests together, outermost filtering ring is nested in the retainer ring, center cap is nested in the most inboard filtering ring, it between the adjacent filtering ring matched in clearance, between center cap and the most inboard filtering ring is matched in clearance, is matched in clearance between outermost filtering ring and the retainer ring; Described filter core is inlaid in the circular hole on the parent tube sidewall, is covered with over cap on the cartridge surface.

The shape of described each filtering ring is identical, the outer wall of each filtering ring is stepped that top is big, the bottom is little, the top of filtering ring outer wall is the conical surface, the bottom of filtering ring outer wall is a cylinder, each filtering ring all has stepped hole, circumferentially is evenly equipped with several slotted eyes or groove on the step surface of stepped hole, and the outer wall of described center cap is stepped that top is big, the bottom is little, the top of center cap outer wall is the conical surface, and the bottom of center cap outer wall is a cylinder.

Circular hole on the described parent tube sidewall is a shoulder hole.Described over cap is welded in the circular hole on the parent tube sidewall.The outside dimension scope of described retainer ring is 10-50mm, and the height dimension scope of retainer ring is 1-15mm.The quantitative range of described filtering ring is 2-10.

The utility model has following positive beneficial effect:

One, the filter core profile of this product is cylindrical, the inlaid hole that cooperates with it on the parent tube is a circular hole, intensity height than straight trough hole and slot groove, thereby body more can bear the extrusion stress that causes because of cave-in or undergauge, the flat ability of critical external compressive resistance is strong, filter core is made up of the ring stainless steel parts nest, the rigidity height, and anti-extrusion ability is strong.

Two, filter core is made up of a plurality of ring stainless steel parts nest, and the slit gap between adjacent two parts is an annular, and assembling is located easily, the precision height of cooperation, and error is little.

Three, filter core and over cap are made by 304/316 stainless steel, thereby wear-resisting, high temperature resistant, anticorrosive.

Four, filter core is made up of a plurality of ring stainless steel parts nest, the slit gap is by the size decision of the internal diameter and the external diameter of two adjacent parts, and the size of the internal diameter of parts and external diameter can be processed arbitrarily, therefore, the slit gap can in very large range be adjusted, and that both can do is very wide, and that also can do is very narrow, the scope in slit gap can be 0.01-0.5mm, thereby the sand control scope is wide.

Five, the filter core of this product is made up of a plurality of concentric annulus, connects with one another closely, and circumferential weld is intensive, and week stitches long, therefore, and the permeability height.

Six, the slit gap can be made of the conical surface, outer narrow inner width, and for tubaeform, therefore, fluid is easy to by the slit gap, is difficult for stopping up and having from de-plugging effect, long service life.

Seven, the filter core profile of this product is cylindrical, is embedded in the circular hole on the parent tube, does not have the outsourcing footpath, and is identical with former parent tube or tubing and casing specification, therefore the same with well operations under the tubing and casing convenient, is that present oil gas well is repaiied the comparatively ideal sand control installation of completion.

Description of drawings

Fig. 1 is the structural representation of the utility model one embodiment.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Fig. 3 is the exploded view of Fig. 2.

Fig. 4 is the enlarged drawing of filter core among Fig. 3.

Fig. 5 is the upward view of Fig. 4.

Fig. 6 is the exploded view of Fig. 4.

Fig. 7 is the exploded view of Fig. 6.

Fig. 8 is the structural representation of filter core embodiment two.

Fig. 9 is the sectional view of filter core shown in Figure 4.

Figure 10 is the structural representation of filter core embodiment three.

Figure 11 is the exploded view of Fig. 9.

Figure 12 is that filter core is fixed on the structural representation on the parent tube sidewall circular hole.

The specific embodiment

Number in the figure

1 box cupling, 2 parent tubes, 3 filter cores, 4 center caps

401 conical surfaces, 402 cylinders, 5 filtering rings, 501 conical surfaces

502 cylinders, 503 shoulder holes, 504 slotted eyes, 505 grooves

6 filtering rings, 601 conical surfaces

602 cylinders, 603 shoulder holes, 604 slotted eyes, 605 grooves

7 filtering rings, 704 slotted eyes

8 retainer rings, 803 shoulder holes, 804 slotted eyes, 805 grooves

9 slit gaps, 10 over caps, 11 meshes

12 external screw threads, 13 circular holes

Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, the utility model is a kind of sand control screen with circular seam, is made up of box cupling 1, parent tube 2, filter core 3, and there is external screw thread 12 at the two ends of parent tube 2.Box cupling 1 is connected by the end of internal thread with parent tube 2.

Be covered with circular hole 13 on the sidewall of parent tube 2, be embedded with a filter core 3 in each circular hole 13, be covered with over cap 10 on the surface of filter core 3.

Please refer to Fig. 4, Fig. 6, have mesh 11 on the over cap 10, so that fluid enters in the filter core 3.

Please refer to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Figure 11, filter core 3 is nested by center cap 4, two

filtering rings

5,6 and retainer ring 8 and forms, and the shape of two

filtering rings

5,6 is identical.

The outer wall of filtering ring 5 is stepped that top is big, the bottom is little, and the top of filtering ring 5 outer walls is the conical surface 501, and the bottom of filtering ring 5 outer walls is a cylinder 502, and filtering ring 5 has stepped hole 503, circumferentially is evenly equipped with several slotted eyes 504 on the step surface of stepped hole 503.

Slotted eye 504 also can be a groove 505 shown in Figure 8.

The outer wall of filtering ring 6 is stepped that top is big, the bottom is little, and the top of filtering ring 6 outer walls is the conical surface 601, and the bottom of filtering ring 6 outer walls is a cylinder 602, and filtering ring 6 has stepped hole 603, circumferentially is evenly equipped with several slotted eyes 604 on the step surface of stepped hole 603.

Slotted eye 604 also can be a groove 605 shown in Figure 8.

The outer wall of center cap 4 is stepped that top is big, the bottom is little, and the top of center cap 4 outer walls is the conical surface 401, and the bottom of center cap 4 outer walls is a cylinder 402, and center cap 4 is nested in the stepped hole 503 of filtering ring 5.

The internal diameter size of filtering ring 6 is slightly larger than the outside dimension of filtering ring 5, and filtering ring 5 is nested in the stepped hole 603 of filtering ring 6.

Retainer ring 8 has stepped hole 803, circumferentially is evenly equipped with several slotted eyes 804 on the step surface of stepped hole 803.

Slotted eye 804 also can be a groove 805 shown in Figure 8.

Filtering ring 6 is nested in the stepped hole 803 of retainer ring 8.The outside dimension scope of retainer ring 8 is 10-50mm, and the height dimension scope of retainer ring 8 is 1-15mm.

Please refer to Fig. 6, Fig. 9, be matched in clearance between center cap 4 and the filtering ring 5, be matched in clearance between filtering ring 5 and the filtering ring 6, be matched in clearance between filtering ring 6 and the retainer ring 8, and the fitting face between each parts is the conical surface, thus the slit gap 9 of narrow inner width outside between two adjacent parts, forming, therefore, fluid is easy to be difficult for stopping up and having from de-plugging effect, long service life by, slit gap 9.

The quantitative range of filtering ring is 2-10.Please refer to Figure 10, in the embodiment shown in fig. 10, the filtering ring that constitutes filter core has three, be respectively filtering ring 5, filtering ring 6, filtering ring 7, the internal diameter size of these three filtering rings increases successively, and filtering ring 5 is nested in the stepped hole of filtering ring 6, and filtering ring 6 is nested in the stepped hole of filtering ring 7, filtering ring 7 is nested in the stepped hole of retainer ring 8, and center cap 4 is nested in the stepped hole of filtering ring 5.

Please refer to Figure 12, over cap 10 is welded in the circular hole 13 of parent tube 2 sidewalls.Circular hole 13 is a shoulder hole, and the bottom surface of filter core 3 is spacing by the cascaded surface of circular hole 13, and the end face of filter core 3 is spacing by over cap 10.

Claims

1, a kind of sand control screen with circular seam, by box cupling, parent tube, filter core is formed, box cupling is by being threaded in the end of parent tube, it is characterized in that: described filter core is by a center cap, several filtering rings, a retainer ring is formed, the internal diameter size of described each filtering ring increases progressively from inside to outside successively, the coaxial heart of these filtering rings nests together, outermost filtering ring is nested in the retainer ring, center cap is nested in the most inboard filtering ring, it between the adjacent filtering ring matched in clearance, between center cap and the most inboard filtering ring is matched in clearance, is matched in clearance between outermost filtering ring and the retainer ring; Described filter core is inlaid in the circular hole on the parent tube sidewall, is covered with over cap on the cartridge surface.

2, sand control screen with circular seam as claimed in claim 1, it is characterized in that: the shape of described each filtering ring is identical, the outer wall of each filtering ring is stepped that top is big, the bottom is little, the top of filtering ring outer wall is the conical surface, the bottom of filtering ring outer wall is a cylinder, each filtering ring all has stepped hole, circumferentially be evenly equipped with several slotted eyes or groove on the step surface of stepped hole, the outer wall of described center cap is stepped that top is big, the bottom is little, the top of center cap outer wall is the conical surface, and the bottom of center cap outer wall is a cylinder.

3, sand control screen with circular seam as claimed in claim 1 is characterized in that: the circular hole on the described parent tube sidewall is a shoulder hole.

4, sand control screen with circular seam as claimed in claim 1 is characterized in that: described over cap is welded in the circular hole on the parent tube sidewall.

5, sand control screen with circular seam as claimed in claim 1 is characterized in that: the outside dimension scope of described retainer ring is 10-50mm, and the height dimension scope of retainer ring is 1-15mm.

6, sand control screen with circular seam as claimed in claim 1 is characterized in that: the quantitative range of described filtering ring is 2-10.