CN201367889Y

CN201367889Y - Embedded bridging fibril sand-protecting sieve tube

Info

Publication number: CN201367889Y
Application number: CNU2009201452886U
Authority: CN
Inventors: 杨艺
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-03-13
Filing date: 2009-03-13
Publication date: 2009-12-23
Anticipated expiration: 2019-03-13

Abstract

An embedded bridging fibril sand-protecting sieve tube comprises a basic pipe and a filtering piece, wherein the filtering piece comprises a filtering core and a protective cover, the filtering core comprises an outer ring and a plurality of bridging fibrils, each of the bridging fibrils comprises a steel wire strip whose cross section is a trapezoid, the bridging fibrils are arranged in the outer ring in interval, two ends of each of the bridging fibrils are fixedly connected with the inner wall of the outer ring, a strengthening rib is further arranged in the outer ring, the strengthening rib intercrosses with the bridging fibrils in a right angle, two ends of the straightening rib are fixedly connected the inner wall of the outer ring, the upper portion of the outer ring is in a tapered shape, the lower portion is in a cylindrical shape, the transition between the upper portion and the lower portion forms an annular boss, the annular boss is clamped on the stepped surface inside a filtering hole, the protective cover covers on the upper portion of the outer ring, and the top surface of the protective cover is provided with a plurality of air windows. The embedded bridging fibril sand-protecting sieve tube of the utility model is characterized in that the filter core comprises a whole part, the size of the filtering gap is stable, the filtration rate is high, the sand baffling precision is high, the sieve tube is not easily plugged, the filtering piece is totally embedded in the basic pipe into a whole through squeezing and expanding, and the sieve tube has very strong rupture resisting ability.

Description

Embedded bridge silk sand control screen

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.

Background technology

At present, oil and gas industry generally adopts sand control screen to carry out the down-hole sand control, sand control screen is made up of parent tube and filter part, the filter part is made up of a plurality of parts, and its shortcoming is a complex structure, the assembling trouble, be not easy the location, intensity is low, the back that is squeezed is yielding, and the size of filter seam is unstable, can not prevent that fine silt, permeability are low, the sand block low precision, easily stop up.

Filter part and parent tube connected mode have two kinds, a kind of be threaded fastening, another kind be weld fastening.The processing technology that is threaded complexity, mashed tooth situation takes place frequently, and leaks tooth probably, and the quality control difficulty is big, and tightness is poor, and recoil strength is poor, and man-hour is many.

Welding fastening is that the filter part directly is welded on the parent tube, and the high temperature during welding is very big to the material property influence of parent tube, and the intensity of parent tube and rigidity are changed, and weld corrodes easily, the weldering phenomenon also may occur leaking, and is manually uncontrollable, the cost height.

The utility model content

For addressing the above problem, the purpose of this utility model provides a kind of embedded bridge silk sand control screen, its filter core is made of the part of an integral body, the size of filter seam is stable, permeability height, sand block precision height, be difficult for stopping up, the filter part is embedded in the parent tube fully by extrusion expansion, and is in aggregates, has extremely strong survivability.

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

A kind of embedded bridge silk sand control screen, is made up of parent tube and filter part, filters part and be contained in the filter bores on the parent tube sidewall, filter bores is a back taper through hole that has step surface, it is characterized in that: described filter part is made up of filter core and over cap, and filter core is made up of outer shroud and a plurality of bridge silk; Each bridge silk is that trapezoidal steel wire bar constitutes by cross section, these bridge silks are spaced apart and arranged in the outer shroud, the two ends of each bridge silk and the inwall of outer shroud are affixed, each bridge silk is parallel to each other, interval between each bridge silk equates, in outer shroud, also be provided with a reinforcing rib, this reinforcing rib at right angles intersects with described bridge silk, the two ends of this reinforcing rib and the inwall of outer shroud are affixed, and the top of described outer shroud is taper, and the bottom is cylindrical, top is big, the bottom is little, and the transition position of upper and lower forms an annular boss, and this annular boss is installed on the interior step surface of described filter bores; The shape of described over cap conforms to the shape on outer shroud top is corresponding; Over cap covers on the top of outer shroud, and the sidewall of over cap becomes tight fit with filter bores, has a plurality of transom windows on the end face of over cap.

The end face of described outer shroud is higher than the end face of each bridge silk.

Described reinforcing rib overlaps with the radial centre lines of outer shroud.

The two ends of described parent tube are provided with screw thread.

The utility model has following positive beneficial effect:

Filter bores on the parent tube is a back taper through hole that has step surface, and the filter part is blended in the parent tube fully by extrusion expansion, and is in aggregates, the extremely strong survivability of filter chamber tool of formation, and tension, antitorque, resistance to compression, bending resistance, anti-squeezing.The filter part is embedded in the filter bores of parent tube fully, and the outside dimension of former parent tube is constant, and therefore the same convenient with well operations under the usual tubing and casing, technology is simple, and cost is low, and the job success ratio height is that the oil gas well is repaiied the more satisfactory sand preventing tool of completion.

Because adopt said structure, big or small uniformity is stitched in the filter of each filter core, each filter is seamed into and is up-narrow and down-wide taper, the sand control capability excellence, and the filter seam is highly polished, and the diafiltration resistance is little, and pressure drop is low, can not cause screen casing to stop up, and fine silt can not assembled in screen casing.

Filter core can be formed by the compacting of high-quality stainless steel material, and therefore the optional special material of special hole condition has abilities such as very strong temperature resistance, antiacid alkali salt corrosion, extensively is adapted to the oil gas well sand control of various geologic features.

Description of drawings

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

Fig. 2 is the exploded view of Fig. 1.

Fig. 3 is the enlarged drawing of filter part among Fig. 2.

Fig. 4 is the upward view of Fig. 3.

Fig. 5 is the half sectional view of Fig. 1.

Fig. 6 is the enlarged drawing of A part among Fig. 5.

Fig. 7 is the exploded view of Fig. 3.

Fig. 8 is the half sectional view of filter core among Fig. 7.

Fig. 9 is the upward view of Fig. 8.

Figure 10 is the exploded view of Fig. 6.

The specific embodiment

Number in the figure

1 parent tube, 2 filter parts, 3 filter cores

4 over caps, 5 transom windows, 6 outer shrouds

7 bridge silks, 8 filter seams, 9 reinforcing ribs

10 box cuplings, 11 screw threads, 12 filter bores

13 tapers, 14 cylindrical 15 annular boss

16 end faces, 17 end faces, 18 step surfaces

19 gas channels

Please refer to Fig. 1, Fig. 2, Figure 10; The utility model is a kind of embedded bridge silk sand control screen, is made up of parent tube 1 and filter part 2, filters part 2 and is contained in the filter bores 12 on the parent tube sidewall, and filter bores 12 is back taper through holes that have step surface 18.

Please refer to Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, filter part 2 is made up of filter core 3 and over cap 4, has a plurality of transom windows 5 on the end face of over cap 4.Filter core 3 is made up of outer shroud 6 and a plurality of bridge silk 7; Each bridge silk 7 is that trapezoidal steel wire bar constitutes by cross section, these bridge silks 7 are spaced apart and arranged in the outer shroud 6, the inwall of the two ends of each bridge silk 7 and outer shroud 6 is affixed, each bridge silk 7 is parallel to each other, interval between each bridge silk 7 equates, gap between the adjacent bridge silk 7 constitutes filter seam 8, filter seam 8 is up-narrow and down-wide conical gap, in outer shroud 6, also be provided with a reinforcing rib 9, reinforcing rib 9 at right angles intersects with bridge silk 7, the inwall of the two ends of reinforcing rib 9 and outer shroud 6 is affixed, and reinforcing rib 9 overlaps with the radial centre lines of outer shroud 6.

Please refer to Fig. 6, Fig. 8, Fig. 9, Figure 10, the top of outer shroud 6 is taper 13, and the bottom is cylindrical 14; Top is big, and the bottom is little, and the transition position of upper and lower forms an annular boss 15, corresponding the conforming to of shape on the shape of over cap 4 and outer shroud 6 tops; Over cap 4 covers on the top of outer shroud 6.The bottom surface of over cap 4 is concordant with annular boss 15, and annular boss 15 is installed on the step surface 18 in the filter bores 12; The outer wall of over cap 4 tightens together by extrusion expansion and filter bores 12.The end face 16 of outer shroud 6 is higher than the end face 17 of each bridge silk 7.Thereby between over cap 4 and bridge silk 7, form gas channel 19.

Owing to adopt said structure, each filter seam 8 becomes up-narrow and down-wide conical gap, each filter seam 8 big or small uniformity, and the sand control capability excellence, the filter seam is highly polished, and the diafiltration resistance is little, and pressure drop is low; Can not cause screen casing to stop up, fine silt can not assembled in screen casing.

The two ends of parent tube 1 are provided with screw thread 11, and screw thread 11 is used for linking to each other with box cupling 10, a plurality of parent tubes 1 can be connected in series by box cupling 10.

Claims

1. embedded bridge silk sand control screen, is made up of parent tube and filter part, filters part and be contained in the filter bores on the parent tube sidewall, filter bores is a back taper through hole that has step surface, it is characterized in that: described filter part is made up of filter core and over cap, and filter core is made up of outer shroud and a plurality of bridge silk; Each bridge silk is that trapezoidal steel wire bar constitutes by cross section, these bridge silks are spaced apart and arranged in the outer shroud, the two ends of each bridge silk and the inwall of outer shroud are affixed, each bridge silk is parallel to each other, interval between each bridge silk equates, in outer shroud, also be provided with a reinforcing rib, this reinforcing rib at right angles intersects with described bridge silk, the two ends of this reinforcing rib and the inwall of outer shroud are affixed, and the top of described outer shroud is taper, and the bottom is cylindrical, top is big, the bottom is little, and the transition position of upper and lower forms an annular boss, and this annular boss is installed on the interior step surface of described filter bores; The shape of described over cap conforms to the shape on outer shroud top is corresponding; Over cap covers on the top of outer shroud, and the sidewall of over cap becomes tight fit with filter bores, has a plurality of transom windows on the end face of over cap.

2, embedded bridge silk sand control screen as claimed in claim 1, it is characterized in that: the end face of described outer shroud is higher than the end face of each bridge silk.

3, embedded bridge silk sand control screen as claimed in claim 1, it is characterized in that: described reinforcing rib overlaps with the radial centre lines of outer shroud.

4, embedded bridge silk sand control screen as claimed in claim 1, it is characterized in that: the two ends of described parent tube are provided with screw thread.