CN101806204B

CN101806204B - Straight slit trapezoidal self-cleaning screen pipe

Info

Publication number: CN101806204B
Application number: CN2010101792368A
Authority: CN
Inventors: 杨经贵; 陈虎; 黄和木
Original assignee: ZHEJIANG XINGJU TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG XINGJU TECHNOLOGY Co Ltd
Priority date: 2010-05-21
Filing date: 2010-05-21
Publication date: 2012-05-23
Anticipated expiration: 2030-05-21
Also published as: CN101806204A

Abstract

The invention relates to a straight slit trapezoidal self-cleaning screen pipe which comprises a base pipe and a filter piece; the filter piece is arranged in a filter hole on the side wall of the base pipe, and comprises a filter element and a protective cover; the filter element comprises an upper fixing ring, a lower fixing ring and a plurality of trapezoidal filter strips; the filter strips are arranged between the upper and the lower fixing rings with equal spacing; the top of each filter strip is a plane, the bottom thereof is a circular arc-shaped surface, and both sides thereof are inclined surfaces which are folded inwards symmetrically; the top of the front end and the rear end of each filter strip are fixedly connected on the bottom surface of the upper fixing ring by hot pressing, and the bottom thereof is fixedly connected on the top surface of the lower fixing ring; and the protective cover is covered at the upper part of the filter element, the protective cover is screwed on the inner wall of the filter hole through an external-threaded screw thread, and the top surface of the protective cover is provided with a through hole. The self-cleaning screen pipe has the advantages of simple assembly, easy manufacturing, small difficulty in construction operation, trapezoidal straight filter joint, appropriate joint size, high permeability, high sand blocking precision, no easy blockage, automatic blockage removal capability and long service life.

Description

Straight slit trapezoidal self-cleaning screen pipe

Technical field

The present invention 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, various sand control equipments commonly used at present, and often sand control is too short effective period, and operating cost is expensive.From cutting seam sieve tube, wire-wrapped screen early; To recent miscellaneous compound screen casing, expandable screen; The cutting seam sieve tube filtration area is little, seam is roomy, and permeability is low, and wire-wrapped screen intensity difference, application life lack; Big, the compound screen casing filtering accuracy of construction operation difficulty is poor, be prone to stop up, intensity is not high, and the expandable screen operating cost is expensive, filtering accuracy is poor, also be prone to stop up.

Summary of the invention

For addressing the above problem, the purpose of this invention is to provide a kind of straight slit trapezoidal self-cleaning screen pipe, assembling is simple, is easy to make; The construction operation difficulty is little, and the filter seam is trapezoidal vertical masonry joint, and gap size is suitable, and permeability is high; The sand block precision is high, is difficult for stopping up, and has from de-plugging ability, long service life.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

A kind of straight slit trapezoidal self-cleaning screen pipe is made up of parent tube and filter part, and the filter part is contained in the filtering holes on the parent tube sidewall, and the filter part is made up of filter core and over cap, and it is characterized in that: said filter core is made up of upper and lower retainer ring and the trapezoidal filtering rod of Duo Gen; These filtering rods equally spaced are arranged between the upper and lower retainer ring; The top of every filtering rod is the plane; The bottom is an arc surface, and both sides are the inwardly symmetrical inclined-plane that draws in, and the top of the forward and backward termination of every filtering rod all hot pressing is fixed on the bottom surface of retainer ring; The bottom of the forward and backward termination of every filtering rod all hot pressing is fixed in down on the end face of retainer ring; Over cap covers on the top of filter core, and over cap is screwed onto through the external screw thread screw thread on the inwall of filtering holes, has through hole on the end face of over cap.

The present invention has following positive beneficial effect:

Interval between each trapezoidal filtering rod equates that the slit between the adjacent filtering rod constitutes the filter seam, and the filter seam is up-narrow and down-wide trapezoidal seam, the big or small uniformity of each filter seam; Sand control capability is excellent, because the bottom of filtering rod is an arc surface, the outlet of filter seam becomes the outer bell mouth expanding of circular arc; It is more superior to extend out bell-mouthed performance than pointed shape, because the osmotic resistance of circular arc is little, pressure drop is low; Fluid is easy to through the filter seam, is difficult for stopping up, having from de-plugging effect, long service life.It is all very smooth and easy during through parent tube with axial flow that the fine silt Radial Flow is passed filter seam, can in filter seam or parent tube, not assemble, and can not cause the screen casing obstruction.

Filter core adopts trapezoidal stainless steel strand and upper and lower retainer ring hot pressing fusion moulding or steel plate machine-shaping, makes with extra care moulding, merges the influence that intensity can be resisted oil gas down-hole high temperature, burn into impulse force fully.Therefore the optional special material of special hole condition has abilities such as very strong temperature resistance, antiacid alkali salt corrosion, and suit is in the oil gas well sand control of various geologic features.

Description of drawings

Fig. 1 is the structural representation of one embodiment of the invention.

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

Fig. 3 is the half sectional view of Fig. 1.

Fig. 4 is the local enlarged drawing of A of Fig. 3.

Fig. 5 is the exploded view of filter part.

Fig. 6 is the half sectional view of filter core.

Fig. 7 is the rear elevation of Fig. 6.

Fig. 8 is the sectional view of filter core.

Fig. 9 is the sectional view of filter core.

The specific embodiment

Label among the figure

1 parent tube, 2 filter parts, 3 filtering holes

4 step surfaces, 5 filter cores, 6 over caps

9 times retainer rings of retainer ring on 7 through holes 8

10 filtering rods, 11 planes, 12 arc surfaces

14 inclined-planes, 13 inclined-planes, 15 filter seams

16 external screw thread screw threads, 17 thread heads, 18 box cuplings

The outer bell mouth expanding of outer bell mouth expanding 20 pointed shape of 19 circular arcs

Please with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4; The present invention is a kind of straight slit trapezoidal self-cleaning screen pipe, is made up of parent tube 1 and filter part 2, and filter part 2 is installed in the filtering holes 3 on parent tube 1 sidewall, and filtering holes 3 is circular holes that have step surface 4.

Please with reference to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, filter part 2 is made up of filter core 5 and over cap 6, has a plurality of through holes 7 on the end face of over cap 6.

Filter core 5 is made up of upper and

lower retainer ring

8,9 and Duo Gen filtering rod 10; Filtering rod 10 can be made up of the steel wire bar; These filtering rods 10 equally spaced are arranged on upper and lower retainer ring 8, between 9; The top of filtering rod 10 is plane 11, and the bottom is an arc surface 12, and both sides are the inwardly symmetrical inclined-

plane

13,14 that draws in; The top of the forward and backward termination of every filtering rod 10 all hot pressing is fixed on the bottom surface of retainer ring 8; The bottom of the forward and backward termination of every filtering rod 10 all hot pressing is fixed in down on the end face of retainer ring 9, and over cap 6 covers on the top of filter core 5, and over cap 6 is screwed onto on the inwall of filtering holes 3 through external screw thread screw thread 16.

Interval between each filtering rod 10 equates that the slit between the adjacent filtering rod 10 constitutes filter seam 15, and filter seam 15 is up-narrow and down-wide trapezoidal seam.

Each filter seam 15 big or small uniformity, sand control capability is excellent, because the bottom of filtering rod 10 is an arc surface 12; The outlet of filter seam 15 becomes the outer bell mouth expanding 19 of circular arc, and is more superior than the performance of the outer bell mouth expanding 20 of pointed shape shown in Figure 9, because the osmotic resistance of circular arc is little; Pressure drop is low; Fluid is easy to through filter seam 15, is difficult for stopping up, having from de-plugging effect, long service life.It is all very smooth and easy through parent tube 1 with axial flow that the fine silt Radial Flow is passed filter seam 15, can in filter seam 15 or parent tube 1, not assemble, and can not cause screen casing to stop up,

The two ends of parent tube 1 are provided with thread head 17, and thread head 17 is used for linking to each other with box cupling 18, can a plurality of parent tubes 1 be connected in series through box cupling 18.

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, and suit is in the oil gas well sand control of various geologic features.

Claims

1. a straight slit trapezoidal self-cleaning screen pipe is made up of parent tube and filter part, and the filter part is contained in the filtering holes on the parent tube sidewall, and the filter part is made up of filter core and over cap, and it is characterized in that: said filter core is made up of upper and lower retainer ring and the trapezoidal filtering rod of Duo Gen; These filtering rods equally spaced are arranged between the upper and lower retainer ring; The top of every filtering rod is the plane; The bottom is an arc surface, and both sides are the inwardly symmetrical inclined-plane that draws in, and the top of the forward and backward termination of every filtering rod all hot pressing is fixed on the bottom surface of retainer ring; The bottom of the forward and backward termination of every filtering rod all hot pressing is fixed in down on the end face of retainer ring; Over cap covers on the top of filter core, and over cap is screwed onto through the external screw thread screw thread on the inwall of filtering holes, has through hole on the end face of over cap.