CN2276557Y - Kerf sieve tube with curve, fold-line type crack - Google Patents

Abstract

The utility model belongs to a device for oil extraction equipment. The new seam type of the kerf sieve tube of the scheme is proposed for overcoming the problem of small over-current area of a straight seam and the existing processing problems of the trapezoidal seams in the existing technologies. The device comprises the curve seam and the fold line seam which have rectangular sections and the curve seam and the fold line seam which have trapezoidal sections. The minimum seam is 0.1 to 2 mm, the total over-current area occupies 10 to 20 percent of the external surface of the kerf sieve tube, and the trapezoid angle is 0 to 40 DEG. Compared with the existing straight seam, the utility model is characterized in relative big over-current area, high size precision, low cost, etc.

Description

The cutting seam sieve tube of curve, broken line groove part

The utility model belongs to a kind of device in completion and the oil production equipment, and it is specifically related to the structure in a kind of novel cutting seam sieve tube slit.

Screen casing is that oil well, gas advance the underground pipeline that completion and oil recovery sand control are used, its requires to have higher productivity ratio is that the area of passage in slit is big, also require to have the performance that prevents that sand grains from passing through, therefore the section configuration to size, distribution situation and the slit of having done the slit on pipe all has strict requirement.Early stage screen casing adopts the structure of wrapping wire, it is with the uniform one-tenth tubular of stainless reinforcing bar, on top presses certain interval winding stainless steel wire and welding and fixes, and forms and sieves the shape pipe, its subject matter be under when managing owing to the borehole wall extruding and friction take place, be prone to the sleave phenomenon.This screen casing has the low problem of expense high-quality, can not satisfy the operation technique requirement of vast oil gas field, a kind of screen casing has appearred again in recent years, promptly on the steel pipe body, cut out finedraw by certain regularity of distribution, can replace wire-wrapped screen in the past with this form, quality stability is greatly improved, but on processing technology and equipment, be very limited, common processing method is to adopt thin ceramic tip cutting at present, because of the cutter life weak point exists the low high problem of processing cost of production efficiency, and can only the cutting straight line seam.Practical studies through using department finds that the curve seam is sewed with bigger area of passage than straight line, in the use of oil gas field, can improve output, in addition, find that also the slit section is trapezoidal, significantly " self-cleaning " effect is arranged, the wide seam less than inner surface of tube of seam that is outer tube surface is wide, and it can not blocked by sand grains and reduce productivity ratio.Aforesaid curve seam cuts not come out with the sheet cutter at all, obtains the patent document of being correlated with by retrieval about the problem of trapezoidal seam: 1. CN213630 " keystone cut screen casing "; 2. CN1060136 " cutting seam sieve tube and manufacture method thereof ", this two patent document is two pieces of patents that same applicant applies for simultaneously, it has proposed the structure of trapezoidal seam, but it is a straight line dovetail groove of leaving large-size on body earlier, in vat, be bumped into stick again, and welding is fixing, can be formed on the trapezoidal seams or both sides of inserting on one side, its problem is that processing capacity is big and required precision is high, the size of trapezoidal seam and precision thereof will be determined by welding sequence, difficulty is too big, and is bumped into large batch of stick on pipe in enormous quantities, and this kind scheme is difficult to realize; 3. CN2347343 " oil recovery gas production with combination narrow slit screen casing ", the seam type that its proposes is the straight line seam, its section is the combination of narrow slit and conic section, or the combination of narrow slit and trapezoid cross section.This is structurally complicated, is difficult to realize with general technological method for processing, therefore lacks practical significance.The trapezoidal seam of aforesaid relevant patent all is linear, about the trapezoidal seam of curve or broken line type beyond example still.

The purpose of this utility model is the special this programme that proposes of actual processing problems that overcomes screen casing cathetus seam less easy formation sand plug of area of passage and the trapezoidal seam existence of aforesaid straight line.It is the new seam type that realizes the trapezoid cross section seam with special-purpose laser slotted machine, it have area of passage big, can " self-cleaning ", easily processing, precision height and the low characteristics of cost.

By as above design, the cutting seam sieve tube of the curve that this programme proposed, broken line groove part includes the tubing of metal material, and to have many cross sections on body be rectangle or trapezoidal narrow slit, its concrete feature is: the surface configuration of its rectangular slits is curve or broken line, and the surface configuration of trapezoidal seam is curve or broken line.

Each bar narrow slit distribution arrangement can be the generatrix direction along the face of cylinder in this programme, also can be on the face of cylinder perpendicular to generatrix direction or favour generatrix direction, the wide minimum dimension of its rectangular slits or trapezoidal seam seam is between 0.1-2mm, and its wide area of passage of crack accounts for the 10-20% of screen casing exterior surface area.The angle of trapezoidal seam two hypotenuses is between 0 °-40 °.

Adopt this programme can embody following superiority: 1. to strengthen than the length that straight line stitches, bigger area of passage is arranged, in the use of oil gas field, can improve output at same distribution length upper curve seam or broken line seam; 2. the trapezoidal seam of curve of this screen casing or broken line rectangular slits and curve or broken line is to process on the laser slotted machine of special use, owing to can do complicated resultant motion between workpiece and the laser beam, can easily process aforesaid seam type, and precision height, because of laser slotted speed higher, so its production efficiency height, processing cost is low; 3. the cutting seam sieve tube of this programme can be made in enormous quantities for promoting the use of.

Fig. 1 is the cutting seam sieve tube schematic diagram of shaped form.

Fig. 2 is the cutting seam sieve tube schematic diagram of broken line type.

Fig. 3 is the schematic diagram in the cross section of square groove part.

Fig. 4 is the schematic diagram in the cross section of ladder type seam.

The embodiment of existing accompanying drawings this programme.

1, the curve of square-section seam, surface configuration as shown in Figure 1, cross sectional shape is as shown in Figure 3.

2, the broken line of trapezoid cross section seam, surface configuration as shown in Figure 2, cross sectional shape is as shown in Figure 4.

3, the curve of trapezoid cross section seam, surface configuration as shown in Figure 1, cross sectional shape is as shown in Figure 4.

The rectangle of this product or the minimum width dimension of trapezoidal seam can be between 0.1-2mm, and its concrete condition is selected by the geology state and the sand grains situation in oil field, and the wide machining accuracy of its seam can be controlled in ± 0.05mm slit cuts surface roughness Ra≤6.3 μ m.The angle of trapezoidal seam can make between 0 °-40 °.Pipe range is a 3-12 rice, and external diameter is between Φ 50-350mm, and wall thickness is 2-10mm.The distribution situation in each slit can be parallel distribution, also can be to be interspersed or the distribution of spiral form.

Claims (4)

1, the cutting seam sieve tube of a kind of curve, broken line groove part, it includes the tubing of metal material, and to have many cross sections on body be rectangle or trapezoidal narrow slit, and the surface configuration that it is characterized in that its rectangular slits is curve or broken line, and the surface configuration of trapezoidal seam is curve or broken line.

2, according to the described cutting seam sieve tube of claim 1, it is characterized in that each bar narrow slit distribution arrangement can be the generatrix direction along the face of cylinder, also can be along the face of cylinder perpendicular to generatrix direction or favour generatrix direction.

3, according to the described cutting seam sieve tube of claim 1, it is characterized in that the wide minimum dimension of this rectangular slits or trapezoidal seam seam between 0.1-2mm, its wide area of passage of crack accounts for the 10-20% of screen casing exterior surface area.

4, according to the described cutting seam sieve tube of claim 1, the angle of trapezoidal seam two hypotenuses that it is characterized in that it is between 0 °-40 °.

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