CN213205636U - Variable-precision wire-wound sieve tube - Google Patents

Abstract

The variable-precision wire-wound sieve tube comprises a coupling, a central tube, an upper end ring, a lower end ring, a lateral-flow outer protective sleeve, a wire winding and a supporting longitudinal rib, wherein the coupling and the central tube are connected with a matched well entry tool through screw threads, the supporting longitudinal rib is welded on the central tube, the wire winding is welded with the supporting longitudinal rib, the lateral-flow outer protective sleeve covers the outside of the wire winding, and the upper end ring and the lower end ring are welded on the central tube. The utility model discloses a become precision wire-wrapped screen pipe when keeping its sand blocking performance, can maximize screen pipe seepage flow area again, have the significance to improving the oil well productivity, application prospect is wide.

Description

Variable-precision wire-wound sieve tube

Technical Field

The utility model relates to a wire-wrapped screen pipe for sand control of an independent screen pipe, in particular to a variable-precision wire-wrapped screen pipe.

Background

The wire-wrapped screen pipe has the advantages of high overall strength, good filtering performance, good erosion and corrosion resistance and wide application range, and occupies an important position in the well completion of the independent screen pipe.

The basic structure of the wire-wrapped screen pipe comprises a central perforated base pipe, a support longitudinal bar, a stainless steel wire wrap welded on the support bar and an outer protective sleeve. The screen seam formed by the wire-wound screen pipe is of a trapezoidal structure, the outer part is small, the inner part is large, and the blocking of formation sand can be effectively avoided. However, for the long perforation well section, the adopted screen gaps have consistent sand blocking precision, the difference of formation sand distribution caused by gravity settling is not considered, the precision selection is too small, the flow area of the screen pipe is reduced, and the oil well yield is damaged. For solving the problem, the utility model designs a become precision wire-wrapped screen pipe, wire-wrapped screen seam top-down crescent when reaching the sand control purpose, the seepage flow area that can maximize the screen pipe to improve the productivity of oil well.

In the prior art, CN2632314Y discloses a trapezoid slotted screen pipe, which belongs to an oil well sand control downhole tool and can solve the problems of easy blockage and non-corrosion resistance of sand filters such as wire-wound screen pipes, and the trapezoid slotted screen pipe comprises an upper joint, a sand control pipe and a lower joint which are connected in sequence, wherein the wall of the sand control pipe is provided with a sand-filtering oil-permeating channel, the sand-filtering oil-permeating channel consists of a square through hole and a trapezoid channel, the square through hole is arranged at the periphery of the pipe wall, the trapezoid channel is arranged at the inner periphery of the pipe wall, the sand-preventing oil-permeating channel of the trapezoid slotted screen pipe is in a trapezoid shape, the size of the sand-filtering oil-permeating channel is small and large, therefore, after formation sand of a certain size enters the channel, the formation sand can be smoothly transported into a shaft along with crude oil under the suction action force of an oil pump and is conveyed to the ground, the self-cleaning of the screen pipe is realized, the blockage of the sand control pipe is effectively avoided, and the, the strength is high, the flow area is large, and the problems of difficult fishing, easy delamination and the like are avoided. Compared with other sand control screen pipes, the sand control performance is better, the effective period is longer, and the popularization and the application are easier.

CN204419137U discloses a novel wire-wrapped screen pipe, which has a pipe joint, a vertical support frame is arranged below the pipe joint, a plurality of annular wires are wrapped on the support frame, gaps are arranged between the wires, the outer sides of the wires are arc-shaped, and the upper and lower surfaces of the wires are downward inclined. Above-mentioned wire-wound sieve tube simple structure, the outside of wire-wound is the circular arc type can prevent that the sand grain from blocking, and the upper and lower face of wire-wound all is the downward sloping form and can makes absorbent sand grain easily drop when the back flush, the utility model discloses increase of service life more than 1.6 times, the jam rate reduces more than 30%, improves production efficiency 40-45%.

CN208380555U discloses a sand-proof wire-wrapped screen pipe, which comprises a base pipe, an upper retaining ring, a wire-wrapped, ribs and a lower retaining ring, wherein screen holes are arranged on the base pipe, the ribs are uniformly distributed on the outer surface of the base pipe and are welded into a whole, the wire-wrapped is wrapped outside the ribs and is welded into a whole, the upper end of the wire-wrapped is positioned on the screen hole at the uppermost end of the base pipe, the lower end of the wire-wrapped is positioned below the screen hole at the lowermost end of the base pipe, so that the screen holes on the base pipe are completely covered by the wire-wrapped, the upper retaining ring is sleeved at the upper end of the wire-wrapped and is welded on the base pipe, the lower retaining ring is sleeved at the lower end of the wire-wrapped and is welded on the base pipe, the wire-wrapped and the base pipe are firmly connected into a whole, the flow area is not affected, the base pipe can not fall off from the base pipe when the wire is salvaged, the problems of the prior art are, the oil well can continue normal production and has obvious economic benefit.

CN209040815U discloses a novel wire winding screen pipe, including parent tube, wire winding screen pipe, the wire winding screen pipe is located the parent tube outside, be equipped with the hole on the parent tube, the wire winding screen pipe includes brace rod, wire winding, brace rod quantity is a plurality of, the brace rod interval sets up and is cylindrically, the wire winding is trapezoidal wire winding, trapezoidal wire winding is at cylindrical inner wall and outer wall continuous winding, trapezoidal wire winding is at cylindrical inner wall and outer wall cross winding, the parent tube with be equipped with the metal mesh layer between the wire winding screen pipe. Be equipped with the multilayer sand control, can effectively block tiny gravel.

CN109954817A discloses a forming method of a wire-wrapped screen pipe and a forming device of the screen pipe wire-wrapped, which form a wire-wrapped boss on the side surface of the wire-wrapped in advance before the wire-wrapped winding of the base pipe of the screen pipe, so that when the wire-wrapped is wound, the side elevation of the wire-wrapped boss of the wire-wrapped is tightly attached to the side surface of the adjacent wire-wrapped or the side elevations of the two adjacent wire-wrapped bosses are tightly attached, and the gap between the wire-wrapped of the screen pipe is limited by the wire-wrapped boss, therefore, the high-precision wire-wrapped screen pipe can be realized by using numerical control equipment with common precision grade under the condition of ensuring the precision of the wire-.

CN110617035A discloses a multistage sand control device for natural gas hydrate reservoir, which uses a wire-wrapped screen pipe, and the sand control comprises the following processes: (1) firstly, a large-size drill bit is adopted to drill a target layer to form a main borehole, and then a small-size drill bit is adopted to drill a plurality of branch boreholes in the target layer; (2) placing the single-body metal cotton sand screen into the branch well bore, and placing the single-body metal cotton sand screen at the production interval section in the well; (3) lowering the wire-wrapped screen pipe into the sand prevention interval section in the well, filling fluid carrying gravel well selected from the ground between the pipe and the reservoir to prevent sand grains in the reservoir from flowing into the well; (4) the gas, water and sand mixture flowing into the shaft passes through a gas-liquid-solid separator to separate solid-phase particles, and the separated sand grains are collected into a sand storage device; and after sand grains are filled, the shaft is lifted out, and the shaft is put down to the bottom of the well again after the ground is cleaned up, and the operation is carried out in sequence.

None of the above prior art discloses the provision of screen slots of different areas in the same screen, nor the specific dimensions of the screen slots.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a become precision wire-wrapped screen pipe mainly comprises coupling, center tube, end links, the outer protective sheath of lateral flow formula, the precision wire-wrapped of becoming and support the longitudinal bar. The coupling and the central tube are connected with a matched well entering tool through screw threads. The support longitudinal ribs are welded on the central tube, and play a supporting role in variable-precision wire winding. And the variable-precision winding wire and the supporting longitudinal rib are welded together point to point. The lateral-flow type outer protective sleeve covers the outside of the variable-precision winding wire and plays a role in protecting the winding wire. The end ring is welded on the central tube and plays a role in fixing the lateral flow type outer protective sleeve, the variable-precision winding wire and the supporting longitudinal rib. When an oil well is produced, under the action of gravity differentiation, coarse sand is settled at the middle-lower section of the sieve tube by sand-carrying oil flow, fine sand is at the upper section of the sieve tube, the upper section of the variable-precision wire-wound sieve tube has smaller sieve gaps and the middle-lower section has larger sieve gaps, so that the sand prevention is met, the seepage area of the sieve tube is increased, and the productivity of the oil well is improved.

The specific technical scheme is as follows:

the variable-precision wire-wound sieve tube comprises a coupling, a central tube, an upper end ring, a lower end ring, a lateral-flow outer protective sleeve, a wire winding and a supporting longitudinal rib, wherein the coupling and the central tube are connected with a matched well entry tool through screw threads, the supporting longitudinal rib is welded on the central tube, the wire winding is welded with the supporting longitudinal rib, the lateral-flow outer protective sleeve covers the outside of the wire winding, and the upper end ring and the lower end ring are welded on the central tube.

Preferably, the welding of the wire winding and the supporting longitudinal ribs adopts spot welding.

Preferably the wire wrap is formed with screen slots.

Preferably the screen slots are arranged in a plurality of rows along the length of the screen.

Preferably the area of the screen slots near the upper end ring is smaller than the area of the screen slots near the lower end ring.

Preferably, the support longitudinal ribs have a plurality of rows arranged along the length direction of the screen pipe.

The utility model discloses a become precision wire-wrapped screen pipe when keeping its sand blocking performance, can maximize screen pipe seepage flow area again, has important meaning to improving the oil well productivity, and application prospect is wide.

Drawings

FIG. 1 is a schematic structural view of the variable-precision wire-wrapped screen pipe of the present invention;

FIG. 2 is an enlarged view of the screen slot portion of the screen tube of FIG. 1.

The reference numbers are as follows:

1-coupling; 2-a central tube; 3-an end ring; 4-an end ring; 5-side-flow type outer coating sheath; 6-winding the filaments; 7-support ribs; 8-Screen gap (from top to bottom, screen gap is bigger)

Detailed Description

The following describes the variable-precision wire-wrapped screen pipe according to the present invention in detail with reference to the accompanying drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The described embodiments are merely exemplary and are intended to illustrate the invention and should not be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "up and down", "front and back", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly.

The first embodiment is as follows:

the production well of a certain oil field needs to be provided with a sieve tube. Because the geological environment is special, the sand content in the oil well is large, and the normal sand content requirement cannot be met by adopting the common sieve tube under the condition of ensuring the oil output. Therefore, it is necessary to use a variable-precision wire-wrapped 6 screen, which means that the screen slot area on the wire-wrapped screen varies. Specifically, the screen gap becomes larger from top to bottom. As shown in the attached figure 1, the variable-precision wire-wrapped screen pipe comprises a coupling 1, a central pipe 2, an upper end ring 3, a lower end ring 4, a lateral flow type outer protective sleeve 5, a wire wrap 6 and a supporting longitudinal rib 7. The coupling 1 is provided with a part of connector, the central tube 2 is also provided with a part of connector, and the two parts of connectors are matched and connected with a matched well entering tool through screw threads. The supporting longitudinal ribs 7 are basically annular, the cross section of each supporting longitudinal rib is circular, and the supporting longitudinal ribs 7 are basically circular and welded on the central tube 2 to support the variable-precision winding wires 6. For guaranteeing the support effect, support and indulge muscle 7 and have 5 rows, arrange along the length direction of screen pipe, wire winding 6 with support indulge muscle 7 through spot welding, prevent too big weld mark to wire winding 6 filtration's destruction, lateral flow formula outer protective sheath 5 adopts resin material, both ends and 2 outer wall fixed connection of center tube, cover wire winding 6 outsides play the guard action to wire winding 6. The upper end ring 3 and the lower end ring 4 are welded on the central tube 2 and play a role in fixing the convection type outer protective sleeve 5 and the variable precision winding wire 6.

Screen slots are formed in the precision winding 6. In this embodiment, the screen slots are arranged in 5 rows along the length of the screen as shown in figure 2. The flow area of the screen slots is gradually increased from the upper end ring 3 to the lower end ring 4, the screen slot closest to the upper end ring 3 is the smallest screen slot area of 8 meshes, the screen slot closest to the lower end ring 4 is the largest screen slot, and the area of the screen slot is 25 meshes. When an oil well is produced, under the action of gravity differentiation, coarse sand is settled at the middle-lower section of the sieve tube by sand-carrying oil flow, fine sand is at the upper section of the sieve tube, the upper section of the variable-precision wire-wound sieve tube has smaller sieve gaps and the middle-lower section has larger sieve gaps, so that the sand prevention is met, the seepage area of the sieve tube is increased, and the productivity of the oil well is improved.

In actual use, firstly, the screen seam size of the variable-precision wire-wound screen pipe is optimally designed according to the sand diameter screening result of the stratum of the perforated well section, the screen seam is machined and formed, then the designed and machined variable-precision wire-wound screen pipe is put into a well along with an oil well pipe column, a releasing packer is connected on the well, the length of the variable-precision wire-wound screen pipe covers the oil layer perforated section, finally, a ground pump truck is used for stepping and pressing, after the packer is set and the seal is tested to be qualified, the pipe column is released in a positive rotation mode, and sand prevention construction of the variable-precision wire-wound.

Example two:

the oil production well in a certain oil field is technically reformed, and an old sieve tube is replaced. The variable-precision wire-wrapping sieve tube with better actual effect is particularly adopted. The device comprises a coupling, a central pipe, an upper end ring, a lower end ring, a lateral flow type outer protective sleeve, a wire winding and a supporting longitudinal rib. The coupling is provided with a connector which is connected with a matched well entering tool through a screw thread. The supporting longitudinal ribs are basically in a circular ring shape and are clamped on the central tube to support the variable-precision wire winding. For guaranteeing the support effect, support and indulge the muscle and have 4 rows, along the length direction equipartition of screen pipe, the wire winding with support indulge the muscle and form point-to-point connection, reduce the interference to the wire winding in order to prevent to wire winding filtration's destruction, the lateral flow formula outer protective sheath adopts resin material, thickness is no longer than 5mm, the both ends and the center tube outer wall of lateral flow formula outer protective sheath are in with hot melt's mode fixed connection, cover the wire winding is outside, play the guard action to the wire winding. The upper end ring and the lower end ring are welded on the central pipe, and play a role in fixing the lateral flow type outer protective sleeve and the variable-precision winding wire.

Screen slots are formed on the variable-precision winding wires. In this embodiment, there are 12 rows of screen slots along the length of the screen. The flow area of the screen slots is gradually increased from the upper end ring to the lower end ring, the minimum screen slot area is 10 meshes, and the maximum screen slot area is 40 meshes. When an oil well is produced, under the action of gravity differentiation, coarse sand is settled at the middle-lower section of the sieve tube by sand-carrying oil flow, fine sand is at the upper section of the sieve tube, the upper section of the variable-precision wire-wound sieve tube has smaller sieve gaps and the middle-lower section has larger sieve gaps, so that the sand prevention is met, the seepage area of the sieve tube is increased, and the productivity of the oil well is improved.

The foregoing is only a part of the preferred embodiments of the present invention. Any person skilled in the art may modify the above-described embodiments or modify them to equivalent solutions. Therefore, any simple modifications or equivalent replacements made according to the embodiments of the present invention belong to the scope of the claimed invention.

Claims (6)

1. The utility model provides a become precision wire-wrapped screen pipe which characterized in that: including coupling (1), center tube (2), upper end ring (3), lower end ring (4), lateral flow outer protective sheath (5), wire winding (6), support and indulge muscle (7), coupling (1) with center tube (2) pass through the screw thread with the instrument of working in the well and are connected, support and indulge muscle (7) welding on center tube (2), wire winding (6) with support and indulge muscle (7) welding, lateral flow outer protective sheath (5) cover wire winding (6) are outside, upper end ring (3) with lower end ring (4) welding on center tube (2).

2. The variable precision wire-wrapped screen of claim 1, wherein: and the wire winding (6) and the supporting longitudinal rib (7) are welded by spot welding.

3. The variable precision wire-wrapped screen of claim 1, wherein: the wire winding (6) is provided with screen slots (8).

4. The variable precision wire-wrapped screen of claim 3, wherein: the screen slots (8) are arranged in a plurality of rows along the length direction of the screen pipe.

5. The variable precision wire-wrapped screen of claim 3, wherein: the area of the screen slot (8) is gradually increased from the upper end ring (3) to the lower end ring (4).

6. The variable precision wire-wrapped screen of claim 1, wherein: the supporting longitudinal ribs (7) are arranged in a plurality of rows along the length direction of the sieve tube.

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