CN214997594U - Composite sand-proof screen pipe - Google Patents

Abstract

The utility model relates to a compound sand control screen pipe. The composite sand control screen comprises: the base tube, the composite sand control assembly and the protective sleeve are arranged from inside to outside in sequence; the tube wall of the base tube is provided with a plurality of through holes; the composite sand control assembly comprises a gravel packing layer and a filter core layer; the pipe wall of the protective sleeve is provided with a plurality of filtering holes; the filter core layer comprises a plurality of layers of anti-corrosion metal filter screens; the meshes of the anti-corrosion metal filtering screen are gradually reduced from outside to inside. The utility model discloses a set up outside the gravel packing layer and filter the sandwich layer for compound sand control screen pipe is after going into out the sand bed under, filters the sandwich layer and has further strengthened hindering the sand effect, also can effectively reduce the direct impact to the gravel packing layer of stratum grit, realizes filtering the high efficiency of stratum grit, reaches the effect of sand control, can prolong the life of screen pipe simultaneously, and the utility model discloses a compound sand control screen pipe preparation simple process, the cost is lower.

Description

Composite sand-proof screen pipe

Technical Field

The utility model relates to a sand control technical field in the pit in the oil gas field development in-process, more specifically relates to a compound sand control screen pipe.

Background

In the production process of an oil field, particularly when a loose sandstone oil and gas reservoir is exploited, because the sand production phenomenon is common in the exploitation process, the exploitation needs to be carried out by adopting a sand prevention process. The application of sand control technique can directly influence the quality and the exploitation effect of oil and gas well, still relate to the production life of oil and gas well simultaneously, consequently, sand control technique is vital in the exploitation in-process of oil and gas well, and the continuous development of promotion sand control technique needs constantly to innovate sand control instrument and supporting technology, wherein, the sand control instrument that is most often used in the oil and gas well exploitation in-process is sand control screen pipe, can block the sand grain in the thing is produced to the stratum outside sand control screen pipe through sand control screen pipe, can play fine sand control purpose, thereby prevent that oil well sand production from causing the production stagnation situation. At present, oil and gas well sand control methods are numerous, and can be roughly divided into chemical sand control, sand arch sand control, mechanical sand control, thermal coking sand control, composite sand control and other sand control methods according to the sand control principle. The commonly used sand control screen pipes mainly include slotted liner pipes, metal cotton screen pipes, wire-wrapped screen pipes and metal mesh screen pipes. In mechanical sand control processes, sand screens are commonly used as a tool for sand control. The most widely used current sand control screen pipe is to directly adopt a metal mesh screen pipe and a metal cotton screen pipe as filtering materials, but when the two materials are used in reservoirs with high contents of fine sand, silt, thick oil and clay, the two materials still have the problem of blockage, the fine silt easily passes through the screen pipe filtering materials, the filtering materials are blocked and eroded, and the drilling and production cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the above-mentioned technical defect that prior art exists at present, provide a compound sand control screen pipe.

In order to achieve the purpose, the utility model is realized by the following technical proposals: a composite sand control screen, comprising: the base tube, the composite sand control assembly and the protective sleeve are arranged from inside to outside in sequence; the pipe wall of the base pipe is provided with a plurality of through holes; the composite sand control assembly comprises a gravel packing layer and a filter core layer; and the pipe wall of the protective sleeve is provided with a plurality of filtering holes.

In a preferred embodiment of the present invention, the upper and lower ends of the base pipe are provided with oil-equalizing threads.

In a preferred embodiment of the present invention, the composite sand control screen further comprises a coupling, wherein the coupling is connected with one end of the base pipe in a threaded manner.

In a preferred embodiment of the present invention, the gravel packed in the gravel packing layer is circular, and the diameters of the gravel are the same or different.

In a preferred embodiment of the present invention, the filter core layer includes a multi-layer anti-corrosion metal filter screen.

In a preferred embodiment of the present invention, the filter core layer comprises 2 to 3 layers of the anti-corrosion metal filter screen.

In a preferred embodiment of the present invention, the holes of the anti-corrosion metal filter screen are gradually reduced from outside to inside.

Compared with the prior art, the utility model discloses a compound sand control screen pipe's advantage and beneficial effect include at least:

(1) the utility model discloses a compound sand control screen pipe is through setting up the filter core layer outside the gravel packing layer for compound sand control screen pipe is after going into out the sand bed under, and the filter core layer has further strengthened and has hindered the sand effect, also can effectively reduce the direct impact to the gravel packing layer of stratum grit, realizes filtering the high efficiency of stratum grit, reaches the effect of sand control, can prolong the life of screen pipe simultaneously.

(2) When the composite sand control assembly is used in a reservoir with high content of fine sand, silt, thick oil and clay, the fine silt can be effectively prevented from passing through the screen pipe composite sand control assembly, and the sand accumulation of a shaft is avoided.

Drawings

FIG. 1 is a schematic structural view of the composite sand control screen pipe of the present invention;

FIG. 2 is a schematic cross-sectional structure of the composite sand control screen pipe of the present invention;

FIG. 3 is a schematic view of the anti-corrosion metal filtering screen of the composite sand control screen pipe of the present invention;

FIG. 4 is an enlarged partial view of portion A of FIG. 1;

in the figure: 1-base pipe, 2-gravel filling layer, 3-filtering core layer, 4-protective sleeve, 5-coupling, 6-filtering hole, 7-gravel and 8-through hole.

Detailed Description

Example 1

The technical solution of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic structural view of the composite sand control screen according to the present invention.

The composite sand control screen comprises: the base tube 1, the composite sand control assembly and the protective sleeve 4 are arranged from inside to outside in sequence; the tube wall of the base tube 1 is provided with a plurality of through holes 8; the composite sand control assembly comprises a gravel packing layer 2 and a filter core layer 3; the pipe wall of the protective sleeve 4 is provided with a plurality of filtering holes 6. Wherein, the through hole 8 is used for allowing filtered formation fluid to pass through into a well bore; the protective sleeve 4 is used for protecting the sand control assembly from being directly impacted by the large-particle-size sand and preventing the large-particle-size sand from passing through; the filter holes 6 in the protective casing 4 are used for the passage of formation fluids.

Wherein, the upper and lower both ends of base tube 1 all are equipped with oil casing screw thread, and its one end is used for connecting coupling 5, and the other end is used for with casing threaded connection.

In addition, the composite sand control screen pipe also comprises a coupling 5, one end of the coupling 5 is in threaded connection with one end of the base pipe 1, and the other end of the coupling 5 is in threaded connection with the casing pipe.

Fig. 2 is a schematic cross-sectional structure of the composite sand control screen pipe of the present invention, wherein the base pipe 1, the gravel packing layer 2, the filter core layer 3 and the protective layer 4 are concentrically arranged.

In addition, the gravel 7 filled in the gravel filling layer 2 is circular, the diameter of the gravel 7 is the same or different, and the gravel is specifically selected according to different formation sand production conditions, so that uniform sand control is facilitated.

In addition, filter sandwich layer 3 includes 2 ~ 3 layers anticorrosive metal filter screen cloth further strengthens the sand control ability, avoids the grit to directly strike the gravel packing layer simultaneously.

Fig. 3 is the utility model discloses a compound sand control screen's anticorrosive metal filters screen cloth sketch map, anticorrosive metal filters screen cloth's punishment outside-in diminishes gradually, can form the sand bridge of filtering the grit step by step, effectively reduces the grit through rate.

FIG. 4 is a partially enlarged schematic view of part A in FIG. 1, the formation fluid carrying sand first contacts the protective sheath 4, the protective sheath 4 can prevent the sand control assembly from being directly impacted, and the filtering holes 6 on the protective sheath 4 can effectively prevent large-particle-size sand from passing through; the stratum fluid passing through the protective sleeve 4 carries fine sand and stone to flow to the filter element layer 3, and part of the fine sand and stone is filtered, so that the first-step sand prevention effect is achieved; the formation fluid filtered by the filter core layer 3 flows to the gravel packing layer 2 and is further filtered; finally, the oil enters the base pipe through a through hole 8 on the base pipe 1, flows to a shaft and is finally mined out of the ground.

The utility model relates to a compound sand control screen pipe mainly when fine sand, silt, viscous crude, the high reservoir stratum of clay content use, can effectively prevent fine silt to get into the pit shaft through the screen pipe, avoids the long-pending sand of pit shaft.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of description of the present invention, 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.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected or detachably connected, or integrally connected and mechanically connected or electrically connected, directly connected or indirectly connected through an intermediate medium, or connected to each other inside two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (7)

1. A composite sand control screen, comprising: the base pipe (1), the composite sand control assembly and the protective sleeve (4) are arranged from inside to outside in sequence; the pipe wall of the base pipe (1) is provided with a plurality of through holes (8); the composite sand control assembly comprises a gravel packing layer (2) and a filter core layer (3); the pipe wall of the protective sleeve (4) is provided with a plurality of filtering holes (6).

2. The composite sand control screen according to claim 1, wherein the base pipe (1) is provided with oil casing threads at both its upper and lower ends.

3. The composite sand screen as recited in claim 2 further comprising a collar (5), the collar (5) being threadedly connected to one end of the base pipe (1).

4. A composite sand screen according to claim 3, characterized in that the gravel (7) packed in the gravel pack (2) is circular and that the diameter of the gravel (7) is the same or different.

5. The composite sand control screen according to claim 4, wherein the filter core layer (3) comprises a multi-layer corrosion resistant metal filter screen.

6. The composite sand control screen according to claim 5, wherein the filter core layer (3) comprises 2-3 layers of the corrosion resistant metal filter screen.

7. The composite sand control screen of claim 6, wherein the perforations of the corrosion resistant metal filter screen are tapered from the outside inward.

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