CN2929179Y

CN2929179Y - Combined anti-sand sieve tube

Info

Publication number: CN2929179Y
Application number: CN 200620120703
Authority: CN
Inventors: 王树龙; 杨霞
Original assignee: Dagang Oilfield Group Co Ltd
Current assignee: Dagang Oilfield Group Co Ltd
Priority date: 2006-06-23
Filing date: 2006-06-23
Publication date: 2007-08-01
Anticipated expiration: 2016-06-23

Abstract

The invention relates to a combined type sand-proof sieve tube which is a composite metal solid filtering net comprises an all-welded screen mesh and a sieve tube with kerfs, which has the function of preventing the stratum sand gets into the sieve tube of the borehole. Utilizing the characters of high overcurrent capacity and high pressure resistance of the wrapped sieve and the stable structure of the sieve with kerfs, the invention comprises a center tube, a wrapped sieve net and a tube with kerfs three layers from the inside to the outside consecutively, wherein, screws are provided on both ends of the center tube, the wrapped sieve net and the tube with kerfs are fixed on the center tube via supporting ring, a plurality of through holes went through stratum liquid are provided equidistributedly on the portion where the center tube , the wrapped sieve net and the tube with kerfs are superpositioned, the wrapped sieve net covers the through-hole portion of the center tube, the wrap section is a wide-outside and narrow-inside trapezia section, the filtering section of the sieve net is a narrow-outside and wide-inside 'V' shaped section, which forms a 15 degree to 30 degree waterpower angle of widening, and the supporting ring is arranged on both ends of the oil penetrating through-hole portion of the center tube. The sand-proof function of the combined type sieve tube is mainly realized by wrapped sieve net and tube with kerfs, and the utility model is applicable to the well completion construction in horizontal wells.

Description

The combined type sand control screen

Technical field

The present invention relates to a kind of combined type sand control screen, it is a kind of composition metal solid filtering net of forming by all welded type screen cloth and cutting seam sieve tube, main as when the oil and gas development completion practice, prevent that reservoir sand from entering the combination metal filtration sand control screen of pit shaft, belongs to the special-purpose wellbore tool that oil development is used.

Background technology

In the oil and gas development process, reservoir sand can flow and enters pit shaft along with oil gas, causes complex situations such as pit shaft holddown, sand bury, and influences oil gas well ordinary production.Sand control screen is used for exactly preventing that reservoir sand from entering pit shaft, the mechanical type filter utility of control formation sand production.At present, the screen casing of mechanical sand control use mainly contains: conventional cutting seam sieve tube, wire-wrapped screen, the anti-sandpipe of metal wool, metal screen sand control screen etc. are several.The major defect of conventional cutting seam sieve tube is that seepage area is little; the major defect of the anti-sandpipe of metal wool is that filter opening instability, shock resistance are poor; the major defect of wire-wrapped screen is because skin does not have topping; in the process of removing, cause " sleave " easily and increase engineering risk; the major defect of metal screen sand control screen is that metal filter screen bears the pressure reduction ability than hanging down and the low existence that reaches owing to topping of external protection protection intensity; cause the bare area of metal filter screen to reduce; filter opening instability consequently, the yielding increase engineering risk of topping.

Summary of the invention

Purpose make full use of the wire-wrapped screen conveyance capacity strong, bear the high characteristics of pressure reduction, utilize the firm characteristics of slot sieve structure, with limited sand control theory is the wide design of seam that cutting seam sieve tube is carried out on the basis, a kind of combined type sand control screen of new structure is provided, under the prerequisite that improves whole combination screen casing shock resistance, also increases the process area of wire-wrapped screen.

Combined type sand control screen of the present utility model adopts following technical scheme, be that a kind of combined type sand control screen is made of for three layers central tube, wrapping wire screen cloth and slot pipe from inside to outside successively, it is characterized in that there is screw thread at the central tube two ends, wrapping wire screen cloth and slot pipe are fixed on the central tube by support ring.

Central tube generally adopts standard oil pipe or sleeve pipe, also can adopt stainless steel tube to satisfy specific (special) requirements.Central tube and wrapping wire screen cloth and slot pipe evenly have the some through holes that are used for by formation fluid for superimposed section, and through hole can also can be slotted hole for circular hole.The screw thread at central tube two ends can connect box cupling.

The wrapping wire screen cloth covers the through hole of central tube.The wrapping wire screen cloth is all welded type overall structure that has longitudinal bracing, and its wire will carry out preliminary treatment before weldering, and its section bevel angle guarantees dimensional requirement.Its wrapping wire section is trapezoidal cross-section wide outside and narrow inside.The screen filtration section that forms is " V " shape section of outer narrow inner width, and forms 15 °-30 ° waterpower angle of flare.According to the formation sand production situation, the slit between the screen cloth wrapping wire generally is controlled at 0.2-1.5mm, screen cloth thickness 4-8mm.

To layout, the slit between the wrapping wire screen cloth wrapping wire that the slot width cooperates with it usually is complementary the slot of slot pipe along the slot tubular axis, and the slot width generally is controlled at 0.5-4mm, and the wall thickness of slot pipe is controlled at 4-12mm.

In the combined type sand control screen, with bad the fixing of more than one support screen cloth and slot pipe are fixed on the central tube usually.Usually support ring is installed in the two ends of central tube oil impregnate via regions.

The sand control function of combined type sand control screen is finished jointly by wrapping wire screen cloth and slot pipe.

Description of drawings

Fig. 1 combined type sand control screen structural representation

Fig. 2 combined type sand control screen structure A-A generalized section

The twine sectional schematic diagram of Fig. 3 wrapping wire screen cloth

Among the figure, central tube 1, wrapping wire screen cloth 2, slot pipe 3, screw thread 4, support ring 5, through hole 6, box cupling 7, slot 8.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further specified, as depicted in figs. 1 and 2, combined type sand control screen of the present utility model is made of for 3 three layers central tube 1, wrapping wire screen cloth 2 and slot pipe from inside to outside successively, it is characterized in that there is screw thread 4 at central tube 1 two ends, wrapping wire screen cloth 2 and slot pipe 3 are fixed on the central tube 1 by support ring 5.

Central tube 1 general employing standard oil pipe or sleeve pipe also can adopt stainless steel tube to satisfy specific (special) requirements.3 superimposed sections of central tube 1 and wrapping wire screen cloth 2 and slot pipes evenly have several and are used for through hole 6 by formation fluid, and through hole 6 can also can be slotted hole for circular hole.The screw thread at central tube two ends can connect box cupling 7.

Wrapping wire screen cloth 2 covers the through hole 6 of central tube 1 fully.Wrapping wire screen cloth 2 is for having all welded type overall structure of longitudinal bracing, and its wire will carry out preliminary treatment before weldering, and its section bevel angle guarantees dimensional requirement.As shown in Figure 3, its wrapping wire section is trapezoidal cross-section wide outside and narrow inside, and the screen filtration section of formation is " V " shape section of outer narrow inner width, and forms 15 °-30 ° waterpower angle of flare.According to the formation sand production situation, the slit spacing between the screen cloth wrapping wire generally is controlled at 0.2-1.5mm, and screen cloth thickness is at 4-8mm.

To layout, the slit between the wrapping wire screen cloth wrapping wire that slot 8 width cooperate with it usually is complementary the slot 8 of slot pipe 3 along the slot tubular axis, and the slot width generally is controlled at 0.5-4mm, and the wall thickness of slot pipe is controlled at 4-12mm.

In the combined type sand control screen, screen cloth and slot pipe are fixed on the central tube with support ring.Usually support ring 5 is installed in the two ends of central tube oil impregnate via regions.

The sand control function of combinations thereof formula sand control screen is mainly realized by wrapping wire screen cloth and slot pipe, can use in the horizontal well completion construction.

Claims

1, a kind of combined type sand control screen is from inside to outside successively by central tube (1), wrapping wire screen cloth (2) and (3) three layers of formation of slot pipe, it is characterized in that there is screw thread (4) at central tube (1) two ends, wrapping wire screen cloth (2) and slot pipe (3) are fixed on the central tube (1) by support ring (5).

2, combined type sand control screen as claimed in claim 1 is characterized in that central tube (1) and wrapping wire screen cloth (2) and slot pipe (3) evenly have through hole (6) for superimposed section.

3, combined type sand control screen as claimed in claim 1 is characterized in that wrapping wire screen cloth (2) covers the through hole (6) of central tube (1).

4, combined type sand control screen as claimed in claim 1 is characterized in that the wrapping wire section of wrapping wire screen cloth (2) is trapezoidal cross-section wide outside and narrow inside, and the screen filtration section of formation is V-shaped, and the waterpower angle of flare is 15 °-30 °.

5, combined type sand control screen as claimed in claim 1 is characterized in that the slit spacing between the wrapping wire of wrapping wire screen cloth (2) is 0.2-1.5mm, and wrapping wire screen cloth thickness is 4-8mm.

6, combined type sand control screen as claimed in claim 1, to layout, slot (8) width is 0.5-4mm to the slot (8) that it is characterized in that slot pipe (3) along the slot tubular axis, the wall thickness of slot pipe is 4-12mm.

7, combined type sand control screen as claimed in claim 1 is characterized in that support ring (5) is installed in the two ends that central tube (1) has some via regions.