Abstract
A sand control screen pipe includes couplings, movable spacer bushes, an outer movable radial slotted screen pipe, a split supporting ring and an inner axial slotted screen pipe. In downhole sand control construction work, a movable combined sand control pipe of axial and radial slotted screen pipes is required to be aligned with an oil layer position, this sand control screen pipe adopts the outer radial slotted screen pipe and the inner axial slotted screen pipe for blocking sand, and the outer radial slotted screen pipe can carry out limited axial movement along the inner axial slotted screen pipe and free rotational motion around the axial line of the inner axial slotted screen pipe, so that the controlled sand can be effectively prevented from hardening and an oil leakage channel is kept smooth for a long time to improve the production efficiency of an oil well.
Claims
1. A movable combined sand control pipe of axial and radial slotted screen pipes, wherein the sand control screen pipe is composed of couplings, movable spacer bushes, an outer movable radial slotted screen pipe, a split supporting ring and an inner axial slotted screen pipe; wherein the two couplings are respectively connected with both ends of the inner axial slotted screen pipe; the two movable spacer bushes are respectively installed at both ends of the inner axial slotted screen pipe, and the movable spacer bushes can axially move between the shaft shoulder of the inner axial slotted screen pipe and the couplings and can freely rotate around the axial line of the inner axial slotted screen pipe; the outer movable radial slotted screen pipe is installed on the movable spacer bushes and the split supporting ring, and the outer movable radial slotted screen pipe can axially move between the two couplings and can freely rotate around the axial line of the inner axial slotted screen pipe; the split supporting ring is installed in a ring slot of the inner axial slotted screen pipe; and the inner axial slotted screen pipe is respectively connected with the couplings, the movable spacer bushes and the split supporting ring.
2. The movable combined sand control pipe of axial and radial slotted screen pipes of claim 1, wherein the slot of the outer movable radial slotted screen pipe is a slot in the circumferential direction, and the shape of the slot width structure of the section along the axial direction is two trapezoidal slots, which are connected in sequence from outside to inside and have narrow outer parts and wide inner parts.
3. The movable combined sand control pipe of axial and radial slotted screen pipes of claim 1, wherein the split supporting ring is composed of a semicircular ring with tenons on both ends and a semicircular ring with mortises on both ends, and during installation, the tenons and the mortises of the two semicircular rings are in butt joint and are fastened in the ring slot of the inner axial slotted screen pipe.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a schematic diagram of a contour structure of a movable combined sand control pipe of axial and radial slotted screen pipes.
[0012] FIG. 2 is a sectional view of an A-A position in the schematic diagram of the contour structure of the movable combined sand control pipe of axial and radial slotted screen pipes in FIG. 1.
[0013] FIG. 3 is a schematic diagram of a structure of a split supporting ring.
[0014] FIG. 4 is a sectional view of an A-A position in the schematic diagram of the structure of the split supporting ring in FIG. 3.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] See FIG. 1, the movable combined sand control pipe of axial and radial slotted screen pipes of the present invention is mainly composed of 5 parts. Two couplings 1, which are respectively connected with both ends of an inner axial slotted screen pipe, are used for limiting the axial movement ranges of movable spacer bushes and an outer movable radial slotted screen pipe on one hand and are used for installing and connecting in sand control work on the other hand; two movable spacer bushes 2, which are respectively installed at both ends of the inner axial slotted screen pipe, can axially move between the shaft shoulder of the inner axial slotted screen pipe and the couplings and can freely rotate around the axial line of the inner axial slotted screen pipe, and are used for supporting the outer movable radial slotted screen pipe, the outer movable radial. slotted screen pipe 3, wherein the slot thereof is a slot in the circumferential direction, the shape of the slot width structure of the section along the axial direction is two trapezoidal slots, which are connected in sequence from outside to inside and have narrow outer parts and wide inner parts, the outer movable radial slotted screen pipe is used for blocking sand and providing an inflow channel of crude oil, the outer movable radial slotted screen pipe is installed on the movable spacer bushes and a split supporting ring, and can axially move between the two couplings and can freely rotate around the axial line of the inner axial slotted screen pipe, so that the controlled sand can be effectively prevented from hardening and an oil leakage channel is kept smooth for a long time to improve the production efficiency of an oil well; the split supporting ring 4, which is installed in a ring slot of the inner axial slotted screen pipe, and the split supporting ring is composed of two semicircular rings, is fastened in the ring slot of the inner axial slotted screen pipe by a tenon and mortise structure and is used for supporting the outer movable radial slotted screen pipe; and the inner axial slotted screen pipe 5, which is respectively connected with the couplings, the movable spacer bushes and the split supporting ring and is used for blocking sand, providing the inflow channel of crude oil and supporting the outer movable radial slotted screen pipe.
[0016] See FIG. 2, in the movable combined sand control pipe of axial and radial slotted screen pipes of the present invention, the outer movable radial slotted screen pipe is on the outermost layer, the inner axial slotted screen pipe is on the innermost layer, and the outer movable radial slotted screen pipe and, the inner axial slotted screen pipe are overlapped to form a gap for sand control, and when downhole crude oil flows by an outer radial slot and an inner axial slot, the flow direction produces vertical cross change, which is conducive to relieve accumulation and hardening of controlled sand and improve the production efficiency of the oil well.
[0017] See FIG. 3 and FIG. 4, in the movable combined sand control pipe of axial and radial slotted screen pipes of the present invention, the split supporting ring is composed of a semicircular ring with tenons on both ends and a semicircular ring with mortises on both ends, and during installation, the tenons and the mortises of the two semicircular rings are in butt joint and are fastened in the ring slot of the inner axial slotted screen pipe.
