CN-117248865-B - Impact self-cleaning sand prevention device

CN117248865BCN 117248865 BCN117248865 BCN 117248865BCN-117248865-B

Abstract

The invention discloses an impact self-cleaning sand control device which comprises a coupling, a sand filtering pipe, a reducing piston assembly, a central pipe and an impact vibrator, wherein the top end of the coupling is connected with a pumping pipe column, the bottom end of the coupling is connected with the top end of the sand filtering pipe, the bottom end of the sand filtering pipe is connected with the top end of the central pipe, the bottom end of the central pipe is connected with the top end of the impact vibrator, and the reducing piston assembly is connected with the outer wall of the central pipe. The invention can realize continuous and real-time removal of the plugs of the sand filtering pipe by the extension and retraction of the oil pumping pipe column in the up and down stroke process of the oil pump, and maintain the permeability of the sand filtering pipe.

Inventors

WANG SHUHUI
FEI DAN
ZHANG SHUAI
XIE JIAXI
WANG GUANGSHUN
GUAN JIUZHOU
LANG BAOSHAN
GUO BINJIAN
LIU JIANGLING
ZHU CHENGCHAO
KUANG XUGUANG
XI XIN
NIU YURU

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220610

Claims (5)

1. The impact self-cleaning sand prevention device is characterized by comprising a coupling (1), a sand filtering pipe (2), a reducing piston assembly (3), a central pipe (4) and an impact vibrator (5), wherein the top end of the coupling (1) is connected with a pumping pipe column, the bottom end of the coupling is connected with the top end of the sand filtering pipe (2), the bottom end of the sand filtering pipe (2) is connected with the top end of the central pipe (4), the bottom end of the central pipe (4) is connected with the top end of the impact vibrator (5), and the reducing piston assembly (3) is connected to the outer wall of the central pipe (4); The variable-diameter piston assembly (3) comprises an upper fixing sleeve (3-1), a variable-diameter piston valve seat (3-2), a variable-diameter piston body (3-4), a bridging limiting sleeve (3-5), a variable-diameter piston valve ball (3-6) and a lower fixing sleeve (3-8), wherein the variable-diameter piston body (3-4) is fixedly connected to the outer wall of a central tube (4) through a fixing nail (4-1), the upper fixing sleeve (3-1), the bridging limiting sleeve (3-5) and the lower fixing sleeve (3-8) are respectively connected to the outer wall of the variable-diameter piston body (3-4), the variable-diameter piston valve seat (3-2) is arranged on the outer side of the variable-diameter piston body (3-4) and is fixed by the upper fixing sleeve (3-1) and the bridging limiting sleeve (3-5), and the variable-diameter piston valve ball (3-6) is arranged on the outer side of the variable-diameter piston body (3-4) and is positioned below the variable-diameter piston valve seat (3-2) and is fixed by the lower fixing sleeve (3-8) and the bridging limiting sleeve (3-5); The variable-diameter piston body (3-4) is provided with three large-diameter sections which are arranged at intervals, and a small-diameter section is arranged between every two adjacent large-diameter sections, wherein the three large-diameter sections are respectively connected with the upper fixed sleeve (3-1), the bridging limiting sleeve (3-5) and the lower fixed sleeve (3-8) from top to bottom; the impact vibrator (5) comprises a vibrator pump barrel (5-1), a vibrator piston (5-2), a vibrator connecting rod (5-4), a vibrator limiting sleeve (5-5) and a counterweight joint (5-7), wherein the upper end of the vibrator pump barrel (5-1) is connected with the bottom end of the central tube (4), the lower end of the vibrator pump barrel (5-1) is connected with the vibrator limiting sleeve (5-5), the vibrator piston (5-2) is connected inside the vibrator pump barrel (5-1) in a sliding mode, a boss is arranged on the inner wall of the vibrator pump barrel (5-1) and used for limiting the maximum upward position of the vibrator piston (5-2), the lower end of the vibrator piston (5-2) is connected with the vibrator connecting rod (5-4), and the lower end of the vibrator connecting rod (5-4) is connected with the counterweight joint (5-7).
2. The impact self-cleaning sand control device according to claim 1, wherein the reducing piston valve seat (3-2) is formed by welding two parts of a reducing piston (3-9) and a valve seat (3-10), a groove is formed in the inner side of the reducing piston (3-9), and a reset spring a (3-3) is arranged in the groove.
3. The impact self-cleaning sand control device according to claim 1, wherein a groove is formed in the inner side of the variable-diameter piston valve ball (3-6), and a return spring b (3-7) is arranged in the groove.
4. The impact self-cleaning sand control device according to claim 1, wherein a plurality of sand control grooves (5-3) are formed in the outer surface of the vibrator piston (5-2).
5. The impact self-cleaning sand control device according to claim 1, wherein the vibrator limit sleeve (5-5) has a stepped inner diameter, and a plurality of through holes (5-6) are formed at the steps.

Description

Impact self-cleaning sand prevention device Technical Field The invention belongs to the field of oil extraction engineering, relates to a sand filtering device for removing blocking of a sand filtering pipe through feedback liquid flow, and in particular relates to an impact self-cleaning sand prevention device. Background The conventional sand control methods for oil wells at present comprise mechanical sand control and chemical sand control methods. The mechanical sand prevention method mainly comprises sand prevention of a sand filtering pipe with various forms under a pump and gravel packing sand prevention method outside the sand filtering pipe. Whether it is mechanical sand prevention, the permeability of the sand prevention structure is reduced, and the production of an oil well is influenced. At present, no feasible technical scheme is available for the problem of blocking the sand filtering pipe under the pump, and technicians are used to selecting and improving the structure of the sand filtering pipe, so that the sand filtering effect is improved, the possibility of damaging the permeability of the sand filtering pipe is reduced, but the problem is not fundamentally solved. Disclosure of Invention In order to solve the problem of blocking of the sand filtering pipe under the pump, the invention provides the impact self-cleaning sand prevention device, which can continuously and real-timely remove the blocking object of the sand filtering pipe and keep the permeability of the sand filtering pipe through the extension and retraction of the oil pumping pipe column in the up and down stroke process of the oil pump. The invention adopts the technical scheme that the impact self-cleaning sand prevention device comprises a coupling, a sand filtering pipe, a reducing piston assembly, a central pipe and an impact vibrator, wherein the top end of the coupling is connected with a pumping pipe column, the bottom end of the coupling is connected with the top end of the sand filtering pipe, the bottom end of the sand filtering pipe is connected with the top end of the central pipe, the bottom end of the central pipe is connected with the top end of the impact vibrator, and the reducing piston assembly is connected with the outer wall of the central pipe. The variable-diameter piston assembly comprises an upper fixing sleeve, a variable-diameter piston valve seat, a variable-diameter piston body, a bridging limiting sleeve, a variable-diameter piston valve ball and a lower fixing sleeve, wherein the variable-diameter piston body is fixedly connected to the outer wall of a central tube through a fixing nail, the upper fixing sleeve, the bridging limiting sleeve and the lower fixing sleeve are respectively connected to the outer wall of the variable-diameter piston body, the variable-diameter piston valve seat is arranged on the outer side of the variable-diameter piston body and is fixed by the upper fixing sleeve and the bridging limiting sleeve, and the variable-diameter piston valve ball is arranged on the outer side of the variable-diameter piston body, is positioned below the variable-diameter piston valve seat and is fixed by the lower fixing sleeve and the bridging limiting sleeve. The variable-diameter piston body is provided with three large-diameter sections which are arranged at intervals, small-diameter sections are arranged between every two adjacent large-diameter sections, the three large-diameter sections are respectively connected with an upper fixed sleeve, a bridging limiting sleeve and a lower fixed sleeve from top to bottom, milling grooves are uniformly distributed on the three large-diameter sections, the bottoms of the milling grooves are as high as the small-diameter sections, and a variable-diameter piston valve ball can relatively slide in the milling grooves. As a further embodiment of the invention, the reducing piston valve seat is formed by welding two parts of a reducing piston and a valve seat, a groove is formed in the inner side of the reducing piston, and a return spring a is arranged in the groove. As a further embodiment of the invention, the inner side of the variable diameter piston valve ball is provided with a groove, and a return spring b is arranged in the groove. The impact vibrator comprises a vibrator pump cylinder, a vibrator piston, a vibrator connecting rod, a vibrator limiting sleeve and a counterweight joint, wherein the upper end of the vibrator pump cylinder is connected with the bottom end of a central pipe, the lower end of the vibrator pump cylinder is connected with the vibrator limiting sleeve, the vibrator piston is connected inside the vibrator pump cylinder in a sliding mode, a boss is arranged on the inner wall of the vibrator pump cylinder and used for limiting the maximum upward position of the vibrator piston, the lower end of the vibrator piston is connected with the vibrator connecting rod, and the lower end of the vibrator connecting rod is co