Unlock instant, AI-driven research and patent intelligence for your innovation.

Horizontal well continuous sand flushing device

A horizontal well and sand washing technology, which is applied in the direction of flushing boreholes, boreholes/well components, earthwork drilling and production, etc., can solve the problems of cuttings sinking, secondary deposition stuck pipe strings, etc., to improve sand washing efficiency, Reliable performance, the effect of string anti-jamming

Inactive Publication Date: 2008-03-19
DAQING OILFIELD CO LTD
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a continuous sand washing device for horizontal wells in order to solve the problem of debris sinking and secondary deposition stuck in the pipe string when the sand washing pipe string of a conventional vertical well is used for sand washing.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Horizontal well continuous sand flushing device

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific embodiment one: see Fig. 1, this embodiment is made up of wellhead part and downhole part, and downhole part is made up of swirling flow sand washing device 1, safety valve 2, oil-casing converter 3 and tubing 4, and wellhead part is made up of self-sealing seal The well tool 5, the work cylinder 6, the first backwash valve 7, the upper oil pipe 8, the second backwash valve 9 and the third backwash valve 10, the oil upper pipe 8 is arranged in the work cylinder 6, and the upper end of the work cylinder 6 is set There is a self-sealing well sealing device 5, the lower end of the upper oil pipe 8 is connected to the upper end of the oil jacket converter 3, the first backwash valve 7 is set on the upper oil pipe 8 at the lower end of the work cylinder 6, and the second backwash valve 9 is set on the work cylinder 6, the third backwash valve 10 is arranged on the upper oil pipe 8 at the upper end of the self-sealing well sealing device 5, the lower end of the oil-ca...

specific Embodiment approach 2

[0008] Specific embodiment two: see Fig. 1, the self-sealing sealing device 5 of this embodiment is made up of retaining ring 51, sealing ring 52 and sleeve 53, and sealing ring 52 is installed in sleeve 53, and sleeve 53 is arranged on retaining ring 51 Above, the side wall of the retaining ring 51 is provided with a liquid inlet hole 54, and the side wall of the sleeve 53 is provided with a liquid outlet hole 55. This structure has good sealing performance and does not puncture or leak.

[0009] The working principle of the above-mentioned continuous sand washing device for horizontal wells is as follows: see Figure 1. During the lowering process of the pipe string, the backwash valve 7 in the working cylinder 6 goes down with the pipe string. When it moves out of the working cylinder 6, the upper backwash valve 7 enters the working barrel 6 at the same time, providing a channel for the flushing fluid from the oil pipe to the working barrel 6, realizing the non-stop pumping t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a horizontal well continuous sand flushing device, and relates to a sand flushing device. The invention aims at solving the problems that the cuttings are easily sunk, and a stuck string is deposited for twice, when a sand flushing string of a conventional vertical well flushes sands. A self-sealing blowout preventer (5) is arranged at the upper end of the working barrel (6) of the invention, the lower end of an oil tube (8) is connected with the upper end of an oil jacket converter (3), a first back flushing valve (7) is arranged on the upper oil tube (8) at the lower end of the working barrel (6), a second back flushing valve (9) is arranged on the upper oil tube (8) at the lower part of the working barrel (6), a third back flushing valve (10) is arranged on the upper oil tube (8) at the upper end of the self-sealing blowout preventer (5), the lower end of the oil jacket converter (3) is connected with the upper end of a lower oil tube (4), the lower end of the lower oil tube (4) is connected with the upper end of a safety valve (2), and the lower end of the safety valve (2) is connected with a rotational flow flushing device(1). The invention can realize that the pump is not stopped to flush sands continuously, the performance of each part is reliable, the seal performance is good, the invention has non-piercement and no leakage, and achieves the effects that the sand flushing efficiency is improved, as well as the present invention prevents the string from stuck.

Description

technical field [0001] The invention relates to a sand washing device. Background technique [0002] In horizontal well workover operations, in order to meet the needs of solving sand sticking and flushing fish heads, sand washing operations are required, but cuttings in horizontal wells are not easy to return, and secondary deposition is easy to get stuck in the pipe string after the pump is stopped. The currently used conventional vertical well sand washing pipe string is used for sand washing. When a single pipe is washed out, the pump must be stopped to connect the single pipe. At this time, cuttings will sink and secondary deposition will be stuck in the pipe string. Therefore, the sand washing strings of conventional vertical wells are no longer suitable for the sand washing needs of horizontal wells. Contents of the invention [0003] The object of the present invention is to provide a continuous sand washing device for horizontal wells in order to solve the proble...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B21/00
Inventor 刘合卢东风姬生柱侯维前朱秀峰艾教银
Owner DAQING OILFIELD CO LTD