Horizontal well external staged fracturing sand control string and method

Abstract

Disclosed is a horizontal well external staged fracturing sand control string and method. A filling service string is tripped in an external staged fracturing and filling sand-control drain string. The external fracturing and filling sand-control drain string comprises a cementing external packer and a filling tool assembly connected in succession. The filling service string comprises a liquid-packing seal, a filling pipe, a filling converter, a flexible pressure tester, a rotary positioning tool, sliding sleeve opening and closing tools, and a packing sealing assembly; the filling pipe, the filling converter, the flexible pressure tester, the rotary positioning tool, the sliding sleeve opening and closing tools and the packing sealing assembly are mounted and connected onto the lower portion of the liquid-packing seal in succession; the lower end of the filling pipe and the lower end of a packing pipe are parallelly connected with the filling converter, and a liquid annulus is arranged between the filling pipe and the packing pipe. The filling tool assembly comprises an upper seal cylinder, a filling pipe external packer, and a filling sliding sleeve; the filling pipe external packer and the filling sliding sleeve are mounted and connected onto the upper seal cylinder in succession. According to the method, an open hole segment is packaged into two to ten parts; the method includes: A, tripping the filling service string in the external staged fracturing sand-control drain string; B, during filling of an upper layer, fitting a bottom packing sealing assembly and the seal cylinder to prevent filling liquid from entering a lower layer; C, repeating the step B to sequentially complete fractured gravel filling sand control for all layers.

Description

Technical field [0001] The invention relates to an open-hole sand control technology and device for oil exploitation wells, in particular to a staged fracturing sand control string and a method outside a horizontal well pipe. Background technique [0002] The Chinese patent document with the publication number CN101435321A and the publication date on May 20, 2009 discloses a "horizontal well pipe external segmented gravel packing sand control process and pipe string", which has played a role in the oil development and production process , But it also has the following shortcomings or shortcomings: The segmented packing packer is placed inside the screen, but the annulus between the sand control screen and the tubing is divided into multiple sections that are not connected to each other, and the effective separation of the intervals cannot be implemented. The process string does not have a sealing system, which is prone to interference between the filling layers. After the filli...

AI Technical Summary

Problems solved by technology

[0002] The Chinese patent document with the publication number CN101435321A and the publication date of May 20, 2009 discloses a "Segmented Gravel Packing Sand Control Technology and String Outside the Horizontal Well Pipe", which plays a role in the oil development and production process. , but it also has the following shortcomings or deficiencies: Placing the segmented packer inside the screen only divides the annulus between the sand control screen and the tubing into multiple well sections that are not connected to each other, and cannot effectively separate the intervals

Sand bridges are prone to occur when filling the general bottom of long horizontal wells, resulting in sand control failure

Images