A staged fracturing and water control well completion method and a pipe string and downhole sliding sleeve switch system

Abstract

The invention provides a segmental fracturing and water control completion method, a pipe column and a downhole sliding sleeve switching system, and belongs to the technical field of oil and gas wellcompletion and production. The method includes the following steps that 1, the pipe column is placed, wherein the pipe column is put downwards to a predetermined position, and well cementation or packer pressure holding and sealing; 2, first stage fracturing is performed, wherein pressure holding is performed in a casing pipe, first-stage switch sliding sleeves are opened for fracturing, and afterfracturing, the switch sliding sleeves are kept in an opening state under static pressure by pressure holding; 3, the downhole sliding sleeve switching system is placed, wherein the primary-stage sliding sleeve is closed, the next-stage sliding sleeve is opened, and fracturing is performed; 4, the step 3 is repeated until all stages of fracturing are completed; 5, production is performed, whereinthe downhole sliding sleeve switching system is put downwards, and the switch sliding sleeves of all stages are opened for production; 6, water control is performed, wherein after water comes out from one fracturing segment in the later period, the downhole sliding sleeve switching system is put downwards to close the corresponding switch sliding sleeve, the rest segments continues to be produced, and thus the segmental completion function is achieved.

Description

technical field [0001] The invention belongs to the technical field of well completion and production of oil and gas wells, and in particular relates to a staged fracturing and water control well completion method and a pipe string and downhole sleeve switch system. Background technique [0002] With the exploration and development of unconventional oil and gas resources such as shale gas and shale oil, the staged fracturing technology of horizontal wells has been effectively implemented. Reservoir fracturing technology is to divide horizontal wells such as shale oil and gas and tight rock formations into multiple sections, and then fracture the formation into multiple fractures to expand the oil drainage area of ​​oil and gas production layers, improve oil and gas recovery, and thus increase single well production . Horizontal well open-hole staged fracturing technology is a kind of reservoir fracturing and widely used in unconventional oil and gas fields at home and abroa...

AI Technical Summary

Problems solved by technology

At present, the main multistage and staged fracturing technologies are multistage ball sliding sleeve staged fracturing technology, hydraulic jet staged fracturing technology, pumped composite cable bridge plug staged fracturing technology and Schlumberger’s staged fracturing technology. TAP staged fracturing technology, etc., but there are different problems such as limited number of staged stages, limited pipe diameter, limited construction scale, slow construction speed, and inability to control production after production stimulation construction.

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