Cementation and fracture technique string and cementation and fracture technique process

Abstract

The invention discloses a cementation and fracture technique string and a cementation and fracture technique process. The cementation and fracture technique string sequentially comprises a float shoe, a float collar, a collision base, a cementation pressure differential sliding sleeve and a cementation dropping sliding sleeve from bottom to top, wherein the float shoe, the float collar, the collision base, the cementation pressure differential sliding sleeve and the cementation dropping sliding sleeve are connected through a casing pipe, and the cementation pressure differential sliding sleeve is provided with a constant pressure valve. The cementation and fracture technique process comprises the steps of a well cementation process including tripping the cementation and fracture technique string into a wellhead, pouring cement paste into the cementation and fracture technique string, and waiting on cement setting after a rubber plug moves to the collision base, and a fracture process including pressurizing the cementation and fracture technique string from the ground to open the constant pressure valve arranged on the cementation pressured differential sliding sleeve and then performing fracture. The cementation and fracture technique string is low in rigidity, can be tripped into stratums very conveniently, and meanwhile can achieve good packing effects.

Description

technical field [0001] The invention relates to the field of well completion technology in the petroleum industry, in particular to a cementing and fracturing process string and a cementing and fracturing process flow. Background technique [0002] With the development of unconventional oil and gas reservoirs and shale gas projects, reservoir stimulation technology has received more attention and research in oilfield development. [0003] At present, there are three main types of multi-stage fracturing methods for cased wells in domestic oilfields: one is the open-hole staged fracturing technology, which uses open-hole packers to achieve isolation between layers, and completes multi-stage fracturing by sequentially opening the fracturing sleeves. The second is the hydraulic jet fracturing technology, which uses hydraulic jet fracturing tools to perform hydraulic jet perforation, realizes interlayer isolation through the hydraulic jet effect, and completes multi-stage reconst...

AI Technical Summary

Problems solved by technology

[0004] Open-hole staged fracturing technology and hydraulic jet fracturing technology can realize the completion and fracturing of a string, but the process operation is relatively complicated. Wells are not suitable for unstable formations; the open hole packer has limited ability to isolate the water layer, and is affected by the structure of the pipe string, and the subsequent secondary stimulation space is limited

[0005] Bridge plug + perforation technology has unlimited stages, bridge plug can be drilled to achieve full diameter, but the process is complicated, construction is difficult, construction period is relatively long, and fracturing fluid stays in the reservoir for a long time , great damage to the reservoir

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