Pulse type fracturing sliding sleeve

Abstract

The invention relates to a pulse type fracturing sliding sleeve and belongs to the technical field of petroleum drilling tool machine design. The fracturing sliding sleeve is composed of a shell, a magnetic control device, a circulation sleeve, a circulation sliding valve and a fracturing sliding valve. A magnetic block is connected to one end of the circulation sleeve. The circulation sliding valve is connected to the other end of the circulation sleeve. The magnetic control device is installed inside the shell. A spring is arranged between the magnetic control device and the circulation sliding valve. The circulation sliding valve and the fracturing sliding valve are connected in the axial direction through a rectangular spline groove. A shearing pin is arranged in the radial direction of the circulation sliding valve and the fracturing sliding valve. According to the sliding sleeve, the shear pin is sheared under the effect of hydraulic pressure at first, then, regular vertical motion of the circulation sliding valve is achieved through power-on and power-off of the magnetic control device, then, pulse type control over the size of the perforation diameter is achieved, fracturing pulse is generated by self-oscillation of fluid inside a cavity, and the discontinuous pulse fracturing function with the pulse effect is achieved, so that the capacity of generating cracks through fracturing is improved, and the purpose of well production increment is achieved.

Description

technical field [0001] The invention relates to a pulse type fracturing sliding sleeve, which belongs to the technical field of mechanical design of petroleum drilling tools. Background technique [0002] With the increase of the proportion of low-permeability reservoirs in my country, the development efforts are also increasing. In the existing fracturing technology, whether it is conventional hydraulic fracturing or composite fracturing and other fracturing methods, although the formation can be fractured to a certain extent to achieve oil recovery through fracturing. However, in low-permeability reservoirs, it is often difficult to effectively increase the distance of rock fractures and prolong the distance of fractured fractures, so as to improve the ability of fractures generated by fracturing, so as to achieve the purpose of oil and gas well stimulation. At present, the fracturing technology is relatively mature, and the commonly used fracturing technologies mainly in...

AI Technical Summary

Problems solved by technology

Although hydraulic fracturing can increase the number and length of fractures in production layers and improve the permeability of oil and gas reservoirs, the production declines rapidly after oil and gas well fracturing, making it difficult to stabilize production

Although liquid chemical fracturing can effectively improve the fracturing effect, this method is not very mature in technology at present, and the damage to casing is relatively large. Generally, this method is not used for casing completion to stimulate natural gas layers.

Although composite perforation can form many small micro-fractures in the near-wellbore area through the high-energy gas pressure generated by the gunpowder explosion, which can improve the seepage capacity of the near-wellbore area, and the high-energy gas can also play a role in scouring the perforation channels, making the near-wellbore area However, due to the formation of the compaction zone and solid phase plugging during the perforation process, the flow resistance of the formation fluid to the perforation usually increases, thereby reducing the production capacity of the gas well

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