Differential pressure sliding sleeve, and oil and gas well fracturing construction method using same

A differential-pressure sliding sleeve, comprising:

• an outer cylinder, with a flow guiding hole being provided in a wall of the outer cylinder;
• an inner cylinder arranged in an inner cavity of the outer cylinder, wherein in an initial state, the inner cylinder and the outer cylinder are fixed to each other to close the flow guiding hole;
• an upper joint extending into the inner cavity of the outer cylinder and fixedly connected to an upper end of the outer cylinder, wherein a clearance is formed between a lower end surface of the upper joint and an axial upper end surface of the inner cylinder;
• a lower joint extending into the inner cavity of the outer cylinder and fixedly connected to a lower end of the outer cylinder;
• and
• a carrier ring arranged in the inner cavity of the outer cylinder and between the lower joint and the inner cylinder, the carrier ring being dissolvable under an action of working fluid,
• wherein an area of the axial upper end surface of the inner cylinder is greater than that of an axial lower end surface thereof, so that the working fluid generates a pressure difference between the axial upper and lower end surfaces of the inner cylinder to provide a downward pressure for the inner cylinder, which moves downward under the pressure after the carrier ring is dissolved to open the flow guiding hole,
• wherein the flow guiding hole is filled with a filler, a protective element is arranged radially outside of the filler, at least one guiding hole is arranged on the protective element, and
• wherein the size of the at least one guiding hole is smaller than that of the flow guiding hole.