Multi-stage multi-fracture fracturing method for horizontal wells

Abstract

The invention discloses a multi-stage, multi-gap and multi-section fracturing method for a horizontal well. The method comprises the steps of 1) determining the quantity of fracturing sections and grading number after the casing cementing and completion, and determining setting positions of sectional packers and a grading perforation position; 2) performing directional perforation process to perforate 7 to 10 holes at each grade under a slurry condition, wherein the holes are 8mm in diameter; 3) separating the internal space of a wellbore casing by a segmentation tool after perforation, so as to achieve horizontal well segmentation; 4) determining the maximum discharge, construction pressure and other sand fracturing parameters during fracturing construction; 5) feeding ball to set all packers, and sequentially fracturing a plurality of horizontal sections according to the matching relationship between a starting ball, a sand injection sliding sleeve and a ball receiving seat, so as to achieve multi-stage multi-gap fracturing of the horizontal well. With the adoption of the method, the fracturing reconstruction which increases artificial gaps is done on the premise that the packers are not increased; therefore, the construction effect can be ensured, and moreover, the working degree in the whole well section can be obviously raised, and the cost of fracturing construction is low.

Description

technical field [0001] The invention relates to oil and gas well fracturing stimulation technology, in particular to a multi-stage, multi-fracture and staged fracturing method for horizontal wells. Background technique [0002] In recent years, the use of horizontal well technology combined with staged fracturing technology has become the most effective means for efficient development of tight oil and gas reservoirs. The staged fracturing reconstruction of conventional horizontal wells realizes multi-stage fracturing of horizontal well sections by increasing the number of packers and sandblasting sliding sleeves, forming multiple sand-filled fractures to expand the drainage area of ​​oil and gas wells, thereby increasing single well productivity . Due to the limitation of the wellbore size of the horizontal well and the outer diameter of the tool, this method can only determine the number of stages based on the number of packers, and cannot increase the number of artificial...

AI Technical Summary

Problems solved by technology

In addition, due to the large number of downhole tools for multi-section construction, the choke friction during the construction of long horizontal section horizontal wells will limit the construction displacement at the toe end, resulting in insufficient reservoir stimulation and affecting the productivity of a single well