Open hole packer staged fracturing string with accurate crack distribution and use method

Abstract

The invention discloses an open hole packer staged fracturing string with accurate crack distribution and a use method. The open hole packer staged fracturing string comprises a main oil pipe, whereina plurality of sliding sleeves distributed at intervals are connected to the main oil pipe; a plurality of packer groups are further connected to the main oil pipe; the packer groups correspond to the sliding sleeves one to one; each packer group comprises two packers connected to the main oil pipe; and the two packers are connected to the two sides of the sliding sleeves respectively to clamp the corresponding sliding sleeves in the middle. The crack initiation position of a crack is limited through the packer groups, the ideal layout of the crack can be realized, the purpose of balanced transformation of a reservoir is achieved, the contact area between fracturing fluid and an open hole stratum can be remarkably reduced, the filtration loss of the fracturing fluid is effectively reduced, and the crack forming effect of the fracturing fluid is improved.

Description

technical field [0001] The invention belongs to the technical field of staged fracturing of oil and gas wells, and in particular relates to an open-hole packer staged fracturing string with precise fracture distribution and a use method thereof. Background technique [0002] In order to improve the productivity of single well, the development technology of horizontal well and sidetracking horizontal well has been developed rapidly in major oil fields in the world. Open hole packer staged fracturing is a mainstream fracturing technology for horizontal wells and sidetracked horizontal wells. Open hole packer staged fracturing technology can save casing and reduce development costs, especially for slim horizontal wells where casing cementing is not convenient, open hole packer staged fracturing technology shows unique advantages. [0003] The current open-hole packer staged fracturing string structure is basically a string structure in which sliding sleeves and packers are alt...

AI Technical Summary

Problems solved by technology

[0004] This string structure has the following significant disadvantages: 1) After the fracturing fluid enters the open hole from the sliding sleeve, the length of the open hole in contact with it is too long (equal to the length of each section), and the contact area between the fracturing fluid and the open hole is large. The fluid loss is very fast, which affects the fracture creation effect of the fracturing fluid

Although each sliding sleeve is generally in the middle of the section, any part between the packers at both ends of the section is subject to this pressure, so it is possible to open the fracture (fracture initiation) at any position in the section. The location is affected by in-situ stress and natural fractures), so the actual location of the crack is unpredictable, often not the location of the sliding sleeve, and there may be two adjacent cracks that are very close to a seal The position of the packer, even two fractures close to a certain packer are connected in the formation after extending

Therefore, this pipe string structure is likely to lead to problems such as unbalanced crack layout and poor reconstruction effect.

Images