Fracturing method for increasing effective supporting length of crack

Abstract

Disclosed is a fracturing method for increasing the effective supporting length of a crack. A hydraulic sandblaster is put downward to a purpose layer section through an oil pipe; the hydraulic sandblaster is aligned to a preset oil layer position, and sand blasting perforation is conducted with the speed being 160-220 m / s; after perforation work is completed, a sand carrying fluid of a hybrid supporting agent is injected into a stratum with the construction displacement being larger than 4 m<3> / min; and the sand carrying fluid conducts alternating injection of the supporting agent and slickwater with the time interval being 60-300 s, and hydraulic fracturing transformation of a reservoir is completed. According to the fracturing method for increasing the effective supporting length of the crack, aiming at the oil field production increasing technology of the reservoir with the permeability being smaller than 0.1 millidarcy and on the basis of avoiding excessive extending of the crack height, the effective supporting length of the artificial crack is increased by 30% or above, and the purposes of increasing the effective transformation volume of the crack and increasing the oil well yield are achieved.

Description

technical field [0001] The invention belongs to the field of oil field development, and in particular relates to a fracturing method for increasing the length of effectively supported fractures. Background technique [0002] With the continuous deepening of oilfield exploration and development, the proportion of tight oil reservoirs represented by long 6-8 layers in the Ordos Basin is increasing, and more than 1,000 similar oil wells need hydraulic fracturing every year. How to improve this Single well production of similar oil reservoirs has become the core issue in the field of oil and gas well stimulation. However, due to the tightness and fine pore throats of this type of reservoir, in order to reduce reservoir damage and increase the drainage volume of artificial fractures, the use of slick water fracturing fluid has become an inevitable choice for oilfield engineers. However, the suspension performance of slick water fracturing fluid proppant is limited, and the propp...

AI Technical Summary

Problems solved by technology

In order to obtain the effective support fracture length and greatly increase the construction displacement, field practice shows that the improvement effect from the above three aspects is limited, and at the same time it will cause the fracture height to be excessively extended, and the effect is often counterproductive; the proppant density is closely related to its conductivity. The proppant with too low density cannot meet the conductivity requirement of oil field fracturing; the increase of the viscosity of the sand-carrying fluid will increase the damage to the reservoir, so it is not suitable as a fracturing fluid system for hydraulic fracturing of tight reservoirs

Images