Method for developing heavy oil reservoirs by combining staged volume fracturing and fracturing-packing in horizontal wells

Abstract

The invention provides a method for developing a heavy oil reservoir of a horizontal well by combining staged volume fracturing and fracturing filling. According to the method, firstly, a steam injection well is deployed at the bottom of the oil reservoir; a production well is deployed at the middle upper part of the oil reservoir; then, the volume fracturing or fracturing filling operation is performed according to the porosity degree and seepage rate distribution condition of the two horizontal wells; then, the two wells form heat communication in a steam throughput mode; next, the two wells transfer to continuous steam injection production; and the production is stopped when the oil-steam ratio is lowered to 0.1. According to the invention, a fracture net system is formed in a compact region by the volume fracturing, so that the seepage capability of the oil reservoir is improved; the fracturing filling process is used in a high-porosity and high-permeability region for performing compaction so as to reduce a formation sand production phenomenon; the seepage mode of a low-permeability region oil reservoir is converted from the single seepage to the sewage and fracture laminar flow; meanwhile, a high-permeability region is filled with small-grain-size sand for filling loose reservoir sandstone particle pores, so that the permeability near the production well is reduced,the oil reservoir anisotropy is reduced and the whole oil reservoir can be uniformly used and developed.

Description

technical field [0001] The method belongs to the technical field of oil field recovery, and in particular relates to a method for developing a heavy oil reservoir by combining staged volume fracturing and fracturing filling in a horizontal well. Background technique [0002] Heavy oil reservoirs refer to reservoirs with a degassed crude oil viscosity greater than 100mPa·s at the reservoir temperature. At present, horizontal well technology is widely used in the development of domestic heavy oil fields. The oil production methods include: steam-assisted gravity drainage, steam huff and puff, steam flooding and other technologies. The steam-assisted gravity drainage technology requires that the thickness of the oil layer must be greater than 15m, the property of the reservoir is relatively uniform, and the interlayer is discontinuous. In order to promote the thermal communication and fluid flow between the two wells, it is required to deploy two horizontal wells in parallel at...

AI Technical Summary

Problems solved by technology

Horizontal well steam flooding also has the characteristics of small application range, high requirements on reservoirs, easy steam channeling, and poor production effect.

Horizontal well steam huff and puff can be widely used in heavy oil reservoirs with different conditions, but there are problems such as small huff and puff production range, low recovery rate, and inability to supplement formation energy, etc.

It is difficult to expand the steam cavity in the low-permeability area, and it is easy to form a large dead oil area, and it is easy to form sand burial and voids near the production well, which will further aggravate the heterogeneity and make the development effect worse