Three-level compound petroleum yield increasing method

Abstract

The invention relates to a three-level compound petroleum yield increasing method. The method comprises the following steps that 1, a core sample is selected to conduct an acid solution ratio experiment, an acid-etched fracture conductivity experiment, and a fracture conductivity experiment of a placing propping agent, the acid solution ratio is measured through the acid solution ratio experiment, flow conductivity parameters are measured through the acid-etched fracture conductivity experiment and the fracture conductivity experiment of the placing propping agent respectively, the yield is predicted based on the measured flow conductivity parameters, and if the acid solution ratio is above 20% and the predicted yield reaches an index value, an acid fracturing, hydraulic sand fracturing and matrix acidizing three-level compound yield increasing method is selected and conducted; 2, according to the sequence of acid fracturing, hydraulic sand fracturing and matrix acidizing, the acid fracturing, hydraulic sand fracturing and matrix acidizing are conducted for increasing the petroleum yield respectively.

Description

technical field [0001] The invention relates to a method for increasing production, in particular to a method for increasing production in the petroleum field. Background technique [0002] The current stimulation methods mainly include matrix acidification, acid fracturing and hydraulic sand fracturing. Generally speaking, matrix acidizing is mainly used for sandstone and carbonate rock (sandstone or carbonate rock is generally the kind with high permeability and high pollution), and acid fracturing is mainly used for carbonate rock (low permeability or requiring Acid-etched long fractures connect different reservoirs), while hydraulic fracturing is mainly used for sandstone and other unconventional oil and gas reservoirs, such as shale gas, shale oil, coalbed methane and hot dry rock. [0003] However, the current production enhancement technology has the following problems: [0004] (1) Single type of technology. The current stimulation technology is still based on sin...

AI Technical Summary

Problems solved by technology

[0004] (1) Single type of technology

The current stimulation technology is still based on single hydraulic fracturing or acid fracturing. Sometimes matrix acidizing is applied before hydraulic fracturing technology. The purpose is only to pollute the blockage in the wellbore with acid bubbles, thereby reducing the fracture pressure of reservoir rocks.

In addition, matrix acidizing is also sometimes used in acid fracturing technology, but it is limited to multi-stage injection acid fracturing-closed acidizing technology, and in field operation, only by simply reducing some displacement and acid viscosity, in most cases there is no truly closed acidification

So far, no systematic and efficient three-stage compound stimulation technology has been proposed.

[0005] (2) The types and properties of fracturing fluid and acid are single

When fracturing or acid fracturing is carried out on site, the liquid is optimized according to only one temperature and one formula in the whole process, without considering the fact that the temperature field in the fracture gradually decreases with the progress of fracturing or acid fracturing, so it is easy to Causes additional damage to the reservoir while also maximizing the cost of fracturing or acid fracturing

[0006] (3) Fracturing or acid fracturing construction parameters are single

For example, in most cases, the construction is carried out with a constant displacement, without considering the stress state of the formation reservoir and the vertical extension of the fracture height, etc.