High-temperature heat shock method for promoting creation of microfracture on hydraulic fracture surface of tight gas well

A hydraulic fracture and tight gas technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problem of low fracturing fluid flowback rate, reservoir water phase trap damage, fracture network density Single scale and other problems, to achieve the effect of increasing the size of the effective flow channel and reducing the processing cost

Inactive Publication Date: 2018-09-25
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

Hydraulic fracturing is the key technology to realize the economical exploitation of tight gas. Although the current hydraulic fracturing technology can greatly increase the fracture network density of tight gas reservoirs, there are still low flowback rates of fracturing fluid and room for further improvement of the fracture network

Method used

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  • High-temperature heat shock method for promoting creation of microfracture on hydraulic fracture surface of tight gas well

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Experimental program
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Embodiment Construction

[0018] (1) Collect data such as hydraulic fracturing fluid volume, proppant addition, fracturing fluid flowback rate, stimulated fracture area, and gas well water production in selected tight gas wells in the work area, and focus on judging whether the produced water continues to contain formation water. Tight gas wells that do not produce formation water continuously are treated by the high temperature heat shock method.

[0019] (2) Select the tight reservoir cores to be treated, determine the realization form of the high-temperature thermal shock method according to different gas injection methods, carry out core heating experiments under the conditions of in-situ water saturation and in-situ effective stress in the room, and determine the core permeability A significant increase in the rate corresponds to the thermal rupture threshold temperature.

[0020] (3) Based on the fracturing fluid injection and flowback conditions collected in step (1) and the hydraulic fracturing...

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Abstract

The invention discloses a high-temperature heat shock method for promoting creation of a microfracture on a hydraulic fracture surface of a tight gas well. The theory is that high-temperature gas is injected into a preferable hydrofracture tight gas well to perform high-temperature thermal treatment on the hydraulic fracture surface, thermal stress and a thermal supercharging effect are achieved by using the heterogeneity and the anisotropism of thermal expansion of rock forming minerals, thermal expansion of water vapor and the pyrolysis hydrocarbon generation effect at high temperature due to possible existence of organic matters in rocks, so that microfractures grow near the hydraulic fracture surface on reservoir rocks. The high-temperature gas is continuously and intermittently fed toextend and cut through the microfractures to form a microfracture network, thus increasing the microfracture density of a tight gas reservoir. By implementation of the method, on the basis of hydrofracturing transformation, the tight gas reservoir recovery efficiency is further improved.

Description

technical field [0001] The invention relates to the field of production stimulation and transformation of tight gas reservoirs, and relates to a method for increasing the density of a tight gas well fracture network, which belongs to the method of production stimulation and transformation in the process of tight gas exploration and development. Background technique [0002] Tight gas is playing an increasingly important role in my country's reserve growth and energy supply, and has extremely important mining value. Tight gas reservoirs are generally characterized by low porosity and low permeability. The key to effective development of tight gas and enhanced recovery is to form a fracture network in the reservoir to improve gas transmission capacity. Hydraulic fracturing is the key technology to realize the economical exploitation of tight gas. Although the current hydraulic fracturing technology can greatly increase the fracture network density of tight gas reservoirs, ther...

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Application Information

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IPC IPC(8): E21B43/24E21B43/26
CPCE21B43/2405E21B43/26
Inventor 游利军陈明君康毅力李相臣郝志伟李鑫磊苏悟
Owner SOUTHWEST PETROLEUM UNIV
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