Proppant Suspension Parameter Optimization Method and Suspension Method Based on Bubble Bridge Effect

Abstract

The invention discloses a proppant suspending parameter optimization method and a suspending method based on the bubble bridge effect, comprising the following steps: selecting a proppant, and performing hydrophobic modification on its surface to obtain a surface hydrophobically modified proppant; configuring it to be soaked in water base fracturing fluid base fluid; according to the average radius of the proppant and the average radius of the bubbles of the base fluid, the base fluid is optimized for the first time; according to the interaction between the proppant particles and the bubble interface after the surface hydrophobic modified proppant is mixed with the base fluid According to the action energy, the base fluid optimized for the first time is optimized for the second time; according to the apparent density of the formed proppant-bubble aggregates, the base fluid optimized for the second time is optimized for the third time. The optimized basic parameters of the foam-forming water-based fracturing fluid base fluid are the preferred parameters for proppant suspension. The invention establishes an experimental evaluation and parameter calculation and optimization process for suspending fracturing proppant by using the bubble bridge effect on the hydrophobic surface, and can realize efficient suspension of proppant by adjusting related parameters.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir stimulation and reconstruction, in particular to a method for optimizing the suspension parameters of a proppant based on the bubble bridge effect and a suspension method. Background technique [0002] Hydraulic sand fracturing is currently the main stimulation measure for unconventional oil and gas reservoirs. During the fracturing process, the proppant (ceramsite, quartz sand, etc.) is carried into the fracture by the fracturing fluid, ensuring that after the fracturing pump is stopped, the fracture can remain open under the action of the formation closing stress, expand the oil and gas flow channel of the reservoir, and realize the stimulation of production. Purpose. However, the density of the proppant is often significantly greater than the density of the fracturing fluid, and the proppant will inevitably settle under the action of gravity, resulting in uneven distribution of t...

AI Technical Summary

Problems solved by technology

However, the density of the proppant is often significantly greater than the density of the fracturing fluid, and the proppant will inevitably settle under the action of gravity, resulting in uneven distribution of the proppant in the fracture, that is, the concentration at the bottom of the fracture is high vertically, and the concentration at the top is low or even There is no proppant; the concentration near the wellbore is high in the horizontal direction, and the concentration at the far end of the fracture is low or even no, which seriously restricts the opening of fractures and the effect of fracturing stimulation

[0003] Existing methods mostly use increasing fracturing fluid viscosity, viscoelasticity, and fracturing fluid pumping speed to improve proppant carrying and transportation effects, but such methods have high material costs, high requirements for pumping power equipment, and high potential reservoir damage. Defects, and with the continuous expansion of hydraulic fracturing, it is becoming more and more difficult to meet the needs of on-site fracturing technology

Another way is to reduce the proppant density to make the proppant easier to carry, such as manufacturing hollow ceramsite, low-density resin proppant, expanded polymer wrapped proppant, etc., but these methods are often due to high cost or too much damage to the formation. High but not widely used

[0004] Prior art CN110724515A discloses an air suspension agent for fracturing proppant and its construction method. Although it discloses a gas suspension agent for fracturing proppant, how to use the air suspension agent to suspend sand and realize high-efficiency carrying How to determine the performance and index parameters of fracturing fluid according to the proppant characteristics, how to evaluate the stability of the fracturing fluid base fluid-bubble-proppant three-phase suspension system, there is still a lack of feasible technical guidance in related fields, which seriously restricts the development of fracturing fluid. Popularization and application of technology of splitting liquid and gas suspended sand

Images