Proppant suspension parameter optimization method based on bubble bridge effect and suspension method

Abstract

The invention discloses a proppant suspension parameter optimization method based on a bubble bridge effect and a suspension method, and the method comprises the following steps: selecting a proppant, and carrying out hydrophobic modification on the surface of the proppant to obtain a surface hydrophobic modified proppant; preparing base fluid of the water-based fracturing fluid; preferably selecting the base fluid for the first time according to the average radius of the proppant and the average radius of bubbles of the base fluid; according to the interaction energy of proppant particles and a bubble interface after the surface hydrophobic modification proppant and the base fluid are mixed, optimizing the base fluid selected for the first time for the second time; according to the apparent density of the formed proppant-bubble aggregate, optimizing the base fluid selected for the second time for the third time, wherein the basic parameters of the base fluid, selected for the third time, of the bubble-forming water-based fracturing fluid are optimal parameters of proppant suspension. According to the method, an experimental evaluation and parameter calculation optimization process for suspending the fracturing propping agent by utilizing the hydrophobic surface bubble bridge effect is established, and efficient suspension of the propping agent can be realized by adjusting related parameters.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir stimulation and transformation, in particular to a method for optimizing proppant suspension parameters and a suspension method based on the bubble bridge effect. 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 to ensure that after the fracturing pump is stopped, the fracture can still be kept open under the closure stress of the formation, expanding the oil and gas flow channels in the reservoir, and achieving production increase 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 the proppant in...

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