Preparation method and application of carbonized rice hull powder particle control and flooding agent

Abstract

The invention provides a preparation method and application of a carbonized rice hull powder particle control and flooding agent. The preparation method comprises the following steps: (1) weighing a certain amount of rice hull and putting the rice hull into a carbonization tank; (2) putting the carbonization tank into a constant-temperature curing box, adjusting heating temperature to 200-270 DEG C, and carrying out carbonization treatment on the rice hull at the constant temperature for 2-3 h; and (3) taking out the carbonized rice hull, cooling the rice hull and finally crushing and screening so as to obtain the carbonized rice hull powder particle control and flooding agent. According to the preparation method of the carbonized rice hull powder particle control and flooding agent, rice hull is commercially available in quantity, and the carbonization processing is simple and easy to operate. The preparation method belongs to refuse reclamation and is low-cost. In comparison with other control and flooding agents, the prepared carbonized rice hull powder particle control and flooding agent is nontoxic and harmless and is green and environment-friendly. After the carbonized rice hull powder particle control and flooding agent is blended with an aqueous solution of partially hydrolyzed polyacrylamide polymers according to a certain mass ratio, the profile control plugging rate of deep-bed formation large-pores can reach 90% and above.

Description

technical field [0001] The invention belongs to the field of profile control and water shutoff of oil-water wells, and in particular relates to a preparation method and application of a carbonized rice husk powder particle control and displacement agent. Background technique [0002] Polymer flooding for tertiary oil recovery in oilfields improves the oil recovery by increasing the viscosity of the water phase, reducing the mobility ratio of water to oil, and increasing the sweep coefficient of the drive fluid. However, before the development of polymer injection, the polymer injection blocks generally have undergone years of water injection development, and there are already high permeability zones or large pores in the formation. During the polymer injection process, the polymer solution is easy to finger or channel along the high-permeability zone with low resistance and large pores, and is produced in the corresponding oil well, which reduces the swept volume of the inje...

AI Technical Summary

Problems solved by technology

[0006] 1) As the international oil price continues to slump, the cost of various production increase measures in the oil field is severely squeezed, and the cost of plugging control agent needs to be lower;

[0007] 2) After multiple rounds of profile control and flooding in most oil wells, especially in the polymer flooding process of tertiary oil recovery, the damage to the formation pores is intensified, and the formation large pores are widely developed away from the wellhead, requiring large doses of The plugging modifier injected in deep, meanwhile, the plugging modifier cannot have adverse effects such as viscosity reduction on polymer displacement in tertiary oil recovery;

At the same time, because the carbonization temperature is too high, the rice husk loses too much water, causing the rice husk to be brittle and the rigidity is too low. The commercially available carbonized rice husk powder does not have the basic ability to increase the water shutoff strength by physically blocking the formation pores with the particles used for control and flooding. performance