3 results about "Water wet" patented technology

The application discloses a multifunctional plugging removing agent for oil extraction and acidification of oil fields and a preparation method thereof. The plugging removing agent comprises the following raw materials in percentage: 10-15% of hydrochloric acid, 5-8% of formic acid, 5-8% of citric acid, 0.3-0.5% of OP-10 and 1-1.5% of a modified additive, and the balance is water. In the using process of the acidification plugging removing agent, the modified additive can reduce the interfacial tension, change the rock surface into water wettability, make the residual acid after reaction and loose particles more easily carried back, significantly improve the permeability recovery rate, the nano silicon dioxide in the modified additive can fill the cavity of the surface polysiloxane chain segment, can prevent the curling of the polysiloxane chain segment and the collapse of the network structure, and further improve the salt resistance of the modified additive, ensure the penetration effect of the acid liquid, the cage type silsesquioxane structure on the surface can form a dense three-dimensional network, greatly improve the mechanical strength, shear resistance and long-term thermal stability of the oil displacement system, and is not easy to degrade and fail.

The invention relates to a shale oil reservoir rock different-scale pore throat wettability quantitative evaluation method which comprises the following steps: (1) cutting a rock core into two equal-length standard plunger sample rock cores C1 and C2, drying the rock cores C1 and C2, and determining a dry sample nuclear magnetic resonance T2 spectrum of the rock cores C1; (2) respectively saturating the core C1 and the core C2 with oil and heavy water, and then measuring the nuclear magnetic resonance T2 spectrum of the core C1 and the core C2; (3) respectively self-absorbing heavy water and oil by the rock core C1 and the rock core C2, and then measuring the nuclear magnetic resonance T2 spectrum; (4) drying the rock core C2, and measuring the nuclear magnetic resonance T2 spectrum of the rock core C2 after the rock core C2 is saturated with oil; (5) drying the rock core C1 and carrying out a high-pressure mercury injection test on the rock core C1; and (6) quantitatively evaluating the wettability of the whole rock core and pore throats with different scales. The method can quantitatively characterize the proportions of water-wetted, oil-wetted and neutral-wetted pore throats in different scales and the whole pore throats aiming at the pore throats of saturable oil in the rock core, so as to realize wettability evaluation.

The present application relates to the technical field of oil and gas well cementing engineering, and particularly relates to a cementing cement microcrack self-repairing material, a preparation method and application thereof. The cementing cement microcrack self-repairing material is prepared by using an emulsion copolymerization method, and the raw material composition comprises the following components in parts by weight: deionized water 30 parts, monomer 3-12 parts, crosslinking agent 0.03-0.09 parts, initiator 0.06-0.3 parts, natural latex 3-20 parts, surfactant 1.5-3 parts, and filler 0.03-1.5 parts. The self-repairing material obtained by the present application has high liquid absorption rate in a weak acid solution, high swelling rate in the presence of carbon dioxide, and excellent mechanical properties. The self-repairing material can be added into a cementing fluid system, and is used in the environment of supercritical CO2 and CO2 formation water, two kinds of corrosive media in a water-wet environment, to seal the leakage channel of a wellbore and improve the sealing integrity of the wellbore.