Hydrocarbon reservoir protective agent and preparing method thereof

Abstract

The invention relates to a hydrocarbon reservoir protective agent and a preparing method thereof.The hydrocarbon reservoir protective agent contains guar gum, organosilicate, sulfomethal phenolaldehy resin, white oil, calcium salt, alkylphenol ethoxylates, sorbitan fatty acid ester, hydrolysis polyacrylonitrile amine salt and water.The preparing method comprises the steps of 1, heating and evenly mixing water, guar gum, white oil, alkylphenol ethoxylates and sorbitan fatty acid ester to obtain a first mixture; 2, adding sulfomethal phenolaldehy resin, calcium salt, methyl silicate and hydrolysis polyacrylonitrile amine salt to the first mixture and conducting stirring to obtain the hydrocarbon reservoir protective agent.The hydrocarbon reservoir protective agent has high shale hydration expansion inhibiting capacity and dispersing capacity, does not affect the rheological property of drilling fluid, can effectively prevent or delay entering of drilling filtrate into the stratum and prevent or delay pressure increase of formation pores, and prolongs the hole-wall collapsing period.

Description

technical field [0001] The invention relates to drilling technology, in particular to an oil and gas protection agent. Background technique [0002] During the drilling process, due to the existence of the positive pressure difference generated by the drilling fluid, it is difficult to avoid damage to the drilled oil and gas layers. In order to reduce the degree of damage to the oil and gas layers and finally achieve zero-damage drilling, it is necessary to carry out oil and gas layer protection drilling and completion The study of liquid systems. At present, the systems being researched and applied at home and abroad mainly include: non-invasive, positive gel (MMH), silicate, methyl glucose (MEG), formate, full oil base, synthetic base drilling and completion fluid system, etc. [0003] The most commonly used and important one among the existing oil and gas reservoir protection technologies is shielding and temporary plugging technology. However, the temporary plugging ag...

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Problems solved by technology

On the one hand, it is difficult to obtain accurate and complete pore diameter data of oil and gas layers, so the selection of particle size is blind; The selected temporary plugging agent can only achieve a good temporary plugging effect for a certain well section, so it cannot effectively protect the entire oil and gas reservoir

[0004] The existing oil layer protection agents have the following problems: ① Cationic emulsified asphalt oil layer protection agents have a great influence on the performance of drilling fluids, large deformability, poor elasticity and rigidity, poor plugging performance, and low pressure bearing capacity; ② Polymer alcohols The plugging effect of the oil layer protection agent of the type is poor, and some products foam; ③ Although the plugging performance of the oil layer protection agent of the non-permeable or ultra-low permeability type is good, the viscosity-increasing effect is remarkable and the inhibition is poor

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