Oil well reservoir fracture plugging agent, and preparation method and application thereof

[0043] The components and weight ratio of the drilling lost circulation agent are: 14% of nylon 66, 15% of DSP-2, 34% of No. 90 asphalt, 14% of delayed expansion agent YH-14%, and 33% of calcium carbonate particles.

[0044] Wherein the components and weight ratio of nylon 66 are: 15-25mm nylon 6675%, 5-15mm nylon 6625%. The composition and weight ratio of No. 90 asphalt are: 50% of No. 90 asphalt of about 1mm, 25% of No. 90 asphalt of about 3mm, and 25% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 85% of the 200-mesh superfine calcium particles and 15% of the 3-4mm calcium carbonate particles.

[0045] When preparing, first add DSP-2 into water to fully dissolve to form a base slurry with a viscosity of 100-120S, and then mix it with other components in the formula evenly.

[0046] Aiming at the leakage in the completion process of buried hill wells, the plugging product prepared above was used for a pressure test, ...

[0053] Nanpu 23-P2006 is a development well in the buried hill reservoir of Nanpu No. 2 structure, and the main target interval is the Ordovician oil and gas layer in the buried hill. On April 26, 2011, when the well was drilled at a depth of 5235 meters, a leak in a buried hill fracture occurred, and loss of return occurred. The plugging slurry was prepared according to the following formula: nylon 6615%, DSP-210%, No. 90 bitumen 25%, delayed expansion agent YH-14%, calcium carbonate particles 35%, the balance is water.

[0054] Wherein the components and weight ratio of nylon 66 are: 15-25mm nylon 6660%, 5-15mm nylon 6640%. The composition and weight ratio of No. 90 asphalt are: 45% of No. 90 asphalt of about 1mm, 30% of No. 90 asphalt of about 3mm, and 25% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 75% of the 200-mesh superfine calcium particles and 25% of the 3-4mm calcium carbonate particles.

[0055] Pump th...

[0062] Well Gao 3102-9 is a planned well with three openings and five intervals on the Gao 96 platform. When the well was drilled to 3756 meters, a loss of return occurred suddenly; after two conventional plugging failed, the plugging was carried out according to the following formula: nylon 6610 %, DSP-25%, No. 90 asphalt 25%, delayed expansion agent YH-15%, calcium carbonate particles 34%, and the balance is water.

[0063] The composition and weight ratio of the fiber material are: 15-25mm nylon 6670% and 5-15mm nylon 6630%. The composition and weight ratio of No. 90 asphalt are: 55% of No. 90 asphalt of about 1mm, 25% of No. 90 asphalt of about 3mm, and 20% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 65% of the 200-mesh superfine calcium particles and 35% of the 3-4mm calcium carbonate particles.

[0064] The prepared plugging slurry was pumped into the leaky layer, and the leak plugging was stopped when the dri...