CN-121991657-A - Pressure response type activator and plugging liquid containing same

CN121991657ACN 121991657 ACN121991657 ACN 121991657ACN-121991657-A

Abstract

The invention provides a pressure response type activator and plugging liquid containing the same. The pressure response type activator is in a core-shell structure, wherein the core material comprises silicate, alkali and carbonate, and the shell material comprises at least one of styrene, pyrrole and methyl methacrylate. The plugging liquid comprises the pressure response type activator, bridging particles, fibers, a curing agent, a diluent, a base liquid and an optional density regulator.

Inventors

LIU LIAN
HE YINGZHUANG
LU FEIFEI
WU JIARONG
LI WENXIA
CHEN XIUPING

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司西北油田分公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. A pressure response activator is a core-shell structure, wherein a core material comprises silicate, alkali and carbonate, and a shell material comprises at least one of styrene, pyrrole and methyl methacrylate.
2. The pressure responsive activator of claim 1, wherein the pressure responsive activator is prepared by: 1) Mixing silicate, alkali and carbonate to obtain active component of activator; 2) Adding the active component of the activator, persulfate, alcohol and surfactant into an organic solvent, and emulsifying to obtain a first emulsion; 3) Heating the first emulsion to 35-55 ℃ under the condition of a first inert gas, and then adjusting the pH value to 3-5 to obtain a second emulsion; 4) After mixing water and shell material components, dripping the mixture into the second emulsion, reacting the mixture under the condition of a second inert gas, and then washing and drying the mixture to obtain the pressure-responsive activator; Wherein 100% by mass of the total mass of the silicate, the alkali and the carbonate, 40% to 50% by mass of the silicate, 20% to 25% by mass of the alkali, 25% to 40% by mass of the carbonate, 100 parts by mass of the organic solvent, 7 to 15 parts by mass of the activator active component, 0.35 to 0.5 part by mass of the persulfate, 3 to 5 parts by mass of the alcohol, 2.5 to 3 parts by mass of the surfactant, 2 to 4 parts by mass of the shell material, and 0.2 to 0.5 part by mass of the water.
3. A curable lost circulation fluid comprising the pressure responsive activator of claim 1 or 2, bridging particles, fibers, a curing agent, a diluent, a base fluid, and optionally a density modifier.
4. A curable plugging fluid according to claim 3, wherein said bridging particles comprise at least one or at least two of vermiculite, calcium carbonate powder, rubber powder, walnut shells, quartz sand, cotton seed hulls, and resin microspheres; Preferably, the bridging particle size is 1/2 to 2/3 of the average pore diameter or average fracture width.
5. A curable plugging fluid according to claim 3, wherein said fibers comprise at least one of polyacrylonitrile fibers, basalt fibers, asbestos fibers, and polypropylene fibers.
6. A curable plugging fluid according to claim 3, wherein said curing agent comprises slag; Preferably, the solidifying agent includes at least one of S75 grade furnace water quenched slag, S95 grade furnace water quenched slag, or S105 grade furnace water quenched slag.
7. A curable lost circulation fluid according to claim 3, wherein the diluent comprises sulphonated tannins and/or sodium lignin sulfonate.
8. A curable lost circulation fluid according to claim 3, wherein the base fluid comprises a first polymer, a second polymer, an inorganic suspending agent, a retarder and water.
9. The curable plugging fluid of claim 8, wherein said first polymer is at least one of 2-acrylamide-2-methylpropanesulfonic acid-N-vinylpyrrolidone-acrylamide copolymer, 2-acrylamide-2-methylpropanesulfonic acid-sulfonated styrene-maleic anhydride copolymer and 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid-acrylamide copolymer, polyacrylamide, carboxymethyl cellulose, modified hydroxyethyl cellulose, and/or The second polymer is at least one of polyacrylamide, carboxymethyl cellulose and modified hydroxyethyl cellulose, and/or The inorganic suspending agent comprises at least one of red mud, diatomite, bentonite and attapulgite, and/or The retarder is at least one of 2-acrylamide-2-methylpropanesulfonic acid-itaconic acid-N-ethylacrylamide copolymer, 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid-maleic anhydride copolymer, 2-acrylamide-2-methylpropanesulfonic acid-itaconic acid-maleic anhydride copolymer and 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid-N-ethylacrylamide copolymer.
10. A curable plugging fluid according to claim 3, wherein said density modifier comprises at least one of barite, iron ore powder, hollow glass microspheres, hollow ceramic microspheres, fly ash, expanded perlite powder, titanium iron ore powder.

Description

Pressure response type activator and plugging liquid containing same Technical Field The invention relates to the field of petroleum exploitation, in particular to a pressure response type activator and plugging liquid containing the same. Background In the prior art, bridge plugs formed by bridge plugging agents are often subjected to alternating stress, bridge particles cannot be solidified or crosslinked to form enough internal friction force, a packing belt is damaged to cause secondary leakage in the process of continuing drilling, high-water-loss materials are used for plugging, poor sedimentation stability exists, the materials are easy to deposit in tank bottoms, pipelines and drill pipes after being stationary, the pipelines and the drill pipes are blocked to cause secondary complex accidents and the like, cementing materials are used for plugging, the risk of contact pollution between the cementing materials and drilling fluid is existed, additional underground complex accidents such as slurry mixing and solidification, early thickening and the like can be caused, conventional activators are alkaline activators, the problem of conflict of the addition amount of activators and the retarder is often faced, pressure response microcapsules cannot realize rapid release of core materials under certain pressure, cement slurry is used for plugging, the risk of contact pollution between cement slurry and the drilling fluid can cause accidents such as slurry mixing and solidification, early thickening and the like. Disclosure of Invention One of the invention provides a pressure response type activator which is of a core-shell structure, wherein a core material comprises silicate, alkali and carbonate, and a shell material comprises styrene, pyrrole and methyl methacrylate. In one embodiment, the pressure responsive activator is prepared by the steps of: 1) Mixing silicate, alkali and carbonate to obtain active component of activator; 2) Adding the active component of the activator, persulfate, alcohol and surfactant into an organic solvent, and emulsifying to obtain a first emulsion; 3) Heating the first emulsion to 35-55 ℃ under the condition of a first inert gas, and then adjusting the pH value to 3-5 to obtain a second emulsion; 4) After mixing water and shell material components, dripping the mixture into the second emulsion, reacting the mixture under the condition of a second inert gas, and then washing and drying the mixture to obtain the pressure-responsive activator; Wherein 100% by mass of the total mass of the silicate, the alkali and the carbonate, 40% to 50% by mass of the silicate, 20% to 25% by mass of the alkali, 25% to 40% by mass of the carbonate, 100 parts by mass of the organic solvent, 7 to 15 parts by mass of the activator active component, 0.35 to 0.5 part by mass of the persulfate, 3 to 5 parts by mass of the alcohol, 2.5 to 3 parts by mass of the surfactant, 2 to 4 parts by mass of the shell material, and 0.2 to 0.5 part by mass of the water. In one embodiment, the silicate is sodium silicate and/or potassium silicate. In one embodiment, the base is sodium hydroxide and/or potassium hydroxide. In a specific embodiment, the carbonate is sodium carbonate and/or potassium carbonate. In a specific embodiment, the persulfate is sodium persulfate and/or potassium persulfate. In a specific embodiment, the alcohol is n-butanol and/or isopropanol. In one embodiment, the surfactant is span 80 and/or sodium dodecyl sulfate. In one embodiment, the organic solvent is at least one of chloroform, mineral oil, and carbon tetrachloride. In one embodiment, the first inert gas and the second inert gas are at least one of nitrogen, argon, or helium. The second invention provides a curable plugging fluid comprising the pressure-responsive activator, bridging particles, fibers, curing agents, diluents, base fluid and optionally density modifiers according to one of the invention. In one embodiment, the bridging particles comprise at least one or at least two of vermiculite, calcium carbonate powder, rubber powder, walnut shells, quartz sand, cotton seed hulls, and resin microspheres. In a specific embodiment, the bridging particle size is 1/2 to 2/3 of the average pore diameter or average crack width. In one embodiment, the fibers comprise at least one of polyacrylonitrile fibers, basalt fibers, asbestos fibers, and polypropylene fibers. In one embodiment, the solidifying agent comprises slag. In a specific embodiment, the solidifying agent comprises at least one of S75 grade furnace water quenched slag, S95 grade furnace water quenched slag, or S105 grade furnace water quenched slag. In a specific embodiment, the diluent comprises sulfonated tannin and/or sodium lignin sulfonate. In one embodiment, the base fluid comprises a first polymer, a second polymer, an inorganic suspending agent, a retarder, and water. In one embodiment, the first polymer is at least one of 2-acrylamide-2-methylpropanesulfonic