6results about How to "Long gelling time" patented technology

This invention relates to a metal ion crosslinking stabilizer. It primarily addresses the problems of existing gel profile control agents, such as short gelation time, easy damage to medium and low permeability layers during injection, and inability to achieve deep reservoir sealing. Its components and proportions by mass percentage are as follows: 1%-2% retarder, 3%-5% reinforcing agent, 1%-3% regulator, 4%-5% ion stabilizer, 1%-2% water purifier, and the balance being water. Preparation method: 1) Add the ion stabilizer and reinforcing agent to water according to the proportions and mix evenly in a 45°C water bath; 2) Add the regulator to the mixture and mix evenly; 3) Add the retarder and maintain the water bath for 2-3 hours; 4) Add the water purifier to obtain the target product. This metal ion crosslinking stabilizer can be used as an auxiliary additive component in the formulation of polyacrylamide ion crosslinking profile control agent systems. It can prolong the gelation time of the profile control agent, ensure the gel viscosity of the profile control agent, improve the stability of the profile control agent, and achieve effective sealing of the system.

The invention relates to the technical field of fracturing fluid preparation, and in particular to a supramolecular fracturing fluid and a preparation method thereof. The hydrophobic association and electrostatic action between sodium salicylate and a surfactant in a crosslinking agent provided by the invention can form micellar gel, and a thickener can be embedded in the micellar gel through the association of hydrophobic groups to form a supramolecular network, thereby enhancing the network structure strength of the fracturing fluid, improving the rheological properties of the supramolecular fracturing fluid, and having a stronger sand suspension capacity. In addition, a solubilizing agent and a co-solvent reduce the decrease in water solubility caused by a large number of hydrophobic groups contained in the thickener, and sodium dodecylbenzene sulfonate can inhibit a crosslinking reaction to a certain extent through the shielding effect and steric hindrance effect of metal cations, prolonging the gelling time of the system, effectively solving the problem of large wellbore friction during ultra-deep fracturing, and effectively reducing shear damage, thereby having broad application prospects.

The invention relates to a metal ion crosslinking stabilizing and retarding agent. The problems that an existing gel profile control agent is short in gelling time, middle and low permeability layers are prone to being damaged in the injection process, and deep plugging of oil reservoirs cannot be achieved are mainly solved. The water purifying agent comprises the following components in percentage by mass: 1%-2% of a retardant, 3%-5% of a reinforcing agent, 1%-3% of a conditioning agent, 4%-5% of an ion stabilizer, 1%-2% of a water purifying agent and the balance of water. The preparation method comprises the following steps: 1) adding the ion stabilizer and the enhancer into water in proportion, and uniformly mixing in a water bath at 45 DEG C; (2) adding a regulator into the mixed solution, and uniformly mixing; the metal ion crosslinking stabilizing and retarding agent can be used as an auxiliary additive component for preparation of a polyacrylamide ion crosslinking profile control agent system, and can prolong the gelling time of the profile control agent, ensure the gelling viscosity of the profile control agent, improve the stability of the profile control agent and realize effective plugging of the system.

The application discloses a polymer gel deep profile control agent and a preparation method and application thereof. The polymer gel deep profile control agent comprises a gel-forming polymer, a crosslinking agent and water, wherein the gel-forming polymer contains a ketone carbonyl structural unit, and the crosslinking agent contains at least two active hydrogens; the gel-forming polymer further contains an acrylamide structural unit, an optional anion structural unit and an optional cation structural unit. The polymer gel deep profile control agent is simple to prepare, stable in performance, convenient to construct, long in gel-forming time, high in gel strength after gel-forming, can make the polymer gel enter a deep part of an oil reservoir, block a high-permeability layer and improve water injection development effect. In addition, the gel system does not contain heavy metal ions and is an environment-friendly water plugging and profile control agent.

The invention relates to the technical field of oilfield development, in particular to a gel channeling sealing agent capable of delaying gelling and a preparation method thereof.The preparation method comprises the following steps that acrylamide and sodium alginate are added into deionized water and stirred to be uniform, and a hydrogel precursor solution is obtained; adding the hydrogel precursor solution and Tween 80 into the initiator microcapsule, performing ultrasonic treatment, and adding a cross-linking agent and a calcium carbonate suspension to obtain the gel channeling sealing agent. According to the preparation method of the gel channeling sealing agent capable of delaying gelling, the initiator is released into the hydrogel precursor solution through the holes in the initiator microcapsules to obtain polyacrylamide gel, calcium ions generated after calcium carbonate is decomposed are chelated with sodium alginate to generate calcium alginate, and then the polyacrylamide gel is prepared into the gel channeling sealing agent capable of delaying gelling. And interpenetrating with a polyacrylamide gel system to form a double-network gel system.

The invention provides an inorganic gel blocking agent capable of delaying crosslinking and a preparation method and application thereof.The inorganic gel blocking agent is prepared from, by weight, 0.2-0.4 part of salt-resistant polymer, 0.5-2 parts of silicate and 0.1-0.4 part of complex, and the three materials are selected for matching, so that the crosslinking-delaying inorganic gel blocking agent is prepared. By means of the electrostatic repulsion effect of cations in the salt-resistant polymer and the complexation effect of the complex, the gelation time of the inorganic gel blocking agent is long, when the inorganic gel blocking agent is applied to blocking of deep high-permeability channel oil fields, injected water waves and the volume can be enlarged, the crude oil recovery rate in water flooding is effectively increased, and the inorganic gel blocking agent has important research significance.