6results about How to "Improve plugging success rate" patented technology

The invention discloses a water-swelling elastic plugging agent for a water-based drilling fluid and a preparation method of the water-swelling elastic plugging agent. The water-swelling elastic plugging agent comprises the following components in parts by weight: 100 parts of a polyolefin elastomer matrix material; 15 to 20 parts of a reinforced matrix material; 0.8 to 1.5 parts of a polyolefin elastomer matrix material cross-linking agent; 8 parts to 15 parts of a reinforcing agent A; 20 to 30 parts of a reinforcing agent B; 15 to 30 parts of super absorbent resin; 15 to 20 parts of a plasticizer; 0.2 to 0.8 part of an isolating agent; 0.5 to 1 part of an anti-aging agent; the plugging agent provided by the invention is simple in preparation process, not only is beneficial to industrial production, but also is convenient to prepare plugging slurry on site, can achieve a good plugging effect, and provides an effective technical means for well leakage treatment.

This invention discloses a self-expanding, temperature-resistant elastomer plugging agent for drilling fluids and its preparation method. The plugging agent is composed of the following components in parts by weight: 100 parts of temperature-resistant polyolefin elastomer matrix material, 5-20 parts of polymer composite modified water-absorbing reinforcing agent, 5-15 parts of carboxylated carbon nanotube-PEG water-absorbing reinforcing agent, 5-30 parts of reinforcing material, 10-30 parts of superabsorbent resin, and 0.5-1.5 parts of anti-hydrolysis agent. The plugging agent of this invention possesses excellent elasticity and a certain degree of toughness, allowing it to be squeezed into fractures under pressure. After absorbing water, its volume expands, yet it still maintains a certain degree of elasticity and strength. Under its own elasticity, it increases friction with the fracture surface, increasing the elasticity of the entire sealing layer, preventing the plugging material from flowing back or sliding deeper into the fracture, sealing the leakage channels, and achieving effective sealing of wellbore fractures.

This invention relates to a method for wellbore plugging using end-sand removal technology, specifically a method for wellbore plugging using end-sand removal technology, comprising the following steps: preparing a plugging agent, which includes granular plugging material, fibrous plugging material, and drilling fluid; and classifying them: classifying granular plugging material according to particle size; classifying fibrous plugging material according to fiber length; classifying drilling fluid according to the degree of change in dynamic and static shear forces; selecting granular plugging material, fibrous plugging material, and drilling fluid to obtain a plugging agent required for different types of wellbore leakage fractures; this invention avoids problems such as increased leakage fracture volume and increased plugging difficulty caused by the plugging material entering the leakage fracture and causing secondary fracture expansion during the plugging process, and has a high plugging success rate, short construction period, and low plugging material consumption.

This invention provides a solid-free plugging agent downhole delivery tool and a targeted plugging construction process. The delivery tool includes a plugging packer and a chemical dosing device connected to the lower end of the plugging packer. The chemical dosing device includes a lower connector, a chemical chamber connection connector, a chemical chamber, and a basket connected sequentially from top to bottom. The bottom of the basket has a release hole from which the chemical is released. This invention utilizes the delivery tool to extrude a solvent-free, single-component, nano-reinforced polyurethane grouting material into the wellbore in a single operation. After the polyurethane grouting material is injected into the leaking layer, under formation pressure, the polymerization rate is slow in the initial stage of the reaction. At this time, the grouting material remains in an oily liquid state and can follow the flowing water to target the leaking location where the pressure suddenly decreases. At this time, the polymerization reaction intensifies, rapidly foaming and encapsulating the surrounding rock mass or fault wall. Simultaneously, the generated carbon dioxide can also propel the grout deeper into the seepage channel, achieving targeted plugging.

The invention discloses a temperature-sensitive adhesive polymer applied to water-based and oil-based drilling fluids for improving formation pressure-bearing plugging, relates to the technical field of oil field drilling, and solves the problems of return-loss leakage, repeated leakage and poor plugging efficiency of the drilling fluids caused by insufficient pressure-bearing capacity of plugging materials in the existing method. The temperature-sensitive adhesive polymer for pressure-bearing plugging comprises the following components: bridging particles, mica, polyurethane foam, a functional adhesive material, branched epoxy resin, graphite and superfine calcium carbonate in a mass ratio of (30-35): (10-15): (1-2): (1-2): (2-4): (2-4): (40-45), the preparation method comprises the following steps: weighing the bridging particles, the mica, the polyurethane foam, the branched epoxy resin, the graphite, the superfine calcium carbonate and the functional adhesive material in proportion, mixing, and adding into soil slurry / drilling fluid; and uniformly stirring and mixing to prepare the temperature-sensitive adhesive polymer. The temperature-sensitive adhesive polymer and the plugging material are high in pressure bearing capacity, and the range of plugging cracks is wider.

The application belongs to the technical field of plugging in oil drilling, and particularly relates to a thixotropic agent and a strong retention and consolidation plugging method suitable for serious leakage. The thixotropic agent comprises 4-5 parts of organic polymer and 4-5 parts of inorganic substance by weight fraction; the organic polymer comprises 2-3 parts of bisphenol A glyceride monomer, 0.5-0.6 parts of acrylamide monomer, 2-3 parts of sulfonic acid monomer and 0.5-1 part of sodium hydroxide. The application realizes the application of the strong retention and consolidation plugging agent to serious leakage of large cracks and large solution cavities by optimizing the formula of the thixotropic agent and designing and optimizing the formula, preparation method and construction method of the plugging slurry prepared by using the thixotropic agent, so that the plugging slurry can be effectively retained in the leakage layer, the plugging effect is achieved, and the success rate of one-time plugging is improved.