33results about How to "Rapid flowback" patented technology

The present invention provides a high-efficiency self-generated gas foam fracturing fluid and a construction method. The foam fracturing fluid is composed of a base fluid, a gas-generating fluid and a heat-generating agent, wherein the mass ratio of the base fluid, gas-generating fluid, and heat-generating agent is 100: (30‑42): (5‑9). During construction, the base fluid and the gas-producing fluid are pumped downhole together through the suction of the sand mixing truck according to the mass ratio, and the heat generating agent is pumped into the downhole along with the proppant. The invention does not need liquid nitrogen accompanying injection, simplifies the on-site process and reduces the construction cost, and a large amount of gas generated through the chemical reaction achieves the purpose of increasing the energy of the formation, improving the flow capacity of the reservoir liquid, and increasing the output. It can quickly generate a large amount of inert and safe gas, and will not produce toxic gas of nitrogen oxides, reducing construction risks. At the same time, the alkaline environment generated by the reaction product is conducive to the formation of fracturing fluid gel and the corrosion protection of downhole pipe strings. By generating foam, the Jiamin effect is used to increase the net pressure of the formation, which can quickly flow back, generate heat in the deep formation to promote gel breaking, and reduce the damage of fracturing fluid to the reservoir.

The invention discloses a formula of a low-pressure gas field old well re-production unlocking treatment agent and a preparation method thereof, which, in terms of weight percentage, are composed of the following components: 0.1-0.4% of a surface treatment agent, 0.05-0.3% of a nanomaterial %, dispersant 3-8%, cleaning agent 10-18%, mutual solvent 18-32%, wetting reversal agent 2-12%, industrial tap water to make up the balance. The liquid unlocking treatment agent of the invention can reduce the liquid surface tension and the oil-water interfacial tension in the near-wellbore zone, reduce the capillary resistance of the liquid, increase the contact angle between the liquid and the rock, and change the wettability of the rock surface. , prolong the effective period of rock surface treatment.

The invention discloses a method of fracturing a coal-bed gas reservoir and belongs to the field of coal-bed gas exploitation. The method comprises following steps: after perforation in a middle-upper part of the coal bed and a coal bed top board above the coal bed, active water fracturing fluid is pumped and injected in the coal bed top board to form a first crack; low sand ratio sand-carrying fluid and high sand ratio sand-carrying fluid are successively pumped and injected into the first crack, and a second crack communicated with the first crack is formed in the coal bed, and the extension of the second crack is promoted to form multiple branchlike cracks containing sand support agent. The low sand ratio sand-carrying fluid comprises following components by percentage of mass: 0.1-0.3% carboxymethyl hydroxypropyl guanidine gum, 1-2% KCl, 0.5-1% discharge aiding agent, 8-12% sand support agent, and water as balance; the high sand ratio sand-carrying fluid comprises following components by percentage of mass: 0.1-0.3% carboxymethyl hydroxypropyl guanidine gum, 1-2% KCl, 0.5-1% discharge aiding agent, 12-48% sand support agent, and water as balance. The method provided by the invention can form a long distance supporting seam network in the coal-bed gas reservoir, and effectively improve the yield of the coal-bed gas reservoir.

The invention discloses a polymer perforating fluid and a preparation method thereof. The polymer perforating fluid comprises, by mass, 0.25 to 0.45% of a polymer densifier, 12 to 26% of a weighting agent, 0.02 to 0.08% of a cleanup additive, 0.015 to 0.03% of a gel breaker and 0.55 to 2.5% of a temporary plugging agent, with the balance being water. The polymer perforating fluid provided by the invention has a density adjustable in a range of 1.10 to 1.25 g / cm<3> and has a viscosity of 50 mPa.s or above after shearing for 60 min under the conditions of a temperature of 50 to 100 DEG C and a rotating speed of 1000 / s; a gel-broken fluid has a viscosity of no more than 2 mPa.s and low interfacial tension and can rapidly flow back after construction; and the polymer perforating fluid is especially applicable to high-porosity high-permeability alkali-sensitive strata with abnormally high pressure and has the characteristics of adjustable density, leak-proof and leak-stopping performance, resistance to temperature and shearing, low fluid loss, low corrosion rate, low damage to rock cores, thorough gel breaking and easiness in flowback.

Disclosed is a method for solving water block effect, the method comprising: adding functional powder to pores producing water block to eliminate the water block, the functional powder being amphiphilic powder, or mixed powder consisting of ultra-hydrophilic powder and hydrophobic powder, the particle density of the functional powder being greater than 1 g / cm3, and the average particle diameter of the functional powder being less than 100 microns. The method of the present invention is simple, easy, of low cost, and has wide sources of raw material. During the use of the method, the functional powder reduces liquid-phase interfacial tension, and has good durability for inhibiting water block damage because the functional powder is small solid particles easily held in tiny holes or cracks on rock surfaces. In addition, compared with an acidifying method, the present invention greatly improves the inverted discharge effect, better solving the water block effect, thus greatly improving the productivity of an oil well.

The invention relates to the technical field of shale gas exploitation, in particular to a liquid CO2 fracturing technology for a shale gas well. When the liquid CO2 fracturing technology is constructed, a fracturing pump truck, a sealed fracturing blender truck, a CO2 boosting pump truck, a measuring truck, a fracturing pipeline truck, a CO2 tank vehicle and a CO2 storage tank need to be arranged; the fracturing pipeline truck is provided with a pressure manifold and a high pressure manifold; and the measuring truck is provided with a monitoring instrument. The liquid CO2 fracturing technology is characterized in that the liquid CO2 fracturing technology is executed according to six steps of placing fracturing equipment and construction vehicles, testing the pressure, processing pre-acid, constructing liquid CO2 fracturing, closing the well after carrying out fracturing and opening the well for gushing and carrying out flowback after carrying out fracturing. The liquid CO2 fracturing technology for the shale gas well implements high flowback speed and short operation period and basically has harmlessness to a shale gas reservoir stratum.