31results about How to "Reduce construction friction" patented technology

The invention discloses high temperature-resisting cleaning CO2 foam fracturing liquid suitable for unconventional oil and gas reservoir development. The high temperature-resisting cleaning CO2 foam fracturing liquid in gas phase is CO2; the high temperature-resisting cleaning CO2 foam fracturing liquid in liquid phase is high temperature-resisting cleaning fracturing liquid; the foam mass is 52 percent to 75 percent. The high temperature-resisting cleaning CO2 foam fracturing liquid is prepared from the following raw materials in percentage by weight: 0.3 to 0.65 percent of thickening agent, 0.2 to 0.5 percent of viscosity synergist, 0.2 to 0.3 percent of pH (Potential of Hydrogen) value modifier, 0 to 0.2 percent of high-temperature stabilizing agent, 0.01 to 0.1 percent of gel breaker and water, wherein the thickening agent is prepared from acrylamide, vinylpyrrolidone, maleic acid, anionic functional monomers, an initiating agent, inorganic salt and the like; the viscosity synergist is mainly prepared from an anionic surfactant; the pH value modifier is mainly prepared from an organic acid. According to the high temperature-resisting cleaning CO2 foam fracturing liquid disclosed by the invention, the temperature-resisting ability is up to 140 DEG C, the sand carrying performance is excellent, the frictional resistance is low, the foam stability is strong, the content of residual slag is extremely low, the stratum compatibility is good, back flowing is easy, the construction effect is quickly obtained, and important significances to effective development of an unconventional oil and gas reservoir and protection of a reservoir stratum are obtained.

The invention discloses a preparation method for biological glue for fracturing. The method is realized through the following steps: step 1: preparing a water phase from the following components in parts by weight: 40 to 88 parts of water, 2 to 10 parts of rosin-based polyoxyethylene sodium sulfosuccinate monoester and 10 to 50 parts of acrylamide; step 2: preparing an oil phase from the followingcomponents in parts by weight: 90 to 99 parts of white oil and 1 to 10 parts of Span 80; step 3: preparing emulsion from the following components in parts by weight: 30 to 60 parts of the water phaseprepared by the step 1 and 40 to 70 parts of the oil phase prepared by the step 2; under a stirring state, slowly adding the water phase into the oil phase; after adding the water phase, performing circular emulsifying for 1 to 3 times by utilizing a homogenization emulsifying pump; step 4: carrying out a polymerization reaction: adding the emulsion prepared by the step 3 into a reaction kettle with a stirrer; performing stirring and introducing nitrogen gas for 10 minutes or more; adding 0.005 to 0.1 part of an oxidant and raising the temperature to be 35 to 45 DEG C; then slowly dropwise adding 0.005 to 0.1 part of a reducing agent and completing the adding after 2 to 5 hours; and after completing the adding of the reducing agent, preserving heat at 35 to 45 DEG C for 1 hour, so as to prepare the biological glue.

A continuous pipe perforation fracturing method in a long borehole casing for underground gas drainage in a coal mine, comprising: step 1: in the coal mine, from a mudstone or sandstone roof at a certain distance from the top boundary of a broken and soft coal seam or from a hard rock of a broken and soft coal seam Construction of long boreholes for gas drainage in layered or hard coal seams with good coal structure; Step 2: Insert guide shoe and rigid casing; Step 3: Annular space between long borehole and rigid casing for gas drainage Carry out cement slurry plugging and solidification; Step 4: use coiled tubing to drag the packer to pack and segment, injectors to blast and perforate, and annulus between coiled tubing and casing to perform fracturing; Step 5: Start out of the fracturing tool, and the fracturing fluid is sprayed in a unified manner; the present invention can overcome the difficulty in forming holes in gas drainage drilling, uncertain location of fracturing crack initiation, short extension of fracturing cracks, poor fracturing reconstruction effect, and poor pumping efficiency. In order to solve the problems such as small and uneven mining influence range and short drainage duration, long drilling holes and multi-stage precise segmental fracturing for gas drainage are realized.

The invention relates to a crosslinking agent capable of crosslinking organic acid, and a preparation method and application thereof. The organic acid crosslinking agent is prepared from a titanium compound, isopropyl alcohol, ethylene glycol, amino acid and polyepoxysuccinic acid. The organic acid crosslinking agent is used for crosslinking of the organic acid in acidification and acid fracturingof an oil field, so the viscosity of an organic acid liquid system is increased; the temperature resistance of the acid liquid system is improved; the effective action distance of acid etching is longer; and the needs of deep-burial and high-temperature reservoirs are met.