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

The present invention relates to a multifunctional drag-reducing water system for continental shale gas fracturing and a preparation method thereof. The components and mass percentages of the multifunctional drag-reducing water system for continental shale gas fracturing are as follows: Drag reducer 0.02-0.05%, inhibitor 0.5-1%, anti-scaling agent 0.1-0.3%, synergist 0.001-0.003%, regulator 0.2-0.5%, and the balance is water. The multi-functional drag-reducing water system provided by the present invention has the characteristics of high drag-reducing rate, strong suppression, reduced imbibition, and reduced adsorption. , chemical reaction, promote the rapid flowback of fracturing fluid, reduce the adsorption damage of fracturing fluid, meet the requirements of continental shale gas fracturing construction, reduce the damage of drag-reducing water fracturing fluid to reservoirs, and realize continental shale Efficient development of gas.

The invention discloses a boron cross-linking agent and a boron crosslinking fracturing fluid used for high temperature deep well. The boron cross-linking agent is a boron-based multi-element chelate, which takes a boron-containing compound and a chelating agent as main materials and water as a solvent for reacting under certain pH value and temperature. The boron crosslinking fracturing fluid comprises the following components by mass percentage: 0.02-0.04% of boron cross-linking agent, 0.3-0.6% of thickening agent hydroxypropyl guanidine gum, 0.02-0.03% of bactericide dodecyl dimethyl benzyl chloride, 1-2% of clay stabilizing agent potassium chloride, 0.02-0.03% of high temperature stabilizing agent stabilizing agent sodium hyposulfite, 0.04-0.05% of fluorocarbon surfactant, 0.02-0.03% of PH conditioning agent sodium hydroxide and balance of water. The boron cross-linking agent can effectively control the crosslinking speed, the boron crosslinking fracturing fluid has good high temperature resistance and high shear performance, and has the advantages of low frictional resistance, easy flowback and wide market prospect.

The present invention disclosed a fracture method for improving the effects of non -average reservoirs supporting agent, involving the field of oil and gas fields and sand fracturing technology.Collect and evaluate the geological data of the target well; design section length, cluster spacing and clusters according to the target well reservoir penetration and single artificial crack control radius;The scale and support agent scale of the liquid; carry out test fracture to the target well to determine the efficiency of the fracture fluid of the target well reservoir; calculate the front liquid, the front sand and the front sand and the fracture fluid efficiency according to the determined fracture liquid size, the fracture fluid efficiencyUse the amount of sand liquid; determine the amount of the top alternative liquid according to the volume of the target well; according to the determined support agent scale and the front solution, the sandwiches, the sandwiches and the top alternative liquid, generateOperation.The present invention solves the technical problem that has no support and invalid seam due to the inability to fully match the proportion of the front liquid and the reservoir in the traditional fracture design.

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.

The invention provides a multifunctional composite fracturing fluid system, which includes drag-reducing water and high-viscosity sand-carrying fluid; in mass percentage, the drag-reducing water includes 0.02% to 0.15% of drag-reducing agent; in mass percentage , the high-viscosity sand-carrying fluid includes 0.2% to 0.75% thickener; the drag reducer and the thickener are the same associative polymer, which is a natural modified associative polymer and / or organic synthesis associative polymers. In the present invention, a multifunctional composite fracturing fluid system is formed by using the low-concentration associative polymer with better drag reduction performance and the high-concentration associative polymer with better sand-carrying performance, which is comparable to the existing composite fracturing fluid system. It has the characteristics of fewer types of additives, simple formula, and simple preparation process. At the same time, the system has better drag reduction, shear resistance, and sand-carrying properties; Reuse to improve the utilization rate of fracturing water.

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.