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

Provided are a directional hydraulic injection tool string and a construction method for a coal-bed gas horizontal well. The directional hydraulic injection tool string is characterized by comprisinga guide cone, a screen pipe, a centering device one-way valve, a hydraulic anchor, a packer, an ejector, a hydraulic eccentric orientator, an upper centering device, a hydraulic releasing and an oil pipe which are sequentially connected, the hydraulic eccentric orientator is connected with the ejector through a fixed manner, the upper end of the hydraulic eccentric orientator and the lower end ofthe ejector are respectively through the upper centering device and the packer connected with an upper movable bearing and a lower movable bearing, and under the action of hydraulic, the eccentric orientator drives the ejector to achieve the function of directional ejection; the directional hydraulic injection tool string has reasonable design and complete functions, and higher reliability, stability and safety of the combined system, can achieve the function of outer pipe anti-channeling and fixed point fracturing, also achieve hydraulic sand blast perforation of large displacement, large hole, and orientation and subsection fracturing operation of large displacement and a large scale, is applied to the construction of coal-bed gas horizontal wells with complex conditions, such as cementing wells, uncementing wells and the like, and the directional hydraulic injection tool string has the advantages of high construction efficiency, low construction cost, a large scale of production increasing and improvement, high success rate of the construction and a good reconstruction effect and the like.

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.

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 provides a water-based clean fracturing fluid for fracturing. The fracturing fluid is formed by a small canonic antiswelling agent, organic sodium salt, a cationic surface active agent and water, wherein the concentration of the small canonic antiswelling agent is 0.4 percent by mass, the concentration of the organic sodium salt is 0.06 to 0.18 percent by mass, the concentration of the cationic surface active agent is 0.2 to 0.6 percent by mass, the mass ratio of the cationic surface active agent and the organic sodium salt is 1:0.3, the organic sodium salt is sodium salicylate, and the cationic surface active agent is any one or the mixture of 16-18 alkyl-3-methylammonium chloride. The invention can well solve the pollution problem of the fracturing fluid to the coal bed, simultaneously improve the sand-carrying performance of the fracturing fluid greatly, the price thereof is only 1.5 to 2.0 times of active water fracturing fluid and is far lower than that of guargum fracturing fluid and common clean fracturing fluid.

The invention relates to a coal mine underground gas extraction long drilled hole and coiled-tubing-in-casing perforation staged fracturing method. The method includes the steps that first, a gas extraction long drilled hole is constructed in a mudstone or sandstone roof with a certain distance to the top boundary of a broken soft coal seam or a hard layer of the broken soft coal seam or a hard coal seam with a good coal body structure; second, a guiding shoe and a rigid casing are lowered; third, cement paste blocking is carried out on annular space between the gas extraction long drilled hole and the rigid casing so as to solidify the hole; fourth, packing staging is carried out through a mode of dragging a packer by coiled tubing, an ejector carries out sand blasting perforation, and fracturing is carried out on the annulus between the coiled tubing and the casing; fifth, a fracturing tool is lifted out, and uniform blowout of fracturing fluid is carried out. The method can solve the problems that in existing gas extraction hole-drilling, hole forming is difficult, the crack initiation position of fracturing cracks is not determined, the fracturing cracks extend short, the fracturing modification effect is poor, the extraction affecting range is small and nonuniform, and extraction duration is short, and realizes gas extraction long drilled hole forming and multi-level precise staged fracturing.

The invention provides a multifunctional composite fracturing liquid system. The multifunctional composite fracturing liquid system comprises resistance reduction water and high-viscosity sand carrying liquid, wherein the resistance reduction water comprises 0.02 to 0.15 percent by weight of the resistance reduction agent; the high-viscosity sand carrying liquid comprises 0.2 to 0.75 percent by weight of a thickening agent; the resistance reduction agent and the thickening agent are identical aggregation polymer and are natural modified aggregation polymer and/or organic synthetic aggregation polymer. The low-concentration aggregation polymer having good resistance reduction performance and the high-concentration aggregation polymer having good sand carrying performance are used for forming the multifunctional composite fracturing liquid system; compared with the existing composite fracturing liquid system, the multifunctional composite fracturing liquid system has characteristics of fewer types of additives, simple formula and simple preparation process; meanwhile, the system has good resistance reduction performance, shear resistance and sand carrying performance; return liquid of the system can be reused after being treated in a way such as flocculating, precipitating and filtering, and the utilization rate of water for fracturing is increased.

The invention relates to a high-density fracturing fluid capable of slowing crosslinking and resisting high temperature. The fracturing fluid is composed of a stock solution and a crosslinking liquid with a volume ratio of 10 : 1, wherein the stock solution comprises, by weight percent, 0.5-0.65 % of hydroxypropyl guar gum, 8-45 % of a weighting agent A, 6-30 % of a weighting agent B, 0.5-2 % of a ZJ-07 cleanup additive, 0.01-0.04 % of a pH-value conditioning agent A, and the balance being water; the crosslinking liquid comprises, by weight percent, 0.5-3 % of a cross-linking agent YGB, 1-2 % of a cross-linking agent HT, 0.1-0.4 % of a pH-value conditioning agent B, 0-0.35 % of a gel breaker and the balance being water. The fracturing fluid is good in temperature-resistance and shearing-resistance performances, wherein the temperature-resistance performance is up to 145 DEG C, and a viscosity is still more than 120 Pa*S after the liquid is sheared for 90 minutes under 145 DEG C and 170 S<-1>.

The invention belongs to the technical field of oil field production increase, and specifically provides a slick water fracturing fluid for low temperature reservoir, wherein the components comprise,by mass, 0.15-0.25% of a thickener, 0.03-0.05% of a clay stabilizer, 0.20-0.30% of a structure stabilizer, 0.05-0.10% of a low temperature activator, 0.02-0.05% of a gel breaking agent, and the balance of water. According to the present invention, the slick water fracturing fluid for low temperature reservoir is developed, can meet the fracturing fluid system with characteristics of low viscosity,low friction, low cost, easy flowback, easy recovery and the like, and can rapid break the gel in the low temperature reservoir to reduce the damage on the stratum so as to well meet the reforming needs of low-permeability oil and gas field low-temperature reservoirs.

The invention belongs to the technical field of yield increase of an oil field, and concretely relates to slickwater fracturing fluid. The slickwater fracturing fluid has the following components by mass percentage: 0.15-0.45% of a thickening agent, 0.03-0.05% of a clay stabilizing agent, 0.30-0.50% of a structural stabilizing agent, 0.04-0.08% of a gel breaker, 0.01-0.05% of a degraded catalyst,and the balance is water, wherein the sum of the mass percentage of the components is 100%. The purpose of the invention is exploitation of a novel slickwater fracturing fluid system which has the characteristics of low viscosity, low frictional resistance, low cost, easy flowback, and easy recovery, the slickwater fracturing fluid satisfies the novel development requirement of volume fracturing,is reusable, and alleviates the on-site environmental protection pressure.

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 discloses a fracturing method for improving a laying effect of a heterogeneous reservoir proppant, and relates to the technical field of oil and gas field sand fracturing processes. According to the method, geological data of a target well are collected and evaluated; according to the target well reservoir permeability and the single artificial fracture control radius, the segment length, the cluster spacing and the cluster number are designed; the artificial fracture length, the flow conductivity, the fracturing fluid scale and the fracturing proppant scale are designed on the basis of achieving the optimal yield; testing fracturing is conducted on the target well, and the reservoir fracturing fluid efficiency of the target well is determined; the usage amounts of prepad fluid, prepad sand-carrying fluid and sand-carrying fluid are calculated according to the determined fracturing fluid scale and the determined fracturing fluid efficiency correspondingly; the use amountof displacing fluid is determined according to the volume of a target well shaft; and a pump injection program is generated according to the determined proppant scale as well as the determined amountsof the prepad fluid, the prepad sand-carrying fluid, the sand-carrying fluid and the displacing fluid, and fracturing operation is implemented. The method solves the technical problem that unsupported and invalid seams are formed in the fracturing process due to the fact that the proportion of the prepad fluid cannot be completely matched with a reservoir stratum in traditional fracturing design.

The invention provides a base solution composition of a chemical rubber plug, a chemical rubber plug composition, a chemical rubber plug and an application process of the chemical rubber plug. The base solution composition for the chemical rubber plug is prepared from the following components in parts by weight: 0.005-0.08 part of a delayed cross-linking agent, 0.5-1.2 parts of a thickening agent and 98-99 parts of water. According to the base solution composition for the chemical rubber plug, due to the fact that the delayed cross-linking agent is added, the cross-linking time of the high-viscosity rubber plug is prolonged, the plugging effect is improved, the construction friction resistance is reduced, and meanwhile the problem that the high-temperature shear viscosity of the chemical rubber plug is rapidly reduced is solved; and therefore, the purpose of efficiently controlling the height and morphological development of the fractured artificial fracture is achieved. The base solution composition for the chemical rubber plug is simple in formula, the raw materials are cheap and easy to obtain, and the production cost is reduced to a certain extent.