17results about How to "Improve fracturing effect" patented technology

The invention provides a biodegradable ammonium persulfate coating gel breaker for fracturing operation and a preparation method of the biodegradable ammonium persulfate coating gel breaker. The preparation method comprises the following steps: determining a mass ratio R of rosin glyceride to ethyl cellulose according to a target reservoir temperature T, and calculating a coating weight gain ratio coefficient K and the total mass of a coating material according to target delayed gel breaking time t; preparing a core material ammonium persulfate into a water phase, and emulsifying in an oil phase to form a reversed-phase microemulsion; a gradient interface deposition method is adopted, a coating solution A prepared from rosin glyceride and part of ethyl cellulose and a coating solution B prepared from the remaining ethyl cellulose are dropwise added in sequence, and a coating material is sequentially deposited on a core material liquid drop interface through pressure reduction to form a compact bottom layer and a slow-release main body layer; according to the invention, the coating layer is biodegradable, chlorine-free and corrosion-free, through the cooperation of the material ratio and the process, the accurate and controllable delay of the gel breaking time at high temperature is realized, the reservoir is effectively protected, and the fracturing effect is improved.

This invention relates to a zero-residue multi-stage deflagration fracturing method and system, addressing the problems of existing deflagration fracturing devices, such as well-water pollution, failure to achieve the expected fracturing effect, and low efficiency. The multi-stage deflagration fracturing method includes: Step 1: Preparing the deflagration fracturing charge, central tube, and guide plug in the deflagration fracturing system using a combustible material that is soluble in chloride ions; Step 2: During operation of the deflagration fracturing system, a detonator ignites the central tube and the deflagration fracturing charge; Step 3: The central tube burns, the deflagration fracturing charge deflagrates, and the guide plug burns simultaneously, thus performing multi-stage deflagration fracturing; Step 4: After deflagration fracturing is completed, the residue from the central tube, deflagration fracturing charge, and guide plug falls into the well water, where it dissolves completely, achieving zero residue. To achieve the above method, this invention also proposes two zero-residue multi-stage deflagration fracturing systems.

The invention belongs to the technical field of coal mine drilling tool equipment, and particularly provides a drilling, fracturing and hole protecting integrated drill bit which comprises a connecting rod section and a drill bit section, one end of the connecting rod section is connected with an external drill rod, the drill bit section is assembled at the other end of the connecting rod section, the drill bit section is divided into an inner layer and an outer layer, and a gap is reserved between the inner layer and the outer layer. An annular screen pipe moving power valve is arranged in the gap, a water outlet is formed in the end face of the drill bit section, and an inner sleeve is arranged in the connecting rod section. Drilling, fracturing and hole protection are integrated, after drilling construction is completed, in-hole real-time machining, hole protection screen pipe lowering and fixed-point multi-load fracturing are carried out from the bottom of a hole to the outside of the hole, the problem of hole collapse caused by drill withdrawal is solved, the protection pipe lowering rate is increased, the drilling fracturing precision is improved, the fracturing effect is enhanced, and the drilling gas extraction effect is greatly improved.

The invention belongs to the technical field of oil and gas field development reservoir transformation, and discloses a tracer agent for multilayer fracturing flowback monitoring, a preparation method and application, according to the preparation method, the effectiveness of the tracer agent is evaluated through an experimental means, and it is guaranteed that the effective tracer agent can be used for monitoring a flowback curve of fracturing fluid flowback volume along with time; according to the application method, a tracer agent is used for marking fracturing fluid, and the initial fracturing fluid dosage and the initial tracer agent dosage are recorded; after flowback is started, accumulated flowback volume is recorded at a fixed time interval, the real-time concentration of the tracer agent is measured, and the flowback volume of each section is calculated; according to the return volume of each section and the accumulated return volume of each section, the return curve and the accumulated return rate of each section are calculated, the liquid production contribution rate and the production sequence of each layer section can be accurately obtained, and the liquid production capacity can be calculated in a semi-quantitative mode. Through flow-back liquid sample detection and data analysis, the liquid drainage sequence, the flow-back contribution rate and the like of each layer section can be determined, and data support is provided for subsequent construction.

The invention belongs to the technical field of oil exploitation, and particularly relates to a dry powder thickening agent for fracturing as well as a preparation method and application thereof. The thickening agent comprises the following components: (a) 1-vinyl-2-pyrrolidone; (b) a di [2-(methacryloyloxy) ethyl] phosphate ester; (c) 2-(perfluorohexyl) ethyl methacrylate; (d) 4, 4 '-diaminostilbene-2, 2'-disulfonic acid; (e) an initiator; based on 1 mole part of 1-vinyl-2-pyrrolidone, the dosages of the di [2-(methacryloyloxy) ethyl] phosphate ester, the 2-(perfluorohexyl) ethyl methacrylate and the 4, 4 '-diaminostilbene-2, 2'-disulfonic acid are 0.05 to 0.1 mole part, 0.1 to 1 mole part and 0.2 to 0.5 mole part respectively, and the dosages of the di [2-(methacryloyloxy) ethyl] phosphate ester, the 2-(perfluorohexyl) ethyl methacrylate and the 4, 4 '-diaminostilbene-2, 2'-disulfonic acid are respectively 0.05 to 0.1 mole part, 0.1 to 1 mole part and 0.2 to 0.5 mole part. The thickening agent has the advantages of high apparent viscosity, high shear resistance, temperature resistance and high resistance reduction rate, and the resistance reduction rate reaches 70% or above.

A method for strengthening methane in-situ combustion fracturing, liquid carbon dioxide is pressurized and heated to form supercritical carbon dioxide, which is then sent into the fracturing channel to form a complex fracture network around the fracturing channel; mixed fracturing fluid formed by mixing supercritical carbon dioxide and fly ash is injected into the well bottom; combustion-supporting agent is injected into the wellbore and mixed with the mixed fracturing fluid at the well bottom to enter the complex fracture network together, so that a multiphase mixed fluid is formed in the complex fracture network; the annulus valve is closed to promote mineralization reaction of supercritical carbon dioxide and fly ash under the temperature and pressure conditions of the reservoir, and to form high-strength minerals; the mineralization reaction is used to promote the desorption of methane in the reservoir and into the complex fracture network, so that methane-combustion-supporting agent mixed gas is formed in the complex fracture network; the combustion process is used to promote the dust cloud formed by the mixing of fly ash and gas in the complex fracture network, to strengthen the effect of methane in-situ combustion; and the fracturing reconstruction of all layers is completed. The fracturing effect of the method is ideal.

The application discloses a device for strengthening fracturing of a ground drilling well and a method for determining fracturing conditions, which comprises the following steps: firstly, after the ground drilling well passes through a coal seam, a bottom space of the drilling well is formed by continuous construction, and an air bag is arranged in the bottom space of the drilling well, which is used for avoiding that acid and alkali liquid enters the bottom space of the drilling well when fracturing, and after the fracturing is completed, the acid and alkali liquid is discharged into a lower rock layer under the bottom space of the drilling well; secondly, acid liquid and alkali liquid are alternately injected into the ground drilling well to perform fracturing impact; thirdly, the functions of dissolving and dissolving and corroding cementing material, mineral and blockage in the coal body by the acid liquid and the alkali liquid are used to improve fracturing effect; and fourthly, after the acid liquid is fractured, a positioning support ball is carried into a crack to perform support, and the positioning support ball can delay the closure of the crack and can move when the alkali liquid is fractured. After the fracturing is completed, the positioning support ball is distributed in the crack, the positions of the positioning support balls in the coal seam can be obtained by using a positioner detector, and then the development and cracking conditions of the crack after the fracturing can be obtained, so that the arrangement position of the next ground drilling well can be determined.

The invention relates to the technical field of oil and gas field exploration and development equipment, and discloses a single-gun-body in-situ rotary bullet-changing in-situ different-item perforator and an operation method thereof.The perforator comprises a shell, an annular cavity is formed in the shell, multiple pairs of through holes are oppositely formed in the two side walls of the annular cavity, and each pair of through holes are longitudinally formed; the two bullet supply parts are oppositely arranged on the shell, the rotary driving part is connected with the two bullet supply parts, and each bullet supply part is provided with a plurality of bullet storage bins corresponding to the second through holes, perforating bullets arranged in the bullet storage bins and a push-out part; the plurality of piezoelectric micro-valve modules are respectively arranged at the opposite through holes in the annular cavity and are used for controlling the opening degree of the valve; the control system is in signal connection with the rotary driving part, the plurality of push-out parts and the plurality of piezoelectric micro-valve modules; the perforator is simple in design and free of downhole fallen objects, double dynamic adjustment of variable energy and secondary phase can be achieved through a single tubular column, and the perforation efficiency and the reservoir transformation effect are remarkably improved.

This invention discloses a sterically hindered hydrophilic nano-silica, its preparation method, and its applications, belonging to the field of shale oil and gas storage modification and production enhancement technology. The sterically hindered hydrophilic nano-silica is modified with ethylene oxide and aniline. The nano-silica has a particle size of 2-5 nm, the mass percentage of ethylene oxide to nano-silica is 1.5-3:1, and the mass percentage of aniline to nano-silica is 0.8-3:1. The prepared hydrophilic nano-silica can be used in the preparation of reagents to reduce fracturing fluid damage. This hydrophilic nano-silica competes with polymers for adsorption, reducing polymer adsorption blockage and thus reducing fracture damage.

A method and system for optimizing the design and fracturing scheme of shale gas horizontal wells, belonging to the field of oil and gas field development, includes: multi-source data collection and preprocessing; multi-source data fusion to generate a high-precision three-dimensional geological model; establishing reservoir attribute models and natural fracture models respectively, and predicting the activity of natural fractures; evaluation of geological engineering parameters, evaluation of vertical and horizontal sweet spots, and well location deployment; drilling / fracturing geological design; fracturing site tracking and post-fracturing production effect evaluation; using numerical simulation technology to predict the degree of shale gas horizontal well stimulation and gas well productivity, and continuously adjusting and optimizing the shale gas horizontal well design and fracturing optimization scheme based on the prediction results and feedback from actual production data. This invention has the advantages of high accuracy and reliability in reservoir evaluation, while reducing construction risks and improving development results; it also improves the productivity and economic benefits of shale gas horizontal wells.

The application discloses a shale oil horizontal well microseismic fracture parameter interpretation prediction method, and steps are as follows: step (1), microseismic fracture parameter interpretation prediction data preparation, determining the principle of parameter screening, and collecting the data of the screened parameters; step (2), data preprocessing; step (3), fracture parameter influence factor screening; step (4), regression prediction model construction; step (5), regression prediction model verification and evaluation; and step (6), application of the regression prediction model. The application has the following beneficial effects: 1. two modeling methods are used to establish a shale oil fracturing fracture parameter prediction model, and quantitative prediction of microseismic fracture parameters is realized; 2. high accuracy; 3. as a basis for shale oil horizontal well design, the application can optimize construction scale and design parameters, and also can provide a diagnosis method for fracturing construction, timely adjustment of construction parameters and improvement of fracturing reconstruction effect.

This invention relates to the field of oil and gas field fracturing technology, and discloses a supramolecular fracturing fluid system and application method with both percolation and oil displacement capabilities. Its components include 0.3%-0.8% by mass of a supramolecular hydrophobic associating polymer, 0.2%-0.5% of a nano-microcapsule oil displacement agent, 0.05%-0.1% of a pH adjuster, and 0.1%-0.3% of a co-solvent, with the balance being a base fluid. The supramolecular hydrophobic associating polymer forms a dynamic three-dimensional network through self-assembly of hydrophobic side chains. The nano-microcapsule oil displacement agent uses a biodegradable polymer as a wall material to embed surfactants, achieving controlled release triggered by the reservoir environment. This system requires no crosslinking agent, has low residue content to reduce reservoir damage, and combines low friction with strong proppant carrying capacity. The controlled release of the nano-microcapsule improves the utilization rate of the oil displacement agent, realizing integrated fracturing and percolation oil displacement, and is suitable for the fracturing needs of various low-permeability to tight reservoirs.

The present application relates to the technical field of hydraulic fracturing method, and is an alternating pulse injection method for promoting proppant grouping, which comprises uniformly stirring A agent with proppant and injecting into the formation, and B agent is a slow-release promoter which is injected into the formation together with fracturing fluid in the preflush and mid-top fluid stage. The alternating pulse injection method for promoting proppant grouping can improve single well production by 20% to 90%, eliminates the loss of flow conductivity caused by residue blockage and proppant embedding, thereby reducing the pressure drop funnel effect near the wellbore and improving the fracturing reconstruction effect; and a centimeter-level high-flow channel is established, which greatly improves the flowback rate and flowback speed and reduces the risk of sand plugging during construction.

The application discloses a method for preventing fracturing proppant backflow by generating porous artificial well wall around well, and belongs to the technical field of oil and gas well fracturing reconstruction. According to formation pressure, formation temperature and formation permeability, the improved double-effect slurry is prepared, so that the viscosity, solidification time and pore structure after solidification of the improved double-effect slurry meet the injection requirements of the production well; the improved double-effect slurry is displaced into the fracturing fracture by injecting the isolation fluid and gradually displacing the fracturing proppant; the improved double-effect slurry forms high-strength porous consolidated body in the fracture around the well after well shut-in, the synergistic optimization of the proppant backflow inhibition and the flow conductivity is realized, the serious flow conductivity attenuation caused by the proppant backflow near the production well is avoided, the production effect is influenced, the output of formation sand and gravel and coal powder can be reduced, the proppant backflow can be effectively prevented, the fracturing effect can be remarkably improved, and the adverse effects caused by the sand production and the proppant backflow can be eliminated.

This invention discloses a composite temporary plugging agent suitable for different temperature gradients and its preparation method, belonging to the field of oil and gas field development technology. The composite temporary plugging agent comprises the following components by mass parts: silica sand: 2-4 parts; glass microspheres: 8-10 parts; alkaline solution: 1-3 parts; silane coupling agent: 4-6 parts; organic solvent: 80-90 parts; polymer monomer one: 4-10 parts; crosslinking agent one: 0.2-1.2 parts; polymer monomer two: 17-24 parts; comonomer: 4-5 parts; crosslinking agent two: 0.06-0.3 parts; initiator: 0.06-0.12 parts; modified nano-blended material: 0 parts or 3-6 parts; dispersant: 0.3-0.6 parts; viscous modifying liquid: 20-25 parts; wherein, the viscous modifying liquid comprises tetraethyl orthosilicate: 3-7 parts; dimethyl silicone oil: 3-7 parts. This invention effectively improves the fracturing effect of deep unconventional reservoirs, overcomes the shortcomings of existing temporary plugging agents in terms of insufficient performance and difficulty in synergizing key performances under high temperature and high pressure environments, and realizes their reliable application in reservoirs with different temperature gradients.

The invention discloses a shale oil highly-deviated well stress and rock mechanics calculation method and system. According to the method, a conventional logging data set along a shaft is obtained, the conventional logging data set generally comprises data columns such as interval transit time data, resistivity, density data, natural gamma data and neutron porosity data, and the data columns are selected according to corresponding characteristics of regional logging; selecting the same reservoir, and establishing a relationship between natural gamma data and sound wave data; selecting the same reservoir, and establishing a relationship between neutron porosity data and sound wave data; and through the GRAC and the CNLAC obtained in the step 3d, mechanical parameters of a certain depth are obtained through an indoor rock mechanical test, and a weight coefficient is obtained. Through the field test fracturing test, the actually measured minimum horizontal principal stress at the perforation can be obtained, and the weight coefficient can be obtained. Therefore, an alternative formula verified by measured data is obtained, the stress and mechanical parameter profile of the deep fractured highly-deviated well can be obtained more reliably, and the pertinence of fracturing design is improved.

This utility model relates to a material feeding device in fracturing operations, including a base and a fixed column. A movable column is slidably inserted into the fixed column, and a rack is embedded in the movable column. An L-shaped plate is formed on the front of the fixed column, and a gear is slidably inserted into the L-shaped plate. The gear is connected to a motor and meshes with the rack. A fixed plate is fixed to the top of the movable column, and a connecting column is fixed to the top of the fixed plate. A placement plate is fixed to the top of the connecting column, and a feeding plate is hinged to one side of the placement plate. Sliding grooves are formed on both sides of the connecting column, and an L-shaped column is slidably inserted into the grooves. The L-shaped column is located above the fixed plate. An electric push rod is installed on the back of the L-shaped column, and a connecting block is hinged to one side of the L-shaped column. The end of the connecting block away from the L-shaped column is fixedly connected to one end of the placement plate. This utility model allows for adjustment of the operating height and facilitates adjustment of the feeding angle, thereby ensuring uniform dispersion of materials in fracturing fluid.