87results about How to "Reduced fracturing costs" patented technology

The invention relates to an abrasive jetting device and a method for abrasive water jet perforation and multiple fracturing; wherein the abrasive jetting device has multistage jet guns which are connected in series; the jet guns are all hollow columns; the side walls thereof are respectively provided with at least two nozzles; the lower part of each stage of jet gun is provided with a packer; the side wall of the packer is provided with a sealing sleeve which can expand outward under the action of high-pressure liquid; the jet guns comprise a first stage bottom jet gun arranged at the lower part of the abrasive jetting device and multistage upper jet guns arranged above the bottom jet gun; wherein all the upper jet guns are respectively provided with a sliding sleeve which can seal the nozzle of the stage of jet gun and sealing sleeve; and the sliding sleeve can slide to the lower part of the sealing sleeve under the action of external force so as to open the nozzle and the sealing sleeve. The invention can be used for casing straight wells or horizontal wells, solves the problem of layered or staged fracturing in the straight wells or the horizontal wells in oil fields, and achieves the purposes of saving fracturing cost, improving fracturing effect and reducing the construction risk.

Methods of processing a fluid recovered from an oil or gas extraction operation for reuse in a hydraulic fracturing fluid are described. The methods include providing an amount of a produced fluid composition containing iron and suspended solids and controlling at least one of the conductivity, iron content, oxidative strength, and pH of the composition, such that Fenton's reagent is formed in situ. Also described are hydraulic fracturing fluids produced using fluid recovered from an oil or gas production process and treated in accordance with the methods described herein as well as systems for preparing a hydraulic fracturing fluid having, as a fluid source, fluid recovered from an oil or gas production process that has been treated in accordance with the methods described herein.

The invention belongs to the technical field of yield increasing and fracturing of petroleum engineering and provides a method for preparing a self-suspension propping agent in a laboratory. The method comprises the following steps: taking quartz sand/ceramsite/propping agent as aggregates; pre-treating with an organic solvent and treating the surface with a coupling reagent; polymerizing and coating; and crushing, drying, pelletizing and then packaging. A coating polymerizing product (as shown in the figure) is acquired through the polybasic polymerization of the reactant and acrylamide/sodium acrylate/functional monomer/cross-linking agent. The expansion times of the prepared self-suspension propping agent is 3-12 times; the self-suspension propping agent can be completely hydrated within 1min-2min; the hydrated layer is stably expanded at 2 DEG C to 193 DEG C; the self-suspension propping agent swells once encountering with water, the volume density is reduced from 2.4g/cm3 to 1.3g/cm3 and the excellent self-suspension characteristic after the clean water system swelling is presented. The self-suspension propping agent prepared in the laboratory can realize the onsite mixing for hydraulic fracturing construction, the water for fracturing is greatly reduced, the labor cost is lowered and the application prospect is wide.

The invention relates to a fracturing technology for implementing the ultrahigh flow conductivity, which comprises the following steps: 1, judging whether geomechanics parameters of a target reservoir is suitable for the fracturing technology disclosed by the invention or not; 2, judging whether completion perforation of a target well is suitable for the fracturing technology disclosed by the invention or not, and if no, changing a perforating scheme of a well bottom; 3, before fracturing, selecting related fracturing materials; 4, carrying out fracturing on the target well by using a unique pumping program of the fracturing technology disclosed by the invention. According to the fracturing technology, proppant struts are formed in a stratum; flow conductivity of a stratum fracture is not improved by a filling layer of a proppant, but oil gas passes through by passages between the proppant struts; the flow conductivity is obviously improved by the open flowing passages; the flow conductivity of an existing conventional fracturing technology is not more than 200mum<2>*cm generally, but the flow conductivity of the fracturing technology for implementing the ultrahigh flow conductivity, which is disclosed by the invention, is higher than that of the conventional fracturing technology by 1 to 3 orders of magnitude; the fracturing technology reduces a pressure drop in the fracture, is helpful for improving drainage capacity and increases the effective fracture half-length and the production increase volume of the reservoir so as to improve yield.

The invention relates to a coal bed methane hydrofracture method. Active water fracturing fluid is used as prepad fluid and displacing fluid, carboxymethyl guanidine gum fracturing fluid is used as sand-carrying fluid, four kinds of quartz sand different in particle size range are used as propping agents, the 100-mesh-to-70-mesh mealy sand and the 70-mesh-to-40-mesh fine sand serve as the propping agents in the prepad fluid, the 40-mesh-to-20-mesh medium sand and the 20-mesh-to-14-mesh coarse sand serve as the propping agents in the sand-carrying fluid, and the proportions of the added sand which is different in particle size and serves as the propping agents are different. The concentrations of clay stabilizers KCL in the active water fracturing fluid and the carboxymethyl guanidine gum fracturing fluid are determined according to the GR average value, represented with the API unit, of fractured objective layer section logging data. By means of the coal bed methane hydrofracture method, the coal bed methane production increasing effect is improved to a great extent, and the preparing cost of the fracturing fluid is reduced to the maximum degree while swelling is effectively prevented.

The invention relates to an abrasive material jet injection device which is provided with a spray gun for injecting abrasive material jet, wherein the spray gun is provided with at least two nozzles, and the spray gun is connected with an oil tube. The abrasive material jet injection device has simple structure and is easy to assemble and maintain. The key part (nozzle) in the device has longer service life so as to satisfy the requirements of two operations of perforating and fracturing. Because a check valve and a sieve tube are arranged, the phenomenon that the nozzle of the injection device is subjected to sand jamming can be greatly lowered; meanwhile, when the device is subjected to sand jamming faults, base fluid is pumped into the annulus of an annular tube, the base fluid enters the injection device via the check valve by the sieve tube, which is convenient to flush the device, and therefore the well can be subjected to backflushing to ensure that the operation is successfully carried out. Because a packer is omitted, construction equipment is simplified. According to the abrasive material jet injection device, the defect of the known technology is overcome, abrasive material jet pore forming and fracturing are combined, and therefore layering can be precisely carried out in a vertical well or sectional fracturing can be precisely carried out in a horizontal well section.

The invention discloses a low-density superhigh-strength corrosion-resistant propping agent and a preparation method thereof. The propping agent comprises aggregate, thermoplastic phenolic resin, a thermoplastic phenolic resin curing agent, epoxy resin, an epoxy resin curing agent and a dispersant. The aggregate comprises, by mass, 80-90% of bauxite, 9-15% of coal gangue and 1-5% of clay. A mass ratio of the thermoplastic phenolic resin to the aggregate is 2-4%. A mass ratio of the thermoplastic phenolic resin curing agent to the thermoplastic phenolic resin is in a range of 12-18%. A mass ratio of the epoxy resin to the aggregate is in a range of 1-3%. A mass ratio of the epoxy resin curing agent to the epoxy resin is in a range of 5-20%. A mass ratio of the dispersant to the aggregate is in a range of 0.1-0.5%. The propping agent has density greatly lower than that of the general high-strength propping agent so that an oil field pressing crack cost is greatly reduced.

The invention discloses a static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs. The method includes the steps that a producing well is drilled to an oil and gas reservoir, and after well cementation, perforation or drilling is conducted on a production horizon to obtain an expansion hole; a blasting agent wrapped by a biodegradable film is put into the well, and carried by a hydrolytic enzyme solution to the expansion hole; under the action of the hydrolytic enzyme, the biodegradable film is hydrolyzed and then releases the blasting agent, the size of the blasting agent expands continuously after the blasting agent reacts with water and generates expansion pressure to continuously fracture the reservoir, so that cracks are formed; the fracturing is repeated for one to two times, the cracks are expanded through expansion stress, new cracks are extended out, and the cracks become a communicated crack network. Environment-friendly type non-explosion dangerous goods are used as the blasting material, purchasing, transporting and storing are safe and reliable, and using is convenient; when the method is used for fracturing and transforming the oil and gas reservoir, the action time of one-time fracturing is long, the acting efficiency is high, a communicated crack network channel can be formed through repeated fracturing, and the method is good in fracturing effect, low in fracturing cost and wide in application range.

The invention belongs to the technical field of solid propping agents for an oil/gas well fracturing technology, and discloses a low-density ceramsite propping agent taking low-aluminum high-silicon alumyte as a major raw material and a preparation method thereof. The low-density ceramsite propping agent is prepared from the following raw materials in percentage by mass: 90-96 percent of alumyte, 1-4 percent of manganese ore, 0.5-2 percent of hematite, 0-2 percent of clay and 0-2 percent of dolomite, wherein the alumyte is low-aluminum high-silicon alumyte; the mass percent of Al2O3 is 50-60 percent; and the mass percent of SiO2 is 12 percent. The method comprises the following steps of: smashing raw materials respectively; mixing according to a certain mixture ratio, grinding, and performing spray granulation; and sintering at the temperature of 1,320-1,380 DEG C for 0.5-2.5 hours. Crude low-aluminum high-silicon alumyte is adopted, so that the problem of supply tension of raw materials is solved, the production cost of alumyte is reduced by about 350 yuan/ton in comparison to alumyte of which the alumina content is over 65 percent, and the propping agent has a wide development prospect; and moreover, the bulk density and apparent density indexes of the ceramsite propping agent are reduced remarkably, and the cost of well fracturing is reduced simultaneously.

The invention relates to the technical field of ball fracturing sliding sleeves, in particular to a rotary control stepless ball fracturing sliding sleeve. The rotary control stepless ball fracturing sliding sleeve comprises an upper connector, a sliding sleeve body, a lower connector, an inner sliding sleeve and a rotary control sliding sleeve. The outer side of the lower portion of the upper connector and the inner side of the upper portion of the sliding sleeve body are fixedly installed together. The inner side of the lower portion of the sliding sleeve body and the outer side of the upper portion of the lower connector are fixedly installed together. The lower portion of the inner sliding sleeve and the sliding sleeve body are fixedly installed together through shear pins. Two or more internal fracturing holes are distributed in the upper portion of the inner sliding sleeve along the circumference. The rotary control stepless ball fracturing sliding sleeve is reasonable and compact in structure and convenient to use, stepless ball fracturing is achieved, technical support is provided for opening all fracturing reservoirs through fracturing balls in the same size, the number of fracturing layers is not restrained by the diameters of fracturing balls, pressure loss at ball seats with different diameters in the existing fracturing operation process is reduced, ball seat grinding and milling procedures are omitted, fracturing efficiency is improved, fracturing cost is reduced, and the rotary control stepless ball fracturing sliding sleeve can be applied to underground fracturing production increase operation.

The invention relates to a coal gangue ceramsite proppant and a preparation method thereof. The proppant comprises, by weight, 30%-70% of coal gangue, 20%-65% of flint clay, 5%-10% of a sintering aidand 1-3% of a forming agent. The coal gangue is solid wastes which are discharged in coal collecting process and coal washing process, the silica content is higher, the aluminum content is lower, thecalorific value of the solid waste coal gangue is fully utilized in the preparation process, meta components of the coal gangue are completely utilized again to reduce the volume density of sintered ceramsite to better adapt to the technical demands of oil well fracturing construction, fracturing cost is reduced, and the use of high-grade bauxite resources is reduced to help to protect the environment.

Disclosed is a permeable cement stone fracturing exploitation method for non-conventional oil and gas layer such as tight oil and gas, shale gas, coal-bed gas, combustible ice and so on. The method comprises the following complementary processes and embodiments: transporting, storing and pumping process for supercritical carbon dioxide; transporting, storing, preparing and pumping process for fracturing cement slurry; process for mixing the supercritical carbon dioxide and the cement slurry; process of fracturing the supercritical carbon dioxide and the cement slurry on ground; process of forming a permeable cement stone under the ground; and so on. The present invention provides a method for non-conventional oil and gas layer fracturing exploitation without using conventional fracturing proppant and fracturing fluid, having advantages of no flow-back fluid, less water, less material, less equipment, smaller area of well site, lower cost, better stimulation effect, environmental protection, and wide application.

The invention relates to a single-pipeline pressure-adjustment type double-end-blocked fracturing machine and a fracturing method. The single-pipeline pressure-adjustment type double-end-blocked fracturing machine comprises a tail hole sealing machine, a communicating pipe and a front part hole sealing machine which sequentially communicate with one another in a drilling direction; a fracturing unit is arranged between the front part hole sealing machine and the tail hole sealing machine; the fracturing unit consists of a pressure adjustment part and a fracturing part; before fracturing of anore deposit is carried out, the pressure adjustment part is used for setting the opening pressure of the fracturing part; the tail hole sealing machine is connected with a high-pressure water fillingdrill rod; the high-pressure water filling drill rod is connected with a pump station and extends into a drilled hole so that the fracturing unit is placed at a to-be-fractured position; the tail holesealing machine and the front part hole sealing machine are expanded and are tensioned on the wall of the drilled hole with increment of the water filling pressure; the water filling pressure continues to be increased until the water filling pressure is equal to the opening pressure; at the moment, the tail hole sealing machine, the pressure adjustment part and the fracturing part communicate with one another; and high-pressure water enters the fracturing part to realize fixed-point fracturing. The single-pipeline pressure-adjustment type double-end-blocked fracturing machine provided by theinvention changes the traditional double-pipeline fracturing way, makes the hydraulic fracturing operation be simpler by only one pump station and only one pressurization operation, and can greatly lower the fracturing cost.

The invention relates to a low-density high-strength andalusite fracturing propping agent and a production method thereof. The raw materials comprise: 65-75% of bauxite raw meal, 2-20% of andalusite, 5-20% of kaolinite, 1-8% of calcium aluminate cement, 3-10% of manganese ore powder. The production method comprises the following steps: weighing raw materials, grinding into fine powder, sieving, well mixing, adding into a rotating granulator for granulation, adding atomized aqueous vapor till the mixture becomes a spherical semifinished product, drying; sintering the semifinished product in a rotary kiln for 6-10 h with a kiln head temperature of 1300-1400 DEG C and a kiln tail temperature of 280-320 DEG C, taking the product out of the kiln to obtain a finished product. The product of theinvention has broken rates of 4.8% and 6.9% under pressures of 52 MPa and 69 MPa respectively, and has strength higher than that of other products of the same kind; the product has bulk density of 1.40-1.60 g/cm3, and apparent density of 2.60-2.85 g/cm3, and the density is lower than industrial standard; the product has high surface fineness, and can effectively reduce cost of petroleum fracturing.

The invention discloses an alcohol-soluble slickwater system for fracturing as well as a preparation method and application of the alcohol-soluble slickwater system, and relates to the technical fieldof acid fracturing agents. The slickwater system is composed of the following components in percentage by weight: 20.0-60.0% of a polyacrylamide polymer, 0.5-4.0% of nano particles, 0.1-3% of a surfactant, and the balance of organic alcohol.

The invention discloses a liquid and supercritical carbon dioxide tackifying switch surfactant and a compounding system thereof. The switch surfactant is a nonionic surfactant with a tertiary amine group; the switch surfactant is a polyhydric alcohol type or polyoxyethylene type nonionic surfactant with the tertiary amine group. The compounding system which is prepared on the basis of the switch surfactant and is applied to liquid and supercritical carbon dioxide tackifying comprises the switch surfactant and a tackifying polymer; the tackifying polymer is a long-chain fatty acid or a polyester with at least one of groups of amino, ether and alcoxyl, or polysiloxane which is modified by using at least one of groups of amino, polyether, acrylic acid, aryl and alkyl. According to the switchsurfactant, inverse phase wormlike micelle tackifying can be achieved, the hydrophilcity of the switch surfactant is improved through protonation of the tertiary amine, flowback can be achieved, finally recycling and repeated use of the surfactant can be achieved through deprotonation, and the fracturing cost can be reduced.

The invention discloses a high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and a preparation method thereof. The fracturing fluid contains a cationic surface active agent, and thestructural formula of the cationic surface active agent is shown as the following formula. In the formula, R<1>' is selected from saturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, unsaturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, and a compound as shown in the following formula, wherein R<1> is selected from saturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, and unsaturated alkyls with a carbon number n meeting a relationship of 16<=n<=24; and R<2> is selected from saturated alkyls with a carbon number C meetinga relationship of 3<=C<=7, unsaturated alkyls with a carbon number C meeting a relationship of 3<=C<=7, and short-chain alkylbenzene (C<=5). The cationic surfactant has good resistance to inorganic salts, and the principle is that the R<2> substituent groups block mutual proximity between polar head groups of the cationic surface active agent under a high-mineralization-degree condition, and thenprecipitation of the cationic surface active agent is avoided, so that the micelle continues keeping a dense three-dimensional network structure, and tackifying performance is improved.

The invention relates to a shale gas fracturing construction 3000 type equipment placing simulation method and realization which are used for shale gas pool fracturing construction and in the field of the petroleum industry. The simulation method mainly solves the problem of shale gas fracturing construction 3000 type equipment placing in current conditions. The simulation method mainly comprises the steps that a. for 3000 type fracturing equipment, 3D Studio Max is used for completing an equipment 3D model, and after the equipment 3D model and an established equipment placing generalized principle are subjected to datamation, the equipment 3D model and the established equipment placing generalized principle are used as a simulation database together; b. interface designing and function relation are set, wherein fracturing scale and well site condition parameters are input and recognized, and fracturing equipment and placing modes are optimized; c. an MFC class wizard and an interface are selected, and site construction parameter and database calling is completed; and d. timer events are used, and dynamic-static state loading of the 3000 equipment is completed. Practice shows that the realization of the method has certain economic benefit and obvious social benefit.

The invention provides a reservoir mining incentive structure and a shale gas reservoir mining method, and belongs to the technical field of resource mining. A first vibrator and a second vibrator arearranged on the upper interface and lower interface of a shale gas reservoir by the the mining incentive structure, and the first vibrator and the second vibrator separately release energy into the shale gas reservoir to drive the vibration of the shale gas reservoir. Under the action of acoustic vibration incentive, rock damage occurs, the rock strength decreases, the fracture pressure of the shale reservoir is reduced, and in the later stage of hydraulic fracturing transformation, the cost of hydraulic fracturing is reduced; meanwhile, the change of a stress state of the shale gas reservoiris conducive to the formation of a fracture net in the process of hydraulic fracturing transformation, the volume transformation of the shale gas reservoir is facilitated, the flow of shale gas is accelerated, and the decrease of shale gas reservoir pressure is accelerated; and the desorption of methane is prompted, the acoustic radiation effect can further promote the desorption of the methane,the production of shale gas wells is improved, the mining time of the shale gas reservoir is shortened, and the mining cost is reduced.