110 results about "Cementation process" patented technology

The invention relates to leaking stoppage cement slurry for well cementation and a preparation method thereof. The leaking stoppage cement slurry consists of the following components in parts by weight: 100 parts of oil-well cement, 50-150 parts of water, 0.01-8 parts of fibrilia, 1-20 parts of dispersing agent, 1-20 parts of filtrate reducer, 5-50 parts of alkali regulator, 1-10 parts of retarder and 0-1 part of defoaming agent, wherein the dispersing agent is lauryl sodium sulfate or sodium hexametaphosphate; the filtrate reducer is 2-acrylamide-2-methylpropanesulfonic acid or hydroxyethylcellulose; the alkali regulator is silicon powder; the retarder is sodium lignin sulfonate or citric acid; the defoaming agent is dimethyl silicon oil or tributyl phosphate; and the fibrilia is one or the mixture of two or more of jute, flax, hemp, ramie and sisal. The invention effectively solves the problem of leakage loss of cement slurry and inherent brittleness of set cement in the well cementation process on the premise of meeting various engineering performances required by the well cementation and provides the guarantee for subsequent operation of oil well gas.

The invention discloses a niobium alloy high temperature antioxidation silicide coating and a preparation method thereof. Firstly, molybdenum layers, the particle size of most of which is 0.6-1.0 Mu m and the thickness of which is 50 Mu m-80 Mu m, are sintered through vacuum on a niobium alloy substrate surface layer. Under the protection of argon, a MoSi2 coating is made through the pack cementation silicification. The pack cementation silicification activator is NaF, the promoter is Al2O3, and the weight ratio of Si to Al2O3 to NaF is 35-45 to 50-65 to 3-5. The complex pack cementation process is suitable for preparing the silicide coating with high melting point and can coat the inside and the external surface of irregular structural components without the influences of the shape and the size of the components. The components and the thickness of the coating prepared through the method are uniform. The density is greatly improved compared with that of a material pulp reaction sintering method. With simple process and low requirement on equipment, the invention is a novel high temperature coating preparation technology.

The invention relates to an antibiosis stainless steel manufacturing method used double layers glowing metallic cementation process. The stainless steel base material is put into double layers glowing metallic cementation furnace to cement antibiosis element. Its working conditions are as follows: gas pressure in the furnace is 1.33-133Pa; source-electrode voltage is 0.7-1.4KV; work piece voltage is 0.6-1.2KV; temperature is 800-1050 centigrade degree; interelectrode distance is 10-20mm; cementation time is 2-4h; antibiosis element is Cu or Ag; the time of vacuum aging treatment after Cu cementation is 1-10h; and temperature is 450-900 centigrade degree. The production technology is simple, and holds base material inherent corrosion resistance. The stainless steel surface has diffused layer containing copper or silver phase. Thus its surface has good germ resistance.

The invention discloses a method of balancing pressure for well cementation. The method comprises the following steps: a), adopting a cement slurry system of conventional density on a cementing isolation section; b), reducing pressure of a liquid pillar at the upper part of an annulus; and c), controlling wellhead back pressure of the annulus to ensure that the pressure in a weak layer is kept balanced. According to the well cementation process technology provided by the invention, a stratum can be effectively prevented from being pressed to leak, so as to soundly protect an oil-gas production layer; the strength of a cement sheath is guaranteed; the risk of environment pollution is low; the range of a stratum is wide; and the method is suitable for a reservoir stratum which is easy to leak and low in pressure.

The invention relates to the technical field of detection of the cementation quality of a well cementation interface II, in particular to a visual system for testing the cementation quality of a specially-shaped well cementation interface II and the intensity of a specially-shaped body. A simulated formation cavity and a well cementation cement/cement stone cavity are communicated to form an experimental cavity, and a perpendicular communicated surface is an interface II; circular sealing retainer rings are respectively arranged at the top and the bottom of the experimental cavity; a cement stone lifting die is arranged at the lower part of the well cementation cement/cement stone cavity; a thermocouple is arranged in the simulated formation cavity; multiple reaction gas injection pipes are arranged in the simulated formation cavity; visual windows are respectively formed in the sides of the simulated formation cavity and the well cementation cement/cement stone cavity; a sealing coveris arranged at the top of the simulated formation cavity; the top of the well cementation cement/cement stone cavity is sealed and is provided with a gas-liquid inlet/outlet. The device can be used for evaluating the cementation quality of the interface II and testing soil in a soft soil stratum and the quality of a cemented surface of cement in a well cementation process of a hydrate-containingstratum.

The invention relates to a circular-heating rapid nitriding catalysis process which comprises the following steps: ammonia gas is injected to discharge air after workpiece is put into a nitriding furnace; the nitriding furnace is heated from room temperature to T1 temperature and T2 temperature with two sections of heat insulation; and then another two section of heating and heat insulation are carried out at T1temeprature and T2 temperature; the ammonia gas resolution ratio is controlled within the range of 18-60 percent, and the nitriding is carried out; a thickening process is carried out by fully utilizing the strong-nitriding high-speed step, the depth of a nitriding layer and the nitriding time according to a plurality of parabolas with different P values; white powders of nitriding catalysis agent containing chlorinated rare-earth elements are put into a steel tube along with the workpiece from the nitriding charge, wherein the nitriding catalysis agent comprises the following components according to percentages by weight of 3-10 percent of chlorinated rear-earth, 5-35 percent of ammonium chloride, 20-50 percent of calcium chloride and 20-55 percent of sodium carbonate; two ends of the steel tube are tightly bound by aluminum silicate fiber or rock wool and are then put into the furnace, and the nitriding catalysis agent can play a nitriding effect during the whole nitriding process. The invention improves the absorption capacity of the surface of the workpiece to active nitrogen atoms, accelerates the nitriding speed of the nitrogen atoms, shortens the nitriding insulation time by more than 44.4 percent, saves the electrical energy by more than 32 percent and shortens the production period by more than 32.7 percent.

The invention discloses a novel casing pipe restoration reinforcing agent, a preparation method and a construction method thereof. A formula comprises epoxy resin, curing agents, alloy powder, modified carbon fiber, coupling agents, dispersing agents and organic solvents. The formula provided by the invention can be used for oil gas field casing damage well casing pipe restoration and reinforcement; a grading hoop is used in the well cementation process; the casing pipe pressure-resistant grade cannot meet the oil gas well casing pipe restoration and reinforcement with high high-construction-pressure fracturing construction pressure resistant requirements. The casing pipe restoration reinforcing agent prepared by using the formula and the preparation method can realize the curing at the normal temperature and stratum temperature in a certain time; before curing, the viscosity is low; the flowability is high; the pumping injection is easy; after curing, the intensity and the material are similar to those of the casing pipe; the materials can be well fused with the metal casing pipe; after curing, the sealing effect is good after restoration on the sleeve damage position; the effective period is long; the anti-tension and pressure-resistant intensity is high; the bonding intensity with the metal sleeve is high; the acid and alkali resistance and anti-corrosion performance are realized; the damaged part of the restored casing pipe can be enabled to have the identical inner diameter with the original casing pipe; the diameter shrinkage and the diameter change cannot occur; thelater stage taking out tools and pipe columns are not influenced.

The invention discloses a followed vibration well cementation method. In the method, in the well cementation process, a rubber plug moves in a sleeve downwards and simultaneously vibrates, and after the rubber plug moves downwards to the well bottom and touches and presses a float collar to make the float collar stop, the rubber plug continuously vibrates until cement slurry is about to be jelled. Through the method, the followed vibration in the whole well section from the well mouth to the well bottom can be implemented, the defect of single function of the rubber plug is overcome, and the aim of moving the sleeve of the whole well section is fulfilled, so that the sleeve and cement interface cementing quality is improved, the cement stone strength is improved and better application effect is achieved; and on the basis of not changing the conventional production and construction processes, the replacement function of the conventional rubber plug is still utilized, a sleeve resonanceprinciple is applied, and when the rubber plug moves in the sleeve, the followed vibration in the whole well section from the well mouth to the well bottom is implemented, so that the defect of single function of the rubber plug is overcome, vibration waves having the frequency same as the natural frequency of the sleeve of the oil well can be generated, and the well cementation quality is effectively and obviously improved.

The invention relates to a heat treatment processing method for steel plate multicomponent alloy co-cementation, overcoming the shortcoming that anti-corrosion performance can not be achieved in the current heat treatment co-cementation process. The method comprises the following steps: 1, adding cementation promoter and floating balls into prepared powdery co-cementation alloy elements which comprise 1.5-2% of Zn powder, 0.2-0.7% of Al powder and 0.05-0.2% of rare earth powder by weight percent; 2, putting steel plates to be subject to heat treatment to a co-cementation furnace and then fixing, putting the co-cementation alloy elements into the co-cementation furnace, and then sealing the co-cementation furnace, wherein the steel plates are spaced and arranged in parallel; 3, vacummizing the co-cementation furnace and simultaneously starting to heat until 400-500 DEG C, insulating for 6-8 hours, and then cooling down slowly; and 4, taking the steel plates out of the furnace and carrying out anti-corrosion test comprising thickness test and rusty spot test. Through the co-cementation heat treatment, the alloy elements are cemented into the surfaces of the steel plates to form anti-corrosion layers, and the size of the steel plates is not changed, and the formed anti-corrosion layers have better effects.

A process by which a nickel-based superalloy substrate prone to deleterious reactions with an aluminum-rich coating can be stabilized by carburization. The process generally entails processing the surface of the substrate to be substantially free of oxides, heating the substrate in a non-oxidizing atmosphere to a carburization temperature, and then contacting the surface of the substrate with a carburization gas mixture comprising a diluted low activity hydrocarbon gas while maintaining the substrate at the carburization temperature. While at the carburization temperature and contacted by the carburization gas, carbon atoms in the carburization gas dissociate therefrom, transfer onto the surface of the substrate, diffuse into the substrate, and react with refractory metals within the substrate to form refractory metal carbides within a carburized region beneath the surface of the substrate. The substrate is then cooled in a non-oxidizing atmosphere to terminate carbide formation.

The invention provides an industrial waste coagulating agent which comprises 3-20 wt% of sodium sulfate, 10-80 wt% of gypsum, 0-20 wt% of silica fume, 0-30 wt% of quick hardening cement, 5-75 wt% of alum and 2-10 parts of quick lime. Under the synergistic effect of all components and the condition that no or few cementitious materials are added, a cementation process of industrial waste can be completed by activating the activity of industrial waste and using effective components in industrial waste, a solidification body meeting the strength requirement of the goaf filling material is formed, the cost is low, and indirect discharge of waste cannot be caused. The goaf filling material comprises industrial waste and the industrial waste coagulating agent in a mass ratio of (3:1)-(15:1), the usage amount of the industrial waste coagulating agent is small, the cost is low, indirect discharge of waste cannot be caused, industrial waste can be effectively and reasonably used, and sustainable development of industrial production and economy is guaranteed.

The invention relates to an experimental method for simulating cementing in a well cementation process. The experimental method comprises the following steps: firstly assembling experimental equipment, wherein the experimental equipment comprises a shaft simulating system, a drilling fluid circulating system, a cementing system and a computer data processing system, and the shaft simulating system comprises an inner organic glass tube for simulating a drill column, an outer organic glass tube for simulating a casing pipe, an internal rotating motor and a check valve; secondly, simulating drill fluid direct circulation, direct circulation of cementing in the well cementation process, drill fluid reverse circulation, and reverse circulation of cementing in the well cementation process. The experimental method has the benefits as follows: the method is simple and easy to operate, students can personally carry out simulation operations, so as to understand direct circulation of cementing in the well cementation process, reverse circulation of drill fluid and reverse circulation of cementing intuitively and visually, the enthusiasm of the students for learning can be kindled, and the understanding and mastering of students for direct circulation of cementing and reverse circulation of cementing in the well cementation process can be deepened.

The invention discloses a stainless steel low-temperature powder embedding iron-aluminum co-cementation agent and a pack-cementation process method. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent is characterized in that aluminum powder is taken as main an aluminum supplying agent, iron powder is a main iron supplying agent, iron-aluminum powder is taken as active filler to replace the conventional inactive ceramic powder filler, aluminum trichloride is taken as an activating agent, and a small amount of rare earth chloride can be added to be used as a catalyst; and a process comprises the following steps of: completely and uniformly mixing the cementation agent, then putting the cementation agent and a stainless steel sample to be subjected to iron-aluminum copermeation processing into a cementation tank, mixing sodium silicate with fire clay, carrying out sealing and drying, so as to obtain an iron-aluminum compound alloy layer with the certain thickness, wherein the alumetizing temperature is 380-600 DEG C, and the temperature is kept for 10 or more than 10 hours. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent has the advantages that the process method is simple, devices required for low-temperature embedding iron-aluminum co-cementation are simple, the cost is low, the aluminum content of the surface of the obtained iron-aluminum compound alloy layer is high, the iron-aluminum compound alloy layer has a very strong binding force with a matrix and good intermediate temperate oxidation resistance and corrosion resistance and can well protect the matrix.

The invention discloses a sectioned well cementation technology for deep trona drilling and mining. The sectioned well cementation technology comprises the following steps that firstly, a whole wellbore is sectioned, and a formation packer and a grading hoop are mounted on a well cementation sleeve in a series-connection mode; then the lower sleeve well section is sealed and reinforced by adoptinga positive circulation method, a rubber plug of the formation packer is opened firstly, thus the rubber plug and the well wall are sealed, a cement down channel is cut off, then the grading hoop is opened, and first-stage cementing well cementation operation is started; after cement slurry is injected, the grading hoop is closed; after the cement slurry is initially solidified, second-stage cementing well cementation operation is conducted on the upper well section; and after cement is solidified, the rubber plug is drilled, a center pipe is lowered in, and well completion is achieved. A whole well is divided into the two parts according to geologic conditions and downhole conditions, the problems that in the previous first-time well cementation process, the pressure intensity is high, astratum is prone to being pressed to leak, or up-hole of an upper cement slurry face of a leakage layer is not high are solved, the well completion quality is greatly improved, and the service life ofthe production well is prolonged.

The invention discloses a method for manufacturing carburization bearing steel for a high speed train and aims to reduce contents of aluminum and titanium in steel to the minimum, reduce content of gas in steel and produce the ultrapure and ultra-fine grain carburization bearing steel with ultralow gas content through selecting specially-made high-purity ingot iron and pure metal charge and adopting vacuum induction + vacuum self-consuming smelting process. The method has the following advantages: the ultrapure carburization bearing steel with ultralow gas content is obtained, wherein content of hydrogen is not greater than 0.0001%, content of oxygen is not greater than 0.0006%, content of nitrogen is not greater than 0.0009%, content of fine series inclusions of A category, B category, C category and D category of nonmetallic inclusions is not greater than grade 1.0, content of Ds category is grade 0.5, and other types of inclusions are not contained; the grain size grade is grade 7.0 or above after the cementation process is adopted for treatment.

The invention discloses a method for preparing a micrometer-particle-contained high-temperature-oxidation-resistant composite coating on the surface of niobium alloy. The method comprises the steps that firstly, a Ni-CeO2 plating is deposited on a substrate through a composite chemical plating process; and an Al-rich penetration layer is deposited on the plating through a pack cementation process, and the composite coating is formed. The composite coating prepared through the method can be well combined with the substrate, the coating is uniform and compact and good in high-temperature oxidation resistance and can bear oxidation at the temperature at 1200 DEG C, the service life of the coating is prolonged, and the process is simple.

The invention discloses a drilling liner pressure control well cementation process, and belongs to the technical field of oil and gas development well cementation. The drilling liner pressure controlwell cementation process sequentially comprises a casing running stage, a drilling liner hanger seating and hanging stage, a cementing and replacing stage, a bump pressure and drill string pulling-outstage and a setting waiting stage. In the casing running stage, the drilling liner hanger seating and hanging stage, the cement injecting and replacing stage, the bump pressure and drill string pulling-out stage and the waiting stage, the well bottom circulation equivalent density of the narrow safety density window well section is kept between the pore pressure equivalent density and the rupturepressure equivalent density corresponding to the narrow safety density window well section by controlling the wellhead annulus pressure. According to the well cementation technology, through wellheadannulus pressure control, the well bottom circulation equivalent density corresponding to the narrow safety density window well section is made to be between the pore pressure equivalent density andthe rupture pressure equivalent density, it is guaranteed that a pressure-bearing weak stratum is not pressed to leak while the oil and gas display layer is pressed stably, the drilling liner well cementation construction risk is reduced, and the well cementation quality is improved.

The invention discloses a well cementation process suitable for a gas field. The well cementation process comprises the following steps of injecting drilling fluid into a well to perform a pressure-bearing test, and performing leaking stoppage for a leaked stratum if leakage occurs in the well; driving a sleeve to the well bottom, and filling mud into a position between the well wall and the sleeve; sequentially injecting prepad fluid, first well cementation fluid and second well cementation fluid into the sleeve, then, starting to release a rubber plug, and utilizing the rubber plug to scrapeoff the first well cementation fluid and the second well cementation fluid on the inner wall of the sleeve; and injecting plug pressing fluid into the sleeve until touching and pressing happen, and ending well cementation. The pressure-bearing test is performed before the sleeve is driven in, and leakage prevention and stoppage are performed on the leaked stratum, so that pressure-bearing abilityof a well shaft can be improved.

The invention discloses a household garbage incineration fly ash reduction recycling treatment method. Garbage incineration fly ash serves as hazardous waste, but heavy metal in the garbage incineration fly ash has the huge potential and value of recycling. The method comprises the following steps that 1, fly ash, acid and an oxidizing agent are jointly added into a pickling tank to be stirred andmixed, and pickling slurry is generated; 2, the pickling slurry is subjected to solid-liquid separation, and pickling liquid and pickling waste residues are obtained; and 3, after the pickling wasteresidues are washed, ash residues capable of being recycled are obtained. According to the method, the acid leaching technology is optimized in the manner of adding the oxidizing agent; and the oxidizing agent is added, the oxidizing condition can be maintained in the whole leaching period, the oxidation-reduction potential is constantly kept in the state larger than 300mV, accordingly, the situation that metal components in the slurry are oxidized, and consequently PbCu0 alloy is formed in the reduction cementation process is prevented, and the leaching rate of Pb, Cu, Cd and Zn ions is obviously increased.

The invention relates to a complete unit used for tracking and positioning a rubber plug through a sonar system in the petroleum well cementation process, in particular to a device for tracking and positioning the rubber plug through sonar. The device comprises the rubber plug and a sonar generating and data processing system. The rubber plug is provided with a sonar array composed of a plurality of underwater acoustic transducers, wherein the sonar array is connected with the sonar generating and data processing system through sonar signals. Through the sonar positioning technology, the position of the rubber plug in a well, the distance between the rubber plug and a wellhead and the motion state of the rubber plug can be displayed by a data transmitting and processing system in real time, construction is facilitated, a technician is assisted in analyzing and solving problems and judging well conditions in time, the well cementation success rate can be greatly increased, and the number of down hole problems is reduced.

The present invention provides wellbore pressure control system and method for well cementation stages, and relates to the offshore oil and gas exploitation field. The wellbore pressure control system comprises: an injection pump; and a control device, configured to control the injection pump to inject a fluid or gas through an injection pipeline to a return pipeline that communicates with an annular space of the wellbore to decrease the pressure in the return pipeline and thereby decrease the pressure in the annular space, wherein, the density of the fluid or gas is lower than the density of a drilling fluid in the annular space. The technical scheme of the present invention can effectively prevent leaky zones from being fractured by high-density cement slurry in the well cementation process that may cause safety accidents such as well kick and well blowout, etc.

The invention discloses high temperature-resistant oil well cement, underground high temperature-resistant oil well cement paste and a well cementation process method. The high temperature-resistant oil well cement comprises 65 to 95 weight parts of monocalcium aluminate and 5 to 35 weight parts of dicalcium silicate which are used as main components and citric acid. The underground high temperature-resistant oil well cement paste comprises 50 to 56 weight parts of 50 to 56 weight parts of high temperature-resistant oil well cement, 44 to 50 weight parts of clear water, and 0.5 to 1.5 weight parts of retarder citric acid. The thickening time of the underground high temperature-resistant oil well cement paste is controlled to be 2 to 9 hours by the retarder citric acid. When the underground high temperature-resistant oil well cement paste is used for well cementation, a well can resist 800 DEG C and more than 60 MPa, and elastic modulus is less than 10 GPa; and the underground high temperature-resistant oil well cement paste can be applied to thickened oil thermal wells, extradeep wells, very deep wells and geothermal wells.