32results about How to "Improve mud performance" patented technology

A pneumatic tire comprises a tread portion, a pair of sidewall portions, bead portions formed radially inside the sidewall portions, shoulder blocks arranged in the tire circumferential direction with first pitches on at least one of end portions of the tread portion, side protectors protruding axially outwardly on at least one of the sidewall portions which is located on a side of the shoulder blocks, a recessed portion between a pair of side protectors adjacent in the tire circumferential direction. The side protectors are arranged in the tire circumferential direction with second pitches larger than the first pitches. Each of the side protectors is provided with at least one first groove extending radially inwardly from a side of the tread portion and terminating within the side protector and at least one second groove extending radially outwardly from a side of the bead portion and terminating within the side protector.

A method for double weighting parallel interference cancellation in CDMA mobile communication system, integrates ideas of both partial weighting method and weighting method based on Bayes rule. When making a decision on each symbol of the user, calculating reliability coefficient of a decision result on the symbol of the user according to the weighting algorithm based on Bayes rule; weighting regenerated signal of the symbol of the user with the reliability coefficient. During process of MAI estimating and removing, obtaining the MAI on the expected user from weighted regenerated signal of other users in chip level; and then setting a weight value, weighting the MAI with the weight value. Finally, removing weighted MAI from received signal, which means partially removing MAI produced by other users on the expected user. At the same time, the present invention also discloses a double weighting PIC method with simplified algorithm, which transfers weighting in chip level to weighting in symbol level, replacing a Hyperbolic tangent decision with a piecewise linear decision method or a look-up table method.

The invention discloses a three-protection-function water-base drilling fluid system. Raw materials comprise 1000 parts of tap water, 40-50 parts of bentonite, 2-3 parts of sodium carbonate, 0.5-1 part of sodium hydroxide, 3-5 parts of coating agents HLBE-2, 6-8 parts of filtrate reducers HLJ-1, 15-20 parts of filtrate reducers HLJ-6, 5-7 parts of polyanionic cellulose PAC-LV, 5-10 parts of high-temperature salt-resistant filtrate reducer HLKY-2, 20-25 parts of wall-fixing agents HLGB-3, 20-25 parts of liquid lubricants HLR-2, 20-25 parts of lubrication inhibitors HLRH-3, 20-25 parts of drilling fluid solid lubricants, 5-10 parts of inhibitors HLY-3, 70-80 parts of KCl, 2-2. 5 parts of gel plugging agents HLN-1, 10-15 parts of superfine calcium carbonate powder, and a weighting agent. Thethree-water-retention-base drilling fluid system has good inhibition performance and good plugging performance, and is used for drilling of mud rock-siltstone inclined shaft sections and horizontal sections. Therefore, a problem that the well wall is prone to instability in the drilling process of water-based drilling fluid is solved, and the three-protection function of protecting the well wall,protecting an oil-gas layer and protecting the environment is achieved.

The invention provides lignosulfonate for drilling fluid and a lignosulfonate preparation method. The lignosulfonate is obtained by mixed reaction of a complexing agent and sodium lignin sulfonate prepared from liquid glucose. By selection of special sodium salt of lignosulfonate and taking of the sodium lignin sulfonate prepared from liquid glucose as a starting material, the prepared lignosulfonate for drilling fluid has an excellent mud property no matter at the normal temperature or the high temperature, and generation of harmful waste residues in a preparation process is avoided.

The invention discloses single-field anhydrous stemming for a high-strength smelting small blast furnace as well as a preparation method and application of the single-field anhydrous stemming. The raw materials comprise, by mass, 20-30% of refractory aggregate, 10-20% of refractory fine powder, 8-15% of soft binding clay, 7-12% of feldspar powder, 15-20% of coke foam, 15-25% of an anti-erosion agent, 1-5% of waste high thermal conductivity graphite electrode powder, 0.5-2% of phenolic resin powder, and 3-8% of high temperature modified asphalt; the raw materials are mixed according to the proportion, tar serves as a binding agent, mud is discharged after the mixture is mixed and ground to a proper state, and the anhydrous stemming is obtained through mud extrusion forming. And the anhydrous stemming is transferred to a site, and is put into the furnace from an iron notch channel by using a mud gun machine to form a mud drum on the furnace wall. The water-free stemming has the advantages of favorable mud making performance, high curing speed, short blasting time, favorable sintering property, no dense smoke in the tapping process, basically no need of baking an iron notch, 25-30 minutes of tapping interval, short splashing time and favorable scouring and erosion resistance, and can meet the harsh requirements of high-strength smelting of small blast furnaces on the water-free stemming.

The invention relates to the field of building construction, and provides pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry. The pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry is prepared from, by weight, 1,000 parts of water, 75-85 parts of bentonite, 3-5 parts of sodium carbonate and 0.5-1.5 parts of sodium polyacrylate. The invention further provides a preparation method of the pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry. The pebble stratum deep and large foundation pit underground diaphragm wall retaining wall slurry has the advantages that sodium polyacrylate is adopted for replacing traditional CMC, the slurry wall protecting performance and theslurry recycling rate are greatly increased, and meanwhile corresponding environment contamination and material consumption are reduced; meanwhile, various indexes of the slurry prepared through theformula can meet the requirement of circulating slurry indexes, the wall protecting effect is good, and the groove wall stability is good.

The invention discloses a drilling mud formula and an automatic mud circulation purification device, and relates to the technical field of drilling mud. The mud specifically comprises mud raw materials, and the mud raw materials comprise, by weight, 1000 parts of clear water, 20 parts of bentonite, 4 parts of polyacrylamide, 4 parts of vegetable gelatin, 6 parts of potassium humate, 3 parts of sodium carboxymethyl cellulose, 3 parts of ferrochrome sodium lignin sulfonate, 4 parts of sodium carbonate, 4 parts of barite fine powder, 3 parts of dry sawdust, 4 parts of asbestos and 5 parts of polyacrylamide flocculant. The high-quality bentonite is selected, so that the slurry has the advantages of low relative density, low viscosity, small sand amount, small water loss, thin mud cake, strong stability, strong wall fixing capability, small rotation resistance of a drilling tool, high drilling rate, high slurry making capability and the like; the viscosity of the slurry can be increased by using sodium carboxymethyl cellulose, so that a thin film is formed on the surface of the soil layer to prevent the hole wall from peeling off, and the effect of reducing the water loss is achieved.

The invention provides iron-chromium sodium lignin sulfonate and a preparation method thereof. Sodium lignin sulfonate prepared through a sulfate method, a sugar solution and a complexing agent are mixed for a reaction, and the iron-chromium sodium lignin sulfonate can be obtained, wherein sodium salt in specific lignosulfonate is selected, mixtures of the sugar solution and the sodium lignin sulfonate prepared through the sulfate method serve as initial raw materials, and the prepared iron-chromium sodium lignin sulfonate has very good mud property at both normal temperature and high temperature.

The invention relates to a pneumatic tire which improves mud road performance and durability. A plurality of tire shoulder pattern blocks (6) of the pneumatic tire (1) are arranged along a circumferential direction of the tire. Each tire shoulder pattern block (6) has a side face (11) extending from a grounding end (6t) of a tire axial outer side of a tread (16) towards a tire radial inner side. In a tire meridian section containing a tire rotating shaft under a normal state, the side face (11) includes a first arc part (12) having a concave arc-shaped profile, the concave arc shape has a center in a position closer to the tire axial outer side than the ground end (6t) and the radius of curvature is 50% to 100% of a tread grounding width (TW). A tire radial distance (Ha) between the outermost end (2e) in a tire radial direction of a tread (2a) of a tread part (2) and an inner end (12i) of the tire radial direction of a first arc part (12) is 5% to 10% of a tire maximum width.

A tire includes a tread portion including a main groove, a first block and a second block which are adjacent to one another in a tire axial direction through the main groove. The main groove includes first groove elements and second groove elements having groove widths smaller than that of the first groove elements. The first block includes a first ground contact surface, a first sidewall facing one of the second groove elements, a first corner portion between the first ground contact surface and the first sidewall, and a first recess being cut out the first corner portion locally. The second block includes a second ground contact surface, a second sidewall facing said one of the second groove elements, a second corner portion between the second ground contact surface and the second sidewall, and a second recess being cut out the second corner portion locally.

The invention belongs to the technical field of underground pipeline construction, and discloses a long-distance pipeline laying construction method which comprises the steps of guide hole manufacturing and pipeline back dragging. The guide hole manufacturing comprises the steps that a ground magnetic field is established with a preset pipeline route as the center, and interference of a high-voltage electromagnetic field is eliminated; positioning information based on the ground magnetic field and the pipeline route is obtained through detection guiding control equipment carried on a drill bit drill rod, the positioning information is transmitted back to a ground control terminal, and the drilling angle and direction are controlled based on a received control instruction; and after the guide hole is drilled through, chambering and hole cleaning operations are executed until the guide hole is manufactured. According to the long-distance pipeline laying construction method, stable construction in a high-voltage electromagnetic field area can be guaranteed, and the long-distance pipeline laying construction method can adapt to pipeline back-dragging construction in a small space.

A tire 1 comprises a tread portion 2, a tread edge Te provided in the tread portion 2, a shoulder main groove 3 extending continuously in the tire circumferential direction in the tread portion 2, and a shoulder land region 5 being defined between the tread edge Te and the shoulder main groove 3. The shoulder land region 5 is provided with a shoulder lateral groove 10 connecting between the shoulder main groove 3 and the tread edge Te and a first shoulder lug groove 11 extending axially inwardly from the tread edge Te and terminating within the shoulder land region 5. An angle θ1 of the shoulder lateral groove 10 with respect to the tire axial direction is larger by 10 to 40 degrees than an angle θ2 of the first shoulder lug groove 11 with respect to the tire axial direction.

The invention relates to a continuous type coke furnace hot-state roof grouting system based on the pressure balance of multiple groups of delivery pipes. The continuous type coke furnace hot-state roof grouting system comprises an air compressor, a first slurry mixer, a first slurry delivery pump, a second slurry mixer, a second slurry delivery pump and a slurry pressure uniform distributor, wherein the air compressor is connected with the air inlet valve of the first slurry mixer through an air pipe; the slurry outlet of the first slurry mixer is connected with the water inlet of the second slurry mixer through the first slurry delivery pump; the slurry outlet of the second slurry mixer is connected with the slurry pipe inlet of the slurry pressure uniform distributor through the second slurry delivery pump; the first slurry output pipe, second slurry output pipe, third slurry output pipe and fourth slurry output pipe of the slurry pressure uniform distributor are respectively connected with respective grouting pipes. The continuous type coke furnace hot-state roof grouting system disclosed by the invention has the advantages of simple structure, scientificity and reasonability in design, lower cost, high production efficiency and good slurry property without pollution and effectively reduces the manual labor intensity.