163results about How to "Good settlement stability" patented technology

The invention provides an expanded flexible well cementing grout and a preparation method thereof. The grout comprises the following components in parts by weight: 100 parts of cement, 6-14 parts of toughening material, 3-80 parts of reinforcing material, 8-120 parts of density modifier, 0.5-2.5 parts of suspension stabilizer, 20-40 parts of high-temperature stabilizer, 35-100 parts of distilled water, 0.5-2 parts of dispersant, 0.5-4 parts of fluid loss agent, 0.3-4 parts of retarder, 0.1-2 parts of foam inhibitor and 0.1-2 parts of defoamer. The invention further provides a preparation method of the expanded flexible well cementing grout. The grout has good sedimentation stability; and the set cement has the characteristics of micro expansion, high strength and low elasticity modulus, and can avoid the phenomena of micro cracks, micro annuluses, even fracture and the like caused by cement sheaths in subsequent operation of gas storage wells, shale gas wells, dense oil-gas horizontal wells and the like, thus realizing good zonal isolation and providing a technical support for long-term, safe and effective operation of oil-gas wells.

The invention relates to a preparation method of large pore volume and large pore diameter silica. With industrial water glass as silica source, water soluble polymer and surfactant as hydrophobic agent and hole forming template, by controlling reaction conditions such as temperature, hydrophobic agent, final ph value, etc., the large pore volume silica products are produced; the pore diameter is narrowly distributed, the pore volume is between 2-2.5cm3/g and the average pore diameter is between 18-35 nm. Especially, the more optimal three-step heating regulation is more beneficial to the stability of hole forming and hole structure and that the distribution of pore diameter reaches between 25-35nm is more proper to be used as flatting agent.

The invention relates to a cement paste toughening agent and application of the cement paste toughening agent in preparation of a cementing flexible cement paste. The toughening agent is prepared by modification of rubber powder; the modification of rubber powder includes the steps of cleaning, activating, etching and grafting; the cementing flexible cement paste prepared by the toughening agent is prepared from the following components in parts by weight: 100 parts of portland cement, 5-50 parts of modified rubber powder, 10-40 parts of a toughing agent, 15-80 parts of a density regulator, 35-65 parts of water, 0.5-2 parts of a dispersing agent, 0.5-3 parts of a fluid loss agent, 1.5-4 parts of a retarder and 0.1-2 parts of a defoamer. The inherent performance of a substrate is not changed by plasma treatment on the rubber powder; no pollution is generated; the cement paste toughening agent is simple in process, convenient to operate, stable in hydrophilism through the grafted rubber powder, small in effect from timeliness, and low in handling expense; the flexible cement paste prepared from the modified rubber is good in sedimentation stability; the mechanical property is obviously improved; the cement construction requirements of the scene can be completely met.

The magnetic rheologic liquid is composed of components: chelation type surfactant / carbonyl iron hull type magnetic compound particles, and silicone oil based compound assorted carrier liquid prepared from silicone oil and additive. The additive includes thixotropic agent, antioxidant, antiwear additive, and surfactant. The method for preparing the liquid includes steps: mixing round surfactant being added to silicone oil; next, adding antioxidant, thixotropic agent, and antiwear agent, then mixing them to obtain silicone oil based compound assorted carrier liquid; adding magnetic compound particles to the carrier liquid, and after procedures of mixing, ballmilling, and separating out friction balls, then sealing the liquid inside plastic bottle; stable silicone oil based magnetic rheologic liquid is obtained after series of procedure: placing the plastic bottle in magnetic field, taking out the liquid, and mixing etc. The liquid is applicable to damper, variator for cars etc.

The invention discloses a well cementing cement material with high thermal conductivity for geothermal exploitation. The well cementing cement material comprises water, ordinary Portland cement (P.O442.5), a thermal conductive reinforcing material, a JSS water reducing agent, sodium chloride (NaCl) and triethanolamine (TEA); according to the water cement ratio, the weight ratio of the water to theordinary Portland cement is 0.5-0.7; with the mass ratio of the ordinary Portland cement as reference, the mass ratio of the thermal conductive reinforcing material is 10%, the mass ratio of the JSSwater reducing agent is 0.2-0.4%, the mass ratio of the sodium chloride (NaCl) is 0.3-1.3%, and the mass ratio of the triethanolamine (TEA) is 0.01-0.03%. The well cementing cement material with highthermal conductivity for geothermal exploitation has the advantages of being conductive to reducing the density of cement grout, having a good effect when low-density cement grout needs to be utilized, shortening the coagulating time, being better in sedimentary stability, meeting requirements in compressive strength and being greatly improved in thermal conductivity.

The invention discloses well cementation cement paste with a high water-cement ratio, low cost and a low density. The well cementation cement paste is prepared from the following raw materials in parts by weight: 40 to 100 parts of oil well cement, 25 to 60 parts of coal ash, 30 to 40 parts of silica fume, 2 to 3 parts of an early strength agent, 2 to 8 parts of a ternary exciting agent, 3 to 3.5parts of a fluid loss agent, 0 to 0.2 part of a dispersing agent, 0.2 part of a defoaming agent and 180 to 272 parts of clean water, wherein the ternary exciting agent is a mixture of soda lime and magnesium sulfate, the mass ratio of the soda lime to the magnesium sulfate is 9 to 1, and the soda lime and the magnesium sulfate are both sieved by a 100-mesh sieve. Meanwhile, the invention further discloses a preparation method of the well cementation cement paste preparation method. The well cementation cement paste has low cost; after the ternary exciting agent is added, the compressive strength is improved, and a requirement of well cementation for the strength of low-density cement paste is met; furthermore, expansibility is improved, cement paste micro annular spaces caused by the inherent shrinkage character are reduced, and the risk of poor wellhole sealing safety is reduced.

The invention discloses an ultralow-density cement paste system for well cementing. The system comprises, by weight, 100 parts of oil well cement, 5-8 parts of micro silicon, 0-4 parts of oil well ultrafine cement, 25-40 parts of lightening materials, 2-5 parts of suspension stabilizer, 0-5 parts of coagulant, 1.0-1.2 parts of fluid loss agent, 1.0-1.5 parts of dispersing agent and 95-125 parts ofwater, wherein the particle size of the micro-silicon is 0.2-2 micron; the lightening materials comprise at least two of sodium bentonite, palygorskite, expanded perlite, hollow glass beads and hollow ceramic micro-beads. The ultralow-density cement paste system for the well cementing is suitable for well cementing operation of a low-pressure stratum which is likely to leak, and the manimum density can be 1.04 g/cm<3>. The ultralow-density cement paste system has the advantages of being rapid in setting at low temperature, rapid in strength development in the early stage, good in sedimentation stability and low in water loss.

This invention belongs to compound material and function material technique field and in detail to light magnetic particles with magnetic rheologic liquid and its process method. The material uses nanometer tube special electromagnetism property and a layer of Fe#-[3] O#-[4] on the surface. It in detail is processed with the nanometer tube, dispersant, strong acid, trivalence iron salt, two iron salt and alkali as certain weight proportion through certain process.

The present invention provides a process, which includes:

• • coating at least a portion of a surface of at least one silica particle with at least one wax, wherein the coating is carried out in at least one gas at a temperature above the melting point of the wax and below the decomposition temperature of the wax, to obtain at least one wax-coated silica particle. Other embodiments of the present invention provides processes for impregnating the silica particle with wax and uses of the wax-coated or wax-impregnated particles.

A liquid colloid filling low-temperature well-cementing cement mortar system is provided. The system is characterized in that the system includes 100 parts by mass of Portland cement, 80-120 parts by mass of ultrafine Portland cement, 10-30 parts by mass of hollow glass microbeads, 10-20 parts by mass of micro-silicon, 8-12 parts by mass of liquid colloid, 2-6 parts of an early strength agent, 1-2 parts by mass of drag reducer, 4-8 parts by mass of a water loss reducing agent, 1-2 parts by mass of a defoamer and 120-150 parts of water. According to the system, the density of the system is adjustable in a range of 1.35-1.65 g/cm<3>, the low-temperature early strength is high, thickening performance and fluidity are good, the water loss amount is low, and the system has excellent anti-fluid-channeling performance, can be used for well cementing for deepwater surface layer sections, can save working time and costs and can provide safe and efficient technical supports for deepwater oil and gas exploitation.

The invention relates to a high-temperature-resistant suspending agent for flexible cement mortar and a preparation method thereof, and cement mortar, belonging to the field of oil exploration. The suspending agent comprises, on the basis of 100 parts by weight of water, 100 parts of water, 20 to 50 parts of spherical oxide, 5 to 8 parts of short fibers, 3 to 8 parts of silicate and 3 to 8 parts of latex. After addition of the suspending agent provided by the invention, the cement mortar has excellent settlement stability and has density difference of no more than 0.02 g/cm<3>; obvious upward-floating of elastic particles does not occur; and rheological properties of the cement mortar with the suspending agent are almost same at different temperatures.

The invention discloses an endogenous toughened corrosion-resistant cement mortar system which is composed of the following components in parts by weight: 100 parts of high-sulfate-resistance Grade-G oil well cement, 5-35 parts of microcrystal calcium aluminoferrite, 0-25 parts of micro silicon, 1.0-4.5 parts of water-loss control agent, 0.5-3.0 parts of dispersing agent, 0.2-3.0 parts of thickening time control agent and 44-80 parts of water. The microcrystal calcium aluminoferrite is prepared by high-temperature calcination and shock cooling. The micro silicon is a density regulator. The water-loss control agent is polyvinyl alcohol, polyacrylamide or carboxymethyl cellulose. The dispersing agent is sodium hexametaphosphate, melamine formaldehyde resin, sodium lignosulfonate or methyl cellulose. The thickening time control agent is boric acid, gypsum, sodium borate or a mixture thereof. The endogenous toughened corrosion-resistant cement mortar system has the advantages of excellent impact resistance, higher compression strength, high volume stability and small changes of porosity and permeability, has important meanings for ensuring safe and efficient development of shale gas, and thus, has broad market prospects.

The invention discloses a dispersive solid fluid loss agent for seawater cement slurry and a preparation method of the dispersive solid fluid loss agent. The preparation method comprises the following steps: (1) dissolving allyl polyethylene glycol and carboxylic acid monomers into water; (2) adding 2-acrylamido-2-methylpropanesulfonic acid and acrylamide monomers, uniformly stirring, heating, and adjusting the pH value, so as to obtained a mixed solution; and (3) adding an initiating agent into the mixed solution to react to generate faint yellow viscous liquid, and carrying out freeze drying, grinding or crushing. The dispersive solid fluid loss agent disclosed by the invention is capable of blocking pores of cement without thickening a cement slurry system and is suitable for being used as an oil-well cement fluid loss agent. The dispersive solid fluid loss agent has relatively strong dispersive capacity and hydrability to cement slurry, so that the fluid loss control effect and salt tolerance of the fluid loss agent are improved, and the fluid loss control capacity of nonionic group acylamino enhanced cement slurry is improved. The dispersive solid fluid loss agent is easy to store and convenient to transport, and the slurry is easily stirred. The sedimentary stability of a slurry body is good, thixotropy does not easily occur, and the delayed coagulation side effect is avoided.

The invention discloses an early-strength low-hydration heat evolution cement paste system applicable to deepwater shallow cementation. The system is prepared from 100 parts of cement, 5-10 parts of phase-change heat absorption materials, 10-30 parts of a density reducing agent, 8-15 parts of suspension materials, 0.5-1 part of a drag reducer, 0.3-0.55 part of retarder, 0.7-1 part of a fluid loss agent, 0.7-1 part of a defoaming agent, 0.06-0.1 part of an early strength agent and 68.2-82.3 parts of water. The cement paste system has the good early strength property at low temperature, is small in hydration heat evolution amount and good in thickening property, flowing property and sedimentation stability, has right-angle thickening property and small water loss, and meets on-site construction requirements. According to the system, surface cementation in the deepwater hydrate layer can be achieved, operation time and cost can be saved, and a technical support is provided for mining of oil and gas resources in the deepwater hydrate layer.