32results about How to "High permeability recovery value" patented technology

A low-permeability solid-free completion fluid is characterized by comprising the following components in mass percentage: 20-65% of specific gravity regulator, 1-3% of fluid loss agent, 1-2% of antiswelling agent, 0.05-0.1% of crystallization inhibitor, 0.5-1% of anti-collapse agent, 0.5-1% of corrosion inhibitor and the balance of water, wherein the specific gravity regulator is one or a combination of more than two of zinc chloride, zinc bromide, zinc iodide, zinc sulfate, zinc acetate, zinc chlorate and zinc nitrate; the fluid loss agent is carboxymethyl modified starch; the antiswelling agent is diallyl dimethyl ammonium chloride; the crystallization inhibitor is one or a combination of two of nitrilotriacetic acid and EDTA (ethylene diamine tetraacetic acid); the anti-collapse agent is nitro potassium humate; and the corrosion inhibitor is one or a combination of more than two of sodium molybdate, sodium tungstate and sodium chromate. The low-permeability solid-free completion fluid is large in specific weight, good in stability and resistant to high temperature and high pressure, can reduce the swelling rate of clay, improves the core permeability restoring value and does not generate precipitates.

The invention belongs to the technical field of petroleum drilling engineering. The invention provides a deep-water water-based drilling fluid and its application. In terms of mass percentage, it includes: 0.1% to 1.0% viscosity enhancer, 0.1% to 1.0% alkalinity adjustment Agent, 0.5%~3.5% fluid loss additive, 0.5%~1.5% low temperature flow regulator, 1.0%~5.0% shale inhibitor, 15%~25% hydrate inhibitor, 1.0%~3.0% lubricant , 5.0% ~ 10.0% temporary plugging agent and the balance of seawater. The deep-water water-based drilling fluid provided by the invention has constant rheology and reservoir protection properties.

The invention relates to a tackifying and shear strength improving agent and a preparation method thereof. The tackifying and shear strength improving agent disclosed by the invention is prepared through the steps of reacting dimeric fatty acid and polyethylene polyamine according to the molar ratio, namely 1: (0.4-1.6) of carboxyl to amino in the existence of triethylene glycol monobuthyl ether, wherein the reaction temperature is 140-160 DEG C; keeping the temperature until no water comes off, and then, further reacting for 10-20 minutes to finish the reaction; and removing water generated by the reaction while reacting. A soilless oil-based drilling fluid system with the tackifying and shear strength improving agent is good in suspension property, enhanced in solid-phase and stratum water pollution resistance, little in reservoir damage, increased in system permeability recovery value, stable in performance, strong in inhibiting property, good in lubricating property, low in plastic viscosity and high in temperature resistance up to 260 DEG C.

The invention provides a fluid loss agent for a high-temperature-resistant compound salt resistant polymer for drilling fluid and a preparation method thereof. The fluid loss agent consists of the following raw materials in percentage by weight: 10-15 percent of acrylic acid, 6-8.5 percent of sodium hydroxide, 60-65 percent of deionized water, 4-8 percent of acrylamide, 5-6 percent of tetraphenyl ethylene sodium sulfonate, 6-8 percent of N-vinyl pyrrolidone and 0.1-0.5 percent of initiator. Compared with the prior art, the fluid loss agent has the beneficial effects that the high-temperature high-pressure filter loss of the drilling fluid can be obviously reduced, and the temperature resistance and salt calcium pollution resistance of the drilling fluid system are entirely improved. Moreover, the mud cake quality is improved, a permeability recovery rate is increased, and a hydrocarbon reservoir is effectively protected. The fluid loss agent can resist high temperature of 180 DEG C and compound salts and can serve as a fluid loss agent of deep walls, drilled evaporite beds and seawater drilling.

The invention relates to a hypofluorescence film forming filtrate reducer and a preparation method thereof, which belong to the technical field of chemical engineering additive for oil drilling. The hypofluorescence film forming filtrate reducer is prepared from cotton cake powder, olefin, 1 percent of aqueous sodium hydroxide solution and span 80. The filtrate reducer has a simple production process, low manufacturing cost, good capacity for high-temperature resistance and salt resistance, hypofluorescence, nontoxicity, small filtration loss amount and good lubricating performance, can meetthe requirement of environmental protection, effectively reduces the dynamic filtration loss amount and dynamic filtration velocity, is favorable for the stability of well wall, improves oil extraction rate of perforation, prevents a drilling fluid and a filtrate from penetrating into a mud shale body, effectively prevents stratum from hydrating, expanding and collapsing, is smooth to pull out and run into holes, prevents blocking and clamping, and solves the problems that the prior filtrate reducer uses mass macromolecular materials, has high price and a complex production process, produces mass substances polluting environment, has poor capacity for resisting high temperature, salt and drill chip contamination and is not favorable for the stability of the well wall. The hypofluorescencefilm forming filtrate reducer can be used for a straight drilling well, an inclined well and a horizontal well.

The invention provides an inorganic-organic polymer processing agent for drilling fluid polymerized from sulfonic acid monomer, carboxylic acid monomer, nonionic monomer and inorganic material in the presence of initiator, and the inorganic material includes aluminium tripolyphosphate. The inorganic-organic polymer processing agent for drilling fluid has good effect on filtration reduction effect in fresh water drilling fluid, brine drilling fluid, saturated brine drilling fluid and compound brine drilling fluid. The inorganic-organic polymer processing agent for drilling fluid has strong anti-sloughing capability and high permeability recovery, can control hydration and dispersion of the shale effectively, can control mud making of the clay effectively, and has good effect on hydrocarbon reservoir protection. Moreover, the preparation method is simple, the sources of raw materials are wide, and the promotion prospect is wide. The invention also provides a preparation method of inorganic-organic polymer processing agent for drilling fluid.

The invention relates to an intelligent reservoir drilling completion fluid system. The intelligent reservoir drilling completion fluid system has strong practicability, and can be applied to different water-based drilling completion fluid systems such as drilling completion fluid systems of polymer drilling completion fluid, polysulfide drilling completion fluid, organic salt drilling completion fluid, saturated brine drilling completion fluid and the like; the system can effectively reduce the initial flow pressure of a reservoir, improve the permeability recovery value and remarkably improve the protective effect of the reservoir; and the system is simple to prepare, does not affect the normal drilling construction, can improve the protective effect of the reservoir, can effectively eliminate the time and cost for underground mud cake removing operation, and is beneficial to gaining good economic and social benefits.