31results about How to "High permeability recovery value" patented technology

The invention provides a positively charged water-based production well treatment fluid system, which is equipped with a cationic fluid loss reducer while using a cationic viscosifier, and is optionally equipped with a positively charged production well treatment fluid Slurry compounding agent, electrical stabilizer, colloidal stabilizer, lubricant, oil reservoir protection agent and / or weighting agent make the production well treatment fluid system positively charged, and this positively charged production well treatment fluid can well solve the " To deal with the contradiction between "fluid stability" and "wellbore stability", it has the characteristics of strong ability to inhibit clay dispersion, good effect of protecting oil and gas layers, fast drilling speed, regular wellbore, and good salt resistance. The present invention also relates to the preparation method of the production well treatment fluid system and its use as drilling fluid and well completion fluid for oil drilling and well completion.

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 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.

The invention belongs to the technical field of petroleum drilling engineering, and provides a deepwater water based drilling fluid and applications thereof. The drilling fluid comprises following components in percentage by weight: 0.1 to 1.0% of tackifier, 0.1 to 1.0% of alkalinity adjusting agent, 0.5 to 3.5% of filtration loss reducer, 0.5 to 1.5% of low temperature flow pattern adjuster, 1.0to 5.0% of shale inhibitor, 15 to 25% of hydrate inhibitor, 1.0 to 3.0% of lubricant, 5.0 to 10.0% of temporary blocking agent, and the balance being seawater. The provided deepwater water based drilling fluid has a constant rheological property and a reservoir protecting performance.

The invention relates to a multifunctional type high-temperature-resistant composite well control fluid. The well control fluid comprises the following components in parts by weight (the weight part sum of all components is 100): 3-5 parts of quaternary ammonium salt cationic polymer, 1-3 parts of thickener, 2-4 parts of high-temperature-resistant leak-off agent, 15-60 parts of density modifier, 1-3 parts of auxiliaries, and the balance of water. The invention further provides a preparation method of the multifunctional type high-temperature-resistant composite well control fluid. Research findings prove that the well control fluid has multiple excellent effects, can be used for petroleum exploration and development, and has good industrial application potential and market values in industry.

The invention provides oil-in-water drilling fluid taking biodiesel as a dispersion phase as well as a preparation method and application thereof. The oil-in-water drilling fluid comprises 40-70 parts by volume of water and 30-60 parts by volume of biodiesel, wherein the total volume of water and biodiesel is 100%; the oil-in-water drilling fluid further comprises the following components: bentonite with the mass-to-volume ratio (g / mL) of 1%-6%, sodium carbonate with the mass-to-volume ratio of 0.05%-0.3%, sodium hydroxide with the mass-to-volume ratio of 0.02%-0.05%, a main emulsifier with the mass-to-volume ratio of 2%-5%, an auxiliary emulsifier with the mass-to-volume ratio of 0.2%-1%, a shale inhibitor with the mass-to-volume ratio of 0.5%-5% and a filtrate reducer with the mass-to-volume ratio of 0.5%-5%. The oil-in-water drilling fluid provided by the invention has the characteristics of being low in cost, non-toxic, non-fluorescent, low in density, adjustable, good in rheological property, low in filter loss, excellent in lubricating property and high in upper temperature resistance limit, and further has advantages of being excellent in antifouling property, shale inhibition property, reservoir protection property and environment acceptability.

The invention provides an inorganic-organic polymer treatment agent for drilling fluid, wherein the treatment agent is formed by polymerization of sulfonic acid monomers, carboxylic acid monomers, nonionic monomers and inorganic materials under the action of an initiator; And the inorganic material includes aluminum magnesium silicate inorganic gel. The inorganic-organic polymer treatment agent provided by the invention has strong fluid loss reducing effect in freshwater drilling fluid, brine drilling fluid, saturated brine drilling fluid and composite brine drilling fluid. It also has a strong anti-collapse ability, can effectively control the hydration and dispersion of mud shale, control clay slurry, and has a high permeability recovery value, which has a good oil and gas layer protection effect. Moreover, the production process is simple, the source of raw materials is wide, and the promotion prospect is broad. The invention also provides a preparation method of an inorganic-organic polymer treatment agent for drilling fluid.

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 an inorganic-organic polymer treating agent used for drilling fluid. The treating agent is prepared from a sulfonic acid monomer, a carboxylic acid monomer, a non-ionic monomer and an inorganic material by polymerization under the action of an initiator, wherein the inorganic material contains lithium magnesium silicate inorganic gel. The inorganic-organic polymer treating agent provided by the invention has strong effect of reducing filtrate loss in fresh-water drilling fluid, saltwater drilling fluid, saturated saltwater drilling fluid and compound saltwater drilling fluid. The treating agent also has strong anti-sloughing ability, can effectively control hydration dispersion of clay-shale and slurry making of clay, and has high permeability recovery rate and good hydrocarbon reservoir protection effects. Meanwhile, the treating agent has the advantages of simple production process, wide raw material sources and extensive popularization prospects. The invention also provides a preparation method for the inorganic-organic polymer treating agent used for the drilling fluid.

The invention is a recycled solidfree micro-foam drilling fluid or a completion fluid, which comprises the following components in parts by weight: 1. 2-3 parts of recycled solidfree micro-foam composite treatment agent SD-LNA; 2. 0.5-1 part of low-density solidfree tackifier SD-LNV; 3 0.5-1 part of low-density modifier SD-LFD; 4. 0.5-1 part of low-density foam stabilizer SD-LFS; 5. 0.5-1 of low-density flow type modifier SD-LFR; and 6. 100 parts of water. According to a normal preparation method, the above substances are added into water successively, mixed and stirred evenly under normal temperature and normal pressure. The invention has the advantages of low density, high viscosity, small low fluid loss, good lubricating property, strong landwaste suspension property, easy maintenance, fine cleaning capability of wells, fine inhibitory capability on clay and shale, no micro-foam convergence, recycled use and the like, can be widely applied in engineering such as petroleum, geologic drilling and the like, is particularly applicable to construction technology of well drilling and well completion of low-pressure reservoir and exhausted reservoir.

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 circular screen completion method is applied to the completion of screens in oil and gas wells. Its features are: A. Run the screen completion string into the wellbore; B. Inject drilling fluid; C. Throwing balls to suppress pressure and seat seal expansion type screen hanger; D, throwing the ball to suppress pressure, open the channel between the drill string and the screen string; E, inject drilling fluid, and flush the inner wall of the screen string; F, pull out the screen completion string, and complete the Circulating screen completion operations. The effect is that the completion of the well with the screen suspended can be realized by using the circular screen completion method. It breaks the traditional practice of screen pipe suspension construction. During the construction process, the drilling fluid can be circulated at any time to minimize the damage to the oil layer during drilling, maximize the recovery value of the oil layer permeability, and increase the recovery rate; compared with the conventional screen completion method, only through Running a construction pipe string into the well can complete the suspension completion of the circulating screen pipe, improve the completion efficiency and save construction costs.

The invention relates to the field of drilling fluid during a petroleum and natural gas exploration and development process, and discloses clay-free drilling fluid for protecting a low-permeability reservoir as well as a preparation method and application thereof. The clay-free drilling fluid is prepared from hydrophobic associative polyacrylamide, a nano membrane-structure reservoir protective agent, a water blocking preventive, potassium formate, sulfonated bitumen, sulfonated walchowite, polymeric alcohol and water, wherein the water blocking preventive is N-perfluoroalkyl sulfonyl propyl triethoxysilane; the hydrophobic associative polyacrylamide comprises a structural unit as shown in a formula (1) which is shown in the description and a structural unit as shown in a formula (2) whichis shown in the description; the nano membrane-structure reservoir protective comprises a montmorillonoid sheet layer, a structural unit as shown in a formula (3) which is shown in the description and a structural unit as shown in a formula (4) which is shown in the description. According to the clay-free drilling fluid disclosed by the invention, a reservoir protection effect of a system is obvious because of no addition of proportioning bentonite particles, and the return permeability is greater than 95 percent. The formulas are shown in the description.

The invention discloses a flushing fluid of relieving damage of low permeable sandstone air layer drilling fluid and a preparation method thereof. The flushing fluid comprises 0.05-0.1 percent of surface active agent by weight percent, 8-10 percent of organic solvent chloroform by weight percent, 5.0-6.0 percent of potassium formate by weight percent, 0.6-0.8 percent of oxydol by weight percent, 0.5-0.8 percent of hydrofluoric acid by weight percent, and the balance of water. The flushing fluid can allow low permeable sandstone gas pool to become weak hydrophilic from strong hydrophilic, eliminates reservoir capillary force, resolves solid phase of an entering part, break blockade, improves efficiency of gas-drive water, and lowers the solid phase damage, and therefore, the permeability and the recovery rate of core is obviously improved.

The invention provides an inorganic-organic polymer treatment agent for drilling fluid, wherein the treatment agent is formed by polymerization of sulfonic acid monomers, carboxylic acid monomers, nonionic monomers and inorganic materials under the action of an initiator; And the inorganic material includes bentonite. The inorganic-organic polymer treatment agent provided by the invention has strong fluid loss reducing effect in freshwater drilling fluid, brine drilling fluid, saturated brine drilling fluid and composite brine drilling fluid. It also has a strong anti-collapse ability, can effectively control the hydration and dispersion of mud shale, control clay slurry, and has a high permeability recovery value, which has a good oil and gas layer protection effect. Moreover, the production process is simple, the source of raw materials is wide, and the promotion prospect is broad. The invention also provides a preparation method of an inorganic-organic polymer treatment agent for drilling fluid.

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.

The invention relates to a treating agent for a zwitter-ion inorganic-organic monomer polymer drilling fluid and a preparation method of the treating agent, and belongs to the technical field of synthesis and preparation of a water-soluble polymer material. The preparation method comprises the following steps: adopting carboxylic acid monomers A, sulfonic acid monomers B, nonionic monomers C, cationic monomers D and inorganic material monomers E as raw materials; feeding the raw materials, wherein the ratio of the amounts of substances of the carboxylic acid monomers A to the sulfonic acid monomers B to the nonionic monomers C to the cationic monomers D is (5-40):(25-10):(65-35):(5-15), and the dosage of inorganic material monomers E is 5%-25% of the total mass of the carboxylic acid monomers A, the sulfonic acid monomers B, the nonionic monomers C, the cationic monomers D and the inorganic material monomers E; adopting water as a solvent, and initiating polymerization through an oxidation-reduction initiation system to obtain the treating agent. The treating agent has higher anti-collapse ability, can effectively control hydration and dispersion of clay shale and mud making of clay, has a better hydrocarbon reservoir protection effect, and is high in permeability recovering value, simple in production technology, extensive in raw material sources and wide in popularization prospects.

The present invention provides an electropositive water-based producing well treating liquid system. A cationic anchoring agent is adopted, at the same time, a cationic fluid loss additive is added therein, optionally, a electropositive producing well treating liquid plasm matching agent, an electrical stabilizer, a deflocculating agent, a lubricant, an oil-bearing formation protecting agent and / or weighting admixture are mixed therein, causing the electropositivity of the producing well treating liquid prepared. Said electropositive producing well treating liquid can commendably resolve the contravention between 'treating liquid stability' and 'wellbore stability', have strong power for restraining clay dispersing, and is characterized by its excellent hydrocarbon reservoir protecting effect, fast well drilling velocity, well-regulated wellbores, nice salt resistance and the like. The present invention relates also to a process for producing the producing well treating liquid system and the usage thereof when being used as drilling fluid and well completion fluid in well drilling and well completion.