96results about How to "Improve acidification effect" patented technology

The invention relates to a stratum opener agent which is applied to oilfield low permeability reservoir. The stratum opener agent comprises two parts: pre-disposal liquid and acid inhibitor system; according to the weight percentage, the pre-disposal liquid consists of solvent and surfactant as follows: 1-3% of organic solvent such as higher alcohol, 0.2-1% of non-ionized surfactant polyoxyethylene alkylolamide, 0.3-0.5% of tenthfive alkyl sulfonate, and the residual quantity of stratum water; according to the weight percentage, the acid inhibitor system comprises 5-10% of low-carbon organic acid, 1-3% of hydrofluoric acid, 0.5% of inhibitor thio-phosphate imidazoline polyoxyethylene ether, 1% of adsorption inhibitor and the residual quantity of water; the adsorption inhibitor comprises 0.5-2% of ethyl dimethylene-bi-cetyltrimethylammonium ammonium bromide, 0.2-1% of quaternary ammonium salt small kation, 2-5% of inorganic salt, 0.2% of 1,3-amine group propyl alcohol N-methyl sodium phosphate or potassium dihydrogen phosphate or sodium hexametaphosphate. The opener agent can effectively improve the seepage capability of reservoir and achieve the objects of decompression and augmented injection and improving the yielding.

The invention relates to a high-temperature acidic corrosion inhibitor, which is characterized in that the high-temperature acidic corrosion inhibitor comprises the following components in parts by weight: 100 parts of solution containing 40-50 wt% ketone-aldehyde-amine condensate, 3-15 parts of propiolic alcohol, and at least one component selected from potassium iodide, formamide, antimonous oxide and antimonous chloride (wherein potassium iodide is 3-12 parts, formamide is 8-15 parts, antimonous oxide is 3-12 parts, antimonous chloride is 3-12 parts), wherein the solution containing 40-50 wt% ketone-aldehyde-amine condensate is prepared by mixing a ketone-aldehyde-amine and an alcohol solvent of alkylphenol polyoxyethylene based on a ratio of 1: (10-15). The invention also relates to a method for preparing the high-temperature acidic corrosion inhibitor.

The invention discloses a gas self-production agent, a use of the gas self-production agent, and a self-produced gas foam acidizing method for oil wells and water wells. The gas self-production agent can produce gas in an acid environment or at an oil well bottom temperature. An active ingredient of the gas self-production agent is ammonium carbamate. The gas self-production agent has the advantages of low requirement on gas production conditions, large gas yield, simplification of foam acidizing processes for oil wells and water wells, reduction of a foam acidizing cost, and improvement of acidizing effects.

The invention relates to active mixed acid plugging removal solution applicable to a low permeability reservoir and mainly solves the problems of short period of validity and poor plugging removal and augmented injection effects when conventional mud acid and composite acid methods are adopted for plugging removal treatment on low permeability formation. The active mixed acid plugging removal solution consists of the following components in proportions according to weight percent: 9-10% of acetic acid, 5-7% of formic acid, 2%-3% of bifluorid acid ammonium, 2%-4% of boric acid, 1.0-2.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 2.0% of clay stabilizer, 0.5-1.0% of dewetting active agent and 67.0-76.5% of water. The active mixed acid plugging removal solution applicable to the low permeability reservoir can delay the reaction rate of acid rock, increase the effective operating distance of acid solution, and realize the acidification of deep formation, and simultaneously can improve the oil and water seepage characteristics and increase the water phase permeability.

The invention discloses a circulation method for recovering organic acid from organic acid lithium waste water. The circulation method is characterized in that the waste water is generated by lithium deintercalation in a lithium system polymer glue solution through organic acid; solvent and acidifying agents used for polymerization reaction of generated lithium system polymers are added into the waste water for acidifying reaction with organic acid lithium in the waste water, and the pH value of an acidifying reaction endpoint is controlled to be within 3.0-6.9; the organic acid is extracted to be recovered through the solvent, and oil phases obtained after layering are returned into the process of lithium deintercalation of the organic acid. The method can be used for using the original organic acid in a lithium system polymer glue solution lithium deintercalation unit in a circulating mode after the organic acid lithium waste water is treated and restored, meanwhile, COD in the waste water can be effectively reduced, and corrosion to equipment in the treatment process is greatly reduced; the lithium deintercalation cost in the lithium system polymer technology is effectively lowered.

The invention discloses a pressure control type intelligent production pipe column capable of injecting acid by layer selection and a production method. The production pipe column comprises an upper-section pipe column provided with an underground safety valve, a passing cable packer and an electric submersible pump, and a lower-section releasing layered pipe column provided with a releasing tool, a positioning seal, a first inserting seal, a second inserting seal and a guide screw plug; pressure control switches are arranged at a plurality of positions of the production pipe column respectively; and the production method comprises the steps of manufacturing the production pipe column, mounting the pressure control switches, putting in the releasing layered pipe column and the upper-section pipe column, remotely controlling and pressurizing, digging in turn and exploring water, acidifying at a fixed point and the like. The pressure control type intelligent production pipe column and the production method, disclosed by the invention, have the advantages that the production pipe column can work only if the releasing layered pipe column is put for one time, and an instrument or the pipe column does not need to be detached; the technical difficulty of large-inclination well layered water control and oil extracting can be effectively solved; water finding, water control, layer-adjusting production and fixed-point acidifying of different oil layers are realized through remotely controlling the pressure control switches on the ground; and the acid can effectively enter a target reservoir stratum in an acidifying process.

The invention discloses a method for detonation fracture acidizing combined operation. The method comprises the steps of optimizing detonation fracture acidizing combined operation process parameters, performing operation preparation before detonation fracture and filling a pitshaft with liquid, testing stratum absorption amount before the detonation fracture, placing a detonation fracture operation tubular column to a predetermined operation depth, performing pressurization detonation of the tubular column, performing well killing operation, detonating the fracture operation tubular column, testing the stratum absorption amount after the detonation fracture, placing an acidizing operation tubular column, performing pumping injection acid liquid slug, lifting the acidizing operation tubular column, placing an electric pump production tubular column and performing electric pump liquid drainage and well opening alkalifying neutralization, placing an electric pump production Y tubular column without a Y tubular column, performing pumping injection of acid liquid slug, placing the Y tubular column, performing electric pump liquid drainage and well opening alkalifying neutralization and the like. The method has the advantages that detonation fracture and acidizing effects can be further enhanced, the acid liquid injection capability is enhanced, the acidizing radius is expanded, crack closure is further avoided, and a physical effect is enhanced; a detonation fracture effect can be enhanced, a follow-up acidizing step is selected flexibly, and the operation step is omitted while an operation effect can be guaranteed.

The invention relates to a turning foamed acid for heterogeneous reservoir acidification. The turning foamed acid comprises, by volume, a nitrogen gas phase, 10% of hydrochloric acid, 1.5-3% of hydrofluoric acid, 2WT-60A, 2% of a corrosion inhibitor and 0.5% of citric acid. The 2WT-60A is cocoalkanoylamido propyl betaine or dodecyl dimethyl betaine. After the turning foamed acid is stirred at a stirring rate of 1000r/min for 1min, a foam half-life period is about 91min and form mass is 61.5% of the original mass. The turning foamed acid has the characteristic of self-tackifying, is free of a cross-linking agent and a gel breaker, controls a self-turning function based on a pH value, and has good diffluence performances, good retardance and high flowback performances.

The invention discloses a method for enhancing the acidification effect of oil well of offshore oil field. The method for enhancing the acidification effect of oil well of offshore oil field includesthe following steps that an oil well production pipe string is taken up; an acidification construction operation pipe string is lowered down; ground acidification equipment, a pressure pulse pluggingremoval device and a pipeline are connected, an acidification wellhead manifold valve is closed, and pressure tests of an acidification process pipeline are conducted; a displacing liquid is prepared,a mud pump wellhead manifold valve is opened, and pilot injection of the oil well is conducted; the mud pump wellhead manifold valve is closed, a wellhead manifold valve of the pressure pulse plugging removal device is opened, and an energy generator pneumatic valve is opened or closed; the mud pump wellhead manifold valve is opened, and the pumping and injection of a mud pump are conducted; circulating well cleaning operation is conducted; the mud pump wellhead manifold valve and the wellhead manifold valve of the pressure pulse plugging removal device are closed, the acidification wellheadmanifold valve is opened, and the pumping and injection of an acid liquor are conducted; the acidification wellhead manifold valve is closed, the mud pump wellhead manifold valve is opened, and the pumping and injection of the displacing liquid are conducted; the circulating well cleaning operation is conducted; and the ground acidification equipment, the pressure pulse plugging removal device andthe pipeline are disassembled.

The invention provides an even acid distribution method for acidification of a heterogeneous storage layer. The method comprises the following steps that a, after an acidification tubular column is tripped into a an oil layer bottom boundary in a well hole, high-permeation layer acidification liquid containing flocculent temporary plug materials is circulated to the middle portion of an oil layer, then a casing pipe gate is closed, the high-permeation layer acidification liquid is continuously injected into the oil layer, and the high-permeation layer acidification liquid containing the flocculent temporary plug materials is obtained by taking 0.8-1.2 m<3> of acid liquid from every meter of oil layer, adding 0.3-0.5 ton of temporary plug agent in the acid liquid on every meter of plug layer and then carrying out even mixing; b, when the pump pressure rises by 3-5 MPa, the pump car displacement is controlled, and 1.8-2.2 m<3> of acid liquid needed by low-permeation layer acidification is injected into every meter of oil layer; c, a pump is shut down for a reaction for 30-60 min; d, an oil pipe gate is opened for spraying, and residual acid is removed; and e, the oil pipe gate is opened, well washing liquid is pumped from the casing pipe gate, and a well drum is cleaned up. The problem that losses of acid liquid in conventional acidification are large is solved, and the acidification effect is effectively improved. Meanwhile, no special device or equipment is needed, and the defects that layering acidification wastes time, the cost is high, the process is complex, and accidents are likely to happen are overcome.

The invention discloses an acid liquid atomization device for deep acidification of a fractured-vuggy reservoir. The acid liquid atomization device for deep acidification of the fractured-vuggy reservoir comprises a gas path system, a liquid path system and an atomization nozzle; the gas path system comprises a gas inlet and an air compressor; the liquid path system comprises acid liquid inlets, ahigh-pressure acid-proof pump and a double-flow type Venturi tube; air is pressurized by the air compressor and then enters the gas inlet; and acid liquid is pressurized by the high-pressure acid-proof pump and then enters an annular cavity, the annular cavity is used for accumulating the acid liquid, the acid liquid in the annular cavity enters a cylindrical cavity through the acid liquid inletsformed in the wall, acid mist is formed in the cylindrical cavity as the hydrodynamic cavitation effect, the acid mist is constrained by the cylindrical cavity to form acid mist columnar fluid, the acid mist columnar fluid moves at high speed in an atomization generator and is finally sprayed out from the atomization nozzle of the atomization generator, and the atomization nozzle is directly connected with a shaft. The acid liquid atomization device for deep acidification of the fractured-vuggy reservoir has the good high temperature resistance, high pressure resistance and acid resistance, the injection displacement can be controlled through the gas path system and the liquid path system, the high acid liquid atomization rate is kept, and the acidification effect of the fractured-vuggy reservoir is improved.

The invention provides a retarding acidification system. The retarding acidification system comprises a retarding admixture, wherein the retarding admixture is synthesized through a Mannich reaction of polyethylene polyamine, formaldehyde and phosphorous acid. A multi-hydrogen acid retarding acidification system is adopted, and the molecular structure of the retarding acidification system comprises multiple phosphate groups which can provide multiple H<+>. Compared with other acidic solutions, the retarding acidification system has more excellent performance including more excellent retarding performance, longer penetration distance, lower clay corrosion rate, higher quartz corrosion rate and capability of inhibiting secondary precipitation and has the advantages of being good in corrosion inhibition and chelating property, low in viscosity and the like. The retarding acidification system further has better corrosion capability when acid liquor reaches the deep stratum, and further, the acidification effect of the high-retardancy acidification system is improved.