Slow-release environment-friendly acid applicable to high-temperature storage layer acidification

A reservoir and slow-release technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of large amount of acid solution and achieve the effect of low reaction rate

CN110218559AActive Publication Date: 2019-09-10SICHUAN JIEBEITONG ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-09-10

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Abstract

The invention discloses a slow-release environment-friendly acid applicable to high-temperature storage layer acidification. The slow-release environment-friendly acid comprises the following components in percentage by mass: 8-15% of an amino acid salt, 5-10% of a halogenated acid salt, 5-10% of polyaldehyde, 3-7% of an inorganic ammonium salt, 2-5% of a synergist, 0.1-0.2% of a catalyst and thebalance of water, wherein the synergist is gemini imidazoline, a gemini pyridine quaternary ammonium salt or a mixture of the two components; the catalyst is at least one of copper nitrate, cerous nitrate, cobalt nitrate or lanthanum nitrate; the amino acid salt is at least one of sodium glutamate, sodium glutamate diacetate and sodium glutamate tetraacetate; the halogenated acid salt is at leastone of sodium monochloroformate, potassium monochloroformate, sodium monochloracetate and potassium monochloracetate; and the polyaldehyde is one or two of paraformaldehyde and metaldehyde. The environment-friendly acid disclosed by the invention has the characteristics that a highest use temperature is up to 200 DEG C, the reaction velocity is low, which is about 1 / 10 of hydrochloric acid, the friction rate is low, which is about 40% of that of water, iron ions can be effectively controlled, no precipitate or residue is generated, and residual acids can be easily recycled, thus being safe andenvironment-friendly.
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Description

technical field

[0001] The invention relates to the technical field of increasing production of oil and natural gas, in particular to a high-temperature slow-release environmentally friendly acid suitable for deep acidification of high-temperature oil and gas reservoirs. Background technique

[0002] The acidizing treatment of reservoirs in oil and gas fields is mainly to decontaminate the well-entry zone and dredge new passages. However, due to the heterogeneity of the reservoir, the conventional acid liquid preferentially enters the less polluted high-permeability layer, so that it cannot reach The effect of acidizing treatment, even in homogeneous reservoirs, each layer will react unevenly with acid solution, which makes the acidizing treatment of the reservoir more difficult.

[0003] With the development of oil and gas fields, more and more high-temperature wells continue to appear. The research on acidizing technology is bound to develop towards a higher service tempe...

Examples

Embodiment 1

[0025] A high-temperature slow-release environmentally friendly acid suitable for high-temperature reservoir acidification, which consists of the following components by mass percentage:

[0026] Sodium glutamate tetraacetate 8%, sodium monochloroacetate 7%, paraformaldehyde 6%, ammonium chloride 7%, geminipyridine quaternary ammonium salt 2%, cobalt nitrate 0.1%, water 69.9%. The content amounts to 100%.

[0027] The performance test of this environmentally friendly acid was carried out at 120°C, and the results are shown in Table 1. The environmentally friendly acid of this formula is suitable for the acidification of carbonate reservoirs at 120-180°C.

Embodiment 2

[0029] A high-temperature slow-release environmentally friendly acid suitable for high-temperature reservoir acidification, which consists of the following components by mass percentage:

[0030] Sodium glutamate diacetate 10%, sodium monochloroacetate 6%, paraformaldehyde 6%, ammonium fluoride 4%, geminipyridine quaternary ammonium salt 2%, lanthanum nitrate 0.1%, water 71.9%. The content amounts to 100%.

[0031] The performance test of the environmentally friendly acid was carried out at 150°C, and the results are shown in Table 1. This formulation of environmentally friendly acid is suitable for the acidification (compression) of sandstone reservoirs at 120-180 °C.

Embodiment 3

[0033] A high-temperature slow-release environmentally friendly acid suitable for high-temperature reservoir acidification, which consists of the following components by mass percentage: sodium glutamate diacetate 15%, sodium monochloroformate 6%, paraformaldehyde 8%, ammonium chloride 3% %, Gemini pyridinium quaternary ammonium salt 5%, Cerium nitrate 0.1%, Water 62.9%. The content amounts to 100%.

[0034] The performance test of this environmentally friendly acid was carried out at 200°C, and the results are shown in Table 1. This formulation of environmentally friendly acid is suitable for the acidification (compression) of sandstone reservoirs at 180-200 °C.

[0035] Table 1, the performance test results of the environmentally friendly acids of Examples 1-3 at 120°C, 150°C, and 200°C respectively

[0036]

[0037]