Efficient retarded acidification working fluid and preparation method thereof

A working fluid and retarding technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of weak corrosion, achieve easy flowback, improve core permeability performance, prolong acid The effect of rock reaction time

Inactive Publication Date: 2021-06-29
CHINA NAT OFFSHORE OIL CORP +1
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency slow acidification working fluid and its preparatio...
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Method used

As can be seen from table 3, the novel high-efficiency retarding acidification working fluid provided by the embodiment of the invention is lower than the corrosion rate of the N80 sample to the corrosion rate of the N80 sample after adding the corrosion inhibitor to the corrosion rate of the N80 test piece by the conventional soil acid acidification working fluid, And it is much smaller than the primary index value (3 to 4g·m-2·h-1) of 12%HCl+3%HF in the SY/T5405-1996 industry standard. The surface of the N80 type standard corrosion te...
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Abstract

The invention discloses an efficient retarded acidification working fluid and a preparation method thereof. Every 100 parts of the efficient retarded acidification working fluid comprises the following components in parts by mass: 10-20 parts of ammonium salt, 5-20 parts of organic phosphonic acid, 5-20 parts of hydrochloric acid, 1-6 parts of a corrosion inhibitor, 0.5-2 parts of a clay stabilizer and 0.5-2 parts of an iron ion stabilizer, with the balance being water. The preparation method of the efficient retarded acidification working fluid comprises the following steps: adding the water into the ammonium salt at normal temperature and normal pressure, and carrying out stirring and dissolving to obtain an ammonium salt solution; adding the hydrochloric acid and the organic phosphonic acid into the ammonium salt solution, and carrying out uniform stirring and mixing to obtain a retarded acid solution; and sequentially adding the corrosion inhibitor, the clay stabilizer and the iron ion stabilizer into the retarded acid solution, and carrying out uniform stirring and mixing to obtain a finished product. The efficient retarded acidification working fluid has a good corrosion effect on stratum rocks and can improve the permeability of rock cores; and the efficient retarded acidification working fluid has good slow-release property, can act on stratum rocks for a longer time, realizes deep plug removal, and is beneficial to yield increase of petroleum and natural gas reservoirs.

Application Domain

Drilling compositionBorehole/well accessories

Technology Topic

Environmental geologyCorrosion inhibitor +7

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  • Efficient retarded acidification working fluid and preparation method thereof
  • Efficient retarded acidification working fluid and preparation method thereof
  • Efficient retarded acidification working fluid and preparation method thereof

Examples

  • Experimental program(5)

Example Embodiment

[0019] Example 1:
[0020] Preparation of the first high-efficiency slow-acidizing working solution.
[0021] Set the mass of the high-efficiency slow acidifying working solution to be configured as 100 parts; under the conditions of normal temperature and pressure, first use tap water and ammonium bifluoride to prepare an ammonium salt solution with a mass fraction of 10%; then add a quantitative amount to the ammonium salt solution in turn hydrochloric acid, hydroxyethylene diphosphonic acid and ammonium bifluoride, stir and mix evenly to obtain a retarder with a mass fraction of hydrochloric acid of 12%, a mass fraction of hydroxyethylene diphosphonic acid of 15%, and a mass fraction of ammonium bifluoride of 10% acid solution; then add quantitatively self-developed Mannich base corrosion inhibitor, clay stabilizer ammonium chloride and iron ion stabilizer ethylenediaminetetraacetic acid into the retarding acid solution, stir and mix evenly to obtain a hydrochloric acid solution. The mass fraction is 12%, the mass fraction of hydroxyethylene diphosphonic acid is 15%, the mass fraction of ammonium bifluoride is 10%, the mass fraction of Mannich base corrosion inhibitor is 2%, the clay stabilizer ammonium chloride The mass fraction of 1%, the mass fraction of iron ion stabilizer ethylenediaminetetraacetic acid is 1% of the first high-efficiency slow acidification working fluid.

Example Embodiment

[0022] Example 2:
[0023] Preparation of the second high-efficiency slow-acidizing working solution.
[0024] The mass fraction of the acidifying working solution to be prepared is set to 100; under the conditions of normal temperature and pressure, tap water and ammonium fluoride are used to prepare an ammonium salt solution with a mass fraction of 15%; then hydrochloric acid and hydroxyl groups are added to the ammonium salt solution in sequence Ethylene diphosphonic acid and dihexene triamine pentamethylidene phosphonic acid (mass fraction of 1:1), stir and mix evenly to obtain hydrochloric acid with a mass fraction of 12%, hydroxyethylene diphosphonic acid and dihexyl A retarded acid solution with a mass fraction of enetriamine pentamethylene phosphonic acid of 15% and a mass fraction of ammonium fluoride of 15%; and then quantitatively self-developed quaternary ammonium salts and imidazole retarders were added to the retarded acid solution. Etching agent, clay stabilizer potassium chloride and iron ion stabilizer citric acid, stir and mix evenly to obtain a mass fraction of hydrochloric acid of 12%, a mass fraction of hydroxyethylene diphosphonic acid of 15%, and a mass fraction of ammonium fluoride. 15%, 2.5% mass fraction of quaternary ammonium salt and imidazole corrosion inhibitor, 0.5% mass fraction of clay stabilizer potassium chloride, 0.5% mass fraction of iron ion stabilizer citric acid Efficient slow acidizing working fluid.

Example Embodiment

[0025] Example 3:
[0026] Experiment on the dissolution rate of high-efficiency slow-acidizing working fluid on rock powder.
[0027] The rock powder was dried at 80 °C for 4 h, and then placed in a drying bottle and sealed for later use. The dried rock powder was taken out and weighed at room temperature, and the mass of each part was 5.0000 g. According to the dosage of 1g of rock powder acid solution, 10ml, put rock powder and different acid solutions into a wide-mouth bottle, shake to make the acid solution and rock powder fully contact, and then let stand. After drying for 6h, the filter paper and the residue were weighed. The dissolution rate of the rock powder was calculated according to the mass of the rock powder before and after the reaction, and was calculated by formula (1). The calculation results are shown in Table 1. All waste liquids in this experiment were poured into waste liquid recycling buckets for unified treatment.
[0028]
[0029] where m 1 is the initial mass of rock powder, g; m 2 is the mass of undissolved rock powder after filtration, g.
[0030] Table 1 Dissolution rate of sandstone powder by different acidizing working fluids
[0031]
[0032] As can be seen from Table 1, compared with the conventional soil acid acidizing working fluid, the two kinds of high-efficiency retarding acidizing working fluids provided in the embodiment of the present invention have a slightly lower corrosion rate to the rock powder; but after two hours of reaction, the conventional soil acid acidizing The dissolution rate of the working fluid to the rock powder almost no longer increases with the prolongation of the reaction time; the dissolution rate of the high-efficiency slow acidizing working fluid provided by the embodiment of the present invention to the rock powder continues to increase with the prolongation of the reaction time, indicating that this The high-efficiency slow-acidizing working fluid provided by the embodiment of the invention can act on the formation rock for a longer time, effectively avoiding the shortcoming that the acid solution has a short acting distance due to the excessive reaction between the conventional soil acid acidizing working fluid and the formation rock, and cannot realize deep plugging removal. .
[0033] like figure 1 As shown, the dissolution rate curves of two types of high-efficiency slow-acidizing working fluids to rock powder in this example. It can be seen from the graph that the dissolution rate of the high-efficiency retarded acidifying working fluid provided in the embodiment of the present invention to rock powder increases significantly with the prolongation of the reaction time, indicating that with the continuous progress of the reaction, the high-efficiency retardation provided by the embodiment of the present invention is effective. The fast acidizing working fluid can continuously release H + , continuously and effectively dissolve formation rocks, and achieve deep plugging removal.

PUM

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Description & Claims & Application Information

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