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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 preparation method to solve the technical problem of preparing unconventional acid fluid with deep penetration ability and weak corrosion

Method used

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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
Comparison scheme
Effect test

Embodiment 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 frac...

Embodiment 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 ...

Embodiment 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 ...

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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.

Description

technical field [0001] The invention relates to the technical field of working fluid system formulations in the process of acidification and acid pressure stimulation measures for oil and natural gas exploitation, in particular to a high-efficiency slow-acidizing working fluid and a preparation method thereof. Background technique [0002] In the process of oil and gas exploitation, in order to obtain higher oil and gas production, the method of acidizing and acid fracturing the formation is usually adopted. Clear the bottom hole pollution of production wells and water injection wells and restore formation permeability; or use acid solution to dissolve formation rock cement, improve formation permeability, and increase the conductivity of pores and fractures, so as to increase production of oil and gas wells and increase injection of water injection wells. To achieve the purpose of increasing oil and gas production. [0003] At present, the acidification of sandstone reserv...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/52C09K8/54
CPCC09K8/74C09K8/52C09K8/54C09K2208/12C09K2208/32
Inventor 刘义刚刘长龙高尚符扬洋朱艳华孟祥海邹剑张丽平张璐代磊阳兰夕堂
Owner CHINA NAT OFFSHORE OIL CORP
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