Resistance reducing acid used for transformation of ultra-deep well

A technology for ultra-deep wells and resistance reduction, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems that restrict the development and utilization of high-temperature deep oil and gas resources, limit the intensity of reservoir transformation, etc., and achieve the purpose of increasing construction displacement and reducing The effect of extra energy consumption and increased transformation intensity

Inactive Publication Date: 2011-06-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the hydraulic friction loss of equipment limits the strength of reservoir stimulation and greatly restricts the development and utilization of these high-temperature deep oil and gas resources.

Method used

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  • Resistance reducing acid used for transformation of ultra-deep well
  • Resistance reducing acid used for transformation of ultra-deep well
  • Resistance reducing acid used for transformation of ultra-deep well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 2.0% by weight of ethylene glycol-1,2-propanediol copolymer, 2.0% by weight of β-(N,N)-diethylamino phenyl ketone, 1.0% by weight of dodecyl trimethyl chloride Ammonium, 1.0% by weight of sodium erythorbate, 28% by weight of hydrochloric acid, and the balance being water, are equipped with a barrier-reducing acid.

[0029] The acid density is 1.14g / cm 3 , viscosity 11.4mPa.s, surface tension 28.4mN / m, 90°C static corrosion rate 3.32g / m 2 .h, iron ion stability capacity 2260mg / L, 88.9mm pipe diameter, 3.0m3 / min, friction gradient 7.85MPa / 1000m, 120 ℃, 4h no stratification, no precipitation, good thermal stability.

Embodiment 2

[0031] By 2.0% by weight of ethylene glycol-1,2-propanediol copolymer, 2.0% by weight of β-(N,N)-diethylamino phenyl ketone, 1.0% by weight of dodecyl trimethyl bromide Ammonium, 1.0% by weight of hydroxylamine hydrochloride, 28% by weight of hydrochloric acid, and the balance being water, are used to prepare a barrier acid.

[0032] The acid density is 1.14g / cm 3 , viscosity 11.8mPa.s, surface tension 27.9mN / m, 90℃ static corrosion rate 3.26g / m 2 .h, iron ion stability 2235mg / L, 88.9mm pipe diameter, 3.0m 3 / min, friction gradient 7.70MPa / 1000m, 120 ℃, 4h without delamination, no precipitation, good thermal stability.

Embodiment 3

[0034] According to 4.0% by weight of ethylene glycol-1,2-propanediol copolymer, 4.0% by weight of β-(N,N)-diethylamino phenyl ketone, 2.0% by weight of dodecyl trimethyl chloride Ammonium, 2.0% by weight of sodium erythorbate, 28% by weight of hydrochloric acid, and the balance being water, are equipped with a barrier-reducing acid.

[0035] The acid density is 1.14g / cm 3 , viscosity 26.7mPa.s, surface tension 27.1mN / m, 90℃ static corrosion rate 1.74g / m 2 .h, iron ion stability 3345mg / L, 88.9mm pipe diameter, 3.0m 3 / min, friction gradient 4.96MPa / 1000m, 120 ℃, 4h without delamination, no precipitation, good thermal stability.

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Abstract

The invention relates to resistance reducing acid used for the transformation of an ultra-deep well, in particular to the resistance reducing acid used for the acidification transformation of ultra-deep and high-temperature oil and gas wells. The resistance reducing acid comprises the following components in percentage by weight: 2.0 to 4.0 percent of ethylene glycol 1,2-propanediol copolymer, 2.0 to 4.0 percent of beta-(N,N)-diethylamino phenyl ketone, 1.0 to 2.0 percent of dodecyl trimethyl ammonium halide, 1.0 to 2.0 percent of sodium erythorbate or hydroxylamine hydrochloride, 15 to 28 percent of hydrochloric acid or a mixed acid which contains 12 to 15 percent of the hydrochloric acid and 1 to 3 percent of hydrofluoric acid, and the balance of water. By utilizing the characteristics of high fluidity and low friction of a high-molecular-weight linear polymer, an auxiliary corrosion inhibitor, a ferric ion stabilizer, a cleanup additive and the like form a resistance reducing acid system which is adapted to the acidification of the ultra-deep well so as to reduce the friction in a pump injection process in construction, reduce additional energy dissipation, contribute to improving construction displacement, increase reservoir acidification transformation dynamics and improve the yield of the oil and gas wells.

Description

Technical field [0001] The invention relates to a drag-reducing acid for acidizing reformation of oil and gas wells, in particular to a drag-reducing acid for acidizing reformation of ultra-deep and high-temperature oil and gas wells. Background technique [0002] Acidizing can effectively eliminate the damage to the reservoir during drilling and completion, and is one of the main measures to increase the production of oil and gas wells. In recent years, a number of high-temperature, ultra-deep oil and gas resources have been discovered in the eastern and central western regions of my country. Due to the deep burial, high temperature, compactness, and extremely low permeability of these resources, reservoir reconstruction (acidification or hydraulic fracturing) must be carried out to be effective. Use these oil and gas resources. Due to the high pumping friction of conventional acid fluid during acidizing construction, the energy consumption of wellbore flow is large, result...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 赵金洲陈红军郭建春方天成李勇明
Owner SOUTHWEST PETROLEUM UNIV
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