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Enzymatic on-site deep acidizing fluid for oil and gas fields and application thereof

A technology of deep acidification and acidification solution, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of difficult to meet engineering conditions, short effective acid etching distance, corrosion of construction equipment, etc., to improve the acidification effect. and crude oil and natural gas recovery, improve formation permeability, avoid corrosion effect

Inactive Publication Date: 2010-09-22
DALIAN BITEOMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional acidizing method of carbonate rock is to use hydrochloric acid solution with a mass fraction of 15% to 28%. The disadvantages are: fast reaction speed of acid rock, short effective acid etching distance, generally 15 to 30 meters, and small acid etching radius. Generally 1 to 2 meters, and severely corroded construction equipment, reducing the transformation effect and economic benefits
Therefore, the etching degree and efficiency are low
It is also reported to use the copolymer of polylactic acid, polyglycolic acid, polylactic acid and polyglycolic acid to generate acid downhole, (yo John Steele etc., publication number CN1708632), but the construction conditions are harsh, and the existing projects in the same conditions are difficult to meet

Method used

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  • Enzymatic on-site deep acidizing fluid for oil and gas fields and application thereof
  • Enzymatic on-site deep acidizing fluid for oil and gas fields and application thereof
  • Enzymatic on-site deep acidizing fluid for oil and gas fields and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In situ acid corrosion test without lipase catalysis: 25% methyl lactate (36 g, 0.10 mol) was added to a 100 mL reaction flask filled with 20.00 g of anhydrous calcium carbonate (0.2 mol). The reaction mixture was heated at 100°C for 5 hours, cooled to room temperature, filtered through a pre-weighed sand core funnel, unreacted calcium carbonate was washed three times with water, drained and then dried in an oven at 110°C to constant weight. Unreacted calcium carbonate weighed 19.32g. According to the theoretical calculation, the corrosion rate is 6.7%.

Embodiment 2

[0051] Lipase catalyzed acid corrosion test in situ: add 25% methyl glycolate (36g, 0.10mol) to the 100mL reaction flask filled with 20.00g anhydrous calcium carbonate (0.2mol), then add lipase (0.002%, w / v). The reaction mixture was heated at 100°C for 4 hours, cooled to room temperature, filtered through a pre-weighed sand core funnel, unreacted calcium carbonate was washed three times with water, drained and then dried in an oven at 110°C to constant weight. Unreacted calcium carbonate weighed 12.1 g. According to the theoretical calculation, the dissolution rate is 79%.

Embodiment 3

[0053] Thermophilic lipase catalyzed acid corrosion test in situ: add 25% methyl lactate (41.6g, 0.10mol) to the 100mL reaction flask filled with 20.00g anhydrous calcium carbonate (0.2mol), then add lipase (0.002 %, w / v). The reaction mixture was heated at 100°C for 14 hours, cooled to room temperature, filtered through a pre-weighed sand core funnel, unreacted calcium carbonate was washed three times with water, drained and then dried in an oven at 110°C to constant weight. Unreacted calcium carbonate weighed 10.3 g. According to the theoretical value, the corrosion rate is 97%

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Abstract

The invention relates to biological acidification technology of carbonate rock oil and gas well matrix acidification and acid-fracturing reformation, and oil-water well inorganic carbonate scaling comprehensive de-plugging, in particular to enzymatic on-site deep acidizing fluid for oil and gas fields and application thereof. According to weight concentration, the enzymatic on-site deep acidizingfluid comprises 15 to 25 percent of organic acid ester which serves as a neutral precursor and has good water solubility, 0.005 to 0.1 percent of hydrolytic enzyme of the organic acid ester, and the balance of water. The rock core acid-etching reaction is completed in 4 to 48 hours; and results show that 5 to 20 grooves are formed on the surface of the rock core, the permeability of earth seams is improved in a large area, the acidification or acid-fracturing effect can be improved, and the enzymatic on-site deep acidizing fluid can be used for oil field carbonate rock matrix acidification oracid-fracturing and oil-water well de-plugging projects.

Description

technical field [0001] The present invention relates to carbonate oil and gas well matrix acidification and acid fracturing transformation in oilfield development, and biological acidification technology for comprehensive plugging removal of inorganic carbonate scaling in oil and water wells, specifically an enzyme-catalyzed in-situ depth Acidizing fluids and their applications. Background technique [0002] Acidizing and acid fracturing technologies are not only one of the leading technologies for increasing production and stabilizing production of carbonate reservoir development wells, but also have become an indispensable and important means for exploration wells to discover oil and gas or proven reserves. The key factors for the effects of acidizing and acid fracturing are: the effective length of acid-etched fractures and the conductivity of acid-etched fractures, and the effective length of acid-etched fractures is the key to acidizing and stimulating low-permeability ...

Claims

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Application Information

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IPC IPC(8): C09K8/72
Inventor 梅晓丹刘向阳朱晶武萍姜妍杨绪彤孙强陈朋王薇粱莹江磊磊
Owner DALIAN BITEOMICS INC
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