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Gelled acid for acid fracturing stimulation measures of oil-gas reservoir

A technology of gelled acid and oil and gas reservoirs, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problems of excessive residues and too fast reaction speed of acid rocks, and achieve simple preparation, improved conductivity, and performance stable effect

Active Publication Date: 2016-08-10
PETRO KING OILFIELD TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-damage, high-efficiency slow-speed gelling acid for oil and gas reservoir acid fracturing stimulation measures to solve the problem of too fast acid-rock reaction speed and more residues in the acid fracturing working fluid in the prior art question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]To prepare 100mL of gelling acid, mix 0.6g of thickener (copolymer of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide at a ratio of 1:8), 0.3mL of corrosion inhibitor (per 100mL of corrosion inhibitor containing 30g hydroxyquinoline and 10g benzyl chloride), 1mL disodium edetate, 0.8mL drainage aid (18mL propylene glycol block polyether per 100mL drainage aid), 0.8mL foaming agent (each 100mL of foaming agent contains 20mL of dodecyltrimethylammonium chloride, 15mL of dodecyldimethylamine oxide, 5mL of methanol, 0.5mL of fluorocarbon surfactant) and 20mL of concentrated hydrochloric acid dissolved in an appropriate amount of water to obtain 100mL of gelling acid. Wherein, the acid-dissolving time of the thickener is 15 minutes.

[0036] Project case:

[0037] Well AZ-02 in the Middle East is a directional well, a development well, the construction well section is 2563.3m~2637.5m, using the gelled acid of this embodiment, and pumping acid liquid for 370m 3 , c...

Embodiment 2

[0039] To prepare 100mL of gelling acid, mix 0.5g of thickener (a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and acrylamide at a ratio of 1:10), 0.5mL of corrosion inhibitor (per 100mL of corrosion inhibitor containing 25g hydroxyquinoline and 12g benzyl chloride), 1mL disodium edetate, 0.5mL drainage aid (20mL propylene glycol block polyether per 100mL drainage aid), 0.5mL foaming agent (each 100mL of foaming agent contains 20mL of dodecyltrimethylammonium chloride, 18mL of dodecyldimethylamine oxide, 8mL of methanol, 0.6mL of fluorocarbon surfactant) and 15mL of concentrated hydrochloric acid dissolved in an appropriate amount of water to obtain 100mL of gelling acid. Wherein, the acid-dissolving time of the thickener is 15 minutes.

[0040] Project case:

[0041] Well AZ-04 in the Middle East, directional well, development oil well, construction well section 2701.7m ~ 2773.8m, using the gelled acid of this embodiment, pumping acid liquid 360m 3 , construction...

Embodiment 3

[0043] To prepare 100mL of gelling acid, mix 0.7g of thickener (a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and acrylamide at a ratio of 1:6), 0.2mL of corrosion inhibitor (per 100mL of corrosion inhibitor containing 35g hydroxyquinoline and 8g benzyl chloride), 1mL disodium edetate, 1mL drainage aid (15mL propylene glycol block polyether per 100mL drainage aid), 1mL foaming agent (every 100mL The foaming agent contains 18mL of dodecyltrimethylammonium chloride, 12mL of dodecyldimethylamine oxide, 3mL of methanol, 0.3mL of fluorocarbon surfactant) and 25mL of concentrated hydrochloric acid dissolved in an appropriate amount of water to obtain 100mL of Gelling acid. Wherein, the acid-dissolving time of the thickener is 17 minutes.

[0044] Project case:

[0045] Well AZ-06 in the Middle East is a directional well, a development well, the construction well section is 2613.8m ~ 2722.4m, using the gelled acid of this example, pumping acid liquid 375m 3 , constructi...

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Abstract

The invention relates to a gelled acid for acid fracturing stimulation measures of an oil-gas reservoir. The gelled acid can be applied to cid fracturing stimulation measures of a medium-high temperature carbonate reservoir and has excellent acid-rock reaction retarding property, and filtration reduction property; the flow conductivity of an acid corrosion fracture and the penetration distance of an acid liquid can be effectively improved; deep penetration of the acid liquid can be effectively achieved; a remote reservoir is communicated to reach the target of deep acid fracturing transformation; meanwhile, the gelled acid generates a small amount of residues after acid fracturing; the secondary harm caused by the reservoir is extremely low; meanwhile, the acid liquid system is stable in performance; and field preparation is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a gelled acid used in oil and gas reservoir acid fracturing stimulation measures. Background technique [0002] The acidic working fluid used in the acidizing and fracturing operations of oil and gas reservoirs squeezes the working fluid into the formation through the ground high-pressure pumping equipment, breaks the formation to form cracks, the working fluid enters the formation, and then reacts with the formation rock, and the acid solution dissolves the formation. The dissolution wormholes are formed, so as to increase the reservoir permeability, oil (gas) drainage channels, and finally achieve the purpose of increasing production. [0003] As the development of oil and gas fields enters the middle and later stages, there are fewer and fewer wells with natural productivity, and the development difficulty is becoming more and more difficult. For oil and gas wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/882C09K2208/32
Inventor 王金龙赵锦栋林景禹孙雪猛伍嘉
Owner PETRO KING OILFIELD TECH
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