Blocking remover and blocking removal method for corrosion sulfate compound scale

A technology of sulfate and plugging agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of damage to the rock skeleton near the wellbore, fast reaction speed of acid rock, small treatment radius, etc. , to achieve the effects of inhibiting the formation of scale, prolonging the period of plugging removal, and inhibiting the expansion of clay

Active Publication Date: 2014-03-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the conventional acidizing construction process, due to the fast reaction speed of the acid rock and the small treatment radius, too much acid can easily damage the rock skeleton near the wellbore.
Some effective acidizing measures can only eliminate the damage in the near-wellbore area, but are difficult to work in the deep formation, and the conventional acidizing measures are basically ineffective for the sulfate scale generated due to the incompatibility of water quality

Method used

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  • Blocking remover and blocking removal method for corrosion sulfate compound scale
  • Blocking remover and blocking removal method for corrosion sulfate compound scale
  • Blocking remover and blocking removal method for corrosion sulfate compound scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh raw materials according to the following weights: (kg)

[0031] Pretreatment (consists of acid and surfactant):

[0032] 10 kilograms of methanesulfonic acid, 6 kilograms of toluenesulfonic acid, 4 kilograms of acetic acid, 10 kilograms of surfactants, 60 kilograms of water;

[0033] Among them, 30 kg of sodium heavy alkylbenzene sulfonate, 15 kg of isopropanol, 10 kg of isotridecyl alcohol polyoxyethylene ether, 2 kg of octylphenol polyoxyethylene ether, N,N'-bisoleoyl ethyl alcohol 1 kilogram of sodium diamine diethanesulfonate mixes and obtains surfactant, then chooses 10 kilograms of surfactant as the raw material of pretreatment agent.

[0034] Body fluid:

[0035] Sodium diethylenetriaminepentaacetic acid 15kg, sodium ethylenediaminetetramethylene phosphonate 8kg, disodium edetate 8kg, diethylenetriaminepentamethylenephosphonic acid 8kg, sodium acetate 2kg , 2 kg of sodium chloride, 57 kg of water;

[0036] Protective fluid:

[0037] Anti-scaling agent ...

Embodiment 2

[0058]Weigh raw materials according to the following weights: (kg)

[0059] Pretreatment (consists of acid and surfactant):

[0060] 8 kilograms of methanesulfonic acid, 4 kilograms of toluenesulfonic acid, 6 kilograms of acetic acid, 8 kilograms of surfactants, 80 kilograms of water;

[0061] Among them, 20 kg of sodium heavy alkylbenzene sulfonate, 20 kg of isopropanol, 8 kg of isotridecyl alcohol polyoxyethylene ether, 3.5 kg of octylphenol polyoxyethylene ether, N,N'-bisoleoyl ethyl alcohol Sodium diamine diethanesulfonate 0.5 kilogram mixes and obtains tensio-active agent, then chooses 8 kilograms of tensio-active agent therefrom as the raw material of pretreatment agent.

[0062] Body fluid:

[0063] Diethylenetriaminepentaacetic acid sodium 17kg, ethylenediaminetetramethylene phosphonate sodium 9kg, edetate disodium 9kg, diethylenetriaminepentamethylenephosphonic acid 9kg, sodium acetate 2kg , 2 kg of sodium chloride, 52 kg of water;

[0064] Protective fluid:

[0...

Embodiment 3

[0084] Weigh raw materials according to the following weights: (kg)

[0085] Pretreatment (consists of acid and surfactant):

[0086] 12 kilograms of methanesulfonic acid, 8 kilograms of toluenesulfonic acid, 2 kilograms of acetic acid, 12 kilograms of surfactants, 40 kilograms of water;

[0087] Among them, 40 kg of sodium heavy alkylbenzene sulfonate, 10 kg of isopropanol, 13 kg of isotridecyl alcohol polyoxyethylene ether, 1.5 kg of octylphenol polyoxyethylene ether, N,N'-bisoleoyl ethyl alcohol 1.5 kilograms of sodium diamine diethanesulfonate mixes and obtains tensio-active agent, then chooses 12 kilograms of tensio-active agents therefrom as the raw material of pretreatment agent.

[0088] Body fluid:

[0089] Sodium diethylenetriaminepentaacetic acid 19kg, sodium ethylenediaminetetramethylene phosphonate 9kg, disodium edetate 8kg, diethylenetriaminepentamethylenephosphonic acid 9kg, sodium acetate 3kg , 2 kg of sodium chloride, 50 kg of water;

[0090] Protective fl...

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Abstract

The invention discloses a blocking remover and a blocking removal method for corrosion sulfate scale. The blocking remover comprises a pretreating agent, main liquid and protective liquid. The blocking removal method comprises the following steps: firstly, adding the pretreating agent after completely washing a shaft, performing shut-in reaction for 2 hours, then, performing backwashing on the shaft with high flow rate, and further squeezing the main liquid of the blocking remover according to the flow rate of 300-500L/min; next, squeezing the protective liquid after squeezing all the main liquid, performing shut-in reaction for 24 hours, and observing pressure variation; finally, completing and injecting. The blocking remover and the blocking removal method can solve blocking caused by organics, such as colloid and asphaltene, and blocking caused by calcium scale, in the shaft and the near-shaft area, can unblock the shaft and ground channels, simultaneously, clear barium and strontium sulfate/calcium sulfate mixed scale which is difficult to remove by the conventional methods, further restrain generation of scale and clay expansion, and prolong the blocking removal cycle.

Description

technical field [0001] The invention relates to the field of oilfield chemical additives, in particular to a plugging agent and a plugging removal method for sulphate composite scales in water injection well formations of dissolved oilfields. Background technique [0002] As an effective development method, water flooding plays a vital role in the stable production of low permeability oilfields. Due to the lack of water resources in some oil fields located in the Shaanxi-Gansu-Ningxia Basin, the underground is the Cretaceous, and the Luohe layer is the only large water source, but the injected water is rich in SO 4 2- ions, and the high concentration of Ca in formation water 2+ 、Ba 2+ / Sr 2+ When they meet, it is easy to form insoluble sulfate-type scale. Once the scale is formed, the reservoir is easily damaged and it is difficult to recover, resulting in formation blockage, increased water injection pressure, and reduced water injection efficiency, which will bring gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/524E21B37/06
CPCC09K8/524C09K8/528E21B37/06
Inventor 刘宁杨全安曾亚勤唐泽玮何治武李宁军杨会丽董俊王小勇周佩
Owner PETROCHINA CO LTD
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