Special chelating agent for oil-gas field fracturing

A chelating agent, oil and gas field technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of scale damage to formations, and achieve the effects of reducing safety hazards, protecting formations, and reducing damage

Inactive Publication Date: 2017-07-07
陕西延长石油(集团)有限责任公司(延长油矿管理局)油气勘探公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the above-mentioned problems existing in oil and gas field fracturing fluids, chelating calcium, magnesium, barium, strontium and other elements in water through chelating agents is an effective way to solve such unfavorable factors, but currently known oil and gas field fracturing fluid systems rarely consider The impact of the reaction between fracturing fluid and formation water on the formation. Even if some oil wells use chelating agents, it is based on the research that the water used for fracturing has a high salinity and the guar gum cannot be dissolved. Therefore, it is necessary to solve the problem after the fracturing fluid system enters the formation. , due to the high temperature of the formation and the high salinity of the formation water, the damage to the formation due to the damage of the scaling caused by the destruction of the ion balance

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] (1), get 5% sodium pyrophosphate, 8% ethylenediaminetetramethylenephosphonic acid, 8% glutamic acid N,N-sodium diacetate, 13% diethylenetriacetate by mass percentage Amine pentaacetic acid (DTPA), 11% EDTA, 17% N-hydroxyethylethylamine triacetic acid, 3% diethylene triamine pentamethylidene phosphonic acid, 6% nitrilotriacetic acid, 5% ten Dialkyldimethylbenzylammonium chloride and 29% water are fully mixed and uniform to prepare a finished product of a special chelating agent for oil and gas field fracturing.

[0014] (2) Mix 200ml of fracturing water and simulated formation water to prepare a guar gum solution with a mass concentration of 0.45%, and then add 0.50% foaming agent (HK309), 0.50% drainage aid (HK101), 0.50% % clay stabilizer (HK104), 0.10% bactericide (HK103) and 0.12% soda ash to make base liquid.

[0015] (3) Divide the base fluid obtained in step (2) into two parts, each part is 200ml, one part is added with a fracturing special chelating agent with a...

Embodiment 2

[0020] (1), get 4% sodium pyrophosphate, 6% ethylenediaminetetramethylenephosphonic acid, 9% glutamic acid N,N-sodium diacetate, 11% diethylenetriacetate by mass percentage Amine pentaacetic acid (DTPA), 10% EDTA, 15% N-hydroxyethylethylamine triacetic acid, 3% diethylene triamine pentamethylidene phosphonic acid, 5% nitrilotriacetic acid, 4% ten Dialkyldimethylbenzylammonium chloride and 33% water are fully mixed and uniform to prepare a finished product of a special chelating agent for oil and gas field fracturing.

[0021] (2) Mix 200ml of fracturing water and simulated formation water to prepare a guar gum solution with a mass concentration of 0.45%, and then add 0.50% foaming agent (HK309), 0.50% drainage aid (HK101), 0.50% Clay stabilizer (HK104), 0.10% bactericide (HK103) and 0.12% soda ash were prepared as base liquid.

[0022] (3) Divide the base fluid obtained in step (2) into two parts, each part is 200ml, and one part is added with a special chelating agent for fr...

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Abstract

The invention relates to a special chelating agent for oil-gas field fracturing, which comprises the following ingredients: sodium pyrophosphate, ethylenediaminetetra, glutamic acid N,N-sodium diacetate, diethylene triamine pentoacetic acid (DTPA), EDTA (ethylene diamine tetraacetic acid), N-(2-hydroxyethyl)ethylenediaminetriaceticacid, diethylenetriaminepenta acid, nitrilotriacetic acid dodecyl dimethyl benzyl ammonium chloride, water and the like.The special chelating agent for the oil-gas field fracturing can effectively reduce a phenomenon of scaling of guanidine gel fracturing fluid, and scaling of the guanidine gel fracturing fluid and formation water and reduce a damage effect on a stratum; and the implementation and application of the special chelating agent for the fracturing has an important significance for reducing potential safety hazard in oil-gas field production, ensuring fracturing fluid quality, protecting the stratum and improving oil gas productivity.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field chemical adjuvant synthesis, and relates to a special chelating agent for oil and gas field fracturing. Background technique [0002] During the fracturing process of oil and gas fields, due to the different water quality of fracturing fluid and water, some of which are even high salinity water and fracturing flowback water, which contain calcium, magnesium, barium and other ions with high concentration and various types. , When the fracturing fluid is configured, it not only affects the performance of the fracturing fluid, but also easily forms scale, which causes damage to the formation, and also easily causes corrosion under the scale, which brings potential safety hazards to the production of oil and gas fields. On the other hand, even if the water quality of the fracturing fluid is good, after it enters the formation, due to the high salinity of the formation water and the high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90
CPCC09K8/68C09K8/905C09K2208/26
Inventor 董晓军张明王帅谢元周渝蒲阳峰罗立锦高利军
Owner 陕西延长石油(集团)有限责任公司(延长油矿管理局)油气勘探公司
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