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Neutral scale remover for gathering and transporting system and water injection system in oilfield

A technology for gathering and transportation systems and water injection systems, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as equipment metal material corrosion, equipment and personnel safety hazards, pump stuck, etc., to achieve stable operation and avoid secondary problems The effect of secondary stuck pumps or blockages

Inactive Publication Date: 2018-02-02
E TECH ENERGY TECH DEV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although pickling has a good cleaning effect, pickling will inevitably cause corrosion of metal materials and aging of non-metallic materials. At the same time, pickling has no effect on calcium sulfate scale, barium sulfate, strontium sulfate scale and silicate scale. strong limitations
Pickling also produces a large amount of carbon dioxide and hydrogen sulfide gas, which poses potential hazards to equipment and personnel safety
Large pieces of scale falling off during pickling can easily lead to secondary blockage or even pump jamming
The pickling process has a long period and will cause long-term production shutdown losses. Therefore, there are technical problems such as pickling and descaling are becoming less and less accepted by on-site production

Method used

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  • Neutral scale remover for gathering and transporting system and water injection system in oilfield
  • Neutral scale remover for gathering and transporting system and water injection system in oilfield
  • Neutral scale remover for gathering and transporting system and water injection system in oilfield

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Effect test

Embodiment 1

[0031] A kind of neutral descaling agent for oil field gathering and transportation system and water injection system, its mass percentage is composed of: the mass fraction of sodium nitrilotriacetate is 15%, the mass fraction of ethylenediamine tetramethylene phosphonate is 10%, and the mass fraction of diethyl The mass fraction of triaminepentaacetic acid is 6%, the mass fraction of tetrakis hydroxymethyl phosphorus sulfate is 5%, the mass fraction of potassium sodium tartrate is 4%, the mass fraction of ammonium citrate is 1.5%, the mass fraction of Pingpingjia AEO-9 is 0.5%, OEP- 70 mass fraction 0.2%, water mass fraction 57.8%.

[0032] The neutral descaling agent used in the oilfield gathering and transportation system and water injection system is mechanically mixed sodium triacetate, sodium ethylenediamine tetramethylene phosphonate, diethylene triamine pentaacetic acid, tetrakis hydroxymethyl phosphorus sulfate, potassium tartrate Sodium, ammonium citrate, AEO-9 and O...

Embodiment 2

[0035] A kind of neutral descaling agent for oil field gathering and transportation system and water injection system, its mass percentage is composed of: the mass fraction of sodium nitrilotriacetate is 10%, the mass fraction of ethylenediamine tetramethylene phosphonate is 15%, and the mass fraction of diethyl The mass fraction of triamine pentaacetic acid is 10%, the mass fraction of tetrakis hydroxymethyl phosphorus sulfate is 8%, the mass fraction of potassium sodium tartrate is 6%, the mass fraction of ammonium citrate is 1.5%, the mass fraction of Pingpingjia AEO-9 is 0.5%, OEP- 70 mass fraction 0.5%, water mass fraction 48.5%.

[0036] The neutral descaling agent used in the oilfield gathering and transportation system and water injection system is mechanically mixed sodium triacetate, sodium ethylenediamine tetramethylene phosphonate, diethylene triamine pentaacetic acid, tetrakis hydroxymethyl phosphorus sulfate, potassium tartrate Sodium, ammonium citrate, AEO-9 and...

Embodiment 3

[0039] Preparation and application of neutral descaling agent WCG-3355 for oilfield subsea pipeline:

[0040] Component ratio (by mass): the mass fraction of sodium nitrilotriacetate is 15%, the mass fraction of sodium ethylenediamine tetramethylene phosphonate is 10%, the mass fraction of diethylene triamine pentaacetic acid is 8%, and the mass fraction of tetrahydroxy The mass fraction of phosphorous methyl sulfate is 5%, the mass fraction of potassium sodium tartrate is 2%, the mass fraction of ammonium citrate is 1%, the mass fraction of Pinpinga AEO-9 is 0.2%, the mass fraction of OEP-70 is 0.1%, and the mass fraction of water is 58.7%.

[0041] Preparation method: mechanically mix according to the formula

[0042] Subject of the experiment: descaling of sea pipes on an offshore platform

[0043]Experimental method: Take 100ml of experimental water sample, add the same weight of on-site scale sample, see Table 1 for the analysis results of the scale sample, add different...

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Abstract

The invention relates to a neutral scale remover for a gathering and transporting system and a water injection system in oilfield, and belongs to the technical field of oilfield water treatment. The neutral scale remover for the gathering and transporting system and the water injection system in the oilfield comprises, by mass, 10-20% of sodium nitrilotriacetate, 10-20% of sodium ethylenediamine tetramethylene phosphonate, 5-15% of diethylenetriaminepentaacetic acid, 5-10% of tetrakishydroxymethylphosphonium sulfate, 2-8% of potassium sodium tartrate, 0.1-1.5% of ammonium citrate, 0.5-1.5% ofAEO-9, 0.1-1.0% of OEP-70, and the balance of water. The neutral scale remover for the gathering and transporting system and the water injection system in the oilfield has a good scale and dirt removal effect, and can quickly and effectively remove calcium carbonate, calcium sulfate, barium sulfate, silicate scales, ferrous sulfide, various corrosion products, oily sludge and other pollutants deposited in the gathering and transporting system and the water injection system. The neutral scale remover has the advantages of simple components, convenience in preparation, fastness, high efficiency,low cost, high scale removal efficiency, low dosage, harmlessness to devices, environmental protection, realization of scale removal without production stopping, and small side effects.

Description

technical field [0001] The invention belongs to the technical field of oilfield water treatment, in particular to a neutral descaling agent for oilfield gathering and transportation systems and water injection systems. Background technique [0002] At present, in oilfield gathering and transportation systems and water injection systems, because the balance of scaling ions is affected by changes in water quality, pressure, temperature, and flow rate, they will combine to form calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, and strontium sulfate. Pipeline blockage reduces the effective volume of equipment and causes serious consequences such as corrosion under scale. If the water injection treatment is not up to standard and reaches the water injection level, it will even cause formation blockage, which has brought great harm to oil field production. [0003] In the oil field production process, in order to prevent a series of problems caused by scalin...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/52
Inventor 刘智金
Owner E TECH ENERGY TECH DEV CORP
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