Oil well pollution-free paraffin removing and viscosity reducing agent

A non-polluting, viscosity-reducing agent technology, used in water injection and increasing injection, oil well pollution-free wax removal, formulation and preparation of viscosity-reducing agent, and oil well production field, can solve problems such as toxicity, flammability, and harm to construction workers.

Active Publication Date: 2011-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of them are toxic and flammable to a certain extent, causing harm to construction personnel. At the same time, storage and transportation are extremely unsafe; when decontaminating near the water injection well, acidification and fracturing are often used to solve the problem, but the validity period is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Oil well pollution-free wax remover and viscosity reducer, the weight percentage of each component is:

[0047] FR-1 complex bacteria: 21%;

[0048] Clostridium: 24%;

[0049] AD-4 microbial strains: 13%;

[0050] S-acetamidomethyl-N-tert-butoxycarbonyl-L-cysteine: 0.0003%;

[0051] Sodium nitrite: 0.6%;

[0052] Ammonium dihydrogen phosphate: 0.33%;

[0053] Vitamin A: 0.18%;

[0054] Water: 40.8897%.

[0055] Preparation method: FR-1 composite bacteria, Clostridium, AD-4 microbial strains, S-acetamidomethyl-N-tert-butoxycarbonyl-L-cysteine, and ammonium dihydrogen phosphate are proportionally Add the enamel reaction kettle; slowly raise the temperature to 30-35°C, and keep stirring for 30 minutes, then stop stirring; after cultivating for 24 hours, add sodium nitrite, ammonium dihydrogen phosphate, and vitamin A in proportion, stir while adding, and heat for 30 minutes After 10 minutes, add water in proportion, stir for 30 minutes, and discharge to obtain oil w...

Embodiment 2

[0062] Oil well pollution-free wax remover and viscosity reducer, the weight percentage of each component is:

[0063] FR-1 complex bacteria: 24%;

[0064] Clostridium: 21%;

[0065] AD-4 microbial strains: 15%;

[0066] S-acetamidomethyl-N-tert-butoxycarbonyl-L-cysteine: 0.0004%;

[0067] Sodium nitrite: 0.9%;

[0068] Ammonium dihydrogen phosphate: 0.31%;

[0069] Vitamin A: 0.25%;

[0070]Water: 38.5396%.

[0071] After the trial in more than 10 oil wells, the oil well hot washing cycle was extended from the original 60 days to 130 days. After the trial in 3 water injection wells, the wellhead injection pressure decreased by an average of 5.06 percentage points.

[0072] Comparison of application effects in more than 10 oil wells

[0073]

Oil Well Crude Properties

Average well wash cycle before application

(sky)

Average well cleaning cycle after application

(sky)

Wax content 15%-20%, containing

Water 30%-60%

...

Embodiment 3

[0077] Oil well pollution-free wax remover and viscosity reducer, the weight percentage of each component is:

[0078] FR-1 complex bacteria: 26%;

[0079] Clostridium: 18%;

[0080] AD-4 microbial strains: 17%;

[0081] S-acetamidomethyl-N-tert-butoxycarbonyl-L-cysteine: 0.0003%;

[0082] Sodium nitrite: 1.1%;

[0083] Ammonium dihydrogen phosphate: 0.29%;

[0084] Vitamin A: 0.3%;

[0085] Water: 37.3997%.

[0086] After trial use in more than 10 oil wells, the oil well hot washing cycle was extended from the original 60 days to 150 days. After trial use in 3 water injection wells, the wellhead injection pressure decreased by an average of 6.03 percentage points.

[0087] Comparison of application effects in more than 10 oil wells

[0088]

Oil Well Crude Properties

Average well wash cycle before application

(sky)

Average well cleaning cycle after application

(sky)

Wax content 15%-20%, containing

Water 60%-80%

...

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PUM

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Abstract

The invention relates to an oil well pollution-free paraffin removing and viscosity reducing agent which is applicable to oil extraction and water injection of petroleum. The invention is characterized in that the oil well pollution-free paraffin removing and viscosity reducing agent comprises the following ingredients according to weight percentage: 20-30% of FR-1 compound bacteria, 10-24% of clostridium, 12-23% of AD-4 microbial bacteria, 0.0001-0.0005% of S-acetaminomethyl-N-tertbutoxycarbonyl-L-cysteine, 0.5-1.5% of sodium nitrite, 0.2-0.35% of monoammonium phosphate, 0.1-0.35% of VitaminA, and the allowance of water. The invention has the effects that the oil well pollution-free paraffin removing and viscosity reducing agent meets the production requirement of oil well paraffin removing and viscosity reducing by the even addition of 0.01-0.03%. 0.1-0.3% of the oil well pollution-free paraffin removing and viscosity reducing agent is evenly added into water, so as to release pollution near an input well, thereby reducing the wellhead pressure of the input well by 4-10 percentage points.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, in particular to oil well recovery and water injection enhancement, and is a formula for oil well pollution-free wax removal and viscosity reducer and a preparation method thereof. Background technique [0002] At present, chemical methods are widely used in oilfields for wax removal and viscosity reduction in waxy oil wells, and most of the wax removal and viscosity reduction agents used are solvent-based wax removal and viscosity reduction agents. These solvent-based wax removers and viscosity reducers include crude benzene (benzene and benzene homologues), diesel oil, light oil, carbon disulfide, and the like. All of them are toxic and flammable to a certain extent, causing harm to construction personnel. At the same time, storage and transportation are extremely unsafe; when decontaminating near-site water injection wells, acidification and fracturing are ofte...

Claims

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Application Information

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IPC IPC(8): C09K8/524
Inventor 付亚荣付丽霞李造吉李冬青吴泽美解宏伟蒲祥金蔡远红游靖杨中锋牛宝歧陈宝新孟威姚为有
Owner PETROCHINA CO LTD
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