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Scale removing and inhibiting agent for later-stage oil well with tertiary oil recovery

An anti-scaling agent and technology for oil wells, which are used in the field of oil well cleaning and anti-scaling agent and oil well cleaning and anti-scaling agent in the late stage of tertiary oil recovery. , removal or oil well scale deposition effect

Active Publication Date: 2013-02-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anti-scaling efficiency of this kind of polymer to calcium carbonate and calcium sulfate is not as good as that of organic polyphosphonic acid. Although it has anti-scaling effect on barium sulfate and strontium sulfate, the efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: the weight percentages of each component of the oil well cleaning and antiscaling agent in the later stage of tertiary oil recovery are:

[0045] 1. Hydroxypentamethylenephosphonic acid (industrial product): 15.3%;

[0046] 2. Hydrochloric acid HCl (industrial product): 3.5%;

[0047] 3. Hydrofluoric acid HF (industrial product): 3.2%;

[0048] 4. Vitamin C (industrial product): 0.05%;

[0049] 5. Phosphine-based polymaleic anhydride antifouling agent: 24%;

[0050] 6. Urotropine (industrial product): 2.5%;

[0051] 7. USP2 alkyl is pentadecyl (industrial product): 5.7%;

[0052] 8. C 12 -C 18 Fatty alcohol polyoxyethylene (10) ether (industrial product): 2.5%

[0053] 9. Sodium selenide aqueous solution with a concentration of 0.5%: 0.001%;

[0054] 10. Methanol (industrial product): 15%;

[0055] 11. Water: 28.249%.

[0056] Production method: First, mix hydroxypentamethylene phosphonic acid, phosphinopolymaleic anhydride antiscalant, C 12 -C ...

Embodiment

[0058] Embodiment: 2: the weight percentages of each component of the oil well cleaning and antiscaling agent in the later stage of tertiary oil recovery are:

[0059] 1. Hydroxypentamethylenephosphonic acid (industrial product): 15.8%;

[0060] 2. Hydrochloric acid HCl (industrial product): 3.6%;

[0061] 3. Hydrofluoric acid HF (industrial product): 3.15%;

[0062] 4. Vitamin C (industrial product): 0.052%;

[0063] 5. Phosphine-based polymaleic anhydride antifouling agent: 23.5%;

[0064] 6. Herotropine (industrial product): 2.6%;

[0065] 7. USP2 alkyl is pentadecyl (industrial product): 5.9%;

[0066] 8. C 12 -C 18 Fatty alcohol polyoxyethylene (10) ether (industrial product): 2.6%

[0067] 9. Sodium selenide aqueous solution with a concentration of 0.5%: 0.0012%;

[0068] 10. Methanol (industrial product): 16%;

[0069] 11. Water: 26.7968%.

[0070] The preparation method is the same as in Example 1. Effect: Adding 60mg of oil well annulus for every liter of pro...

Embodiment 3

[0071] Embodiment 3: the weight percentages of each component of the oil well cleaning and antiscaling agent in the later stage of tertiary oil recovery are:

[0072] 1. Hydroxypentamethylenephosphonic acid (industrial product): 16.3%;

[0073] 2. Hydrochloric acid HCl (industrial product): 3.7%;

[0074] 3. Hydrofluoric acid HF (industrial product): 3.12%;

[0075] 4. Vitamin C (industrial product): 0.055%;

[0076] 5. Phosphine-based polymaleic anhydride antiscalant agent: 22.7%;

[0077] 6. Herotropine (industrial product): 2.7%;

[0078] 7. USP2 alkyl is pentadecyl (industrial product): 6%;

[0079] 8. C 12 -C 18 Fatty alcohol polyoxyethylene (10) ether (industrial product): 2.7%

[0080] 9. Sodium selenide aqueous solution with a concentration of 0.4%: 0.0013%;

[0081] 10. Methanol (industrial product): 17%;

[0082] 11. Water is 26.7237%.

[0083] The preparation method is the same as in Example 1. Effect: Adding 75mg of oil well annulus for every liter of pr...

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Abstract

The invention relate to a scale removing and inhibiting agent for a later-stage oil well with tertiary oil recovery, which is used for removing and inhibiting the scale of the later-stage oil well with tertiary oil recovery and is characterized by comprising the following components in percentage by weight: 15.2-17.8% of hydroxy pentamethylene phosphonic acid, 3.5-4.0% of hydrochloric acid, 3.0-3.2% of hydrofluoric acid, 0.05-0.06% of vitamin C, 21.5-24% of phosphino polymaleic anhydride scale inhibitor, 2.5-3.0% of methenamine, 5.7-6.2% of USP2 with a pentadecyl, 2.5-3.0% of C12-C18 fatty alcohol polyoxyethylene (10) ether, 0. 001-0.0015% of 0.3-0.5% aqueous solution of sodium selenide, 15-20% of methanol and the balance of water, wherein all the components account for 100 percent by weight. The scale removing and inhibiting agent can be added to the later-stage oil well with tertiary oil recovery during the daily maintenance of the oil well to remove or slow down the oil well scale deposition and prolong the pump detection period, 50-75mg of scale removing and inhibiting agent is added to the oil well annulus for the recovery of 1 litter of oil from the oil well, and the pump detection period can be prolonged by 1-2 times.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, and in particular relates to an oil well cleaning and antiscaling agent in the late stage of tertiary oil recovery, which is an oil well cleaning and prevention agent for removing or slowing down the oil well scale deposition after tertiary oil recovery, and at the same time having cathodic protection for steel and prolonging the pump inspection period. detergent. Background technique [0002] Tertiary oil recovery technology is an important means to further enhance oil recovery in the late stage of high water cut in oilfields. However, with the in-depth implementation of tertiary oil recovery technology, the problem of oil well scaling has been exposed, and oil well scaling can seriously affect normal oil production. The main mineral components in oil well scale are amorphous silica, hexagonal spherical calcite, ordinary calcite and barium sulfate, etc.; the secondary minerals are detrital...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528
Inventor 付亚荣刘春平秦岭李冬青李造吉付丽霞李淼
Owner PETROCHINA CO LTD
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