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Foam washing fluid and preparation method thereof

A technology of well flushing fluid and foam is applied in the formulation and preparation field of foam well flushing fluid, which can solve the problems of poor quality of two-interface bonding and achieve the effect of eliminating pollution

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

It mainly solves the problem of poor bonding quality of the two interfaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: the weight ratio of each component of foam well washing fluid is:

[0046] 1. Cetyl-octadecyltrimethylammonium chloride (161831) (industrial product): 3.6%;

[0047] 2. Thiol polyoxyethylene ether SSA-80 (industrial product): 19%;

[0048] 3. Polyoxyethylene (10) octylphenol ether (OPE-10) (industrial product): 12%;

[0049] 4. Potassium chloride (industrial product): 1.8%;

[0050]5. Fluorocarbon surfactant FC-3B (industrial product): 0.08%;

[0051] 6. Vitamin A (industrial product): 0.66%;

[0052] 7. Fluorocarbon surfactant FN-3 (industrial product): 0.05%;

[0053] 8. Water: 62.81%.

[0054] Effect: Adding 0.5% foam well flushing fluid to oil well flushing fluid, the recovery period of oil well production after hot washing is shortened from 5 days to 2 days when no foam flushing fluid is added, and the recovery period is shortened by 60 percentage points.

Embodiment 2

[0055] Embodiment 2: the weight ratio of each component of foam well washing fluid is:

[0056] 1. Cetyl-octadecyltrimethylammonium chloride (161831): 3.8%;

[0057] 2. Thiol polyoxyethylene ether SSA-80: 20%;

[0058] 3. Polyoxyethylene (10) octylphenol ether (OPE-10): 11%;

[0059] 4. Potassium chloride: 1.1%;

[0060] 5. Fluorocarbon surfactant FC-3B: 0.07%;

[0061] 6. Vitamin A: 0.69%;

[0062] 7. Fluorocarbon surfactant FN-3: 0.06%;

[0063] 8. Water: 63.28%.

[0064] Effect: Adding 0.65% foam well flushing fluid to oil well flushing fluid, the recovery period of oil well production after thermal washing is shortened from 10 days to 6 days when no foam flushing fluid is added, and the recovery period is shortened by 40 percentage points.

Embodiment 3

[0065] Embodiment 3: the weight ratio of each component of foam well washing fluid is:

[0066] 1. Cetyl-octadecyltrimethylammonium chloride (161831) (industrial product): 4.2%;

[0067] 2. Thiol polyoxyethylene ether SSA-80 (industrial product): 24%;

[0068] 3. Polyoxyethylene (10) octylphenol ether (OPE-10) (industrial product): 10%;

[0069] 4. Potassium chloride (industrial product): 1.3%;

[0070] 5. Fluorocarbon surfactant FC-3B (industrial product): 0.08%;

[0071] 6. Vitamin A (industrial product): 0.7%;

[0072] 7. Fluorocarbon surfactant FN-3 (industrial product): 0.08%;

[0073] 8. Water: 59.64%.

[0074] Effect: Adding 1.0% foam well flushing fluid to the oil well flushing fluid, the recovery period of the oil well output after thermal washing is shortened from 8 days to 5 days when the foam well flushing fluid is not added, and the recovery period is shortened by 37.5 percentage points.

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PUM

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Abstract

The invention relates to foam washing fluid, which is applied to an oilfield development and washing work process. The foam washing fluid is characterized by comprising the following components by weight: 3.5 to 6 percent of hexadecyl-octadecyl trimethyl ammonium chloride, 18 to 30 percent of thioalcohol polyoxyethylene ether SSA-80, 8 to 12 percent of polyoxyethylene (10) octyl phenol ether, 1 to 2 percent of potassium chloride, 0.05 to 0.1 percent of fluorocarbon surfactant FC-3B, 0.5 to 1 percent of vitamin A, 0.05 to 0.1 percent of fluorocarbon surfactant FN-3, and the balance of water. The foam washing fluid has the effects that: when an oil well is thermally washed, the foam washing fluid is added into well washing fluid, and the oil well does not generate well killing phenomenon; and when a water injection well is washed, the foam washing fluid is evenly added into injection fluid, then dead oil in a shaft can be thoroughly washed out, and simultaneously, the aim of eliminatingthe pollution of a near wellbore zone is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, in particular to a treatment agent for oil field development and well washing operations, which is a formula of foam well washing fluid and a preparation method thereof. Background technique [0002] In the process of oil field development, it is often necessary to perform well washing operations on oil wells. After the low-permeability oil well is hot-washed, due to the pollution of the oil layer by the well-washing fluid, the production of the oil well will decrease or even the phenomenon of no fluid will often occur. In addition, for water injection wells, since the injected water contains a certain concentration of crude oil, although the amount is small, as the water injection time prolongs, some crude oil adheres to the inner wall of the tubing, the outer wall of the tubing, or the inner wall of the casing, and pollutes the area near the well, becoming " de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
Inventor 付亚荣吴泽美李造吉付丽霞李冬青付森解宏伟蒲祥金蔡远红游靖杨中峰牛宝歧陈宝新孟威姚为有
Owner PETROCHINA CO LTD
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