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A cleaning fluid for removing sludge pollution from oil-based drilling fluid
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A technology of oil-based drilling fluid and cleaning fluid, which is applied in the field of oil-based drilling fluid to achieve excellent cleaning effect, simple formula and improved water wettability
Active Publication Date: 2020-03-10
PETROCHINA CO LTD
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[0004] However, how to clean the oil sludge adhering to the inner wall of the casing after well completion has not been disclosed by the prior art. It is of great significance to remove the cleaning fluid contaminated by oil-based drilling fluid sludge
Method used
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[0028] Specifically, the general structural formula of fatty alcoholpolyoxyethylene ether is RO(CH 2 CH 2 O) n H, where R is C 8 -C 10 The alkyl group, n is an integer of 6-8. On the other hand, the embodiment of the present invention also provides a method for preparing a cleaning fluid for removing sludgepollution from oil-based drilling fluid, comprising the following steps:
[0029] Add water into the reaction kettle, heat to 35-45°C (such as 35°C, 38°C, 40°C, 42°C, 45°C), add organic solvent, penetrant, and demulsifier in sequence, and stir evenly to obtain a transparent liquid. Cool to room temperature (that is, 23-27°C, such as 23°C, 24°C, 25°C, 26°C, 27°C) and discharge to obtain a cleaning solution for removing oil-based drilling fluid sludge pollution.
[0030] If the cleaning solution contains a suspending agent, add the suspending agent first, and then add the organic solvent, penetrating agent, and demulsifier in sequence.
Embodiment 1
[0033] The present embodiment provides a kind of cleaning fluid that is used for removing oil-based drilling fluid sludge pollution, and it comprises the following components by weight percentage: ethanol 10%, fatty alcohol polyoxyethylene ether 1%, fatty alcohol polyoxyethylene etherphosphate 0.5%, and the balance is water.
[0034] The preparation method of the above-mentioned cleaning solution is: according to the weight ratio of each component, water is added into the reaction kettle, heated to 35°C, and then ethanol, fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether phosphate are added in sequence , stirred evenly to obtain a transparent liquid, cooled to 23°C and discharged to obtain a cleaning solution for removing oil-based drilling fluid sludge pollution.
Embodiment 2
[0036]The present embodiment provides a kind of cleaning liquid that is used for removing oil-based drilling fluid oil sludge pollution, and it comprises the following components by weight percentage: isopropanol 8%, fatty alcohol polyoxyethylene ether 0.8%, fatty alcohol polyoxyethylene Ether phosphate 0.3%, the balance is water.
[0037] The preparation method of the above-mentioned cleaning solution is as follows: add a calculated amount of water into the reaction kettle, heat to 40°C, then add ethanol, fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene, and stir evenly to obtain a transparent liquid. Cool to 25°C and discharge to obtain a cleaning solution for removing sludge pollution from oil-based drilling fluid.
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Abstract
The invention discloses a cleaning solution used for eliminating greasy filth contamination of an oil-based drilling fluid. The cleaning solution comprises, by weight, 5 to 10% of an organic solvent, 0.5 to 1% of an osmotic agent and 0.2 to 0.5% of a de-emulsifier, with the balance being water, wherein the organic solvent is at least one selected from a group consisting of ethanol, isopropanol, glycol, and low-carbon alcoholether and derivatives thereof; the osmotic agent is fatty alcoholpolyoxyethylene ether; and the de-emulsifier is fatty alcoholpolyoxyethylene etherphosphate with a general structural formula as described in the specification, and R and n in the formula are a C12-C16 alkyl group and an integer in a range of 2 to 5, respectively. The cleaning solution used for eliminating the greasy filth contamination of the oil-based drilling fluid is simple in formula, can clean greasy filth adhered onto the inner wall of a sleeve after well completion, and is excellent in cleaning effect, simple to operate and convenient for large-scale promotion and application.
Description
technical field [0001] The invention relates to the field of oil-based drilling fluid, in particular to a cleaning fluid for removing oil sludgepollution from oil-based drilling fluid. Background technique [0002] Drilling fluid is a circulating flushing medium used in the drilling process, which has the functions of cleaning the bottom of the well, balancing the pressure of the well wall, cooling and lubricating the drill bit and drill string. Drilling fluids can be divided into water-based drilling fluids, oil-based drilling fluids and gas drilling fluids. Oil-based drilling fluids are widely used in oilfield drilling because of their high temperature resistance, salt erosion resistance, and good lubricity. However, the viscosity of oil-based drilling fluid is relatively high, and it is easy to adhere to formation particles, cementslurry and solid phase substances in drilling mud to form oil sludge. In the subsequent completion process, when the oil sludge contacts some...
Claims
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