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Well cementation flushing fluid for oil-based drilling fluid and preparation method and use method of well cementation flushing fluid

An oil-based drilling fluid and flushing fluid technology, applied in chemical instruments and methods, flushing wellbore, wellbore/well components, etc., can solve problems such as environmental hazards, complex cementing flushing fluid components, etc. Good rinse performance, simple formula effect

Inactive Publication Date: 2020-02-28
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the object of the present invention is to provide a cementing flushing fluid for oil-based drilling fluid and its preparation and use method, so as to solve the problem of oil-based drilling fluid cementing flushing fluid composition in the prior art. Complex technical issues with high environmental hazards

Method used

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  • Well cementation flushing fluid for oil-based drilling fluid and preparation method and use method of well cementation flushing fluid
  • Well cementation flushing fluid for oil-based drilling fluid and preparation method and use method of well cementation flushing fluid

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preparation example Construction

[0026] The present invention also provides a kind of preparation method of the cementing flushing fluid that is used for oil-based drilling fluid, comprises the following steps:

[0027] Step 1. Add the normal salt co-solvent into the water, stir with a high-speed disperser until the normal salt co-solvent dissolves, the stirring speed is 50-200rpm, and the stirring time is 10-30min, to obtain a clear solution;

[0028] Step 2. Add an acid salt co-solvent to the clear solution, stir until the acid salt co-solvent dissolves, the stirring speed is 50-200rpm, and the stirring time is 10-30min, to obtain a uniform mixed solution;

[0029] Step 3. Add nonylphenol polyoxyethylene ether non-ionic surfactant into the mixed solution, stir until uniform, the solution is milky white, the stirring speed is 200-500rpm, and the stirring time is 5-30min, to obtain component one;

[0030] Step 4. Add fatty alcohol vinyl ether nonionic surfactant to component 1, stir until the mixture is unifo...

Embodiment 1

[0033] A kind of cementing flushing fluid used for oil-based drilling fluid according to the present invention comprises fresh water: 100 parts, NP4: 2.75 parts, AEO-7: 2.75 parts, potassium carbonate: 0.5 parts and carbonic acid Sodium hydrogen: 0.5 parts; the HLB value of NP4 is 8.6-8.9, and the HLB value of AEO-7 is 12-12.5; tap water is used for fresh water.

[0034] A method for preparing a cementing flushing fluid for oil-based drilling fluid described in this embodiment comprises the following steps,

[0035] Step 1, in parts by mass, add 0.5 parts of potassium carbonate to 100 parts of tap water, stir with a high-speed disperser, and stir until potassium carbonate dissolves; wherein, the stirring speed is 100rpm, and the stirring time is 20min to obtain clarified carbonate Potassium solution;

[0036] Step 2, add 0.5 parts of sodium bicarbonate to the clarified potassium carbonate solution, stir until the sodium bicarbonate dissolves, the stirring speed is 100rpm, and...

Embodiment 2

[0041] A cementing flushing fluid used for oil-based drilling fluid according to the present invention comprises fresh water: 100 parts, NP4: 0.625 parts, AEO-7: 0.625 parts, potassium carbonate: 0.125 parts and carbonic acid Sodium hydrogen: 0.125 parts; the HLB value of NP4 is 8.6-8.9, and the HLB value of AEO-7 is 12-12.5; tap water is used for fresh water.

[0042] A method for preparing a cementing flushing fluid for oil-based drilling fluid described in this embodiment comprises the following steps,

[0043]Step 1, in parts by mass, add 0.125 parts of potassium carbonate to 100 parts of tap water, stir with a high-speed disperser, stir until potassium carbonate dissolves, the stirring rate is 50rpm, and the stirring time is 30min to obtain a clear potassium carbonate solution ;

[0044] Step 2. Add 0.125 parts of sodium bicarbonate to the clarified potassium carbonate solution, stir until the sodium bicarbonate dissolves, the stirring rate is 50 rpm, and the stirring ti...

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Abstract

The invention discloses a well cementation flushing fluid for oil-based drilling fluid as well as a preparation method and a use method of the well cementation flushing fluid. The well cementation flushing fluid comprises fresh water, a nonionic surfactant I, a nonionic surfactant II, a normal salt cosolvent and an acidic salt cosolvent, wherein the nonionic surfactant I is a fatty alcohol-polyoxyethylene ether nonionic surfactant, and the nonionic surfactant II is a nonylphenol polyoxyethylene ether nonionic surfactant; the nonionic surfactant II has good emulsifying property, and an hydrophilic base end is easily adsorbed on the surfaces of an oil-water interface, a sleeve and a well wall; the non-ionic surfactant I is used as a main agent of the flushing fluid, has good wettability, foamability, detergency and emulsifying power, has relatively high degreasing capacity, hard water resistance, is easy to biodegrade and has good compatibility; the normal salt cosolvent and the acidic salt cosolvent are used for assisting dissolution of the two nonionic surfactants, and meanwhile, the elution capacity of the well cementation flushing fluid on drilling fluid and oil-based mud cake isenhanced; safety is high, the formula is simple, cost is low, and environment friendliness is achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering oilfield chemistry, in particular to an oil-based drilling fluid cementing flushing fluid and a preparation method thereof. Background technique [0002] Due to its high viscosity and low shear rate, oil-based drilling fluid will have strong adhesion on the casing wall and well wall, thus forming a highly elastic gel-like structure. This kind of structure often turns the two interface into an oil-wet state, increases the flow consistency of cement slurry, and seriously affects the displacement efficiency of cement slurry in the cementing process. [0003] Flushing fluid is an important means to improve cementing quality. Currently, there are many kinds of oil-based drilling fluid cementing flushing fluids used at home and abroad, but the relative price is relatively high, and the composition is relatively complicated. After use, it will have a certain impact on the environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528E21B21/00
CPCC09K8/524C09K8/528E21B21/00
Inventor 吴蔓莉饶辰威徐梦媛姜鑫煜
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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