Oil-based spacer fluid for well cementation and cementing and preparation method thereof

A technology of cementing and spacer fluid, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low success rate, complicated cementing and cementing construction, etc.

Active Publication Date: 2021-02-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides an oil-based spacer fluid for well cementing and injection and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of complex cementing and injection in oil-based drilling fluid environment and low success rate The problem

Method used

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  • Oil-based spacer fluid for well cementation and cementing and preparation method thereof

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Embodiment 1

[0020] Embodiment 1: The oil-based spacer fluid for well cementing and cementing, the raw materials include 20 to 160 parts of weighting material, 10 to 20 parts of wetting agent, 5 to 22 parts of organic soil, and 50 parts of oil in terms of parts by weight. to 95 parts, 2 to 8 parts of suspending agent, 2 to 5 parts of dispersant, 5 to 6 parts of polymer fluid loss reducer, 10 to 25 parts of emulsifier and 6 to 21 parts of water, according to the following The above steps are obtained: in the first step, the required amount of water is added to the reactor; in the second step, the required amount of suspending agent is added to the water, and the first mixture is obtained after stirring and reacting at a speed of 3800rpm to 4200rpm for 8min to 10min ; The third step is to add the required amount of oil, dispersant, polymer fluid loss reducer and emulsifier to the first mixture in turn, and stir the reaction at a speed of 3800rpm to 4200rpm for 8min to 10min, then increase the...

Embodiment 2

[0022] Embodiment 2: The oil-based spacer fluid for cementing and cementing, the raw materials include 20 or 160 parts of weighting material, 10 or 20 parts of wetting agent, 5 or 22 parts of organic soil, and 50 parts of oil in terms of parts by weight. or 95 parts, 8 or 8 parts of suspending agent, 2 or 5 parts of dispersant, 5 or 6 parts of polymer fluid loss reducer, 10 or 25 parts of emulsifier and 6 or 21 parts of water, according to the following The above steps are obtained: the first step, the required amount of water is added to the reactor; the second step, the required amount of suspending agent is added to the water, and the first mixture is obtained after stirring and reacting at a speed of 3800rpm or 4200rpm for 8min or 10min ; The third step is to add the required amount of oil, dispersant, polymer fluid loss reducer and emulsifier to the first mixture in turn, and stir the reaction at a speed of 3800rpm or 4200rpm for 8min or 10min, then increase the speed to 9...

Embodiment 3

[0023] Embodiment 3: As an optimization of the above embodiment, the weighting material is at least one of iron ore powder, barite and chromium-manganese powder. The inertness of the weighting material prevents it from participating in the reaction of the slurry, and the low content of the weight enables it to disperse evenly and reduce the thixotropy of the slurry.

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Abstract

The invention relates to the technical field of oil-based spacer fluid, and particularly relates to oil-based spacer fluid for well cementation and cementing and a preparation method thereof. The oil-based spacer fluid for well cementation and cementing comprises a weighting material, a wetting agent, organic soil, oil, a suspending agent, a dispersing agent, a polymer fluid loss agent, an emulsifying agent and water. The preparation method comprises the five steps, a first mixture, a second mixture and a third mixture are sequentially obtained, and finally, the oil-based spacer fluid for wellcementation and cementing is obtained. By adjusting the oil-water ratio of the spacer fluid, pollution of the oil-based drilling fluid is reduced, and finally the purposes of simplifying cementing construction, improving the success rate and reducing the cost in the oil-based drilling fluid environment are achieved. According to the invention, oil is adopted as a main mixed liquid, and the interface wettability of the oil after being mixed with the oil-based drilling fluid and cement paste is changed under the combined action of the oil and the matched additives and emulsifiers, so that the technical indexes such as compatibility, stability and density of the oil-based drilling fluid, the spacer fluid and the cement paste are improved, and the technical requirements of well cementation and cement injection can be met.

Description

technical field [0001] The invention relates to the technical field of oil-based spacer fluid, and relates to an oil-based spacer fluid for well cementing and cementing and a preparation method thereof. Background technique [0002] At present, in the world, the amount of unconventional oil and gas resources has exceeded the amount of conventional oil and gas resources. Among them, the development of deep wells, ultra-deep wells and shale gas has changed the distribution of oil and gas resources in the world. So far, oil-based mud is resistant to high temperature and salt and calcium erosion, which is beneficial to wellbore stability, good lubricity, and less damage to oil and gas layers. Oil-based mud has been used in various drilling platforms. [0003] Due to the particularity of the oil well itself and its geology, a series of problems such as falling objects, exceeding the standard deviation, and lost circulation often occur during the drilling process. Well cementing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/424
Inventor 马疆王云郑永生高本文董军齐静李良兵朱伟伦李博阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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