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Drilling fluid system for improving formation conditions as well as preparation method and application of drilling fluid system

A technology for formation conditions and drilling fluids, applied in chemical instruments and methods, earthmoving drilling, flushing wellbore, etc., can solve the prominent contradiction between rheology and filtration loss and wall-building, serious drilling fluid thickening phenomenon, and drilling fluid performance Deterioration and other problems, to achieve the effects of good wellbore stability, enhanced pressure bearing capacity and low cost

Active Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the process of drilling in deep formations, under the action of continuous high temperature, the thickening phenomenon of conventional drilling fluid is serious, the contradiction between rheology and fluid loss wall building is prominent, and it is easy to be polluted by salt, gypsum and calcium intrusion, which leads to the deterioration of drilling fluid performance , the maintenance and handling are complex, and even lead to a series of downhole complex situations

Method used

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  • Drilling fluid system for improving formation conditions as well as preparation method and application of drilling fluid system

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Embodiment 1

[0026] A method for preparing a drilling fluid system for improving formation conditions, comprising the following steps:

[0027] (1) configure the drilling fluid, the drilling fluid is based on 100 parts by weight of water, the content of the bentonite is 4 parts by weight, the content of the low-viscosity anionic cellulose is 2 parts by weight, and the content of the polyamine The content is 0.5 parts by weight, the content of the sulfonated phenolic resin (II) is 5 parts by weight, the content of the SMC is 4 parts by weight, the content of the anhydrite is 0.6 parts by weight, and the content of the NaOH is 0.5 parts by weight, the content of the lignite resin is 4 parts by weight, the content of the potassium chloride is 6 parts by weight, the content of the high temperature and salt resistance fluid loss reducer is 0.8 parts by weight, the silanol inhibitor The content of the film-forming agent is 0.5 parts by weight, the content of the film-forming agent is 0.3 parts b...

Embodiment 2

[0034] A method for preparing a drilling fluid system for improving formation conditions, comprising the following steps:

[0035] (1) configure the drilling fluid, the drilling fluid is based on 100 parts by weight of water, the content of the bentonite is 4.5 parts by weight, the content of the low-viscosity anionic cellulose is 2.3 parts by weight, and the content of the polyamine The content is 0.6 parts by weight, the content of the sulfonated phenolic resin (II) is 5.6 parts by weight, the content of the SMC is 5.5 parts by weight, the content of the anhydrite is 0.65 parts by weight, and the content of the NaOH is 0.5 parts by weight, the content of the lignite resin is 5.8 parts by weight, the content of the potassium chloride is 8 parts by weight, the content of the high-temperature and salt-resistant fluid loss reducer is 0.55 parts by weight, the silanol inhibitor The content of the film-forming agent is 0.7 parts by weight, the content of the film-forming agent is ...

Embodiment 3

[0042] A method for preparing a drilling fluid system for improving formation conditions, comprising the following steps:

[0043] (1) configure drilling fluid, the drilling fluid is based on 100 parts by weight of water, the content of the bentonite is 3.6 parts by weight, the content of the low-viscosity anionic cellulose is 0.8 parts by weight, and the content of the polyamine The content is 0.55 parts by weight, the content of the sulfonated phenolic resin (II) is 6.5 parts by weight, the content of the SMC is 4.5 parts by weight, the content of the anhydrite is 0.6 parts by weight, and the content of the NaOH is 0.6 parts by weight, the content of the lignite resin is 5.5 parts by weight, the content of the potassium chloride is 6 parts by weight, the content of the high temperature and salt fluid loss reducer is 1.1 parts by weight, the silanol inhibitor The content of the film-forming agent is 0.6 parts by weight, the content of the film-forming agent is 0.75 parts by w...

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Abstract

The invention provides a drilling fluid system for improving formation conditions and a preparation method thereof. The drilling fluid system contains a drilling fluid, inorganic micro-nano rigid particles A with spherical particle sizes of 1000-1400 meshes, inorganic micro-nano rigid particles B with spherical particle sizes of 1900-2800 meshes and polymer emulsified asphalt. The drilling fluid contains 100 parts by weight of water; and based on 100 parts by weight of water, the content of the inorganic micro-nano rigid particles A is 0.5-5 parts by weight, the content of the inorganic micro-nano rigid particles B is 0.5-5 parts by weight, and the content of the polymer emulsified asphalt is 1-10 parts by weight. A stable mud cake structure can be formed between a shaft and a stratum through the inorganic micro-nano rigid particles with the two different particle sizes and the macromolecular emulsified asphalt with the specific content, and then a stratum condition can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of treatment agents for drilling fluids, in particular to a drilling fluid system for improving formation conditions, a preparation method and application thereof. Background technique [0002] In the process of drilling in deep formations, under the action of continuous high temperature, the thickening phenomenon of conventional drilling fluid is serious, the contradiction between rheology and fluid loss wall building is prominent, and it is easy to be polluted by salt, gypsum and calcium intrusion, which leads to the deterioration of drilling fluid performance , The maintenance process is complicated, and even a series of downhole complex situations are caused. Under normal circumstances, there are a large number of fractures in the collapsed formation. When drilling into the formation, the drilling fluid will quickly enter the formation along these fractures. At the same time, the mud shale will expand an...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/20E21B21/00
CPCC09K8/16C09K8/206E21B21/00C09K2208/10C09K2208/12
Inventor 沈青云张俊罗发强翟科军贾晓斌李双贵何仲于洋方俊伟耿云鹏范胜方静李银婷李文霞
Owner CHINA PETROLEUM & CHEM CORP
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