High-temperature-resistant fluid loss agent and preparation method thereof as well as water-based drilling fluid

A filtrate reducer, high temperature resistance technology, applied in the field of petroleum drilling fluid, can solve the problems of easy decomposition, poor temperature resistance, weakened filter loss effect, etc.
CN108342188AInactive Publication Date: 2018-07-31CHINA UNIV OF GEOSCIENCES (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA UNIV OF GEOSCIENCES (BEIJING)
Publication Date
2018-07-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a high-temperature-resistant fluid loss agent and a preparation method thereof. According to the invention, the preparation conditions are strictly controlled to obtain a polymer formed by co-polymerization of various monomers, and due to statistical characteristics of the polymer in a formation process, a characteristic of non-uniform molecular weight of the fluid loss agent, i.e., polydispersity of the molecular weight, is formed, thus greatly improving the rheological property and temperature and salt resistance of the drilling fluid under high temperature conditions;in addition, the molecular structure of the high-temperature-resistant fluid loss agent also contains benzene rings which have stronger rigidity than linear molecular chains, enhance the rigidity ofmolecular chains, improve the thermal stability of the fluid loss agent, and improve the temperature resistance of the fluid loss agent in a drilling fluid. The invention also provides a water-based drilling fluid containing the high-temperature-resistant fluid loss agent. The fluid loss agent provided by the invention can still maintain good fluid loss reducing property under a high-temperature condition of 200 DEG C in a fresh water-based slurry and also can maintain good fluid loss reducing property under a high-temperature condition of 160 DEG C in a composite brine-based slurry.
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Description

technical field

[0001] The invention relates to the technical field of petroleum drilling fluids, in particular to an anti-high temperature fluid loss reducer, a preparation method thereof and a water-based drilling fluid. Background technique

[0002] The quality of drilling fluid is the key to the success of the entire drilling project, and the level of drilling fluid technology is also an important indicator to measure the level of drilling. With the continuous development of petroleum exploration and development technology, the exploration and development of oil and gas has gradually turned to ultra-deep formations. During the exploration and development of deep wells and ultra-deep wells, the formations encountered are becoming more and more complex, and the requirements for drilling fluid performance are more stringent.

[0003] During the drilling process, as the well depth increases, the downhole temperature will become higher and higher, and the pressure will also ...

Claims

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