High-temperature-resisting water-based well-drilling fluid filtrate reducer and preparation method thereof

Abstract

The invention discloses a high-temperature-resisting water-based well-drilling fluid filtrate reducer and a preparation method thereof. The high-temperature-resisting water-based well-drilling fluid filtrate reducer is prepared from the following raw materials in parts by mass: 700 parts of sulfomethylated phenol formaldehyde resin, 3-8 parts of formaldehyde, 6-15 parts of melamine, 8-20 parts ofa sulfonate monomer, 40-80 parts of an acrylamide monomer, 0.5-2 parts of a cross-linking agent, 0.3-0.6 part of an initiator, and 60-80 parts of water. The sulfomethylated phenol formaldehyde resin is modified and then subjected to a copolymerization with the multiple monomers, namely the high-temperature-resisting water-based well-drilling fluid filtrate reducer is synthesized by increasing hydration groups of a product and introducing new sulfonic groups and aromatic ring structures, thus the demand of safe well-drilling construction in a downhole high-temperature environment can be met, the rheological property and suspension stability of water-based well-drilling fluid under the high-temperature and high-pressure conditions can be controlled, and the high-temperature and high-pressurefilter loss of the well-drilling fluid is effectively decreased.

Description

Technical field [0001] The invention relates to a high-temperature resistant drilling fluid fluid loss agent and a preparation method thereof, and belongs to the technical field of oil field chemical preparation. Background technique [0002] As deep-seated oil and gas exploration and development efforts increase, the drilling encounters have become more and more complex. Generally speaking, the deeper the well, the higher the downhole pressure and temperature, and the greater the difficulty of drilling and completion. There are high temperature and high pressure formations in many parts of the world. In developed areas such as the United States and the North Sea, many reservoirs have pressures exceeding 100 MPa and bottom hole temperatures exceeding 200 ℃. In our country’s southwestern Tarim, Sichuan’s northeast of Sichuan, Daqing’s Xujiaweizi, and the ocean’s South China Sea Yingqiong Basin, there are different degrees of high temperature and high pressure drilling and comple...

AI Technical Summary

Problems solved by technology

However, if only high-temperature polymer fluid loss additives are used, it must be achieved by increasing the amount of polymer added. However, with the increase in the amount of polymer added, the viscosity of the liquid phase of the system will increase, which will bring new challenges to the rheological control of high-density drilling fluid. On the other hand, the cost of multi-component copolymers is generally much higher than that of high-temperature fluid loss additives currently on the market, which is not conducive to market competition

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