Temperature-resistant and salt-resistant fluid loss reducer for drilling fluid and preparation method thereof

Abstract

The invention discloses a temperature-resistant and salt-resistant fluid loss reducing agent for drilling fluid and a preparation method thereof. The fluid loss reducing agent is made of the following raw materials in parts by weight: 80-100 parts of carboxymethyl cellulose sodium, 30-100 parts 50 parts of natural asphalt, 40-60 parts of sulfonated asphalt, 15-30 parts of sulfonated nitro humic acid, 50-70 parts of sulfonated phenolic resin, 20-40 parts of water-based acrylic resin, 6-10 parts of initiator and 10 parts -40 parts of water, the preparation method is: Stir 1 / 2 of the initiator, water, natural asphalt and sulfonated phenolic resin at 100-120°C for 1.5-2h, then add sulfonated asphalt and sulfonated nitro humic Acid, stir for 20-40min, then adjust the temperature to 60-70°C, add the remaining 1 / 2 initiator and water-based acrylic resin, stir for 2-2.5h, adjust the temperature to 45-55°C, add sodium carboxymethylcellulose , stirred for 3-4 hours, dried and pulverized to obtain the temperature-resistant and salt-resistant fluid loss additive for drilling fluid. The invention has the advantages of being able to effectively reduce the water loss of the drilling fluid and at the same time be resistant to temperature and salt.

Description

technical field [0001] The invention relates to the technical field of additives for drilling fluids, more specifically, it relates to a temperature-resistant, salt-resistant fluid loss reducing agent for drilling fluids and a preparation method thereof. Background technique [0002] With the rapid development of China's economy, the consumption of oil and gas resources has risen sharply, and it is urgent to realize new breakthroughs in the exploration and development of oil and gas resources. In order to realize my country's oil and gas resources strategy and development goals, oil and gas exploration and development in deep formations has become an inevitable development trend under the current situation. At present, the number of deep wells and ultra-deep wells drilled in the world is increasing. With the increase of formation depth, the geological conditions of deep formations are more harsh, and the temperature of the bottom of the well is getting higher and higher, whi...

AI Technical Summary

Problems solved by technology

However, in the process of deep well operation, the harsh environment of high temperature and high pressure will damage the rheology and fluid loss of the drilling fluid, and at the same time cause the drilling fluid treatment agent to appear different degrees of high-temperature cross-linking and degradation. In severe cases, the drilling fluid will be completely lost. its efficacy

[0003] Drilling fluid loss reducer is an important drilling fluid treatment agent. The fluid loss reducer can form a thin and dense flexible filter cake through low permeability to effectively prevent leakage. However, with the increase of drilling depth, the bottom hole temperature , the pressure is also rising, and the formation is more complex, which brings great challenges to drilling engineering. Ordinary drilling fluid fluid loss additives have lost their effectiveness in high temperature environments. the meaning of