Amphoteric ionic ultra-high-temperature polysulfonate drilling fluid

Abstract

The invention relates to an amphoteric ionic ultra-high-temperature polysulfonate drilling fluid. The amphoteric ionic ultra-high-temperature polysulfonate drilling fluid comprises the components in percentage by mass as follows: 4.0-6.0% of bentonite, 0.5-0.8% of an amphoteric ionic polymer coating agent, 0.8-1.2% of an amphoteric ionic polymer diluting agent, 3-4% of a filtrate reducer resistant to high temperature, 3-4% of a compound filtrate reducer resistant to high temperature, 2-3% of a high temperature stabilizer, 0.2-0.3% of caustic soda, 3-4% of an inert blocking agent and the balance of water, wherein the amphoteric ionic polymer coating agent is prepared by using acrylamide, acrylic acid, sodium allyl sulfonate and dimethyl diallyl ammonium chloride as raw materials and using N1,N1,N2,N2-tetra-allyl ethylene diamine as a cross-linking agent; and the amphoteric ionic polymer diluting agent is prepared by using acrylamide, sodium allyl sulfonate and dimethyl diallyl ammonium chloride as raw materials. The amphoteric ionic ultra-high-temperature polysulfonate drilling fluid has the characteristics that the amphoteric ionic polymer and the ultra-high-temperature stabilizer are introduced into the polysulfonate drilling fluid system to enhance the high-temperature resistance of the water-based polysulfonate drilling fluid.

Description

Technical field [0001] The invention relates to a high temperature resistant polysulfide drilling fluid system in drilling engineering in the field of petroleum and natural gas exploration and development. By introducing a zwitterionic polymer and a high temperature protective agent into the polysulfide drilling fluid system, the high temperature resistance of the system is increased to 250°C. Background technique [0002] With the depletion of oil and gas resources in shallow and medium-deep layers and the increasing demand for oil and gas, it has become an inevitable trend to extend oil and gas exploration to deep and ultra-deep layers. However, the drilling and development of deep oil and gas reservoirs is faced with harsh conditions of high temperature and ultra high temperature, which puts forward higher requirements on the high temperature resistance of drilling fluid. The insufficient temperature resistance of commonly used water-based drilling fluids has become a maj...

AI Technical Summary

Problems solved by technology

[0004] Ultra-high temperature drilling fluid is an important technical guarantee for drilling ultra-high temperature wells. The traditional polysulfonate water-based drilling fluid has a temperature resistance below 200 °C, which is difficult to meet the drilling needs of more and more ultra-deep wells and ultra-high temperature wells. Research and development have The new polysulfonate water-based drilling fluid with ultra-high temperature resistance is of great significance

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