Shielding and temporary plugging gelling agent for drilling fluid and production method and use method thereof

Abstract

The invention relates to a shielding and temporary plugging gelling agent for drilling fluid and a production method and a use method thereof. The shielding and temporary blocking gelling agent for the drilling fluid comprises the components as follows: forcible blocking powder, a fluid loss additive or a flow pattern improver, a plant gelling agent, a calcification agent and expanded plant shortfibers. The performance index of a product of the invention is higher than the physicochemical performance index of domestic existing like products, for example, the fineness screen residue weight isnot more than 10 percent, the water content is not more than 10 percent, a pH value is stable, and the shielding and temporary plugging gelling agent is more suitable for being added into the drilling fluid; the shielding and temporary plugging gelling agent has good compatibility with basic mud, low viscosity effect when being added into the basic mud, low apparent viscosity effect, no influenceon the performance of the drilling fluid, a certain water loss reduction function and strong plugging capability, and the filtration loss is not more than 10ml and is higher than a standard of domestic existing like products; and the plugging filtration loss is not more than 40ml within equal plugging time, and the plugging filtration loss of the domestic similar prior products is only not more than 80ml, indicating that the plugging capability and the capability for protecting productive layers of oil, gas, water and the like of the shielding and temporary plugging gelling agent for the drilling fluid are superior to the domestic existing like products.

Description

technical field [0001] The present invention relates to the technical field of leakage prevention and plugging and oil and gas reservoir protection shielding temporary plugging gelling agent products used in drilling fluid in the field of oil field drilling production, and relates to a shielding temporary plugging gelling agent for drilling fluid and its production method and Instructions. Background technique [0002] At present, with the continuous development and improvement of drilling technology in domestic and foreign drilling fields, deep wells, ultra-deep wells, directional wells, and horizontal wells with high technical difficulty and high risk that have not been involved in the past have also been drilled correspondingly, but lost circulation is still a problem. It is a major technical problem restricting the quality and speed of drilling. Lost circulation will occur when there are pores and cracks in the formation encountered during drilling. The types of lost c...

AI Technical Summary

Problems solved by technology

Once leakage occurs, it will not only delay drilling time, lose drilling fluid, damage oil and gas layers, and interfere with geological logging work, but may also cause a series of complex situations and accidents such as well collapse, drill sticking, and blowout, and even cause the wellbore to be scrapped, resulting in major economic loss

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