Solid-free killing fluid and preparation method thereof

Abstract

The invention discloses a solid-free killing fluid and a preparation method thereof. The solid-free killing fluid is prepared from the following reagents in a ratio: 2.5L of weighting agent solution of which the density is 1.08-1.53g / cm<3>, 5g of 80A51, 7.5g of CMC high-viscidity agent, 5g of filtrate reducer, 37.5g of oil layer protective agent and 7.5g of anti-swelling agent. The preparation method of the solid-free killing fluid comprises the following steps: 1, preparing the weighting agent solution of which the density is 1.08-1.53g / cm<3>; 2, fully mixing the 80A51, the CMC high-viscidity agent, the filtrate reducer, the oil layer protective agent and the anti-swelling agent with the first weighting agent solution in the first step respectively, so as to prepare the weighting agent solution, wherein each 2.5L of weighting agent solution contains 5g of 80A51, 7.5g of CMC high-viscidity agent, 5g of filtrate reducer, 37.5g of oil layer protective agent and 7.5g of anti-swelling agent. The solid-free killing fluid does not contain a calcium ion or a chloride ion, and is small in damage to stratum, low in friction and pressure loss, simple in raw material preparation and strong in maneuverability, and has good rheological property.

Description

Technical field [0001] The invention relates to a solid-free well killing fluid and a preparation method thereof. Background technique [0002] The development of killing fluids at home and abroad has successively experienced several stages, including clean water-natural mud-finely dispersed mud-non-dispersed low solid mud-non-solid mud. At present, the main domestic kill fluid systems include foam kill fluid system, solid phase temporary plugging kill fluid system and glue hydraulic well fluid system. However, due to the complex process of the foam killing fluid system and short stabilization period; the solid temporary plugging and killing fluid system has great damage to the formation and must be pickled before being put into production; the glue fluid of the glue hydraulic well fluid system is difficult to reverse flow into the formation and it is difficult to restore productivity The solubility of the thickener is not good; the kill fluid deployed on site is easy to stratif...

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Problems solved by technology

[0004] The main purpose of the present invention is that in order to further eliminate the harm of clay to mud performance, a solid-free well killing fluid system is being established and developed at present. This system helps to solve problems such as the decline in drilling speed and has high thermal stability. , and greatly reduce the cost of use

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