Temperature-resistance drilling fluid drill-feeding plugging agent and its preparation method

Abstract

The invention relates to a temperature-resistance drilling fluid drill-feeding plugging agent and its preparation method, the drill-feeding plugging agent comprises the following components by weight: 30-80 parts of vegetable fiber, 10-40 parts of mineral fiber, 10-40 parts of fruit shell, 0-10 parts of powdered steatile, and 3-10 parts of silicon-based gel deformation particles. The silicon-based gel deformation particles enable emulsification and dispersion of 1.4-2.5 parts of vinyltriethoxysilane monomer according to weight to an aqueous solution composed of 18-24 parts of acrylamide, 0.0025-0.005 parts of N,N'-methylene bisacrylamide, 0.7-1.25 parts of OP-10 and 0.1-0.17 parts of sodium dodecyl benzene sulfonate, 0.003 parts of disodium ethylene diamine tetraacetate, 0.009-0.12 parts of ammonium persulfate and 0.009-0.012 parts of sodium bisulfate, a process of micellar copolymerization is carried out, a polymer is dried, granulated and crushed to obtain the silicon-based gel deformation particles with average particle size of 80-200 meshes; easy-leakage highly-permeable stratum and micro crack are effectively plugged, rheological parameter of the drilling fluid is not influenced, frictional resistance coefficient of the drilling fluid is reduced, a storage layer is protected, and the drill-feeding plugging agent is suitable for plugging the easy-leakage stratum and the storage layer.

Description

technical field [0001] The invention relates to a plugging agent for drilling fluid while drilling in the field of drilling, in particular to a plugging agent used at a high temperature of 150°C, which can block small cracks and leakage layers in the formation at the first time, and prevent lost circulation. [0002] A temperature-resistant drilling fluid plugging agent for preventing and controlling the lost circulation while drilling and a preparation method thereof. Background technique [0003] Lost circulation is a common and common technical problem in the drilling process. Lost circulation will cause a large loss of drilling fluid, which will lead to an increase in drilling costs. At the same time, it will cause changes in bottomhole pressure, induce wellbore instability, well collapse, well kick, blowout, etc. Occurrence of complex accidents. [0004] Plugging while drilling refers to adding the plugging material into the drilling fluid before drilling into formatio...

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Problems solved by technology

[0005] At present, the LWD materials used in the drilling field generally have the following problems: 1. The plugging performance is poor, and the expected plugging effect cannot be achieved, and the plugging while drilling cannot be realized; 2. The temperature resistance is poor, and the formation temperature is higher than At 120°C, the plugging performance becomes worse, and when the temperature reaches 150°C, the material fails; 3. After adding the plugging material while drilling, the drilling fluid thickens severely; 4. After adding the plugging material, the friction torque of the drilling fluid increases ;5. The vibrating screen sticks to the vibrating screen due to the viscosity increase of the drilling fluid or the excessive particle size of the plugging material.

[0007] Chinese patent CN101724383B discloses "a drilling fluid plugging agent while drilling". This plugging agent adds bentonite, calcium carbonate, kaolin and other fillers during the synthesis process of its deformed filling material, although it has a certain effect on improving the temperature resistance of the material. , but the synthesized particles are brittle and easily broken after absorbing water, causing defects in use; in addition, the proportion of organic materials (plant fiber, asphalt, deformed filling materials) in the system is too high, which is difficult to meet the application under high temperature conditions of 150 °C Require

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