Strong-sealing drilling fluid for preventing collapse of carbonaceous mudstone and preparation method
A technology of carbonaceous mudstone and drilling fluid, which is applied in the field of strong plugging drilling fluid and preparation of carbonaceous mudstone to prevent collapse. It can solve the problems that occur frequently, and achieve the effects of strong inhibition, increased production and good system performance.
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[0025] A method for preparing a strong plugging drilling fluid for carbonaceous mudstone collapse prevention, comprising the following steps:
[0026] Step 1) According to the needs of the site, a certain volume of water is filled in the slurry mixing tank;
[0027] Step 2) According to the above ratio, add the alkalinity control agent, viscosity increasing agent, fluid loss reducer, and plugging agent in the formulated amount into water under the action of the slurry pump, fully stir and mix evenly, and dissolve;
[0028] Step 3) Add liquid-phase weighting agent, anti-temperature agent, and inhibitor in proportion, stir and mix evenly, and dissolve;
[0029] Step 4) Add solid weighting agent according to on-site density requirements, and stir evenly;
[0030] Step 5) Add 1.0-2.0% lubricant according to the requirements for lubricity in field use.
Embodiment 1
[0032] This embodiment provides a carbonaceous mudstone anti-collapse strong plugging drilling fluid, including water and the following components in terms of mass percentage of water, 8% liquid phase weighting agent, 3% anti-temperature agent, inhibitor 3%, viscosifier 0.4%, fluid loss reducer 2.4%, plugging agent 6.5%, alkalinity control agent 0.1%, lubricant 1.0%, solid weighting agent 43%.
[0033] Preparation process: Put 100 cubic meters of water into the mixing tank; put 0.1 tons of alkalinity control agent, 0.4 tons of viscosity raising agent, 2.4 tons of fluid loss reducer, and 6.5 tons of plugging agent into the mixing pump. Add in water, mix well and dissolve; then add 8 tons of liquid phase weighting agent, 3 tons of anti-temperature agent, and 3 tons of inhibitor, mix well and dissolve; according to site requirements, add 1.0 tons of lubricating Agent, 43 tons of solid weighting agent, stir evenly, that is.
[0034] In the present embodiment, the alkalinity contr...
Embodiment 2
[0040] This embodiment provides a carbonaceous mudstone anti-collapse strong plugging drilling fluid, including water and the following components in terms of mass percentage of water, 5% liquid phase weighting agent, 3% anti-temperature agent, inhibitor 3%, viscosifier 0.4%, fluid loss reducer 2%, plugging agent 7.5%, alkalinity control agent 0.1%, lubricant 1.5%, solid weighting agent 39%.
[0041] Preparation process: Put 100 cubic meters of water into the slurry mixing tank; put 0.1 tons of alkalinity control agent, 0.4 tons of viscosity increasing agent, 2 tons of fluid loss reducer, and 7.5 tons of blocking agent into the slurry mixing pump Add in water, fully stir to mix and dissolve; then add 5 tons of liquid phase weighting agent, 3 tons of anti-temperature agent, and 3 tons of inhibitor, fully stir and mix and dissolve; according to the density requirements and lubricity requirements on site, According to the needs of the site, add 1.5 tons of lubricant and 39 tons o...
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