Shale gas exploitation oil-based drilling fluid well-cementing prepad fluid
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A technology of oil-based drilling fluid and cementing pre-fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the quality of cementing, the performance of cementing slurry, and it is difficult to achieve flushing and isolation. , replacement and other problems to achieve the effect of improving cementing quality
Active Publication Date: 2014-03-19
JINGZHOU JIAHUA TECH
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In the development of shale gas, oil-based drilling fluid is often used, and the large amount of surfactant contained in it and the high-concentration calcium chloride brine in the water phase have a great impact on the performance of cementing sl
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[0026] According to the pre-fluid 20m on site 3 design, where the cleaning fluid 10m 3 , accounting for 50% by volume; flushing solution 10m 3 , accounting for 50% of the volume; spacer 0m 3 , accounting for 0% by volume.
[0031] According to the pre-fluid 25m on site 3 design, where the cleaning fluid 10m 3 , accounting for 40% by volume; flushing solution 10m 3 , accounting for 40% by volume; spacer 5m 3 , accounting for 20% by volume.
[0032] The method of using the pre-fluid on site is: prepare the required cleaning solution in the 1# mixing tank, prepare the required rinsing solution in the 2# mixing tank, and prepare the required spacer solution in the 3# mixing tank; strictly follow the cleaning solution on site, The sequence and ratio of flushing fluid and spacer fluid are injected into the well to achieve the purpose of cleaning, displacement and isolation.
[0033] Tab...
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Abstract
The invention relates to shale gas exploitation oil-based drilling fluid well-cementing prepad fluid, and belongs to the technical field of petroleum drilling engineering chemistry. The well-cementing prepad fluid is characterized by comprising the following components by volume percent: 30-50% of cleaning fluid, 30-50% of flushing fluid and 0-40% of spacer fluid; the cleaning fluid is composed of a cleaning fluid additive, a weighting agent and water; the flushing fluid is composed of a flushing fluid additive, a weighting agent and water; the spacer fluid is composed of a spacer fluid additive, a weighting agent and water; the cleaning fluid additive is composed of a non-ionic surfactant and a mutual solvent, the flushing fluid additive is composed of a surfactant and a mutual solvent, and the spacer additive is composed of a tackifier and a filtrate reducer. The prepad fluid is capable of effectively eliminating an oil-based drilling fluid mud cake, effectively tidying a well wall and effectively isolating the drilling fluid from the cement mortar; the aims of effectively replacing and isolating are achieved, so that the well-cementing quality is improved.
Description
Technical field: [0001] The invention relates to an oil-based drilling fluid cementing pre-fluid for shale gas development, and belongs to the technical field of chemical agents for petroleum drilling engineering. Background technique: [0002] The vast majority of drilling fluids used in oil extraction operations, whether water-based or oil-based, are incompatible with cement slurries. During cementing construction, if the cement slurry is in direct contact with the drilling fluid, the drilling fluid will have cement invasion, and the cement slurry will be polluted by the drilling fluid to produce viscous flocculation, which will lead to cementing failure. Therefore, it is necessary to inject one or more liquid slugs between the drilling fluid and the cement slurry, which are called pad fluids. Conventional prefluids can be divided into flushing fluid and spacer fluid according to their functions. Flushing fluid usually has the effect of reducing the viscosity and shear fo...
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