Preparation method of efficient anti-sloughing leak-proof drilling fluid
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A technique of drilling fluid and preparation method, which is applied in the direction of drilling composition, chemical instruments and methods, etc., which can solve the problems of poor anti-slump and anti-leakage effects of drilling fluid, and achieve the effect of improving slurry production rate and simple operation
Inactive Publication Date: 2016-01-06
山东聚鑫化工有限公司
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Problems solved by technology
At present, the anti-collapse and anti-leakage effect of the drilling fluid used in oil field drilling is not good
Method used
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[0016] Preparation method: Precure sodium bentonite with deionized water for 24 hours, add it to brine containing 1.2% NaCl, then add barite powder 2%, graphite 0.6%, oxidized pitch 0.8%, silicic acid 2% sodium, 2% slaked lime, and 2% sodium hydroxide were stirred for 2 hours respectively, and finally 1% cottonseed husk powder was added and stirred for 1 hour.
Embodiment 2
[0018] Ingredients (mass percentage)
[0019] Sodium bentonite 6%, barite powder 10%, graphite 0.8%, oxidized pitch 1%, sodium silicate 2%, slaked lime 2%, sodium hydroxide 2%, cottonseed husk powder 2%, deionized water 18%, the rest is Saline with 1% NaCl.
[0020] Preparation method: Precure 6% sodium bentonite with fresh water for 24 hours, add it to brine containing 1% NaCl, then add barite powder 10%, graphite 0.8%, oxidized pitch 1%, silicic acid according to the proportion 2% sodium, 2% slaked lime, and 2% sodium hydroxide were stirred for 2 hours respectively, and finally 2% cottonseed husk powder was added and stirred for 1 hour.
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Abstract
A preparation method of an efficient anti-sloughing leak-proof drilling fluid, belongs to the technical field of oil field chemistry. The drilling fluid comprises the following raw materials by weight: 1-6% of sodium bentonite, 1-10% of a heavier material, 0.5-1% of a lubrication agent, 0.7-3% of oxidized bitumen, 1-3% of sodium silicate, 1-4% of quick lime, 0.5-2% of sodium hydroxide, 0.7-2% of cottonseed hull powder, 30%-40% of deionized water and the balance of brine. The method comprises the steps of: first pre-hydrating the sodium bentonite in deionized water for 24 h, then adding the sodium bentonite to brine, then adding a weighting material, a lubricant, oxidized bitumen, sodium silicate, quick lime and sodium hydroxide, respectively stirring for 2 h, and finally adding cottonseed hull powder and stirring for 1 h. The efficient anti-sloughing leak-proof drilling fluid provided by the invention contains ingredients in a proper proportion, the obtained product has good anti-sloughing and leak-proof effect, can cram slits for different stratums. Moreover, the preparation method is simple.
Description
technical field [0001] The invention relates to a method for preparing high-efficiency anti-slump and anti-leakage drilling fluid, which belongs to the technical field of oil field chemistry. Background technique [0002] Drilling fluid is one of the necessary materials used to balance formation pressure during drilling and ensure safe and smooth drilling. During the drilling process, lost circulation is a phenomenon that a large amount of working fluids such as drilling fluid, completion fluid, and workover fluid leak into the formation when the formation pressure is lower than the fluid column pressure. Lost circulation will cause downhole accidents or complex situations, resulting in prolonged construction time, increased operating costs, and even the scrapping of oil and gas wells, resulting in a large amount of economic losses. In order to prevent the drilling fluid from leaking into the formation, or to quickly and successfully plug the leakage channel after the leaka...
Claims
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Application Information
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