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A strong suppression and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing the use efficiency of other treatment agents, increasing the salinity of drilling fluid, and making no positive contribution to performance, etc., to achieve Prevent wellbore instability, less damage to the reservoir, and strong inhibition
Inactive Publication Date: 2013-01-09
CNPC XIBU DRILLING ENG
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These anions do not contribute positively to the performance of the entire drilling fluid system. On the contrary, due to the existence of a l...
Method used
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Embodiment 1
[0014] Example 1, the strong inhibition and strong plugging drilling fluid contains 0.5% to 15% of strong inhibitor, 0.5% to 7% of strong plugging agent, 0.5% to 5% of bentonite, and 0.2% to 5% of fluid loss control agent by weight percentage. 6%, coating agent 0.1% to 0.5%, and the balance is water.
[0015] Below is the further optimization or / and improvement to above-mentioned embodiment 1:
[0016] According to needs, strong inhibition and strong plugging drilling fluid: by weight percentage, it also contains one or more combinations of flow regulator 0.1% to 1.5%, lubricant 0.1% to 2%, and weighting agent 0.5% to 70%. thing.
[0017] According to needs, the strong inhibitor is one or more combinations of potassium-calcium complex inhibitor, potassium chloride, potassium silicate, potassium formate, organic salt, amine-based polymer and quaternary ammonium salt cation. The best inhibitor is a potassium-calcium compound inhibitor. According to theoretical analysis, the...
Embodiment 2
[0022] Embodiment 2, the difference with above-mentioned embodiment 1 is: embodiment 2 contains water 79.8% by weight percentage, sakado 4%, zwitterionic polymer 0.2%, carboxymethyl starch 0.5%, hydrolyzed polyacrylonitrile ammonium salt 0.5%, potassium calcium compound inhibitor 5%, sulfonated phenolic resin 3%, cationic modified asphalt 7%.
Embodiment 3
[0023] Embodiment 3, the difference with above-mentioned embodiment 1 to 2 is: embodiment 3 contains water 78.8% by weight percentage, sakado 4%, zwitterionic polymer 0.2%, carboxymethyl starch 0.5%, hydrolyzed polyacrylonitrile Ammonium salt 0.5%, potassium calcium compound inhibitor 8%, sulfonated phenolic resin 3%, cationic modified asphalt 5%.
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Abstract
The invention relates to the technical field of drilling fluid for petroleum drilling, particularly to high-inhibition strong-blocking drilling fluid. The drilling fluid comprises, by weight, 0.5%-15% of a strong inhibitor, 0.5%-7% of a strong blocking agent, 0.5%-5% of bentonite and 0.2%-6% of a fluid loss agent. The drilling fluid has strong inhibiting effect on hydration of strong water-sensitive mud shales through high concentration K+ generated after dissolution of the strong inhibitor; simultaneously, anions generated after the dissolution of the strong inhibitor take the absorption action with the surface of clay through the absorption capacity so as to form protective films on the surface of the clay, and therefore the hydration of the clay is prevented; and the strong blocking agent can achieve strong blocking to strong water-sensitive mud shale stratums with micro-cracks to form isolating films in the real sense, and therefore instability of well walls of the strong water-sensitive mud shale stratums is prevented. The drilling fluid has the advantages of being good in blocking, strong in inhabitation, good in lubricity, stable in high temperature property, small in damage to reservoir stratums, free of pollution and capable of improving the production efficiency.
Description
technical field [0001] The invention relates to the technical field of drilling fluid for petroleum drilling, and is a drilling fluid with strong inhibition and strong plugging. Background technique [0002] Drilling fluid is a working fluid that has many functions during drilling, such as carrying and removing cuttings, cooling and lubricating the drill bit, balancing formation pressure, protecting the stability of the wellbore wall and protecting the oil layer from damage. Its performance directly affects drilling efficiency and downhole drilling. Safety and cost control are important components of drilling engineering technology. In drilling engineering, we often encounter strong water-sensitive mud shale formations, which are likely to cause complex accidents such as bit bagging, well wall collapse, well diameter reduction, torque increase, and drilling tool jamming, which will bring great harm to drilling engineering. . In order to solve the above problems, in the pas...
Claims
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Application Information
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