Micro foam foaming agent and its well drilling liquid system formula
A foaming agent and foam technology, applied in drilling equipment and other directions, can solve the problems of large foam particle size, high gas content, poor water feeding efficiency of mud pump, etc., and achieve good performance and effect.
Inactive Publication Date: 2004-12-22
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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Problems solved by technology
[0003] In order to overcome the problems of large foam particle size, high gas content, and poor water supply efficiency of mud pumps in the wellbore and surface drilling fluid circulation equipment of common foam drilling fluids, the present invention provides a microfoam foaming agent and its drilling fluid. The liquid system formula, using the micro-foam foaming agent of the invention and the drilling fluid material compatible wi
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Embodiment 3
[0021] Embodiment 3: drilling fluid system formula: microfoam blowing agent MF: foam stabilizer SF: selected lauryl alcohol can greatly strengthen the stability of the foam in the mud as the foam stabilizer of the present invention; Viscosifier: XC ( Biopolymer) or 80A51 (acrylamide sodium acrylate copolymer); fluid loss control agent: SMP, SPNH; specific formula of drilling fluid system: 5% base slurry + 0.3% MF + 0.03% SF + 2% SMP-II + 0.05 %80A51+0.2%XC+1%SPNH.
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Abstract
A microfoam generating agent for low-pressure or under-balance drilling of well and a well-drilling liquid containing it are disclosed. Their preparing proesses are also disclosed. Said well-drilling liquid features fine foam, high resistance to high temp (more than 120 deg.C), salt and calcium, low density, and high effect on protecting oil-bearing stratum.
Description
Technical field: [0001] The invention relates to a micro-foam foaming agent used in low-pressure drilling or underbalanced drilling and its drilling fluid system formula. Background technique: [0002] At present, domestic oil fields use ordinary foam drilling fluid in the process of low-pressure drilling or underbalanced drilling. The foam drilling fluid is used in the wellbore and ground drilling fluid circulation equipment. Due to the large foam particle size and high gas content, the water supply efficiency of the mud pump is poor. The foam fluid returned to the wellhead must be mechanically degassed before adding a foaming agent and re-inflating to achieve effective circulation, which inevitably increases the drilling cost. Using water-in-oil drilling fluid or oil-in-water drilling fluid for low-pressure drilling or underbalanced drilling, in addition to safety and cost factors, the ability of this type of drilling fluid to reduce the proportion of equivalent mud at the...
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Inventor 张振华孙延德
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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