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Polymeric alochol biopolymer saturated salt-water drilling fluid

A biopolymer and polyalcohol technology, applied in the field of petroleum drilling engineering, can solve the problems of low oil layer pressure coefficient and low underground energy, and achieve the effects of reducing pressure loss, preventing lost circulation, and good rheological properties

Inactive Publication Date: 2007-03-28
CHINA PETROCHEMICAL CORP
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Problems solved by technology

[0003] Aiming at the special oilfield conditions with developed gypsum-salt layers, many faults, complex formation changes, low underground energy, and low pressure coefficient of oil layers, in order to overcome the unavoidable technical problems in the construction of existing polymer freshwater drilling fluids, the present invention provides A polyalcohol biopolymer saturated brine drilling fluid, which is not only suitable for highly deviated wells, horizontal wells, and sidetracking wells, but also suitable for gypsum-salt formations, multiple faults, complex formation changes, low underground energy, and reservoir pressure Special oil fields with low coefficient

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Embodiment Construction

[0025] According to the site conditions, before drilling to the highly deviated well section, the sidetracking well section and the horizontal well section, the drilling fluid of the present invention is prepared strictly according to the formula: the best formula is selected and prepared as follows: 3% sodium soil+0.2%NaOH+1%CMS modified Starch + 0.2% HV-CMC carboxymethyl cellulose + 4% anti-saline soil + 35% NaCl + 0.15% XC biopolymer + 2% polyalcohol L-35B, and add water to stir the rest. 1% RH lubricant-3 + 1-2% anti-seize lubricant can be added to the field adjustable formula. With sufficient drilling fluid volume, it is used in drilling construction to make its performance meet the requirements of lubrication, carrying, wellbore stability and oil layer protection.

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Abstract

The invention discloses a kind of polymeric alcohol biological polymer saturated brine drilling liquid used for petroleum drilling. It comprises 2 - 4% sodium earth, 0.2 - 0.3% NaOH, 1 -2 % CMS modified starch, 0.3 - 0.4% HV-CMC carboxymethyl fibrous bundle, 3 - 5% anti-salt clay, 30 - 35% NaCl, 0.2 - 0.1% XC biology polymer and 2 - 3% polymeric alcohol L -35B, and the remaining adds water and mix round to produce. Its formula is reasonable, and its operation is convenient. Besides it provides ideal drilling slurry system for the large pitch drilling section, side boring drilling section and drilling of horizontal drilling of special oil field where ointment salt layer develops, has many faultage, stratum change is complex, underground energy is low and oil layer pressure coefficient is low.

Description

Technical field [0001] The invention relates to an improved drilling fluid in the technical field of petroleum drilling engineering, in particular to a polyalcohol biopolymer saturated brine drilling fluid system adapted to the characteristics of gypsum-salt formations for highly deviated wells, horizontal wells and sidetracked wells, suitable for use with petroleum Drilling works. Background technique [0002] Drilling Fluid Completion fluid is a key factor for the success of highly deviated wells, horizontal wells, and sidetracked wells. The known multi-polymer freshwater drilling fluid systems are only suitable for salt-free formations. For the special oilfield conditions with developed gypsum-salt layers, many faults, complex formation changes, low underground energy, and low pressure coefficient of oil layers, the currently suitable drilling fluids The well fluid has not been reported yet. When using polymer freshwater drilling fluid, the unavoidable technical problems...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/10
Inventor 程小云叶诗君童伏松危胜宏
Owner CHINA PETROCHEMICAL CORP
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