Low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system
A high-density, soil-phase technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of water sensitivity of high salinity formations, reduce the compactness of mud cakes, and have great influence on rheology, and achieve resistance to water. Inferior soil has strong pollution ability, improved calcium resistance and low filtration effect
Inactive Publication Date: 2015-09-09
山东得顺源石油科技有限公司
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Problems solved by technology
High-density drilling fluid contains a large amount of weighting materials such as barite and iron ore powder. These hard particles will reduce the compactness of the mud cake and lead to an increase in fluid loss
Sodium bentonite is a good filling material, which can effectively improve the density of mud cake, but it has a great influence on rheology and is sensitive to high salinity formation water
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0034] Weigh the components according to the amount of Example 1 in Table 1, and add the prepared drilling fluid sequentially under high-speed stirring (11000 r / min).
Embodiment 2
[0036] Weigh the components according to the amount of Example 2 in Table 1, and add the prepared drilling fluid in sequence under high-speed stirring (11000 r / min).
Embodiment 3
[0038] Weigh the components according to the amount of Example 3 in Table 1, and add the prepared drilling fluid in sequence under high-speed stirring (11000 r / min).
[0039] Table 1 Example 1-3 Low Soil Phase High Density Anti-Calcium Saturated Brine Drilling Fluid System Formulation Composition
[0040]
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The invention relates to a low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system. The low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system comprises, by weight, 0.5-1.5% of bentonite, 0.1-0.3% of sodium carbonate, 0.1-0.3% of encapsulating agent, 2-5% of fluid loss agent A, 1-4% of fluid loss agent B, 1-2% of aluminum-based polymer, 0.5-1% of surfactant, 1-5% of sealing anti-collapse agent, 3-7% of potassium chloride, 30-35% of sodium chloride, 0.1-0.5% of sodium hydroxide, 100-200% of weighting materials and 100% of water. The low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system is excellent in calcium resistance; drilling fluid density is adjustable and maximally up to 2.0gcm<-3>; the drilling fluid contains high-density sodium chloride and is effective in suppression of salt-bed dissolution.
Description
technical field [0001] The invention relates to the technical field of oil field drilling, in particular to a low soil phase high density anti-calcium saturated brine drilling fluid system. Background technique [0002] Calcium-containing formations such as salt-gypsum formations and high-pressure brine formations are often encountered during drilling. High-concentration calcium ions are more destructive to common drilling fluid systems. For example, calcium salts are added to finely dispersed drilling fluid systems. Negatively charged clay particles show poor rheology, increased fluid loss, thickened mud cake and loose structure. The calcium-treated drilling fluid system refers to the pre-calcium treatment of sodium bentonite, and the addition of a dispersant with gel-protecting ability, so that the clay particles are in a moderately dispersed state and have good salt and calcium resistance. However, the calcium treatment system When drilling into a high-salinity saline la...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 王树永吕本正郭东荣
Owner 山东得顺源石油科技有限公司
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