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High-temperature and salt-resistant high-density spacer fluid and preparation method thereof

A high-density, high-temperature-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of suspension capacity limitation and suspension capacity weakening, and achieve low water loss, high fluidity, and compatibility good sex effect

Active Publication Date: 2019-08-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used high-density spacers use cellulose, xanthan gum and other materials as suspension stabilizers, and the suspension ability becomes weak at high temperatures, and the suspension ability is limited at high densities.

Method used

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  • High-temperature and salt-resistant high-density spacer fluid and preparation method thereof
  • High-temperature and salt-resistant high-density spacer fluid and preparation method thereof
  • High-temperature and salt-resistant high-density spacer fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Slowly add 2 parts of suspension stabilizer to 100 parts of water, mix evenly, stir in a Waring mixer at a speed of 4000r / min for 1.5min, stop stirring, hydrate for 8min, then slowly add 195 parts of weighting agent, and then add 7 1 part of water loss reducer, 5 parts of cleaning agent, 1 part of retarder and 18 parts of sodium chloride, mix well and then stir at 2000r / min for 1min, finally add 0.2 part of defoamer, stir evenly to get the density 2.0g / cm 3 High-temperature and salt-resistant high-density spacer fluid.

[0029] Among them, the weighting agent consists of 180 parts with an average particle size of 100 μm and a density of 5.0 g / cm 3 The iron ore powder and 15 parts have an average particle size of 1.8μm and a density of 5.05g / cm 3 The micro manganese composition; the defoamer is a mixture of simethicone oil and tributyl phosphate in a weight ratio of 1:0.2.

Embodiment 2

[0031] Slowly add 1.6 parts of suspension stabilizer to 100 parts of water, mix evenly, stir in a Waring mixer at a speed of 4000r / min for 1.5min, stop stirring, hydrate for 8min, then slowly add 235 parts of weighting agent, and then add 8 1 part of fluid loss reducer, 6 parts of cleaning agent, 2 parts of retarder and 22 parts of sodium chloride, mix well and then stir at 2000r / min for 1min, finally add 0.3 part of defoamer, stir evenly to get the density 2.20g / cm 3 High-temperature and salt-resistant high-density spacer fluid.

[0032] Among them, the weighting agent consists of 215 parts with an average particle size of 100 μm and a density of 5.05 g / cm 3Iron ore powder and 20 parts with an average particle size of 1.6μm and a density of 5.05g / cm 3 The micro manganese composition; the defoamer is a mixture of simethicone oil and tributyl phosphate in a weight ratio of 1:0.3.

Embodiment 3

[0034] First, slowly add 1.4 parts of suspension stabilizer to 100 parts of water, mix evenly, stir in a Waring mixer at a speed of 4000r / min for 1.5min, stop stirring, hydrate for 8min, then slowly add 270 parts of weighting agent, and then add 8 parts of fluid loss reducer, 7 parts of cleaning agent, 2 parts of retarder and 36 parts of sodium chloride, after mixing evenly, stir at a speed of 2000r / min for 1min, and finally add 0.4 parts of defoamer, stir evenly, and get The density is 2.40g / cm 3 High-temperature and salt-resistant high-density spacer fluid.

[0035] Among them, the weighting agent consists of 90 parts with an average particle size of 100 μm and a density of 5.0 g / cm 3 Iron ore powder, 160 parts with an average particle size of 140μm and a density of 7.0g / cm 3 Iron ore powder and 20 parts with an average particle size of 1.4μm and a density of 5.05g / cm 3 The micro manganese composition; the defoamer is a mixture of simethicone oil and tributyl phosphate in...

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Abstract

The invention discloses a high-temperature-resistant and salt-tolerant spacer fluid with high density and a preparation method of the spacer fluid. The spacer fluid is prepared from solvent water, a suspension stabilizer, a cleaning agent, a fluid loss agent, a retarder, a defoamer, a weighting agent and sodium chloride, wherein the suspension stabilizer is prepared from natural mineral, modified diutan gum, a polymer, inorganic salt and white carbon black; the weighting agent is prepared from iron ore powder and micro-Mn in a weight ratio being 1:(0.05-0.20). The preparation method of the spacer fluid is simple, the suspension stabilizer is added to water slowly, hydration is performed for 5-10 min after high-speed stirring is performed for 1-2 min, then the weighting agent, the fluid loss agent, the cleaning agent and the retarder are added slowly in sequence, the mixed solution is stirred rapidly for 1-2 min, finally, the defoamer is added and uniformly stirred, and preparation is completed. The application temperature range of the high-temperature-resistant and salt-tolerant spacer fluid with high density is 30-190 DEG C, the density is adjustable in a range of 2.00-2.80 g / cm<3>, and the spacer fluid reaches saturation for salt tolerance; the spacer fluid has the advantages of little free water in a system, small fluid loss amount, high fluidity, good slurry stability and the like.

Description

technical field [0001] The invention relates to the technical field of prefluid for petroleum cementing engineering, in particular to a high-temperature-resistant, salt-resistant, high-density spacer fluid and a preparation method thereof. Background technique [0002] With the continuous deepening of exploration and development, there are more and more deep wells, ultra-deep wells, extended-reach horizontal wells, and adjustment wells, and the density of drilling fluid is getting higher and higher. Tie. At present, the density of mud used in Iraq's Halfaya and Missan blocks reaches 2.20g / cm 3 Above, and containing salt paste layer, in order to improve the displacement efficiency, it is necessary to adopt the anti-salt high-density spacer fluid system. The currently used high-density spacers use materials such as cellulose and xanthan gum as suspension stabilizers, and the suspension ability becomes weak at high temperatures, and the suspension ability is limited at high d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/40
CPCC09K8/40
Inventor 齐奔林志辉刘文明王浪夏斌王翔宇付家文梁悦朱禹于倩倩宗勇肖尧王芳辛霞孙勤亮
Owner BC P INC CHINA NAT PETROLEUM CORP
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