High-temperature-resistant and salt-tolerant spacer fluid with high density and preparation method of spacer fluid

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 slurry good stability effect

Active Publication Date: 2017-11-07
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, an

Method used

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  • High-temperature-resistant and salt-tolerant spacer fluid with high density and preparation method of spacer fluid
  • High-temperature-resistant and salt-tolerant spacer fluid with high density and preparation method of spacer fluid
  • High-temperature-resistant and salt-tolerant spacer fluid with high density and preparation method of spacer fluid

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

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

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

Example Embodiment

[0030] Example 2

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

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

Example Embodiment

[0033] Example 3

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

[0035] Among them, the weighting agent consists of 90 parts with an average particle size of 100μm and a density of 5.0g / cm 3 Of iron ore powder, 160 parts with an average particle size of 140μm and a density of 7.0g / cm 3 Of iron ore powder and 20 parts with an average particle size of 1.4μm and a density of 5.05g / cm 3 The defoamer is a mixture of dimethyl silicone oil and tributyl phosphate with a weight ratio of 1:0.3.

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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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IPC IPC(8): C09K8/40
CPCC09K8/40
Inventor 齐奔刘文明付家文林志辉孙勤亮于倩倩宗勇肖尧王芳辛霞
Owner BC P INC CHINA NAT PETROLEUM CORP
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