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Salt-tolerant latex cement slurry for well cementation

A cement slurry and salt-resistant technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of ordinary latex cement slurry not being resistant to salt and restricting the use of latex cement slurry, so as to reduce the transportation burden and reduce the operation cost effect

Inactive Publication Date: 2011-06-15
CNPC OFFSHORE ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary latex cement slurry is not salt-tolerant, and demulsifies due to salting out in brine, which limits the use of latex cement slurry in complex wells in salt-bearing rock formations (salt formations, salt-gypsum formations, brine formations); in addition, seawater High-valent ions such as calcium and magnesium ions and sodium chloride in the latex make the latex demulsify and cause flocculation. Therefore, ordinary latex cement slurry systems cannot be prepared with seawater

Method used

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  • Salt-tolerant latex cement slurry for well cementation
  • Salt-tolerant latex cement slurry for well cementation
  • Salt-tolerant latex cement slurry for well cementation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Measure the components of the salt-resistant grout according to Table 2, prepare the salt-resistant latex grout according to GB / T 19139-2003, and conduct the performance test of the grout. The G-grade cement in Table 2 is the high sulfur resistance (HSR) G-grade cement produced by Sichuan Jiahua Enterprise (Group) Co., Ltd.; the silica fume is produced by Tianjin Yanshan Superfine Mineral Powder Factory; Produced by Star Engineering Technology Co., Ltd.; AMPS-containing polymer fluid loss reducer is BXF-200L produced by Tianjin Zhongyou Boxing Engineering Technology Co., Ltd.; 1-hydroxyethylidene-1,1-diphosphoric acid is produced by Shandong Heli Water Treatment Co., Ltd. Production; polycondensation products of naphthalene sulfonate and formaldehyde, aldehyde and ketone condensation products are produced by Tianjin Red Sun Chemical Co., Ltd., trade names are UNF and USZ respectively; phosphate defoamer is Changhao Trading Co., Ltd., Shunde District, Foshan Cit...

Embodiment 2

[0018] Embodiment 2 Measure each component of the salt-tolerant cement slurry according to Table 3, prepare the salt-tolerant latex cement slurry according to GB / T 19139-2003 and carry out the cement slurry performance test. The experimental results are shown in Table 3: Table 3 Salt-tolerant latex cement slurry formula and performance Note: c: See No. 7 in Table 1 for the composition of salt-tolerant latex; d: See No. 9 in Table 1 for the composition of salt-tolerant latex.

[0019] For the comparison example, take the salt-tolerant latex cement slurry marked with * in Table 3, draw its thickening curve, and compare it with the thickening curve of ordinary latex cement slurry. The results are shown in figure 1 and figure 2 .

[0020] Depend on figure 1 It can be seen from the figure that the thickening curve of ordinary latex cement slurry has "bulging phenomenon", and the cement slurry cannot be pumped if the consistency is greater than 70Bc, thus endangering the safety...

Embodiment 3

[0021] Embodiment 3 Measure each component of cement slurry according to Table 4, prepare seawater latex cement slurry according to GB / T 19139-2003 and carry out cement slurry performance test, the experimental results are shown in Table 4: latex cement slurry and performance of table 4 seawater mixing slurry Note: e: For the composition of salt-tolerant latex, see Table 1, No. 10; f: For the composition of salt-tolerant latex, see Table 1, No. 11.

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Abstract

The invention discloses salt-tolerant latex cement slurry for well cementation, which comprises the following components: cement, salt tolerant latex which is 4-40% of weight of cement, water-loss control agent which is 3-4% of weight of cement, slow-release agent which is 0-2% of weight of cement, dispersant which is 0.5-3% of weight of cement, saline or seawater with concentration not higher than 15% which is 18-51% of weight of cement, and antifoaming agent which is 0.5-1.3% of weight of cement. The salt-tolerant latex cement slurry provided by the invention overcomes the shortcoming that ordinary latex is not salt tolerant, so that the salt-tolerant latex cement slurry system can be used for cementing a complex well with a salt bearing rock formation (salt formation, salt and gypsum formations, saltwater formation). In addition, the salt-tolerant latex cement slurry provided by the invention can be also directly prepared from seawater, so as to reduce the fresh water transportation load of well cementing operation in an offshore drilling platform, and reduce operation cost.

Description

technical field [0001] The invention relates to a latex cement slurry system for oil and gas well cementing, in particular to a salt-resistant latex cement slurry. Background technique [0002] The latex cement slurry system has been widely used in the cementing of difficult wells such as extended reach wells, branch wells, highly deviated wells, adjustment wells and slim hole wells, etc., to improve the ability of the cement slurry to prevent gas channeling and control water loss, and at the same time improve The bonding performance, toughness and corrosion resistance of cement stone. However, ordinary latex cement slurry is not salt-tolerant, and demulsifies due to salting out in brine, which limits the use of latex cement slurry in complex wells in salt-bearing rock formations (salt formations, salt-gypsum formations, brine formations); in addition, seawater High-valent ions such as calcium and magnesium ions and sodium chloride in the latex cause latex demulsification a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 曾建国吕光明孙富全高永会侯薇
Owner CNPC OFFSHORE ENG
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