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Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing

An anti-gas channeling and pre-washing technology, which is applied in sealing/package, earthwork drilling, wellbore/well components, etc., can solve the problems of cement slurry weight loss, delay the time of weight loss, prevent lost circulation, and improve displacement efficiency Effect

Active Publication Date: 2013-07-10
DAQING PETROLEUM ADMINISTRATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Method used

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  • Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing
  • Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1. This method is applied to well Puqian 189-14.

[0017] 1) Surface Table 3

[0018] name

Density (g / cm 3 )

Design consumption (m 3 )

Actual consumption (m 3 )

Spacer (water)

1.0

2.0

2.0

prewashed grout

1.80

5

6

G grade puree (0~60m)

1.90

4.5

32

Grade G+4.0%DSK(60-136m)

1.90

5.7

27

[0019] 2) Oil layer Table 4

[0020] name

Embodiment 2

[0021] Example 2, this method is applied to Puqian 205-20

[0022] 1) Surface Table 5

[0023] name

Density (g / cm 3 )

Design consumption (m 3 )

Actual consumption (m 3 )

Spacer (water)

1.0

2.0

2.0

prewashed grout

1.80

5

6

G grade puree (0~60m)

1.90

4.5

27

Grade G+4.0%DSK(60-136m)

1.90

5.7

27

[0024] 2) Oil layer Table 6

[0025] name

Embodiment 3

[0026] Example 3, this method is applied to Puqian 205-10

[0027] 1) Surface Table 7

[0028] name

Density (g / cm 3 )

Design consumption (m 3 )

The actual amount

(m 3 )

Spacer (water)

1.0

2.0

2.0

prewashed grout

1.80

5

6

G grade puree (0~60m)

1.90

4.5

28

Grade G+4.0%DSK(60-136m)

1.90

5.7

28

[0029] 2) Oil layer Table 8

[0030] name

Density (g / cm 3 )

Design consumption (m 3 )

Actual consumption (m 3 )

Spacer (water)

1.0

1.5

1.5

DZG flushing isolation fluid

1.50

5.0

5.0

prewashed grout

1.80

6

7.5

No. 1 cement slurry (ground-420m)

1.63

17

18.5

No. 2 cement slurry (420m-1200m)

1.92

26

26.5

[0031] In the construction of Well Puqian 189-14, Well Puqian 205-10 and Well Puqian...

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Abstract

The invention discloses a method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing, which comprises the following steps of: (1) injecting cement paste prepared from G-stage cement at 0-60m of a surface layer; (2) injecting cement paste prepared from the G-stage cement, a DSK water-locking channeling prevention agent and water at 60-136m of the surface layer; (3) injecting cement paste prepared from the G-stage cement, glass beads, micro-silica, a DSJ filtrate reducer, the DSK water-locking channeling prevention agent and water at 0-390m, at 401mor 420m of an oil layer; and (4) injecting cement paste prepared from the G-stage cement, 1.0 percent of DSJ filtrate reducer, 5.0 percent of DSK water-locking channeling prevention agent and water at 390m, 401m or 420-900m, 1,020m or 1200m of the oil layer. The method has good blocking effect and obvious effect of preventing gas channeling in a shallow gas region, and obviously improves the wellcementing quality.

Description

Technical field: [0001] The invention relates to the technical field of well completion and cementing in drilling engineering, in particular to a method for pre-washing, multi-density, double-condensation, long-seal and anti-gas channeling cementing. Background technique: [0002] The anti-gas channeling cementing technology was gradually developed abroad in the 1980s. It mainly started from two aspects of cementing cement additives and mechanical plugging. It was mainly used in cementing high-risk gas wells and deep gas wells abroad, and the cost was extremely high. In China, it mainly solves the problem of preventing gas channeling encountered in the cementing of deep gas wells. [0003] For gas wells, the difficulty in cementing construction is how to prevent the gas from the production layer from moving up, and pressure stability is the key point. There are three ways for annular air channeling: 1) Cement slurry channeling due to low displacement efficiency. Due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/138
Inventor 张海山李国庆孙全俊韩昌郭孝平周彬
Owner DAQING PETROLEUM ADMINISTRATION
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