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Well-cementing waterproof gel

A water-blocking and gel technology, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of not blocking water flow and can not use water-blocking effect, etc., and achieves easy pumping, high strength and stability. Good results

Inactive Publication Date: 2017-05-24
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned gel does not have the performance of blocking water flow and being compatible with cement slurry, and can only be used for water plugging and profile control and precipitation and oil increase in the production process, and cannot be used for water isolation in the cementing process

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0024] The present invention has no special limitation on the preparation method of each cementing hydrogel, and the method of mixing materials well known to those skilled in the art can be used. In the present invention, the preparation method of the cementing water-isolation gel preferably includes the following steps:

[0025] (1) mixing the crosslinking glue with the first part by weight of water to obtain a crosslinking glue solution;

[0026] (2) Mix the cross-linking gel solution in the step (1) with the cross-linking agent and the remaining parts by weight of water, and perform a cross-linking reaction to obtain a cementing water-isolation gel.

[0027] In the present invention, water is preferably added as a solvent in different batches. In the present invention, there is no special limitation on the adding batches of the water, which can be adjusted according to the adding of raw materials. In the present invention, the first weight part of water is preferably 50-9...

Embodiment 1

[0036] Raw materials: 1 part by weight of cross-linking glue; 1 part by weight of cross-linking liquid; 98 parts by weight of water.

[0037] The cross-linking gum is prepared from the following components in mass content: 80% xanthan gum and 20% guar gum.

[0038] The cross-linking liquid is prepared from the following components in mass content: 3% of borax and 97% of water.

[0039] 1) Prepare the cross-linking liquid for use;

[0040] 2) Import a certain amount of water into the reactor, and turn on the stirring;

[0041] 3) Slowly add the cross-linking gel while stirring, and stir for 2-3 hours to fully dissolve the cross-linking gel;

[0042] 4) Add the cross-linking liquid and mix evenly to obtain the cementing water-separating gel.

[0043] The performance test of the cementing water-separating gel prepared in this example was carried out according to the following method, and the results obtained are shown in Tables 1-5 respectively.

[0044] Evaluation method of ge...

Embodiment 2

[0050] Raw materials: 1 part by weight of cross-linking glue; 1 part by weight of cross-linking liquid; 97.9 parts by weight of water.

[0051] The cross-linking gum is formulated from the following components: Xanthan gum.

[0052] The cross-linking solution is prepared from the following components in mass content: 5% of borax and 95% of water.

[0053] According to the method of Example 1, the well cementing water-separating gel was prepared.

[0054] The performance test of the cementing water-separating gel prepared in this example was carried out according to the method described in Example 1, and the results obtained are shown in Tables 1-5 respectively.

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Abstract

The invention provides well-cementing waterproof gel which comprises, by weight parts, 0.5-1 part of crosslinking glue, 0.001-0.1 part of crosslinking agent, and the balance water. The crosslinking glue comprises xanthan gum. The crosslinking glue comprising the xanthan gum is taken as a raw material; and through an effect of the crosslinking agent, the obtained well-cementing waterproof gel is good in waterproof performance and has very good compatibility with cement paste. Experimental results indicate that the water filter loss of the well-cementing waterproof gel under the pressure of 3.5 MPa for 5 min is 0, and the well-cementing waterproof gel has no influence on densification time and strength of the cement paste after being mixed with the cement paste according to different proportions.

Description

technical field [0001] The invention relates to the technical field of oil and gas engineering, in particular to a cementing water-isolation gel. Background technique [0002] Cementing is the process of injecting cement slurry into the annular space between the well wall and the casing, the purpose of which is to isolate and support and protect the casing between layers. The quality of cementing is directly related to the life of oil and gas wells and the protection of resources, so all aspects of cementing operations must be fully considered. Due to the unpredictability of the formation during the drilling process, groundwater layers, underground rivers or caves may be encountered during the drilling process. The surging water flow in the formation can easily disperse the cementing slurry, resulting in the failure of the cementing operation. During cementing construction, if the cement slurry is in direct contact with water flow or drilling fluid, the cement slurry will b...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/422C09K8/467
Inventor 许明标游云武王晓亮杨洋
Owner YANGTZE UNIVERSITY
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