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Dissolving agent, and application thereof in dissolving well cementation sliding sleeve

A technology of dissolving agent and content, applied in wellbore/well components, drilling composition, earth-moving drilling, etc., can solve problems such as affecting piston opening holes and cement residues

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cementing sleeves often open the holes by pressurizing the oil / casing, pushing the piston down, and shearing the pins to achieve the purpose of connecting the oil / casing and the formation. Therefore, the cementing sleeve tool will reserve the piston to go down. In the cementing operation, a large amount of cement slurry will flow through this space, resulting in some cement residues, which will affect the downward movement of the piston to open the hole

Method used

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  • Dissolving agent, and application thereof in dissolving well cementation sliding sleeve
  • Dissolving agent, and application thereof in dissolving well cementation sliding sleeve
  • Dissolving agent, and application thereof in dissolving well cementation sliding sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 87 parts by mass of clear water, 8 parts by mass of ammonium chloride, 2 parts by mass of citric acid, and 3 parts by mass of aluminum sulfate, add aluminum sulfate to the clear water under stirring, add citric acid and ammonium chloride after the complete dissolution of aluminum sulfate, and continue Stir until completely dissolved, reconstitute to form a solvent.

[0020] Mix the dissolving agent with the cement slurry (grade G cement for oil and gas well cementing, the water-cement ratio is 0.44, the same as in the following examples) at a volume ratio of 2:8 to obtain formula 1#. The cement slurry without dissolving agent was used as blank control D#.

[0021] Refer to the standard GB / T 19139-2012 "Test Methods for Oil Well Cement" to measure the thickening time (test temperature 38°C, test pressure 20MPa), the results are shown in Table 1.

[0022] It can be seen from Table 1 that the thickening time of 1# to 70BC increases from 210 minutes of the blank sa...

Embodiment 2

[0030] Measure 86.5 parts by mass of clear water, 8 parts by mass of ammonium chloride, 2 parts by mass of citric acid, and 3.5 parts by mass of magnesium sulfate, add magnesium sulfate to the clear water under stirring, add citric acid and ammonium chloride after the magnesium sulfate is completely dissolved, and continue Stir until completely dissolved, reconstitute to form a solvent.

[0031] Mix the dissolving agent with the cement slurry at a volume ratio of 2:8 to obtain formula 2#. The cement slurry without dissolving agent was used as blank control D#.

[0032] The assay method of thickening time is the same as in Example 1, and the results are shown in Table 3.

[0033] It can be seen from Table 3 that the thickening time to reach 70BC increases from 210 minutes of the blank sample to 600 minutes, and the sample is moderately retarded, and can be solidified after a certain period of time, so the cementing operation will not be affected.

[0034] Table 3 Variation of...

Embodiment 3

[0041] Measure 86.5 parts by mass of clear water, 8 parts by mass of ammonium chloride, 2 parts by mass of citric acid, 2.5 parts by mass of aluminum sulfate, and 1 part by mass of magnesium sulfate. After complete dissolution, add citric acid and ammonium chloride and continue to stir until completely dissolved to form a dissolving agent.

[0042] Mix the dissolving agent with the cement slurry at a volume ratio of 2:8 to obtain formula 3#. The cement slurry without dissolving agent was used as blank control D#.

[0043] The assay method of thickening time is the same as in Example 1, and the results are shown in Table 5.

[0044] It can be seen from Table 5 that the thickening time to reach 70BC increases from 210 minutes of the blank sample to 510 minutes, and the sample is moderately retarded, and can be solidified after a certain period of time, so the cementing operation will not be affected.

[0045] Table 5 Variation of thickening time after dissolving agent is mixed...

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Abstract

The invention provides a dissolving agent, and application thereof in dissolving a well cementation sliding sleeve. The dissolving agent comprises acid, haloid, sulfate and water, and the acid is at least one of citric acid, tartaric acid and orthophosphoric acid; the haloid is at least one of ammonium chloride, potassium chloride, sodium chloride and magnesium chloride; and the sulfate is aluminum sulfate and / or magnesium sulfate.

Description

technical field [0001] The invention provides a dissolving agent, especially its application in dissolving a cementing sliding sleeve. Background technique [0002] The cementing sliding sleeve has the advantages of unlimited stages of staged fracturing and completion technology, large fracturing scale, large construction displacement, and no need for perforating plugs. It is of great importance for the profitable development of low permeability oil and gas fields and shale gas. significance. [0003] Cementing sleeves often open the holes by pressurizing the oil / casing, pushing the piston down, and shearing the pins to achieve the purpose of connecting the oil / casing and the formation. Therefore, the cementing sleeve tool will reserve the piston to go down. In the cementing operation, a large amount of cement slurry will flow through this space, resulting in some cement residue, which will affect the downward movement of the piston to open the hole. One of the sliding sle...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/467E21B33/13C04B22/16C04B24/06C04B103/22
CPCC09K8/528C09K8/467E21B33/13C04B40/0039C04B2103/22C04B22/124C04B22/148C04B24/06C04B22/142Y02W30/91
Inventor 兰林刘多容林永茂雷炜潘宝风慈建发杨丽杨东梅李洪波周建伟王春生
Owner CHINA PETROLEUM & CHEM CORP