Cleaning agent for heat cleaning of wellhole and preparation method thereof

A cleaning agent and hot washing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of downhole equipment blockage, poor well washing effect, single function of well washing fluid, etc., to prevent re-adsorption, Perfect compatibility performance, superior use effect

Inactive Publication Date: 2013-01-30
CNOOC ENERGY TECH & SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diesel oil is only a good organic solvent, and its main function is to soak and clean the organic matter in the formation or wellbore. Moreover, diesel oil soaks and washes the well for a long time, and the well washing effect is not good, wasting energy and polluting the environment.
[0003] The thermal washing process technology is different from diesel oil well washing. Although ther

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A cleaning agent for wellbore thermal cleaning, its composition and weight are:

[0033] Neal 10g;

[0034] Penetrant JFC 1g;

[0035] Demulsifier AE8031 1g;

[0036] Ethylene glycol monobutyl ether 10g;

[0037] HEDTA 5g;

[0038] 30g of water.

[0039] The preparation method of the cleaning agent for hot washing of the above-mentioned wellbore, the steps are as follows:

[0040] ⑴ Dissolve 10g HEDTA in 30g water and stir until completely dissolved;

[0041] ⑵Add 10g of ethylene glycol monobutyl ether to the solution in step ⑴, stir evenly, then add 10g of Nisal, 1g of penetrant JFC and 1g of demulsifier AE8031 in turn, stir evenly to obtain the product.

[0042] Determination of well cleaning effect of cleaning agent for hot wellbore cleaning:

[0043] On-site application procedures:

[0044] 1. Connect the ground circulation pipeline, and test whether the mud pump and heating vehicle are running normally;

[0045] 2. Smashing the oil drain valve or steel wir...

Embodiment 2

[0059] A cleaning agent for hot wellbore cleaning and a preparation method thereof, the components and parts by weight of which are:

[0060] Neal 20g;

[0061] Penetrant JFC 5g;

[0062] Demulsifier AE8031 2.5g;

[0063] Ethylene glycol monobutyl ether 20g;

[0064] HEDTA 9.5g;

[0065] 43g of water.

[0066] The preparation method of the cleaning agent for hot washing of the above-mentioned wellbore, the steps are as follows:

[0067] (1) Dissolve 9.5g of HEDTA in 43g of water and stir until completely dissolved;

[0068] ⑵Add 20g of ethylene glycol monobutyl ether to the solution in step ⑴, stir evenly, then add 20g of Nisal, 5g of penetrant JFC and 2.5g of demulsifier AE8031 in turn, stir evenly to obtain the product.

[0069] On-site application procedures are the same as in Example 1.

[0070] See Table 2 for the results of wellbore hot washing with cleaning agent:

[0071] Table 2 Well washing results with cleaning agent for hot wellbore washing

[0072] ...

Embodiment 3

[0076] A cleaning agent for wellbore thermal cleaning, its composition and parts by weight are:

[0077] Neal 30g;

[0078] Penetrant JFC 10g;

[0079] Demulsifier AE8031 5g;

[0080] Ethylene glycol monobutyl ether 30g;

[0081] HEDTA 15g;

[0082] 50g of water.

[0083] The preparation method of the cleaning agent for hot washing of the above-mentioned wellbore, the steps are as follows:

[0084] ⑴ Dissolve 15g HEDTA in 50g water and stir until completely dissolved;

[0085] ⑵Add 30g of ethylene glycol monobutyl ether to the solution in step ⑴, stir evenly, then add 30g of Nisal, 10g of penetrant JFC and 5g of demulsifier AE8031 in turn, stir evenly to obtain the product.

[0086] On-site application procedures are the same as in Example 1.

[0087] See Table 3 for the results of wellbore hot washing with cleaning agent:

[0088] Table 3 Well washing results with cleaning agent for hot wellbore washing

[0089] well number

[0090] 2

[0091] I...

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PUM

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Abstract

The invention relates to a cleaning agent for heat cleaning of wellhole. The cleaning agent comprises the following components, by weight: 10-30 parts of Ninol, 1-10 parts of a penetrating agent JFC, 1-5 parts of a demulsifier AE8031, 10-30 parts of ethylene glycol monobutyl ether; 5-15 parts of HEDTA and 30-50 parts of water. The preparation method comprises the steps of: (1) dissolving HEDTA in water, and stirring until complete dissolving; and (2) adding ethylene glycol monobutyl ether into the solution from the step (1), stirring evenly, successively adding Ninol, penetrating agent JFC and demulsifier AE8031, and stirring evenly to obtain a finished product. The components of Ninol, penetrating agent JFC, demulsifier AE8031 and ethylene glycol monobutyl ether in the cleaning agent are all surfactants; HEDTA has descaling and scale inhibition function, so that the cleaning agent provided by the invention has the functions of surface activity, descaling and scale inhibition, and is suitable for cleaning of oil tubes in heavy oil heavy oil fields, and also has the function of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and relates to an oil well cleaning agent, in particular to a cleaning agent for wellbore thermal cleaning and a preparation method thereof. Background technique [0002] During the production process of the oil well, asphalt, wax and other substances will slowly adsorb on the outside of the oil pipe to form oil scale. For heavy heavy oil, this situation is more serious. During the workover operation, in order to prevent the oil from spilling onto the sea surface due to the lifting of the tubing, the well washout operation is often performed before the workover. Offshore oilfields carry out well washing operations, mainly through diesel oil soaking and geothermal water backwashing. However, diesel oil is only a good organic solvent, and its main function is to soak and clean the organic matter in the formation or wellbore. Moreover, diesel oil takes a long time t...

Claims

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Application Information

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IPC IPC(8): C09K8/524
Inventor 车连发王向勇高永华甄宝生赵德喜包伟宿辉肖峰
Owner CNOOC ENERGY TECH & SERVICES
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