CN103740349B - High temperature resistance consolidation type sealing agent - Google Patents

Abstract

A high-temperature-resistant consolidation plugging agent, the composition and content of which are in parts by weight: calcium carbonate 30-40; G grade oil well cement 3-5; temperature-resistant and salt-resistant clay 10-20; hydroxyethyl cellulose 0.5-3 ; polyanionic cellulose 0.1-1; sulfonated tannin 0.5-3; sulfonated lignite 0.5-3; sulfonated phenolic resin SMP-2 1-5. Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix for 5-6 hours at normal pressure and 55-60°C, then add them to the dryer, wait for them to dry, and grind them into powders of 0.01mm-0.3mm products. The invention has strong high temperature resistance, good fluidity, high plugging rate, strong coagulation performance, wide source of raw materials, scientific and simple process, safe construction, and is widely used in high-temperature deep wells and geothermal development wells in petroleum and geological drilling. Application in well plugging engineering.

Description

Anti-high temperature consolidation plugging agent

technical field

The invention relates to a lost circulation plugging agent for well drilling, in particular to a high temperature resistant and solidified lost circulation plugging agent.

Background technique

When oil drilling encounters lost sections in high-temperature formations, because there is no high-temperature resistant plugging technology, conventional plugging agents are generally used for plugging. Although the conventional plugging method has played a role in the plugging project of oil drilling, it also has the following shortcomings or deficiencies: ① low high temperature resistance, short validity period, and poor plugging efficiency; ② high temperature is easy to degrade, and the plugging effect is poor; ③ The plugging material consumes a lot, and the plugging time is long; ④It has a certain effect on the plugging of medium and low temperature lost zones, but it cannot solve the problem of plugging in high-temperature deep wells and geothermal wells; ⑤Loop plugging in high-temperature deep wells and geothermal wells , The plugging safety factor is poor, and downhole complex situations are prone to occur, which directly affects the drilling and development process of high-temperature wells and geothermal wells.

Contents of the invention

The purpose of the present invention is to provide a high-temperature-resistant and solidified plugging agent, which is prepared by combining various inorganic materials, organic polymers and high-temperature and high-temperature-resistant solidified materials. After the plugging is condensed, it has high strength and high temperature resistance. Less volume reduction, no degradation, can improve the pressure bearing capacity of the high-temperature leakage formation while plugging the high-temperature leakage formation, effectively overcome or avoid the shortcomings or deficiencies in the above-mentioned prior art.

The composition and content of the anti-high temperature consolidation type plugging agent of the present invention, the content is in parts by weight:

Calcium carbonate 30-40; G-grade oil well cement 3-5; temperature-resistant and salt-resistant clay 10-20; hydroxyethyl cellulose 0.5-3; polyanion cellulose 0.1-1; sulfonated tannin 0.5-3; sulfonated Lignite 0.5-3; sulfonated phenolic resin SMP-2 1-5.

Preparation method: Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix them for 5-6 hours at normal pressure and 55-60°C, then add them to the desiccator, wait for them to dry, and grind them into 0.01mm-0.3 mm powder products.

Compared with the existing leakage stoppage agent, the present invention has the following advantages or beneficial effects:

1. It has good temperature resistance and consolidation ability, and the temperature resistance can reach 180-200 °C;

2. Good thermal stability, high strength, long validity period and good plugging effect.

3. It has a certain expansion performance, the volume does not shrink, and free water does not come out.

4. It is not easy to degrade and deform under high temperature conditions, and can maintain the original strength to ensure the success rate of plugging.

5. Good compatibility, good fluidity under high temperature conditions, can stay in the high temperature leakage channel, avoiding repeated leakage under high temperature conditions.

6. Suitable for high temperature deep well and geothermal well plugging construction,

7. It is non-toxic, non-polluting to the environment, safe in operation, can ensure continuous construction, and will not cause complicated underground accidents.

detailed description:

A kind of anti-high temperature consolidation type plugging agent, its composition and content, the content is by weight:

Calcium carbonate 30-40; G-grade oil well cement 3-5; temperature-resistant and salt-resistant clay 10-20; hydroxyethyl cellulose 0.5-3; polyanion cellulose 0.1-1; sulfonated tannin 0.5-3; sulfonated Lignite 0.5-3; sulfonated phenolic resin SMP-2 1-5.

Preparation method: Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix them for 5-6 hours at normal pressure and 55-60°C, then add them to the desiccator, wait for them to dry, and grind them into 0.01mm-0.3 mm powder products.

When in use, 2%-15% of the total amount of the plugging drilling fluid is added to the lost circulation drilling fluid, and the high temperature resistant consolidation type lost circulation agent of the present invention is added.

Provide specific embodiment below:

Case 1

Calcium carbonate 30; G-grade oil well cement 3; temperature-resistant and salt-resistant clay 10; hydroxyethyl cellulose 0.5; polyanionic cellulose 0.1; sulfonated tannin 0.5; sulfonated lignite 0.5; Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix them at normal pressure and 55°C for 5 hours, then add them to the desiccator, wait for them to dry, and grind them into 0.01mm powder products.

When in use, 2% of the total amount of the plugging drilling fluid is added to the lost circulation drilling fluid of the high temperature resistant consolidation type lost circulation agent of the present invention.

Case 2

Calcium carbonate 33; G-grade oil well cement 3.5; temperature-resistant and salt-resistant clay 14; hydroxyethyl cellulose 1; polyanionic cellulose 0.5; sulfonated tannin 1; sulfonated lignite 1;

Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix at normal pressure and 57°C for 5.5 hours, then add them to the desiccator, wait for them to dry, and grind them into 0.1mm powder products.

When in use, add the high temperature resistant consolidation type lost circulation agent of the present invention in the lost circulation drilling fluid of 8% of the total amount of the lost circulation drilling fluid.

Case 3

Calcium carbonate 40; G-grade oil well cement 5; temperature-resistant and salt-resistant clay 20; hydroxyethyl cellulose 3; polyanionic cellulose 1; sulfonated tannin 3; sulfonated lignite 3;

Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix them at normal pressure and 60°C for 6 hours, then add them to the desiccator, wait for them to dry, and grind them into 0.3mm powder products.

When in use, add the anti-high temperature consolidation type lost circulation agent of the present invention in the lost circulation drilling fluid of the total amount of 15% of the lost circulation drilling fluid

Case 4

Calcium carbonate 36; G grade oil well cement 4; temperature-resistant and salt-resistant clay 16; hydroxyethyl cellulose 2; polyanionic cellulose 0.8; sulfonated tannin 2; sulfonated lignite 2;

Add the above-mentioned substances into the reaction kettle in sequence according to their components and contents, stir and mix them at normal pressure and 58°C for 5 hours, then add them to the desiccator, wait for them to dry, and grind them into 0.2mm powder products.

When in use, add the high temperature resistant consolidation type lost circulation agent of the present invention in the lost circulation drilling fluid with a total amount of 12% of the lost circulation drilling fluid.

The first example, the second example and the third example are examples, and the fourth example is a comparative example, which has a good plugging effect in field use.

Claims (1)

1. a high temperature resistance consolidation type sealing agent, its composition and content, content is weight portion:

Calcium carbonate 30-40

G level oil-well cement 3-5

Heat and salinity tolerance clay 10-20

Hydroxyethyl cellulose 0.5-3

Polyanion cellulose 0.1-1

Sulfonation tannin 0.5-3

Sulfonated lignite 0.5-3

Sulfonated phenolic resin SMP-2 1-5；

Compound method: be sequentially added in reactor by its component and content by above-mentioned substance, in normal pressure, 55-60 DEG C of condition stirring Mix 5-6 hour, be subsequently adding in exsiccator, treat that it dry, pulverize into 0.01mm-0.3mm powdered preparations.