CN115806806A - Drilling fluid stuck releasing agent based on vermicular micelle acid and preparation method and use method thereof - Google Patents

Abstract

The invention relates to the technical field of stuck freeing agents for drilling, in particular to a stuck freeing agent for drilling fluid based on wormlike micellar acid, a preparation method and a use method thereof, wherein the stuck freeing agent comprises the following components in percentage by mass: 75.96-75.63% of vermicular micelle acid, 6.33-6.72% of penetrating agent, 5.06-5.04% of chelating agent and 12.66-12.61% of deionized water. According to the invention, firstly, the vermicular micelle is synthesized by alkyl trimethyl ammonium bromide and salicylic acid, and the composite invisible acid is embedded in the vermicular micelle, so that the micellar acid does not have any adverse effect on a drilling tool during the process of going into a well; the vermicular viscosity is extremely high, the micelle acid can be stabilized at a drilling clamping layer, and the action efficiency is increased. After entering a drilling stuck layer, in the standing period, due to the action of a penetrant, the composite invisible acid in the worm micelle rapidly enters a stuck point, the composite invisible acid reacts to generate hydrogen radical ions at a stable rate, and rocks are effectively corroded; meanwhile, the formula also contains a chelating agent, and the chelating agent can assist in chelating and corroding rocks under the action of the chelating agent.

Description

Drilling fluid stuck releasing agent based on vermicular micelle acid and preparation method and use method thereof

Technical Field

The invention relates to the technical field of a drilling stuck freeing agent, in particular to a sticking freeing agent for drilling fluid based on wormlike micellar acid, a preparation method and a use method thereof.

Background

At present, as oil and gas exploration and development are gradually developed to complex strata, drilling is increasingly complicated, particularly the problem of instability and collapse of well walls is increasingly serious, and drilling accidents caused by the instability and collapse are also increasingly serious. If the drilling tool meets loose stratum and the drilling fluid leakage is too large, the sticking and drilling tool jamming accidents can occur. Once a drilling stuck accident happens, the drilling construction period can be seriously influenced, even the condition of burying the drill bit occurs, and finally the well sidetracking has to be filled. Therefore, it is necessary to adopt a proper method to deal with the stuck drilling accident. At present, the adopted methods comprise a physical method and a chemical method, wherein the physical method mainly comprises a vibration impact method, a casing milling method and a continuous hydraulic method, but the three methods have strong destructiveness on a drill tool, and if the methods are implemented in a fragmental or weakly cemented stratum, the problems of new borehole wall instability and secondary drilling stuck accidents can be caused. Therefore, physical methods are generally not recommended for unfreezing. The chemical method mainly adopts three methods of oil soaking, acid soaking and stuck freeing liquid, and at present, the oil soaking method has slowly exited the historical stage because the oil phase adopted by the method is mainly diesel oil which has great influence on the environment, and the method is greatly limited at present when the environmental protection is increasingly strict. The pickle acid also presents environmental problems, it can harden the soil by acidification, and in addition, the strong acid can cause greater corrosion of the drilling tool. Therefore, the conventional unfreezing method is still a foaming unfreezing agent, the conventional unfreezing agent mainly contains a lubricant, a wetting reversal agent and a corrosion inhibitor, and some acid substances are sometimes added, but the unfreezing effect of the conventional unfreezing liquid is slow. Therefore, it is necessary to develop a stuck freeing agent with the characteristics of strong rock corrosion capability and good environmental protection performance.

Disclosure of Invention

The invention aims to provide a drilling fluid stuck freeing agent based on vermicular micelle acid, a preparation method and a use method thereof, aiming at the defects in the prior art.

The technical scheme is as follows:

a lubricating and stuck releasing agent based on micro-emulsion organic slow-release acid comprises the following components in percentage by mass: 75.96-75.63% of vermicular micelle acid, 6.33-6.72% of penetrating agent, 5.06-5.04% of chelating agent and 12.66-12.61% of deionized water.

The penetrating agent in the technical scheme of the invention is polyethylene glycol (PEG), and further preferably one or any combination of two of PEG200, PEG400 and PEG 600.

The chelating agent in the technical scheme of the invention is one or any two of iminodisuccinic acid sodium, ethylene diamine tetra methylene phosphonic acid sodium, amino trimethylene phosphoric acid, diethylene triamine penta methylene phosphonic acid and ethylenediamine diphosphine hydroxyphenyl sodium acetate.

The preparation method comprises the following steps:

1. preparation of wormlike micellar acids

1) Adding 1000 to 1200g of alkyl trimethyl ammonium bromide, 50 to 80g of sodium oleate and 500 to 900900g of deionized water into a high-pressure reaction kettle in sequence, raising the temperature of the system to 60 to 80 ℃, stirring at the speed of 300 to 500rpm, and dissolving for 10 to 30min;

2) Sequentially adding 100 to 300g of sodium salicylate, 30 to 60g of sodium carbonate and 600 to 1000g of composite invisible acid into the reactor, and forming a micelle for reaction for 30 to 50min;

3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

Wherein, the alkyl trimethyl ammonium bromide is one or the combination of any two of tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide; the compound invisible acid is formed by combining any two of borofluoric acid, methyl formate, methyl acetate and ethyl acetate according to a molar ratio of 1.

2. Preparation of drilling fluid stuck freeing agent based on wormlike micelle acid

1) Sequentially adding 600 to 900g of vermicular micelle acid and 100 to 150g of deionized water into a high-pressure reaction kettle, increasing the temperature of the system to 30 to 50 ℃, and reacting for 20 to 50min at a stirring speed of 300 to 500rpm;

2) And adding 50 to 80g of penetrant and 40 to 60g of chelating agent into the reaction kettle, and continuing to react for 20 to 40min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the stuck freeing agent for the drilling fluid based on the wormlike micelle acid.

The use method of the lubricating stuck freeing agent based on the micro-emulsion organic slow-release acid comprises the following steps:

1) Combining 30m ethanol for drilling fluid based on worm-like micellar acid and combining 10m ethanol for cacl2 as a prefraction solution, on site, for later use;

2) When the drilling tool is stuck on site and the drilling tool is difficult to move, firstly driving in a 10m heading liquid, and then following in a 30m stuck freeing agent for drilling fluid based on worm micellar acid;

3) Circulating, namely putting the wormlike micelle into a drilling section while drilling, and standing, wherein the wormlike micelle has high viscosity, so that the system can quickly hover in the drilling section;

4) After the action is carried out for 6 to 12h, the drilling tool is moved back and forth, and the jam releasing is successful.

Wherein, the pad fluid is inorganic salt solution, and the preparation method comprises the following steps: and (2) performing on-site ethanol harvesting at 30m, adding tap water at 10m, slowly adding inorganic salt crystals while stirring until all 1 ton is added, and continuing to stir until the mixture is completely clarified. The inorganic salt is one or the combination of any two of NaCl, KCl, znCl2, caCl2 and MgCl 2.

The beneficial effects of the invention are:

according to the invention, firstly, the vermicular micelle is synthesized by alkyl trimethyl ammonium bromide and salicylic acid, and the composite invisible acid is embedded in the vermicular micelle, so that the micellic acid does not have any adverse effect on a drilling tool during the process of going into a well; the vermicular viscosity is extremely high, so that micellar acid can be stabilized at a drilling clamping layer, and the action efficiency is increased. After entering a drilling sticking layer, in the standing period, due to the action of a penetrant, the composite invisible acid in the worm micelle rapidly enters a stuck point, the composite invisible acid reacts to generate hydrogen radical ions at a stable rate, and rocks are effectively corroded; meanwhile, the formula also contains a chelating agent, and the chelating agent can assist in chelating and corroding the rock under the action of the chelating agent.

Drawings

None.

Detailed Description

Example 1:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1000g of tetradecyl trimethyl ammonium bromide, 50g of sodium oleate and 500g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 60 ℃, stirring at the speed of 300rpm, and dissolving for 10min; (2) Sequentially adding 100g of sodium salicylate, 30g of sodium carbonate and 600g of composite invisible acid (boric acid and methyl formate) into the reactor, and carrying out micelle reaction for 30min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 600g of wormlike micelle acid and 100g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 30 ℃, and reacting for 20min at the stirring speed of 300 rpm; (2) 50g of PEG200 and 40g of iminodisuccinic acid sodium are added into the reaction kettle, and the reaction is continued for 20min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 2:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1000g of hexadecyl trimethyl bromide, 50g of sodium oleate and 500g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 60 ℃, stirring at the speed of 300rpm, and dissolving for 10min; (2) Sequentially adding 100g of sodium salicylate, 30g of sodium carbonate and 600g of composite invisible acid (boric acid and methyl acetate) into the reactor, and performing micelle reaction for 30min; (3) Stopping the reaction to obtain the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 600g of wormlike micelle acid and 100g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 30 ℃, and reacting for 20min at the stirring speed of 300 rpm; (2) 50g of PEG400 and 40g of sodium ethylene diamine tetra methylene phosphonate are added into the reaction kettle, and the reaction is continued for 20min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 3:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1000g of octadecyl trimethyl ammonium bromide, 50g of sodium oleate and 500g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 60 ℃, stirring at the speed of 300rpm, and dissolving for 10min; (2) Sequentially adding 100g of sodium salicylate, 30g of sodium carbonate and 600g of composite invisible acid (boric acid and ethyl acetate) into the reactor, and performing micelle reaction for 30min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 600g of wormlike micelle acid and 100g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 30 ℃, and reacting for 20min at the stirring speed of 300 rpm; (2) 50g PEG600 and 40g aminomethyltrimethylene phosphate were added to the above reaction vessel and the reaction was continued for 20min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 4:

1) Preparation of vermicular micellar acid: (1) 1050g of tetradecyl trimethyl ammonium bromide, 60g of sodium oleate and 600g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 350rpm, and the dissolution is carried out for 15min; (2) Sequentially adding 110g of sodium salicylate, 40g of sodium carbonate and 700g of composite invisible acid (methyl formate and methyl acetate) into the reactor, and carrying out micelle forming reaction for 35min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 700g of wormlike micellar acid and 110g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 30min at the stirring speed of 400 rpm; (2) 60g of PEG200 and 50g of diethylenetriamine pentamethylene phosphonic acid are added into the reaction kettle, and the reaction is continued for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the stuck freeing agent for the drilling fluid based on the wormlike micelle acid.

Example 5:

1) Preparation of vermicular micellar acid: (1) 1050g of hexadecyl trimethyl ammonium bromide, 60g of sodium oleate and 600g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 350rpm, and the system is dissolved for 15min; (2) Sequentially adding 110g of sodium salicylate, 40g of sodium carbonate and 700g of composite invisible acid (methyl formate and ethyl acetate) into the reactor, and carrying out micelle reaction for 35min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a stuck freeing agent for drilling fluid based on the wormlike micellar acid: (1) Sequentially adding 700g of wormlike micellar acid and 110g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 30min at the stirring speed of 400 rpm; (2) 60g of PEG400 and 50g of sodium ethylenediamine diphosphinophenylglycolate are added into the reaction kettle, and the reaction is continued for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 6:

1) Preparation of vermicular micellar acid: (1) 1050g of octadecyl trimethyl ammonium bromide, 60g of sodium oleate and 600g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 350rpm, and the dissolution is carried out for 15min; (2) Sequentially adding 110g of sodium salicylate, 40g of sodium carbonate and 700g of composite invisible acid (methyl acetate and ethyl acetate) into the reactor, and carrying out micelle reaction for 35min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 700g of wormlike micellar acid and 110g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 30min at the stirring speed of 400 rpm; (2) 60g of PEG600 and 50g of iminodisuccinic acid sodium salt are added into the reaction kettle, and the reaction is continued for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 7:

1) Preparation of wormlike micellar acid: (1) 1100g of tetradecyl trimethyl ammonium bromide, 70g of sodium oleate and 800g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 400rpm, and the dissolution is carried out for 20min; (2) Sequentially adding 200g of sodium salicylate, 45g of sodium carbonate and 800g of composite invisible acid (boric acid and methyl formate) into the reactor, and carrying out micelle forming reaction for 40min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 750g of wormlike micellar acid and 125g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 35min at the stirring speed of 400 rpm; (2) 70g of PEG200 and 50g of ethylenediamine tetramethylene phosphonic acid sodium are added into the reaction kettle, and the reaction is continued for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the stuck freeing agent for the drilling fluid based on the wormlike micelle acid.

Example 8:

1) Preparation of vermicular micellar acid: (1) 1100g of hexadecyl trimethyl ammonium bromide, 70g of sodium oleate and 800g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 400rpm, and the dissolution is carried out for 20min; (2) Sequentially adding 200g of sodium salicylate, 45g of sodium carbonate and 800g of composite invisible acid (boric acid and methyl acetate) into the reactor, and performing micelle reaction for 40min; (3) Stopping the reaction to obtain the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 750g of wormlike micelle acid and 125g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 35min at the stirring speed of 400 rpm; (2) 70g of PEG400 and 50g of aminotrimethylene phosphate were added to the above reaction vessel, and the reaction was continued for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the stuck freeing agent for the drilling fluid based on the wormlike micelle acid.

Example 9:

1) Preparation of vermicular micellar acid: (1) 1100g of octadecyl trimethyl ammonium bromide, 70g of sodium oleate and 800g of deionized water are sequentially added into a high-pressure reaction kettle, the temperature of the system is raised to 70 ℃, the stirring speed is 400rpm, and the dissolution is carried out for 20min; (2) Sequentially adding 200g of sodium salicylate, 45g of sodium carbonate and 800g of composite invisible acid (boric acid and ethyl acetate) into the reactor, and carrying out micelle forming reaction for 40min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 750g of wormlike micelle acid and 125g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 40 ℃, and reacting for 35min at the stirring speed of 400 rpm; (2) 70g of PEG600 and 50g of diethylenetriamine pentamethylene phosphonic acid are added into the reaction kettle to continue the reaction for 30min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 10:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1200g of tetradecyl trimethyl ammonium bromide, 80g of sodium oleate and 900g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 80 ℃, stirring at the speed of 500rpm, and dissolving for 30min; (2) Sequentially adding 300g of sodium salicylate, 60g of sodium carbonate and 1000g of composite invisible acid (methyl formate + methyl acetate) into the reactor, and performing micelle reaction for 50min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a stuck freeing agent for drilling fluid based on the wormlike micellar acid: (1) Sequentially adding 900g of wormlike micelle acid and 150g of deionized water into a high-pressure reaction kettle, increasing the temperature of the system to 50 ℃, and reacting for 50min at a stirring speed of 500 rpm; (2) 80g of PEG200 and 60g of ethylenediamine diphosphine hydroxyphenyl sodium acetate are added into the reaction kettle, and the reaction is continued for 40min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 11:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1200g of hexadecyl trimethyl ammonium bromide, 80g of sodium oleate and 900g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 80 ℃, stirring at the speed of 500rpm, and dissolving for 30min; (2) Sequentially adding 300g of sodium salicylate, 60g of sodium carbonate and 1000g of composite invisible acid (methyl formate and ethyl acetate) into the reactor, and performing micelle reaction for 50min; (3) Stopping the reaction to obtain the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 900g of wormlike micelle acid and 150g of deionized water into a high-pressure reaction kettle, increasing the temperature of the system to 50 ℃, and reacting for 50min at a stirring speed of 500 rpm; (2) 80g of PEG400 and 60g of iminodisuccinic acid sodium are added into the reaction kettle, and the reaction is continued for 40min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Example 12:

1) Preparation of vermicular micellar acid: (1) Sequentially adding 1200g of octadecyl trimethyl ammonium bromide, 80g of sodium oleate and 900g of deionized water into a high-pressure reaction kettle, raising the temperature of the system to 80 ℃, stirring at the speed of 500rpm, and dissolving for 30min; (2) Sequentially adding 300g of sodium salicylate, 60g of sodium carbonate and 1000g of composite invisible acid (methyl acetate and ethyl acetate) into the reactor, and performing micelle reaction for 50min; (3) Stopping the reaction, and obtaining the viscous liquid which is the wormlike micellar acid.

2) Preparing a drilling fluid stuck freeing agent based on the vermicular micelle acid: (1) Sequentially adding 900g of wormlike micellar acid and 150g of deionized water into a high-pressure reaction kettle, increasing the temperature of the system to 50 ℃, and reacting for 50min at a stirring speed of 500 rpm; (2) 80g of PEG600 and 60g of ethylenediamine tetramethylene phosphonic acid sodium are added into the reaction kettle, and the reaction is continued for 40min. After the reaction is finished, the temperature is reduced to room temperature, and the obtained viscous liquid is the drilling fluid stuck freeing agent based on the wormlike micelle acid.

Performance testing

The stuck freeing performance of the drilling fluid is measured according to the powdery stuck freeing agent for SY/Z Q007-89 drilling, the mud cake soaking performance of the conventional diesel oil-based stuck freeing agent is firstly measured, then the stuck freeing performance of the stuck freeing agent for the drilling fluid based on the vermicular micelle acid is measured, and the stuck freeing performance after different time of action is measured, and the results are shown in Table 1.

TABLE 1 soaking of different stuck freeing agents in mud cake

Test formulations	30min	1h	2h	8h
					Conventional diesel-oil-based stuck freeing agent	A shallow crack appears	A shallow crack appears	A deep crack appears	A deep crack appears and no turbidity is generated
Example 1	Original state	Original state	The mud cake was broken into 8 pieces and turbidity appeared	Breaking the mud cake into 12 pieces, and peeling
					Example 2	Original state	Original state	The mud cake was broken into 4 pieces and turbidity appeared	Breaking the mud cake into 8 pieces, and peeling
Example 3	Original state	Original state	The mud cake broke into 5 pieces and appeared cloudy	Breaking the mud cake into 9 pieces, and peeling
					Example 4	Original state	Original state	The mud cake broke into 6 pieces and appeared cloudy	Breaking the mud cake into 10 pieces, and peeling
Example 5	Original state	Original state	The mud cake was broken into 8 pieces and turbidity appeared	Breaking the mud cake into 12 pieces, and stripping
					Example 6	Original state	Original state	The mud cake broke into 5 pieces and appeared cloudy	Breaking the mud cake into 8 pieces, and peeling
Example 7	Original state	Original state	The mud cake broke into 7 pieces and appeared cloudy	Breaking the mud cake into 11 pieces, and peeling
					Example 8	Original state	Original state	The mud cake was broken into 9 pieces and turbidity appeared	Breaking the mud cake into 13 pieces, and peeling
Example 9	Original state	Original state	The mud cake broke into 8 pieces and appeared cloudy	Breaking the mud cake into 12 pieces, and stripping
					Example 10	Original state	Original state	The mud cake broke into 7 pieces and appeared cloudy	Breaking the mud cake into 10 pieces, and peeling
Example 11	Original state	Original state	The mud cake broke into 10 pieces and appeared cloudy	Breaking the mud cake into 12 pieces, and peeling
					Example 12	Original state	Original state	The mud cake was broken into 12 pieces and turbidity appeared	Breaking the mud cake into 15 pieces, and peeling

From the above results, it can be seen that all the examples have no effect basically in the beginning, but the effect is obvious after reaching 2h, the effect is much better than that of the conventional oil-based stuck remover, and after reaching 8h, the corrosion effect is more obvious, the number of cracks is increased, and the stuck remover is stripped from the well wall, which fully proves the stuck remover.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (11)

1. A drilling fluid stuck freeing agent based on wormlike micellar acid is characterized by comprising the following components by mass percent:

75.96-75.63% of vermicular micelle acid, 6.33-6.72% of penetrating agent, 5.06-5.04% of chelating agent and 12.66-12.61% of deionized water.

2. The drilling fluid stuck releasing agent based on the vermicular micelle acid of claim 1, wherein the penetrating agent is one or the combination of any two of polyethylene glycol (PEG), PEG200, PEG400 or PEG 600.

3. The spotting agent for drilling fluid based on vermicular micelle acid of claim 1, wherein the chelating agent is one or any two of iminodisuccinic acid sodium salt, ethylene diamine tetra methylene phosphonic acid sodium salt, amino trimethylene phosphoric acid, diethylene triamine pentamethylene phosphonic acid, ethylene diamine diphosphine hydroxyphenyl sodium acetate.

4. The spotting agent for drilling fluid based on wormlike micellar acid of claim 1, wherein the wormlike micellar acid is prepared by the following steps:

(1) Adding 1000 to 1200g of alkyl trimethyl ammonium bromide, 50 to 80g of sodium oleate and 500 to 900900g of deionized water into a high-pressure reaction kettle in sequence, raising the temperature of the system to 60 to 80 ℃, stirring at the speed of 300 to 500rpm, and dissolving for 10 to 30min;

(2) Adding 100 to 300g of sodium salicylate, 30 to 60g of sodium carbonate and 600 to 1000g of compound invisible acid into the reactor in sequence, and carrying out micelle reaction for 30 to 50min;

(3) Stopping the reaction to obtain the viscous liquid which is the wormlike micellar acid.

5. The preparation method of the spotting agent for the drilling fluid based on the vermicular micelle acid as claimed in any one of claims 1 to 4, which comprises the following steps:

(1) Sequentially adding 600 to 900g of vermicular micelle acid and 100 to 150g of deionized water into a high-pressure reaction kettle, increasing the temperature of the system to 30 to 50 ℃, and reacting for 20 to 50min at a stirring speed of 300 to 500rpm;

(2) And adding 50 to 80g of penetrant and 40 to 60g of chelating agent into the reaction kettle, continuing to react for 20 to 40min, and after the reaction is finished, reducing the temperature to room temperature to obtain viscous liquid, namely the stuck releasing agent for the drilling fluid based on the wormlike micellar acid.

6. The preparation method of the drilling fluid stuck-releasing agent based on the wormlike micellar acid as in claim 5, wherein the alkyl trimethyl ammonium bromide is one or the combination of any two of tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide.

7. The preparation method of the spotting agent for the drilling fluid based on the vermicular micelle acid as claimed in claim 5, wherein the composite stealth acid is prepared by combining any two of borofluoric acid, methyl formate, methyl acetate and ethyl acetate in a molar ratio of 1.

8. The use method of the drilling fluid stuck freeing agent based on the wormlike micellar acid as in any one of claims 1 to 4, is characterized in that the field use method comprises the following steps:

1) Preparing 30m of a drilling fluid jam releasing agent based on worm micellar acid and 10m of a front rushing solution on site for standby application;

2) When the drilling tool is stuck on site and the drilling tool is difficult to move, firstly driving the pre-stressing fluid for 10m high-speed transportation, and then following 30m high-speed transportation with the stuck releasing agent for the drilling fluid based on the wormlike micellar acid;

3) Circulating, namely putting the wormlike micelle into a drilling section while drilling, and standing, wherein the wormlike micelle has high viscosity, so that the system can quickly hover in the drilling section;

4) After the action is carried out for 6 to 12h, the drilling tool is moved back and forth, and the jam releasing is successful.

9. The use method of the drilling fluid stuck-releasing agent based on the wormlike micellar acid as in claim 8, wherein the pad fluid is an inorganic salt solution.

10. The use method of the drilling fluid stuck freeing agent based on the vermicular micelle acid as claimed in claim 8, wherein the preparation method of the inorganic salt solution is as follows:

and (2) performing on-site ethanol harvesting at 30m, adding tap water at 10m, slowly adding inorganic salt crystals while stirring until all 1 ton is added, and continuing to stir until the mixture is completely clarified.

11. The use method of the drilling fluid stuck freeing agent based on vermicular micelle acid as claimed in claim 10, wherein the inorganic salt crystal is one or any two combination of NaCl, KCl, znCl2, caCl2 and MgCl 2.