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Sulfur removal coiled tubing drag reducer

A drag reducer, metal drag reducer technology, applied in the petroleum industry, lubricating composition, etc., can solve the problems of complex engineering, coiled tubing corrosion, expansion and migration, etc., and achieve simple preparation method, high sulfur removal capacity, The effect of high anti-expansion performance

Active Publication Date: 2021-11-23
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-concentration aqueous solution of this system can greatly reduce the friction coefficient between metal tubing strings, thereby reducing the self-locking degree of coiled tubing and increasing the extension length of coiled tubing in the horizontal section; There are certain deficiencies in the above, especially when the oil and gas layers have been opened and coiled tubing construction is required, such as when coiled tubing plugs are used after fracturing construction, in this case, the formation has been exposed, when the coiled tubing drag reducer and formation When clay is in contact, it is easy to make it expand and migrate, which will affect the permeability of the formation and cause pollution damage to the formation, further affecting oil and gas production; The generation of hydrogen gas or the generation of hydrogen sulfide gas during the acidizing operation will cause severe corrosion to the coiled tubing, resulting in a significant reduction in the strength of the coiled tubing, and in serious cases, it may break during construction, causing engineering complexity or engineering accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A sulfur removal type coiled tubing drag reducer, the specific preparation method is as follows:

[0023] S1. Measure 70mL of clear water, stir at a high speed of 10000r / min, add 15g of Tween-80, stir for 5min, add 5g of Swire oil, continue stirring for 15min, then add 10g of ethylene glycol, and stir for another 5min to get metal drag reducer;

[0024] S2. Dissolve 330g of triethanolamine in 60mL of water, raise the temperature to 50°C, and add 270g of benzyl chloride dropwise for 1 hour. After the addition, the temperature is raised to 75°C, and the reaction is continued for 4 hours to obtain a clay stabilizer;

[0025] S3. Measure 97.9 mL of clear water, add 0.1 g of the metal drag reducer prepared in the above step S1, 1 g of the clay stabilizer prepared in the above step S2, and 0.5 g of hydroxyethyl hexachloro-s-triazine and 0.5 g of Pyridinium quaternary ammonium salt corrosion inhibitor, stirred evenly at room temperature, can obtain desulfurization type coiled...

Embodiment 2

[0027] A sulfur removal type coiled tubing drag reducer, the specific preparation method is as follows:

[0028] S1. Measure 45mL of clear water, stir at a high speed of 10000r / min, add 20g of isomeric tridecyl alcohol polyoxyethylene ether, stir for 5min, add 15g of Swire oil, continue stirring for 15min, add 20g of propylene glycol, and stir for another 5min , that is, the metal drag reducer is obtained;

[0029] S2. Dissolve 330g of triethanolamine in 100mL of water, raise the temperature to 70°C, add 300g of benzyl chloride dropwise for 2 hours, after the dropwise addition, raise the temperature to 110°C, and continue the reaction for 8 hours to obtain a clay stabilizer;

[0030] S3. Measure 82mL, 20wt.% hydrochloric acid aqueous solution, add 2g of the metal drag reducer prepared in the above step S1, 2g of the clay stabilizer prepared in the above step S2, 10g of tert-butylaminoethoxyethanol and 4g of pyridinium quaternary ammonium The salt corrosion inhibitor is stirre...

Embodiment 3

[0032] A sulfur removal type coiled tubing drag reducer, the specific preparation method is as follows:

[0033] S1. Measure 40mL of clear water, stir at a high speed of 10000r / min, add 40g of isomeric tridecyl alcohol polyoxyethylene ether, stir for 5min, add 10g of Swire oil, continue stirring for 15min, add 10g of ethylene glycol, and then Stir for 5 minutes to obtain the metal drag reducer;

[0034] S2. Dissolve 360g of triethanolamine in 60mL of water, raise the temperature to 60°C, add 270g of benzyl chloride dropwise for 2h, after the dropwise addition, raise the temperature to 100°C, and continue the reaction for 6h to obtain the clay stabilizer;

[0035] S3, measure 91mL, 15wt% hydrochloric acid aqueous solution, add 0.5g metal drag reducing agent that above-mentioned step S1 makes, 1.5g clay stabilizer that above-mentioned step S2 makes, 5g, 37wt.% formaldehyde aqueous solution and 2g pyridine quaternary The ammonium salt corrosion inhibitor is stirred evenly at roo...

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Abstract

The invention discloses a drag reducing agent for sulfur-removing coiled tubing, which comprises 0.5-10% of organic sulfur-removing agent, 0.1-2% of metal drag-reducing agent, 1-2% of clay stabilizer, 0.5% ~4% of corrosion inhibitor, and the balance of water or hydrochloric acid solution; wherein, the metal drag reducer includes 5~15% of swire oil by mass fraction, 15~40% of nonionic surfactant, 10~ 20% small molecule glycol and the balance are water; the clay stabilizer is the benzyl quaternary ammonium salt obtained by the reaction of triethanolamine and benzyl chloride; the corrosion inhibitor is a commercially available pyridine quaternary ammonium salt corrosion inhibitor; the Sulfur-removing coiled tubing drag reducer is suitable for various downhole working fluids with a pH value between 1 and 12. The temperature resistance is as high as 120°C, the anti-swelling rate is >90%, the sulfur removal capacity is >150,000mg / L, and the salinity is high. The bearing capacity value can reach up to 30000mg / L. At the same time, the addition of the drag reducer can reduce the friction coefficient between metal materials from 0.74 to 0.12. It is suitable for preparing fracturing fluid, acid fluid, perforating fluid and workover Additives for various downhole working fluids.

Description

technical field [0001] The invention relates to the technical field of downhole operations in exploration and development of oil and gas fields, in particular to a sulfur-removing coiled tubing drag reducer. Background technique [0002] In the field of downhole operations, the construction tasks of coiled tubing mainly include: coiled tubing cutting, salvage, sand washing and plugging removal during workover; , and drilling plug operations. Among them, for highly deviated wells or horizontal wells with long horizontal sections, the construction of coiled tubing is affected by the length of the horizontal section, the wellbore trajectory, the inclination angle of the horizontal section, etc., and the "locking" phenomenon of coiled tubing running often occurs. That is: during the process of coiled tubing entering the well, due to the buckling of the coiled tubing itself, it will rub against the inner wall of the steel casing during the horizontal section to generate resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M173/02C10N30/06C10N30/08
CPCC10M173/02C10M2207/022C10M2209/103C10M2209/108C10M2209/109C10M2211/024C10M2215/042C10M2215/221C10M2215/222C10M2219/042C10N2030/06C10N2030/08C10N2010/02
Inventor 邹鹏刘林刘春龙杨艳昌杨津李博呼桂艳刘泽宇曹宁曹雅坤
Owner CNPC BOHAI DRILLING ENG
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