Environment-friendly coiled tubing drag reducing agent

An environment-friendly, drag-reducing agent technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of swelling and migration, formation pollution damage, reduce the self-locking degree of coiled tubing, etc., and achieve high anti-swelling Performance, effect of high temperature resistance

Inactive Publication Date: 2019-03-12
CNPC BOHAI DRILLING ENG
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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 cause swelling and migration, which affects the permeability of the formation and causes pollution damage to the formation, further affecting oil and gas production

Method used

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  • Environment-friendly coiled tubing drag reducing agent
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Examples

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Effect test

Embodiment 1

[0018] An environment-friendly coiled tubing drag reducer, the specific preparation method is as follows:

[0019] S1. Mix 330g of triethanolamine and 60mL of water evenly, raise the temperature to 50°C, add 270g of benzyl chloride dropwise within 1 hour, raise the temperature to 75°C, and continue the reaction for 4 hours to obtain a clay stabilizer;

[0020] S2, measure 60mL of clear water, under the condition of high-speed stirring (stirring speed 10000r / min), add 15g Tween-80, stirring time is 5min, add 5g Swire oil, stir for 15min, add 10g ethylene glycol and 10g prepared in step S1 Clay stabilizer, stirred for 5 minutes to obtain an environment-friendly coiled tubing drag reducer.

Embodiment 2

[0022] An environment-friendly coiled tubing drag reducer, the specific preparation method is as follows:

[0023] S1. Mix 330g of triethanolamine and 100mL of water evenly, raise the temperature to 70°C, add 300g of benzyl chloride dropwise within 2 hours, raise the temperature to 110°C, and continue the reaction for 8h to obtain a clay stabilizer;

[0024] S2. Measure 25mL of clear water, under high-speed stirring, add 20g of isomeric tridecyl alcohol polyoxyethylene ether, stirring time is 5min, add 15g of Swire oil, stir for 15min, add 20g of ethylene glycol and 20g of the clay stabilizer prepared in step S1 , and stirred for 5 minutes to obtain an environment-friendly coiled tubing drag reducer.

Embodiment 3

[0026] An environment-friendly coiled tubing drag reducer, the specific preparation method is as follows:

[0027] S1. Mix 360g of triethanolamine and 60mL of water evenly, raise the temperature to 60°C, add 270g of benzyl chloride dropwise within 2 hours, raise the temperature to 100°C, and continue the reaction for 6h to obtain a clay stabilizer;

[0028] S2. Measure 25mL of clear water, stir at high speed (stirring speed 10000r / min), add 40g of isomeric tridecyl alcohol polyoxyethylene ether, stir for 5min, add 10g of swire oil, stir for 15min, add 10g of ethylene glycol and 15g of The clay stabilizer prepared in step S1 was stirred for 5 minutes to obtain an environment-friendly coiled tubing drag reducer.

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Abstract

The invention discloses an environment-friendly coiled tubing drag reducing agent. The environment-friendly coiled tubing drag reducing agent is prepared from the following materials by mass percent:5-15% of Turkey red oil, 15-40% of nonionic surfactant, 10-20% of small molecular dihydric alcohol, 10-20% of clay stabilizer and the balance of water; the nonionic surfactant is a Tween surfactant orisomeric alcohol ethoxylates; the small molecule dihydric alcohol is ethylene glycol, propylene glycol or butanediol; the clay stabilizer is benzyl quaternary ammonium salt obtained by reacting triethanolamine and benzyl chloride. The environment-friendly coiled tubing drag reducing agent is suitable for various downhole working fluids with the pH value between 1 and 14 and the mineralization degree not exceeding 30,000 mg / L, temperature resistance is up to 150 DEG C, an anti-expansion rate is greater than 83%, anti-expansion performance duration is greater than 1 month, and the addition of the drag reducing agent can make a friction coefficient between metal materials reduced from 0.74 to 0.12, and is suitable for serving as an additive for preparing the various downhole working fluids such as fracturing fluid, acid solution, perforating fluid, workover fluid and the like.

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 an environment-friendly 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 re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/74C09K8/035C09K8/72
CPCC09K8/035C09K8/68C09K8/725C09K8/74C09K2208/12
Inventor 邹鹏张世林刘林王志明刘春龙杨艳昌张龙杨津李博曹宁
Owner CNPC BOHAI DRILLING ENG
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