Temperature resistant and salt resistant oil well cement fluid loss agent with double-sided plexiform structure and preparation method thereof

A fluid loss reducing agent and oil well cement technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of cementing operation failure, poor cementing quality, cement slurry dehydration, etc., and achieve good compatibility , reduce water loss, increase the effect of heat and salt resistance

Active Publication Date: 2019-12-10
四川弘晟石油工程技术服务有限公司
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AI Technical Summary

Problems solved by technology

Due to the non-renewable nature of petroleum resources and the increasing demand for them, on the one hand, with the reduction of shallow oil and gas resources, oil and gas exploration and development are developing towards deep high-temperature formations; on the other hand, the development of clean energy such as geothermal energy is a national key development field; in the drilling process of oil and gas field development and geothermal resource development, the temperature of the formation encountered is getting higher and higher, and more and more cases of drilling into salt gypsum layer and saline layer; high temperature and high salt cause cement slurry to lose water It is more serious, not only causing different degrees of damage to the formation, poor cementing quality, and even failure of cementing operation

Method used

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  • Temperature resistant and salt resistant oil well cement fluid loss agent with double-sided plexiform structure and preparation method thereof
  • Temperature resistant and salt resistant oil well cement fluid loss agent with double-sided plexiform structure and preparation method thereof
  • Temperature resistant and salt resistant oil well cement fluid loss agent with double-sided plexiform structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] A method for preparing a double-sided plexus structure anti-temperature and anti-salt oil well cement fluid loss reducing agent, comprising the following steps:

[0040] (1) Weigh 41.44g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 7.11g of acrylamide (AM), 7.21g of acrylic acid (AA), 0.0558g of graphene, and 258g of water;

[0041] (2) Water is added to the reaction kettle, then graphene is added, and stirred at a high speed for 30min, so that the graphene is uniformly dispersed in water to obtain a graphene dispersion;

[0042] (3) Add all AMPS, AA, and AM to the reaction kettle, and stir at high speed for 30 minutes; slowly add 11.0g-12.0g NaOH to the uniformly mixed reaction solution, and adjust the pH of the solution to 7.0-8.0;

[0043] (4) Raise the temperature of the reaction solution to 80°C, pass nitrogen gas into the reaction kettle for 15 minutes to remove oxygen at a ventilation rate of 3L / min~5L / min, then add 0.2230g of ammonium persulfate, react a...

experiment approach 1

[0054] Experimental scheme 1: Experimental temperature, 90°C; experimental cement slurry formula: 600g Jiahua G grade oil well cement + 0.3% oil well cement drag reducer SXY + 3%-4% fluid loss reducer solution + 0.3% ~ 1.0% oil well Cement retarder BS200R (medium temperature) + water (W / C=0.44).

experiment approach 2

[0055] Experimental scheme 2: Experimental temperature, 150°C and 200°C; the experimental cement slurry formula is: 600g Jiahua G grade oil well cement + 240g quartz sand + 0.3% oil well cement drag reducer SXY + 4%-6% fluid loss reducer solution + 3% ~ 8% oil well cement retarder BS200G (high temperature) + water (W / S=0.42).

[0056] The traditional similar linear fluid loss reducer BS100L (produced by Sichuan Hongsheng Petroleum Engineering Technology Service Co., Ltd.) was selected as a comparison sample, and the experimental test was carried out under the same conditions. The experimental results are shown in Table 1.

[0057] Table 1. Temperature resistance test results of fluid loss reducer of the present invention and traditional fluid loss reducer

[0058]

[0059] The experimental results in Table 1 show that the fluid loss reducer prepared by the present invention can be used at a temperature ranging from 90°C to 200°C (circulation temperature); the API loss of c...

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Abstract

The invention discloses a temperature resistant and salt resistant oil well cement fluid loss agent with a double-sided plexiform structure. The fluid loss agent is prepared by in-situ grafting of a raw material monomer 2-acrylamide-2-methylpropane sulfonic acid, acrylamide, acrylic acid and graphene. A preparation method comprises the specific steps that S1, the graphene is dispersed in water ina reaction kettle to obtain graphene dispersion liquid; S2, the 2-acrylamide-2-methylpropane sulfonic acid, the acrylamide and the acrylic acid are added into the graphene dispersion liquid, and are stirred and mixed uniformly, and the pH of reaction liquid is adjusted to 7.0-8.0; and S3, the reaction liquid is heated up to 80 DEG C+/-2 DEG C, nitrogen is introduced for removing oxygen, then ammonium persulfate is added, and reaction is conducted at constant temperature for 8 h to obtain the product fluid loss agent. According to the fluid loss agent, the water loss of oil well cement slurry can be effectively reduced, the temperature and salt resistant performance of the fluid loss agent is improved at the same time, the fluid loss agent can be applied to high-temperature and high saliferous stratum well cementation of deep wells and ultra-deep wells, and also can be used for common condition well cementation.

Description

technical field [0001] The invention relates to the field of cementing technology in the development of oil and gas fields and geothermal resources, in particular to a graphene in-situ grafted double-sided plexus structure anti-temperature and anti-salt oil well cement fluid loss reducer and a preparation method thereof. Background technique [0002] Cementing is a key link in the construction process of oil and gas wells. Its main purpose is to isolate formation fluid, support the well wall and casing, prevent casing corrosion, and build a controllable oil and gas production channel, so as to increase the production of subsequent oil and gas wells. Provide basic conditions for production layer stimulation, workover and other projects. [0003] In the cementing process of oil field well cementing, when the cement slurry flows through the permeable formation, the liquid phase in the cement slurry will seep into the formation under the action of pressure difference, this pheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/58C08F220/56C08F220/06C09K8/467
CPCC08F292/00C09K8/467C08F220/56C08F220/06
Inventor 王太聪王艾王建张燕刘华强蒋开海刘凯张含费
Owner 四川弘晟石油工程技术服务有限公司
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