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Preparation method for filtrate reducer

A technology of fluid loss control agent and initiator, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fluid loss control agent instability, fluid loss control agent performance reduction, incomplete interface contact, etc.

Inactive Publication Date: 2012-07-18
河南金马石油科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the widely used fluid loss control agents all use aqueous solution polymerization method or inverse emulsion polymerization method. Taking the aqueous solution polymerization method as an example, the water-soluble raw materials are dissolved in water to form an aqueous solution, which is directly polymerized with the oil-soluble monomer. complete, the reaction efficiency is low, and the reaction heat of aqueous solution polymerization is unevenly distributed, resulting in local overheating in the aqueous solution. Local overheating will cause cross-linking of the polymer and increase the viscosity, which cannot be used as a fluid loss control agent; while the inverse emulsion polymerization method It is to dissolve the water-soluble raw material in the aqueous solution and then disperse it in the non-polar liquid through the emulsifier to form a water-in-oil type emulsion, which avoids local overheating during the polymerization process, but the filter-reduced filter prepared by the reverberation emulsion polymerization method Fluid loss additive is unstable, long-term placement or drastic external condition changes will cause fluid loss additive to delaminate and reduce performance

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  • Preparation method for filtrate reducer
  • Preparation method for filtrate reducer
  • Preparation method for filtrate reducer

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preparation example Construction

[0033] The present invention provides a kind of preparation method of fluid loss reducer, comprising:

[0034] mixing sodium styrene sulfonate, acrylic acid, and acrylamide in water to obtain a first solution;

[0035] mixing the surfactant in an oil-soluble solvent to obtain a second solution;

[0036] The first solution is added to the second solution, and an aqueous solution of an initiator is added to the second solution to undergo a copolymerization reaction to obtain a fluid loss control agent.

[0037] According to the present invention, the raw materials for preparing the fluid loss reducer are 1 to 5 parts of sodium styrene sulfonate by weight fraction; 1 to 5 parts of acrylic acid; 1 to 5 parts of acrylamide; 2 to 20 parts of water; 5 to 10 parts of surface Active agent; 0.5-1.5 parts of initiator; 80-90 parts of oil-soluble solvent. The sodium styrene sulfonate, acrylic acid, acrylamide and water are mixed in parts by weight to obtain a transparent solution with a...

Embodiment 1

[0044] 200ml of cyclohexane and 15.6g of surfactant were respectively added to a three-necked beaker equipped with a condenser tube, a stirring bar and a constant pressure dropping funnel, and stirred evenly. The surfactant is prepared from Span80 and Tween80 at a mass ratio of 7:3, and its HLB=7.5.

[0045] Mix 3 g of sodium styrene sulfonate, 6 g of acrylic acid and 14 g of acrylamide evenly and place them in a beaker, then add 8.2 g of distilled water into the beaker to prepare a transparent solution with a total concentration of 20%.

[0046] The transparent solution is added into a three-necked flask to form a reverse microemulsion with cyclohexane and a surfactant, the reverse microemulsion is put into a constant temperature water bath magnetic stirring pot and the temperature is raised to 50 ° C, and then the mass concentration is A 1% aqueous solution of the initiator is added dropwise into the microemulsion, reacted for 3 hours, and the reaction temperature is 50° C., a...

Embodiment 2

[0049] Add 60g calcium bentonite and 5g Na in 1000ml water 2 CO 3 , stirred at a high speed for 20 minutes, and placed at room temperature for 24 hours to obtain a freshwater base slurry.

[0050] The fluid loss control agent prepared in Example 1 was mixed with the fresh water base slurry at a weight ratio of 0.1:100 to obtain a mixed base slurry. image 3 The SEM figure of the mixed base slurry prepared for this embodiment, and figure 2 In comparison, the mixed base slurry added with the fluid loss control agent has a denser structure and smaller pores, indicating that the fluid loss control agent prepared in this example can effectively improve the water loss resistance of the base slurry.

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Abstract

The invention provides a preparation method for a filtrate reducer. The method comprises the following steps of: mixing sodium styrene sulfonate, acrylic acid and acrylamide in water to obtain a first solution; mixing a surfactant into an oil-soluble solvent to obtain a second solution; and adding the first solution into the second solution, and adding an aqueous solution of an initiator into the second solution for undergoing a copolymerization reaction to obtain the filtrate reducer. A process is easy to control; and a reverse micro-emulsion polymerizing method is adopted, so that the polymerizing speed is high, and the obtained filtrate reducer is stable, consists of uniformly-distributed fine particles, and is not delaminated after being stored for a long time; and the product has high temperature resistance and high salt resistance.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a preparation method of a fluid loss control agent. Background technique [0002] In oil exploration or drilling operations, the drill bit is easily damaged under the action of huge pressure and friction, so drilling fluid is used to protect the drill bit during drilling operations, but the drilling fluid will seep into the formation soil under pressure and cause loss , this process is commonly referred to as "dehydration". A large amount of water loss entering the soil will not only induce wellbore instability, but also cause damage to oil and gas layers. The current solution to this problem is to add fluid loss control agents to the drilling fluid, which can block all directions The capillary channels in the mud cake formed by the drilling fluid and the soil make it smooth and dense; increase the negative charge density of the mud cake to form a strong polarized water layer; t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F212/14C08F220/06C08F2/32C09K8/035
Inventor 马礼俊姚杰王忠交关红伟赵善波
Owner 河南金马石油科技有限责任公司