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Preparation method and application of polyoxyethylene-based polymer filtrate reducer

A fluid loss control agent, allyl polyoxyethylene ether technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of poor drilling fluid rheological properties, high temperature resistance, high salinity resistance problems such as poor ability, to achieve the effect of good water loss reduction ability, mild synthesis conditions and easy polymerization

Active Publication Date: 2013-08-21
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problems of current fluid loss reducers used in drilling fluids, such as poor high temperature resistance and high salinity resistance, and poor rheological properties of drilling fluids at high temperatures, a polyoxyethylene Preparation method and application of base polymer fluid loss reducer

Method used

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  • Preparation method and application of polyoxyethylene-based polymer filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Preparation method of polyoxyethylene-based polymer fluid loss reducer

[0009] First put 0.006mol of allyl polyoxyethylene ether into a three-neck bottle, add 20.0mL of deionized water, put it in a water bath and heat it to dissolve; add 0.029mol of 2 -Acrylamide-2-methylpropanesulfonic acid and 0.084mol of acrylamide, then add 82mL of deionized water to make a solution with a total monomer mass concentration of 15%, and use potassium persulfate and sodium bisulfite in a mass ratio of The 1:1 mixing system is the initiator, the addition amount is 0.2% of the total mass of the monomer, and the NaOH solution with a mass percent concentration of 50% is used to adjust its pH value to 9. After stirring and mixing evenly, the above mixed solution is mixed in The reaction was carried out at 60° C. for 3 hours. A gel-like product is obtained through the copolymerization reaction, which is purified and extracted with absolute ethanol, sheared and granulated, vacuum-...

Embodiment 2

[0010] Embodiment 2: the preparation of drilling fluid base slurry

[0011] According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China SY / T5241-91 "Evaluation Procedures for Fluid Loss Control Agents for Water-based Drilling Fluids", prepare freshwater-based slurry, salt-water-based slurry and polymer-based slurry.

[0012] (1) Preparation of fresh water base slurry: add 40g calcium bentonite and 2g anhydrous NaCO to 1000mL water 3 , stirred at a high speed for 20 minutes, and sealed at room temperature for 24 hours to obtain a freshwater base slurry.

[0013] (2) Preparation of brine-based slurry: add 40g of calcium bentonite and 2g of anhydrous Na to 1000mL of distilled water 2 CO 3 , and then add a certain amount of NaCl, stir at high speed for 20 minutes, and keep in airtight storage at room temperature for 24 hours to obtain the brine-based slurry.

[0014] (3) Preparation of polymer slurry: put the prepared base slurry into a high s...

Embodiment 3

[0015] Example 3: Salt Resistance Performance of Polymer Fluid Loss Control Agent

[0016] Add polymer fluid loss reducer with a mass percentage concentration of 1.2% to the fresh water slurry, stir evenly, then add different amounts of NaCl, stir at high speed for 5-10 minutes, test the API fluid loss and rheological properties of the drilling fluid, Evaluation of its salt resistance performance, the results are shown in Table 1.

[0017] Table 1 Salt resistance of polymer-based pulp

[0018]

[0019] It can be seen from Table 1 that with the increase of NaCl content in the mud system, the water loss of the drilling fluid gradually decreases. When the salt content is 30%, the fluid loss is the lowest, reaching 5.5mL, indicating that the polymer fluid loss additive is salt-resistant Ability is better.

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Abstract

The invention relates to a preparation method and application of a polyoxyethylene-based polymer filtrate reducer for oil and gas field drilling fluid, aiming at solving the problems that an existing filtrate reducer for the drilling fluid has poor high temperature resistance and hypersalinity resistance and poor rheological property at high temperature. According to the technical scheme, the preparation method comprises the following steps of adding allyl polyoxyethylene ether into water and heating for dissolving; then adding 2-acrylamide-2-methyl propanesulfonic acid and acrylamide, adding an initiator and stirring uniformly, and regulating the pH of a system to be 8-10 by using an NaOH solution; and finally reacting for 2-5 hours at 50-80 DEG C to obtain a gel product through a copolymerization reaction, purifying and extracting by using absolute ethyl alcohol, cutting and pelleting, drying in vacuum, and smashing so as to prepare the polymer filtrate reducer. According to the evaluation of the temperature resistance, the salt resistance and rheological property of the polymer basic mud by adding the filtrate reducer into fresh water basic mud and salt water base, the filtrate reducer has strong salt resistance, good high temperature resistance and stable rheological property. The preparation method is simple and mild in synthesis conditions.

Description

technical field [0001] The invention relates to a preparation method and application of a polyoxyethylene-based polymer fluid loss control agent used in drilling fluids in oil and gas field drilling. The prepared polymer fluid loss control agent is suitable for fresh water and salt water drilling fluid systems. The high temperature resistance of the fluid loss control agent is better. Background technique [0002] Among the numerous additives in drilling fluid, fluid loss control agent for drilling fluid is one of the most important additives. Fluid loss reducer is an important mud treatment agent used to keep the performance of drilling fluid stable, reduce the loss of harmful liquid to the formation, stabilize the well wall and ensure regular well diameter. Traditional fluid loss control agents can no longer meet the needs of increasingly complex formations. With the continuous exploitation of deep wells and high-salt gypsum formations, fluid loss control agents for drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/58C08F220/56C08F4/40C09K8/035
Inventor 全红平明显森黄志宇张太亮鲁红升戴珊珊段文猛
Owner SOUTHWEST PETROLEUM UNIV
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