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A kind of composite fluid loss reducer for drilling fluid based on modified prolifera and preparation method thereof

A technology of fluid loss reducer and drilling fluid, applied in drilling compositions, chemical instruments and methods, reagents, etc., can solve the problems of high temperature resistance to fluid loss, difficult biodegradation, and potential environmental protection problems, and achieve increased filtration reduction. Loss and plugging effect, improve the effect of temperature resistance and filtration reduction effect

Active Publication Date: 2022-07-12
中石化石油工程技术服务有限公司 +2
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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 to solve the problem that the commonly used anti-high temperature fluid loss reducer in the current drilling fluid is difficult to biodegrade and has a relatively large environmental protection hazard, and proposes a composite fluid loss reducer for drilling fluid based on modified enteromorpha and its preparation method

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  • A kind of composite fluid loss reducer for drilling fluid based on modified prolifera and preparation method thereof
  • A kind of composite fluid loss reducer for drilling fluid based on modified prolifera and preparation method thereof

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preparation example Construction

[0033] The concrete preparation method of the present invention comprises the following steps:

[0034] 1. Pretreatment of prolifera

[0035] (1) Use deionized water to clean prolifera, remove impurities such as sand, mud and shells, and clean 5 to 10 times until there are no impurities, no color in the drained water, and the concentration of drained salt is less than 10ppm;

[0036] (2) Vacuum dry for 20 hours at 60°C. After drying, use a pulverizer to pulverize, inspect with a standard inspection sieve, pulverize to 800~1000 mesh, and set aside.

[0037] Among them, the prolifera used is the green algae Ulvaaceae plant, the algae is bright green, composed of a single layer of cells, with an adhesive band-like structure, rich in carbohydrates, proteins, crude fibers, amino acids, fatty acids, vitamins and various minerals Substances are mainly widely distributed along the coasts of the Yellow Sea, Bohai Sea and East China Sea in my country.

[0038] 2. Preparation of modifie...

Embodiment 1

[0048] (1) Add 300g NaHSO to a 2000mL three-necked round bottom flask 3 , add 500 mL of deionized water, and stir at 300 rpm until it is completely dissolved; raise the temperature to 80 °C, slowly add 265 g of 1,2-propylene oxide dropwise, and finish dropping within 3 hours. After the dropwise addition, continue the reaction for 2 hours. After the reaction is completed, it is cooled to room temperature, and the solid after suction filtration is recrystallized with deionized water, and repeated 3 times to obtain a white solid crystal sulfonated modifier, which is pulverized by a pulverizer, checked with a standard inspection sieve, and pulverized to 800 mesh ~ 1000 mesh, set aside for use; add 200 g of pretreated prolifera into a 2000 mL three-necked flat-bottomed flask, slowly add 50 g of the sulfonated modifier prepared earlier, and stir at a low speed of 100 rpm for 30 min. After adding, the temperature rises to 40 ° C, increase the stirring speed to 2000 rpm, and stir for ...

Embodiment 2

[0051] (1) Add 400g NaHSO to a 2000mL three-necked round bottom flask 3 , add 500 mL of deionized water, and stir at 300 rpm until completely dissolved; raise the temperature to 80 °C, slowly add 366 g of epichlorohydrin dropwise, and finish dropping within 3 hours. After the dropwise addition, continue the reaction for 2 hours. , cooled to room temperature, the solid after suction filtration was recrystallized with deionized water, and repeated 3 times to obtain a white solid crystal sulfonated modifier, which was pulverized with a pulverizer, tested with a standard inspection sieve, and pulverized to 800~1000 mesh. Use; add 300g of pretreated prolifera into a 2000mL three-necked flat-bottomed flask, slowly add 70g of the sulfonated modifier prepared earlier, stir at a low speed of 100rpm for 40min, after adding, the temperature rises to 45 ℃, the The stirring speed was increased to 2000 rpm and stirred for 2 hours. During the reaction, the pH of the system was strictly contr...

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Abstract

A composite fluid loss additive for drilling fluid based on modified prolifera, comprising: modified prolifera, temperature stabilizer, micron calcium carbonate, nano-silica and dispersant. The preparation method is as follows: adding deionized water and modified prolifera into a high-pressure homogenizer, adding a temperature stabilizer after homogenization, and homogenizing; adjusting the pH of the system, adding micron calcium carbonate, and continuing to homogenize; adding nanometer dioxide After the silicon is homogenized, a dispersant is added, and the homogenization is continued; the above product is dried and pulverized to obtain a composite filtrate reducer for drilling fluid based on modified prolifera. The filtrate reducer prepared by this method is at room temperature, after adding 2.0wt% modified prolifera compound filtrate reducer to the base slurry, the high temperature and high pressure (180℃ / 3.5MPa) filtration loss of the base slurry is reduced from 55mL To 12mL, the plugging rate of 500mD core increased from 35% to 92%, and the treatment agent is non-toxic, without any adverse effect on the environment, and the acute toxicity EC50>30000.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method, in particular, the drilling fluid needs to have a certain function of a fluid loss reducer during the drilling process, so as to reduce the entry of the drilling fluid filtrate into the formation and avoid causing corresponding wellbore instability , reservoir damage, etc. Background technique [0002] The strata encountered during the drilling process vary from mudstone, shale, sandstone, limestone, carbonate rock and their composite rocks, with varying porosity and permeability, and there may also be fractures or fractures. In karst cave formations, at this time, drilling fluid filtrate may enter the formation in a large amount. After the formation fluid and wellbore rocks come into contact with the drilling fluid fluid, it may cause wellbore instability and, in severe cases, wellbore collapse behavior. Therefore, it is generally necessary to add a certain amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/42
CPCC09K8/03C09K8/426C09K2208/12Y02P20/141
Inventor 蓝强张妍徐运波郑成胜刘振东于雷吴雄军陈健张虹
Owner 中石化石油工程技术服务有限公司
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