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Temperature-resistant and salt-tolerant high-efficiency filtrate reducer for drilling fluid and preparation method thereof

A technology of temperature and salt resistance, fluid loss control agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the failure, thermal decomposition of polymer fluid loss control agent, temperature resistance, temperature resistance performance To achieve the effect of improving temperature and salt resistance, excellent filtration performance, and excellent temperature and salt resistance

Active Publication Date: 2021-06-01
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fluid loss reducers mainly reduce fluid loss by increasing the viscosity of the drilling fluid system, chemical adsorption, and physical filling. Solve the challenges of filtration performance and rheological properties of drilling fluids brought about by high temperature, high pressure and high saline geological conditions in deep wells, ultra-deep wells and geothermal wells
[0004] At present, relevant research shows that the traditional polymer fluid loss control agent is used, and its mechanism is mainly to improve the particle size distribution in the drilling fluid system by adsorbing clay particles, and then improve the compactness of the filter cake to control the fluid loss of the drilling fluid. However, after high-temperature circulation at the bottom of the drilling fluid, the high-molecular polymer fluid loss control agent decomposes and becomes invalid, thus losing the ability to control the fluid loss of the drilling fluid

Method used

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  • Temperature-resistant and salt-tolerant high-efficiency filtrate reducer for drilling fluid and preparation method thereof
  • Temperature-resistant and salt-tolerant high-efficiency filtrate reducer for drilling fluid and preparation method thereof
  • Temperature-resistant and salt-tolerant high-efficiency filtrate reducer for drilling fluid and preparation method thereof

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Embodiment 1

[0059] The invention relates to a method for preparing a temperature-resistant and salt-resistant high-efficiency fluid loss reducer for drilling fluid, which is specifically implemented according to the following steps:

[0060] Step 1, preparing zwitterionic polymers by free radical polymerization in aqueous solution, specifically:

[0061] Step 1.1, weigh the following components according to mass percentage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS) 10%, maleic anhydride (MA) 5%, methacryloyloxyethyltrimethyl Ammonium chloride (DMC) 7.5%, sodium styrene sulfonate (SSS) 2.5%, calcium sulfate whisker (CSW) 1.5%, ammonium persulfate (APS) 2.5%, the balance is deionized water, the mass of the above components The sum of the percentages is 100%;

[0062] Step 1.2, pretreatment stage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), maleic anhydride (MA) are dissolved in 33wt% deionized water, and placed in a device with cooling reflux and electric stirring In a four-n...

Embodiment 2

[0074] The invention relates to a method for preparing a temperature-resistant and salt-resistant high-efficiency fluid loss reducer for drilling fluid, which is specifically implemented according to the following steps:

[0075] Step 1, preparing zwitterionic polymers by free radical polymerization in aqueous solution, specifically:

[0076] Step 1.1, weigh the following components according to mass percentage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS) 10%, maleic anhydride (MA) 5%, methacryloyloxyethyltrimethyl Ammonium chloride (DMC) 5%, sodium styrene sulfonate (SSS) 5%, calcium sulfate whisker (CSW) 1.5%, ammonium persulfate (APS) 2.5%, and the balance is deionized water. The sum of the percentages is 100%;

[0077] Step 1.2, pretreatment stage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), maleic anhydride (MA) are dissolved in 33wt% deionized water, and placed in a device with cooling reflux and electric stirring In a four-necked flask; methacryloxyethyltri...

Embodiment 3

[0088] The invention relates to a method for preparing a temperature-resistant and salt-resistant high-efficiency fluid loss reducer for drilling fluid, which is specifically implemented according to the following steps:

[0089] Step 1, preparing zwitterionic polymers by free radical polymerization in aqueous solution, specifically:

[0090] Step 1.1, weigh the following components according to mass percentage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS) 12.5%, maleic anhydride (MA) 2.5%, methacryloyloxyethyltrimethyl Ammonium chloride (DMC) 5%, sodium styrene sulfonate (SSS) 5%, calcium sulfate whisker (CSW) 1.5%, ammonium persulfate (APS) 2.5%, and the balance is deionized water. The sum of the percentages is 100%;

[0091] Step 1.2, pretreatment stage: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), maleic anhydride (MA) are dissolved in 33wt% deionized water, and placed in a device with cooling reflux and electric stirring In a four-necked flask; methacryloxyethy...

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Abstract

The invention discloses a temperature-resistant and salt-tolerant high-efficiency filtrate reducer for drilling fluid. The temperature-resistant and salt-tolerant high-efficiency filtrate reducer is prepared by blending a zwitterionic polymer and modified nano-SiO2; the zwitterionic polymer is prepared from 2-acrylamido-2-methylpropanesulfonic acid, maleic anhydride, methacryloyloxyethyl trimethyl ammonium chloride, sodium p-styrenesulfonate, calcium sulfate whiskers, ammonium persulfate and deionized water. The invention also discloses a preparation method of the filtrate reducer, and the method comprises the following steps of: firstly, preparing the zwitterionic polymer through free radical polymerization of an aqueous solution; then, adopting KH-550 for surface hydrophobization modification on the nano-SiO2; and finally, blending the zwitterionic polymer and the modified nano-SiO2 so as to obtain the filtrate reducer. The temperature-resistant and salt-tolerant high-efficiency filtrate reducer for the drilling fluid is excellent in temperature resistance and salt tolerance, and the filtration performance of a drilling fluid system can be effectively improved.

Description

technical field [0001] The invention belongs to the cross-technical field of polymer chemistry and petroleum drilling and completion, and in particular relates to a high-efficiency fluid loss reducer for drilling fluids with resistance to temperature and salt, and also relates to a preparation method of the fluid loss reducer. Background technique [0002] As oil and gas exploration and development continue to advance to deep wells, ultra-deep wells and complex wells, the depth of oil and gas drilling continues to increase, and special oil and gas reservoir geological conditions such as high temperature, high pressure and high salinity are gradually increasing, and the development of unconventional resources such as geothermal energy is increasing. The number of large, high-temperature wells and ultra-high-temperature wells has also increased. The temperature-resistant and salt-resistant water-based drilling fluid is the key to ensuring the success of drilling operations, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F222/06C08F220/34C08F212/14C08F2/44C09K8/03C09K8/24
CPCC08F220/585C08F2/44C09K8/03C09K8/24C08F222/06C08F220/34C08F212/30
Inventor 霍锦华车远军余柏松秋列维刘宏臣
Owner XI'AN POLYTECHNIC UNIVERSITY
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