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A high-temperature and high-density freshwater drilling fluid

A high-density, drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor pollution resistance and insufficient temperature resistance, and achieve good rheology, high temperature and high pressure filtration, strong Effects of Inhibition and Pollution Resistance

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of insufficient temperature resistance and poor pollution resistance of existing drilling fluids under high-density conditions, and provide a high-temperature and high-density freshwater drilling fluid with strong high temperature resistance, high controllable density and good pollution resistance

Method used

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  • A high-temperature and high-density freshwater drilling fluid
  • A high-temperature and high-density freshwater drilling fluid
  • A high-temperature and high-density freshwater drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Dissolve 24g of sodium hydroxide in 200mL of water to form a solution, then add 72g of sodium 2-acryloyloxy-2-vinylmethylpropanesulfonate, 44g of N,N-dimethylacrylamide, 80g of acrylamide, 43g of acrylic acid to fully react, adjust the pH of the system to 9, raise the temperature to 60°C, add 0.4g of initiator potassium persulfate, and react for 45min under stirring conditions to obtain a gel-like or solid-like product, the product Dry and pulverize at 120°C to obtain comb polymer fluid loss additive A.

Embodiment 2

[0015] Dissolve 12g of sodium hydroxide in 186mL of water to form a solution, then add 60g of sodium 2-acryloyloxy-2-vinylmethylpropanesulfonate, 40g of N,N-dimethylacrylamide, 80g of acrylamide and 21.6g of acrylic acid are fully reacted, the pH of the system is adjusted to 9, the temperature is raised to 60°C, 0.24g of initiator potassium persulfate is added, and the reaction is carried out for 45min under stirring conditions to obtain a gel-like or solid-like product. The product was dried and pulverized at 120°C to obtain the comb polymer fluid loss control agent A.

[0016] Other specific examples 3-6 were prepared according to the components given in Table 1.

[0017] Table 1 Examples of comb-shaped polymer fluid loss reducer A (units are in mass percent)

[0018]

[0019] An embodiment of a high-temperature high-density freshwater drilling fluid:

[0020] Example 1:

[0021] Add 9.5g of sodium bentonite to 335mL of water, stir at high speed for 20 minutes, put it ...

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Abstract

The invention discloses a high-temperature and high-density freshwater drilling fluid, which uses 0.2% to 1.0% of sodium bentonite, 0.2% to 1.0% of comb-type polymer fluid loss reducer A, 1% to 4% of sulfonated lignite phenolic resin, sulfonate It is obtained by mixing lignite 0.5%-2%, NaOH 0.1%-0.5%, barite 60%-75%, and water as the balance, and aging at high temperature after mixing according to mass percentage. The formed high-temperature and high-density freshwater drilling fluid has a temperature resistance of 260°C and a density of 2.6g / cm3, which is suitable for deep well and ultra-deep well oil drilling and development technology.

Description

Technical field: [0001] The invention relates to a high-temperature and high-density freshwater drilling fluid, which belongs to the technical field of oil drilling and development of deep wells and ultra-deep wells. Background technique: [0002] With the development of the oil industry and the increasing demand for oil, the exploration and development of oil and gas fields gradually produce and exploit oil and gas reservoirs with harsh environments, and the transition from shallow formations to deep formations and from shallow seas to deep seas is becoming more and more difficult. One of the important The performance is the increase of well depth, and 73% of my country's unproven oil reserves and 52% of natural gas reserves are buried in deep formations, and exploration and development in deep formations has become inevitable. With the deepening of the well depth, the temperature and pressure of the formation increase, so the drilling fluid is faced with the difficulties of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/14C09K8/24
Inventor 王中华王旭胡小燕周乐群王亚彬
Owner CHINA PETROLEUM & CHEM CORP