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High-temperature-resistant high-mineralization high-density water-based drilling fluid and application thereof

A water-based drilling fluid, high temperature resistant technology, applied in the field of drilling, can solve the problems of slow drilling speed, high cost, blowout, etc., and achieve the effect of good suppression

Active Publication Date: 2018-10-12
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anti-ultra-high temperature, high density and high salinity (saturated NaCl, CaCl 2 ≥1%) drilling fluid is the key to successful drilling in deep salt-gypsum formations, but the existing high-density and high-salinity drilling fluids are difficult to meet the ultra-high temperature resistance requirements in high-density and large-section salt-gypsum formations. Major technical problems such as well wall collapse, pipe sticking and blowout caused by high temperature failure of drilling fluid
During deep drilling, high-temperature failure of the drilling fluid makes it difficult to carry rock and suspend heavy materials, and it is difficult to effectively support the well wall, which may easily lead to major safety accidents such as well collapse, drill sticking, and blowout, and even lead to the scrapping of the wellbore
At present, water-based drilling fluids are used to drill ultra-high temperature wells in salt-bearing gypsum formations. The main method is to increase the amount of chemical treatment agents to maintain the performance of the drilling fluid. Slow drilling cycle, long drilling cycle, high production safety and public safety risks seriously affect the quality, speed and efficiency of drilling, and even affect the realization of geological goals

Method used

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  • High-temperature-resistant high-mineralization high-density water-based drilling fluid and application thereof
  • High-temperature-resistant high-mineralization high-density water-based drilling fluid and application thereof
  • High-temperature-resistant high-mineralization high-density water-based drilling fluid and application thereof

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preparation example Construction

[0016] In a second aspect, the present invention provides a method for preparing the high temperature resistant fluid loss control agent, the method comprising: in the presence of water as a solvent, a surfactant and an initiator, chlorinating dimethyl diallyl Ammonium, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylacrylamide and p-methylstyrene were polymerized.

[0017] In the method of the present invention, relative to 100 parts by weight of water, the amount of the surfactant can be 0.1-0.5 parts by weight, the amount of the initiator can be 8-12 parts by weight, the dimethyl The consumption of diallyl ammonium chloride can be 1-10 weight part;

[0018] In the method of the present invention, methyl diallyl ammonium chloride, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylacrylamide and p-methylstyrene The molar ratio of the amount used can be 1: (0.5-3): (1-5): (0.5-5): (0.5-4), preferably 1: (1.5-2.5): (3-5): (1 -3): (1-3).

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Embodiment

[0035] The present invention will be described in detail through examples below, but the present invention is not limited thereby. In the following preparation examples, examples and comparative examples, unless otherwise specified, the materials used are all commercially available, and the methods used are all conventional methods in the art.

[0036] Sulfonated lignite SMC, sulfonated lignite resin SPNH, sulfomethyl phenolic resin SMP-II and sulfonated asphalt were provided by China Petroleum Engineering Research Institute.

[0037] Polymer coating agent JT888, graphite and potassium chloride were purchased from Chengdu Chunfeng Petroleum Technology Co., Ltd.

[0038] Bentonite was purchased from Xinjiang Zhongfei Xiazijie Bentonite Co., Ltd.

[0039] The anti-high temperature fluid loss reducer is obtained according to the following preparation examples.

[0040] Dimethyldiallyl ammonium chloride, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylacrylami...

preparation example 1

[0043] In a three-necked flask equipped with a thermometer and a mechanical stirrer, dissolve 5g of 2-acrylamido-2-methylpropanesulfonic acid in 100g of deionized water, and , 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylacrylamide and p-methylstyrene in a molar ratio of 1:2:4:2:2, add acrylamide in sequence , N,N-dimethylacrylamide, dimethyldiallylammonium chloride and p-methylstyrene, add 0.3g of sodium lauryl sulfate, adjust the pH of the solution to 7 with sodium hydroxide, and react After the device was sealed, it was flushed with nitrogen and stirred thoroughly, and 10 g of azobisisobutyramide hydrochloride with a mass concentration of 1% was added, and reacted at 50° C. for 6 hours to obtain a viscous liquid product. The obtained product was repeatedly purified with acetone, dried and pulverized at 100°C to obtain powdered high temperature resistant fluid loss reducer A1.

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Abstract

The invention relates to the technical field of drilling. The invention discloses a high-temperature-resistant filtrate reducer, a preparation method thereof, a water-based drilling fluid and an application of the water-based drilling fluid. The high-temperature-resistant filtrate reducer is formed by the copolymerization of a monomer composition, and the monomer composition comprises dimethyl diallyl ammonium chloride, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylacrylamide and p-methylstyrene. The invention also provides the water-based drilling fluid containing the high-temperature-resistant filtrate reducer provided by the invention. When the water-based drilling fluid containing the high-temperature-resistant filtrate reducer is applied to the boring under a deephigh-temperature (220 DEG C) high-mineralization (saturated salt, containing 1.0% of CaCl2) condition, the water-based drilling fluid can show good inhibition, rheology and filter reduction performance.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a high-temperature anti-fluid loss reducer, a preparation method thereof, a water-based drilling fluid and an application thereof. Background technique [0002] As a strategic resource, oil and gas have an important impact on a country's economic security and stable development. With the rapid increase of my country's demand for oil and natural gas and the depletion of shallow oil and gas resources, the dependence of my country's economic and industrial growth on foreign oil continues to increase. The severe energy situation urgently requires new replaceable oil and gas resources. According to the results of the second national oil and gas resource evaluation, the total oil resources in my country are 94 billion tons, and the conventional natural gas resources are 38 trillion m 3 , the remaining oil and gas resources are mainly distributed in deep layers. The depth of deep res...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24C08F220/58C08F220/56C08F220/54C08F212/12C08F226/02
CPCC08F220/58C08F220/585C09K8/035C09K8/24C08F220/56C08F220/54C08F212/12C08F226/02
Inventor 刘敬平孙金声吕开河黄贤斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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