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Deepwater drilling fluid

A deepwater drilling and seawater technology, applied in the field of drilling fluid, can solve the problems of less environmental pollution and low cost of raw materials, and achieve the effects of less environmental damage, good rheology, and obvious hydrate inhibition effect.

Active Publication Date: 2015-04-29
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiencies of the prior art, and the technical problem to be solved by the present invention is to prepare a deep-water drilling fluid with inhibitory performance, which can meet various technical requirements for deep-water oil and gas drilling, and has little environmental pollution and low raw material Features such as low cost

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adopt the base slurry of 2% (1# drilling fluid), 2.5% (2# drilling fluid), 3% (3# drilling fluid) in the present embodiment, the preparation method of the drilling fluid used is as follows (in the following each embodiment Both use this drilling fluid):

[0018] At room temperature, 1# drilling fluid weighs the required raw materials according to the following amount: 3L seawater (mainly composed of sodium chloride, potassium chloride, magnesium sulfate and other salts, with a salt content of 34.4‰), 60g bentonite, 2.4g Soda ash, 3g xanthan gum XC, 30g Na-CMC (preferably viscosity 1400-2000mPa·s, degree of substitution 0.7-0.8), 60g SMP-2, 90g sodium silicate, 30g PVP-K90, 45g KAHM, 150g chloride Sodium, 1.5g DBS, 1.5g graphite, 0.6g paraformaldehyde.

[0019] 2# Drilling fluid weighs the required raw materials according to the following amount: 3L seawater (mainly composed of sodium chloride, potassium chloride, magnesium sulfate and other salts, with a salt content o...

Embodiment 2

[0023] According to domestic and foreign marine drilling practices, it is generally advisable to control the circulating temperature of drilling fluid in the range of 0-6°C during deepwater drilling. In order to test the characteristics of the drilling fluid at low temperature, the temperature in this example is selected to measure the conventional performance of the three drilling fluids developed in the range of -6-6°C, so as to evaluate the performance of the drilling fluid at low temperature. The instruments used in this embodiment include a digital display liquid density meter, a rotational viscometer, a fluid loss tester, and the like.

[0024] Table 1 Conventional properties of 1# drilling fluid at different temperatures

[0025]

[0026]

[0027] Table 2 Conventional properties of 2# drilling fluid at different temperatures

[0028]

[0029] Table 3 Conventional properties of 3# drilling fluid at different temperatures

[0030]

[0031]

[0032] It can...

Embodiment 3

[0034] In the process of deepwater drilling, deepwater formations often contain large sections of shale and other unstable rock formations. During the drilling process, if the filtration loss of drilling fluid is large, the shale is easy to hydrate and expand, resulting in instability of the wellbore. lead to drilling accidents. In this example, shale samples were soaked in the above-prepared drilling fluids, and their linear expansion rate was tested by a shale dilatometer to evaluate whether the above drilling fluids had good shale hydration inhibition. The measurement was carried out in the temperature range of 0-6° C., and the experiment time was 24 hours. The measurement results are as follows.

[0035] Table 4. Linear expansion test results of 1# drilling fluid mud shale at different temperatures

[0036]

[0037]

[0038] Table 5. Linear expansion test results of shale with 2# drilling fluid at different temperatures

[0039]

[0040] Table 6. Linear expansio...

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Abstract

The invention discloses a deepwater drilling fluid. Every 1L of base slurry is composed of 1g of xanthan gum XC, 10-20g of sodium carboxymethyl cellulose, 20-30g of sulfonated phenol formaldehyde resin SMP-2, 30-50g of sodium silicate, 10g of polyvinylpyrrolidone PVP-K90, 15g of high modified asphalt KAHM, 50-100g of sodium chloride, 0.5g of sodium dodecyl benzene sulfonate, 0.5-1g of graphite and 0.2-0.5g of polyformaldehyde. The drilling fluid has the advantages of stable properties under cold conditions, favorable rheological behavior, high debris carrying capacity, excellent mud shale hydration expansion inhibition capacity, excellent hydrate generation inhibition capacity, low economic cost and small environmental pollution, and is especially suitable for deepwater drilling.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a drilling fluid with good hydrate inhibition performance and suitable for deep water drilling. Background technique [0002] In recent years, with the increasing proportion of offshore oil and gas exploration and development, deep-sea oil and gas drilling and development have become more and more important in energy development. However, in deep-sea oil and gas drilling and development, the operating environment is harsh and the operating conditions are complex, and many complex technical problems are faced, including low drilling environment temperature during drilling, large amount of drilling fluid, poor stability of seabed shale, difficulty in wellbore cleaning, drilling The obtained gas forms hydrates in the drilling fluid and other problems, which brings severe challenges to the drilling and completion work. [0003] Drilling fluid is a circulating fluid used in rotary drilling. Since ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/16C09K8/206C09K8/22C09K8/24C09K2208/12C09K2208/22C09K2208/34
Inventor 何勇梁德青唐翠萍徐永霞
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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