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A kind of anti-high temperature and anti-calcium protection oil and gas reservoir water-based drilling fluid fluid loss reducer and drilling fluid and its application

A technology of water-based drilling fluid and fluid loss control agent, which can be used in wellbore/well components, earthwork drilling, wellbore flushing, etc., and can solve problems such as inapplicability

Inactive Publication Date: 2021-05-18
CNPC DRILLING RES INST +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 defect that the existing water-based drilling fluid fluid loss additives are not suitable for high-temperature and high-calcium deep salt-gypsum formation drilling technology, and provide a high-temperature and anti-calcium protection water-based drilling fluid for oil and gas reservoirs. Lost agents and drilling fluids and their applications

Method used

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  • A kind of anti-high temperature and anti-calcium protection oil and gas reservoir water-based drilling fluid fluid loss reducer and drilling fluid and its application
  • A kind of anti-high temperature and anti-calcium protection oil and gas reservoir water-based drilling fluid fluid loss reducer and drilling fluid and its application
  • A kind of anti-high temperature and anti-calcium protection oil and gas reservoir water-based drilling fluid fluid loss reducer and drilling fluid and its application

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preparation example Construction

[0025] The present invention also provides a preparation method of a copolymer, the method comprising: in the presence of sodium lauryl sulfate and 2,2-azobis(2-methylpropylimidium) dihydrochloride, the formula ( 4) The monomer M1 shown in the formula (5), the monomer M2 shown in the formula (5), and the monomer M3 shown in the formula (6) are polymerized in water as a solvent,

[0026]

[0027] Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 9 , R 10 and R 11 each independently hydrogen, C 1 -C 4 Alkyl or C 1 -C 4 The alkoxy group of R is preferably hydrogen, methyl, ethyl, methoxy or ethoxy; R 8 from C 1 -C 4 The alkylene group is preferably methylene or ethylene.

[0028] Further preferably, R 1 , R 2 , R 3 , R 4 and R 5 each independently hydrogen, methyl or ethyl; R 6 , R 7 , R 9 , R 10 and R 11 is methyl; R 8 For methylene.

[0029] In the method of the present invention, the mass ratio of the monomer M1, the monomer M2 and the monome...

Embodiment approach

[0033] According to a preferred embodiment of the present invention, the process of the polymerization reaction comprises the following steps:

[0034] (1) Sodium lauryl sulfate is dissolved in water to obtain the first aqueous solution;

[0035] (2) Dissolving monomer M1, monomer M2 and monomer M3 in water to obtain a second aqueous solution;

[0036] (3) Dissolving 2,2-azobis(2-methylpropylimidium) dihydrochloride in water to obtain a third aqueous solution;

[0037] (4) Under the protection of nitrogen, the first aqueous solution and the second aqueous solution are mixed and contacted at 40-120° C., and then the third aqueous solution is added dropwise to react for 1-10 hours.

[0038] In step (1), the dissolving process of sodium lauryl sulfate is preferably carried out in a water bath, and the temperature of the water bath can be 40-120°C, most preferably 80°C.

[0039] In steps (1) to (3), the water used for dissolution may be deionized water or distilled water, prefer...

Embodiment 1

[0053] Adjust the temperature of the water bath to 80°C, dissolve sodium lauryl sulfate in distilled water and pour it into a three-necked flask, stir with a magnetic force at an appropriate speed for 15 minutes; add 100g of distilled water to a 100ml beaker, and add formula (4-1) The monomer M1 shown, the monomer M2 shown in the formula (5-1), and the monomer M3 shown in the formula (6-1). After completely dissolving, add it into the three-necked flask, and stir for 30 minutes under nitrogen protection; dissolve 2,2-azobis(2-methylpropylimidium) dihydrochloride in distilled water, and then add it dropwise Among them, the mass ratio of monomers M1, M2 and M3 is 0.15:1:0.075, monomer M2, sodium lauryl sulfate and 2,2-azobis(2-methylpropylimidium) dihydrochloride The mass ratio is 200:0.5:0.4. After reacting for 5 hours, copolymer A1 was obtained with a number average molecular weight of 42,000.

[0054]

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Abstract

The invention relates to the technical field of petroleum and natural gas drilling, and discloses a high temperature and calcium resistant water-based drilling fluid fluid loss reducer for oil and gas reservoir protection, drilling fluid and applications thereof. The anti-high temperature and anti-calcium protection oil and gas reservoir water-based drilling fluid fluid loss reducer contains the structural unit shown in formula (1), the structural unit shown in formula (2) and the structural unit shown in formula (3), wherein, The mass ratio of the structural unit shown in the formula (1), the structural unit shown in the formula (2) and the structural unit shown in the formula (3) is (0.1-0.2): 1: (0.05-0.1), the drop filter The number average molecular weight of the loss agent is 10,000 to 100,000. The water-based drilling fluid described in the present invention contains the fluid loss control agent, and the water-based drilling fluid can exhibit better inhibition, rheology, and filtration reduction during the drilling process of high-temperature and high-calcium deep salt-gypsum formations. Loss and protection of reservoir performance.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a high temperature and calcium resistant water-based drilling fluid fluid loss reducer for oil and gas reservoir protection, drilling fluid and application thereof. Background technique [0002] 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 reservoirs in my country is generally more than 5000m, and the deepest is nearly 9000m at present, the bottomhole temperature is 180-260℃, and there are large sections of salt-gypsum layers in most areas. At present, oil fields such as Daqing, Nanhai, Jilin, Xinjiang, Tarim, and Dagang are all implementing ultra-deep well drilling. Anti-ultra-high temperature and high calcium (CaCl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F212/08C08F212/12C08F220/18C09K8/035C09K8/26
CPCC08F220/58C09K8/035C09K8/26C08F220/585C08F212/08C08F220/1804C08F212/12C09K8/24C08F2800/20E21B21/003E21B21/062
Inventor 杨宇平刘敬平王瑛李龙张炎刘裕双房平亮郝围围张玮郭蕾李璐璐陶红梅
Owner CNPC DRILLING RES INST