A reservoir protective agent composition, a drilling fluid containing the composition and applications of the drilling fluid in low-permeability reservoir drilling

The technology of a reservoir protective agent and composition is applied in the field of oil drilling, which can solve the problems of unsatisfactory reservoir protection effect, filtrate invasion, water sensitivity, water lock damage, etc. The effect of rheological properties

Active Publication Date: 2017-04-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reservoir protection agent is added to the drilling fluid, the reservoir protection effect is not ideal because the characteristics of the low-permeability reservoir are not fully considered, and the filtrate often invades the reservoir, resulting in damage such as water sensitivity and water lock.

Method used

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  • A reservoir protective agent composition, a drilling fluid containing the composition and applications of the drilling fluid in low-permeability reservoir drilling
  • A reservoir protective agent composition, a drilling fluid containing the composition and applications of the drilling fluid in low-permeability reservoir drilling
  • A reservoir protective agent composition, a drilling fluid containing the composition and applications of the drilling fluid in low-permeability reservoir drilling

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Embodiment

[0059] 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, all materials used are commercially available, and the methods used are all conventional methods in the art.

[0060] 2-Acrylamido-2-methylpropanesulfonic acid was purchased from Chengdu Gracia Chemical Technology Co., Ltd.

[0061] Benzyl dithiobenzoate, α-isobutyronitrile dithionaphthoate, cumyl dithiobenzoate and cumyl dithiobenzoate were purchased from Nanjing Qiafenghe Pharmaceutical Technology Co., Ltd.

[0062]Styrene, p-methylstyrene, p-methoxystyrene, and n-butylstyrene were purchased from Chengdu Gracia Chemical Technology Co., Ltd.

[0063] Cetyltrimethylammonium chloride was purchased from Shanghai Fusheng Industrial Co., Ltd.

[0064] Sodium montmorillonite was purchased from Xinjiang Zhongfei Xiazijie Bentonite Co., Ltd.

[0065] A...

preparation example 1

[0068] 1. Preparation of organic montmorillonite

[0069] Put 5g of sodium montmorillonite, 3g of cetyltrimethylammonium chloride and 100ml of distilled water in a 250ml flask, stir at 120rpm in a water bath at 80°C for 4h, let stand overnight, remove the upper solution, filter, and wash with deionized water to no Cl - (with a concentration of 0.01mol / L AgNO 3 solution test), dried in a vacuum oven at 70°C, and crushed through a 300-mesh sieve to obtain organic montmorillonite (O-MMT).

[0070] 2. Preparation of nano-membrane structure reservoir protection agent

[0071] (1) In a three-necked flask equipped with a thermometer and a mechanical stirrer, add styrene, benzyl dithiobenzoate and azobisisobutyronitrile at a molar ratio of 400:1:0.4, and add styrene 5% by weight of organic montmorillonite, after sealing the reaction device, the air in the system was removed by freezing and vacuuming, filled with nitrogen, and circulated for 3 times, fully stirred under the protecti...

preparation example 2

[0074] Prepare organic montmorillonite according to the method of preparation example 1, and the preparation method of nano-membrane structure reservoir protection agent is as follows:

[0075] (1) In a three-necked flask equipped with a thermometer and a mechanical stirrer, add p-methylstyrene, cumyl dithiobenzoate and azobisisoheptanonitrile at a molar ratio of 200:1:0.3, And add organic montmorillonite accounting for 3% by weight of p-methylstyrene, seal the reaction device, remove the air in the system by freezing and evacuating, fill with nitrogen, cycle 3 times, fully stir under the protection of nitrogen, and heat at 130 ° C The reaction was carried out in an oil bath. After reacting for 2.5 hours, the reaction system was cooled with an ice-water bath, and the product was precipitated in methanol, filtered, and then dried in vacuum at 70° C. to obtain poly-p-methylstyrene / montmorillonite nanocomposite macromolecular chain transfer agent.

[0076] (2) In the there-necke...

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Abstract

The invention relates to the technical field of petroleum drilling and discloses a reservoir protective agent composition, a drilling fluid containing the composition and applications of the drilling fluid in low-permeability reservoir drilling. The composition includes a nanometer membrane structure reservoir protective agent and a wetting adjusting agent. The nanometer membrane structure reservoir protective agent includes a montmorillonoid sheet layer, a structure unit shown as a formula (1) and a structure unit shown as a formula (2), wherein R1, R2, R3, R4 and R5 respectively and independently represent hydrogen, C1-C4 alkyl or C1-C4 alkoxy, and R6 is C1-C6 alkylene. The drilling fluid containing the composition is also provided by the invention. When the drilling fluid is used for low-permeability reservoir drilling, the drilling fluid shows good rheological properties, temperature resistance, anticollapse performance and reservoir protecting performance.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a reservoir protection agent composition, a drilling fluid containing the reservoir protection agent composition and its application in low-permeability reservoir drilling. Background technique [0002] Drilling fluid is one of the important guarantees to ensure the safety, quality, efficiency and speed of drilling production operations. Drilling fluid must be used in oilfield development operations. [0003] Effective reservoir protection is an effective guarantee to achieve higher oil and gas recovery, so that the skin coefficient is negative to achieve the best. During the drilling process, if the drilling fluid is improperly designed or used, the liquid and solid in the drilling fluid will invade the reservoir and have physical and chemical interactions with the clay and other minerals in the reservoir, which will significantly reduce the oil formation near the wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/22C09K8/508C08F220/58C08F212/12C08F2/38C08F2/44
CPCC08F2/38C08F2/44C08F220/58C09K8/22C09K8/24C09K8/5083C08F220/585C08F212/12C09K8/035C09K2208/10
Inventor 孙金声刘敬平吕开河
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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