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Low-molecular-weight branched shale inhibitor and water-based drilling fluid thereof

A shale inhibitor and water-based drilling fluid technology, applied in the field of oil and gas field drilling, can solve the problems of clay entanglement, uneven coating, difficult access of polyamine compounds, limitation of inhibition performance, etc., and achieves safe and reliable formulation and improved inhibition performance. , the effect of stable performance

Active Publication Date: 2020-10-16
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the polyamine inhibitors studied and applied at present have a linear structure. For linear polyamine inhibitors, they usually have an irregular linear configuration after being dissolved in water. When they are used in the shale gas drilling process , the entanglement and coating on the clay are uneven, which is easy to cause repeated adsorption or no adsorption
At the same time, the active groups generally exist at both ends of the molecular chain, so that a molecular chain usually only contains two active groups. In this case, the effect of linear polyamine inhibitors often has certain limitations. , and the high molecular weight polyamine compound is difficult to enter the clay layer, so that its inhibitory performance is limited

Method used

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  • Low-molecular-weight branched shale inhibitor and water-based drilling fluid thereof
  • Low-molecular-weight branched shale inhibitor and water-based drilling fluid thereof
  • Low-molecular-weight branched shale inhibitor and water-based drilling fluid thereof

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Effect test

Embodiment 1

[0025] Using N-methyl-2-hydroxyethylamine, melamine, and diallyl sulfide as raw materials, it is synthesized by the following steps:

[0026] Weigh 9.75 g of N-methyl-2-hydroxyethylamine, 2.1 g of melamine, and 14.82 g of diallyl sulfide. Dissolve N-methyl-2-hydroxyethylamine and diallyl sulfide in 80 ml of methanol, and dissolve melamine in 50 ml of methanol. Then put the methanol solution of N-methyl-2-hydroxyethylamine in a three-necked flask, and titrate the diallyl sulfide methanol solution at a speed of about 1 d / s in an ice-water bath under the condition of nitrogen gas. After the dropwise addition was completed, the temperature was raised to 30° C. for 8 hours. After the reaction was completed, the solvent was distilled off under reduced pressure to obtain the product.

[0027] The product obtained in the previous step was dissolved in 100 ml of methanol and placed in a three-necked flask, then the melamine solution was added into the three-necked flask, and the tempe...

Embodiment 3

[0036] Preparation of water-based drilling fluid:

[0037] The water-based drilling fluid system of this embodiment is composed of the following substances: water, inhibitor, bentonite, sodium carbonate, viscosifier, fluid loss reducer, pH regulator, lubricant, plugging agent, and weighting agent. And based on 100 parts by weight of water, the content of low molecular weight branched shale inhibitor is 1-5 parts by weight, the content of bentonite is 10 parts by weight, the content of sodium carbonate is 0.5 parts by weight, and the content of viscosifier is 5 parts by weight. In parts by weight, the content of the fluid loss reducer is 4 parts by weight, the content of the pH regulator is 1 part by weight, the content of the plugging agent is 5 parts by weight, the content of the lubricant is 0.5 parts by weight, and the content of the weighting agent is 40 parts by weight.

[0038] Among them, the low molecular weight branched shale inhibitor is A1 and A2 successfully prepar...

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Abstract

The invention discloses a low-molecular-weight branched shale inhibitor and a water-based drilling fluid thereof, belongs to the technical field of oil and gas field drilling, the inhibitor is prepared from a compound containing a secondary amino group, melamine and diallyl sulfide, and can be directly added into drilling fluid base slurry to form a water-based drilling fluid system. The low-molecular-weight branched shale inhibitor and the water-based drilling fluid thereof provided by the invention can effectively inhibit shale expansion, have good temperature resistance, have good compatibility with other treating agents, can play a role in inhibiting for a long time, and are simple in synthesis method, easily available in raw materials and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a low molecular weight branched shale inhibitor and its water-based drilling fluid. Background technique [0002] Borehole wall instability has always been a worldwide problem that needs to be overcome in the drilling process. It often leads to complex accidents such as well wall collapse, diameter shrinkage, and pipe sticking, which increases drilling time and drilling costs. According to statistics, 75% of wellbore instability problems mainly occur in shale formations, especially water-sensitive formations. Shale formations have high clay mineral content, shale gas horizontal wells have long horizontal sections, and drilling fluids are in contact with formations. If the time is long, the shale hydration will be more serious, and the wellbore instability will be more prominent. Although oil-based drilling fluid has the advantages of high temperature resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C07D251/70C09K8/22
CPCC09K8/035C07D251/70C09K8/22
Inventor 王俊梅谢刚罗玉婧马仁杰王琦白杨罗平亚
Owner SOUTHWEST PETROLEUM UNIV
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