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A low molecular weight branched shale inhibitor and its water-based drilling fluid

A shale inhibitor and water-based drilling fluid technology, which is applied in the field of oil and gas field drilling, can solve the problems of clay entanglement, uneven coating, difficult entry of polyamine compounds, and limitation of inhibition performance, so as to achieve safe and reliable formula and improved inhibition performance , the effect of stable performance

Active Publication Date: 2022-04-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • 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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  • A low molecular weight branched shale inhibitor and its water-based drilling fluid
  • A low molecular weight branched shale inhibitor and its water-based drilling fluid
  • A low molecular weight branched shale inhibitor and its water-based drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take N-methyl-2-hydroxyethylamine, melamine, diallyl sulfide as raw materials and adopt the following steps to synthesize:

[0026] Weigh out 9.75 g of N-methyl-2-hydroxyethylamine, 2.1 g of melamine and 14.82 g of diallyl sulfide. N-methyl-2-hydroxyethylamine and diallyl sulfide were respectively dissolved in 80 ml methanol, and melamine was dissolved in 50 ml methanol. Then, the methanol solution of N-methyl-2-hydroxyethylamine was placed in a three-necked flask, and the methanol solution of diallyl sulfide was titrated at a rate of about 1 d / s in an ice-water bath and nitrogen flow. After the dropwise addition was completed, the temperature was raised to 30° C. to react for 8 h. 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, and then the melamine solution was added to the three-necke...

Embodiment 3

[0036] Preparation of water-based drilling fluid:

[0037] The water-based drilling fluid system of this embodiment is made up of the following materials: water, inhibitor, bentonite, sodium carbonate, tackifier, fluid loss reducer, pH adjuster, lubricant, plugging agent, and weighting agent. And based on 100 parts by weight of water, the content of the 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 the tackifier is 5 parts by weight. In parts by weight, the content of fluid loss reducer is 4 parts by weight, the content of pH regulator is 1 part by weight, the content of plugging agent is 5 parts by weight, the content of lubricant is 0.5 parts by weight, and the content of weighting agent is 40 parts by weight.

[0038] The low molecular weight branched shale inhibitor is A1 and A2 successfully prepared in Examples 1 and 2, the tac...

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Abstract

The invention discloses a low-molecular-weight branched shale inhibitor and its water-based drilling fluid, belonging to the technical field of oil and gas field drilling. The low-molecular-weight branched shale inhibitor is composed of a compound containing secondary amino groups, melamine and diene Propyl sulfide is prepared as a raw material, and the shale intercalation inhibitor can be directly added to the drilling fluid base slurry to form a water-based drilling fluid system. The low-molecular-weight branched shale inhibitor and its water-based drilling fluid provided by the invention can effectively inhibit shale expansion, have good temperature resistance, and have good compatibility with other treatment agents, and can exert long-term inhibitory effects. The method is simple, the raw material is easy to obtain, and is 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 a water-based drilling fluid thereof. Background technique [0002] Borehole 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 the wellbore instability problems mainly occur in shale formations, especially water-sensitive formations. The shale formations have high content of clay minerals, long horizontal sections of shale gas horizontal wells, and the drilling fluid is in contact with the formation. For a long time, the shale hydration is more serious, and the wellbore instability is more prominent. Although oil-based drilling fluid has the advantages of high temperature resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C07D251/70C09K8/22
CPCC09K8/035C07D251/70C09K8/22
Inventor 谢刚罗玉婧邓明毅王俊梅白杨罗平亚马仁杰
Owner SOUTHWEST PETROLEUM UNIV
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