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A kind of composite plugging agent for oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and composite technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of low leakage plugging success rate, improve the leakage plugging success rate, wide source of raw materials, and on-site operation. Easy-to-use effects

Active Publication Date: 2018-09-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of low plugging success rate in the prior art, the invention provides a composite plugging agent for oil-based drilling fluid and its preparation method. The principle of the composite plugging agent is to use inert three-dimensional plugging materials, pro- Oil-based two-dimensional sheet material and one-dimensional fiber material are bridged to form a plugging layer. At the same time, the time-delayed expansion oil-swellable material and lipophilic ultrafine particle material enter the plugging layer to seal and limit penetration. The effect of plugging and controlling leakage, the composite plugging agent can significantly improve the success rate of oil-based drilling fluid plugging

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  • A kind of composite plugging agent for oil-based drilling fluid and preparation method thereof

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Embodiment 1

[0028] In order to overcome the problem of low plugging success rate in the prior art, the invention provides a composite plugging agent for oil-based drilling fluid and its preparation method. The principle of the composite plugging agent is to use inert three-dimensional plugging materials, pro- Oil-based two-dimensional sheet material and one-dimensional fiber material are bridged to form a plugging layer. At the same time, the time-delayed expansion oil-swellable material and lipophilic ultrafine particle material enter the plugging layer to seal and limit penetration. The composite plugging agent can significantly improve the plugging success rate of oil-based drilling fluid.

[0029] A composite plugging agent for oil-based drilling fluid: raw materials by weight percentage:

[0030] Plugging material 20%;

[0031] Fiber material 0.5%;

[0032] Oil swelling material 20%;

[0033] Lipophilic ultrafine particle material 40%;

[0034] Lipophilic sheet material 19.5%.

...

Embodiment 2

[0038] A composite plugging agent for oil-based drilling fluid: raw materials by weight percentage:

[0039] Plugging material 35%;

[0040] Fiber material 1%;

[0041] Oil swelling material 19%;

[0042] Lipophilic ultrafine particle material 30%;

[0043] Lipophilic sheet material 15%.

[0044] The plugging material has good lipophilic dispersibility. In the past, most of the plugging agents used hydrophilic plugging materials. The core materials of the composite plugging agent for oil-based drilling fluid of the present invention include two-dimensional flake material elastic graphite, ultra-fine particle material talc powder and delayed expansion All oil-swellable materials are lipophilic materials, which can be well dispersed in oil-based drilling fluids to avoid agglomeration and exert the effect of leak prevention and plugging.

[0045] In this embodiment, the plugging material is limestone powder, and the limestone powder in the plugging material is used in combin...

Embodiment 3

[0052] In this embodiment, a composite plugging agent for oil-based drilling fluid: raw materials by weight percentage:

[0053] Plugging material 50%;

[0054] Fiber material 2%;

[0055] Oil swelling material 18%;

[0056] Lipophilic ultrafine particle material 20%;

[0057] Oleophilic sheet material 10%.

[0058] The plugging material has good lipophilic dispersibility. In the past, most of the plugging agents used hydrophilic plugging materials. The core materials of the composite plugging agent for oil-based drilling fluid of the present invention include two-dimensional flake material elastic graphite, ultra-fine particle material talc powder and delayed expansion All oil-swellable materials are lipophilic materials, which can be well dispersed in oil-based drilling fluids to avoid agglomeration and exert the effect of leak prevention and plugging.

[0059] In this embodiment, the plugging material is limestone powder, and the limestone powder in the plugging materi...

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Abstract

The invention provides a composite type leakage plugging agent for an oil-based drilling fluid. The composite type leakage plugging agent for the oil-based drilling fluid comprises the raw materials by the weight percentage: 20%-50% of a leakage plugging material, 0.5%-2% of a fiber material, 5%-20% of an oil swelling material, 20%-40% of a lipophilic superfine particle material, and 10%-20% of a lipophilic flaky material. The leakage plugging agent mainly aims at leakage prevention and plugging requirements of permeable formation and fractured leakage formation encountered by an oil-based drilling fluid system during drilling, and the compressive strength can reach 7 MPa for 5 mm cracks; in sand bed evaluation tests, the invasion depth reduction rate is more than 90%. The composite type leakage plugging agent can significantly improve the leakage plugging success rate of the oil-based drilling fluid and enhances the formation bearing ability.

Description

technical field [0001] The invention relates to the field of drilling fluid treatment agents used in the drilling process, in particular to a composite plugging agent for oil-based drilling fluid and a preparation method thereof. Background technique [0002] Compared with traditional water-based drilling fluids, oil-based drilling fluids have many advantages such as strong inhibition and anti-slump performance, excellent lubricating properties, good rheological properties, strong temperature resistance, and strong anti-pollution performance. Therefore, oil-based drilling fluids have been widely used in Drilling construction for the development of domestic tight oil, tight gas, shale oil, gas horizontal wells and other unconventional oil and gas resources. However, when lost circulation occurs during the drilling process of oil-based drilling fluid, it will seriously endanger the safety of drilling operations, especially the high cost of oil-based drilling fluid will cause g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/32C09K8/42
CPCC09K8/03C09K8/32C09K8/426C09K2208/04C09K2208/08
Inventor 刘伟张小平涂海海王勇强俞浩杰赵建震王京光吴超吴满祥胡恒赵海锋曹辉寄晓宁
Owner BC P INC CHINA NAT PETROLEUM CORP
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