Plugging agent capable of enhancing plugging performance of drilling fluid as well as plugging method and application thereof

A plugging performance and drilling fluid technology, applied in the field of enhancing drilling fluid performance, can solve problems such as difficult plugging of micro-pores and micro-fractures, lack of research on plugging layers, poor plugging effect, etc., to solve the problem of wellbore instability , Satisfy the effect of safe and fast drilling and excellent plugging performance

Pending Publication Date: 2020-09-22
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

[0008] The object of the present invention is to overcome above-mentioned deficiencies in the prior art, provide a kind of plugging agent that can strengthen drilling fluid plugging performance and its plugging method and application, overcome 1 in the prior art: existing plugging agent size is relatively small Most of the shale pores in my country are at the nanometer level. In the past, the conventional plugging agent has a large particle size, which is far larger than the shale pore size. It is difficult to seal micro-pores and micro-cracks, which will cause the filtrate to enter the formation and cause the well wall to become unstable; 2 : Adopt the method th

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  • Plugging agent capable of enhancing plugging performance of drilling fluid as well as plugging method and application thereof
  • Plugging agent capable of enhancing plugging performance of drilling fluid as well as plugging method and application thereof
  • Plugging agent capable of enhancing plugging performance of drilling fluid as well as plugging method and application thereof

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Example Embodiment

[0043] The specific implementation of the present invention is described below in conjunction with examples:

[0044] It should be noted that the structure, ratio, size, etc. illustrated in this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the implementation of the present invention. Any structural modification, proportional relationship change, or size adjustment should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0045] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the text. The scope of implementation of the invention, the change or adjustment of its relative relationship,...

Example Embodiment

[0046] Example 1

[0047] The invention discloses a plugging method capable of enhancing the plugging performance of drilling fluid, which comprises the following steps:

[0048] Step 1) Choose two different types of plugging agents according to the fracture situation of the drilling formation, one of which is an inert particle and the other is a deformable polymer;

[0049] Step 2) Add two different types of plugging agents to the drilling fluid, wherein the addition amount of inert particles is 2.0% to 4.0% of the drilling fluid, and the addition amount of deformable polymer is 1.0% to 3.0% of the drilling fluid %;

[0050] Step 3) Pump the drilling fluid with two different types of plugging agents into the drilling. The inert particles in the drilling fluid can quickly enter the formation cracks and bridge to form an internal plugging layer; the deformable polymer is formed in the inert particles On the basis of the inner sealing layer, micro-crosslinking can be deformed and seale...

Example Embodiment

[0051] Example 2

[0052] The invention discloses a plugging method capable of enhancing the plugging performance of drilling fluid, which comprises the following steps:

[0053] Step 1) Choose two different types of plugging agents according to the fracture situation of the drilling formation, one of which is an inert particle and the other is a deformable polymer;

[0054] Step 2) Add two different types of plugging agents to the drilling fluid, wherein the addition amount of inert particles is 2.0% to 4.0% of the drilling fluid, and the addition amount of deformable polymer is 1.0% to 3.0% of the drilling fluid %;

[0055] Step 3) Pump the drilling fluid with two different types of plugging agents into the drilling. The inert particles in the drilling fluid can quickly enter the formation cracks and bridge to form an internal plugging layer; the deformable polymer is formed in the inert particles On the basis of the inner sealing layer, micro-crosslinking can be deformed and seale...

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Abstract

The invention discloses a plugging agent capable of enhancing the plugging performance of a drilling fluid, and a plugging method and application thereof, and the method comprises the following steps:step 1) selecting two different types of plugging agents according to the fracture condition of a drilling stratum, wherein one plugging agent is inert particles, and the other plugging agent is a deformable polymer; step 2) adding two different types of plugging agents into the drilling fluid, wherein the addition amount of the inert particles is 2.0%-4.0% of the drilling fluid and the additionamount of the deformable polymer is 1.0%-3.0% of the drilling fluid; and step 3) pumping the drilling fluid with the two different types of plugging agents into a drilling well, enabling inert particles in the drilling fluid to quickly enter a stratum crack bridge to form an inner plugging layer, and performing micro-crosslinking deformable plugging by the deformable polymer on the basis of the inner plugging layer formed by the inert particles to form an outer plugging layer.

Description

technical field [0001] The invention belongs to the technical field of enhancing the performance of drilling fluid, and in particular relates to a plugging agent capable of enhancing the plugging performance of drilling fluid and its plugging method and application, which can be applied to water-based drilling fluid or oil-based drilling fluid. It is suitable for drilling operations in shale gas horizontal wells, shale oil horizontal wells or carbonaceous mudstone horizontal wells that have high requirements for the plugging and anti-collapse performance of drilling fluid. Background technique [0002] With the large-scale development of unconventional gas reservoirs marked by shale gas at home and abroad, the application of oil-based drilling fluids is becoming more and more extensive. Compared with traditional water-based drilling fluids, oil-based drilling fluids are widely used in shale gas drilling because of their good inhibitory, lubricating, and rheological propertie...

Claims

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Application Information

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IPC IPC(8): C09K8/46C09K8/32C09K8/24E21B33/13
CPCC09K8/46C09K8/32C09K8/24E21B33/13C09K2208/18
Inventor 王京光张小平赵海锋丁磊寄晓宁郭康王国庆赵雷王勇强张长庚贾俊吴满祥高洁刘伟赵向阳董宏伟赵建震涂海海曲先伟韩朝辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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