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Nanometer blocking agent for oil-based drilling fluid and preparation method of nanometer blocking agent

A nano-plugging agent and oil-based drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of easy collapse of the well wall of shale gas wells, and achieve the reduction of API filtration loss and operation. The process is simple and the effect of solving the collapse of the well wall

Active Publication Date: 2014-12-10
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

[0006] In order to solve the above problems, the object of the present invention is to provide a nano-blocking agent for oil-based drilling fluid, which can effectively block nano-scale micro-fractures and solve the problem that the well wall of shale gas wells is easy to collapse. question

Method used

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  • Nanometer blocking agent for oil-based drilling fluid and preparation method of nanometer blocking agent
  • Nanometer blocking agent for oil-based drilling fluid and preparation method of nanometer blocking agent
  • Nanometer blocking agent for oil-based drilling fluid and preparation method of nanometer blocking agent

Examples

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Embodiment 1

[0028] This embodiment provides a nano-plugging agent for oil-based drilling fluid, the nano-plugging agent includes: 40 g of styrene, 20 g of methyl methacrylate, 0.6 g of emulsifier sodium lauryl sulfate, deionized 140 g of water, 1.8 g of N,N'-methylenebisacrylamide, 0.069 g of sodium bisulfite, and 0.06 g of potassium persulfate.

[0029] The preparation method of the above-mentioned nanometer plugging agent for oil-based drilling fluid specifically comprises the following steps:

[0030] Step 1: Mix the emulsifier, N,N'-methylenebisacrylamide and deionized water, and stir evenly to obtain a mixture;

[0031] Step 2: add styrene and methyl methacrylate to the mixture, and emulsify for 20-30min at a stirring speed of 3000r / min to obtain a pre-emulsion;

[0032] Step 3: Add sodium bisulfite and potassium persulfate to the reaction kettle containing 20wt% pre-emulsion, heat up to 60°C and react for 20-30min, drop the remaining pre-emulsion, and react at 60°C for 3h to obtain...

Embodiment 2

[0035] This embodiment provides a nanometer plugging agent for oil-based drilling fluid, the nanometer plugging agent includes: 30 g of styrene, 30 g of methyl methacrylate, 0.6 g of sodium lauryl sulfate, and 140 g of deionized water , N,N'-methylenebisacrylamide 1.8g, sodium bisulfite 0.069g and potassium persulfate 0.06g.

[0036] The preparation method of the above-mentioned nanometer plugging agent for oil-based drilling fluid specifically comprises the following steps:

[0037] Step 1: with embodiment 1;

[0038] Step 2: the same as in Example 1, the difference is that the stirring rate is 4000r / min;

[0039] Step 3: Similar to Example 1, except that after dripping the remaining pre-emulsion, react at 70° C. for 4 hours to obtain a nano-plugging agent for oil-based drilling fluid with an average particle size of 80 nm.

Embodiment 3

[0041] This embodiment provides a nano-plugging agent for oil-based drilling fluid, the nano-plugging agent includes: 20 g of styrene, 40 g of methyl methacrylate, 0.6 g of sodium lauryl sulfate, and 140 g of deionized water , N,N'-methylenebisacrylamide 1.8g, sodium bisulfite 0.069g and potassium persulfate 0.06g.

[0042] The preparation method of the above-mentioned nanometer plugging agent for oil-based drilling fluid specifically comprises the following steps:

[0043] Step 1: with embodiment 1;

[0044] Step 2: the same as in Example 1, the difference is that the stirring rate is 5000r / min;

[0045] Step 3: Similar to Example 1, except that after dripping the remaining pre-emulsion, react at 80° C. for 5 hours to obtain a nano-plugging agent for oil-based drilling fluid with an average particle size of 60 nm.

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Abstract

The invention provides a nanometer blocking agent for an oil-based drilling fluid and a preparation method of the nanometer blocking agent. The nanometer blocking agent comprises the following components in parts by weight: 10-40 parts of styrene, 20-60 parts of methyl methacrylate, 0.3-1.0 part of emulsifier, 130-150 parts of deionized water, 1.0-2.0 parts of cross-linking agent and 0.1-0.2 part of redox initiator. The preparation method of the nanometer blocking agent comprises the following steps of mixing the emulsifier, the cross-linking agent and deionized water and evenly stirring to obtain a mixture; adding styrene and methyl methacrylate into the mixture and emulsifying for 20-30 minutes to obtain a pre-emulsion; adding the redox initiator into the 20-35wt% pre-emulsion, raising the temperature to 60-80 DEG C, reacting for 20-30 minutes, dropwise adding the residual pre-emulsion and continuously reacting at 60-80 DEG C for 2-5 hours to obtain the nanometer blocking agent for the oil-based drilling fluid. Due to adoption of the nanometer blocking agent for the oil-based drilling fluid disclosed by the invention, the nanoscale microcrack can be effectively blocked and the problem that the well wall of a shale gas well easily collapses is solved and the nanometer blocking agent is simple in preparation method.

Description

technical field [0001] The invention relates to a plugging agent and a preparation method thereof, in particular to a nanometer plugging agent for oil-based drilling fluids and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] Since the 20th century, China has started the exploration and development of shale gas, and dozens of shale gas wells have been drilled for decades. However, shale gas wells generally have the problem of easy sidewall collapse. In order to prevent the wellbore collapse of shale gas horizontal wells, oil-based drilling fluids are generally used, but the use of oil-based or synthetic-based drilling fluids does not solve wellbore collapse well The problem. [0003] The main cause of borehole collapse in shale gas wells is borehole instability. For oil-based drilling fluids with strong inhibitory ability, the main cause of shale borehole instability is the infiltration of drilling fluid...

Claims

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Application Information

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IPC IPC(8): C09K8/46C08F220/14C08F212/08C08F4/40
CPCC08F212/08C08F220/14C09K8/34C09K8/512C09K2208/10C08F222/385C08F4/40
Inventor 王建华李建男闫丽丽王立辉张延丽李爽杨海军冯杰郑建龙王发云季一辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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