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Mosaic shielding drilling fluid

A technology of embedding shielding agent and drilling fluid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficulty in accurately obtaining pore size data of construction wells, unsatisfactory shielding temporary blocking effect, and increased production costs. , to achieve the effect of inhibiting hydration and dispersion, good oil layer protection, and preventing collapse.

Active Publication Date: 2015-03-18
东营市大用石油助剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of reservoir rock heterogeneity, it is often difficult to accurately obtain the pore size data of construction wells, which often leads to unsatisfactory shielding and temporary plugging effects, and sometimes even increases the damage to oil and gas layers, and shielding temporary plugging After that, follow-up plugging removal operations are often required, which increases production costs. The mechanism of drilling fluid action in the prior art can be found in figure 1

Method used

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  • Mosaic shielding drilling fluid
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0199] Example 1 Preparation of mosaic shielding agent

[0200] Add 100g of quartz sand with a particle size of 40-50μm, 2000g of acrylamide monomer, 260g of benzoyl peroxide and 200g of sodium lauryl sulfate into water, raise the temperature to 60°C, react for 3 hours, and dry to obtain a mosaic shield Agent A.

Embodiment 2

[0201] Example 2 Preparation of mosaic shielding agent

[0202] The mosaic shielding agent B was prepared in the same manner as in Example 1, except that 100 g of quartz sand with a particle size of 100 μm was used.

Embodiment 3

[0203] Example 3 Preparation of mosaic shielding agent

[0204] Add 100 g of quartz sand with a particle size of 200-250 μm, 1200 g of acrylamide monomer, 150 g of tert-butyl peroxyvaleric acid and 100 g of triethylhexyl phosphoric acid into water, raise the temperature to 70 ° C, and form a long chain after the reaction is completed The polymer was dried to obtain the mosaic shielding agent C.

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PUM

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Abstract

The invention relates to mosaic shielding drilling fluid, which comprises the following components by weight content: 0.2-8.5% of mosaic shielding agent, 0-5% of adhesion agent, 0-8% of weighting agent and the balance of base liquid, the mosaic shielding agent is added in water with a monomer, an initiator, a dispersant and rigid core, the components are uniformly stirred and heated to a reaction, and then dried to obtain the drilling fluid. The drilling fluid has unidirectional plugging effect due to usage of the mosaic shielding agent, and has good adaptability for inlet apertures with different shapes due to elastic variability characteristic, and the oil well production power can not be influenced.

Description

technical field [0001] The invention relates to a mosaic shielding drilling fluid, a preparation method and a use method of the mosaic shielding drilling fluid. Background technique [0002] With the continuous growth of the world's oil and gas demand, the exploration and development of complex oil and gas reservoirs by using the protection drilling fluid technology is increasing year by year. Developing low-damage drilling and completion fluids to minimize reservoir damage during drilling is the key to achieving drilling results in complex oil and gas reservoirs. [0003] In order to effectively prevent the drilling fluid from intruding into the reservoir, there are conventional shielding temporary plugging technologies, broad-spectrum shielding temporary plugging technologies and ideal filling shielding temporary plugging technologies in the prior art. These shielding temporary plugging technologies require that the particle size of the temporary plugging agent be smaller...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C08F120/56C08F2/44C08F2/18C08K3/36C08K3/34
CPCC08F292/00C09K8/12C08F220/56
Inventor 韩阳杨小平黄禾
Owner 东营市大用石油助剂有限责任公司
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