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High-density spherical particle composite weighting agent for well drilling or well cementation as well as preparation method of high-density spherical particle composite weighting agent

A technology of spherical particles and weighting agents, applied in wellbore/well components, drilling compositions, chemical instruments and methods, etc., can solve the problems of poor rheology of drilling fluid and increased drilling difficulty, and achieve acid tolerance Good, good fluidity, low bleeding effect

Inactive Publication Date: 2020-09-11
重庆钜泾化工科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Conventional drilling fluids are limited in solving these problems, especially rheological problems
The usual treatment method is to use a water-insoluble inert weighting agent, which can make the density of the drilling fluid meet the requirements (2.0-2.5g / cm 3 Density requirements), but at the same time, the solid phase content of the drilling fluid is too high, and the plastic viscosity (PV) is significantly increased. If the soil content is slightly increased, its dynamic and static shear forces (YP, G) will be greatly increased. Poor rheological properties of drilling fluid and increased drilling difficulty

Method used

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  • High-density spherical particle composite weighting agent for well drilling or well cementation as well as preparation method of high-density spherical particle composite weighting agent
  • High-density spherical particle composite weighting agent for well drilling or well cementation as well as preparation method of high-density spherical particle composite weighting agent
  • High-density spherical particle composite weighting agent for well drilling or well cementation as well as preparation method of high-density spherical particle composite weighting agent

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments.

[0024] Prepare spherical particle composite weighting agent according to the process as follows:

[0025] 1) Selection of raw materials: low-carbon steel alloys are used as raw materials, and the composition of raw materials is analyzed and determined;

[0026] 2) Raw material selection and impurity removal: use magnetic separation method and sedimentation static method to remove dust, sand and impurities;

[0027] 3) Oxidation-reduction impurity removal: oxidation-reduction at 700-900°C removes various harmful impurities, removes oil stains or other volatile and decomposed organic minerals in raw materials at high temperature, and oxidizes and removes sulfur, phosphorus, silicon, and magnesium in raw materials and other impurities, liquid ammonia removes excess oxygen and carbon in the raw materials; after the above three steps, further detection and analysis of the mater...

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Abstract

The invention discloses a high-density spherical particle composite weighting agent for well drilling or well cementation. The weighting agent has a density of 7.0-7.5 g / cm<3> and a particle size of 80-425 meshes. The invention further discloses a preparation method of the composite weighting agent. By use of the preparation method, large specific gravity and controllable particle size of the weighting agent can be realized, besides, the weighting agent has better particle morphology similar to a zero-dimensional spherical structure, and the weighting agent has good fluidity and good acid solubility and can be recycled after being added to a well drilling fluid; and the weighting agent has good dispersion and suspension stability performance and has the effect of low bleeding rate after being applied to a well cementing fluid.

Description

technical field [0001] The invention relates to a weighting agent used in drilling fluid in the field of oil drilling, in particular to a high-density spherical particle composite weighting agent for oil and natural gas drilling or well cementing and a preparation method thereof. Background technique [0002] With the development of oil and gas exploration to deep and complex formations, oil and gas are buried deeper and deeper, formation pressure coefficients are getting higher and higher, more ultra-high pressure gas layers and brine layers are encountered, and the application range of high-density drilling fluids is increasing. wide. [0003] In order to meet the needs of deep wells, ultra-deep wells, high-pressure wells, and complex well drilling and cementing projects, it is required that the drilling and cementing fluids have appropriate density, good rheology, good filtration loss and wall building performance, and strong inhibition. At present, the density of high-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B33/13C09K8/03C09K8/50
CPCC09K8/032C09K8/50E21B21/00E21B33/13
Inventor 刘朝辉刘硕琼靳建洲于永金刘志成杨宏波齐奉忠刘慧婷刘子帅张弛张华徐明夏修建
Owner 重庆钜泾化工科技有限公司
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