Oil-well cement temperature-sensitive slow-release coagulation accelerator

A technology of oil well cement and temperature sensitivity, which is applied in the field of cement slurry, which can solve the problems of increased construction period and long waiting time for setting, and achieves the effects of cost saving, low cost and stable performance

A technology of oil well cement and temperature sensitivity, which is applied in the field of cement slurry, which can solve the problems of increased construction period and long waiting time for setting, and achieves the effects of cost saving, low cost and stable performance

CN106916577AActive Publication Date: 2017-07-04SOUTHWEST PETROLEUM UNIV
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  • Oil-well cement temperature-sensitive slow-release coagulation accelerator
  • Oil-well cement temperature-sensitive slow-release coagulation accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A temperature-sensitive slow-release coagulant for oil well cement, the preparation process is as follows:

[0019] Add 5 parts by weight of stearic acid and 100 parts by weight of absolute ethanol into the conical flask, stir thoroughly, heat in a water bath at 75°C until the stearic acid is fully dissolved, then add 1.5 parts by weight of polyethylene glycol 4000, and 1.5 parts by weight of calcium chloride , stop stirring after 3 minutes, ultrasonically oscillate for 20 minutes, so that polyethylene glycol 4000 and calcium chloride are evenly dispersed in the solution, restart stirring while cooling down to below 35°C, filter, and dry at room temperature for 24 hours.

Embodiment 2

[0021] (1) Cement slurry configuration and performance test

[0022] According to the current standard for the preparation of oil well cement slurry - GB / T19139-2012 "Test Methods for Oil Well Cement", the low-density cement slurry with floating beads was prepared, and its conventional engineering performance was tested. The results are shown in Table 1.

[0023] Blank sample: 100 parts of oil well cement, 25 parts of 3M floating beads, 25 parts of micro silicon, 5 parts of fluid loss reducer (2-acrylamide-2-methylpropanesulfonic acid), 3 parts of retarder (lignosulfonic acid Sodium), mix and stir evenly to obtain the dry-mixed material; 1 part of dispersant (sodium polystyrene sulfonate), 0.2 part of defoamer (simethicone) is dissolved in 44 parts of water and stirred evenly, to obtain the wet-mixed material ; Under the stirring condition of 4000 rpm / min, the dry mix material was added to the wet mix material at a uniform speed (15s), then stirred at 12000 rpm for 35s and def...

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Abstract

The invention discloses an oil-well cement temperature-sensitive slow-release coagulation accelerator. The oil-well cement temperature-sensitive slow-release coagulation accelerator is prepared by employing an oil phase separation microcapsule technology. The method comprises the following steps: adding 3-5 weight parts of stearic acid and 100-125 weight parts of an organic solvent in a triangular flask, fully stirring the materials, heating water-bath at the temperature of 70-80 DEG C until stearic acid is fully dissolved, then adding 1-3 weight part of polyethylene glycol 4000 and 1-2 weight parts of a coagulating material, stopping stirring after 1-3 min, performing ultrasonic vibrating for 10-20 min, uniformly dispersing polyethylene glycol 4000 and the coagulating material in a solution, re-stirring the materials, and gradually cooling the material to the temperature of lower than 35 DEG C, filtering the material, and performing normal temperature drying on the material for 24 h to obtain the product. The oil-well cement temperature-sensitive slow-release coagulation accelerator has stable performance in a cement mortar, can be slowly released after reaching a preset temperature spot, has good slow releasing effect, the coagulation accelerator can obviously shorten the curing time of deep well and extradeep well after release, effectively solve the super-retarding problem of the deep well and the extradeep well, the preparation method is simple, the raw materials are common, the cost is low, the accelerator is easily popularized, and has wide market prospect.

Description

technical field [0001] The invention belongs to the field of well cementing cement slurry in exploration and development of oil and gas fields, and in particular relates to a novel temperature-sensitive slow-release coagulant. Background technique [0002] With the development of oilfield exploration and development in the direction of deep wells, ultra-deep wells and complex wells, the temperature and pressure at the bottom of the well continue to rise, resulting in a long one-time upward sealing section and a large temperature difference between the top and bottom of the sealing section. Special requirements for well cement slurry to prevent rapid thickening and condensation of cement slurry during pumping in deep well and ultra-deep well cementing operations to ensure safe and smooth construction. It is necessary to add a large amount of retarder to the cement slurry to improve high temperature The thickening performance and rheological properties of cement slurry under h...

Claims

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Application Information

Patent Timeline
04 Jul 2017
Publication
CN106916577A
IPC
C09K8/467; C04B24/26
CPC
C04B40/0039; C04B2103/10; C09K8/467; C04B24/085; C04B24/02; C04B24/26; C04B22/124
Inventors
张兴国; 于学伟