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Oil-absorbing cement slurry for well cementing and preparation method thereof

A cement slurry and cementing technology, which is applied in the field of oil and gas exploration and development, can solve problems such as singleness and cannot effectively deal with pollution, and achieve huge development and application prospects, good thickening compatibility, and improve the effect of cementing quality.

Active Publication Date: 2019-12-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars added an emulsion particle structure with oil-water amphiphilic properties to the cement slurry (Liu Wei, Zeng Min, Ma Kaihua, etc., Research and Performance Evaluation of LQ Emulsion Oleophilic Cement Slurry [J]. Petroleum Drilling Technology, 2017, 45(1): 39-44), alleviated the contact pollution of oily components and cement slurry, but also affected the hydration process of cement to a certain extent; Chinese invention patent "a cement additive for solidifying organic waste and its application" (ZL201510787457.6) Select super-hydrophobic and super-oleophilic powdery or granular oil-absorbing materials as a relatively simple type of oil-absorbing materials, which have good effects on the treatment of organic matter in the loose sediment of lakes and rivers, but cannot effectively deal with oil-based, Contamination of various complex components in simulated oil-based drilling fluid

Method used

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  • Oil-absorbing cement slurry for well cementing and preparation method thereof
  • Oil-absorbing cement slurry for well cementing and preparation method thereof
  • Oil-absorbing cement slurry for well cementing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 4 parts of adsorbent A, 20 parts of indoor self-made adsorbent C, 3 parts of fluid loss reducer, 0.3 part of dispersant, dissolve in 45 parts of fresh water, prepare an aqueous solution, put the aqueous solution under the agitator, and the agitator starts at a low speed (3000±200r / min) rotation, and add 100 parts of cement within 15 seconds, then continue stirring at high speed (12000±500r / min) for 35 seconds, turn on low speed (2000±200r / min), and add 0.2 part of defoamer, and continue to stir for 15 seconds to obtain cementing oil-absorbing cement slurry.

Embodiment 2

[0031] Weigh 3 parts of adsorbent A, 2 parts of adsorbent B, 15 parts of indoor self-made adsorbent C, 4 parts of fluid loss reducer, 0.3 part of retarder, 0.5 part of dispersant, dissolve in 50 parts of fresh water, and prepare an aqueous solution. Put the aqueous solution under the agitator, and the agitator rotates at a low speed (3000±200r / min), and adds 100 parts of cement and 15 parts of weighting agent within 15 seconds, and then continues stirring at a high speed (12000±500r / min) For 35 seconds, turn on at a low speed (2000±200r / min), add 0.2 parts of defoamer, and continue stirring for 15 seconds to obtain cementing oil-absorbing cement slurry.

Embodiment 3

[0033] Weigh 1 part of adsorbent A, 4 parts of adsorbent B, 30 parts of indoor self-made adsorbent C, 5 parts of fluid loss reducer, 0.5 part of retarder, 0.5 part of dispersant, dissolve in 53 parts of fresh water, and prepare an aqueous solution. Put the aqueous solution under the agitator, and the agitator rotates at a low speed (3000±200r / min), and adds 100 parts of cement and 20 parts of weighting agent within 15 seconds, and then continues stirring at a high speed (12000±500r / min) For 35 seconds, turn on at a low speed (2000±200r / min), add 0.2 parts of defoamer, and continue stirring for 15 seconds to obtain cementing oil-absorbing cement slurry.

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Abstract

The invention relates to cementing oil adsorption cement paste and a preparation method thereof. The cementing oil adsorption cement paste comprises the following components in parts by weight: 100 parts of cement, 45-58 parts of fresh water, 0-30 parts of a weighting agent, 3-10 parts of an adsorbent A, 0-5 parts of an adsorbent B, 10-30 parts of an adsorbent C, 3-6 parts of a fluid loss agent, 0-0.8 part of a retarder, 0-0.6 part of a dispersant and 0-0.2 part of a defoamer, wherein the adsorbent A is silica fume; the adsorbent B is PVC resin; and the adsorbent C is prepared by the followingsteps: crushing talcum mine, grinding the crushed talcum mine into uniform powder, performing ultra-fine grinding, placing the finely ground talcum mine in a muffle furnace, performing heating at a nitrogen atmosphere to 700 DEG C, performing constant-temperature roasting for 5 h, preparing hydrochloric acid with the concentration of 15%, adding the powder, performing uniform stirring for 4 h, and performing sedimentation, filtration, washing and drying. Not only is the reverse wetting function of a flushing spacer fluid coordinated, but also the cementing quality of a cement-formation interface and the sealing capability after slurry mixing pollution are remarkably improved, the cost is low, the process is controllable, and a wide market prospect is achieved.

Description

technical field [0001] The invention relates to an oil-absorbing cement slurry for well cementing under the condition of oil-based or imitated oil-based drilling fluid in the drilling process in the field of petroleum and natural gas exploration and development and a preparation method thereof. Background technique [0002] As the reserves of recoverable conventional oil and gas resources on land are approaching the end of development, the proportion of unconventional oil and gas exploration and development such as shale gas and ultra-deep wells is gradually increasing. Facing the special and harsh surrounding rock geological conditions of unconventional oil and gas reservoirs Oil-based and imitation oil-based drilling fluids are recognized for their excellent properties such as high inhibition, high stability, and reduced friction, which can effectively maintain the long-term stability of the surrounding rock of the well wall and reduce the risk of oil and gas well drilling,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/467C04B18/14C04B14/04C04B16/04
CPCY02W30/91
Inventor 李早元祁凌郭小阳张兴国程小伟李明刘健
Owner SOUTHWEST PETROLEUM UNIV
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