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Low-temperature solidified sand and preparation method thereof

A technology of consolidating sand and low temperature, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problems of oil (gas) well project scrapping, difficult repair, casing staggered breaking and collapsing, etc., to improve the reaction Speed ​​and consolidation strength, increase product shelf life, and avoid the effect of flowback throughput

Pending Publication Date: 2020-06-26
北京昆仑隆源石油开采技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is time-consuming and labor-intensive to flush the buried formation and remove the sand blockage of the oil pipe. The problem has not been completely solved. Soon after the production resumes, it needs to be repeated again and again. The sand production is more serious and the production cycle is getting shorter and shorter. Lying in the well will greatly reduce the output, increase the operation cost and cause serious economic losses
Second, surface and downhole equipment intensifies abrasion: formation sand particles carried in oil and gas flow are mainly composed of SiO 2 , the main component has high hardness and high flow rate, which can easily cause downhole pump valve pitting, tubing puncture, plunger damage, sand sticking, and ground valve failure, so that the well is often forced to shut down operations, replace or maintain equipment, and reduce production ,increase cost
Third, the casing is damaged and the oil well is scrapped: in the long-term serious sand production, a huge cavity will be formed outside the casing, and the unbalanced internal and external forces will cause the formation to suddenly collapse, causing deformation of the casing in the slightest, and casing in severe cases. The pipe was broken and collapsed, and it was very difficult to repair, which made the oil (gas) well project scrapped and suffered heavy losses
[0003] In addition, the existing curable sand control materials have a relatively high curing temperature (200°C to 300°C), and the corresponding curing time is relatively long, which will cause a decline in function during the sand control process and increase the possibility of sand flowback

Method used

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  • Low-temperature solidified sand and preparation method thereof

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preparation example Construction

[0021] like figure 1 As shown, the first aspect of the present invention provides a method for preparing low-temperature consolidated sand, comprising: heating a certain amount of aggregate to 160°C to 230°C, and combining the aggregate with a certain amount of first bonding After that, add a certain amount of the first curing agent and mix for 5s to 15s, then add a certain amount of the second binder and stir for 1s to 5s; after that, add a certain amount of microcapsules and stir for 8s ~12s; after that, add a certain amount of dispersant and stir, crush and sieve to obtain low-temperature consolidated sand. Specifically, the mass ratio of aggregate, first binder, first curing agent, second binder, microcapsules and dispersant in the above preparation process is 800-1200:10-50:1-8:15 ~30:3~6:0.5~1.5.

[0022] It should be noted that the low-temperature consolidated sand obtained in the present invention is loose particles, which are injected underground, and the microcapsu...

Embodiment 1

[0025] like figure 1 As mentioned above, this embodiment provides a method for preparing low-temperature consolidated sand, which specifically includes the following steps:

[0026] First, weigh each material used in the preparation process according to the following mass ratio, specifically, the mass of aggregate, first binder, first curing agent, second binder, microcapsules and dispersant The ratio is 1000:10-50:1-8:15-30:3-6:1.

[0027] Add corresponding mass of aggregate according to the above mass ratio and heat to 160°C-230°C, mix the aggregate and corresponding mass of the first binder and stir for 10s-20s.

[0028] It should be noted that the aggregate in this embodiment can be quartz sand, ceramsite, etc., and the first binder can be bisphenol A epoxy resin. The same type of epoxy resin can be used according to their viscosity and epoxy value. Different, its performance and use will be different, therefore, this embodiment selects the epoxy value range of bisphenol...

Embodiment 2

[0041] In this example, the properties of the low-temperature consolidated sand prepared in Example 1 above are tested. The specific detection method is: add water and stir the low-temperature consolidated sand particles in Example 1, put them in a mold to prepare a sample block, then put it in a water bath for 24 hours to demould, and then measure its compressive strength and permeability. Specifically, the results show that the low-temperature consolidated sand sample block obtained by the present invention has a breakage rate of 1.15% against 52 MPa, an unconfined compressive strength of 15.1 MPa, and a sample block permeability of 156 μm 2 . From the above test results, it can be seen that the low-temperature consolidated sand provided by the present invention has fast curing speed, high strength, and short curing time, which can improve the production efficiency of oil wells, and has good permeability, and has little impact on the productivity of oil wells after sand cont...

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Abstract

The invention provides low-temperature solidified sand and a preparation method thereof, and belongs to the technical field of oil field oil-water well sand control materials. The preparation method of the low-temperature solidified sand comprises the following steps: heating a certain amount of aggregate to 160-230 DEG C, mixing the aggregate with a certain amount of a first binder, and stirringfor 10-20 seconds; adding a certain amount of a first curing agent, and mixing for 5-15 seconds; adding a certain amount of a second binder, and stirring for 1-5 seconds; adding a certain amount of microcapsules and stirring for 8-12 seconds; and adding a certain amount of a dispersing agent, stirring, crushing and screening to obtain the low-temperature solidified sand. According to the invention, a microcapsule encapsulating curing agent technology is utilized, the surface of the aggregate is coated with the second curing agent, the microcapsules can isolate the second binder from the secondcuring agent, the microcapsules are broken by pressure, and when the wall breaking pressure is reached, the walls of the microcapsules are broken to release the second curing agent, so that the second curing agent and the second binder are subjected to consolidation reaction underground to form a continuous cemented solidified body with a three-dimensional net shape, and sand prevention and flowback prevention can be realized.

Description

technical field [0001] The invention belongs to the technical field of sand control materials for oil and water wells in oil fields, and in particular relates to a low-temperature consolidated sand and a preparation method of the low-temperature consolidated sand. Background technique [0002] The sand production of oil wells in unconsolidated sandstone oil layers is serious during oil production, which will quickly block oil passages or even block oil wells, resulting in reduced or shut down production of oil wells. Sand production in oil (steam) wells is an important problem faced by unconsolidated sandstone oil (gas) reservoirs one. The harm of sand production is mainly manifested in the following three aspects: First, the production reduction or shutdown of oil wells: sand production in oil (gas) wells can easily cause sand to bury production layers, sand plugging in oil pipes, and sand accumulation in ground manifolds and storage shortages, which are Forced to stop pro...

Claims

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Application Information

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IPC IPC(8): C09K8/575C04B26/14
CPCC09K8/5756C04B26/14C04B2111/00724C04B2201/50C04B24/302C04B18/023C04B14/06C04B24/2676C04B24/128C04B2103/408
Inventor 任龙强王光王建兵马欢
Owner 北京昆仑隆源石油开采技术有限公司
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