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Oil gas productive layer plugging-type oil well cement being acidifyingly soluble

An oil well cement and leakage type technology, applied in the field of oil well cement, can solve the problems of high strength, inability to acidify and dissolve, and no volume shrinkage, etc., and achieve the effect of solving serious pollution and facilitating development and production increase.

Inactive Publication Date: 2015-12-09
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102719232A discloses a plugging agent for shallow casing leaky wells, which is suitable for plugging shallow casing leaky wells in oil fields. It contains 10-15% of light calcium carbonate, and the plugging agent slurry has high strength and small volume after solidification. Shrinkage, no micro-cracks, but unable to fully acidify and dissolve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of plugging type oil well cement for oil and gas production layers, the raw materials are weighed according to the following weight ratio, mixed evenly, put into a water bath curing box at 80°C for 48 hours under normal pressure, and the cement stone of 50.8cm×50.8cm×50.8cm is obtained, which is used Acidify the cement stone with conventional acid solution for 12 hours, and measure the change rate of cement stone quality before and after acidification to evaluate the solubility of cement.

[0016] Jiahua G grade oil well cement 100 parts

[0017] 80 parts of superfine calcium carbonate

[0018] 15 parts of silicon powder

[0019] Micro silicon 2 parts

[0020] Attapulgite (Jiangsu Xuyi) 1 part

[0021] DS-10S (Sichuan European and American Branch) 1 copy

[0022] G33S (Henan Weihui). 5 copies.

Embodiment 2

[0024] A kind of plugging type oil well cement for oil and gas production layers, the raw materials are weighed according to the following weight ratio, mixed evenly, put into a water bath curing box at 80°C for 48 hours under normal pressure, and the cement stone of 50.8cm×50.8cm×50.8cm is obtained, which is used Acidify the cement stone with conventional acid solution for 12 hours, and measure the change rate of cement stone quality before and after acidification to evaluate the solubility of cement.

[0025] Jiahua G grade oil well cement 100 parts

[0026] 100 parts of superfine calcium carbonate

[0027] 20 parts of silicon powder

[0028] Micro silicon 2 parts

[0029] Attapulgite (Jiangsu Xuyi) 1 part

[0030] DS-10S (Sichuan European and American Branch) 1 copy

[0031] G33S (Henan Weihui) 0.5 parts.

Embodiment 3

[0033] A kind of plugging type oil well cement for oil and gas production layers, the raw materials are weighed according to the following weight ratio, mixed evenly, put into a high-temperature pressurized curing kettle for curing for 48 hours at 130°C and 50MPa, and the cement stone of 50.8cm×50.8cm×50.8cm is obtained , use conventional acid solution to acidify cement stone for 12h, measure the change rate of cement stone quality before and after acidification, so as to evaluate the solubility of cement.

[0034] Jiahua G grade oil well cement 100 parts

[0035] Calcium carbonate 130 parts

[0036] 30 parts of silicon powder

[0037] Micro silicon 2 parts

[0038] Attapulgite (Jiangsu Xuyi) 0.5 parts

[0039] DS-10S (Sichuan European and American Branch) 1 copy

[0040] G33S (Henan Weihui) 0.5 parts.

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Abstract

The invention discloses oil gas productive layer plugging-type oil well cement being acidifyingly soluble and belongs to the field of oil well cement of well cementation of petroleum and natural gas. The oil well cement comprises following components, by weight, 100 parts of oil well cement, 50-200 parts of carbonates, 15-30 parts of silicon powder, 2-10 parts of micro silicon, 0-5 parts of a flow-type regulation agent, 0-5 parts of a fluid loss agent and 0-5 parts of a retarder. When the cement slurry is injected into an oil gas leakage zone, static gelatinization strength is quickly generated in the cement slurry, and then the cement slurry is thickened and condensed to form low-strength cement stone for plugging gaps and throat channels in the oil gas bed, thereby achieving plugging in a well. After well completion, through acidification operation, the carbonates in the cement in the pores and gaps in the strata is acidified and dissolved, thereby penetrating an oil gas channel in a productive layer and further recovering oil gas productivity. The oil well cement solves the problem that common oil well cement causes serious pollution to the productive layer, and has a significant effect of recovering the oil gas productivity for an oil gas channel which is plugged by cement, and is beneficial to development and production increase of an oil gas well in later period.

Description

technical field [0001] The invention relates to oil well cement, in particular to an oil well cement capable of acidifying and dissolving oil and gas production layer plugging. Background technique [0002] For low-pressure oil and gas reservoirs, due to low formation pressure and developed pores, serious leakage often occurs in oil and gas reservoirs during drilling. When the plugging effects of mud while drilling, mica, fruit shells and cross-linked materials are not obvious, usually Cementing is used for sealing and plugging. Various plugging materials that leak into the formation will cause serious pollution to the production layer. Although the cement that enters the pore throat of the oil and gas production layer has been successful in plugging, the drilling operation can continue, but it will solidify. Because of its insoluble properties, high-grade cement causes large-area, long-distance permanent sealing and plugging of oil and gas production layers. Even acid fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C04B28/02
CPCC09K8/487C04B28/02C04B2111/00724C09K8/426C04B14/28C04B14/26C04B14/062C04B14/10C04B24/287C04B24/24C04B24/383
Inventor 刘振通高飞宋志强党冬红吴永超莫仁建尹璇汤正辉陈光程海林
Owner CNPC BOHAI DRILLING ENG
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