A cooling oil-based selective water plugging method

A selective and cooling technology, applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problem of increasing the cost of water blocking agent, and achieve the effect of low cost of measures

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the heavy oil water shutoff method is composed of crude oil mixed additives, and the addition of additives will increase the cost of water shutoff agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] In a well in Liaohe Oilfield, the Xinglongtai reservoir was treated, the effective thickness of the treated well section was 1339.5-1467.8m / number of layers was 47.9 / 10, and the formation temperature was 62°C. Before the measures, the daily fluid production was 63 cubic meters, the daily oil production was 1.9 tons, and the water cut was 97%. Squeeze 164 cubic meters of self-produced heavy oil preheated at 85°C from the casing (ground degassed viscosity 3564MPa.s, temperature inflection point 72°C). Enter 45 m3 of cold water at 12°C for heat exchange in the formation. After shutting down the well for 24 hours, the well will be opened for normal production. Seven days after the measures were taken, the average daily liquid production was 40 cubic meters, the daily oil production was 6 tons, and the water content was 85%. The accumulative increase of oil is 192 tons (deducting the amount of squeezed heavy oil), and the validity period is 64 days. The effect is obvious.

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Abstract

The invention provides a cooling type oil-based selective water plugging method. The Cooling type oil-based selective water plugging method comprises the steps that heavy oil is preheated, so that thefluidity of the heavy oil is restored, and the heavy oil is injected into the formation; after squeezing injection of the heavy oil is finished, displacement is conducted with hot water, the heavy oil is totally squeezed into the formation, heat transfer at immediate vicinity of wellbore is conducted with cold water, so that the temperature of the heavy oil is reduced to the turnover temperatureor below, and plugging is formed. The viscosity of the heavy oil in a water layer can keep basically unchanged, while the viscosity and the flowback resistance of the heavy oil in an oil layer are reduced because the heavy oil in the oil layer makes contact with thin oil, and the selective aim of water plugging without oil plugging is achieved. The squeezed crude oil can be slowly produced from the formation finally, and the measure cost is low.

Description

technical field [0001] The invention relates to a cooling oil-based selective water shutoff method, in particular to a water shutoff method applied to production wells in conventional water injection development thin oil blocks, and belongs to the field of oil production. Background technique [0002] Oil well shutoff refers to the use of mechanical or chemical methods to shut off water in flooded oil wells to reduce oil well water output and increase crude oil production. [0003] Selective water shutoff agents for oil wells mainly include: a. Body-swellable polymer water shutoff agent; b. Water-soluble polymer water shutoff agent; c. Cross-linked polymer shutoff agent; d. Activated heavy oil shutoff agent ; e. Silicone blocking agent; f. Alcohol-based blocking agent, etc.; g. Oil-based cement water blocking agent. [0004] There are many options for oil base in oil-based water blocking agent. Among them, the oil-based gel plugging agent will not hinder the oil flow due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/138
CPCE21B33/138
Inventor 马春宝陆福刚于萍尉小明王凯王晨皓马子健王德伟高玉军桑雨李新
Owner PETROCHINA CO LTD
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