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Selective sealing and channeling method of fire flooding production wells in water flooded reservoirs

A production well and selective technology, which is applied in earthwork drilling, sealing/isolation, wellbore/well components, etc., can solve the problems that cannot meet the actual needs of oilfields, etc., so as to improve the swept volume of fire flooding, strong pertinence, Effective use of waste

Active Publication Date: 2020-10-09
PETROCHINA CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

There are some channel sealing methods mainly aimed at acid gas (for example: CN201510411805.X discloses a slaked lime sealing method in the process of burning oil reservoirs, etc.), but they cannot meet the actual needs of the oilfield site

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0026] A well in Liaohe Oilfield has a treatment section of 998.3-1032.9 meters, 16.2 meters per 10 layers, with an average effective porosity of 32%. Before construction, the daily fluid production was 27 cubic meters and the daily oil production was 1 ton. Use the papermaking black liquor (total solids mass concentration at 8%) after pulp separation in the paper mill, pass it through a 200-mesh sieve, and put it in a tank for subsequent use. Dilute the processed papermaking black liquor 10 times on site, then add 1% sodium oxalate by weight, use a pump truck, control the injection speed to 15 cubic meters per hour, and squeeze it into the formation. Stop construction. Then use 500 square meters to form a weak gel with a viscosity of about 2000mPa.s, perform water-controlled sealing, replace the annulus of the hot sewage oil jacket with the same amount, and then shut down the well for three days. In the early stage after the well was opened, the daily liquid production was 2...

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Abstract

The invention provides a selective sealing method of a water logging oil reservoir fire flooding production well. Selective sealing is conducted on the water logging oil reservoir fire flooding production well by means of papermaking black liquid, and the method specifically includes the steps of adjusting the total solid content of the papermaking black liquid to be 0.8-2%, adding 1-2 wt% of sodium oxalate to be injected into a stratum, and stopping construction when the stable squeezing pressure is increased by 2-5 MPa or the maximum pressure reaches 8-10 MPa. Papermaking black liquid wasteis used, safety and environment protection are achieved, water control and sealing are equally important, the targeted property is high, and an effective sealing effect can be achieved in the stratum;harmful oxygen and acidic gases in the stratum can be effectively reduced, the fire flooding swept volume can be increased, and the existing pipe column construction operation is simple.

Description

technical field [0001] The invention relates to a method for selectively sealing channeling of fire-flooding production wells in water-flooded oil reservoirs, in particular to a method for selectively sealing channeling of fire-flooding production wells in water-flooded oil reservoirs, and belongs to the field of oil production. Background technique [0002] Incineration oil formation technology, also known as fire flooding, is a recovery technology that can greatly increase the recovery of heavy oil reservoirs. Fire flooding is to use the heavy components in the formation crude oil as fuel, and use air or oxygen-enriched gas as a combustion aid , using methods such as spontaneous combustion and artificial ignition to make the temperature of the oil layer reach the ignition point of crude oil, and continuously inject a combustion accelerant to make the crude oil in the oil layer continue to burn. The oil is cracked at high temperature, the injected gas, the light oil produce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12E21B43/243
CPCE21B33/12E21B43/243
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朱宇宸
Owner PETROCHINA CO LTD
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