High-temperature-resistant plugging agent for heavy oil horizontal well and water plugging method

A high-temperature-resistant, horizontal well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as complicated construction procedures, inability to implement small cased wells, short curing or gelling time, etc. To achieve the effect of guaranteeing water blocking effect, good water blocking effect and reducing the risk of measures

Active Publication Date: 2021-05-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high temperature resistant plugging agent currently used is generally a resin fly ash plugging agent or a double-excited inorganic gel plugging agent. The curing or gelation time is relatively short, and subsequent drilling and grinding is required to deal with the residual plugging agent in the wellbore. The construction process is complicated and the casing is damaged. This measure cannot be implemented for wells or small cased wells after overhaul

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a water plugging method for a heavy oil horizontal well, which specifically includes:

[0025] For Du 32-Xing H357 well in an oilfield (the density of crude oil at 20°C is 1.01g / cm 3 , The viscosity of ground degassed crude oil at 50°C is 96210mPa.s, the freezing point is 23°C, the wax content is 4.9%, and the colloid + asphaltene content is 49.04%. According to the heavy oil classification standard, this block belongs to super heavy oil) water plugging construction, first use the water plugging pipe to inject 1,200 m3 of foam gel plugging agent and 60,000 m3 of nitrogen into the oil layer at a construction pressure of 17 MPa; then according to the treatment of 0.6 m Radius design injection volume, with a construction pressure of 13MPa, inject 100 cubic meters of high temperature resistant plugging agent.

[0026] Taking the foam gel plugging agent as 100%, the specific composition of the above foam gel plugging agent is: 0.8% of partially hydr...

Embodiment 2

[0030] This embodiment provides a water plugging method for a heavy oil horizontal well, which specifically includes:

[0031] For Du 813-Xingping 2 well in an oilfield (the density of crude oil at 20°C is 1.0098g / cm 3 , The viscosity of ground degassed crude oil at 50°C is 108880mPa.s, the freezing point is 26.1°C, the wax content is 2.3%, and the colloid + asphaltene content is 51%. According to the heavy oil classification standard, this block belongs to super heavy oil) water plugging construction, first use the water plugging pipe to inject 1,500 cubic meters of foam gel plugging agent and 90,000 standard cubic meters of nitrogen into the oil layer at a construction pressure of 18 MPa; then according to the treatment of 0.76m Radius design injection volume, with a construction pressure of 14MPa, inject 150 cubic meters of high temperature resistant plugging agent.

[0032] Based on the total weight of the foam gel plugging agent as 100%, the specific composition of the a...

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Abstract

The invention provides a high-temperature-resistant plugging agent for a heavy oil horizontal well and a water plugging method. The high-temperature-resistant plugging agent comprises water glass, urea and a filling agent, the volume ratio of the water glass to the urea is 1: (2-2.2), and the filling agent accounts for 20-25% of the total weight of the water glass and the urea. The residual plugging agent of the high-temperature-resistant plugging agent in a shaft can be treated through flushing operation, so that the construction safety is effectively ensured, and the construction process is simplified. The invention further provides a heavy oil horizontal well water plugging method, according to the method, the high-temperature-resistant plugging agent serves as a near-well section plug, a nitrogen foam gel plugging agent serves as a far-well section plug, and the water plugging effect of the horizontal well is guaranteed through cooperation of the two plugging agents. Compared with other water plugging methods of the high-temperature-resistant plugging agent, the high-temperature-resistant plugging agent and the water plugging method have the advantages of being wide in material source, safe and simple in construction, good in water plugging effect and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a high-temperature-resistant plugging agent and a water plugging method for heavy oil horizontal wells. Background technique [0002] Horizontal wells are mainly used for inter-well infilling of heavy oil and secondary evaluation of low-grade reserves in old areas, layered development, and secondary development. They have the characteristics of complex geological conditions, various types of reservoirs, and wide application types. However, with the increase of production rate and the decline of formation pressure, the problem of edge-bottom water invasion gradually intensifies, and the phenomenon of high water content in the produced fluid or even water flooding is common, and the water flooding problem gradually spreads to adjacent wells in the same layer, causing Water from vertical or horizontal well areas. After the water breakthrough in the horizontal well, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/467C09K8/44E21B33/138
CPCC09K8/46C09K8/467C09K8/44E21B33/138
Inventor 刘江玲黄腾门琦淏黄小雷李尚莹
Owner PETROCHINA CO LTD
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