Composite high-temperature profile control method for heavy oil well

A high-temperature, oil well technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as difficult to achieve high-temperature profile control and channel sealing, and low steam foam plugging strength, so as to increase production and production Yield, effect of increasing swept volume

Active Publication Date: 2014-04-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to indoor and field experiments, the plugging strength of steam foam is low. When the injected steam pressure is high and the formation has large pores, it is difficult to achieve the effect of high temperature profile control and channel sealing.

Method used

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  • Composite high-temperature profile control method for heavy oil well
  • Composite high-temperature profile control method for heavy oil well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Experiments were carried out using the temperature-resistant and pressure-resistant experimental model. The model has a pressure resistance of 10MPa, a model diameter of 3.06cm, and a length of 21cm. In order to effectively test the profile control effect of plugging agents in heterogeneous formations, the experimental model is designed as a concentric heterogeneous model, the central high-permeability layer is filled with 20-40 mesh quartz sand, the diameter of the inner core cylinder is 1.70 cm, and the surrounding is filled with 120-140 mesh Mesh quartz sand. Experimental model see figure 1 , figure 2 . In the figure, 1 is a heating oven, 2 is an experimental core model, 3 is a steam generator, 4 is an injection pump, and 5 is a valve; in the experimental core model 2, 6 is a high-permeability core zone, and 7 is a low-permeability core zone. First, the solid-phase high-temperature profile control agent inorganic phenolic resin injected into the core model 2 (see...

Embodiment 2

[0032] The experiment was carried out according to the method in Example 1, wherein the solid-phase high-temperature plugging agent was changed to a double-liquid method high-temperature plugging agent, and water glass, isolation Liquid, calcium chloride 0.5PV (pore volume), then inject high-temperature steam, and at the same time inject temperature-resistant 1% sulfonate surfactant into the core to produce (1PV) the same effect is remarkable, and the recovery rate is increased by more than 10%.

Embodiment 3

[0034] It was constructed in Well Qi 40-2-24 in Liaohe Oilfield. This well is a steam huff and puff well that has been in production for more than 5 years. The steam huff and puff has eight cycles, and the steam absorption in the oil layer is seriously uneven in the vertical direction. Inject 200 cubic meters of high-temperature steam into the well, then inject 80 cubic meters of lignin gel plugging agent, and shut the well for 48 hours. Then start to inject steam, and inject 15 tons of sodium hexadecylbenzenesulfonate, a high-temperature blowing agent. After the composite high-temperature profile control measures before and after comparison, the steam injection pressure increased by 2MPa, and the steam absorption profile was significantly changed by the TPS-9000 test. Before the high-temperature profile control, layers 15, 20, and 21 were the main steam-absorbing layers, followed by No. 18 After the profile control, the steam absorption of the upper layer No. 15 was significa...

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Abstract

The invention provides a composite high-temperature profile control method for a heavy oil well. The method comprises the following steps: firstly, injecting a solid-phase high temperature profile control agent into the heavy oil well to form plugging materials for plugging primary steam absorption channels; and then simultaneously injecting steam and a high temperature foam profile control agent into the heavy oil well so as to plug secondary steam absorption channels and plug steam absorption channels in the areas far away from the well. By using the method provided by the invention, especially using the process of injecting stream to the well to exploit heavy oils, the steam injection efficiency is enhanced, and the utilization degree of the heavy oils in stratums is improved; and in case of carrying out core simulation experiment and field test according to the method provided by the invention, the purposes of effectively plugging the primary steam absorption channels and increasing the swept volume of high-temperature profile control are achieved.

Description

technical field [0001] The invention relates to a compound high-temperature profile control method for heavy oil wells, and is a method for improving production and oil recovery efficiency in crude oil exploitation, especially a method for increasing steam injection efficiency and improving formation heavy oil production degree in heavy oil exploitation by steam injection. Background technique [0002] Petroleum is an important resource and has an important strategic position in the national economy. With the gradual progress of crude oil extraction, the proportion of thin oil production will gradually decrease, and then it will turn to the production of heavy oil with higher mining costs. At present, the most important method of producing heavy oil is to inject hot steam into the oil layer to reduce the viscosity of the heavy oil in the underground and wellbore flow during production, so that the heavy oil can be successfully produced. However, after multiple rounds of ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/24
Inventor 张洪君王浩刘恩宏许占双吴洪举杨贵容梁秀荣郝瑞辉
Owner PETROCHINA CO LTD
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