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Gas injection swallowing-spitting method

One kind of gas injection huff and puff and another group of technologies are applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., which can solve the problems of difficult deployment of well pattern, no better solution, poor development effect, etc., and reduce the Effect of decline rate and enhanced oil recovery

Active Publication Date: 2016-02-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for low-permeability reservoirs developed by multi-stage fractured horizontal wells, CO 2 The well pattern of flooding is difficult to deploy, and due to too many fracturing fractures, gas channeling is serious and the development effect is poor; single well CO 2 There are also many applications in the huff and puff field. Because the reservoir permeability is too low, CO 2 It is difficult to enter the deep part of the reservoir and cannot fully contact with crude oil, resulting in a low oil change rate for throughput and poor economic benefits for on-site application
To address these problems, there has been no better solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Group the fracturing fractures of multi-stage fracturing horizontal well C in block B of F oilfield

[0058] According to fine geological research results, etc., all the fracturing fractures of Well C are divided into two groups, such as figure 1 shown.

[0059] (2) Set any group of fracturing fractures as the depletion production fracturing group, and set the other group of fracturing fractures as the huff and puff fracturing group.

[0060] The injected gas is CO 2 , under the bottomhole flow pressure of the same working system, the effect of huff and puff of all fractures and the effect of flooding by grouping of fractures were compared, Figure 2-4 It can be seen that compared with single well stimulation, the oil production of single well flooding increased by 5309m 3 , the recovery rate increased by 3.40%, and the gas-oil ratio was lower than that of a single well. The movement speed in Tibet has slowed down. It can be seen from Table 1 that, whether in f...

Embodiment 2

[0072] The injected gas becomes CH 4 , the injection-production parameters are the same as those in Table 2, and the effects of huff and puff and repellent are compared. Figure 5-7 It can be seen that the note CH 4 The effect of repelling vomiting is also better than the effect of swallowing. Compared with single well huff and puff, the oil production of single well flooding increased by 2533m 3 , the recovery factor increased by 1.63%, and the gas-oil ratio was lower than that of a single well, which indicated that the migration speed of the injected gas in the reservoir slowed down.

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Abstract

The invention relates to a gas injection swallowing-spitting method. By the method, the gas injection swallowing-spitting effect of a multistage fracturing horizontal well can be improved, fracturing cracks are divided into two groups through technological measures according to geological research results of blocks and positions of fracturing cracks of the horizontal well, one group is used for carrying out gas injection swallowing-spitting while the other group is used for production, and a new development mode with the displacement effect and the swallowing-spitting effect in a reservoir is formed, so that the purposes of enhancing interaction between matrix crude oil and injected gas and improving gas injection recovery efficiency can be achieved. The gas injection swallowing-spitting method has the excellent guiding effect on energy replenishing of the multistage fracturing horizontal well of a low-permeability and ultra-low-permeability oil deposit.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a gas injection huff and puff method. Background technique [0002] With the increasing demand for energy year by year, oil prices have continued to run at high levels in recent years. In order to meet the global demand for energy, many low-permeability and ultra-low-permeability oil and gas reservoirs have been put into development one after another by using multi-stage fracturing horizontal wells, such as the Honghe Oilfield in the Ordos Basin in my country and the Brazeau Oilfield in Canada. [0003] Generally speaking, multi-stage fracturing horizontal wells increase the controlled reserves of a single well and reduce the seepage resistance in the near-wellbore zone, thereby improving the development effect of the block. According to the experience of the United States, the average daily production and final cumulative production of multi-stage fracturing horizo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/26
Inventor 高慧梅孙红军谭学群马安来邱茂君张俊法廉培庆张诗洋杜秀娟高敏
Owner CHINA PETROLEUM & CHEM CORP
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