Composite profile control system and construction method for plugging by using composite profile control system

A construction method and system technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problems of profile control effect and economic benefit deterioration, single profile control agent construction method, etc., to achieve extended profile control Effects of cutting validity period, improving particle injection and injection depth, and reducing cost

Inactive Publication Date: 2017-07-14
河南易发石油工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As mentioned above, although there are many types of plugging modifiers currently used in the field, each type of plugging modifier has certain limitations in meeting the needs of oilfield plugging regulation. A single profile control a

Method used

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  • Composite profile control system and construction method for plugging by using composite profile control system
  • Composite profile control system and construction method for plugging by using composite profile control system
  • Composite profile control system and construction method for plugging by using composite profile control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1 Typical block: Wangyao area of ​​Changqing Oilfield, which belongs to heterogeneous low-permeability fractured reservoir.

[0084] From March to November 2013, a total of 7 wells were profile-modified in Wangyao District, corresponding to the cumulative increase of 1578.93 tons of horizontal wells, the cumulative precipitation of 2852.12 m3, the comprehensive water cut decreased by 15.9 percentage points, and the average oil increase of a single well group was 225 tons.

[0085] Figure 10 It is a comparison chart of the production situation before and after the measures in Wangyao District.

Embodiment 2

[0086] Example 2 Well Wang 26-38 in Changqing Oilfield

[0087] Production status before the measures: The two horizontal wells corresponding to this well were put into production in 2012: Danping 7 was put into production in September, with a high water cut of nearly 100%, and Danping 9 was put into production in December, and the water cut was as high as 89.5%. Figure 11 Schematic diagram of profile control well location for Wang 26-38 well group.

[0088] The well was constructed from March 29 to June 6, 2013, and a total of 4620m of plugging agent was injected 3 , plugging agent dry material 77.694t, initial construction pressure 8.8MPa, maximum pressure 11.4MPa, completed the deep profile control construction design.

[0089] Figure 12 It is the construction curve diagram of Well Wang 26-38. Figure 13 It is the pressure drop curve before and after profile control of Well Wang 26-38.

[0090] After the implementation of deep profile control, the water injection pres...

Embodiment 3

[0091] Example 3 Wells NP12-50 and NP12-X66 in Jidong Oilfield

[0092] Wells NP12-50 and NP12-X66 were simultaneously implemented composite deep profile control on 2016.9.1-11.24 and 2016.9.8-12.6 respectively, and the well group corresponds to five oil wells NP12-X71-46-48-49-X74, Figure 16 It is a schematic diagram of profile control well locations in NP12-50 and NP12-X66 well areas. Figure 17 It is the current water injection string and profile control string diagram of Well NP (Nanbao) 12-50.

[0093] Well NP12-50 started profile control on September 1, 2016, and it took 85 days to complete profile control on November 24, with a total consumption of 8022m 3 .

[0094] The construction operation is basically normal, and the pressure rise is also normal. The injection pressure and injection volume are basically consistent with the design. In order to achieve a better oil stimulation effect, a composite slug is added on the basis of the total injection volume reaching th...

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Abstract

The invention relates to a composite profile control system, which comprises a high-strength cross-linked polymer profile control agent, a water displacement flowing direction change agent, a compound flocculation profile control agent and an oil displacement agent. According to the present invention, in order to improve the profile control effect and prolong the profile control lasting period, by considering the synergetic effect among the plugging agents, the plugging agents are subjected to cross injection in slugs; and by following the combined principle of plugging, controlling and displacement, the high-strength cross-linked polymer profile control agent capable of improving the swept volume and the displacement efficiency, the water displacement flowing direction change agent capable of improving the lasting period and the compound flocculation profile control agent are used and are subjected to alternating injection, and then the oil displacement agent is injected, such that the profile control and displacement requirements of the oil reservoir deep part can be met, the oil reservoirs having different permeabilities can be met, different profile control purposes and different process requirements can be met, the shear resistance and the swelling are improved, the cost is reduced, the strength and the temperature resistance are improved, and the particle injection and the injection depth are improved.

Description

technical field [0001] The invention relates to the technical field of oil reservoir exploitation, in particular to a composite profile control system and a construction method for plugging control using it. Background technique [0002] Profile control refers to the operation of plugging high-permeability layers from water injection wells, which can adjust the water absorption profile of water injection layers. Water plugging refers to the operation of plugging high permeability layers from oil wells, which can reduce the water production of oil wells. [0003] In the process of mining oil and natural gas, due to the heterogeneity in the spatial distribution and internal properties of oil and gas reservoirs, supplementing formation energy through water injection is the main measure adopted by most oilfields in my country. Due to the complexity and heterogeneity of the reservoir formation, when the water injection rate increases, a large amount of water will be produced fro...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/508C09K8/584E21B43/22
CPCC09K8/512C09K8/5083C09K8/584E21B43/16
Inventor 彭远庆杨和芳黎中兴文海峰李崇红孙志宏王丹
Owner 河南易发石油工程技术有限公司
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