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Carbon oxide huff-n-puff, water control and oil increment method for horizontal well

A carbon dioxide, horizontal well technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of difficult operation, inability to achieve economical efficiency, high technical requirements, and achieve the effect of simple construction

Active Publication Date: 2012-07-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water finding, mechanical sealing or plugging agent plugging methods have complex construction techniques, many procedures, and difficult operations. Multi-process construction requires high technical requirements, often resulting in rework, secondary operations, etc. The construction risk is high and the investment is large. The average is more than 1 million yuan
Low efficiency, unable to achieve economic efficiency or poor economic efficiency
[0004] The main reasons are: firstly, the water-seeking technology cannot fully and truly reflect the water zone, and it is difficult to confirm the oil-water interface, nor can it reflect whether the non-water zone has oil production potential; It will quickly form a bypass flow, making the stuck or plugging measures ineffective; the third is to cause damage to the reservoir near the wellbore, which will lead to a decrease in the permeability of the oil phase of the reservoir

Method used

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  • Carbon oxide huff-n-puff, water control and oil increment method for horizontal well
  • Carbon oxide huff-n-puff, water control and oil increment method for horizontal well
  • Carbon oxide huff-n-puff, water control and oil increment method for horizontal well

Examples

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Effect test

example 1

[0064] 1. Well selection: an abnormal water-flooded well in a high-porosity and high-permeability conventional heavy oil reservoir with side-bottom water. For the structural location, see figure 2 . Porosity 30.75%, permeability 905.3md, reservoir depth 1730m; reservoir pressure 15.4MPa, formation pressure coefficient 0.89; reservoir temperature 63℃; crude oil viscosity 475mPa.s; crude oil density 0.94g / cm 3. The formation water salinity is 1037. Due to the communication between the well fluid and the bottom water during the production process, the water content is high immediately after production, which is an abnormally high water content. Production status image 3 . The thickness of the oil layer is 6m, and the production section of a single well is 44m / 1 section. The well trajectory is shown in Figure 4 . The controlled geological reserves are 2.5wt, the recoverable reserves are 0.5wt, the remaining recoverable reserves are 0.5wt, and the remaining oil saturation ...

example 2

[0107] 1. Well selection: a horizontal well in a conventional heavy oil reservoir with edge and bottom water, located at a higher part of the fault root, see Figure 7 . The production well section is 173.7m / 2 sections; the thickness of the oil layer is 6m, see Figure 8 . Reservoir depth: 1530m; reservoir pressure: 14.8MPa; porosity 29.09%, permeability 148.8md; reservoir temperature: 60°C; crude oil viscosity: 116mPa·s (underground) / 240mPa·s (ground 50°C), Crude oil density: 0.9410g / cm 3 ; The geological reserves of the small layer are 7wt, the recovery degree is only 4.0%, and the calibrated water flooding recovery rate is 10.0%. The water cut rises rapidly in the early stage of production, and the water cut reaches 100% when the recovery rate is only 4%. The analysis shows that the initial liquid volume is high, and the high liquid production intensity causes local bottom water coning, see Figure 9 . Compliant with CO 2 Huff and puff control water increase oil well ...

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Abstract

The invention relates to a CO2 (carbon oxide) huff-n-puff, water control and oil increment method for a horizontal oil well, which includes: using a process string to inject appropriate CO2 into an abnormally water flooded horizontal well with proper conditions (the abnormally water flooded horizontal well refers to an extra-high-water-cut well with a recovery percentage lower than 80% of a calibrated water displacement rate and water cut incompatible with the recovery percentage); shutting down (shutting in) the well for a certain period of time to enable the injected CO2, an oil reservoir and reservoir fluids to physically and chemically react, and accordingly swelling and thinning crude oil and reducing surface tension; carbonating water to thicken the water; and energizing the reservoir, improving permeability and the like. By means of production control after well startup, evident water-cut reduction and evident oil yield increase can be achieved for the abnormally water-flooded extra-high-water-cut horizontal wells (including high-inclination wells with deviation angles larger of from 45 DEG to 86 DEG, and water control and oil increment are achieved.

Description

technical field [0001] The invention relates to a horizontal well CO in petroleum engineering 2 The method of controlling water and increasing oil by throughput; Background technique [0002] Horizontal oil well - a directional oil well whose well deviation angle is greater than 86° and maintains a certain length of horizontal section in the target layer. In the development of oil reservoirs, the development of horizontal wells is an important development technology that has been gradually promoted in China in recent years. With the prolongation of the development time of horizontal wells, the number of wells continues to increase, and the water cut rises to cause the water flooding problem to become more and more prominent, and most of the wells are abnormal water flooded at a low recovery level (that is, tongue or fingering causes some well flooded). [0003] Existing water control technologies for horizontal wells generally adopt the method of finding water first, and ...

Claims

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Application Information

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IPC IPC(8): E21B43/16
CPCY02P90/70
Inventor 马会英陈仁保李勇叶盛军李东民冯建松汤蒙刘丰忠石琼林杨小亮
Owner PETROCHINA CO LTD
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