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Reservoir modifying method through forming crack network by temporary plugging turning in cracks

A technology for reservoir reconstruction and fractures, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., and can solve problems such as high leakage, large formation damage, and difficulty in completely breaking gel

Active Publication Date: 2015-11-25
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All the above-mentioned diversion methods have certain limitations: foam diversion cannot be used in oil reservoirs, and is strictly limited by temperature. Nitrogen equipment; chemical particles can be divided into different types such as oil-soluble resin, benzoic acid and rock salt according to the composition. The melting point of oil-soluble resin is too low to be used in high-temperature wells, while the melting point of benzoic acid is higher, but the melting point in water-based solution The solubility is too high; the cross-linked polymer steering technology has great damage to the formation, and it is also difficult to completely break the gel; the cost of viscoelastic surfactant steering is high

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  • Reservoir modifying method through forming crack network by temporary plugging turning in cracks

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Embodiment 1

[0084] This embodiment provides a reservoir stimulation method in which fractures are temporarily blocked and diverted to form a fracture network. Taking Well KSA in the Tarim Basin Oilfield as an example, acid fracturing is carried out. Well KSA is a pre-exploration well in the Tarim Oilfield. The target layer is the Paleogene glutenite section and the Cretaceous Bashijiqike Formation. The reconstructed well section is 6805.0-6930.0 meters in the Bashijiqike Formation. Natural fractures are developed in the reservoir, but they are mostly filled or half-filled by carbonate rocks, and the angle between the natural fractures and the maximum horizontal stress is relatively large. During the transformation, it is necessary to use the process of pressurization and steering in the fracture to stimulate more natural fractures, so as to improve the network degree of fractures and greatly increase the production capacity. According to construction needs, carry out two in-seam steering....

Embodiment 2

[0105]This embodiment provides a reservoir stimulation method in which fractures are temporarily blocked and diverted to form a fracture network. Taking Well KSB in the Tarim Basin Oilfield as an example, hydraulic sand fracturing is implemented for oil wells. Well KSB is a development well in Tarim Oilfield. Department: Bashki Chik group. The reconstructed well section is 6787.0-6893.0 meters in the Bashijiqike Formation, and there are 96 fractures in the micro-resistance imaging of the reservoir. During the reconstruction, it is necessary to use the process of pressurization and diversion in fractures to stimulate more natural fractures to improve the degree of fracture network , greatly increasing production capacity. According to the construction needs, perform an in-seam steering.

[0106] The pipe string structure (from top to bottom) of turning in the fracture to form a fracture network acid fracturing construction is: tubing hanger + double male nipple + 114.3×12.7mm...

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Abstract

The invention provides a reservoir modifying method through forming a crack network by temporary plugging turning in cracks. The method comprises the following steps: injecting a temporary plugging turning material liquid into a reservoir man-made crack and forming a bridge plug in the deep part of the crack, forcing the crack to turn and form a plurality of cracks, using an active fluid or an acid fluid to activate reservoir micro-cracks, and forming the crack network. The method can form the man-made crack network in unconventional oil-gas reservoirs such as low-permeability, ultra low permeability oil-gas reservoirs, tight oil reservoirs and shale oil-gas reservoirs, so as to increase the contact area to the reservoirs and greatly shorten the seepage distance and the seepage resistance of the oil and gas in the reservoirs towards the cracks in the arbitrary directions, and furthermore the single well yield and the final recovery efficiency are increased.

Description

technical field [0001] The invention relates to a reservoir reconstruction method for temporarily blocking and turning to form a fracture network in a fracture, belonging to the technical field of petroleum and natural gas exploitation. Background technique [0002] Fractured oil and gas reservoirs occupy a very important position in the production and reserves of oil and natural gas in the world. According to the rock types of its reservoirs, it can be divided into two categories: carbonate rock and other sedimentary rock fractured oil and gas reservoirs, among which carbonate rock fractured oil and gas reservoirs are the most important. In recent years, with the acceleration of the exploration and development of unconventional oil and gas resources such as tight oil, tight gas, and shale gas, unconventional oil and gas resources have become a hot spot in the world. Natural fractures are commonly developed in these unconventional reservoirs, which are typical fractured oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27C09K8/68C09K8/72C09K8/80C09K8/88
Inventor 周福建张福祥刘玉章杨向同刘雄飞袁学芳邹国庆刘举黄龙藏张杨刘会锋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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