Method for improving seam net complexity through circulation stress fracturing

A technology of cyclic stress and complexity, applied in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of limited production increase, complex vertical characteristics, and difficulty in fully producing oil layers. Yield effect

Active Publication Date: 2016-08-31
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the further decline of tight oil quality, sand-mud interbeds are developed vertically in the oil layer, and muddy and calcareous interlayers are more developed in the layer. The single-stage oil layer ...

Method used

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  • Method for improving seam net complexity through circulation stress fracturing
  • Method for improving seam net complexity through circulation stress fracturing
  • Method for improving seam net complexity through circulation stress fracturing

Examples

Experimental program
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Embodiment 1

[0036] This example provides a method for increasing the complexity of the fracture network through cyclic stress fracturing to solve the problem of limited production increase in tight reservoirs with sand-mud interbeds developed by volume fracturing technology. For tight reservoirs with sand-mud interbeds layer, the method at least includes the following steps:

[0037] (1) Establish a comprehensive evaluation method for the fracture network characteristics of cyclic stress fracturing in tight reservoirs with well-developed sand-mud interbeds, and determine the specific main controlling factors affecting fracture expansion;

[0038] (2) Establish an optimization method for key parameters of cyclic stress fracturing in tight reservoirs with well-developed sand-mud interbeds, and obtain specific cyclic stress pumping parameters.

[0039] Through the method provided in this example, the main controlling factors that affect the expansion of specific reservoir fractures and incre...

Embodiment 2

[0041] On the basis of embodiment 1, this embodiment provides a kind of figure 1 The method for increasing the complexity of the fracture network through cyclic stress fracturing, the above (1) Establishing a comprehensive evaluation method for the characteristics of the cyclic stress fracturing fracture network in tight reservoirs with sand-mud interbeds, at least includes: Step 1) Natural fracture characteristics Evaluation; Step 2) Evaluation of rock fracture characteristics; Step 3) Evaluation of stress field and its changes; Step 4) Evaluation of field crack testing.

[0042] Step 1) Evaluation of natural fracture characteristics:

[0043] The characteristics of natural fractures in reservoirs were evaluated by means of field outcrop observation, core description, and imaging logging interpretation, and the occurrence characteristics of natural fractures and rock mechanics characteristics were combined. , can open more natural cracks and form a complex network system of ...

Embodiment 3

[0069] On the basis of Example 2, the physical simulation test also includes a comparison of fracture network characteristics formed by linear stress pumping fracturing and cyclic stress pumping fracturing.

[0070] Through physical simulation tests, for specific reservoir rock samples, a comparative analysis of the fracture network characteristics formed by linear stress pumping fracturing and cyclic stress fracturing was carried out. Under different stress difference conditions, the characteristics of the fracture network produced by linear stress pumping and cyclic stress pumping are compared and analyzed. Through this experiment, we can find out the specific stress conditions suitable for cyclic pumping to generate complex fracture networks for specific reservoirs, because not under any stress conditions, cyclic pumping is more likely to generate complex fracture networks than linear pumping.

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Abstract

The invention provides a method for improving the seam net complexity through circulation stress fracturing. By aiming at a sand-mud interbedding developing compact reservoir, the reservoir longitudinal stress feature study is firstly started; concrete reservoir ground stress factors influencing the seam expansion are clarified; then, the influence of the circulation stress fracturing on the seam net expansion is studied; and concrete circulation pump injection parameters are optimized. Through the study on the reservoir longitudinal stress distribution and the stress circulation rock fracture experiment study, the sand-mud interbedding developing compact reservoir is discovered; through the circulation pump injection fracturing, the complicated rock shearing damage can be generated, so that the seam net complexity degree is very complicated; the breakthrough of a plurality of sand-mud stress shielding layers in the longitudinal direction can be realized, so that a plurality of thin inter-oil layers in the longitudinal direction can be sufficiently transformed; and a more complicated seam net system is formed in the transverse direction. Compared with the early stage mixed water volume fracturing technology, the method has the advantage that the great improvement of single-well yield is facilitated.

Description

technical field [0001] The invention belongs to the technical field of tight oil reservoir transformation, and in particular relates to a method for increasing the complexity of fracture networks through cyclic stress fracturing. Background technique [0002] Tight oil reservoirs have tight reservoirs, fine pore throats, strong reservoir heterogeneity, well-developed natural fractures, and complex seepage characteristics of reservoirs. The concept of volume fracturing and its optimization method were adopted in the early stage. The idea is to comprehensively apply downhole microseismic technology to evaluate horizontal well volume fracturing fractures and volume fracturing simulation research to form a network of artificial fractures and natural fractures in the reservoir. system. [0003] However, with the further decline of tight oil quality, sand-mud interbeds are developed vertically in the oil layer, and muddy and calcareous interlayers are more developed in the layer....

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B49/00
CPCE21B43/26E21B49/00
Inventor 樊凤玲赵振峰李宪文张矿生唐梅荣杜现飞王广涛李川曹宗熊郭小勇
Owner PETROCHINA CO LTD
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