Pressure monitoring method used for judging incoming-water-direction of multistage fracturing horizontal well
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A pressure monitoring and horizontal well technology, which is applied in the fields of oil and gas production and multi-stage fracturing horizontal well oil production, can solve the problems of not providing the direction of water flow, not considering the interference effect of water injection wells, and poor fitting effect. The operation and method are simple and easy to understand, and the effect of improving production efficiency
Active Publication Date: 2018-02-23
CHINA UNIV OF PETROLEUM (BEIJING)
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However, the above-mentioned patents only provide the process string, and do not provide a specific method for judging the direction of water flow. Using conventional methods, the existing models and methods for multi-stage fracturing horizontal wells do not consider the interference of water injection wells. The characteristic fitting effect of the measured pressure derivative curve decline is not good
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Embodiment 1
[0081] Such as figure 1 As shown, in the injection-production well pattern of vertical well water injection and multi-stage fracturing horizontal well oil production (such as five-point well pattern, seven-point well pattern), the present embodiment takes the five-point well pattern as an example to implement a A pressure monitoring method for judging the direction of water flow in a multi-stage fractured horizontal well, comprising the following steps:
[0082] ①Monitor the bottom hole pressure change data of multi-stage fracturing horizontal wells;
[0083] ②Considering the changes in the working system of the surrounding water injection wells, design the interference test between the water injection wells and the multi-stage fracturing horizontal wells;
[0084] ③Establish the bottom hole pressure analysis chart of multi-stage fractured horizontal wells under the interference of water injection wells;
[0085] ④Fit and analyze the measured bottom hole pressure data to obt...
Embodiment 2
[0135] In this embodiment, a multi-stage fracturing horizontal well is selected in a tight oil reservoir, and the initial fluid production of the multi-stage fracturing horizontal well is 9.9m 3 / d, there are five water injection wells around the horizontal well, respectively numbered water injection well 1, water injection well 2, water injection well 3, water injection well 4, water injection well 5, and their water injection volumes are 30, 20, 25, 20, 15m 3 / d, and the distances from multi-stage fractured horizontal wells are 457, 490, 519, 436, and 600m, respectively. The schematic diagram of the well location is as follows: Figure 4 shown. The pressure monitoring method for judging the direction of water flow in a multi-stage fracturing horizontal well in this embodiment includes the following steps:
[0136] ①Monitor the bottom hole pressure change data of multi-stage fracturing horizontal wells;
[0137] ②Considering the changes in the working system of the surroun...
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Abstract
The invention provides a pressure monitoring method used for judging the incoming-water-direction of a multistage fracturing horizontal well. The pressure monitoring method comprises the following steps of monitoring bottom hole pressure change data of the multistage fracturing horizontal well; considering the change of the work systems of surrounding water injection wells, and designing an interference testing well between the water injection wells and the multistage fracturing horizontal well; building a bottom hole pressure analysis chart of the multistage fracturing horizontal well under the interference of the water injection wells; conducting fitting analysis on the measured bottom hole pressure data to obtain crack and reservoir parameters on the condition that the water injection amount of different water injection wells is changed, determining the communication conditions among wells, and judging the incoming-water-direction by analyzing and comparing the parameters which arefitted under the work systems of different water injection wells. The pressure monitoring method used for judging the incoming-water-direction of the multistage fracturing horizontal well is simple, understandable, and easy to operate. Since the change of the water injection amount of the water injection wells is considered, the incoming-water-direction of the multistage fracturing horizontal wellcan be accurately judged; meanwhile, using the method to monitor the pressure of the multistage fracturing horizontal well better conforms to actual conditions, and the accuracy of pressure monitoring explanation is improved.
Description
technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to the field of multistage fracturing horizontal well oil production in low-permeability and tight oil reservoirs. Background technique [0002] The combined injection-production method of vertical well water injection and multi-stage fracturing horizontal well production has become a common phenomenon in the development of low-permeability and tight oil reservoirs. Generally, the production of multi-stage fracturing horizontal wells declines rapidly. rate rose rapidly. The water production position of the multi-stage fractured horizontal well can be effectively identified by the ground potential method of the horizontal well and the fluid production position diagnosis method of the multi-stage fractured horizontal well. [0003] In an injection-production unit, a multi-stage fractured horizontal well corresponds to multiple water injection wells. Although the water outlet l...
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