Inversion method for water absorption profile of horizontal well based on temperature measurement
A water absorption profile and temperature measurement technology, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of long test period, high cost, low prediction accuracy, etc., and achieve improved water injection efficiency, convenient calculation, cost-saving effect
Pending Publication Date: 2022-01-21
成都恒诺晟华能源科技有限公司
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Problems solved by technology
The splitting coefficient method, water absorption profile interpolation method and numerical simulation method mainly have problems such as inaccurate calculation results, long test period and high cost.
However, the water absorption profile prediction method based on data mining mainly has the problems of requiring a small amount of water absorption profile data and low prediction accuracy.
Method used
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Embodiment 1
[0099] A horizontal injection well in an oilfield performs water injection operation, the injection fluid is water, the injection time is 4 hours, the well diameter is 7 inches, and the injection flow rate is G in =1.7kg / s (150m3 / d). The fluid temperature at the beginning of the horizontal section was 40°C, and the temperature in the undisturbed formation at the far end was 70°C. There is a 28m long impermeable zone (casing) at the horizontal section of the well. Formation parameters and fluid parameters are shown in Table 1:
[0100] Table 1 Formation parameters and injection fluid parameters of an oilfield
[0101]
[0102] For the above embodiment combined with the water absorption profile inversion method based on temperature measurement, the specific steps include:
[0103] Step 1: Construct the inversion model of the water absorption profile, and derive an inversion model suitable for inversion of water injection volume according to the heat transfer equation and e...
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The invention provides an inversion method for a water absorption profile of a horizontal well based on temperature measurement. The method comprises the steps: constructing a water absorption profile inversion model: deducing an inversion model suitable for inversion of the water injection rate according to a heat transfer equation and an energy equation of a wellbore and a far wellbore zone in a water injection process; constructing an inversion error function: constructing the error function by the temperature gradient deduced by the inversion model and the temperature gradient deduced by the heat transfer model semi-analytic solution; measuring the well wall temperature and dividing intervals: measuring the well wall temperature of the water injection well after the water injection construction is finished by using a distributed optical fiber sensor, and dividing the horizontal well section into a plurality of intervals according to the obtained temperature data; and calculating the water absorption amount of each interval: substituting the temperature value of each coordinate point into the error function of each interval, solving the minimum value of the error function of each interval, and iteratively inverting the water injection amount of each interval in the process of minimizing the error function.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an inversion method for water absorption profiles of horizontal wells based on temperature measurement. Background technique [0002] In order to maintain formation pressure and increase the injection volume of water injection wells, horizontal wells have been widely used in water flooding operations. To maximize oil and gas recovery during water flooding operations, the injected fluid must be in contact with the remaining oil and gas in the reservoir as much as possible. The sweep efficiency of the injected fluid mainly depends on the heterogeneity of the reservoir. High-permeability flow channels, fractures or different geological facies sequences will lead to different sweep efficiencies in waterflooding operations. The injected fluid will preferentially flow through pores with relatively high permeability, and cannot contact the oil and gas in pores wit...
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IPC IPC(8): E21B43/20E21B47/07E21B49/00G06F30/20
CPCE21B43/20E21B47/07E21B49/00G06F30/20E21B2200/20Y02A10/40
Inventor 王桂君
Owner 成都恒诺晟华能源科技有限公司