Preheating method applied before oil production adopting double horizontal wells and oil production method adopting double horizontal wells
A dual-horizontal well and oil layer technology, which is applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of poor effect, low connectivity between steam injection wells and production wells, etc., and achieve high crude oil production. Effect
Active Publication Date: 2016-07-13
PETROCHINA CO LTD
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[0004] The main purpose of the present invention is to provide a kind of preheating method before oil production of double horizontal well and double horizontal well oil production method, to solve the problem in the prior art that the preheating process effect before carrying out double horizontal well oil production is not good, steam injection well Problems with low connectivity to production wells
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[0020] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0021] According to one aspect of the present invention, there is provided a method for preheating before oil production in a dual-horizontal well. The steam pipe 21 injects steam, and discharges downhole liquid through the first liquid discharge pipe 12 arranged in the steam injection well 10 and the second liquid discharge pipe 22 arranged in the production well 20, so that the steam injection well 10 and the production well 20 The degree of connectivity reaches the preset value.
[0022] The preheating method before the double horizontal well oil production of the present invention utilizes the first steam injection pipe 11 arranged in the steam injection well 10 and the second steam inject...
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The invention provides a preheating method applied before oil production adopting double horizontal wells and an oil production method adopting the double horizontal wells. The preheating method applied before oil production adopting the double horizontal wells comprises the following steps: steam is injected into a first steam injection pipe arranged in a steam injection well and a second steam injection pipe arranged in a production well, and a downhole liquid is drained through a first drainage pipe arranged in the steam injection well and a second drainage pipe arranged in the production well, so that the degree of communication between the steam injection well and the production well reaches a preset value. According to the preheating method applied before oil production adopting the double horizontal wells, the steam is injected into an oil reservoir through the first steam injection pipe arranged in the steam injection well and the second steam injection pipe arranged in the production well simultaneously to heat the oil reservoir, whether the double horizontal wells are well prepared for production is determined by detecting the degree of communication between the steam injection well and the production well, the oil reservoir is preheated sufficiently by the double horizontal wells, so that the oil reservoir is endowed with good production conditions, and higher crude oil yield can be realized when oil production is performed at the moment.
Description
technical field [0001] The present invention relates to oil exploitation technology, in particular to a method for preheating before oil extraction in double horizontal wells and a method for oil extraction in double horizontal wells. Background technique [0002] The dual-horizontal well oil production method is a method suitable for heavy oil production. This method can release steam to the crude oil layer through the steam injection well to heat the crude oil layer, so that the crude oil is gradually liquefied, and then through the production well arranged below the steam injection well. The liquefied crude oil is extracted to realize the efficient extraction of heavy oil. [0003] Before oil production in dual horizontal wells, it is necessary to preheat the oil layer through steam injection wells and production wells to improve the connectivity between steam injection wells and production wells, so that steam can smoothly form a steam chamber to press crude oil to produ...
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Inventor 霍进桑林翔杨果苏长强成永强郤一臻解阳波冯磊姜丹乔书红佟娟肖益李畅张洪源
Owner PETROCHINA CO LTD