Method for oil extraction in multi-bottom and multi-branch well by artesian injection
A self-flowing water injection and multi-branch technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of uneconomical oilfields and large investment, so as to save well slots, increase recovery, and improve oil formation The effect of formation pressure
Active Publication Date: 2013-01-02
上海石油天然气有限公司
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Problems solved by technology
[0004] Manual water injection needs to find water sources, water treatment equipment, booster equipment, and drill water injection wells. This water injection method requires a large investment and is uneconomical for oil fields with less crude oil production.
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[0016] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0017] Depend on figure 1 Visible: the present invention is realized through the following steps:
[0018] Drill the first well A and the second well B;
[0019] In the first well, the water injection branch 1 is drilled using conventional drilling techniques, and the water injection branch passes through the water layer 20 and the oil layer 3 under the water layer 20;
[0020] After the water injection branch is drilled, the slotted pipe is lowered to communicate between the water layer 20 and the oil layer 3; due to the high pressure of the water layer and the low pressure of the oil layer 3, the water in the water layer automatically flows into the oil layer 3 to replenish energy for the oil layer 3;
[0021] After the slotted pipe of the water injection branch 1 is lowered, the cement plug 4 is used to seal the junction of the branch and t...
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The invention relates to a method for oil extraction in a multi-bottom and multi-branch well by artesian injection. The method is realized through the following steps of: digging a first well and a second well; drilling injection branches in the first well by utilizing a general drilling technology, wherein the injection branches penetrate through a water layer and an oil layer below the water layer; putting down a slotted pipe to communicate the water layer and the oil layer, wherein water of the water layer naturally flows to the oil layer to complement the energy of the oil layer because the water layer has high pressure and the oil layer has low pressure; making a cement plug to plug the joint of a branch and a first borehole; extracting oil from the oil layer by adopting the second well; and drilling a first oil extraction branch and a second oil extraction in the first well by utilizing the general drilling technology to utilize the oil extraction function of the first well. Theinvention has the advantages of improving the strata pressure of the oil layer with poor water body energy, increasing the yield of the oil layer, realizing the two functions of oil extraction and artesian injection, saving well slots and providing convenience for subsequent production increase.
Description
technical field [0001] The invention relates to a method of oil recovery. Background technique [0002] The process of crude oil flowing from the ground to the wellhead can be divided into two flow stages, one is flowing from the formation to the bottom of the well, and the other is flowing from the bottom of the well to the wellhead. [0003] The energy of crude oil flowing from the formation to the bottom of the well mainly depends on the expansion of the formation fluid, the compression of the rock and the support of the water body. Among them, the elastic energy provided by the rock and the formation fluid is small, and the oil recovery is small. If there is no water body or the energy of the water body is very small, the formation pressure drops rapidly, the crude oil production declines rapidly, and the recovery rate is very low, then it is necessary to use artificial water injection to provide energy to drive oil. [0004] Manual water injection needs to find water s...
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IPC IPC(8): E21B43/20
Inventor 昌锋陈明高伟义
Owner 上海石油天然气有限公司