Steam assisted gravity drainage technology of double-branch horizontal well

A technology for assisting gravity and horizontal wells, which is applied in wellbore/well components, production fluids, earthwork drilling and production, etc. It can solve the problems of high drilling and oil production costs, reduce drilling and oil production costs, and increase oil recovery and oil production speed. Effect

Active Publication Date: 2014-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing SAGD process that requires two horizontal wells to be drilled and the cost of drilling oil production is high

Method used

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  • Steam assisted gravity drainage technology of double-branch horizontal well

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Embodiment Construction

[0009] Such as figure 1 As shown, a steam-assisted gravity drainage process for a double-branched horizontal well, the following tools are required in the process of realizing this process: main borehole packer 1, injection-production valve 2, directional joint 3, directional upper bell mouth 4, Hollow deflector 5, hanger 6, Z2 inserted tubing 7, Z2 packer 8, sealing joint II 9, base 10, casing 11, sealing joint I 12, Z1 packer 13, Z1 inserted tubing 14. The process steps are as follows: in the completion process of the bibranch horizontal well, first install the directional upper bell mouth 4, and keep the slope orientation of the directional upper bell mouth 4 consistent with the hollow deflector 5; secondly, Z1 branch borehole and Z2 The branch wellbore is run into the packer and the sealing joint respectively to seal off the annulus of the Z1 branch wellbore and the Z2 branch wellbore to maintain pressure tightness; again, the main wellbore packer 1, the injection-producti...

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Abstract

The invention relates to a thermal recovery technology of a branched horizontal well, in particular to a steam assisted gravity drainage technology of a double-branch horizontal well. The steam assisted gravity drainage technology of the double-branch horizontal well comprises the following steps that (1) in the process of well completion of the double-branch horizontal well, an upper directional horn-shaped opening is installed, and the slope direction of the upper directional horn-shaped opening is kept to be consistent with the direction of a hollow inclination guiding device; (2) a packer and a seal joint are installed in a branch well Z1 and a branch well Z2 respectively, and are used for sealing the branch well Z1 and enabling the branch well Z2 to form an annular space, and pressure leakproofness is kept. According to the steam assisted gravity drainage technology of the double-branch horizontal well, due to the fact that the technical advantages of the double-branch horizontal well are made full use of, the purposes that the recovery ratio of heavy oil and the recovery ratio of super heavy oil are increased, the oil production rate of heavy oil and the oil production rate of super heavy oil are increased, the well drilling cost and the oil production cost are reduced, the hard-to-recover reserve is used economically, and the workload of two common horizontal wells is accomplished through one double-branch horizontal well are achieved. The defects that according to an existing SAGD technology, two horizontal wells need to be drilled, and the well drilling cost and the oil production cost are high are overcome.

Description

Technical field: [0001] The invention relates to a thermal recovery technology of a branched horizontal well, in particular to a steam-assisted gravity drainage technology of a double-branched horizontal well. Background technique: [0002] In recent years, lateral wells have been used on a large scale at home and abroad to develop heavy oil reservoirs, buried hill reservoirs, low-permeability reservoirs and remaining oil in old areas to tap the potential, greatly improve the recovery rate and oil production speed, reduce drilling costs and oil production costs, and have achieved great success. Huge economic and social benefits. [0003] At present, most of the heavy oil and ultra-heavy oil still need to be recovered by thermal recovery. Steam-assisted gravity drainage (SAGD) is a thermal recovery method with a high recovery rate. Drill a pair of horizontal wells, one above and one below, with a certain distance between them. The upper well is used to inject steam into the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 赵展史红艳刘乃震余雷喻晨尚宪飞陈振刚李敏邓旭杨林李虎高扬
Owner BC P INC CHINA NAT PETROLEUM CORP
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