CN101387195A

CN101387195A - Reverse-branch Hole gravity oil drainage extraction technology

Info

Publication number: CN101387195A
Application number: CNA2007100128471A
Authority: CN
Inventors: 刘坤芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-14
Filing date: 2007-09-14
Publication date: 2009-03-18

Abstract

The invention belongs to the technology of well drilling and completion oil extraction of an oil well in an oil field, and in particular relates to a gravity oil leakage oil extraction technology for an inverted branch well, wherein a main wellbore is drilled at first, and then hole expansion is performed on an oil-layer position; a plurality of branch wellbores are drilled on the circumference of the main wellbore, such as a first branch wellbore, a second branch wellbore, a third branch wellbore and so on; the branch wellbores are drilled into the main wellbore, so as to complete butt joint with the hole expansion position of the main wellbore; and the branch wellbores can be directional wells, horizontal wells and large-displacement wells. The technology adopts the casing program means of combination of the main wellbore and the plurality of the branch wellbores, thereby widening the oil extraction area to the maximum degree and improving the development degree of the crude oil reserve; the technology adopts the means of oil extraction of the main wellbore and oil leakage of the branch wellbores in virtue of the gravity, thereby improving the yield and simplifying the oil extraction technique; and due to adoption of the drilling means of drilling the main wellbore at first and drilling the branch wellbores on the circumference of the main wellbore, so as to realize junction of the branch wellbores and the main wellbore, the technology can be applied to low-yield oil fields of original blocks by means of large acreage and utilizes the prior oil well to perform side tracking junction.

Description

Reverse-branch Hole gravity oil drainage extraction technology

Affiliated technical field

The invention belongs to oilfield brill, completion oil production technology technology, particularly a kind of reverse-branch Hole gravity oil drainage extraction technology.

Background technology

At present, no matter which kind of resource industrial enterprise that image-stone oil is the same, along with the raising of exploitation level and the increase of yield, resource can reduce gradually, the resource exhaustion problem promptly appears, along with the development of economy type development scheme and the exploitation in marine oil gas field, Multilateral Wells exploitation petroleum resources technology more and more is subject to people's attention, a distinguishing feature of Multilateral Wells is to exist a master to prop up and a plurality of branches, conventional Multilateral Wells is to beat earlier main borehole, in main borehole, beat a plurality of branches then, technology realizes at a platform, yet at an old liberated area piece, beating a plurality of branch well holes in a main borehole is that conventional Multilateral Wells but is not most economical and the most rational development plan.

Summary of the invention

In order to overcome the problems referred to above, the invention provides a kind of well gravity drainage production technique that falls to divide, bore new well or utilize original oil well to make a call to a main borehole, eye then digs a branch well around main borehole, branch well hole bores and to reach behind the target zone and the main borehole tandem, main borehole selectivity completion, after the completion, the crude oil of branch well hole flows into main borehole under the effect of gravity, recover the oil by main borehole, develop the residue production capacity of old liberated area piece oil well to greatest extent, enlarge the oil recovery area, reduce cost for oil production, reduce the whole development cost.

The present invention solves the technical scheme that its technical problem takes: a kind of reverse-branch Hole gravity oil drainage extraction technology, its special character is: adopt and make a call to earlier a main borehole, then in the reaming of oil reservoir position, around main borehole, beat a plurality of wells, first well, second well, the 3rd well etc., well is crept into to main borehole, finish and the docking of main borehole reaming position, this well can be directional well, horizontal well and extended reach well.

At the old liberated area piece, a plurality of wells can be carried out sidetracking and main borehole tandem on the basis of old well, carry out the selectivity completion then in main borehole, finish brill, completion construction.

Will oil well pump sentence upper/lower positions to a well and main borehole tandem down, a well is a branch type structure upwards, and the crude oil in the well flows to or falls to main borehole under the effect of gravity, finishes oily compiling of flowing.

The invention has the beneficial effects as follows: technology adopts the casing programme mode of main borehole and the combination of Duo Zhi well, at utmost enlarged the oil recovery area, improved the crude oil reserve development degree, technology has adopted the main borehole oil recovery, branch well hole is by the mode of gravity drainage, improved output, simplified oil production technology, beat earlier main borehole owing to adopt, eye then digs a branch well around main borehole, making the drilling mode of branch well hole and main borehole tandem, is that the contrary of conventional Multilateral Wells implemented, thus this technology can large-area applications in old liberated area piece stripper field, promptly utilize original oil well to carry out the sidetracking tandem, saved the whole development cost.

Description of drawings

Accompanying drawing is a casing programme schematic diagram of the present invention

In the accompanying drawing: the 1st, main borehole, 2 is first branch well holes, and 3 is second branch well holes, and 4 is the 3rd branch well holes

The specific embodiment

Embodiment is described in conjunction with the accompanying drawings:

Embodiment one:

At first make a call to earlier a main borehole 1 in the by specification accompanying drawing, then in the reaming of oil reservoir position, make a call to first well 2, second well 3, the 3rd well 4 by tree type structure and creep into, finish and the docking of main borehole 1 reaming position to main borehole 1 around main borehole 1, first well 2, second well 3, the 3rd well 4 can be directional well, horizontal well and extended reach well.

Embodiment two:

The old liberated area piece, 3, the three wells 4 of 2, the second wells of first well are carried out sidetracking and main borehole 1 tandem on the basis of old well, carry out the selectivity completion then in main borehole 1, finish brill, completion construction.

Embodiment three:

Oil well pump down to propping up recovering the oil with upper/lower positions of well and main borehole tandem place, is finished integrated artistic and implemented.

Claims

1, a kind of reverse-branch Hole gravity oil drainage extraction technology, it is characterized in that: adopt and make a call to earlier a main borehole, then in the reaming of oil reservoir position, around main borehole, beat a plurality of wells, first well, second well, the 3rd well etc., well is crept into to main borehole, finish and the docking of main borehole reaming position, this well can be directional well, horizontal well and extended reach well.

2, the gravity drainage of falling branch production technique according to claim 1, it is characterized in that: at the old liberated area piece, a plurality of wells can be carried out sidetracking and main borehole tandem on the basis of old well, carry out the selectivity completion then in main borehole, finish brill, completion construction.

3, the gravity drainage of falling branch production technique according to claim 1, it is characterized in that: oil well pump is sentenced upper/lower positions to a well and main borehole tandem down, propping up well is branch type structure upwards, prop up the interior crude oil of well under the effect of gravity, flow to or fall, finish compiling of oil stream to main borehole.