Infilling adjustment method suitable for horizontal well area of low-permeability oil field
A technology of horizontal well area and adjustment method, which is applied in earthwork drilling, data processing application, wellbore/well components, etc., and can solve the problems that the infill adjustment method is not applicable to horizontal well area, etc.
Active Publication Date: 2019-12-17
DAQING OILFIELD CO LTD +1
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Problems solved by technology
[0004] In view of this, the present invention provides an infill adjustment method suitable for horizontal well areas in low-permeability oilfields, which solves the problem that existing conventional infill adjustment methods are not applicable to horizontal well areas
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[0065] Take the encryption adjustment of Block 603 in Zhaozhou Oilfield as an example:
[0066] Since September 2003, block 603 of Zhouzhou has been developed with a combined vertical well-horizontal well pattern, and the oil-bearing area is 31.30km 2 , geological reserves 714.74×10 4 t. As of December 2016, a total of 206 oil and water wells have been put into production, including 118 oil wells, including 27 horizontal wells and 88 water wells. The wells in this area are all basic well pattern wells without infill. This area is encrypted.
[0067] Step 1: According to the actual production situation of Block 603 in Zhouzhou, apply theoretical formulas and oil field values to calculate the block economic limit well spacing and the lower limit of economic limit effective thickness. The values of the parameters in the formula are as follows (Table 1, the values of the parameters are based on the actual values in the oil field, which are known values):
[0068] Table...
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The invention discloses an infilling adjustment method suitable for a horizontal well area of a low-permeability oil field. The infilling adjustment method suitable for the horizontal well area of thelow-permeability oil field is characterized by comprising the steps that an economical extreme well spacing and an economical extreme effective thickness lower limit of the well area to be subjectedto infilling adjustment are calculated; a well position chart of the well area to be subjected to infilling adjustment is acquired and is compared with four horizontal well area infilling adjustment templates, and the corresponding horizontal well area infilling adjustment template is selected; an infill well position is deployed according to the corresponding horizontal well area infilling adjustment template; the well spacing between a planned infill well at the infill well position and an adjacent well is measured on the well position chart; the thickness of the planned infill well at the infill well position is predicted by means of the thickness of a sand body encountered by an oil-water well driller around according to a layered sand body chart of the well area to be subjected to infilling adjustment; and if the well spacing is greater than the economical extreme well spacing and the thickness is greater than the economical extreme effective thickness, the planned infill well isan infill well, otherwise, the planned infill well is a non-infill well. By the adoption of the infilling adjustment method suitable for the horizontal well area of the low-permeability oil field, theproblem that an existing conventional infilling adjustment method is not suitable for the horizontal well area is solved.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to an infill adjustment method suitable for horizontal wells in low-permeability oilfields. Background technique [0002] The development of horizontal wells has effectively promoted the effective production of low-permeability reservoirs. A certain block is a typical vertical-flat joint development well pattern. The comprehensive water cut of the block is 67.3%. In the water flooding blank area, the remaining oil is relatively enriched locally, and the overall recovery degree of the block is low, only 12.88%. [0003] At present, in response to such a situation, the method of infill adjustment is usually adopted. The conventional infill method in the vertical well area is not suitable for the well pattern in the horizontal well area. , the reserves at the near end of the horizontal well cannot be fully and effectively produced; secondly, due to the perforation encount...
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IPC IPC(8): E21B43/30G06Q30/02G06Q50/02
CPCE21B43/305G06Q30/0206G06Q50/02
Inventor 刘性全冷小勇孙美凤祖琳郑宪宝吴景峰宫宝刘仰东马玉玲王利郭晓娟
Owner DAQING OILFIELD CO LTD