A method for interwell pumping in low permeability oilfields
A low-permeability, oil well technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problem that the dynamic fluid level data cannot reflect the real situation of the formation, so as to avoid the unsuitable interval pumping system and optimize the development Well time and well shut-in time, the effect of reducing electricity cost
Active Publication Date: 2020-03-31
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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[0004] The invention provides a method for formulating the pumping system between oil wells in low-permeability oilfields. In order to overcome the problems that the dynamic liquid level data cannot reflect the real situation of the formation in the dynamic liquid level data method, it proposes to use the measured bottom hole pressure data as the basis for calculation, and to maximize the production. The Method of Determining Oil Well Interval Pumping System Based on the Principle
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[0042] The specific implementation of the method will be described below with an example of a well. The basic data of an oil well are as follows: pump diameter: 44mm; pumping unit stroke: 1.2m; stroke times: 6min -1 ;casing inner diameter: 124mm; tubing outer diameter: 73mm; pump hanging depth: 415m, the current intermittent pumping system is 4 hours on, 20 hours off, daily liquid production: 0.42m 3 / d.
[0043] Step 1: Measure oil well pressure data;
[0044] Step 1-1: Bottomhole pressure gauge in oil well operation;
[0045] Step 1-2: Start the pumping of the oil well, and stop the pumping when the fluid production of the oil well is stable or equal to the original fluid production;
[0046] Step 1-3: Determine the oil well pressure recovery time according to the geological conditions of the oil well, and start pumping after the well shutdown time is reached;
[0047] Step 1-4: Stop pumping when the fluid production of the oil well is stable or equal to the original flu...
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The invention relates to the field of petrochemical industries, in particular to a low-permeability oil-field oil-well interval-pumping method. The low-permeability oil-field oil-well interval-pumpingmethod comprises the following steps that the formation pressure pe and an oil well inflow dynamic curve QS (p) are obtained; an oil well pump efficiency curve eta (t) is obtained; any point (t, p) on a shut-in well pressure recovery curve Pr (t) serves as the oil well begin-pumping pressure, and the oil well output Q and the visible daily output (Q') within an interval-pumping period are calculated; the visible daily output under different begin-pumping pressure is calculated, the working system during the maximum visible daily output is taken as the optimal interval-pumping system during the stop-pumping pressure p0, the well stopping time is (t-T1), and the well opening time is (T2-t); and different stop-pumping pressure is selected, the maximum visible daily output under a series of stop-pumping pressure is calculated, and the working system corresponding to the maximum value of the visible daily output is the optimal interval-pumping system of an oil well. The low-permeability oil-field oil-well interval-pumping method eliminates the error caused by the fact that the working fluid level converts the bottom hole pressure because the working fluid level has a bubble section.
Description
technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for pumping oil wells in low-permeability oil fields. Background technique [0002] With the continuous deepening of oilfield exploration and development, the decline of formation energy and low permeability can lead to insufficient fluid supply capacity of oil wells and production decline. Due to the uncoordinated supply and discharge of oil wells, the pumping unit has been operating in a low-efficiency state for a long time. This not only causes energy waste but also increases equipment wear and tear, resulting in high crude oil production costs. For this kind of oil well, the common method in China is to produce by thinning out. Whether the pumping system between oil wells is reasonable is the key to pumping between oil wells. [0003] At present, the major oilfields basically formulate the pumping system between oil wells based on human experience or oil well...
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IPC IPC(8): E21B43/12
CPCE21B43/121
Inventor 符喜德赵亚杰黄华高庆华董涛刘通刘建刚倪军
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP