Track while drilling control method of shali shale oil horizontal well
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A trajectory control, horizontal well technology, applied in the field of oil exploration, to achieve the effect of precise time-depth relationship
Active Publication Date: 2019-08-09
PETROCHINA CO LTD
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[0006] The purpose of the present invention is to provide a thin-bed shale oil horizontal well trajectory control method while drilling in order to solve the above problems, which solves the current existing problems
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no. 1 example
[0058] The first embodiment: as Figure 1-7 As shown, the present embodiment adopts the following technical scheme: a method for controlling the trajectory while drilling a thin-bed shale oil horizontal well, comprising the following steps:
[0059] 1) Determine the optimal artificially synthesized seismic trace, and generate the seismic sweet spot time window according to the seismic velocity of the sweet spot section of the horizontal well;
[0060] 2) Establish the standard logging response curve of the sweet spot section by using the corresponding shape of the well logging curve of the known well, and generate the predicted logging curve according to the design trajectory of the shale oil horizontal well;
[0061] 3) During the process of drilling, adjust the trajectory while drilling in time according to the real-time logging curve and refer to the logging absolute value and variation range of the marked interval.
[0062] Wherein, in the step 1), the optimal artificiall...
no. 2 example
[0095] 1) Determine the optimal synthetic seismic trace, and generate the seismic sweet spot time window according to the seismic velocity of the horizontal well sweet spot section.
[0096] ① Well seismic calibration for all intervals.
[0097] a. Determine the optimal synthetic seismic trace.
[0098] G 1 , G 2 and G 3 There are 3 geological layers in total, and the seismic traces are artificially synthesized using the acoustic time difference logging curve (AC), and the corresponding time depth is G t1 , G t2 and G tn , the seismic interpretation interface is numbered T from top to bottom corresponding to the time and depth 1 , T 2 and T n , as attached figure 1 -A shown.
[0099] Define the well-seismic fit degree DF formula:
[0100] Among them, G t1 , G t2 ,...,G tn is the time depth corresponding to the synthetic seismic trace, T 1 , T 2 ,...,T n Interpret interfaces for seismicity corresponding to time-depth.
[0101] Search the minimum value of DF ...
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Abstract
The invention discloses a track while drilling control method of a shali shale oil horizontal well. The track control while drilling method includes the following steps that (1) an optimal synthetic seismic trace is determined, and according to the seismic velocity of the sweet spot section the horizontal well, a seismic sweet spot time window is generated; (2) a standard logging response curve atthe sweet spot section is established by using the corresponding form of a well log of a known well, and a prediction logging curve is generated according to a designed track of the shale oil horizontal well; and (3) in the process of while drilling, according to a real-time logging curve, and in reference to a logging absolute value and the variation amplitude of a marker bed section, a track while drilling is adjusted in time. The track while drilling control method has the beneficial effects that (1) in the case of human intervention, a more accurate time-depth relationship is established;(2) on the basis of time-depth relationship establishment, the seismic profile position of the top and bottom of a sweet spot is calculated, the sweet spot time window is determined, and during drilling, the track while drilling is optimized by projecting the position of a drill bit in real time; and (3) a formation standard logging curve of the area is established by using the known well and theformation dip angle, the track is adjusted in time, and the reservoir drilling rate is increased.
Description
[0001] Technical field: [0002] The invention relates to the technical field of petroleum exploration, in particular to the technical field of a method for controlling the trajectory while drilling a thin-bed shale oil horizontal well. [0003] Background technique: [0004] The vertical thickness of the marine shale oil sweet spot is generally between 20 and 90 m, the plane distribution is stable, and the formation occurrence is stable, which is suitable for large-scale development of horizontal wells. my country's oil-bearing basins are dominated by continental lake basins, and the spatial distribution stability of continental shale oil sweet spots is relatively poor. The vertical thickness is generally between 6 and 15 m, and the plane distribution has an obvious thickness center. The thickness of sweet spots is thin and changes rapidly. , the plane distribution stability is poor, which brings difficulties to how to accurately control the well trajectory to continuously dril...
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