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Simulative wellhead production method, and simulation and application of irregular planar well pattern

A technology for simulating wellhead and well pattern, which is applied in wellbore/well components, earthwork drilling, and fluid production, etc. It can solve the problems of inability to realize well pattern simulation research, inability to arrange simulated wells, and difficulty in implementing patented technologies.

Active Publication Date: 2013-01-23
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN250803 discloses a visual planar model making method, but its simulated wellhead technology needs to be improved: on the one hand, its simulated wells are usually arranged at the corners, and for irregular well patterns, simulated wells may need to be arranged inside the model. This patented technology Difficult to realize; second, the simulation research is based on the similarity criterion, requiring the smaller the diameter of the simulated well, the better. The simulated well diameter of the patented technology is larger, which affects the realization of the similarity criterion
At the same time, because the simulation wells inside the model cannot be arranged, it is impossible to realize the simulation research at the well pattern (well group) level

Method used

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  • Simulative wellhead production method, and simulation and application of irregular planar well pattern
  • Simulative wellhead production method, and simulation and application of irregular planar well pattern
  • Simulative wellhead production method, and simulation and application of irregular planar well pattern

Examples

Experimental program
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Effect test

Embodiment 1 3

[0041] Embodiment 1 Triangular well pattern

[0042] Triangular well pattern as shown figure 1 . In the visual plane physical model, three injection-production simulation wells 1#, 2#, and 3# are distributed in an isosceles triangle. The simulated reservoir structure can be homogeneous, heterogeneous, or sand-filled with dominant channels; the size of the visualized plane physical model is greater than 10×10cm; the injection-production simulation well adopts stainless steel pipes with an outer diameter of φ1. It is a test well pattern of one injection and two productions or two injections and one production test; the injection rate is generally set at 0.10-0.6ml / min according to the similar principle.

[0043] Triangular Well Pattern Water Injection Development

[0044] ①The visualized physical model of the triangular well pattern is saturated with water, saturated with oil, see Picture 1-1 . On-site formation water is used to drive oil, and the pump speed is 0.15ml / min....

Embodiment 2

[0049] Embodiment 2 anti-nine-point well pattern

[0050] The size of the model is generally greater than 10*10cm. It is possible to make a visual physical model with 1 / 4 of the inverted nine-point well pattern. The production process is the same as the triangular well pattern model used in the materials used. figure 2 . In the experiment, it is generally an experimental well pattern such as one injection and three productions, two injections and two productions, or three injections and one production; the injection rate is generally set at 0.10-0.6ml / min.

[0051] Experimental procedure:

[0052] ① After 1 / 4 inverse nine-point well pattern visualization physical model is saturated with water, it is saturated with oil, see diagram 2-1 . On-site formation water is used to drive oil, and the pump speed is 0.3ml / min.

[0053] ②2# water injection, injection speed 0.3ml / min, 1#, 3#, 4# extraction, injection 0.1PV (see Figure 2-2 a) When injecting 0.2PV, the injected water o...

Embodiment 3

[0055] Embodiment 3 edge water drive mode

[0056] Edge water reservoirs are ubiquitous in my country and the world, and the efficient development of edge water reservoirs is a world-class problem. The simulation development of the edge water reservoir adopts a simulation model of 15*20cm or more. The simulated edge water adopts a high-permeability strip and a channel is set in it to ensure that the entire edge water zone is completely connected to simulate the overall balanced pressure system of the edge water . A 1 / 4 inverted nine-spot well pattern was adopted, and the distance between the edge wells and the oil-water boundary was 1 / 4 in the experiment.

[0057] The test process is as follows:

[0058] (1) Model preparation: the edge water is partially saturated with water, the well pattern is partially saturated with oil, and the oil-water boundary distance is about 1-2cm, see Figure 3-1 ;Initial simulation of edge water elastic mining, 1#, 2#, 3#, 4# wells are all prod...

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Abstract

The invention discloses a simulative wellhead production method, and simulation and application of an irregular planar well pattern. The specific method comprises the following steps: 1) selecting a diameter of a wellhead as 0.5-1.0 mm; 2) marking a position of a simulative wellhead on a model soleplate glass, utilizing a drilling machine at a low speed of 300-600 r / min, drilling a hole on the glass through an alloy drill bit with the diameter of 0.5-1.0 mm, clearly cleaning the glass and a round hole, and drying as a model soleplate; and 3) installing an injection well, that is to say, after forming a model, selecting a medical injection needle steel pipeline having a smaller diameter than the round hole on the glass soleplate and a length of 1-2 cm, and solidifying the steel pipeline in the round hole of the glass soleplate by an adhesive, wherein the steel pipeline is in contact with a sand body in the model, the adhesive is uniformly distribution between the inner wall of the hole and the steel pipeline, and cannot permeate into the sand body in the model. According to the invention, a simulative test of the irregular well pattern is realized, and the high-low permeable injection and production system is researched through a parallel connection manner of the models.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a method for simulating the displacement process in the form of well pattern in irregular oil reservoirs, in particular to a method for making a simulated wellhead and simulating and applying an irregular planar well pattern. Background technique [0002] At present, the most widely used method for monolithic reservoirs is the regular well pattern method. Among them, there are not only well layout methods based on square well pattern (five-point system, reverse nine-point system, nine-point system, etc.), but also triangular well pattern (seven-point method, reverse seven-point method, etc.) Well layout methods, and have achieved good results. For small oil and gas reservoirs, due to their small size and irregular shape, usually only the irregular well pattern method can be used. There is no unified system definition for the irregular well pattern at present, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
Inventor 陈其荣刘柏林任熵费海虹
Owner CHINA PETROLEUM & CHEM CORP
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