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A decision-making method for profile control of negative pressure water injection wells in oilfields

A decision-making method, water injection well technology, applied in earthwork drilling, borehole/well components, measurement, etc.

Active Publication Date: 2017-03-22
山东石大油田技术服务股份有限公司
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Problems solved by technology

[0003] The present invention provides a decision-making method for profile control of negative-pressure water injection wells in oilfields on the basis of existing wellhead pressure index decision-making, so as to solve the problems related to profile control when the oil pressure of water injection wells is negative pressure

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  • A decision-making method for profile control of negative pressure water injection wells in oilfields
  • A decision-making method for profile control of negative pressure water injection wells in oilfields

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Embodiment Construction

[0009] The Karazhanbas Oilfield in the Republic of Kazakhstan (Karazhanbas Oilfield, referred to as KBM) is located on the Buzachi Peninsula on the east coast of the Caspian Sea in the west of Kazakhstan. It is a high-porosity, medium-high permeability heavy oil reservoir. The viscosity of underground crude oil is 240-340mpa.s. The oil layer has good physical properties, and the permeability is 800×10 -3 μm 2 , with a porosity of 30.7%; due to the development of steam injection for more than 20 years, the oil layer structure was destroyed, and the tracer test showed that the channeling velocity of injected water was as high as 2000m / d (converted). The underground deficit is large, and the oil pressure of water injection wells is negative. In May 2013, 5 wells (443, 420, 418, 417, and 367) were selected for profile control. The status of water injection before construction is shown in Table 1.

[0010] Table 1. Water injection situation of profile control wells in KBM Oilfiel...

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Abstract

The invention discloses a decision method used for profile control of an oil-field water injection well. The technical scheme is that the decision method comprises the following steps: (1) firstly testing the vacuum value of the wellhead oil pressure of the water injection well under the injection allocation condition by adopting a vacuum meter when the wellhead oil pressure of the water injection well is a negative value during a testing process; then, suddenly shutting down the well, and recording changes of wellhead vacuum with time; (2) converting the tested vacuum into absolute pressure; then, drawing a wellhead falloff curve of the water injection well by adopting the absolute pressure as a Y-axis and the time as an X-axis, and then, performing calculation and application according to the PI (pressure index) decision method. According to the decision method disclosed by the invention, decision aiming at when the wellhead oil pressure of the water injection well is the negative value is the supplement and improvement of wellhead PI decision; the calculation is performed by converting the vacuum into the absolute pressure value during wellhead PI decision testing of the absolute pressure in comparison with the decision made by adopting gage pressure in general, and therefore, the decision problem generated when the water injection well is negative in pressure is solved.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a decision-making method for formulating, implementing and evaluating the effect of a profile control scheme for a water injection development oil field. Background technique [0002] In oil and gas field development, profile control technology is one of the important means to enhance oil recovery. Profile control technology includes decision-making technology, plugging agent technology, injection technology and evaluation technology. Among them, the profile control decision has RE, RS, PI There are several main decision-making techniques, the most widely used is P.I. The (pressure index) decision-making technology is the wellhead pressure index decision-making technology, which is based on the wellhead pressure drop curve of the water injection well P.I. The value is the technique of decision-making parameter of block overall profile control. P.I. The value is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
Inventor 温鸿滨叶卫保马中跃赵福麟
Owner 山东石大油田技术服务股份有限公司
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