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Decision method used for profile control of oil-field water injection well

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

Active Publication Date: 2014-06-18
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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  • Decision method used for profile control of oil-field water injection well
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Embodiment Construction

[0009] The Karazhanbas Oilfield (KBM) in the Republic of Kazakhstan 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- and high-permeability heavy oil reservoir. The viscosity of underground crude oil is 240~340mpa.s. Good oil layer physical properties, permeability 800×10 -3 μm 2 , Porosity 30.7%; due to the development of steam injection for more than 20 years, the oil layer structure was destroyed, tracer test, the flow rate of injected water was as high as 2000m / d (converted). The underground deficit is large, and the oil pressures of the water injection wells are all negative. In May 2013, 5 wells (443, 420, 418, 417, 367) were screened for profile control. The status of water injection before construction is shown in Table 1.

[0010] Table 1 KBM oilfield profile control well water injection situation table

[0011] HashtagWith injection m 3 Real note m 3 Water injection oil pressure MPa Va...

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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, and specifically is a decision-making method for the formulation, implementation and effect evaluation of profile control schemes for water injection development oil fields. Background technique [0002] In the development of oil and gas fields, profile control technology is one of the important means to improve oil recovery. Profile control technology includes decision-making technology, plugging agent technology, injection technology and evaluation technology. Among them, the profile control decisions are RE, RS, PI Several major decision-making techniques, the most widely used is PI (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, and PI The value is the technology of the block overall profile control decision parameter. PI The value is calculated from...

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Application Information

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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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