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High-water-content horizontal well tracer injection water exploration process and string

A process method and tracer technology, applied in construction and other directions, to achieve the effects of good fluid compatibility, easy detection and high sensitivity

Inactive Publication Date: 2016-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, there is no method of injecting tracers in oil wells to judge the water-producing intervals of high water-cut horizontal wells

Method used

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  • High-water-content horizontal well tracer injection water exploration process and string

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Embodiment 1

[0034] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0035] A kind of high water-cut horizontal well injection tracer water-seeking process method of the present invention, it comprises the following steps:

[0036] A. Determine the tracer according to the fluid properties of the tested well, and screen out tracers with different characteristics and incompatible with each other according to the number of test sections of the tested well;

[0037] Among them, it is necessary to screen out tracers with good fluid compatibility, good chemical and biological stability, easy detection, and high sensitivity. The determination of tracers belongs to common common knowledge in the construction process in this field and will not be des...

Embodiment 2

[0058] In this embodiment, a five-stage horizontal well is taken as an example.

[0059] 1. According to the fluid properties of the tested well, through compatibility experiments, five tracers A1, A2, A3, A4, and A5 that do not interfere with each other are screened;

[0060] 2. According to the situation of oil well formation production fluid, determine the amount of injected formation tracer solution as m1, m2, m3, m4, m5 respectively. Then mix the five tracers with the aqueous solution containing 15,000 mg / L of salt at a volume ratio of 1:5, and stir them on the ground to make them evenly mixed;

[0061] 3. Inject different tracers into each section of the tested well sequentially through the double-sealed single-card string, including the following steps,

[0062](1) Lower the double-sealed single-sealed pipe string into the first sealing interval at the bottom of the horizontal well;

[0063] (2) The first sealing interval is sealed by double packers with double-sealin...

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Abstract

The invention belongs to the technical field of oil production of oil fields, and particularly relates to a high-water-content horizontal well tracer injection water exploration process and a string. The process includes: determining tracers according to fluid properties of a tested well, and screening out the tracers different in characteristics and mutually incompatible according to the number of test segments of the tested well; respectively calculating consumptions of different tracers injected into the formation; sequentially injecting the different tracers into all the intervals through a dual-seal single-clamp string, pulling out the injection string after all the intervals are injected; lowering down a production string, lifting formation fluid to the ground, sampling and testing on the ground, detecting the content and concentration of the different tracers in output liquid, and judging a water production interval according to the detected structure.

Description

technical field [0001] The invention belongs to the technical field of oil recovery in oilfields, in particular to a water-seeking process method and a pipe string for injecting a tracer into a high-water-cut horizontal well. Background technique [0002] Water production from oil wells is a common problem in oilfield development, especially for water flooding (water injection wells, edge water and bottom water) oilfields. Inhomogeneous oilfields lead to premature flooding of the oilfield and reduced recovery of the oilfield. High water-cut horizontal wells greatly affect the productivity of oil wells. To control high water-cut horizontal wells, it is necessary to accurately determine the water-producing intervals. At present, the representative methods for water-seeking in horizontal wells mainly include water-seeking by liquid production profile logging, water-finding by neutron oxygen activation test, and water-finding by segmental production test. The liquid production...

Claims

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Application Information

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IPC IPC(8): E21B47/11
CPCE21B47/11
Inventor 罗有刚甘庆明吕亿明王百牛彩云李亚洲朱洪征崔文昊常莉静
Owner PETROCHINA CO LTD
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