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A multi-stage fracturing horizontal well tracer method for finding water

A horizontal well and tracer technology, which is applied in construction and other fields, can solve the problems of high technical cost, complicated construction, and long cycle time, and achieve the effects of improving accuracy and efficiency, simple operation, and short cycle time

Active Publication Date: 2019-10-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of high cost, low efficiency, long period and complicated construction of the existing horizontal well water finding technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a multistage fracturing horizontal well tracing method for finding water, including the following steps:

[0029] Step 1: Screen the tracer according to the well conditions of the horizontal well;

[0030] Step 2: run the screened tracer into the well along with the oil casing, and perform horizontal well production test;

[0031] Step 3: Open the well for production testing, take wellhead liquid samples, classify, purify, analyze and process the indicator of the produced fluid, and understand the water output of each section through the change of the concentration of the tracer.

[0032] Aiming at the problems of high cost, low efficiency, long period and complex construction of the current horizontal well water finding technology, the present invention proposes this multi-stage fracturing horizontal well tracer water finding technology, which does not rely on downhole testing instruments and uses a tracer The surface test of the produced liqu...

Embodiment 2

[0035] This embodiment specifically refines the steps in the above-mentioned embodiment 1, wherein,

[0036] Screening tracers in step 1 includes the following processes:

[0037] (1) According to the data of lithology, oiliness, reservoir temperature, pressure, well completion type and number of fracturing stages, a suitable tracer is initially selected;

[0038] (2) Conduct temporary plugging performance tests, conduct comparative analysis of oilfield tracers, and screen the primary tracers in (1) above. It is required that there are many types of tracers in the same system, harmless and stable physical and chemical properties, and put into laboratory operations It is simple, and the sustained release rate is controllable. This is an existing method, and no special description is made here.

[0039] The basis of the screening step in this embodiment is based on operating experience, and the staff can completely select a suitable tracer based on experience based on lithology...

Embodiment 3

[0051] For the contents of the above two embodiments, the present embodiment provides the specific process of the multi-stage fracturing horizontal well tracing method for finding water of the present invention, and the process is specifically as follows:

[0052] (1) Preliminary selection of suitable tracers based on data such as lithology, oiliness, reservoir temperature, pressure, well completion type, number of fracturing stages, etc.;

[0053] (2) To screen through the comparative analysis of oilfield tracers, which require the characteristics of many types of tracers in the same system, harmless and stable physical and chemical properties, simple and convenient operation for testing, and controllable slow-release speed;

[0054] (3) According to the specific requirements of test temperature, pressure, number of segments, etc., make tracer slow-release patches / blocks for backup;

[0055] (4) Process the sub-joints of the support tubes that can place tracer slow-release pa...

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Abstract

The invention belongs to the technical field of multi-segment fractured horizontal well tracing and water finding and particularly relates to a multi-segment fractured horizontal well tracing and water finding method. The method comprises the following steps: according to a well condition of a horizontal well, screening a tracing agent; enabling the screened tracing agent to enter the well along an oil sleeve and carrying out a horizontal well production test; carrying out a well opening production test and taking a wellhead liquid sample; classifying, purifying, analyzing and treating a produced liquid indication agent; and learning the water outlet condition of each segment through the change of concentrations of the tracing agent. According to the multi-segment fractured horizontal well tracing and water finding method, a water production condition of each section is analyzed through a produced liquid ground test with the tracing agent, and a simple tubular column and simplified operation of a horizontal well water finding technology are realized; and the method has the characteristics of rapidness and high efficiency and the horizontal well water finding precision and efficiency are improved. In a utilization process of the water finding method, normal production is not influenced and a result can be obtained by testing after sampling; and a plurality of segments can be tested at the same time, the period is short and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of finding water in multi-stage fracturing horizontal wells, and in particular relates to a method for tracing water in multi-stage fracturing horizontal wells. Background technique [0002] Low-permeability, ultra-low-permeability and other unconventional oil and gas resources are important energy replacement reserves in my country. This type of reservoir has the characteristics of low porosity and low permeability, with low natural productivity and poor production stability conditions. Sand fracturing. In recent years, the multi-stage fracturing technology of horizontal wells has advanced by leaps and bounds, and has become a key technology for the effective development of this type of oilfield, and has been widely used in various low-permeability oilfields in my country. [0003] As we all know, water injection is an important measure to replenish formation energy and improve oil recovery, and it is no ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/11
CPCE21B47/11
Inventor 许洪星孙虎王祖文张冕池晓明廖乐军高红平李燕红陶长州刘欢杨燕郭艳萍纪冬冬
Owner BC P INC CHINA NAT PETROLEUM CORP