Prediction method of sand and water production profile in horizontal well and optimal design method of sand control and water control screen

Abstract

The invention relates to the technical field of screen tube sand control and well completion in oil and gas exploitation, in particular to a method for predicting sand and water production profiles of horizontal wells and an optimal design method for sand control and water control screen tubes. According to the easily obtained resistivity logging data, natural potential logging data, natural gamma ray logging data and acoustic time difference logging data, the present invention comprehensively considers the synergistic relationship between formation sand and water production, and identifies the heterogeneous production intervals. The location and area length of high-speed inflow and sand production clearly define the key design target locations for sand control and water control operations, solve the blindness of general sand control and water control in horizontal wells, and improve economic benefits. The method is simple and easy to implement, and the results are reliable.

Description

technical field [0001] The invention relates to the technical field of screen tube sand control and well completion in oil and gas exploitation, in particular to a method for predicting sand and water production profiles of horizontal wells and an optimal design method for sand control and water control screen tubes. Background technique [0002] With the development of oil exploration and development technology, the use of horizontal well technology to develop oil and gas fields has become an effective technical means to improve oil recovery and single well production, exploit remaining oil, and reduce the cost per ton of oil. Horizontal wells increase the contact area between the wellbore and the reservoir, and can better develop thin oil layers or reservoirs with large vertical permeability, and play an increasingly important role in the exploitation of oil and gas resources. [0003] Water and sand production of horizontal wells in unconsolidated sandstone reservoirs are...

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Problems solved by technology

[0003] Water production and sand production of horizontal wells in unconsolidated sandstone reservoirs are two thorny issues. After water breakthrough in horizontal wells, the entire wellbore will be flooded in a short period of time, seriously reducing the production efficiency of horizontal wells.

At the same time, the ground stress in the high-speed water outlet area of ​​the horizontal well is weak, and the fine sand and gravel in the formation are easy to peel off under the action of fluid erosion and shearing, and are carried by the formation fluid into the wellbore of the production layer of the horizontal well, causing wellbore blockage and equipment damage

[0004] The current problems in the field of sand control and water control of horizontal wells include: (1) The water and sand production profiles of horizontal wells with long production intervals are heterogeneous, and it is difficult to obtain a large amount of water and sand production positions accurately. Targeted sand control and water control construction in severe layers can only use general techniques for the entire layer, and it is difficult to achieve ideal comprehensive sand control and water control effects; The water and sand production problems of horizontal wells in long intervals and the research on water control and sand control technologies are basically in a divide-and-conquer situation, and sand and water control lacks purpose, and general control measures for the entire interval increase seepage resistance, energy consumption, and operating production costs

Existing problems include: (1) Lack of specially designed integrated sand control and water control screens; (2) Insufficient flexibility and replaceability of internal parts of screens; (3) Most of the earlier sand control and water control integrated screens The water control part of the chemical screen adopts ICD water control technology, which is not self-adaptive; (4) Water control parameters are separated from sand control optimization, and there is a lack of comprehensive optimization design for sand control and water control parameters

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