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Temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of natural geothermal field

A geothermal and natural technology, applied in the field of temporary blocking and steering, can solve the problems such as difficult to achieve in-layer and in-seam steering, and cumbersome lifting tool technology

Active Publication Date: 2019-02-22
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical steering is only suitable for the plugging of specific layers, it is difficult to achieve intra-layer and intra-fracture steering, and mechanical steering cannot be used for wells with small distances between layers or perforation sections, and the process of lifting tools is cumbersome

Method used

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  • Temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of natural geothermal field
  • Temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of natural geothermal field
  • Temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of natural geothermal field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Taking the engineering transformation of Well M in H Oilfield as the implementation object, the temporary plugging diversion of liquid-solid-liquid phase transformation is realized by using the natural geothermal field.

[0078] Step 1: Well M is a horizontal well for gas injection and production, the lithology is carbonate rock, the horizontal section of the stimulation is 4718.96-5197.4m, and there are Type II / Type III fractured reservoirs (with fracture thickness of 95m). According to the characteristics of the reservoir, the stimulation method is determined to be four-stage acidizing (three fracturing) measures, and two-stage temporary plugging and diversion measures to seal the fractures in the formation.

[0079] Step 2: Calculate the turning plugging strength of the temporarily plugged reservoir, and calculate the minimum horizontal principal stress S h and the maximum horizontal principal stress S H , S H -S h = 4.8MPa, and the construction diversion plugging...

Embodiment 2

[0091] Taking the engineering transformation of Well L in H Oilfield as the implementation object, the temporary plugging diversion of liquid-solid-liquid phase transformation is realized by using the natural geothermal field.

[0092] Step 1: Well L is a pre-exploration well, the lithology is granite, the reformed intervals are 2504.10-2626.6m (122.20m), 2633.80-2729.8m (116.16m), the upper section is fractured granite, and the lower section is vug granite. According to the characteristics of the reservoir, the stimulation method is determined as 2-stage sand fracturing measures, 1-stage temporary plugging and diversion measures, plugging the cracks generated by the 1-stage fracturing, and opening the second stage, so as to realize the opening of two layers in one construction.

[0093] Step 2: Calculate the turning plugging strength of the temporarily plugged reservoir, and calculate the minimum horizontal principal stress S h and the maximum horizontal principal stress S H...

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Abstract

The invention discloses a temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of a natural geothermal field. The temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of the natural geothermal field comprises the steps that (1) the horizon of a reservoir needing temporary plugging is determined, and whether the reservoir needing temporary plugging is a crack or hole is determined; (2) the diversion plugging strength of the temporarily plugged reservoir is larger than or equal to the difference between the maximum principle stress and the minimum principal stress of the stratum is determined; (3) the plugging capacity of the horizon of the temporarily plugged reservoir and the crack or the hole are testedthrough flowing experiments of a core and the crack or pipe flow, and the use amount of a temporary plugging diversion system is worked out; (4) according to the distribution curve of the temperatureof liquid in an oil pipe in a shaft, the peak of bottom hole temperature is obtained; (5) an appropriate temporary plugging diversion system is determined; (6) the use amount of displacing liquid is determined, wherein the use amount of the displacing liquid is larger than or equal to the sum of the volume of the shaft and the volume of a liquid infusion pipeline; (7) site operation is organized.According to the temporary plugging diverting method for achieving liquid-solid-liquid phase conversion by means of the natural geothermal field, liquid is infused into the plugged reservoir, the plugged rack and the plugged hole to achieve effective plugging, liquid-solid-liquid change is achieved by means of the natural geothermal field, the requirements of the temporary plugging diversion technology are met, extra addition of gel breaker is not needed, and the application range is wide.

Description

technical field [0001] The invention relates to a temporary blocking and diverting technology in the production increase transformation of petroleum exploitation engineering, in particular to a temporary blocking and diverting method for realizing liquid-solid-liquid phase transformation by using a natural geothermal field, and belongs to the technical field of petroleum exploitation technology. Background technique [0002] In the process of exploration and development of oil and gas reservoirs, in order to increase the single well production of oil and gas reservoirs and maintain the normal daily production and operation of single wells, it is usually necessary to carry out various stimulation measures, mainly including pickling, acidizing, acid fracturing, sand fracturing and cleaning measures. [0003] The homogeneity of oil and gas reservoirs is relative, while the heterogeneity is absolute. Due to the heterogeneity of the reservoir, if the conventional acidification p...

Claims

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Application Information

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IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 赵立强张以明罗志峰余东合杜娟吴刚刘平礼刘国华李年银李拥军徐昆张楠林陈祥
Owner PETROCHINA CO LTD
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