A fracturing stimulation method

A technology for fracturing pipe strings and old fractures, which is used in earth-moving drilling, production of fluids, wellbore/well components, etc. It can solve the problems of complex oil-water relationship, water breakthrough or water production in infill wells, etc., and improve reservoir recovery. rate, increase the volume of reformation, and increase the effect of recoverable reserves

Active Publication Date: 2017-07-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing methods for realizing enhanced recovery in low-permeability old oilfields mainly have the following problems: re-arranging infill wells on the basis of old well patterns, changing the form and specifications of old well patterns, and at the same time, as the oilfield enters the middle and late stages of development, oil-water The relationship is complicated, and there is a risk of water breakthrough or water production in infill wells

Method used

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  • A fracturing stimulation method

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Effect test

Embodiment 1

[0022] A fracturing stimulation method, comprising the steps of:

[0023] Step 1: Run the fracturing string 1 into the formation where the old fracture is located, and perform hydraulic fracturing on the perforated section of the formation to open the old fracture;

[0024] Step 2: Use proppant, sand plug, and temporary plugging agent to shield and temporarily plug old fractures to form main fractures and branch fractures; add proppant, sand plug, and temporary plugging agent to the old fractures according to the mass fraction ratio of 5: The mixture composed of 2:1 can shield and temporarily plug the old cracks, and press the old cracks to form main cracks and branch cracks;

[0025] Step 3, throwing a ball to knock down the sliding sleeve restrictor 3 on the fracturing string 1;

[0026] Step 4, use slick water to carry proppant to support the branch fractures, base fluid and cross-linking fluid respectively carry proppant to support the main fractures; add the mixture of p...

Embodiment 2

[0034] On the basis of Example 1, specifically, the particle size of the proppant in step 2 is 8 mesh to 16 mesh, the temporary plugging agent is CDD-3 oil-soluble fracture temporary plugging agent, the particle size is 3mm~6mm, and the CDD -3 The density of the oil-soluble fracture temporary plugging agent is 1.30±0.20g / cm 3 , Softening temperature: ≥30°C, dissolution time (40°C): <90min.

[0035]Before implementing this fracturing stimulation method, it is necessary to pull out the production string of the original well and clean it, and then use the drilling gauge to drill the well, that is, use the drilling gauge to drill the well to the artificial well bottom of the operating well to ensure that the The wellbore of the operating well is clean. In this way, check whether the inner diameter of the operating well meets the standard through the well gauge. If the operating well is deformed or blocked, check the maximum geometric dimension that the deformed or blocked operatin...

Embodiment 3

[0042] On the basis of Example 2, it should be noted that the particle size of the proppant carried by the slick water in step 4 is 40 mesh to 70 mesh, and the particle size of the proppant carried by the base fluid and crosslinking liquid is 20 mesh to 40 mesh. head.

[0043] Before implementing this fracturing stimulation method, it is necessary to pull out the production string of the original well and clean it, and then use the drilling gauge to drill the well, that is, use the drilling gauge to drill the well to the artificial well bottom of the operating well to ensure that the The wellbore of the operating well is clean. In this way, check whether the inner diameter of the operating well meets the standard through the well gauge. If the operating well is deformed or blocked, check the maximum geometric dimension that the deformed or blocked operating well can pass through. If the size does not meet the fracturing requirements, the well should be repaired first and then ...

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Abstract

The invention provides a fracturing stimulation method. The fracturing stimulation method comprises the following steps that 1, a fracturing string is put in a stratum where an old crack is located, and hydraulic fracturing is carried out on a perforation section of the stratum to open the old crack; 2, the old crack is shielded and temporarily blocked through propping agents, a sand compartment and temporary blocking agents, and a main crack and branch cracks are formed; 3, a ball is thrown to knock out a sliding sleeve flow controller on the fracturing string; 4, quick water carries propping agents to support the branch cracks, and base fluid and crosslinked fluid carry propping agents respectively to support the main crack. The fracturing stimulation method particularly replaces an infill well to improve the recovery ratio of a maturing field, use and potential tapping of lateral remaining oil of the old crack are achieved, the recoverable reserve is increased, the modification size of the stratum is also increased, and the stratum recovery ratio of the maturing field is improved.

Description

technical field [0001] The invention belongs to the technical field of oil recovery engineering, and in particular relates to a fracturing stimulation method for substituting infill wells to improve the recovery rate of old oilfields. Background technique [0002] In recent years, with the advancement of fracturing technology, a large number of low-permeability reservoirs and tight reservoirs in China have been effectively developed. Affected by factors, a large amount of remaining oil around the old artificial fractures was produced, but the remaining oil in the lateral direction of the fractures was difficult to produce, resulting in a decline in the single-well production of oil wells, and a large amount of remaining oil remained in the reservoir. [0003] At present, domestic and foreign methods of producing remaining oil in reservoirs are mainly through the monitoring of remaining oil in reservoirs and the results of numerical simulation analysis, on the basis of old we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B33/13
CPCE21B33/13E21B43/267
Inventor 达引朋慕立俊赵振峰李宪文卜向前庞鹏李向平李转红吕宝强苏良银刘兴银杜春龙唐思睿郭亮马红星
Owner PETROCHINA CO LTD
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