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A drag-reducing method for surface modification of rock formations in low-permeability reservoirs

A surface modification and oil reservoir technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor economic benefits, short validity period, etc., and achieve favorable flow, excellent adsorption, and excellent hydrophobicity Effect

Active Publication Date: 2020-11-10
山东德坤工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the two technologies of surfactant and nano-injection generally have the problems of short validity period and poor economic benefit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Comparison of different indoor pretreatment methods on rock surface modification effects

[0044] The test temperature is 80°C,

[0045] The composition of the modifying fluid (by weight percentage): α-Al 2 o 3 (particle size 20-30nm) 0.1%, organic solvent (composed of benzene, xylene, cumene and 1,2-dibromoethane in a weight ratio of 1:1:2:1) 15%, surfactant (Sorbitan stearate and sodium dodecylbenzenesulfonate are composed in a weight ratio of 1:1) 1.5%, destabilizing agent (ammonium persulfate) 0.03%, and the balance is water.

[0046] Modified flow test on the rock surface without pretreatment: at the set temperature, 10PV (pore volume) of water flooding was simulated by using 1wt% ammonium chloride aqueous solution, and then 2PV was treated with the above-mentioned modified liquid (placed at an ambient temperature of 85 degrees. Stand still for 24hh). The results show that after the core is treated with rock surface modification materials, the water ...

Embodiment 2

[0049] Example 2: On-site rock surface modification construction in Well G15-1

[0050] Well G15-1 is located in Huadong Oilfield, and the average permeability of the reservoir in this well is 55.1×10 -3 um 2 , The porosity is 23.9%, which is a medium-porous low-permeability reservoir, and the screen position is 2969 meters. In May 2014, bet and transfer, with a daily allocation of 25m 3 , the initial water injection pressure was 12MPa, and the water injection pressure continued to rise. Before construction, the water injection pressure reached 23.6MPa, which is the same as the main line pressure, and the water injection volume is 5m 3 / d, if the injection cannot be achieved, take acidizing measures: after acidizing, the oil pressure of the well is 20MPa, and the injection rate is 9m 3 / d, basically the same as before acidification, indicating that the acidification measures are ineffective. In June 2016, the well reservoir was modified and drag-reduced according to the me...

Embodiment 3

[0067] Example 3: On-site rock surface modification construction in Well H158

[0068] Well H158 is located in Huadong Oilfield, the production well section is 2867.6-2898.4m, the oil layer thickness is 8.3m, and the screen pipe position is 2858m. The average permeability of the reservoir in this well is 4.51×10 -3 um 2 , Porosity 15.9%, belonging to low porosity, ultra-low permeability reservoir. Transferred in 2015, with a daily allocation of 40m 3 , the water injection pressure of the well before the measures was 20.2MPa, and the daily water injection volume was 26m 3 / d, not reaching injection, in October 2016, according to the method of the present invention, modification and drag reduction measures were carried out for the reservoir of the well.

[0069] Construction steps:

[0070] 1) Calculate the water absorption index of the formation to judge the water absorption capacity of the formation, and determine the displacement, pressure and other data during the extrus...

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Abstract

The invention discloses a low-permeability reservoir stratum surface modification drag reduction method. The method comprises the following steps: 1) performing pretreatment on low-permeability reservoir, comprising performing alkali liquor washing, acid liquor washing and clay swelling inhibition treatment on the low-permeability reservoir; 2) injecting modifying liquid and displacing liquid intoa low-permeability reservoir water injection well, after the injection is finished, closing the well and standing to enable a modifying material in the modifying liquid to be separated out at the surface of the low-permeability reservoir stratum, so as to complete the modification drag reduction to the surface of the low-permeability reservoir stratum. The modifying liquid is prepared from the following components in percentage by weight: 0.05 to 0.2% of nanoscale alpha-Al2O3, 10 to 20% of an organic solvent, 1 to 2% of a surface active agent, 0.005 to 0.01% of destabilizing agent and the balance of water; heating the modifying liquid to 40 to 45 DEG C, performing uniform stirring, then injecting the modifying liquid into the low-permeability reservoir water injection well. The method provided by the invention can effectively reduce the resistance to water injection, reduce the water injection pressure, and the valid period of the measures is long.

Description

technical field [0001] The invention relates to a drag reduction method for surface modification of oil reservoir rock formations, in particular to a drag reduction method for surface modification of low permeability oil reservoir rock formations. Background technique [0002] In recent years, with the reduction of conventional reserves, more and more low-permeability and ultra-low-permeability reserve units have been put into development. As an economical and effective technical means of reservoir development, water injection development is still the main method for the development of low-permeability and ultra-low-permeability reservoirs. Long-term water injection will cause surface contamination of rock formations in low-permeability reservoirs, resulting in clogging of reservoir seepage channels. According to statistics, PetroChina and Sinopec alone have more than 5,000 high-pressure under-injection wells in China, accounting for more than 12% of the wells opened. Due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/58
CPCC09K8/52C09K8/58C09K2208/12C09K2208/28
Inventor 杨付林张雪范勐
Owner 山东德坤工贸有限公司
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