Non-filling self-adapting sand prevention technology method

A process method and self-adaptive technology, applied in chemical instruments and methods, earth-moving drilling, and fluid production, etc., can solve the problems of small construction displacement, aggravated oil well sand production, increased viscosity and sand-carrying capacity, etc., reducing equipment The effect of covering area, preventing formation sand migration, and improving completion reliability

Active Publication Date: 2020-08-25
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, sand filter tubes are generally used in conjunction with conventional circulation filling, extrusion filling and other technical measures to treat oil wells. However, due to the limitation of single gravel size in the sand control layer, construction displacement and relatively small sand ratio, the effective period of sand control is still short after the measures are put into production. and serious loss of liquid production, etc., seriously restricting the efficient development of this type of reservoir
At the same time, deepwater sand control operations are facing severe challenges, and the weight of sand control operation costs in the production costs of a well is also increasing
[0003] At present, single-size gravel is used for filling sand control in polymer injection flooding wells in unconsolidated sandstone reservoirs. The main problems are as follows: (1) The viscosity of the fluid produced in the accumulation well increases and the sand-carrying capacity is enhanced. Sand production shortens the effective period of oil well sand control; (2) Due to the lack of pertinence in the sand control technical measures adopted, some oil wells have a low liquid volume after sand control, which cannot achieve the purpose of liquid extraction; The joint action of formation particles and other factors lead to clogging of formations and sand barriers, resulting in a sharp drop in fluid production in some oil wells, affecting the effect of polymer injection production

Method used

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  • Non-filling self-adapting sand prevention technology method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A filling-free self-adaptive sand control process method, comprising the following steps:

[0041] Step 1. Determine the structural size of the three-stage expansion sand control net of the self-adaptive expansion sand control string according to the analysis of reservoir physical properties, geological structure, and reservoir sand particle size, that is, the mesh size of the expansion sand control net in the sand retaining layer is the formation sand grain size The value is 3 to 4 times; in the stable sand layer, the mesh size of the expansion sand control net is 4 to 5 times the median value of the formation sand grain size; The value is 5 to 6 times.

[0042] Step 2, use pre-fluid to treat the wellbore, and use the well drilling standard to carry out the well drilling operation;

[0043] Step 3: wash the sand first, then lower the construction pipe string, use organic solvent to wash the heavy organic precipitate precipitated in the formation, use surfactant to red...

Embodiment 2

[0046] The step 3 in the above-mentioned embodiment 1 further includes:

[0047] 1) Select a sand producing well with good liquid supply capacity and permeability, and flush the sand to the position required by the design;

[0048] 2) Lower the construction string according to the design requirements;

[0049] 3. For sand production wells with crude oil viscosity > 1500mPa.s, water content < 80% or long-term polymer injection, the oil layer must be pretreated before sand control, including using organic solvents to wash the heavy organic precipitates precipitated in the formation, and using surfactants to reduce Oil-water interfacial tension, adding penetrant to enhance the permeability of the reservoir;

[0050] 4) For resin-type sand consolidation agents, the squeeze pressure should be lower than the fracture pressure of the formation, and if the oil layer is blocked, it must be unblocked first;

[0051] 5) Squeeze the resin-type sand-consolidating agent to make the low-mo...

Embodiment 3

[0057] The sand control process method includes:

[0058] Step 1: Determine the structural size of the three-stage expansion sand control net of the self-adaptive expansion sand control string according to the analysis of reservoir physical properties, geological structure, and reservoir sand particle size. times, this layer is the sand-retaining layer; in the middle layer, the sand-retaining transition layer, the mesh size of the expansion sand control net is 4 to 5 times the median value of the formation sand, which is the sand stabilization layer; the inner layer is the expansion control layer in the annulus of the screen casing. The mesh size of the sand mesh is 5 to 6 times the median value of the sand grain size of the formation, that is, the sand discharge layer.

[0059] In step 2, the wellbore is treated with prefluid, and the drilling operation is carried out according to the drilling specification.

[0060] Step 3: wash the sand first, and then lower the constructi...

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Abstract

The invention provides a non-filling self-adapting sand prevention technology method. The non-filling self-adapting sand prevention technology method comprises the following steps of step1 according to data including oil reservoir physical properties, geological structures, reservoir sand granularmetric analysis, numerical simulation and the like, performing technology parameter optimizing; step 2, processing a wellhole for drafting; step 3, performing sand fixing with high-infiltration resins: firstly, washing the sand to a position according to design requirements, arranging a construction pipe column according to design requirements, performing preprocessing on the oil layer, then selecting a high-infiltration resin type sand fixing dose, extruding the resin type sand fixing dose and replacement liquid, after pressure is naturally proliferated, slowly raising the construction pipe column for coagulation; and step 4, arranging a self-adapting sand prevention inflation sand preventionpipe column. The non-filling self-adapting sand prevention technology method disclosed by the invention has the main advantages that a filling operation is not needed, so that the construction technology is simplified, the cost is low, and no risk is generated; the quick sand is fixed by the high-infiltration resins, and the fluid naturally passes, so that sand is prevented, and oil is not prevented; and self-adapting classified expanding materials allow sand of which the diameter is less than 40 microns to pass, and preferable sand prevention is really performed through sand passing.

Description

technical field [0001] The invention relates to the fields of oil and gas fields and natural gas hydrate development, in particular to a filling-free self-adaptive sand control process method. Background technique [0002] Unconsolidated sandstone heavy oil reservoirs and natural gas hydrate reservoirs are limited by the physical and fluid properties of the reservoirs. Such reservoirs usually have problems such as low liquid volume, high water cut and severe sand production during the development process. At present, sand filter tubes are generally used in conjunction with conventional circulation filling, extrusion filling and other technical measures to treat oil wells. However, due to the limitation of single gravel size in the sand control layer, construction displacement and relatively small sand ratio, the effective period of sand control is still short after the measures are put into production. Problems such as serious loss of fluid production and other problems seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/10E21B43/08E21B33/13E21B21/00C09K8/575
CPCE21B43/103E21B43/108E21B33/13E21B21/00C09K8/5755
Inventor 张磊杨海波张建国齐志刚李国锋马明新陈阳邹晓敏邵茹赵勇
Owner CHINA PETROCHEMICAL CORP
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