Modified composite containing cavity sand control well completion screen pipe with flow dividing function

A diversion and modification technology, applied in the fields of production fluids, wellbore/well components, earthwork drilling, etc., can solve the problem of inability to adapt to the geological and production conditions of natural gas hydrate argillaceous silty sand reservoirs, filling materials and filling The problems of single particle size and large intrusion and blocking range of formation sand can achieve the effect of taking into account the sand retaining performance, improving the validity period of sand control, and reducing the degree of blocking.

Pending Publication Date: 2022-01-21
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) The pre-filled particles are fixedly filled by slotting or wire-wrapped media, which have poor erosion resistance under complex flow conditions in natural gas hydrate reservoirs, are prone to erosion damage, and have a short effective period of sand control;
[0008] 2) The filling material and filling particle size are single, the formation sand intrusion and clogging range is large, and the overall clogging is serious;
[0009] 3) Prepacking gravel size design and material selection cannot adapt to the geological and production conditions of natural gas hydrate muddy silt fine sand reservoirs

Method used

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  • Modified composite containing cavity sand control well completion screen pipe with flow dividing function
  • Modified composite containing cavity sand control well completion screen pipe with flow dividing function
  • Modified composite containing cavity sand control well completion screen pipe with flow dividing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A modified compound cavity sand control completion screen with diverting effect, the structure is as follows figure 1 , figure 2 as shown,

[0048] The sand control completion screen includes from the inside to the outside in sequence:

[0049] A base pipe 1, the base pipe 1 is provided with several diversion holes 2 communicating with the interior of the base pipe; the diversion holes 2 are circular with a diameter of 8-10mm. The base pipe is a central pipe with holes, and its main function is to ensure the overall strength of the screen pipe, support the pre-fill layer, and ensure fluid inflow;

[0050] The inner filter screen 3 set outside the base pipe; the material of the inner filter screen 3 is 316L, which is sintered by five layers of metal screens, the thickness is about 1.5-2.5mm, and the nominal accuracy is the second pre-filled layer of ceramsite 2 / 3 of the smallest particle size.

[0051] The outer filter 6 set outside the base pipe; the material of th...

Embodiment 2

[0056] It is the same as the modified composite cavity sand control completion screen described in Example 1, the difference is that:

[0057] Both the first pre-fill layer 4 and the second pre-fill layer 8 have a thickness of 50mm, the first pre-fill layer 4GSR is 14mm, and the second pre-fill layer GSR is 11mm.

experiment example

[0065] Experimental example: Sand retaining and plugging effect test

[0066] Test method: use the sand control performance evaluation experimental device of the gravel layer, and then simulate the gas-water flow conditions in the process of natural gas hydrate exploitation, and use muddy silty sand to carry out the sand blocking simulation experiment of the gravel layer. During the experiment, by controlling variables to ensure that all experimental flows and formation sand conditions are consistent, ceramsite with a specified particle size is pre-filled in the radial flow displacement experimental device according to the specified method; at the beginning of the experiment, first mix the fluid with water and air Flood the gravel pack for a period of time, then use fluid to carry muddy silt and fine sand to displace the gravel pack for a long time, measure the pressure difference and fluid flow on both sides of the gravel pack; then change the gravel pack mode or size to maint...

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Abstract

The invention relates to a modified composite containing cavity sand control well completion screen pipe with a flow dividing function. The sand control well completion screen pipe sequentially comprises a base pipe, an inner layer filter screen, an outer layer filter screen, a modified multi-size-fraction pre-filling layer and an outer covering protective cover from inside to outside. The inner layer filter screen is arranged outside the base pipe in a sleeving mode. The outer layer filter screen is arranged outside the base pipe in the sleeving mode; the modified multi-size-fraction pre-filling layer is arranged between the inner layer filter screen and the outer layer filter screen; the outer covering protective cover sleeves the outer side of the outer layer filter screen; and the modified multi-size-fraction pre-filling layer comprises a first pre-filling layer and a second pre-filling layer, the first pre-filling layer and the second pre-filling layer are arranged in a spaced and staggered mode in the axial direction of the base pipe, the first pre-filling layer and the second pre-filling layer are filled with ceramsite, and the grain sizes of the ceramsite in the two pre-filling layers are different. According to the screen pipe, gas and a solid-liquid mixture are effectively shunted in the inflow process, the gas circulation performance is guaranteed to a large extent, meanwhile, the sand blocking performance is considered, excessive blocking is avoided, and the high permeability is achieved. High sand blocking performance and high circulation performance are both considered, the stability of the pre-filling layer is high, and the service life of the sand control well completion screen pipe is long.

Description

technical field [0001] The invention relates to a modified composite cavity sand control well completion screen with diverting effect, which belongs to the technical field of oil and natural gas and natural gas hydrate downhole drilling and production tools. Background technique [0002] Natural gas hydrate has the characteristics of high energy density, low combustion pollution, and abundant reserves on a global scale. It has great potential for development. At present, the trial production of natural gas hydrate has been carried out in the Mallik mine in Canada and the Alaska land area in the United States. Various degrees of sand production problems have occurred in all of the wells, resulting in serious clogging of the downhole sand control media and reduced overall production capacity, seriously affecting the test production process. [0003] If the formation sand carried by the fluid enters the sand-retaining medium, the intruded formation sand inside the sand-retainin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/08
CPCE21B43/082
Inventor 董长银周玉刚徐鸿志王宇宾樊明武宋洋王力智孙宝江高永海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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