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Sand-preventing method of artificial borehole wall, and material for sand prevention

A technology of artificial borehole walls and materials, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of oil and gas well production decline, short sand control period, and reduce permeability, etc., to reduce friction Resist, improve sand control effect, improve the effect of permeability

Active Publication Date: 2017-09-15
东营市科诺石油技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of chemical sand control: the injection agent has uneven cementation and aging, which leads to a short sand control period; seriously damages the reservoir and reduces permeability, and the output of oil and gas wells decreases after sand control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Well Zhuangqian 12K in Liuguanzhuang Oilfield

[0052] (1) Situation description: The structural location is the north fault nose of Well Zhuangqian 2 in the Yangerzhuang nose-shaped structural belt of the Huanghua Depression. The date is 2014-10-11. The completed drilling depth is 1655m, and the artificial well bottom is 1650m.

[0053] (2) There are problems

[0054] The well was self-blowing for one year, and then turned to pumping for one month to produce sand, and the well-washing leakage was serious, indicating that the oil layer of the well was short.

[0055] (3) Sand control process

[0056] Preparation of materials

[0057] The guide fluid includes the following components by weight: 2.5% sodium chloride, 1% calcium chloride, 0.5% magnesium chloride, 0.2% dinonylphenol polyoxyethylene ether, N-oleoyl-N-methyl The mass concentration of sodium taurine is 0.3%, the mass concentration of dimethyldiallylammonium chloride-acrylamide copolymer is 0.5%, and the b...

Embodiment 2

[0078] Well Zhao 41-23X in fault block Zhao 108 in Huabei Oilfield

[0079] (1) Situation description: The structural location is Zhao 108 fault block, the completed drilling depth is 1878m, and the original artificial well bottom is 1866m.

[0080] (2) There are problems

[0081] The well has serious sand production, and well washing leakage, indicating that the oil layer of the well is short.

[0082] (3) Sand control process

[0083] Preparation of materials

[0084] The guide fluid includes the following components by weight: 2.5% sodium chloride, 1% calcium chloride, 0.5% magnesium chloride, 0.5% polyoxyethylene dinonylphenol, N-oleoyl-N-methyl bovine The mass concentration of sodium sulfonate is 0.6%, the mass concentration of dimethyl diallyl ammonium chloride-acrylamide copolymer is 1.5%, and the balance is water.

[0085] The sand-carrying liquid includes the following components in terms of weight content: dimethyl diallyl ammonium chloride-acrylamide copolymer 5...

Embodiment 3

[0105] Well A44h in CNOOC JX1-1 Oilfield

[0106] (1) Description of the situation:

[0107] Well A44h is a horizontal well, producing oil group II of the second member of the Shahejie Formation and oil group I of the third member of the Shahejie Formation. The 5-1 / 2″ bridge-type composite screen was completed. The effective oil layer thickness in the screen section was 127.6m, and the drilling depth was 1941m.

[0108] (2) There are problems

[0109] The screen is broken. When the well was completed, a 5 1 / 2" outer bridge high-quality screen was used for sand control. The sand samples taken during the pump inspection operation were tested and found to be formation sand with a particle size of 214um. Therefore, it is judged that the sand control screen of this well has been damaged. .

[0110] (3) Sand control process

[0111] The guide fluid includes the following components by weight: 0.5% sodium chloride, 1% calcium chloride, 0.5% magnesium chloride, 3.5% dinonylphenol ...

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Abstract

The invention discloses a sand-preventing method of an artificial borehole wall, and a material for sand prevention. The material for sand prevention comprises guide liquid, sand carrying liquid and promoting liquid which are prepared separately, wherein the guide liquid comprises the following components in percentage by weight: 0.5 to 20 percent of sodium chloride, 0.2 to 2 percent of calcium chloride, 0.1 to 1 percent of magnesium chloride, 0.2 to 4 percent of alkylphenol polyoxyethylene, 0.3 to 8 percent of an anionic surfactant capable of resisting calcium and magnesium ions and 0.01 to 6 percent of a dimethyl diallyl ammonium chloride-acrylamide-acrylic acid copolymer; the sand carrying liquid comprises the following components in percentage by weight: 0.01 to 5 percent of a dimethyl diallyl ammonium chloride-acrylamide copolymer and 0.5 to 20 percent of ammonium chloride; and the promoting liquid comprises the following components in percentage by weight: 8 to 22 percent of a penetrating agent and 18 to 35 percent of a dehydroxylation catalyst. The material for sand prevention performs sand prevention, can protect the stratum, has high sand carrying capability, reduces friction and enhances the consolidation strength, and the penetration ratio of the artificial borehole wall formed after sand prevention is more than 12 <mu>m<2>.

Description

technical field [0001] The invention relates to a sand control method for an artificial shaft wall and a sand control material thereof. Background technique [0002] During the exploitation of oil and gas fields, formation sand production is a common problem, especially in the production of unconsolidated oil and gas formations, sand production is unavoidable in mixed oil and gas wells or mixed water injection wells. Sand production in oil wells will cause abrasion and damage to production equipment, reduce oil well production, and increase production costs. In severe cases, it will also cause problems such as stratum collapse, caprock subsidence, casing deformation, and misalignment, which will make the oil well scrapped. [0003] At present, there are mainly two kinds of sand control methods for oil and gas wells at home and abroad: mechanical sand control and chemical sand control. Mechanical sand control is mainly to hang slotted liners, wire-wrapped screens, double-lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575E21B43/02
CPCC09K8/5753C09K8/5755C09K2208/28E21B43/025
Inventor 王立武时耀亭王振国张宏军何英进韩艳刘献宝谢强李培东
Owner 东营市科诺石油技术有限责任公司
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