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Anti-salt high-density early-strength anti-channeling oil well cement slurry

A technology of oil well cement slurry and oil well cement, applied in the field of oil well cement slurry, can solve the problems of affecting the comprehensive performance of cement slurry, unreasonable particle matching, slow strength of cement stone, etc., achieve good settlement stability, good flow performance, prevent The effect of the ring

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers mainly use barite, iron ore powder, etc. as cement weighting agents. However, the use of lower density weighting materials has disadvantages such as large dosage, unreasonable particle matching, and slow strength of cement stone.
In addition, general cement slurry admixtures, such as fluid loss reducers, dispersants, retarders, etc., are not strong in salt resistance, which will seriously affect the comprehensive performance of cement slurry

Method used

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  • Anti-salt high-density early-strength anti-channeling oil well cement slurry
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  • Anti-salt high-density early-strength anti-channeling oil well cement slurry

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Experimental program
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Effect test

Embodiment 1

[0022] The formula of oil well cement slurry A is:

[0023] 100 parts of G grade oil well cement; 67 parts of iron ore powder, its density is 6.0g / cm 3 , consisting of 22 parts of iron ore powder with a particle size of 150 μm and 45 parts of iron ore powder with a particle size of 60 μm; 8 parts of superfine cement; 5 parts of micro silicon; 5 parts of manganese ore powder; 3 parts of expansion agent; 6 parts of anti-channeling agent; 2.5 parts of dispersant; 40 parts of NaCl solution of 0.5 part of defoaming agent and 15.3wt%; After weighing the above-mentioned components by weight, mix them uniformly under Waring mixer to obtain Oil well cement slurry A.

Embodiment 2

[0025] The formula of oil well cement slurry B is:

[0026] 100 parts of G grade oil well cement; 85 parts of iron ore powder, its density is 7.0g / cm 3 , consisting of 21 parts of iron ore powder with a particle size of 150 μm and 64 parts of iron ore powder with a particle size of 45 μm; 10 parts of superfine cement; 6 parts of micro silicon; 4 parts of manganese ore powder; 5 parts of expansion agent; 8 parts of anti-channeling agent; 3 parts of dispersant, 0.5 part of defoamer and 39 parts of semi-saturated brine; after weighing the above-mentioned components according to the parts by weight, mix them uniformly under the Waring mixer to obtain oil well cement Pulp B.

Embodiment 3

[0028] The formula of oil well cement slurry C is:

[0029] 100 parts of G grade oil well cement; 130 parts of iron ore powder, the density of which is 7.0g / cm 3 , consisting of 40 parts of iron ore powder with particle size of 150 μm and 90 parts of particle size of 45 μm; 12 parts of superfine cement; 6 parts of micro silicon; 10 parts of manganese ore powder; 5 parts of expansion agent; 8 parts of anti-channeling agent; 4 parts of dispersant; 0.6 part of defoamer; 42 parts of semi-saturated brine; after weighing the above-mentioned components according to the number of parts by weight, mix them uniformly under the Waring mixer to obtain oil well cement Pulp C.

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Abstract

The invention discloses anti-salt high-density early-strength anti-channeling oil well cement slurry. The cement slurry includes oil well cement, iron ore powder, ultrafine cement, micro-silicon, manganese ore powder, and a styrene-butadiene latex anti-channeling agent, which are mixed according to certain ratio. The six components, in a manner of grain composition, are subjected to ratio optimization in density and granular size, wherein a high-anti-salt additive having cooperative performances is added to the components, so that the mixed cement slurry has stable main body performance and has excellent settlement stability. The components are mixed uniformly with semi-saturated salt water to form the cement slurry which is low in free water content and has good flowability, is micro-expansive and early-strength and has strong anti-channeling performance. Channel of oil gas and water due to annulus phenomenon caused by shrinkage of cement slurry can be prevented during hardening process of the cement slurry. The set cement slurry reaches 14 MPa in strength within 24 h, so that cementing time is shortened and furthermore well drilling period is reduced.

Description

technical field [0001] The invention relates to the technical field of oil well cement slurry, in particular to a salt-resistant high-density early-strength anti-channeling oil well cement slurry. Background technique [0002] With the continuous deepening of oil and gas exploration and development, there are more and more wells with high pressure, salt-gypsum layer and easy channeling. At present, when PetroChina develops the Missan block in Iraq, it encounters high-pressure salt-gypsum layers that are prone to well channeling. For cementing operations in high-pressure channeling salt-gypsum formations, high-density anti-channeling cement slurry is required, and the density of cement slurry required for some wells in the Missan block reaches 2.5g / cm 3 Above, the brine is half-saturated, and the cement stone is required to exceed 14MPa in 24 hours. At present, researchers mainly use barite, iron ore powder, etc. as cement weighting agents. However, the use of lower density...

Claims

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Application Information

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IPC IPC(8): C09K8/48C09K8/487C09K8/467C09K8/493C04B28/00
CPCC04B28/00C04B2111/00724C04B2201/20C04B2201/50C09K8/467C09K8/48C09K8/487C09K8/493C04B18/12C04B18/146C04B24/2676
Inventor 齐奔付家文孙勤亮刘文明于倩倩杜滨高雪晴林志辉
Owner BC P INC CHINA NAT PETROLEUM CORP