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Rectorite saturated brine drilling fluid for drilling under rock salt deep stratum

A brine drilling fluid and rectorite technology, applied in the field of rectorite saturated brine drilling fluid, can solve the problems of rheological performance deterioration, drilling fluid rheological performance deterioration, poor sand return, etc., and achieve high temperature resistance The effect of good, good sand-carrying ability, good sand-carrying performance

Inactive Publication Date: 2010-12-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, when using ordinary water-based drilling fluids to drill into salt formations, the following main technical problems will be encountered: ① ordinary drilling fluids will dissolve rock salt formations, resulting in expansion of well diameter and the formation of pot-bellied holes, resulting in unqualified cementing quality; ② After the rock salt layer is dissolved by the drilling fluid, the calcium and magnesium ions in it enter the drilling fluid, causing "salt intrusion" and "calcium intrusion", which rapidly deteriorates the rheological properties of the drilling fluid, which may cause a rapid increase in water loss. Performance deterioration and other problems lead to accidents such as obstruction in drilling, poor sand return, inability to judge formation conditions, drill stuck, buried drill, diameter shrinkage, etc.

Method used

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  • Rectorite saturated brine drilling fluid for drilling under rock salt deep stratum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the drilling fluid of the present embodiment, each component and the mass volume ratio (unit: Kg / m3) of the drilling fluid and the drilling fluid 3 ) are: 4% sodium-based rectorite, 14% binary copolymer PAMS601, 0.1% sodium carboxymethyl starch (CMS), 0.1% coating agent FA367, 0.2% sulfonated asphalt powder FT-1, 2.5% Broad-spectrum wall protection agent GSP, 3% solid lubricant RH-2 for drilling fluid, 1% lubricant CNS for drilling fluid, 0.1% silicone oil, 0.1% NaOH, the rest is NaCl and water, of which NaCl is saturated.

[0029] According to the above ratio, mix sodium-based rectorite with water, stir evenly to obtain sodium-based rectorite slurry, then add various other additives and stir, add NaCl to fully dissolve and make NaCl saturated in the drilling fluid, mix After uniformity, the rectorite-saturated brine drilling fluid used for drilling in the rock-salt deep formation can be obtained.

[0030] The performance index (executive standard GB / T 16783-1997) o...

Embodiment 2

[0032] In the drilling fluid of the present embodiment, each component and the mass volume ratio (unit: Kg / m3) of the drilling fluid and the drilling fluid 3 ) are: 8% sodium-based rectorite, 0.5% polymer fluid loss control agent COP-LFL, 2.5% binary copolymer PAMS900, 4% polyacrylamide (PAM), 0.1% coating agent KPAM, 0.5% Coating agent PAC141, 1% broad-spectrum wall protection agent GSP, 1% drilling fluid lubricant TNH-2, 0.5% defoamer, 0.5% NaOH, the rest is NaCl and water, of which NaCl is saturated.

[0033] According to the above proportions, the same method as in Example 1 was used to prepare, and the rectorite-saturated brine drilling fluid for drilling in deep formations of rock salt was obtained.

[0034] The performance index of the drilling fluid prepared in this example (implementation standard GB / T 16783-1997): the density is 1.20g / cm 3 , the viscosity is 53s, and the medium pressure filtration loss at room temperature is FL API 4.8mL, high temperature and high ...

Embodiment 3

[0036] In the drilling fluid of the present embodiment, each component and the mass volume ratio (unit: Kg / m3) of the drilling fluid and the drilling fluid 3 ) are: 1% sodium-based rectorite, 0.2% polymer fluid loss reducer COP-LFL, 5% HV-CMC, 1% coating agent KPAM, 0.5% sulfonated asphalt powder FT-1, 5% drilling Liquid lubricant CNS, 0.3% defoamer, 0.2% NaOH, the rest is NaCl and water, of which NaCl is saturated.

[0037] According to the above proportions, the same method as in Example 1 was used to prepare, and the rectorite-saturated brine drilling fluid for drilling in deep formations of rock salt was obtained.

[0038] The performance index of the drilling fluid prepared in this example (implementation standard GB / T 16783-1997): the density is 1.20g / cm 3 , the viscosity is 51s, and the medium pressure filtration loss at room temperature is FL API 4.7mL, high temperature and high pressure filtration loss FL hthp is 13.8mL, plastic viscosity PV is 23mPa·S, dynamic she...

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Abstract

The invention discloses a rectorite saturated brine drilling fluid for drilling under a rock salt deep stratum and belongs to the technical field of drilling and oil exploitation. The drilling fluid is prepared from an auxiliary agent, NaCl and water according to a certain proportion, wherein the auxiliary agent at least comprises 1 to 8 percent of sodium base rectorite, 0.2 to 14 percent of main fluid loss agent, 0.1 to 5 percent of auxiliary fluid loss agent, 0.1 to 1 percent of coating agent, 1 to 5 percent of wall protective agent, 1 to 5 percent of lubricant, 0.1 to 0.5 percent of antifoaming agent and 0.1 to 0.5 percent of NaOH, wherein the NaCl is in a saturated state in the drilling fluid. The drilling fluid of the invention can still keep good rheological property, prop-carrying capacity and filtration property resistance at the highest temperature of 200 DEG C, can quickly and safely drill in a salt layer, guarantees the smooth drilling operation under the deep stratum salt layer and is particularly suitable for drilling under the rock salt deep stratum and extracting rock cores.

Description

technical field [0001] The invention relates to a rectorite-saturated brine drilling fluid used for drilling in deep rock-salt formations, belonging to the technical fields of drilling and oil exploitation. Background technique [0002] Drilling fluid plays a very important role in the field of drilling and drilling engineering technology. The performance and quality of drilling fluid play a key role in the success of drilling and oil extraction. Due to the rapid development of modern industry and the rapid improvement of people's living standards, it has become more and more difficult to meet the needs of people's production and life by only using mineral resources in relatively shallow strata and easily exploitable strata. With the rapid development of drilling level, people have gradually begun to focus on the rich mineral resources in deep strata, and seeking resources from deep strata, especially oil and gas resources, has become a major trend in the world's mineral min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14C09K8/20C09K8/24
Inventor 靳洪允侯书恩闵浩潘勇肖红艳
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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